操作系统开发

开发平台：

WINDOWS

COMPLETE.T：源码内容

31386
31387 flgs = 0;
31388
31389 /* XTABS - if OPOST and XTABS */
31390 if ((tp->tty_termios.c_oflag & (OPOST|XTABS)) == (OPOST|XTABS))
31391 flgs |= 0006000;
31392
31393 /* BITS5..BITS8 - map directly to CS5..CS8 */
31394 flgs |= (tp->tty_termios.c_cflag & CSIZE) << (8-2);
31395
31396 /* EVENP - if PARENB and not PARODD */
31397 if ((tp->tty_termios.c_cflag & (PARENB|PARODD)) == PARENB)
31398 flgs |= 0000200;
31399
31400 /* ODDP - if PARENB and PARODD */
31401 if ((tp->tty_termios.c_cflag & (PARENB|PARODD)) == (PARENB|PARODD))
31402 flgs |= 0000100;
31403
31404 /* RAW - if not ICANON and not ISIG */
31405 if (!(tp->tty_termios.c_lflag & (ICANON|ISIG)))
31406 flgs |= 0000040;
31407
31408 /* CRMOD - if ICRNL */
31409 if (tp->tty_termios.c_iflag & ICRNL)
31410 flgs |= 0000020;
31411
31412 /* ECHO - if ECHO */
31413 if (tp->tty_termios.c_lflag & ECHO)
31414 flgs |= 0000010;
31415
31416 /* CBREAK - if not ICANON and ISIG */
31417 if ((tp->tty_termios.c_lflag & (ICANON|ISIG)) == ISIG)
31418 flgs |= 0000002;
31419
.Ep 442 src/kernel/tty.c
31420 sg->sg_flags = flgs;
31421 return(OK);
31422 }
31425 /*===========================================================================*
31426 * compat_getc *
31427 *===========================================================================*/
31428 PRIVATE int compat_getc(tp, tc)
31429 tty_t *tp;
31430 struct tchars *tc;
31431 {
31432 /* Translate an old TIOCGETC to the termios equivalent. */
31433
31434 tc->t_intrc = tp->tty_termios.c_cc[VINTR];
31435 tc->t_quitc = tp->tty_termios.c_cc[VQUIT];
31436 tc->t_startc = tp->tty_termios.c_cc[VSTART];
31437 tc->t_stopc = tp->tty_termios.c_cc[VSTOP];
31438 tc->t_brkc = tp->tty_termios.c_cc[VEOL];
31439 tc->t_eofc = tp->tty_termios.c_cc[VEOF];
31440 return(OK);
31441 }
31444 /*===========================================================================*
31445 * compat_setp *
31446 *===========================================================================*/
31447 PRIVATE int compat_setp(tp, sg)
31448 tty_t *tp;
31449 struct sgttyb *sg;
31450 {
31451 /* Translate an old TIOCSETP to the termios equivalent. */
31452 struct termios termios;
31453 int flags;
31454
31455 termios = tp->tty_termios;
31456
31457 termios.c_cc[VERASE] = sg->sg_erase;
31458 termios.c_cc[VKILL] = sg->sg_kill;
31459 cfsetispeed(&termios, sgspd2tspd(sg->sg_ispeed & BYTE));
31460 cfsetospeed(&termios, sgspd2tspd(sg->sg_ospeed & BYTE));
31461 flags = sg->sg_flags;
31462
31463 /* Input flags */
31464
31465 /* BRKINT - not changed */
31466 /* ICRNL - set if CRMOD is set and not RAW */
31467 /* (CRMOD also controls output) */
31468 termios.c_iflag &= ~ICRNL;
31469 if ((flags & 0000020) && !(flags & 0000040))
31470 termios.c_iflag |= ICRNL;
31471
31472 /* IGNBRK - not changed */
31473 /* IGNCR - forced off (ignoring cr's is not supported) */
31474 termios.c_iflag &= ~IGNCR;
31475
31476 /* IGNPAR - not changed */
31477 /* INLCR - forced off (mapping nl's to cr's is not supported) */
31478 termios.c_iflag &= ~INLCR;
31479
.Op 443 src/kernel/tty.c
31480 /* INPCK - not changed */
31481 /* ISTRIP - not changed */
31482 /* IXOFF - not changed */
31483 /* IXON - forced on if not RAW */
31484 termios.c_iflag &= ~IXON;
31485 if (!(flags & 0000040))
31486 termios.c_iflag |= IXON;
31487
31488 /* PARMRK - not changed */
31489
31490 /* Output flags */
31491
31492 /* OPOST - forced on if not RAW */
31493 termios.c_oflag &= ~OPOST;
31494 if (!(flags & 0000040))
31495 termios.c_oflag |= OPOST;
31496
31497 /* ONLCR - forced on if CRMOD */
31498 termios.c_oflag &= ~ONLCR;
31499 if (flags & 0000020)
31500 termios.c_oflag |= ONLCR;
31501
31502 /* XTABS - forced on if XTABS */
31503 termios.c_oflag &= ~XTABS;
31504 if (flags & 0006000)
31505 termios.c_oflag |= XTABS;
31506
31507 /* CLOCAL - not changed */
31508 /* CREAD - forced on (receiver is always enabled) */
31509 termios.c_cflag |= CREAD;
31510
31511 /* CSIZE - CS5-CS8 correspond directly to BITS5-BITS8 */
31512 termios.c_cflag = (termios.c_cflag & ~CSIZE) | ((flags & 0001400) >> (8-2));
31513
31514 /* CSTOPB - not changed */
31515 /* HUPCL - not changed */
31516 /* PARENB - set if EVENP or ODDP is set */
31517 termios.c_cflag &= ~PARENB;
31518 if (flags & (0000200|0000100))
31519 termios.c_cflag |= PARENB;
31520
31521 /* PARODD - set if ODDP is set */
31522 termios.c_cflag &= ~PARODD;
31523 if (flags & 0000100)
31524 termios.c_cflag |= PARODD;
31525
31526 /* Local flags */
31527
31528 /* ECHO - set if ECHO is set */
31529 termios.c_lflag &= ~ECHO;
31530 if (flags & 0000010)
31531 termios.c_lflag |= ECHO;
31532
31533 /* ECHOE - not changed */
31534 /* ECHOK - not changed */
31535 /* ECHONL - not changed */
31536 /* ICANON - set if neither CBREAK nor RAW */
31537 termios.c_lflag &= ~ICANON;
31538 if (!(flags & (0000002|0000040)))
31539 termios.c_lflag |= ICANON;
.Ep 444 src/kernel/tty.c
31540
31541 /* IEXTEN - set if not RAW */
31542 /* ISIG - set if not RAW */
31543 termios.c_lflag &= ~(IEXTEN|ISIG);
31544 if (!(flags & 0000040))
31545 termios.c_lflag |= (IEXTEN|ISIG);
31546
31547 /* NOFLSH - not changed */
31548 /* TOSTOP - not changed */
31549
31550 tp->tty_termios = termios;
31551 setattr(tp);
31552 return(OK);
31553 }
31556 /*===========================================================================*
31557 * compat_setc *
31558 *===========================================================================*/
31559 PRIVATE int compat_setc(tp, tc)
31560 tty_t *tp;
31561 struct tchars *tc;
31562 {
31563 /* Translate an old TIOCSETC to the termios equivalent. */
31564 struct termios termios;
31565
31566 termios = tp->tty_termios;
31567
31568 termios.c_cc[VINTR] = tc->t_intrc;
31569 termios.c_cc[VQUIT] = tc->t_quitc;
31570 termios.c_cc[VSTART] = tc->t_startc;
31571 termios.c_cc[VSTOP] = tc->t_stopc;
31572 termios.c_cc[VEOL] = tc->t_brkc;
31573 termios.c_cc[VEOF] = tc->t_eofc;
31574
31575 tp->tty_termios = termios;
31576 setattr(tp);
31577 return(OK);
31578 }
31581 /* Table of termios line speed to sgtty line speed translations. All termios
31582 * speeds are present even if sgtty didn't know about them. (Now it does.)
31583 */
31584 PRIVATE struct s2s {
31585 speed_t tspd;
31586 u8_t sgspd;
31587 } ts2sgs[] = {
31588 { B0, 0 },
31589 { B50, 50 },
31590 { B75, 75 },
31591 { B110, 1 },
31592 { B134, 134 },
31593 { B200, 2 },
31594 { B300, 3 },
31595 { B600, 6 },
31596 { B1200, 12 },
31597 { B1800, 18 },
31598 { B2400, 24 },
31599 { B4800, 48 },
.Op 445 src/kernel/tty.c
31600 { B9600, 96 },
31601 { B19200, 192 },
31602 { B38400, 195 },
31603 { B57600, 194 },
31604 { B115200, 193 },
31605 };
31606
31607 /*===========================================================================*
31608 * tspd2sgspd *
31609 *===========================================================================*/
31610 PRIVATE int tspd2sgspd(tspd)
31611 speed_t tspd;
31612 {
31613 /* Translate a termios speed to sgtty speed. */
31614 struct s2s *s;
31615
31616 for (s = ts2sgs; s < ts2sgs + sizeof(ts2sgs)/sizeof(ts2sgs[0]); s++) {
31617 if (s->tspd == tspd) return(s->sgspd);
31618 }
31619 return 96;
31620 }
31623 /*===========================================================================*
31624 * sgspd2tspd *
31625 *===========================================================================*/
31626 PRIVATE speed_t sgspd2tspd(sgspd)
31627 int sgspd;
31628 {
31629 /* Translate a sgtty speed to termios speed. */
31630 struct s2s *s;
31631
31632 for (s = ts2sgs; s < ts2sgs + sizeof(ts2sgs)/sizeof(ts2sgs[0]); s++) {
31633 if (s->sgspd == sgspd) return(s->tspd);
31634 }
31635 return B9600;
31636 }
31639 #if ENABLE_BINCOMPAT
31640 /*===========================================================================*
31641 * do_ioctl_compat *
31642 *===========================================================================*/
31643 PRIVATE void do_ioctl_compat(tp, m_ptr)
31644 tty_t *tp;
31645 message *m_ptr;
31646 {
31647 /* Handle the old sgtty ioctl's that packed the sgtty or tchars struct into
31648 * the Minix message. Efficient then, troublesome now.
31649 */
31650 int minor, proc, func, result, r;
31651 long flags, erki, spek;
31652 u8_t erase, kill, intr, quit, xon, xoff, brk, eof, ispeed, ospeed;
31653 struct sgttyb sg;
31654 struct tchars tc;
31655 message reply_mess;
31656
31657 minor = m_ptr->TTY_LINE;
31658 proc = m_ptr->PROC_NR;
31659 func = m_ptr->REQUEST;
.Ep 446 src/kernel/tty.c
31660 spek = m_ptr->m2_l1;
31661 flags = m_ptr->m2_l2;
31662
31663 switch(func)
31664 {
31665 case (('t'<<8) | 8): /* TIOCGETP */
31666 r = compat_getp(tp, &sg);
31667 erase = sg.sg_erase;
31668 kill = sg.sg_kill;
31669 ispeed = sg.sg_ispeed;
31670 ospeed = sg.sg_ospeed;
31671 flags = sg.sg_flags;
31672 erki = ((long)ospeed<<24) | ((long)ispeed<<16) | ((long)erase<<8) |kill;
31673 break;
31674 case (('t'<<8) | 18): /* TIOCGETC */
31675 r = compat_getc(tp, &tc);
31676 intr = tc.t_intrc;
31677 quit = tc.t_quitc;
31678 xon = tc.t_startc;
31679 xoff = tc.t_stopc;
31680 brk = tc.t_brkc;
31681 eof = tc.t_eofc;
31682 erki = ((long)intr<<24) | ((long)quit<<16) | ((long)xon<<8) | xoff;
31683 flags = (eof << 8) | brk;
31684 break;
31685 case (('t'<<8) | 17): /* TIOCSETC */
31686 tc.t_stopc = (spek >> 0) & 0xFF;
31687 tc.t_startc = (spek >> 8) & 0xFF;
31688 tc.t_quitc = (spek >> 16) & 0xFF;
31689 tc.t_intrc = (spek >> 24) & 0xFF;
31690 tc.t_brkc = (flags >> 0) & 0xFF;
31691 tc.t_eofc = (flags >> 8) & 0xFF;
31692 r = compat_setc(tp, &tc);
31693 break;
31694 case (('t'<<8) | 9): /* TIOCSETP */
31695 sg.sg_erase = (spek >> 8) & 0xFF;
31696 sg.sg_kill = (spek >> 0) & 0xFF;
31697 sg.sg_ispeed = (spek >> 16) & 0xFF;
31698 sg.sg_ospeed = (spek >> 24) & 0xFF;
31699 sg.sg_flags = flags;
31700 r = compat_setp(tp, &sg);
31701 break;
31702 default:
31703 r = ENOTTY;
31704 }
31705 reply_mess.m_type = TASK_REPLY;
31706 reply_mess.REP_PROC_NR = m_ptr->PROC_NR;
31707 reply_mess.REP_STATUS = r;
31708 reply_mess.m2_l1 = erki;
31709 reply_mess.m2_l2 = flags;
31710 send(m_ptr->m_source, &reply_mess);
31711 }
31712 #endif /* ENABLE_BINCOMPAT */
31713 #endif /* ENABLE_SRCCOMPAT || ENABLE_BINCOMPAT */
31714
31715
31716
.Op 447 src/kernel/wdeth.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/kernel/wdeth.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
31800 /*
31801 wdeth.c
31802
31803 Created: March 14, 1994 by Philip Homburg
31804 */
31805
31806 #include "kernel.h"
31807 #include <net/gen/ether.h>
31808 #include <net/gen/eth_io.h>
31809 #include "assert.h"
31810 INIT_ASSERT
31811 #include "dp8390.h"
31812 #include "wdeth.h"
31813
31814 #if ENABLE_NETWORKING
31815
31816 #if !__minix_vmd
31817 #define debug 0
31818 #endif
31819
31820 #define WET_ETHERNET 0x01 /* Ethernet transceiver */
31821 #define WET_STARLAN 0x02 /* Starlan transceiver */
31822 #define WET_INTERF_CHIP 0x04 /* has a WD83C583 interface chip */
31823 #define WET_BRD_16BIT 0x08 /* 16 bit board */
31824 #define WET_SLT_16BIT 0x10 /* 16 bit slot */
31825 #define WET_790 0x20 /* '790 chip */
31826
31827 static int we_int_table[8]= { 9, 3, 5, 7, 10, 11, 15, 4 };
31828 static int we_790int_table[8]= { 0, 9, 3, 5, 7, 10, 11, 15 };
31829
31830 _PROTOTYPE( static void we_init, (dpeth_t *dep) );
31831 _PROTOTYPE( static void we_stop, (dpeth_t *dep) );
31832 _PROTOTYPE( static int we_aliasing, (dpeth_t *dep) );
31833 _PROTOTYPE( static int we_interface_chip, (dpeth_t *dep) );
31834 _PROTOTYPE( static int we_16bitboard, (dpeth_t *dep) );
31835 _PROTOTYPE( static int we_16bitslot, (dpeth_t *dep) );
31836 _PROTOTYPE( static int we_ultra, (dpeth_t *dep) );
31837
31838 /*===========================================================================*
31839 * wdeth_probe *
31840 *===========================================================================*/
31841 int wdeth_probe(dep)
31842 dpeth_t *dep;
31843 {
31844 int sum;
31845
31846 if (dep->de_linmem == 0)
31847 return 0; /* No shared memory, so no WD board */
31848
31849 sum = inb_we(dep, EPL_EA0) + inb_we(dep, EPL_EA1) +
31850 inb_we(dep, EPL_EA2) + inb_we(dep, EPL_EA3) +
31851 inb_we(dep, EPL_EA4) + inb_we(dep, EPL_EA5) +
31852 inb_we(dep, EPL_TLB) + inb_we(dep, EPL_CHKSUM);
31853 if ((sum & 0xFF) != 0xFF)
31854 return 0; /* No ethernet board at this address */
.Ep 448 src/kernel/wdeth.c
31855
31856 dep->de_initf= we_init;
31857 dep->de_stopf= we_stop;
31858 dep->de_prog_IO= 0;
31859 return 1;
31860 }
31863 /*===========================================================================*
31864 * we_init *
31865 *===========================================================================*/
31866 static void we_init(dep)
31867 dpeth_t *dep;
31868 {
31869 int i, int_indx, int_nr;
31870 int tlb, rambit, revision;
31871 int icr, irr, hwr, b, gcr;
31872 int we_type;
31873 int sendq_nr;
31874
31875 assert(dep->de_mode == DEM_ENABLED);
31876 assert(!(dep->de_flags & DEF_ENABLED));
31877
31878 dep->de_address.ea_addr[0] = inb_we(dep, EPL_EA0);
31879 dep->de_address.ea_addr[1] = inb_we(dep, EPL_EA1);
31880 dep->de_address.ea_addr[2] = inb_we(dep, EPL_EA2);
31881 dep->de_address.ea_addr[3] = inb_we(dep, EPL_EA3);
31882 dep->de_address.ea_addr[4] = inb_we(dep, EPL_EA4);
31883 dep->de_address.ea_addr[5] = inb_we(dep, EPL_EA5);
31884
31885 dep->de_dp8390_port= dep->de_base_port + EPL_DP8390;
31886
31887 dep->de_16bit= 0;
31888
31889 we_type= 0;
31890 we_type |= WET_ETHERNET; /* assume ethernet */
31891 if (we_ultra(dep))
31892 we_type |= WET_790;
31893 if (!we_aliasing(dep))
31894 {
31895 if (we_interface_chip(dep))
31896 we_type |= WET_INTERF_CHIP;
31897 if (we_16bitboard(dep))
31898 {
31899 we_type |= WET_BRD_16BIT;
31900 if (we_16bitslot(dep))
31901 we_type |= WET_SLT_16BIT;
31902 }
31903 }
31904 if (we_type & WET_SLT_16BIT)
31905 dep->de_16bit= 1;
31906
31907 /* look at the on board ram size. */
31908 tlb= inb_we(dep, EPL_TLB);
31909 revision= tlb & E_TLB_REV;
31910 rambit= tlb & E_TLB_RAM;
31911
31912 if (revision < 2)
31913 {
31914 dep->de_ramsize= 0x2000; /* 8K */
.Op 449 src/kernel/wdeth.c
31915 if (we_type & WET_BRD_16BIT)
31916 dep->de_ramsize= 0x4000; /* 16K */
31917 else if ((we_type & WET_INTERF_CHIP) &&
31918 inb_we(dep, EPL_ICR) & E_ICR_MEMBIT)
31919 {
31920 dep->de_ramsize= 0x8000; /* 32K */
31921 }
31922 }
31923 else
31924 {
31925 if (we_type & WET_BRD_16BIT)
31926 {
31927 /* 32K or 16K */
31928 dep->de_ramsize= rambit ? 0x8000 : 0x4000;
31929 }
31930 else
31931 {
31932 /* 32K or 8K */
31933 dep->de_ramsize= rambit ? 0x8000 : 0x2000;
31934 }
31935 }
31936
31937 if (we_type & WET_790)
31938 {
31939 outb_we(dep, EPL_MSR, E_MSR_RESET);
31940 if ((we_type & (WET_BRD_16BIT|WET_SLT_16BIT)) ==
31941 (WET_BRD_16BIT|WET_SLT_16BIT))
31942 {
31943 outb_we(dep, EPL_LAAR, E_LAAR_LAN16E | E_LAAR_MEM16E);
31944 }
31945 }
31946 else if (we_type & WET_BRD_16BIT)
31947 {
31948 if (we_type & WET_SLT_16BIT)
31949 {
31950 outb_we(dep, EPL_LAAR, E_LAAR_A19 | E_LAAR_SOFTINT |
31951 E_LAAR_LAN16E | E_LAAR_MEM16E);
31952 }
31953 else
31954 {
31955 outb_we(dep, EPL_LAAR, E_LAAR_A19 | E_LAAR_SOFTINT |
31956 E_LAAR_LAN16E);
31957 }
31958 }
31959
31960 if (we_type & WET_790)
31961 {
31962 outb_we(dep, EPL_MSR, E_MSR_MENABLE);
31963 hwr= inb_we(dep, EPL_790_HWR);
31964 outb_we(dep, EPL_790_HWR, hwr | E_790_HWR_SWH);
31965 b= inb_we(dep, EPL_790_B);
31966 outb_we(dep, EPL_790_B, ((dep->de_linmem >> 13) & 0x0f) |
31967 ((dep->de_linmem >> 11) & 0x40) | (b & 0xb0));
31968 outb_we(dep, EPL_790_HWR, hwr & ~E_790_HWR_SWH);
31969 }
31970 else
31971 {
31972 outb_we(dep, EPL_MSR, E_MSR_RESET);
31973 outb_we(dep, EPL_MSR, E_MSR_MENABLE |
31974 ((dep->de_linmem >> 13) & E_MSR_MEMADDR));
.Ep 450 src/kernel/wdeth.c
31975 }
31976
31977 if ((we_type & WET_INTERF_CHIP) && !(we_type & WET_790))
31978 {
31979 icr= inb_we(dep, EPL_ICR);
31980 irr= inb_we(dep, EPL_IRR);
31981 int_indx= (icr & E_ICR_IR2) |
31982 ((irr & (E_IRR_IR0|E_IRR_IR1)) >> 5);
31983 int_nr= we_int_table[int_indx];
31984 #if DEBUG
31985 { printf("wdeth.c: encoded irq= %dn", int_nr); }
31986 #endif
31987 if (dep->de_irq & DEI_DEFAULT) dep->de_irq= int_nr;
31988
31989 outb_we(dep, EPL_IRR, irr | E_IRR_IEN);
31990 }
31991 if (we_type & WET_790)
31992 {
31993 hwr= inb_we(dep, EPL_790_HWR);
31994 outb_we(dep, EPL_790_HWR, hwr | E_790_HWR_SWH);
31995
31996 gcr= inb_we(dep, EPL_790_GCR);
31997
31998 outb_we(dep, EPL_790_HWR, hwr & ~E_790_HWR_SWH);
31999
32000 int_indx= ((gcr & E_790_GCR_IR2) >> 4) |
32001 ((gcr & (E_790_GCR_IR1|E_790_GCR_IR0)) >> 2);
32002 int_nr= we_790int_table[int_indx];
32003 #if DEBUG
32004 { printf("wdeth.c: encoded irq= %dn", int_nr); }
32005 #endif
32006 if (dep->de_irq & DEI_DEFAULT) dep->de_irq= int_nr;
32007
32008 icr= inb_we(dep, EPL_790_ICR);
32009 outb_we(dep, EPL_790_ICR, icr | E_790_ICR_EIL);
32010 }
32011
32012 /* Strip the "default flag." */
32013 dep->de_irq &= ~DEI_DEFAULT;
32014
32015 if (!debug)
32016 {
32017 printf("wdeth: WD80%d3 at %X:%d:%lXn",
32018 we_type & WET_BRD_16BIT ? 1 : 0,
32019 dep->de_base_port, dep->de_irq, dep->de_linmem);
32020 }
32021 else
32022 {
32023 printf("wdeth: Western Digital %s%s card %s%s",
32024 we_type & WET_BRD_16BIT ? "16-bit " : "",
32025 we_type & WET_ETHERNET ? "Ethernet" :
32026 we_type & WET_STARLAN ? "Starlan" : "Network",
32027 we_type & WET_INTERF_CHIP ? "with an interface chip " : "",
32028 we_type & WET_SLT_16BIT ? "in a 16-bit slot " : "");
32029 printf(
32030 "at I/O address 0x%X, memory address 0x%lX, memory size 0x%X, irq %dn",
32031 dep->de_base_port, dep->de_linmem, dep->de_ramsize,
32032 dep->de_irq);
32033 }
32034
.Op 451 src/kernel/wdeth.c
32035 dep->de_offset_page= 0; /* Shared memory starts at 0 */
32036
32037 /* Allocate one send buffer (1.5KB) per 8KB of on board memory. */
32038 sendq_nr= dep->de_ramsize / 0x2000;
32039 if (sendq_nr < 1)
32040 sendq_nr= 1;
32041 else if (sendq_nr > SENDQ_NR)
32042 sendq_nr= SENDQ_NR;
32043 dep->de_sendq_nr= sendq_nr;
32044 for (i= 0; i<sendq_nr; i++)
32045 dep->de_sendq[i].sq_sendpage= i*SENDQ_PAGES;
32046
32047 dep->de_startpage= i*SENDQ_PAGES;
32048 dep->de_stoppage= dep->de_ramsize / DP_PAGESIZE;
32049 }
32052 /*===========================================================================*
32053 * we_stop *
32054 *===========================================================================*/
32055 static void we_stop(dep)
32056 dpeth_t *dep;
32057 {
32058 if (dep->de_16bit)
32059 outb_we(dep, EPL_LAAR, E_LAAR_A19 | E_LAAR_LAN16E);
32060 outb_we(dep, EPL_MSR, E_MSR_RESET);
32061 outb_we(dep, EPL_MSR, 0);
32062 }
32065 /*===========================================================================*
32066 * we_aliasing *
32067 *===========================================================================*/
32068 static int we_aliasing(dep)
32069 dpeth_t *dep;
32070 {
32071 /* Determine whether wd8003 hardware performs register aliasing. This implies
32072 * an old WD8003E board. */
32073
32074 if (inb_we(dep, EPL_REG1) != inb_we(dep, EPL_EA1))
32075 return 0;
32076 if (inb_we(dep, EPL_REG2) != inb_we(dep, EPL_EA2))
32077 return 0;
32078 if (inb_we(dep, EPL_REG3) != inb_we(dep, EPL_EA3))
32079 return 0;
32080 if (inb_we(dep, EPL_REG4) != inb_we(dep, EPL_EA4))
32081 return 0;
32082 if (inb_we(dep, EPL_REG7) != inb_we(dep, EPL_CHKSUM))
32083 return 0;
32084 return 1;
32085 }
32088 /*===========================================================================*
32089 * we_interface_chip *
32090 *===========================================================================*/
32091 static int we_interface_chip(dep)
32092 dpeth_t *dep;
32093 {
32094 /* Determine if the board has an interface chip. */
.Ep 452 src/kernel/wdeth.c
32095
32096 outb_we(dep, EPL_GP2, 0x35);
32097 if (inb_we(dep, EPL_GP2) != 0x35)
32098 return 0;
32099 outb_we(dep, EPL_GP2, 0x3A);
32100 if (inb_we(dep, EPL_GP2) != 0x3A)
32101 return 0;
32102 return 1;
32103 }
32106 /*===========================================================================*
32107 * we_16bitboard *
32108 *===========================================================================*/
32109 static int we_16bitboard(dep)
32110 dpeth_t *dep;
32111 {
32112 /* Determine whether the board is capable of doing 16 bit memory moves.
32113 * If the 16 bit enable bit is unchangable by software we'll assume an
32114 * 8 bit board.
32115 */
32116 int icr;
32117 u8_t tlb;
32118
32119 icr= inb_we(dep, EPL_ICR);
32120
32121 outb_we(dep, EPL_ICR, icr ^ E_ICR_16BIT);
32122 if (inb_we(dep, EPL_ICR) == icr)
32123 {
32124 tlb= inb_we(dep, EPL_TLB);
32125 #if DEBUG
32126 printf("wdeth: tlb= 0x%xn", tlb);
32127 #endif
32128 return tlb == E_TLB_EB || tlb == E_TLB_E ||
32129 tlb == E_TLB_SMCE || tlb == E_TLB_SMC8216C;
32130 }
32131 outb_we(dep, EPL_ICR, icr);
32132 return 1;
32133 }
32136 /*===========================================================================*
32137 * we_16bitslot *
32138 *===========================================================================*/
32139 static int we_16bitslot(dep)
32140 dpeth_t *dep;
32141 {
32142 /* Determine if the 16 bit board in plugged into a 16 bit slot. */
32143 return !!(inb_we(dep, EPL_ICR) & E_ICR_16BIT);
32144 }
32147 /*===========================================================================*
32148 * we_ultra *
32149 *===========================================================================*/
32150 static int we_ultra(dep)
32151 dpeth_t *dep;
32152 {
32153 /* Determine if we has an '790 chip. */
32154 u8_t tlb;
.Op 453 src/kernel/wdeth.c
32155
32156 tlb= inb_we(dep, EPL_TLB);
32157 return tlb == E_TLB_SMC8216C;
32158 }
32160 #endif /* ENABLE_NETWORKING */
32161
32162 /*
32163 * $PchHeader: /mount/hd2/minix/sys/kernel/ibm/RCS/wdeth.c,v 1.4 1995/01/12 22:03:57 philip Exp $
32164 */
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/kernel/wini.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
32200 /* wini.c - choose a winchester driver. Author: Kees J. Bot
32201 * 28 May 1994
32202 * Several different winchester drivers may be compiled
32203 * into the kernel, but only one may run. That one is chosen here using
32204 * the boot variable 'hd'.
32205 */
32206
32207 #include "kernel.h"
32208 #include "driver.h"
32209
32210 #if ENABLE_WINI
32211
32212 /* Map driver name to task function. */
32213 struct hdmap {
32214 char *name;
32215 task_t *task;
32216 } hdmap[] = {
32217
32218 #if ENABLE_AT_WINI
32219 { "at", at_winchester_task },
32220 #endif
32221
32222 #if ENABLE_BIOS_WINI
32223 { "bios", bios_winchester_task },
32224 #endif
32225
32226 #if ENABLE_ESDI_WINI
32227 { "esdi", esdi_winchester_task },
32228 #endif
32229
32230 #if ENABLE_XT_WINI
32231 { "xt", xt_winchester_task },
32232 #endif
32233
32234 };
32235
32236
32237 /*===========================================================================*
32238 * winchester_task *
32239 *===========================================================================*/
.Ep 454 src/kernel/wini.c
32240 PUBLIC void winchester_task()
32241 {
32242 /* Call the default or selected winchester task. */
32243 char *hd;
32244 struct hdmap *map;
32245
32246 hd = k_getenv("hd");
32247
32248 for (map = hdmap; map < hdmap + sizeof(hdmap)/sizeof(hdmap[0]); map++) {
32249 if (hd == NULL || strcmp(hd, map->name) == 0) {
32250 /* Run the selected winchester task. */
32251 (*map->task)();
32252 }
32253 }
32254 panic("no hd driver", NO_NUM);
32255 }
32256 #endif /* ENABLE_WINI */
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/kernel/xt_wini.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
32300 /* This file contains the device dependent part of a driver for the WD
32301 * winchester controller from Western Digital (WX-2 and related controllers).
32302 * It was written by Adri Koppes.
32303 *
32304 * The file contains one entry point:
32305 *
32306 * xt_winchester_task: main entry when system is brought up
32307 *
32308 *
32309 * Changes:
32310 * 10 Apr 1987 by Gary Oliver: use with the Western Digital WX-2.
32311 * ? by Harry McGavran: robust operation on turbo clones.
32312 * ? by Mike Mitchell: WX-2 auto configure operation.
32313 * 2 May 1992 by Kees J. Bot: device dependent/independent split.
32314 */
32315
32316 #include "kernel.h"
32317 #include "driver.h"
32318 #include "drvlib.h"
32319
32320 #if ENABLE_XT_WINI
32321
32322 /* If the DMA buffer is large enough then use it always. */
32323 #define USE_BUF (DMA_BUF_SIZE > BLOCK_SIZE)
32324
32325 /* I/O Ports used by winchester disk task. */
32326 #define WIN_DATA 0x320 /* winchester disk controller data register */
32327 #define WIN_STATUS 0x321 /* winchester disk controller status register */
32328 #define WST_REQ 0x001 /* Request bit */
32329 #define WST_INPUT 0x002 /* Set if controller is writing to cpu */
32330 #define WST_BUS 0x004 /* Command/status bit */
32331 #define WST_BUSY 0x008 /* Busy */
32332 #define WST_DRQ 0x010 /* DMA request */
32333 #define WST_IRQ 0x020 /* Interrupt request */
32334 #define WIN_SELECT 0x322 /* winchester disk controller select port */
.Op 455 src/kernel/xt_wini.c
32335 #define WIN_DMA 0x323 /* winchester disk controller dma register */
32336 #define DMA_ADDR 0x006 /* port for low 16 bits of DMA address */
32337 #define DMA_TOP 0x082 /* port for top 4 bits of 20-bit DMA addr */
32338 #define DMA_COUNT 0x007 /* port for DMA count (count = bytes - 1) */
32339 #define DMA_FLIPFLOP 0x00C /* DMA byte pointer flop-flop */
32340 #define DMA_MODE 0x00B /* DMA mode port */
32341 #define DMA_INIT 0x00A /* DMA init port */
32342
32343 /* Winchester disk controller command bytes. */
32344 #define WIN_RECALIBRATE 0x01 /* command for the drive to recalibrate */
32345 #define WIN_SENSE 0x03 /* command for the controller to get its status */
32346 #define WIN_READ 0x08 /* command for the drive to read */
32347 #define WIN_WRITE 0x0a /* command for the drive to write */
32348 #define WIN_SPECIFY 0x0C /* command for the controller to accept params */
32349 #define WIN_ECC_READ 0x0D /* command for the controller to read ecc length */
32350
32351 #define DMA_INT 3 /* Command with dma and interrupt */
32352 #define INT 2 /* Command with interrupt, no dma */
32353 #define NO_DMA_INT 0 /* Command without dma and interrupt */
32354
32355 /* DMA channel commands. */
32356 #define DMA_READ 0x47 /* DMA read opcode */
32357 #define DMA_WRITE 0x4B /* DMA write opcode */
32358
32359 /* Parameters for the disk drive. */
32360 #ifndef NR_SECTORS
32361 /* For RLL drives NR_SECTORS has to be defined in the makefile or in config.h.
32362 * There is some hope of getting it from the parameter table for these drives,
32363 * and then this driver should use wn_sectors like at_wini.c.
32364 * Unfortunately it is not standard in XT parameter tables.
32365 */
32366 #define NR_SECTORS 17 /* number of sectors per track */
32367 #endif
32368
32369 /* Error codes */
32370 #define ERR (-1) /* general error */
32371 #define ERR_BAD_SECTOR (-2) /* block marked bad detected */
32372
32373 /* Miscellaneous. */
32374 #define MAX_DRIVES 2 /* this driver support two drives (hd0 - hd9) */
32375 #define MAX_ERRORS 4 /* how often to try rd/wt before quitting */
32376 #define MAX_RESULTS 4 /* max number of bytes controller returns */
32377 #define NR_DEVICES (MAX_DRIVES * DEV_PER_DRIVE)
32378 #define SUB_PER_DRIVE (NR_PARTITIONS * NR_PARTITIONS)
32379 #define NR_SUBDEVS (MAX_DRIVES * SUB_PER_DRIVE)
32380 #define MAX_WIN_RETRY 32000 /* max # times to try to output to WIN */
32381 #if AUTO_BIOS
32382 #define AUTO_PARAM 0x1AD /* drive parameter table starts here in sect 0 */
32383 #define AUTO_ENABLE 0x10 /* auto bios enabled bit from status reg */
32384 /* some start up parameters in order to extract the drive parameter table */
32385 /* from the winchester. these should not need changed. */
32386 #define AUTO_CYLS 306 /* default number of cylinders */
32387 #define AUTO_HEADS 4 /* default number of heads */
32388 #define AUTO_RWC 307 /* default reduced write cylinder */
32389 #define AUTO_WPC 307 /* default write precomp cylinder */
32390 #define AUTO_ECC 11 /* default ecc burst */
32391 #define AUTO_CTRL 5 /* default winchester stepping speed byte */
32392 #endif
32393
32394 /* Variables. */
.Ep 456 src/kernel/xt_wini.c
32395 PRIVATE struct wini { /* main drive struct, one entry per drive */
32396 unsigned wn_cylinders; /* number of cylinders */
32397 unsigned wn_heads; /* number of heads */
32398 unsigned wn_reduced_wr; /* first cylinder with reduced write current */
32399 unsigned wn_precomp; /* first cylinder with write precompensation */
32400 unsigned wn_max_ecc; /* maximum ECC burst length */
32401 unsigned wn_ctlbyte; /* control byte for COMMANDS (10-Apr-87 GO) */
32402 unsigned wn_open_ct; /* in-use count */
32403 struct device wn_part[DEV_PER_DRIVE]; /* primary partitions: hd[0-4] */
32404 struct device wn_subpart[SUB_PER_DRIVE]; /* subpartitions: hd[1-4][a-d] */
32405 } wini[MAX_DRIVES], *w_wn;
32406
32407 PRIVATE struct trans {
32408 struct iorequest_s *tr_iop; /* belongs to this I/O request */
32409 unsigned long tr_block; /* first sector to transfer */
32410 unsigned tr_count; /* byte count */
32411 phys_bytes tr_phys; /* user physical address */
32412 phys_bytes tr_dma; /* DMA physical address */
32413 } wtrans[NR_IOREQS];
32414
32415 PRIVATE int w_need_reset = FALSE; /* set when controller must be reset */
32416 PRIVATE int nr_drives; /* Number of drives */
32417 PRIVATE int w_switches; /* Drive type switches */
32418 PRIVATE struct trans *w_tp; /* to add transfer requests */
32419 PRIVATE unsigned w_count; /* number of bytes to transfer */
32420 PRIVATE unsigned long w_nextblock; /* next block on disk to transfer */
32421 PRIVATE int w_opcode; /* DEV_READ or DEV_WRITE */
32422 PRIVATE int w_drive; /* selected drive */
32423 PRIVATE struct device *w_dv; /* device's base and size */
32424 PRIVATE char w_results[MAX_RESULTS];/* the controller can give lots of output */
32425
32426
32427 FORWARD _PROTOTYPE( struct device *w_prepare, (int device) );
32428 FORWARD _PROTOTYPE( char *w_name, (void) );
32429 FORWARD _PROTOTYPE( int w_schedule, (int proc_nr, struct iorequest_s *iop) );
32430 FORWARD _PROTOTYPE( int w_finish, (void) );
32431 FORWARD _PROTOTYPE( void w_dma_setup, (struct trans *tp, unsigned count) );
32432 FORWARD _PROTOTYPE( int w_transfer, (struct trans *tp, unsigned count) );
32433 FORWARD _PROTOTYPE( int win_results, (void) );
32434 FORWARD _PROTOTYPE( void win_out, (int val) );
32435 FORWARD _PROTOTYPE( int w_reset, (void) );
32436 FORWARD _PROTOTYPE( int w_handler, (int irq) );
32437 FORWARD _PROTOTYPE( int win_specify, (int drive) );
32438 FORWARD _PROTOTYPE( int check_init, (void) );
32439 FORWARD _PROTOTYPE( int read_ecc, (void) );
32440 FORWARD _PROTOTYPE( int hd_wait, (int bits) );
32441 FORWARD _PROTOTYPE( int com_out, (int mode, u8_t *command) );
32442 FORWARD _PROTOTYPE( void init_params, (void) );
32443 FORWARD _PROTOTYPE( int w_do_open, (struct driver *dp, message *m_ptr) );
32444 FORWARD _PROTOTYPE( int w_do_close, (struct driver *dp, message *m_ptr) );
32445 FORWARD _PROTOTYPE( void w_init, (void) );
32446 FORWARD _PROTOTYPE( void copy_param, (char *src, struct wini *dest) );
32447 FORWARD _PROTOTYPE( void w_geometry, (struct partition *entry));
32448
32449
32450 /* Entry points to this driver. */
32451 PRIVATE struct driver w_dtab = {
32452 w_name, /* current device's name */
32453 w_do_open, /* open or mount request, initialize device */
32454 w_do_close, /* release device */
.Op 457 src/kernel/xt_wini.c
32455 do_diocntl, /* get or set a partition's geometry */
32456 w_prepare, /* prepare for I/O on a given minor device */
32457 w_schedule, /* precompute cylinder, head, sector, etc. */
32458 w_finish, /* do the I/O */
32459 nop_cleanup, /* no cleanup needed */
32460 w_geometry /* tell the geometry of the disk */
32461 };
32462
32463
32464 /*===========================================================================*
32465 * xt_winchester_task *
32466 *===========================================================================*/
32467 PUBLIC void xt_winchester_task()
32468 {
32469 init_params();
32470
32471 put_irq_handler(XT_WINI_IRQ, w_handler);
32472 enable_irq(XT_WINI_IRQ); /* ready for winchester interrupts */
32473
32474 driver_task(&w_dtab);
32475 }
32478 /*===========================================================================*
32479 * w_prepare *
32480 *===========================================================================*/
32481 PRIVATE struct device *w_prepare(device)
32482 int device;
32483 {
32484 /* Prepare for I/O on a device. */
32485
32486 /* Nothing to transfer as yet. */
32487 w_count = 0;
32488
32489 if (device < NR_DEVICES) { /* hd0, hd1, ... */
32490 w_drive = device / DEV_PER_DRIVE; /* save drive number */
32491 w_wn = &wini[w_drive];
32492 w_dv = &w_wn->wn_part[device % DEV_PER_DRIVE];
32493 } else
32494 if ((unsigned) (device -= MINOR_hd1a) < NR_SUBDEVS) { /* hd1a, hd1b, ... */
32495 w_drive = device / SUB_PER_DRIVE;
32496 w_wn = &wini[w_drive];
32497 w_dv = &w_wn->wn_subpart[device % SUB_PER_DRIVE];
32498 } else {
32499 return(NIL_DEV);
32500 }
32501 return(w_drive < nr_drives ? w_dv : NIL_DEV);
32502 }
32505 /*===========================================================================*
32506 * w_name *
32507 *===========================================================================*/
32508 PRIVATE char *w_name()
32509 {
32510 /* Return a name for the current device. */
32511 static char name[] = "xt-hd5";
32512
32513 name[5] = '0' + w_drive * DEV_PER_DRIVE;
32514 return name;
.Ep 458 src/kernel/xt_wini.c
32515 }
32518 /*===========================================================================*
32519 * w_schedule *
32520 *===========================================================================*/
32521 PRIVATE int w_schedule(proc_nr, iop)
32522 int proc_nr; /* process doing the request */
32523 struct iorequest_s *iop; /* pointer to read or write request */
32524 {
32525 /* Gather I/O requests on consecutive blocks so they may be read/written
32526 * in one command if using a buffer. Check and gather all the requests
32527 * and try to finish them as fast as possible if unbuffered.
32528 */
32529 int r, opcode;
32530 unsigned long pos;
32531 unsigned nbytes, count, dma_count;
32532 unsigned long block;
32533 phys_bytes user_phys, dma_phys;
32534
32535 /* This many bytes to read/write */
32536 nbytes = iop->io_nbytes;
32537 if ((nbytes & SECTOR_MASK) != 0) return(iop->io_nbytes = EINVAL);
32538
32539 /* From/to this position on the device */
32540 pos = iop->io_position;
32541 if ((pos & SECTOR_MASK) != 0) return(iop->io_nbytes = EINVAL);
32542
32543 /* To/from this user address */
32544 user_phys = numap(proc_nr, (vir_bytes) iop->io_buf, nbytes);
32545 if (user_phys == 0) return(iop->io_nbytes = EINVAL);
32546
32547 /* Read or write? */
32548 opcode = iop->io_request & ~OPTIONAL_IO;
32549
32550 /* Which block on disk and how close to EOF? */
32551 if (pos >= w_dv->dv_size) return(OK); /* At EOF */
32552 if (pos + nbytes > w_dv->dv_size) nbytes = w_dv->dv_size - pos;
32553 block = (w_dv->dv_base + pos) >> SECTOR_SHIFT;
32554
32555 if (USE_BUF && w_count > 0 && block != w_nextblock) {
32556 /* This new request can't be chained to the job being built */
32557 if ((r = w_finish()) != OK) return(r);
32558 }
32559
32560 /* The next consecutive block */
32561 if (USE_BUF) w_nextblock = block + (nbytes >> SECTOR_SHIFT);
32562
32563 /* While there are "unscheduled" bytes in the request: */
32564 do {
32565 count = nbytes;
32566
32567 if (USE_BUF) {
32568 if (w_count == DMA_BUF_SIZE) {
32569 /* Can't transfer more than the buffer allows. */
32570 if ((r = w_finish()) != OK) return(r);
32571 }
32572
32573 if (w_count + count > DMA_BUF_SIZE)
32574 count = DMA_BUF_SIZE - w_count;
.Op 459 src/kernel/xt_wini.c
32575 } else {
32576 if (w_tp == wtrans + NR_IOREQS) {
32577 /* All transfer slots in use. */
32578 if ((r = w_finish()) != OK) return(r);
32579 }
32580 }
32581
32582 if (w_count == 0) {
32583 /* The first request in a row, initialize. */
32584 w_opcode = opcode;
32585 w_tp = wtrans;
32586 }
32587
32588 if (USE_BUF) {
32589 dma_phys = tmp_phys + w_count;
32590 } else {
32591 /* Memory chunk to DMA. */
32592 dma_phys = user_phys;
32593 dma_count = dma_bytes_left(dma_phys);
32594
32595 if (dma_count < count) {
32596 /* Nearing a 64K boundary. */
32597 if (dma_count >= SECTOR_SIZE) {
32598 /* Can read a few sectors before hitting the
32599 * boundary.
32600 */
32601 count = dma_count & ~SECTOR_MASK;
32602 } else {
32603 /* Must use the special buffer for this. */
32604 count = SECTOR_SIZE;
32605 dma_phys = tmp_phys;
32606 }
32607 }
32608 }
32609
32610 /* Store I/O parameters */
32611 w_tp->tr_iop = iop;
32612 w_tp->tr_block = block;
32613 w_tp->tr_count = count;
32614 w_tp->tr_phys = user_phys;
32615 w_tp->tr_dma = dma_phys;
32616
32617 /* Update counters */
32618 w_tp++;
32619 w_count += count;
32620 block += count >> SECTOR_SHIFT;
32621 user_phys += count;
32622 nbytes -= count;
32623 } while (nbytes > 0);
32624
32625 return(OK);
32626 }
32629 /*===========================================================================*
32630 * w_finish *
32631 *===========================================================================*/
32632 PRIVATE int w_finish()
32633 {
32634 /* Carry out the I/O requests gathered in wtrans[]. */
.Ep 460 src/kernel/xt_wini.c
32635
32636 struct trans *tp = wtrans, *tp2;
32637 unsigned count;
32638 int r, errors = 0, many = USE_BUF;
32639
32640 if (w_count == 0) return(OK); /* Spurious finish. */
32641
32642 do {
32643 if (w_opcode == DEV_WRITE) {
32644 tp2 = tp;
32645 count = 0;
32646 do {
32647 if (USE_BUF || tp2->tr_dma == tmp_phys) {
32648 phys_copy(tp2->tr_phys, tp2->tr_dma,
32649 (phys_bytes) tp2->tr_count);
32650 }
32651 count += tp2->tr_count;
32652 tp2++;
32653 } while (many && count < w_count);
32654 } else {
32655 count = many ? w_count : tp->tr_count;
32656 }
32657
32658 /* First check to see if a reset is needed. */
32659 if (w_need_reset) w_reset();
32660
32661 /* Now set up the DMA chip. */
32662 w_dma_setup(tp, count);
32663
32664 /* Perform the transfer. */
32665 r = w_transfer(tp, count);
32666
32667 if (r != OK) {
32668 /* An error occurred, try again block by block unless */
32669 if (r == ERR_BAD_SECTOR || ++errors == MAX_ERRORS)
32670 return(tp->tr_iop->io_nbytes = EIO);
32671
32672 /* Reset if halfway, but bail out if optional I/O. */
32673 if (errors == MAX_ERRORS / 2) {
32674 w_need_reset = TRUE;
32675 if (tp->tr_iop->io_request & OPTIONAL_IO)
32676 return(tp->tr_iop->io_nbytes = EIO);
32677 }
32678 many = 0;
32679 continue;
32680 }
32681 errors = 0;
32682
32683 w_count -= count;
32684
32685 do {
32686 if (w_opcode == DEV_READ) {
32687 if (USE_BUF || tp->tr_dma == tmp_phys) {
32688 phys_copy(tp->tr_dma, tp->tr_phys,
32689 (phys_bytes) tp->tr_count);
32690 }
32691 }
32692 tp->tr_iop->io_nbytes -= tp->tr_count;
32693 count -= tp->tr_count;
32694 tp++;
.Op 461 src/kernel/xt_wini.c
32695 } while (count > 0);
32696 } while (w_count > 0);
32697
32698 return(OK);
32699 }
32702 /*==========================================================================*
32703 * w_dma_setup *
32704 *==========================================================================*/
32705 PRIVATE void w_dma_setup(tp, count)
32706 struct trans *tp; /* pointer to the transfer struct */
32707 unsigned count; /* bytes to transfer */
32708 {
32709 /* The IBM PC can perform DMA operations by using the DMA chip. To use it,
32710 * the DMA (Direct Memory Access) chip is loaded with the 20-bit memory address
32711 * to by read from or written to, the byte count minus 1, and a read or write
32712 * opcode. This routine sets up the DMA chip. Note that the chip is not
32713 * capable of doing a DMA across a 64K boundary (e.g., you can't read a
32714 * 512-byte block starting at physical address 65520).
32715 */
32716
32717 /* Set up the DMA registers. */
32718 out_byte(DMA_FLIPFLOP, 0); /* write anything to reset it */
32719 out_byte(DMA_MODE, w_opcode == DEV_WRITE ? DMA_WRITE : DMA_READ);
32720 out_byte(DMA_ADDR, (int) tp->tr_dma >> 0);
32721 out_byte(DMA_ADDR, (int) tp->tr_dma >> 8);
32722 out_byte(DMA_TOP, (int) (tp->tr_dma >> 16));
32723 out_byte(DMA_COUNT, (count - 1) >> 0);
32724 out_byte(DMA_COUNT, (count - 1) >> 8);
32725 }
32728 /*=========================================================================*
32729 * w_transfer *
32730 *=========================================================================*/
32731 PRIVATE int w_transfer(tp, count)
32732 struct trans *tp; /* pointer to the transfer struct */
32733 unsigned count; /* transferring count bytes */
32734 {
32735 /* Read or write count bytes starting with tp->tr_block. */
32736
32737 unsigned cylinder, sector, head, secspcyl = w_wn->wn_heads * NR_SECTORS;
32738 u8_t command[6];
32739 message mess;
32740
32741 cylinder = tp->tr_block / secspcyl;
32742 head = (tp->tr_block % secspcyl) / NR_SECTORS;
32743 sector = tp->tr_block % NR_SECTORS;
32744
32745 /* The command is issued by outputting 6 bytes to the controller chip. */
32746 command[0] = w_opcode == DEV_WRITE ? WIN_WRITE : WIN_READ;
32747 command[1] = head | (w_drive << 5);
32748 command[2] = ((cylinder & 0x0300) >> 2) | sector;
32749 command[3] = cylinder & 0xFF;
32750 command[4] = count >> SECTOR_SHIFT;
32751 command[5] = w_wn->wn_ctlbyte;
32752
32753 if (com_out(DMA_INT, command) != OK)
32754 return(ERR);
.Ep 462 src/kernel/xt_wini.c
32755
32756 out_byte(DMA_INIT, 3); /* initialize DMA */
32757
32758 /* Block, waiting for disk interrupt. */
32759 receive(HARDWARE, &mess);
32760
32761 /* Get controller status and check for errors. */
32762 if (win_results() == OK)
32763 return(OK);
32764 if ((w_results[0] & 63) == 24)
32765 read_ecc();
32766 else
32767 w_need_reset = TRUE;
32768 return(ERR);
32769 }
32772 /*==========================================================================*
32773 * win_results *
32774 *==========================================================================*/
32775 PRIVATE int win_results()
32776 {
32777 /* Extract results from the controller after an operation. */
32778
32779 int i, status;
32780 u8_t command[6];
32781
32782 status = in_byte(WIN_DATA);
32783 out_byte(WIN_DMA, 0);
32784 if (!(status & 2)) /* Test "error" bit */
32785 return(OK);
32786 command[0] = WIN_SENSE;
32787 command[1] = w_drive << 5;
32788 if (com_out(NO_DMA_INT, command) != OK)
32789 return(ERR);
32790
32791 /* Loop, extracting bytes from WIN */
32792 for (i = 0; i < MAX_RESULTS; i++) {
32793 if (hd_wait(WST_REQ) != OK)
32794 return(ERR);
32795 status = in_byte(WIN_DATA);
32796 w_results[i] = status & BYTE;
32797 }
32798 if (hd_wait(WST_REQ) != OK) /* Missing from */
32799 return (ERR); /* Original. 11-Apr-87 G.O. */
32800
32801 status = in_byte(WIN_DATA); /* Read "error" flag */
32802
32803 if (((status & 2) != 0) || (w_results[0] & 0x3F)) {
32804 return(ERR);
32805 } else
32806 return(OK);
32807 }
32810 /*===========================================================================*
32811 * win_out *
32812 *===========================================================================*/
32813 PRIVATE void win_out(val)
32814 int val; /* write this byte to winchester disk controller */
.Op 463 src/kernel/xt_wini.c
32815 {
32816 /* Output a byte to the controller. This is not entirely trivial, since you
32817 * can only write to it when it is listening, and it decides when to listen.
32818 * If the controller refuses to listen, the WIN chip is given a hard reset.
32819 */
32820 int r;
32821
32822 if (w_need_reset) return; /* if controller is not listening, return */
32823
32824 do {
32825 r = in_byte(WIN_STATUS);
32826 } while((r & (WST_REQ | WST_BUSY)) == WST_BUSY);
32827
32828 out_byte(WIN_DATA, val);
32829 }
32832 /*===========================================================================*
32833 * w_reset *
32834 *===========================================================================*/
32835 PRIVATE int w_reset()
32836 {
32837 /* Issue a reset to the controller. This is done after any catastrophe,
32838 * like the controller refusing to respond.
32839 */
32840
32841 int r, i, drive;
32842 u8_t command[6];
32843 message mess;
32844
32845 /* Strobe reset bit low. */
32846 out_byte(WIN_STATUS, 0);
32847
32848 milli_delay(5); /* Wait for a while */
32849
32850 out_byte(WIN_SELECT, 0); /* Issue select pulse */
32851 for (i = 0; i < MAX_WIN_RETRY; i++) {
32852 r = in_byte(WIN_STATUS);
32853 if (r & (WST_DRQ | WST_IRQ))
32854 return(ERR);
32855
32856 if ((r & (WST_BUSY | WST_BUS | WST_REQ)) ==
32857 (WST_BUSY | WST_BUS | WST_REQ))
32858 break;
32859 }
32860
32861 if (i == MAX_WIN_RETRY) {
32862 printf("%s: reset failed, status = %xn", w_name(), r);
32863 return(ERR);
32864 }
32865
32866 /* Reset succeeded. Tell WIN drive parameters. */
32867 w_need_reset = FALSE;
32868
32869 for (drive = 0; drive < nr_drives; drive++) {
32870 if (win_specify(drive) != OK)
32871 return (ERR);
32872
32873 command[0] = WIN_RECALIBRATE;
32874 command[1] = drive << 5;
.Ep 464 src/kernel/xt_wini.c
32875 command[5] = wini[drive].wn_ctlbyte;
32876
32877 if (com_out(INT, command) != OK)
32878 return(ERR);
32879
32880 receive(HARDWARE, &mess);
32881
32882 if (win_results() != OK) {
32883 /* No actual drive present? */
32884 nr_drives = drive;
32885 }
32886 }
32887 return(nr_drives > 0 ? OK : ERR);
32888 }
32891 /*==========================================================================*
32892 * w_handler *
32893 *==========================================================================*/
32894 PRIVATE int w_handler(irq)
32895 int irq;
32896 {
32897 /* Disk interrupt, send message to winchester task and reenable interrupts. */
32898
32899 int r, i;
32900
32901 out_byte(DMA_INIT, 0x07); /* Disable int from DMA */
32902
32903 for (i = 0; i < MAX_WIN_RETRY; ++i) {
32904 r = in_byte(WIN_STATUS);
32905 if (r & WST_IRQ)
32906 break; /* Exit if end of int */
32907 }
32908
32909 interrupt(WINCHESTER);
32910 return 1;
32911 }
32914 /*============================================================================*
32915 * win_specify *
32916 *============================================================================*/
32917 PRIVATE int win_specify(drive)
32918 int drive;
32919 {
32920 struct wini *wn = &wini[drive];
32921 u8_t command[6];
32922
32923 command[0] = WIN_SPECIFY; /* Specify some parameters */
32924 command[1] = drive << 5; /* Drive number */
32925
32926 if (com_out(NO_DMA_INT, command) != OK) /* Output command block */
32927 return(ERR);
32928
32929 /* No. of cylinders (high byte) */
32930 win_out(wn->wn_cylinders >> 8);
32931
32932 /* No. of cylinders (low byte) */
32933 win_out(wn->wn_cylinders);
32934
.Op 465 src/kernel/xt_wini.c
32935 /* No. of heads */
32936 win_out(wn->wn_heads);
32937
32938 /* Start reduced write (high byte) */
32939 win_out(wn->wn_reduced_wr >> 8);
32940
32941 /* Start reduced write (low byte) */
32942 win_out(wn->wn_reduced_wr);
32943
32944 /* Start write precompensation (high byte) */
32945 win_out(wn->wn_precomp >> 8);
32946
32947 /* Start write precompensation (low byte) */
32948 win_out(wn->wn_precomp);
32949
32950 /* Ecc burst length */
32951 win_out(wn->wn_max_ecc);
32952
32953 if (check_init() != OK) { /* See if controller accepted parameters */
32954 w_need_reset = TRUE;
32955 return(ERR);
32956 } else
32957 return(OK);
32958 }
32961 /*============================================================================*
32962 * check_init *
32963 *============================================================================*/
32964 PRIVATE int check_init()
32965 {
32966 /* Routine to check if controller accepted the parameters */
32967 int r, s;
32968
32969 if (hd_wait(WST_REQ | WST_INPUT) == OK) {
32970 r = in_byte(WIN_DATA);
32971
32972 do {
32973 s = in_byte(WIN_STATUS);
32974 } while(s & WST_BUSY); /* Loop while still busy */
32975
32976 if (r & 2) /* Test error bit */
32977 return(ERR);
32978 else
32979 return(OK);
32980 } else
32981 return (ERR); /* Missing from original: 11-Apr-87 G.O. */
32982 }
32985 /*============================================================================*
32986 * read_ecc *
32987 *============================================================================*/
32988 PRIVATE int read_ecc()
32989 {
32990 /* Read the ecc burst-length and let the controller correct the data */
32991
32992 int r;
32993 u8_t command[6];
32994
.Ep 466 src/kernel/xt_wini.c
32995 command[0] = WIN_ECC_READ;
32996 if (com_out(NO_DMA_INT, command) == OK && hd_wait(WST_REQ) == OK) {
32997 r = in_byte(WIN_DATA);
32998 if (hd_wait(WST_REQ) == OK) {
32999 r = in_byte(WIN_DATA);
33000 if (r & 1)
33001 w_need_reset = TRUE;
33002 }
33003 }
33004 return(ERR);
33005 }
33008 /*============================================================================*
33009 * hd_wait *
33010 *============================================================================*/
33011 PRIVATE int hd_wait(bits)
33012 int bits;
33013 {
33014 /* Wait until the controller is ready to receive a command or send status */
33015
33016 int r, i = 0;
33017
33018 do {
33019 r = in_byte(WIN_STATUS) & bits;
33020 } while ((i++ < MAX_WIN_RETRY) && r != bits); /* Wait for ALL bits */
33021
33022 if (i >= MAX_WIN_RETRY) {
33023 w_need_reset = TRUE;
33024 return(ERR);
33025 } else
33026 return(OK);
33027 }
33030 /*============================================================================*
33031 * com_out *
33032 *============================================================================*/
33033 PRIVATE int com_out(mode, commandp)
33034 int mode;
33035 u8_t *commandp;
33036 {
33037 /* Output the command block to the winchester controller and return status */
33038
33039 int i, r;
33040
33041 out_byte(WIN_DMA, mode);
33042 out_byte(WIN_SELECT, mode);
33043 for (i = 0; i < MAX_WIN_RETRY; i++) {
33044 r = in_byte(WIN_STATUS);
33045 if (r & WST_BUSY)
33046 break;
33047 }
33048
33049 if (i == MAX_WIN_RETRY) {
33050 w_need_reset = TRUE;
33051 return(ERR);
33052 }
33053
33054
.Op 467 src/kernel/xt_wini.c
33055 for (i = 0; i < 6; i++) {
33056 if (hd_wait(WST_REQ) != OK)
33057 break; /* No data request pending */
33058
33059 r = in_byte(WIN_STATUS);
33060
33061 if ((r & (WST_BUSY | WST_BUS | WST_INPUT)) !=
33062 (WST_BUSY | WST_BUS))
33063 break;
33064
33065 out_byte(WIN_DATA, commandp[i]);
33066 }
33067
33068 if (i != 6)
33069 return(ERR);
33070 else
33071 return(OK);
33072 }
33075 /*==========================================================================*
33076 * init_params *
33077 *==========================================================================*/
33078 PRIVATE void init_params()
33079 {
33080 /* This routine is called at startup to initialize the number of drives and
33081 * the controller.
33082 */
33083 u16_t parv[2];
33084 unsigned int drive;
33085 int dtype;
33086 phys_bytes address, buf_phys;
33087 char buf[16];
33088
33089 /* Get the number of drives from the bios */
33090 buf_phys = vir2phys(buf);
33091 phys_copy(0x475L, buf_phys, 1L);
33092 nr_drives = buf[0] & 0xFF;
33093 if (nr_drives > MAX_DRIVES) nr_drives = MAX_DRIVES;
33094
33095 /* Read the switches from the controller */
33096 w_switches = in_byte(WIN_SELECT);
33097
33098 #if AUTO_BIOS
33099 /* If no auto configuration or not enabled then go to the ROM. */
33100 if (!(w_switches & AUTO_ENABLE)) {
33101 #endif
33102 for (drive = 0; drive < nr_drives; drive++) {
33103 /* Calculate the drive type */
33104 dtype = (w_switches >> (2 * drive)) & 03;
33105
33106 /* Copy the BIOS parameter vector */
33107 phys_copy(WINI_0_PARM_VEC * 4L, vir2phys(parv), 4L);
33108
33109 /* Calculate the parameters' address and copy them to buf */
33110 address = hclick_to_physb(parv[1]) + parv[0] + 16 * dtype;
33111 phys_copy(address, buf_phys, 16L);
33112
33113 /* Copy the parameters to the structure of the drive. */
33114 copy_param(buf, &wini[drive]);
.Ep 468 src/kernel/xt_wini.c
33115 }
33116 #if AUTO_BIOS
33117 }
33118 #endif
33119 }
33122 /*============================================================================*
33123 * w_do_open *
33124 *============================================================================*/
33125 PRIVATE int w_do_open(dp, m_ptr)
33126 struct driver *dp;
33127 message *m_ptr;
33128 {
33129 /* Device open: Initialize the controller and read the partition table. */
33130
33131 static int init_done = FALSE;
33132
33133 if (!init_done) { w_init(); init_done = TRUE; }
33134
33135 if (w_prepare(m_ptr->DEVICE) == NIL_DEV) return(ENXIO);
33136
33137 if (w_wn->wn_open_ct++ == 0) {
33138 /* Partition the disk. */
33139 partition(&w_dtab, w_drive * DEV_PER_DRIVE, P_PRIMARY);
33140 }
33141 return(OK);
33142 }
33145 /*============================================================================*
33146 * w_do_close *
33147 *============================================================================*/
33148 PRIVATE int w_do_close(dp, m_ptr)
33149 struct driver *dp;
33150 message *m_ptr;
33151 {
33152 /* Device close: Release a device. */
33153
33154 if (w_prepare(m_ptr->DEVICE) == NIL_DEV) return(ENXIO);
33155 w_wn->wn_open_ct--;
33156 return(OK);
33157 }
33160 /*==========================================================================*
33161 * w_init *
33162 *==========================================================================*/
33163 PRIVATE void w_init()
33164 {
33165 /* Initialize the controller. */
33166
33167 int drive;
33168 struct wini *wn;
33169 #if AUTO_BIOS
33170 message mess;
33171
33172 for (drive = 0; drive < nr_drives; drive++) {
33173 /* Get the drive parameters from sector zero of the drive if the
33174 * autoconfig mode of the controller has been selected.
.Op 469 src/kernel/xt_wini.c
33175 */
33176 if (w_switches & AUTO_ENABLE) {
33177 /* Set up some phony parameters so that we can read the
33178 * first sector from the winchester. All drives will have
33179 * one cylinder and one head but set up initially to the
33180 * mini scribe drives from IBM.
33181 */
33182 wn = &wini[drive];
33183 wn->wn_cylinders = AUTO_CYLS;
33184 wn->wn_heads = AUTO_HEADS;
33185 wn->wn_reduced_wr = AUTO_RWC;
33186 wn->wn_precomp = AUTO_WPC;
33187 wn->wn_max_ecc = AUTO_ECC;
33188 wn->wn_ctlbyte = AUTO_CTRL;
33189 wn->wn_part[0].dv_size = SECTOR_SIZE;
33190 }
33191 }
33192
33193 /* Initialize controller to read parameters from the drives. */
33194 if (nr_drives > 0 && w_reset() != OK) nr_drives = 0;
33195
33196 for (drive = 0; drive < nr_drives; drive++) {
33197 if (w_switches & AUTO_ENABLE) {
33198 /* read the first sector from the drive */
33199 mess.DEVICE = drive * DEV_PER_DRIVE;
33200 mess.POSITION = 0L;
33201 mess.COUNT = SECTOR_SIZE;
33202 mess.ADDRESS = (char *) tmp_buf;
33203 mess.PROC_NR = WINCHESTER;
33204 mess.m_type = DEV_READ;
33205 if (do_rdwt(&w_dtab, &mess) != SECTOR_SIZE) {
33206 printf("%s: can't read parametersn", w_name());
33207 nr_drives = drive;
33208 break;
33209 }
33210
33211 /* save the parameter tables for later use */
33212 copy_param(&tmp_buf[AUTO_PARAM], &wini[drive]);
33213 }
33214 }
33215 #endif
33216
33217 if (nr_drives > 0 && w_reset() != OK) nr_drives = 0;
33218
33219 /* Set the size of each disk. */
33220 for (drive = 0; drive < nr_drives; drive++) {
33221 (void) w_prepare(drive * DEV_PER_DRIVE);
33222 wn = w_wn;
33223 wn->wn_part[0].dv_size = ((unsigned long) wn->wn_cylinders *
33224 wn->wn_heads * NR_SECTORS) << SECTOR_SHIFT;
33225 printf("%s: %d cylinders, %d heads, %d sectors per trackn",
33226 w_name(), wn->wn_cylinders, wn->wn_heads, NR_SECTORS);
33227 }
33228 }
33231 /*==========================================================================*
33232 * copy_param *
33233 *==========================================================================*/
33234 PRIVATE void copy_param(src, dest)
.Ep 470 src/kernel/xt_wini.c
33235 char *src;
33236 struct wini *dest;
33237 {
33238 /* This routine copies the parameters from src to dest. */
33239
33240 dest->wn_cylinders = bp_cylinders(src);
33241 dest->wn_heads = bp_heads(src);
33242 dest->wn_reduced_wr = bp_reduced_wr(src);
33243 dest->wn_precomp = bp_precomp(src);
33244 dest->wn_max_ecc = bp_max_ecc(src);
33245 dest->wn_ctlbyte = bp_ctlbyte(src);
33246 }
33249 /*============================================================================*
33250 * w_geometry *
33251 *============================================================================*/
33252 PRIVATE void w_geometry(entry)
33253 struct partition *entry;
33254 {
33255 entry->cylinders = w_wn->wn_cylinders;
33256 entry->heads = w_wn->wn_heads;
33257 entry->sectors = NR_SECTORS;
33258 }
33259 #endif /* ENABLE_XT_WINI */
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/kernel/klib.s
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
33300 #
33301 ! Chooses between the 8086 and 386 versions of the low level kernel code.
33302
33303 #include <minix/config.h>
33304 #if _WORD_SIZE == 2
33305 #include "klib88.s"
33306 #else
33307 #include "klib386.s"
33308 #endif
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/kernel/klib386.s
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
33400 #
33401 ! sections
33402
33403 .sect .text; .sect .rom; .sect .data; .sect .bss
33404
33405 #include <minix/config.h>
33406 #include <minix/const.h>
33407 #include "const.h"
33408 #include "sconst.h"
33409 #include "protect.h"
.Op 471 src/kernel/klib386.s
33410
33411 ! This file contains a number of assembly code utility routines needed by the
33412 ! kernel. They are:
33413
33414 .define _monitor ! exit Minix and return to the monitor
33415 .define _check_mem ! check a block of memory, return the valid size
33416 .define _cp_mess ! copies messages from source to destination
33417 .define _exit ! dummy for library routines
33418 .define __exit ! dummy for library routines
33419 .define ___exit ! dummy for library routines
33420 .define ___main ! dummy for GCC
33421 .define _in_byte ! read a byte from a port and return it
33422 .define _in_word ! read a word from a port and return it
33423 .define _out_byte ! write a byte to a port
33424 .define _out_word ! write a word to a port
33425 .define _port_read ! transfer data from (disk controller) port to memory
33426 .define _port_read_byte ! likewise byte by byte
33427 .define _port_write ! transfer data from memory to (disk controller) port
33428 .define _port_write_byte ! likewise byte by byte
33429 .define _lock ! disable interrupts
33430 .define _unlock ! enable interrupts
33431 .define _enable_irq ! enable an irq at the 8259 controller
33432 .define _disable_irq ! disable an irq
33433 .define _phys_copy ! copy data from anywhere to anywhere in memory
33434 .define _mem_rdw ! copy one word from [segment:offset]
33435 .define _reset ! reset the system
33436 .define _mem_vid_copy ! copy data to video ram
33437 .define _vid_vid_copy ! move data in video ram
33438 .define _level0 ! call a function at level 0
33439
33440 ! The routines only guarantee to preserve the registers the C compiler
33441 ! expects to be preserved (ebx, esi, edi, ebp, esp, segment registers, and
33442 ! direction bit in the flags).
33443
33444 ! imported variables
33445
33446 .sect .bss
33447 .extern _mon_return, _mon_sp
33448 .extern _irq_use
33449 .extern _blank_color
33450 .extern _ext_memsize
33451 .extern _gdt
33452 .extern _low_memsize
33453 .extern _sizes
33454 .extern _vid_seg
33455 .extern _vid_size
33456 .extern _vid_mask
33457 .extern _level0_func
33458
33459 .sect .text
33460 !*===========================================================================*
33461 !* monitor *
33462 !*===========================================================================*
33463 ! PUBLIC void monitor();
33464 ! Return to the monitor.
33465
33466 _monitor:
33467 mov eax, (_reboot_code) ! address of new parameters
33468 mov esp, (_mon_sp) ! restore monitor stack pointer
33469 o16 mov dx, SS_SELECTOR ! monitor data segment
.Ep 472 src/kernel/klib386.s
33470 mov ds, dx
33471 mov es, dx
33472 mov fs, dx
33473 mov gs, dx
33474 mov ss, dx
33475 pop edi
33476 pop esi
33477 pop ebp
33478 o16 retf ! return to the monitor
33479
33480
33481 #if ENABLE_BIOS_WINI
33482 !*===========================================================================*
33483 !* bios13 *
33484 !*===========================================================================*
33485 ! PUBLIC void bios13();
33486 .define _bios13
33487 _bios13:
33488 cmpb (_mon_return), 0 ! is the monitor there?
33489 jnz 0f
33490 movb (_Ax+1), 0x01 ! "invalid command"
33491 ret
33492 0: push ebp ! save C registers
33493 push esi
33494 push edi
33495 push ebx
33496 pushf ! save flags
33497 cli ! no interruptions
33498
33499 inb INT2_CTLMASK
33500 movb ah, al
33501 inb INT_CTLMASK
33502 push eax ! save interrupt masks
33503 mov eax, (_irq_use) ! map of in-use IRQs
33504 and eax, ~[1<<CLOCK_IRQ] ! there is a special clock handler
33505 outb INT_CTLMASK ! enable all unused IRQs and vv.
33506 movb al, ah
33507 outb INT2_CTLMASK
33508
33509 mov eax, cr0
33510 push eax ! save machine status word
33511
33512 mov eax, SS_SELECTOR ! monitor data segment
33513 mov ss, ax
33514 xchg esp, (_mon_sp) ! switch stacks
33515 o16 push (_Es) ! parameters used in bios 13 call
33516 o16 push (_Dx)
33517 o16 push (_Cx)
33518 o16 push (_Bx)
33519 o16 push (_Ax)
33520 mov ds, ax ! remaining data selectors
33521 mov es, ax
33522 mov fs, ax
33523 mov gs, ax
33524 push cs
33525 push return ! kernel return address and selector
33526 o16 jmpf 16+2*4+5*2+2*4(esp) ! make the call
33527 return:
33528 o16 pop (_Ax)
33529 o16 pop (_Bx)
.Op 473 src/kernel/klib386.s
33530 o16 pop (_Cx)
33531 o16 pop (_Dx)
33532 o16 pop (_Es)
33533 lgdt (_gdt+GDT_SELECTOR) ! reload global descriptor table
33534 jmpf CS_SELECTOR:csinit ! restore everything
33535 csinit: mov eax, DS_SELECTOR
33536 mov ds, ax
33537 mov es, ax
33538 mov fs, ax
33539 mov gs, ax
33540 mov ss, ax
33541 xchg esp, (_mon_sp) ! unswitch stacks
33542 lidt (_gdt+IDT_SELECTOR) ! reload interrupt descriptor table
33543 andb (_gdt+TSS_SELECTOR+DESC_ACCESS), ~0x02 ! clear TSS busy bit
33544 mov ax, TSS_SELECTOR
33545 ltr ax ! set TSS register
33546
33547 pop eax
33548 mov cr0, eax ! restore machine status word
33549
33550 pop eax
33551 outb INT_CTLMASK ! restore interrupt masks
33552 movb al, ah
33553 outb INT2_CTLMASK
33554
33555 popf ! restore flags
33556 pop ebx ! restore C registers
33557 pop edi
33558 pop esi
33559 pop ebp
33560 ret
33561
33562 .sect .bss
33563 .define _Ax, _Bx, _Cx, _Dx, _Es ! 8086 register variables
33564 .comm _Ax, 4
33565 .comm _Bx, 4
33566 .comm _Cx, 4
33567 .comm _Dx, 4
33568 .comm _Es, 4
33569 .sect .text
33570 #endif /* ENABLE_BIOS_WINI */
33571
33572
33573 !*===========================================================================*
33574 !* check_mem *
33575 !*===========================================================================*
33576 ! PUBLIC phys_bytes check_mem(phys_bytes base, phys_bytes size);
33577 ! Check a block of memory, return the amount valid.
33578 ! Only every 16th byte is checked.
33579 ! An initial size of 0 means everything.
33580 ! This really should do some alias checks.
33581
33582 CM_DENSITY = 16
33583 CM_LOG_DENSITY = 4
33584 TEST1PATTERN = 0x55 ! memory test pattern 1
33585 TEST2PATTERN = 0xAA ! memory test pattern 2
33586
33587 CHKM_ARGS = 4 + 4 + 4 ! 4 + 4
33588 ! ds ebx eip base size
33589
.Ep 474 src/kernel/klib386.s
33590 _check_mem:
33591 push ebx
33592 push ds
33593 o16 mov ax, FLAT_DS_SELECTOR
33594 mov ds, ax
33595 mov eax, CHKM_ARGS(esp)
33596 mov ebx, eax
33597 mov ecx, CHKM_ARGS+4(esp)
33598 shr ecx, CM_LOG_DENSITY
33599 cm_loop:
33600 movb dl, TEST1PATTERN
33601 xchgb dl, (eax) ! write test pattern, remember original
33602 xchgb dl, (eax) ! restore original, read test pattern
33603 cmpb dl, TEST1PATTERN ! must agree if good real memory
33604 jnz cm_exit ! if different, memory is unusable
33605 movb dl, TEST2PATTERN
33606 xchgb dl, (eax)
33607 xchgb dl, (eax)
33608 add eax, CM_DENSITY
33609 cmpb dl, TEST2PATTERN
33610 loopz cm_loop
33611 cm_exit:
33612 sub eax, ebx
33613 pop ds
33614 pop ebx
33615 ret
33616
33617
33618 !*===========================================================================*
33619 !* cp_mess *
33620 !*===========================================================================*
33621 ! PUBLIC void cp_mess(int src, phys_clicks src_clicks, vir_bytes src_offset,
33622 ! phys_clicks dst_clicks, vir_bytes dst_offset);
33623 ! This routine makes a fast copy of a message from anywhere in the address
33624 ! space to anywhere else. It also copies the source address provided as a
33625 ! parameter to the call into the first word of the destination message.
33626 !
33627 ! Note that the message size, "Msize" is in DWORDS (not bytes) and must be set
33628 ! correctly. Changing the definition of message in the type file and not
33629 ! changing it here will lead to total disaster.
33630
33631 CM_ARGS = 4 + 4 + 4 + 4 + 4 ! 4 + 4 + 4 + 4 + 4
33632 ! es ds edi esi eip proc scl sof dcl dof
33633
33634 .align 16
33635 _cp_mess:
33636 cld
33637 push esi
33638 push edi
33639 push ds
33640 push es
33641
33642 mov eax, FLAT_DS_SELECTOR
33643 mov ds, ax
33644 mov es, ax
33645
33646 mov esi, CM_ARGS+4(esp) ! src clicks
33647 shl esi, CLICK_SHIFT
33648 add esi, CM_ARGS+4+4(esp) ! src offset
33649 mov edi, CM_ARGS+4+4+4(esp) ! dst clicks
.Op 475 src/kernel/klib386.s
33650 shl edi, CLICK_SHIFT
33651 add edi, CM_ARGS+4+4+4+4(esp) ! dst offset
33652
33653 mov eax, CM_ARGS(esp) ! process number of sender
33654 stos ! copy number of sender to dest message
33655 add esi, 4 ! do not copy first word
33656 mov ecx, Msize - 1 ! remember, first word does not count
33657 rep
33658 movs ! copy the message
33659
33660 pop es
33661 pop ds
33662 pop edi
33663 pop esi
33664 ret ! that is all folks!
33665
33666
33667 !*===========================================================================*
33668 !* exit *
33669 !*===========================================================================*
33670 ! PUBLIC void exit();
33671 ! Some library routines use exit, so provide a dummy version.
33672 ! Actual calls to exit cannot occur in the kernel.
33673 ! GNU CC likes to call ___main from main() for nonobvious reasons.
33674
33675 _exit:
33676 __exit:
33677 ___exit:
33678 sti
33679 jmp ___exit
33680
33681 ___main:
33682 ret
33683
33684
33685 !*===========================================================================*
33686 !* in_byte *
33687 !*===========================================================================*
33688 ! PUBLIC unsigned in_byte(port_t port);
33689 ! Read an (unsigned) byte from the i/o port port and return it.
33690
33691 .align 16
33692 _in_byte:
33693 mov edx, 4(esp) ! port
33694 sub eax, eax
33695 inb dx ! read 1 byte
33696 ret
33697
33698
33699 !*===========================================================================*
33700 !* in_word *
33701 !*===========================================================================*
33702 ! PUBLIC unsigned in_word(port_t port);
33703 ! Read an (unsigned) word from the i/o port port and return it.
33704
33705 .align 16
33706 _in_word:
33707 mov edx, 4(esp) ! port
33708 sub eax, eax
33709 o16 in dx ! read 1 word
.Ep 476 src/kernel/klib386.s
33710 ret
33711
33712
33713 !*===========================================================================*
33714 !* out_byte *
33715 !*===========================================================================*
33716 ! PUBLIC void out_byte(port_t port, u8_t value);
33717 ! Write value (cast to a byte) to the I/O port port.
33718
33719 .align 16
33720 _out_byte:
33721 mov edx, 4(esp) ! port
33722 movb al, 4+4(esp) ! value
33723 outb dx ! output 1 byte
33724 ret
33725
33726
33727 !*===========================================================================*
33728 !* out_word *
33729 !*===========================================================================*
33730 ! PUBLIC void out_word(Port_t port, U16_t value);
33731 ! Write value (cast to a word) to the I/O port port.
33732
33733 .align 16
33734 _out_word:
33735 mov edx, 4(esp) ! port
33736 mov eax, 4+4(esp) ! value
33737 o16 out dx ! output 1 word
33738 ret
33739
33740
33741 !*===========================================================================*
33742 !* port_read *
33743 !*===========================================================================*
33744 ! PUBLIC void port_read(port_t port, phys_bytes destination, unsigned bytcount);
33745 ! Transfer data from (hard disk controller) port to memory.
33746
33747 PR_ARGS = 4 + 4 + 4 ! 4 + 4 + 4
33748 ! es edi eip port dst len
33749
33750 .align 16
33751 _port_read:
33752 cld
33753 push edi
33754 push es
33755 mov ecx, FLAT_DS_SELECTOR
33756 mov es, cx
33757 mov edx, PR_ARGS(esp) ! port to read from
33758 mov edi, PR_ARGS+4(esp) ! destination addr
33759 mov ecx, PR_ARGS+4+4(esp) ! byte count
33760 shr ecx, 1 ! word count
33761 rep ! (hardware cannot handle dwords)
33762 o16 ins ! read everything
33763 pop es
33764 pop edi
33765 ret
33766
33767
33768 !*===========================================================================*
33769 !* port_read_byte *
.Op 477 src/kernel/klib386.s
33770 !*===========================================================================*
33771 ! PUBLIC void port_read_byte(port_t port, phys_bytes destination,
33772 ! unsigned bytcount);
33773 ! Transfer data from port to memory.
33774
33775 PR_ARGS_B = 4 + 4 + 4 ! 4 + 4 + 4
33776 ! es edi eip port dst len
33777
33778 _port_read_byte:
33779 cld
33780 push edi
33781 push es
33782 mov ecx, FLAT_DS_SELECTOR
33783 mov es, cx
33784 mov edx, PR_ARGS_B(esp)
33785 mov edi, PR_ARGS_B+4(esp)
33786 mov ecx, PR_ARGS_B+4+4(esp)
33787 rep
33788 insb
33789 pop es
33790 pop edi
33791 ret
33792
33793
33794 !*===========================================================================*
33795 !* port_write *
33796 !*===========================================================================*
33797 ! PUBLIC void port_write(port_t port, phys_bytes source, unsigned bytcount);
33798 ! Transfer data from memory to (hard disk controller) port.
33799
33800 PW_ARGS = 4 + 4 + 4 ! 4 + 4 + 4
33801 ! es edi eip port src len
33802
33803 .align 16
33804 _port_write:
33805 cld
33806 push esi
33807 push ds
33808 mov ecx, FLAT_DS_SELECTOR
33809 mov ds, cx
33810 mov edx, PW_ARGS(esp) ! port to write to
33811 mov esi, PW_ARGS+4(esp) ! source addr
33812 mov ecx, PW_ARGS+4+4(esp) ! byte count
33813 shr ecx, 1 ! word count
33814 rep ! (hardware cannot handle dwords)
33815 o16 outs ! write everything
33816 pop ds
33817 pop esi
33818 ret
33819
33820
33821 !*===========================================================================*
33822 !* port_write_byte *
33823 !*===========================================================================*
33824 ! PUBLIC void port_write_byte(port_t port, phys_bytes source,
33825 ! unsigned bytcount);
33826 ! Transfer data from memory to port.
33827
33828 PW_ARGS_B = 4 + 4 + 4 ! 4 + 4 + 4
33829 ! es edi eip port src len
.Ep 478 src/kernel/klib386.s
33830
33831 _port_write_byte:
33832 cld
33833 push esi
33834 push ds
33835 mov ecx, FLAT_DS_SELECTOR
33836 mov ds, cx
33837 mov edx, PW_ARGS_B(esp)
33838 mov esi, PW_ARGS_B+4(esp)
33839 mov ecx, PW_ARGS_B+4+4(esp)
33840 rep
33841 outsb
33842 pop ds
33843 pop esi
33844 ret
33845
33846
33847 !*===========================================================================*
33848 !* lock *
33849 !*===========================================================================*
33850 ! PUBLIC void lock();
33851 ! Disable CPU interrupts.
33852
33853 .align 16
33854 _lock:
33855 cli ! disable interrupts
33856 ret
33857
33858
33859 !*===========================================================================*
33860 !* unlock *
33861 !*===========================================================================*
33862 ! PUBLIC void unlock();
33863 ! Enable CPU interrupts.
33864
33865 .align 16
33866 _unlock:
33867 sti
33868 ret
33869
33870
33871 !*==========================================================================*
33872 !* enable_irq *
33873 !*==========================================================================*/
33874 ! PUBLIC void enable_irq(unsigned irq)
33875 ! Enable an interrupt request line by clearing an 8259 bit.
33876 ! Equivalent code for irq < 8:
33877 ! out_byte(INT_CTLMASK, in_byte(INT_CTLMASK) & ~(1 << irq));
33878
33879 .align 16
33880 _enable_irq:
33881 mov ecx, 4(esp) ! irq
33882 pushf
33883 cli
33884 movb ah, ~1
33885 rolb ah, cl ! ah = ~(1 << (irq % 8))
33886 cmpb cl, 8
33887 jae enable_8 ! enable irq >= 8 at the slave 8259
33888 enable_0:
33889 inb INT_CTLMASK
.Op 479 src/kernel/klib386.s
33890 andb al, ah
33891 outb INT_CTLMASK ! clear bit at master 8259
33892 popf
33893 ret
33894 .align 4
33895 enable_8:
33896 inb INT2_CTLMASK
33897 andb al, ah
33898 outb INT2_CTLMASK ! clear bit at slave 8259
33899 popf
33900 ret
33901
33902
33903 !*==========================================================================*
33904 !* disable_irq *
33905 !*==========================================================================*/
33906 ! PUBLIC int disable_irq(unsigned irq)
33907 ! Disable an interrupt request line by setting an 8259 bit.
33908 ! Equivalent code for irq < 8:
33909 ! out_byte(INT_CTLMASK, in_byte(INT_CTLMASK) | (1 << irq));
33910 ! Returns true iff the interrupt was not already disabled.
33911
33912 .align 16
33913 _disable_irq:
33914 mov ecx, 4(esp) ! irq
33915 pushf
33916 cli
33917 movb ah, 1
33918 rolb ah, cl ! ah = (1 << (irq % 8))
33919 cmpb cl, 8
33920 jae disable_8 ! disable irq >= 8 at the slave 8259
33921 disable_0:
33922 inb INT_CTLMASK
33923 testb al, ah
33924 jnz dis_already ! already disabled?
33925 orb al, ah
33926 outb INT_CTLMASK ! set bit at master 8259
33927 popf
33928 mov eax, 1 ! disabled by this function
33929 ret
33930 disable_8:
33931 inb INT2_CTLMASK
33932 testb al, ah
33933 jnz dis_already ! already disabled?
33934 orb al, ah
33935 outb INT2_CTLMASK ! set bit at slave 8259
33936 popf
33937 mov eax, 1 ! disabled by this function
33938 ret
33939 dis_already:
33940 popf
33941 xor eax, eax ! already disabled
33942 ret
33943
33944
33945 !*===========================================================================*
33946 !* phys_copy *
33947 !*===========================================================================*
33948 ! PUBLIC void phys_copy(phys_bytes source, phys_bytes destination,
33949 ! phys_bytes bytecount);
.Ep 480 src/kernel/klib386.s
33950 ! Copy a block of physical memory.
33951
33952 PC_ARGS = 4 + 4 + 4 + 4 ! 4 + 4 + 4
33953 ! es edi esi eip src dst len
33954
33955 .align 16
33956 _phys_copy:
33957 cld
33958 push esi
33959 push edi
33960 push es
33961
33962 mov eax, FLAT_DS_SELECTOR
33963 mov es, ax
33964
33965 mov esi, PC_ARGS(esp)
33966 mov edi, PC_ARGS+4(esp)
33967 mov eax, PC_ARGS+4+4(esp)
33968
33969 cmp eax, 10 ! avoid align overhead for small counts
33970 jb pc_small
33971 mov ecx, esi ! align source, hope target is too
33972 neg ecx
33973 and ecx, 3 ! count for alignment
33974 sub eax, ecx
33975 rep
33976 eseg movsb
33977 mov ecx, eax
33978 shr ecx, 2 ! count of dwords
33979 rep
33980 eseg movs
33981 and eax, 3
33982 pc_small:
33983 xchg ecx, eax ! remainder
33984 rep
33985 eseg movsb
33986
33987 pop es
33988 pop edi
33989 pop esi
33990 ret
33991
33992
33993 !*===========================================================================*
33994 !* mem_rdw *
33995 !*===========================================================================*
33996 ! PUBLIC u16_t mem_rdw(U16_t segment, u16_t *offset);
33997 ! Load and return word at far pointer segment:offset.
33998
33999 .align 16
34000 _mem_rdw:
34001 mov cx, ds
34002 mov ds, 4(esp) ! segment
34003 mov eax, 4+4(esp) ! offset
34004 movzx eax, (eax) ! word to return
34005 mov ds, cx
34006 ret
34007
34008
34009 !*===========================================================================*
.Op 481 src/kernel/klib386.s
34010 !* reset *
34011 !*===========================================================================*
34012 ! PUBLIC void reset();
34013 ! Reset the system by loading IDT with offset 0 and interrupting.
34014
34015 _reset:
34016 lidt (idt_zero)
34017 int 3 ! anything goes, the 386 will not like it
34018 .sect .data
34019 idt_zero: .data4 0, 0
34020 .sect .text
34021
34022
34023 !*===========================================================================*
34024 !* mem_vid_copy *
34025 !*===========================================================================*
34026 ! PUBLIC void mem_vid_copy(u16 *src, unsigned dst, unsigned count);
34027 !
34028 ! Copy count characters from kernel memory to video memory. Src, dst and
34029 ! count are character (word) based video offsets and counts. If src is null
34030 ! then screen memory is blanked by filling it with blank_color.
34031
34032 MVC_ARGS = 4 + 4 + 4 + 4 ! 4 + 4 + 4
34033 ! es edi esi eip src dst ct
34034
34035 _mem_vid_copy:
34036 push esi
34037 push edi
34038 push es
34039 mov esi, MVC_ARGS(esp) ! source
34040 mov edi, MVC_ARGS+4(esp) ! destination
34041 mov edx, MVC_ARGS+4+4(esp) ! count
34042 mov es, (_vid_seg) ! destination is video segment
34043 cld ! make sure direction is up
34044 mvc_loop:
34045 and edi, (_vid_mask) ! wrap address
34046 mov ecx, edx ! one chunk to copy
34047 mov eax, (_vid_size)
34048 sub eax, edi
34049 cmp ecx, eax
34050 jbe 0f
34051 mov ecx, eax ! ecx = min(ecx, vid_size - edi)
34052 0: sub edx, ecx ! count -= ecx
34053 shl edi, 1 ! byte address
34054 test esi, esi ! source == 0 means blank the screen
34055 jz mvc_blank
34056 mvc_copy:
34057 rep ! copy words to video memory
34058 o16 movs
34059 jmp mvc_test
34060 mvc_blank:
34061 mov eax, (_blank_color) ! ax = blanking character
34062 rep
34063 o16 stos ! copy blanks to video memory
34064 !jmp mvc_test
34065 mvc_test:
34066 shr edi, 1 ! word addresses
34067 test edx, edx
34068 jnz mvc_loop
34069 mvc_done:
.Ep 482 src/kernel/klib386.s
34070 pop es
34071 pop edi
34072 pop esi
34073 ret
34074
34075
34076 !*===========================================================================*
34077 !* vid_vid_copy *
34078 !*===========================================================================*
34079 ! PUBLIC void vid_vid_copy(unsigned src, unsigned dst, unsigned count);
34080 !
34081 ! Copy count characters from video memory to video memory. Handle overlap.
34082 ! Used for scrolling, line or character insertion and deletion. Src, dst
34083 ! and count are character (word) based video offsets and counts.
34084
34085 VVC_ARGS = 4 + 4 + 4 + 4 ! 4 + 4 + 4
34086 ! es edi esi eip src dst ct
34087
34088 _vid_vid_copy:
34089 push esi
34090 push edi
34091 push es
34092 mov esi, VVC_ARGS(esp) ! source
34093 mov edi, VVC_ARGS+4(esp) ! destination
34094 mov edx, VVC_ARGS+4+4(esp) ! count
34095 mov es, (_vid_seg) ! use video segment
34096 cmp esi, edi ! copy up or down?
34097 jb vvc_down
34098 vvc_up:
34099 cld ! direction is up
34100 vvc_uploop:
34101 and esi, (_vid_mask) ! wrap addresses
34102 and edi, (_vid_mask)
34103 mov ecx, edx ! one chunk to copy
34104 mov eax, (_vid_size)
34105 sub eax, esi
34106 cmp ecx, eax
34107 jbe 0f
34108 mov ecx, eax ! ecx = min(ecx, vid_size - esi)
34109 0: mov eax, (_vid_size)
34110 sub eax, edi
34111 cmp ecx, eax
34112 jbe 0f
34113 mov ecx, eax ! ecx = min(ecx, vid_size - edi)
34114 0: sub edx, ecx ! count -= ecx
34115 shl esi, 1
34116 shl edi, 1 ! byte addresses
34117 rep
34118 eseg o16 movs ! copy video words
34119 shr esi, 1
34120 shr edi, 1 ! word addresses
34121 test edx, edx
34122 jnz vvc_uploop ! again?
34123 jmp vvc_done
34124 vvc_down:
34125 std ! direction is down
34126 lea esi, -1(esi)(edx*1) ! start copying at the top
34127 lea edi, -1(edi)(edx*1)
34128 vvc_downloop:
34129 and esi, (_vid_mask) ! wrap addresses
.Op 483 src/kernel/klib386.s
34130 and edi, (_vid_mask)
34131 mov ecx, edx ! one chunk to copy
34132 lea eax, 1(esi)
34133 cmp ecx, eax
34134 jbe 0f
34135 mov ecx, eax ! ecx = min(ecx, esi + 1)
34136 0: lea eax, 1(edi)
34137 cmp ecx, eax
34138 jbe 0f
34139 mov ecx, eax ! ecx = min(ecx, edi + 1)
34140 0: sub edx, ecx ! count -= ecx
34141 shl esi, 1
34142 shl edi, 1 ! byte addresses
34143 rep
34144 eseg o16 movs ! copy video words
34145 shr esi, 1
34146 shr edi, 1 ! word addresses
34147 test edx, edx
34148 jnz vvc_downloop ! again?
34149 cld ! C compiler expect up
34150 !jmp vvc_done
34151 vvc_done:
34152 pop es
34153 pop edi
34154 pop esi
34155 ret
34156
34157
34158 !*===========================================================================*
34159 !* level0 *
34160 !*===========================================================================*
34161 ! PUBLIC void level0(void (*func)(void))
34162 ! Call a function at permission level 0. This allows kernel tasks to do
34163 ! things that are only possible at the most privileged CPU level.
34164 !
34165 _level0:
34166 mov eax, 4(esp)
34167 mov (_level0_func), eax
34168 int LEVEL0_VECTOR
34169 ret
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/kernel/klib88.s
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
34200 #
34201 #include <minix/config.h>
34202 #include <minix/const.h>
34203 #include "const.h"
34204 #include "sconst.h"
34205 #include "protect.h"
34206
34207 ! This file contains a number of assembly code utility routines needed by the
34208 ! kernel. They are:
34209
.Ep 484 src/kernel/klib88.s
34210 .define _monitor ! exit Minix and return to the monitor
34211 .define real2prot ! switch from real to protected mode
34212 .define prot2real ! switch from protected to real mode
34213 .define _check_mem ! check a block of memory, return the valid size
34214 .define _cp_mess ! copies messages from source to destination
34215 .define _exit ! dummy for library routines
34216 .define __exit ! dummy for library routines
34217 .define ___exit ! dummy for library routines
34218 .define .fat, .trp ! dummies for library routines
34219 .define _in_byte ! read a byte from a port and return it
34220 .define _in_word ! read a word from a port and return it
34221 .define _out_byte ! write a byte to a port
34222 .define _out_word ! write a word to a port
34223 .define _port_read ! transfer data from (disk controller) port to memory
34224 .define _port_read_byte ! likewise byte by byte
34225 .define _port_write ! transfer data from memory to (disk controller) port
34226 .define _port_write_byte ! likewise byte by byte
34227 .define _lock ! disable interrupts
34228 .define _unlock ! enable interrupts
34229 .define _enable_irq ! enable an irq at the 8259 controller
34230 .define _disable_irq ! disable an irq
34231 .define _phys_copy ! copy data from anywhere to anywhere in memory
34232 .define _mem_rdw ! copy one word from [segment:offset]
34233 .define _reset ! reset the system
34234 .define _mem_vid_copy ! copy data to video ram
34235 .define _vid_vid_copy ! move data in video ram
34236 .define _level0 ! call a function at level 0
34237 .define klib_init_prot ! initialize klib functions for protected mode
34238
34239 ! The routines only guarantee to preserve the registers the C compiler
34240 ! expects to be preserved (si, di, bp, sp, segment registers, and direction
34241 ! bit in the flags), though some of the older ones preserve bx, cx and dx.
34242
34243 #define DS_286_OFFSET DS_286_INDEX*DESC_SIZE
34244 #define ES_286_OFFSET ES_286_INDEX*DESC_SIZE
34245 # define EM_XFER_FUNC 0x87
34246 #define JMP_OPCODE 0xE9 /* opcode used for patching */
34247 #define OFF_MASK 0x000F /* offset mask for phys_b -> hclick:offset */
34248 #define HCHIGH_MASK 0x0F /* h/w click mask for low byte of hi word */
34249 #define HCLOW_MASK 0xF0 /* h/w click mask for low byte of low word */
34250
34251 ! Imported functions
34252
34253 .extern p_restart
34254 .extern p_save
34255 .extern _restart
34256 .extern save
34257
34258 ! Exported variables
34259
34260 .extern kernel_cs
34261
34262 ! Imported variables
34263
34264 .extern kernel_ds
34265 .extern _irq_use
34266 .extern _blank_color
34267 .extern _gdt
34268 .extern _protected_mode
34269 .extern _vid_seg
.Op 485 src/kernel/klib88.s
34270 .extern _vid_size
34271 .extern _vid_mask
34272 .extern _level0_func
34273
34274 .text
34275 !*===========================================================================*
34276 !* monitor *
34277 !*===========================================================================*
34278 ! PUBLIC void monitor();
34279 ! Return to the monitor.
34280
34281 _monitor:
34282 call prot2real ! switch to real mode
34283 mov ax, _reboot_code+0 ! address of new parameters
34284 mov dx, _reboot_code+2
34285 mov sp, _mon_sp ! restore monitor stack pointer
34286 mov bx, _mon_ss ! monitor data segment
34287 mov ds, bx
34288 mov es, bx
34289 mov ss, bx
34290 pop di
34291 pop si
34292 pop bp
34293 retf ! return to the monitor
34294
34295
34296 #if ENABLE_BIOS_WINI
34297 !*===========================================================================*
34298 !* bios13 *
34299 !*===========================================================================*
34300 ! PUBLIC void bios13();
34301 .define _bios13
34302 _bios13: ! make a BIOS 0x13 call for disk I/O
34303 push si
34304 push di ! save C variable registers
34305 pushf ! save flags
34306
34307 call int13 ! make the actual call
34308
34309 popf ! restore flags
34310 pop di ! restore C registers
34311 pop si
34312 ret
34313
34314 ! Make a BIOS 0x13 call from protected mode
34315 p_bios13:
34316 push bp
34317 push si
34318 push di ! save C variable registers
34319 pushf ! save flags
34320 cli ! no interruptions
34321 inb INT2_CTLMASK
34322 movb ah, al
34323 inb INT_CTLMASK
34324 push ax ! save interrupt masks
34325 mov ax, _irq_use ! map of in-use IRQs
34326 and ax, #~[1<<CLOCK_IRQ] ! there is a special clock handler
34327 outb INT_CTLMASK ! enable all unused IRQs and vv.
34328 movb al, ah
34329 outb INT2_CTLMASK
.Ep 486 src/kernel/klib88.s
34330
34331 smsw ax
34332 push ax ! save machine status word
34333 call prot2real ! switch to real mode
34334
34335 call int13 ! make the actual call
34336
34337 call real2prot ! back to protected mode
34338 pop ax
34339 lmsw ax ! restore msw
34340
34341 pop ax ! restore interrupt masks
34342 outb INT_CTLMASK
34343 movb al, ah
34344 outb INT2_CTLMASK
34345 popf ! restore flags
34346 pop di
34347 pop si
34348 pop bp ! restore C variable registers
34349 ret
34350
34351 int13:
34352 mov ax, _Ax ! load parameters
34353 mov bx, _Bx
34354 mov cx, _Cx
34355 mov dx, _Dx
34356 mov es, _Es
34357 sti ! enable interrupts
34358 int 0x13 ! make the BIOS call
34359 cli ! disable interrupts
34360 mov _Ax, ax ! save results
34361 mov _Bx, bx
34362 mov _Cx, cx
34363 mov _Dx, dx
34364 mov _Es, es
34365 mov ax, ds
34366 mov es, ax ! restore es
34367 ret
34368
34369 .bss
34370 .define _Ax, _Bx, _Cx, _Dx, _Es ! 8086 register variables
34371 .comm _Ax, 2
34372 .comm _Bx, 2
34373 .comm _Cx, 2
34374 .comm _Dx, 2
34375 .comm _Es, 2
34376 .text
34377 #endif /* ENABLE_BIOS_WINI */
34378
34379
34380 !*===========================================================================*
34381 !* real2prot *
34382 !*===========================================================================*
34383 ! Switch from real to protected mode.
34384 real2prot:
34385 lgdt _gdt+GDT_SELECTOR ! set global descriptor table
34386 smsw ax
34387 mov msw, ax ! save real mode msw
34388 orb al, #0x01 ! set PE (protection enable) bit
34389 lmsw ax ! set msw, enabling protected mode
.Op 487 src/kernel/klib88.s
34390
34391 jmpf csinit, CS_SELECTOR ! set code segment selector
34392 csinit:
34393 mov ax, #DS_SELECTOR ! set data selectors
34394 mov ds, ax
34395 mov es, ax
34396 mov ss, ax
34397 lidt _gdt+IDT_SELECTOR ! set interrupt vectors
34398 andb _gdt+TSS_SELECTOR+DESC_ACCESS, #~0x02 ! clear TSS busy bit
34399 mov ax, #TSS_SELECTOR
34400 ltr ax ! set TSS register
34401
34402 movb ah, #0xDF
34403 jmp gate_A20 ! enable the A20 address line
34404
34405
34406 !*===========================================================================*
34407 !* prot2real *
34408 !*===========================================================================*
34409 ! Switch from protected to real mode.
34410 prot2real:
34411 mov save_sp, sp ! save stack pointer
34412 cmp _processor, #386 ! is this a 386?
34413 jae p2r386
34414 p2r286:
34415 mov _gdt+ES_286_OFFSET+DESC_BASE, #0x0400
34416 movb _gdt+ES_286_OFFSET+DESC_BASE_MIDDLE, #0x00
34417 mov ax, #ES_286_SELECTOR
34418 mov es, ax ! BIOS data segment
34419 eseg mov 0x0067, #real ! set return from shutdown address
34420 cseg mov ax, kernel_cs
34421 eseg mov 0x0069, ax
34422 movb al, #0x8F
34423 outb 0x70 ! select CMOS byte 0x0F (disable NMI)
34424 jmp .+2
34425 movb al, #0x0A
34426 outb 0x71 ! set shutdown code to 0x0A "jump far"
34427 jmp p_reset ! cause a processor shutdown
34428 p2r386:
34429 lidt idt_vectors ! real mode interrupt vectors
34430 push _gdt+CS_SELECTOR+0
34431 push _gdt+DS_SELECTOR+0 ! save CS and DS limits
34432 mov _gdt+CS_SELECTOR+0, #0xFFFF
34433 mov _gdt+DS_SELECTOR+0, #0xFFFF ! set 64k limits
34434 jmpf cs64k, CS_SELECTOR ! reload selectors
34435 cs64k: mov ax, #DS_SELECTOR
34436 mov ds, ax
34437 mov es, ax
34438 mov ss, ax
34439 pop _gdt+DS_SELECTOR+0
34440 pop _gdt+CS_SELECTOR+0 ! restore CS and DS limits
34441 .data1 0x0F,0x20,0xC0 ! mov eax, cr0
34442 mov ax, msw ! restore real mode (16 bits) msw
34443 .data1 0x0F,0x22,0xC0 ! mov cr0, eax
34444 .data1 0xEA ! jmpf real, "kernel_cs"
34445 .data2 real
34446 kernel_cs:
34447 .data2 0
34448 real:
34449 cseg mov ax, kernel_ds ! reload data segment registers
.Ep 488 src/kernel/klib88.s
34450 mov ds, ax
34451 mov es, ax
34452 mov ss, ax
34453 mov sp, save_sp ! restore stack
34454
34455 movb ah, #0xDD
34456 !jmp gate_A20 ! disable the A20 address line
34457
34458 ! Enable (ah = 0xDF) or disable (ah = 0xDD) the A20 address line.
34459 gate_A20:
34460 call kb_wait
34461 movb al, #0xD1 ! Tell keyboard that a command is coming
34462 outb 0x64
34463 call kb_wait
34464 movb al, ah ! Enable or disable code
34465 outb 0x60
34466 call kb_wait
34467 mov ax, #25 ! 25 microsec delay for slow keyboard chip
34468 0: out 0xED ! Write to an unused port (1us)
34469 dec ax
34470 jne 0b
34471 ret
34472 kb_wait:
34473 inb 0x64
34474 testb al, #0x02 ! Keyboard input buffer full?
34475 jnz kb_wait ! If so, wait
34476 ret
34477
34478
34479 !*===========================================================================*
34480 !* check_mem *
34481 !*===========================================================================*
34482 ! PUBLIC phys_bytes check_mem(phys_bytes base, phys_bytes size);
34483 ! Check a block of memory, return the amount valid.
34484 ! Only every 16th byte is checked.
34485 ! This only works in protected mode.
34486 ! An initial size of 0 means everything.
34487 ! This really should do some alias checks.
34488
34489 PCM_DENSITY = 256 ! resolution of check
34490 ! the shift logic depends on this being 256
34491 TEST1PATTERN = 0x55 ! memory test pattern 1
34492 TEST2PATTERN = 0xAA ! memory test pattern 2
34493
34494 _check_mem:
34495 pop bx
34496 pop _gdt+DS_286_OFFSET+DESC_BASE
34497 pop ax ! pop base into base of source descriptor
34498 movb _gdt+DS_286_OFFSET+DESC_BASE_MIDDLE,al
34499 pop cx ! byte count in dx:cx
34500 pop dx
34501 sub sp,#4+4
34502 push bx
34503 push ds
34504
34505 sub ax,ax ! prepare for early exit
34506 test dx,#0xFF00
34507 jnz cm_1exit ! cannot handle bases above 16M
34508 movb cl,ch ! divide size by 256 and discard high byte
34509 movb ch,dl
.Op 489 src/kernel/klib88.s
34510 push cx ! save divided size
34511 sub bx,bx ! test bytes at bases of segments
34512 cm_loop:
34513 mov ax,#DS_286_SELECTOR
34514 mov ds,ax
34515 movb dl,#TEST1PATTERN
34516 xchgb dl,(bx) ! write test pattern, remember original value
34517 xchgb dl,(bx) ! restore original value, read test pattern
34518 cmpb dl,#TEST1PATTERN ! must agree if good real memory
34519 jnz cm_exit ! if different, memory is unusable
34520 movb dl,#TEST2PATTERN
34521 xchgb dl,(bx)
34522 xchgb dl,(bx)
34523 cmpb dl,#TEST2PATTERN
34524 jnz cm_exit
34525 ! next segment, test for wraparound at 16M
34526 ! assuming es == old ds
34527 eseg add _gdt+DS_286_OFFSET+DESC_BASE,#PCM_DENSITY
34528 eseg adcb _gdt+DS_286_OFFSET+DESC_BASE_MIDDLE,#0
34529 loopnz cm_loop
34530
34531 cm_exit:
34532 pop ax
34533 sub ax,cx ! verified size in multiples of PCM_DENSITY
34534 cm_1exit:
34535 movb dl,ah ! convert to phys_bytes in dx:ax
34536 subb dh,dh
34537 movb ah,al
34538 movb al,dh
34539 pop ds
34540 ret
34541
34542
34543 !*===========================================================================*
34544 !* cp_mess *
34545 !*===========================================================================*
34546 ! PUBLIC void cp_mess(int src, phys_clicks src_clicks, vir_bytes src_offset,
34547 ! phys_clicks dst_clicks, vir_bytes dst_offset);
34548 ! This routine makes a fast copy of a message from anywhere in the address
34549 ! space to anywhere else. It also copies the source address provided as a
34550 ! parameter to the call into the first word of the destination message.
34551 !
34552 ! Note that the message size, "Msize" is in WORDS (not bytes) and must be set
34553 ! correctly. Changing the definition of message in the type file and not
34554 ! changing it here will lead to total disaster.
34555
34556 _cp_mess:
34557 cld
34558 push es ! save es
34559 push ds ! save ds
34560 mov bx,sp ! index off bx because machine cannot use sp
34561 push si ! save si
34562 push di ! save di
34563
34564 mov ax,12(bx) ! destination click
34565 #if HCLICK_SHIFT > CLICK_SHIFT
34566 #error /* Small click sizes are not supported (right shift will lose bits). */
34567 #endif
34568 #if HCLICK_SHIFT < CLICK_SHIFT
34569 movb cl,#CLICK_SHIFT-HCLICK_SHIFT
.Ep 490 src/kernel/klib88.s
34570 shl ax,cl ! destination segment
34571 #endif
34572 mov es,ax
34573 mov di,14(bx) ! offset of destination message
34574
34575 ! Be careful not to destroy ds before we are finished with the bx pointer.
34576 ! We are using bx and not the more natural bp to save pushing bp.