head.S
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- /*
- * arch/s390/kernel/head.S
- *
- * S390 version
- * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
- * Author(s): Hartmut Penner (hp@de.ibm.com),
- * Martin Schwidefsky (schwidefsky@de.ibm.com),
- * Rob van der Heij (rvdhei@iae.nl)
- *
- * There are 5 different IPL methods
- * 1) load the image directly into ram at address 0 and do an PSW restart
- * 2) linload will load the image from address 0x10000 to memory 0x10000
- * and start the code thru LPSW 0x0008000080010000 (VM only, deprecated)
- * 3) generate the tape ipl header, store the generated image on a tape
- * and ipl from it
- * In case of SL tape you need to IPL 5 times to get past VOL1 etc
- * 4) generate the vm reader ipl header, move the generated image to the
- * VM reader (use option NOH!) and do a ipl from reader (VM only)
- * 5) direct call of start by the SALIPL loader
- * We use the cpuid to distinguish between VM and native ipl
- * params for kernel are pushed to 0x10400 (see setup.h)
- Changes:
- Okt 25 2000 <rvdheij@iae.nl>
- added code to skip HDR and EOF to allow SL tape IPL (5 retries)
- changed first CCW from rewind to backspace block
- */
- #include <linux/config.h>
- #include <asm/setup.h>
- #include <asm/lowcore.h>
- #ifndef CONFIG_IPL
- .org 0
- .long 0x00080000,0x80000000+startup # Just a restart PSW
- #else
- #ifdef CONFIG_IPL_TAPE
- #define IPL_BS 1024
- .org 0
- .long 0x00080000,0x80000000+iplstart # The first 24 bytes are loaded
- .long 0x27000000,0x60000001 # by ipl to addresses 0-23.
- .long 0x02000000,0x20000000+IPL_BS # (a PSW and two CCWs).
- .long 0x00000000,0x00000000 # external old psw
- .long 0x00000000,0x00000000 # svc old psw
- .long 0x00000000,0x00000000 # program check old psw
- .long 0x00000000,0x00000000 # machine check old psw
- .long 0x00000000,0x00000000 # io old psw
- .long 0x00000000,0x00000000
- .long 0x00000000,0x00000000
- .long 0x00000000,0x00000000
- .long 0x000a0000,0x00000058 # external new psw
- .long 0x000a0000,0x00000060 # svc new psw
- .long 0x000a0000,0x00000068 # program check new psw
- .long 0x000a0000,0x00000070 # machine check new psw
- .long 0x00080000,0x80000000+.Lioint # io new psw
- .org 0x100
- #
- # subroutine for loading from tape
- # Paramters:
- # R1 = device number
- # R2 = load address
- .Lloader:
- st %r14,.Lldret
- la %r3,.Lorbread # r3 = address of orb
- la %r5,.Lirb # r5 = address of irb
- st %r2,.Lccwread+4 # initialize CCW data addresses
- lctl %c6,%c6,.Lcr6
- slr %r2,%r2
- .Lldlp:
- la %r6,3 # 3 retries
- .Lssch:
- ssch 0(%r3) # load chunk of IPL_BS bytes
- bnz .Llderr
- .Lw4end:
- bas %r14,.Lwait4io
- tm 8(%r5),0x82 # do we have a problem ?
- bnz .Lrecov
- slr %r7,%r7
- icm %r7,3,10(%r5) # get residual count
- lcr %r7,%r7
- la %r7,IPL_BS(%r7) # IPL_BS-residual=#bytes read
- ar %r2,%r7 # add to total size
- tm 8(%r5),0x01 # found a tape mark ?
- bnz .Ldone
- l %r0,.Lccwread+4 # update CCW data addresses
- ar %r0,%r7
- st %r0,.Lccwread+4
- b .Lldlp
- .Ldone:
- l %r14,.Lldret
- br %r14 # r2 contains the total size
- .Lrecov:
- bas %r14,.Lsense # do the sensing
- bct %r6,.Lssch # dec. retry count & branch
- b .Llderr
- #
- # Sense subroutine
- #
- .Lsense:
- st %r14,.Lsnsret
- la %r7,.Lorbsense
- ssch 0(%r7) # start sense command
- bnz .Llderr
- bas %r14,.Lwait4io
- l %r14,.Lsnsret
- tm 8(%r5),0x82 # do we have a problem ?
- bnz .Llderr
- br %r14
- #
- # Wait for interrupt subroutine
- #
- .Lwait4io:
- lpsw .Lwaitpsw
- .Lioint:
- c %r1,0xb8 # compare subchannel number
- bne .Lwait4io
- tsch 0(%r5)
- slr %r0,%r0
- tm 8(%r5),0x82 # do we have a problem ?
- bnz .Lwtexit
- tm 8(%r5),0x04 # got device end ?
- bz .Lwait4io
- .Lwtexit:
- br %r14
- .Llderr:
- lpsw .Lcrash
- .align 8
- .Lorbread:
- .long 0x00000000,0x0080ff00,.Lccwread
- .align 8
- .Lorbsense:
- .long 0x00000000,0x0080ff00,.Lccwsense
- .align 8
- .Lccwread:
- .long 0x02200000+IPL_BS,0x00000000
- .Lccwsense:
- .long 0x04200001,0x00000000
- .Lwaitpsw:
- .long 0x020a0000,0x80000000+.Lioint
- .Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
- .Lcr6: .long 0xff000000
- .align 8
- .Lcrash:.long 0x000a0000,0x00000000
- .Lldret:.long 0
- .Lsnsret: .long 0
- #endif /* CONFIG_IPL_TAPE */
- #ifdef CONFIG_IPL_VM
- #define IPL_BS 0x730
- .org 0
- .long 0x00080000,0x80000000+iplstart # The first 24 bytes are loaded
- .long 0x02000018,0x60000050 # by ipl to addresses 0-23.
- .long 0x02000068,0x60000050 # (a PSW and two CCWs).
- .fill 80-24,1,0x40 # bytes 24-79 are discarded !!
- .long 0x020000f0,0x60000050 # The next 160 byte are loaded
- .long 0x02000140,0x60000050 # to addresses 0x18-0xb7
- .long 0x02000190,0x60000050 # They form the continuation
- .long 0x020001e0,0x60000050 # of the CCW program started
- .long 0x02000230,0x60000050 # by ipl and load the range
- .long 0x02000280,0x60000050 # 0x0f0-0x730 from the image
- .long 0x020002d0,0x60000050 # to the range 0x0f0-0x730
- .long 0x02000320,0x60000050 # in memory. At the end of
- .long 0x02000370,0x60000050 # the channel program the PSW
- .long 0x020003c0,0x60000050 # at location 0 is loaded.
- .long 0x02000410,0x60000050 # Initial processing starts
- .long 0x02000460,0x60000050 # at 0xf0 = iplstart.
- .long 0x020004b0,0x60000050
- .long 0x02000500,0x60000050
- .long 0x02000550,0x60000050
- .long 0x020005a0,0x60000050
- .long 0x020005f0,0x60000050
- .long 0x02000640,0x60000050
- .long 0x02000690,0x60000050
- .long 0x020006e0,0x20000050
- .org 0xf0
- #
- # subroutine for loading cards from the reader
- #
- .Lloader:
- la %r3,.Lorb # r2 = address of orb into r2
- la %r5,.Lirb # r4 = address of irb
- la %r6,.Lccws
- la %r7,20
- .Linit:
- st %r2,4(%r6) # initialize CCW data addresses
- la %r2,0x50(%r2)
- la %r6,8(%r6)
- bct 7,.Linit
- lctl %c6,%c6,.Lcr6 # set IO subclass mask
- slr %r2,%r2
- .Lldlp:
- ssch 0(%r3) # load chunk of 1600 bytes
- bnz .Llderr
- .Lwait4irq:
- mvc 0x78(8),.Lnewpsw # set up IO interrupt psw
- lpsw .Lwaitpsw
- .Lioint:
- c %r1,0xb8 # compare subchannel number
- bne .Lwait4irq
- tsch 0(%r5)
- slr %r0,%r0
- ic %r0,8(%r5) # get device status
- chi %r0,8 # channel end ?
- be .Lcont
- chi %r0,12 # channel end + device end ?
- be .Lcont
- l %r0,4(%r5)
- s %r0,8(%r3) # r0/8 = number of ccws executed
- mhi %r0,10 # *10 = number of bytes in ccws
- lh %r3,10(%r5) # get residual count
- sr %r0,%r3 # #ccws*80-residual=#bytes read
- ar %r2,%r0
-
- br %r14 # r2 contains the total size
- .Lcont:
- ahi %r2,0x640 # add 0x640 to total size
- la %r6,.Lccws
- la %r7,20
- .Lincr:
- l %r0,4(%r6) # update CCW data addresses
- ahi %r0,0x640
- st %r0,4(%r6)
- ahi %r6,8
- bct 7,.Lincr
- b .Lldlp
- .Llderr:
- lpsw .Lcrash
- .align 8
- .Lorb: .long 0x00000000,0x0080ff00,.Lccws
- .Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
- .Lcr6: .long 0xff000000
- .Lloadp:.long 0,0
- .align 8
- .Lcrash:.long 0x000a0000,0x00000000
- .Lnewpsw:
- .long 0x00080000,0x80000000+.Lioint
- .Lwaitpsw:
- .long 0x020a0000,0x80000000+.Lioint
- .align 8
- .Lccws: .rept 19
- .long 0x02600050,0x00000000
- .endr
- .long 0x02200050,0x00000000
- #endif /* CONFIG_IPL_VM */
- iplstart:
- lh %r1,0xb8 # test if subchannel number
- bct %r1,.Lnoload # is valid
- l %r1,0xb8 # load ipl subchannel number
- la %r2,IPL_BS # load start address
- bas %r14,.Lloader # load rest of ipl image
- larl %r12,_pstart # pointer to parameter area
- st %r1,IPL_DEVICE+4-PARMAREA(%r12) # store ipl device number
- #
- # load parameter file from ipl device
- #
- .Lagain1:
- l %r2,INITRD_START+4-PARMAREA(%r12)# use ramdisk location as temp
- bas %r14,.Lloader # load parameter file
- ltr %r2,%r2 # got anything ?
- bz .Lnopf
- chi %r2,895
- bnh .Lnotrunc
- la %r2,895
- .Lnotrunc:
- l %r4,INITRD_START+4-PARMAREA(%r12)
- clc 0(3,%r4),.L_hdr # if it is HDRx
- bz .Lagain1 # skip dataset header
- clc 0(3,%r4),.L_eof # if it is EOFx
- bz .Lagain1 # skip dateset trailer
- la %r5,0(%r4,%r2)
- lr %r3,%r2
- .Lidebc:
- tm 0(%r5),0x80 # high order bit set ?
- bo .Ldocv # yes -> convert from EBCDIC
- ahi %r5,-1
- bct %r3,.Lidebc
- b .Lnocv
- .Ldocv:
- l %r3,.Lcvtab
- tr 0(256,%r4),0(%r3) # convert parameters to ascii
- tr 256(256,%r4),0(%r3)
- tr 512(256,%r4),0(%r3)
- tr 768(122,%r4),0(%r3)
- .Lnocv: la %r3,COMMAND_LINE-PARMAREA(%r12) # load adr. of command line
- mvc 0(256,%r3),0(%r4)
- mvc 256(256,%r3),256(%r4)
- mvc 512(256,%r3),512(%r4)
- mvc 768(122,%r3),768(%r4)
- slr %r0,%r0
- b .Lcntlp
- .Ldelspc:
- ic %r0,0(%r2,%r3)
- chi %r0,0x20 # is it a space ?
- be .Lcntlp
- ahi %r2,1
- b .Leolp
- .Lcntlp:
- brct %r2,.Ldelspc
- .Leolp:
- slr %r0,%r0
- stc %r0,0(%r2,%r3) # terminate buffer
- .Lnopf:
- #
- # load ramdisk from ipl device
- #
- .Lagain2:
- l %r2,INITRD_START+4-PARMAREA(%r12)# load adr. of ramdisk
- bas %r14,.Lloader # load ramdisk
- st %r2,INITRD_SIZE+4-PARMAREA(%r12) # store size of ramdisk
- ltr %r2,%r2
- bnz .Lrdcont
- st %r2,INITRD_START+4-PARMAREA(%r12)# no ramdisk found, null it
- .Lrdcont:
- l %r2,INITRD_START-PARMAREA(%r12)
- clc 0(3,%r2),.L_hdr # skip HDRx and EOFx
- bz .Lagain2
- clc 0(3,%r2),.L_eof
- bz .Lagain2
- #ifdef CONFIG_IPL_VM
- #
- # reset files in VM reader
- #
- stidp __LC_CPUID # store cpuid
- tm __LC_CPUID,0xff # running VM ?
- bno .Lnoreset
- la %r2,.Lreset
- lhi %r3,26
- .long 0x83230008
- .Lnoreset:
- #endif
-
- #
- # everything loaded, go for it
- #
- .Lnoload:
- l %r1,.Lstartup
- br %r1
- .Lstartup: .long startup
- .Lcvtab:.long _ebcasc # ebcdic to ascii table
- .Lreset:.byte 0xc3,0xc8,0xc1,0xd5,0xc7,0xc5,0x40,0xd9,0xc4,0xd9,0x40
- .byte 0xc1,0xd3,0xd3,0x40,0xd2,0xc5,0xc5,0xd7,0x40,0xd5,0xd6
- .byte 0xc8,0xd6,0xd3,0xc4 # "change rdr all keep nohold"
- .L_eof: .long 0xc5d6c600 /* C'EOF' */
- .L_hdr: .long 0xc8c4d900 /* C'HDR' */
- #endif /* CONFIG_IPL */
- #
- # SALIPL loader support. Based on a patch by Rob van der Heij.
- # This entry point is called directly from the SALIPL loader and
- # doesn't need a builtin ipl record.
- #
- .org 0x800
- .globl start
- start:
- stm %r0,%r15,0x07b0 # store registers
- basr %r12,%r0
- .base:
- l %r11,.parm
- l %r8,.cmd # pointer to command buffer
- ltr %r9,%r9 # do we have SALIPL parameters?
- bp .sk8x8
- mvc 0(64,%r8),0x00b0 # copy saved registers
- xc 64(240-64,%r8),0(%r8) # remainder of buffer
- tr 0(64,%r8),.lowcase
- b .gotr
- .sk8x8:
- mvc 0(240,%r8),0(%r9) # copy iplparms into buffer
- .gotr:
- l %r10,.tbl # EBCDIC to ASCII table
- tr 0(240,%r8),0(%r10)
- stidp __LC_CPUID # Are we running on VM maybe
- cli __LC_CPUID,0xff
- bnz .test
- .long 0x83300060 # diag 3,0,x'0060' - storage size
- b .done
- .test:
- mvc 0x68(8),.pgmnw # set up pgm check handler
- l %r2,.fourmeg
- lr %r3,%r2
- bctr %r3,%r0 # 4M-1
- .loop: iske %r0,%r3
- ar %r3,%r2
- .pgmx:
- sr %r3,%r2
- la %r3,1(%r3)
- .done:
- l %r1,.memsize
- st %r3,4(%r1)
- slr %r0,%r0
- st %r0,INITRD_SIZE+4-PARMAREA(%r11)
- st %r0,INITRD_START+4-PARMAREA(%r11)
- j startup # continue with startup
- .tbl: .long _ebcasc # translate table
- .cmd: .long COMMAND_LINE # address of command line buffer
- .parm: .long PARMAREA
- .fourmeg: .long 0x00400000 # 4M
- .pgmnw: .long 0x00080000,.pgmx
- .memsize: .long memory_size
- .lowcase:
- .byte 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07
- .byte 0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f
- .byte 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17
- .byte 0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f
- .byte 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27
- .byte 0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f
- .byte 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37
- .byte 0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f
- .byte 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47
- .byte 0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f
- .byte 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57
- .byte 0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f
- .byte 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67
- .byte 0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f
- .byte 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77
- .byte 0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f
- .byte 0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87
- .byte 0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f
- .byte 0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97
- .byte 0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f
- .byte 0xa0,0xa1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7
- .byte 0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf
- .byte 0xb0,0xb1,0xb2,0xb3,0xb4,0xb5,0xb6,0xb7
- .byte 0xb8,0xb9,0xba,0xbb,0xbc,0xbd,0xbe,0xbf
- .byte 0xc0,0x81,0x82,0x83,0x84,0x85,0x86,0x87 # .abcdefg
- .byte 0x88,0x89,0xca,0xcb,0xcc,0xcd,0xce,0xcf # hi
- .byte 0xd0,0x91,0x92,0x93,0x94,0x95,0x96,0x97 # .jklmnop
- .byte 0x98,0x99,0xda,0xdb,0xdc,0xdd,0xde,0xdf # qr
- .byte 0xe0,0xe1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7 # ..stuvwx
- .byte 0xa8,0xa9,0xea,0xeb,0xec,0xed,0xee,0xef # yz
- .byte 0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7
- .byte 0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff
- #
- # startup-code at 0x10000, running in real mode
- # this is called either by the ipl loader or directly by PSW restart
- # or linload or SALIPL
- #
- .org 0x10000
- startup:basr %r13,0 # get base
- .LPG1: sll %r13,1 # remove high order bit
- srl %r13,1
- lhi %r1,1 # mode 1 = esame
- slr %r0,%r0 # set cpuid to zero
- sigp %r1,%r0,0x12 # switch to esame mode
- sam64 # switch to 64 bit mode
- lctlg %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
- larl %r12,_pstart # pointer to parameter area
- # move IPL device to lowcore
- mvc __LC_IPLDEV(4),IPL_DEVICE+4-PARMAREA(%r12)
- # set program check new psw mask
- mvc __LC_PGM_NEW_PSW(8),.Lpcmsk-.LPG1(%r13)
- #
- # find memory chunks.
- #
- larl %r1,.Lchkmem # set program check address
- stg %r1,__LC_PGM_NEW_PSW+8
- la %r1,1 # test in increments of 128KB
- sllg %r1,%r1,17
- larl %r3,memory_chunk
- slgr %r4,%r4 # set start of chunk to zero
- slgr %r5,%r5 # set end of chunk to zero
- slr %r6,%r6 # set access code to zero
- .Lloop:
- tprot 0(%r5),0 # test protection of first byte
- ipm %r7
- srl %r7,28
- clr %r6,%r7 # compare cc with last access code
- je .Lsame
- clgr %r4,%r5 # chunk size > 0?
- je .Lsize0
- stg %r4,0(%r3) # store start address of chunk
- lgr %r0,%r5
- slgr %r0,%r4
- stg %r0,8(%r3) # store size of chunk
- st %r6,20(%r3) # store type of chunk
- la %r3,24(%r3)
- lgr %r4,%r5 # set start to end
- larl %r8,memory_size
- stg %r5,0(%r8) # store memory size
- .Lsize0:
- lr %r6,%r7 # set access code to last cc
- .Lsame:
- algr %r5,%r1 # add 128KB to end of chunk
- brc 12,.Lloop
- .Lchkmem: # > 16EB or tprot got a program check
- clgr %r4,%r5 # chunk size > 0?
- je .Ldonemem
- stg %r4,0(%r3) # store start address of chunk
- lgr %r0,%r5
- slgr %r0,%r4
- stg %r0,8(%r3) # store size of chunk
- st %r6,20(%r3) # store type of chunk
- la %r3,24(%r3)
- lgr %r4,%r5
- larl %r8,memory_size
- stg %r5,0(%r8) # store memory size
- #
- # Running native the HSA is located at 2GB and we will get an
- # addressing exception trying to access it. We have to restart
- # the scan at 2GB to find out if the machine has more than 2GB.
- #
- lghi %r4,1
- sllg %r4,%r4,31
- clgr %r5,%r4
- jhe .Ldonemem
- lgr %r5,%r4
- j .Lloop
- .Ldonemem:
- larl %r12,machine_flags
- #
- # find out if we are running under VM
- #
- stidp __LC_CPUID # store cpuid
- tm __LC_CPUID,0xff # running under VM ?
- bno 0f-.LPG1(%r13)
- oi 7(%r12),1 # set VM flag
- 0: lh %r0,__LC_CPUID+4 # get cpu version
- chi %r0,0x7490 # running on a P/390 ?
- bne 1f-.LPG1(%r13)
- oi 7(%r12),4 # set P/390 flag
- 1:
- #
- # find out if we have the MVPG instruction
- #
- la %r1,0f-.LPG1(%r13) # set program check address
- stg %r1,__LC_PGM_NEW_PSW+8
- sgr %r0,%r0
- lghi %r1,0
- lghi %r2,0
- mvpg %r1,%r2 # test MVPG instruction
- oi 7(%r12),16 # set MVPG flag
- 0:
- lpswe .Lentry-.LPG1(13) # jump to _stext in primary-space,
- # virtual and never return ...
- .align 16
- .Lentry:.quad 0x0000000180000000,_stext
- .Lctl: .quad 0x04b50002 # cr0: various things
- .quad 0 # cr1: primary space segment table
- .quad .Lduct # cr2: dispatchable unit control table
- .quad 0 # cr3: instruction authorization
- .quad 0 # cr4: instruction authorization
- .quad 0 # cr5: various things
- .quad 0 # cr6: I/O interrupts
- .quad 0 # cr7: secondary space segment table
- .quad 0 # cr8: access registers translation
- .quad 0 # cr9: tracing off
- .quad 0 # cr10: tracing off
- .quad 0 # cr11: tracing off
- .quad 0 # cr12: tracing off
- .quad 0 # cr13: home space segment table
- .quad 0xc0000000 # cr14: machine check handling off
- .quad 0 # cr15: linkage stack operations
- .Lpcmsk:.quad 0x0000000180000000
- .L4malign:.quad 0xffffffffffc00000
- .Lscan2g:.quad 0x80000000 + 0x20000 - 8 # 2GB + 128K - 8
- .org PARMAREA-64
- .Lduct: .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- #
- # params at 10400 (setup.h)
- #
- .org PARMAREA
- .global _pstart
- _pstart:
- .quad 0 # IPL_DEVICE
- .quad RAMDISK_ORIGIN # INITRD_START
- .quad RAMDISK_SIZE # INITRD_SIZE
- .org COMMAND_LINE
- .byte "root=/dev/ram0 ro"
- .byte 0
- .org 0x11000
- .global _pend
- _pend:
- #ifdef CONFIG_SHARED_KERNEL
- .org 0x100000
- #endif
-
- #
- # startup-code, running in virtual mode
- #
- .globl _stext
- _stext: basr %r13,0 # get base
- .LPG2:
- #
- # Setup stack
- #
- larl %r15,init_task_union
- aghi %r15,16384 # init_task_union + 16384
- stg %r15,__LC_KERNEL_STACK # set end of kernel stack
- aghi %r15,-160
- xc 0(8,%r15),0(%r15) # set backchain to zero
- #
- # clear bss memory
- #
- larl %r2,__bss_start # start of bss segment
- larl %r3,_end # end of bss segment
- sgr %r3,%r2 # length of bss
- sgr %r4,%r4 #
- sgr %r5,%r5 # set src,length and pad to zero
- mvcle %r2,%r4,0 # clear mem
- jo .-4 # branch back, if not finish
- # check control registers
- stctg %c0,%c15,0(%r15)
- oi 6(%r15),0x20 # enable sigp external interrupts
- oi 4(%r15),0x10 # switch on low address proctection
- lctlg %c0,%c15,0(%r15)
- #
- lam 0,15,.Laregs-.LPG2(%r13) # load access regs needed by uaccess
- brasl %r14,start_kernel # go to C code
- #
- # We returned from start_kernel ?!? PANIK
- #
- basr %r13,0
- lpswe .Ldw-.(%r13) # load disabled wait psw
- #
- .align 8
- .Ldw: .quad 0x0002000180000000,0x0000000000000000
- .Laregs: .long 0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0