setup.c
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上传日期:2013-04-10
资源大小:33168k
文件大小:15k
- /*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1995 Linus Torvalds
- * Copyright (C) 1995 Waldorf Electronics
- * Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001 Ralf Baechle
- * Copyright (C) 1996 Stoned Elipot
- * Copyright (C) 2000, 2001 Maciej W. Rozycki
- */
- #include <linux/config.h>
- #include <linux/errno.h>
- #include <linux/hdreg.h>
- #include <linux/init.h>
- #include <linux/ioport.h>
- #include <linux/sched.h>
- #include <linux/kernel.h>
- #include <linux/mm.h>
- #include <linux/module.h>
- #include <linux/stddef.h>
- #include <linux/string.h>
- #include <linux/unistd.h>
- #include <linux/slab.h>
- #include <linux/user.h>
- #include <linux/utsname.h>
- #include <linux/a.out.h>
- #include <linux/tty.h>
- #include <linux/bootmem.h>
- #include <linux/blk.h>
- #include <linux/ide.h>
- #include <linux/timex.h>
- #include <asm/asm.h>
- #include <asm/bootinfo.h>
- #include <asm/cachectl.h>
- #include <asm/cpu.h>
- #include <asm/io.h>
- #include <asm/ptrace.h>
- #include <asm/system.h>
- #ifndef CONFIG_SMP
- struct cpuinfo_mips cpu_data[1];
- #endif
- /*
- * There are several bus types available for MIPS machines. "RISC PC"
- * type machines have ISA, EISA, VLB or PCI available, DECstations
- * have Turbochannel or Q-Bus, SGI has GIO, there are lots of VME
- * boxes ...
- * This flag is set if a EISA slots are available.
- */
- #ifdef CONFIG_EISA
- int EISA_bus = 0;
- #endif
- struct screen_info screen_info;
- extern struct fd_ops no_fd_ops;
- struct fd_ops *fd_ops;
- #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
- extern struct ide_ops no_ide_ops;
- struct ide_ops *ide_ops;
- #endif
- extern void * __rd_start, * __rd_end;
- extern struct rtc_ops no_rtc_ops;
- struct rtc_ops *rtc_ops;
- #ifdef CONFIG_PC_KEYB
- extern struct kbd_ops no_kbd_ops;
- struct kbd_ops *kbd_ops;
- #endif
- /*
- * Setup information
- *
- * These are initialized so they are in the .data section
- */
- unsigned long mips_machtype = MACH_UNKNOWN;
- unsigned long mips_machgroup = MACH_GROUP_UNKNOWN;
- struct boot_mem_map boot_mem_map;
- unsigned char aux_device_present;
- extern char _ftext, _etext, _fdata, _edata, _end;
- static char command_line[CL_SIZE];
- char saved_command_line[CL_SIZE];
- extern char arcs_cmdline[CL_SIZE];
- /*
- * mips_io_port_base is the begin of the address space to which x86 style
- * I/O ports are mapped.
- */
- const unsigned long mips_io_port_base = -1;
- EXPORT_SYMBOL(mips_io_port_base);
- /*
- * isa_slot_offset is the address where E(ISA) busaddress 0 is is mapped
- * for the processor.
- */
- unsigned long isa_slot_offset;
- EXPORT_SYMBOL(isa_slot_offset);
- extern void sgi_sysinit(void);
- extern void SetUpBootInfo(void);
- extern void loadmmu(void);
- extern asmlinkage void start_kernel(void);
- extern void prom_init(int, char **, char **, int *);
- static struct resource code_resource = { "Kernel code" };
- static struct resource data_resource = { "Kernel data" };
- asmlinkage void __init
- init_arch(int argc, char **argv, char **envp, int *prom_vec)
- {
- /* Determine which MIPS variant we are running on. */
- cpu_probe();
- prom_init(argc, argv, envp, prom_vec);
- #ifdef CONFIG_SGI_IP22
- sgi_sysinit();
- #endif
- cpu_report();
- /*
- * Determine the mmu/cache attached to this machine,
- * then flush the tlb and caches. On the r4xx0
- * variants this also sets CP0_WIRED to zero.
- */
- loadmmu();
- /* Disable coprocessors and set FPU for 16/32 FPR register model */
- clear_cp0_status(ST0_CU1|ST0_CU2|ST0_CU3|ST0_KX|ST0_SX|ST0_FR);
- set_cp0_status(ST0_CU0);
- start_kernel();
- }
- void __init add_memory_region(phys_t start, phys_t size,
- long type)
- {
- int x = boot_mem_map.nr_map;
- if (x == BOOT_MEM_MAP_MAX) {
- printk("Ooops! Too many entries in the memory map!n");
- return;
- }
- boot_mem_map.map[x].addr = start;
- boot_mem_map.map[x].size = size;
- boot_mem_map.map[x].type = type;
- boot_mem_map.nr_map++;
- }
- static void __init print_memory_map(void)
- {
- int i;
- for (i = 0; i < boot_mem_map.nr_map; i++) {
- printk(" memory: %08Lx @ %08Lx ",
- (u64) boot_mem_map.map[i].size,
- (u64) boot_mem_map.map[i].addr);
- switch (boot_mem_map.map[i].type) {
- case BOOT_MEM_RAM:
- printk("(usable)n");
- break;
- case BOOT_MEM_ROM_DATA:
- printk("(ROM data)n");
- break;
- case BOOT_MEM_RESERVED:
- printk("(reserved)n");
- break;
- default:
- printk("type %lun", boot_mem_map.map[i].type);
- break;
- }
- }
- }
- static inline void parse_mem_cmdline(void)
- {
- char c = ' ', *to = command_line, *from = saved_command_line;
- unsigned long start_at, mem_size;
- int len = 0;
- int usermem = 0;
- printk("Determined physical RAM map:n");
- print_memory_map();
- for (;;) {
- /*
- * "mem=XXX[kKmM]" defines a memory region from
- * 0 to <XXX>, overriding the determined size.
- * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
- * <YYY> to <YYY>+<XXX>, overriding the determined size.
- */
- if (c == ' ' && !memcmp(from, "mem=", 4)) {
- if (to != command_line)
- to--;
- /*
- * If a user specifies memory size, we
- * blow away any automatically generated
- * size.
- */
- if (usermem == 0) {
- boot_mem_map.nr_map = 0;
- usermem = 1;
- }
- mem_size = memparse(from + 4, &from);
- if (*from == '@')
- start_at = memparse(from + 1, &from);
- else
- start_at = 0;
- add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
- }
- c = *(from++);
- if (!c)
- break;
- if (CL_SIZE <= ++len)
- break;
- *(to++) = c;
- }
- *to = ' ';
- if (usermem) {
- printk("User-defined physical RAM map:n");
- print_memory_map();
- }
- }
- void __init setup_arch(char **cmdline_p)
- {
- void atlas_setup(void);
- void baget_setup(void);
- void cobalt_setup(void);
- void ddb_setup(void);
- void decstation_setup(void);
- void deskstation_setup(void);
- void jazz_setup(void);
- void sni_rm200_pci_setup(void);
- void ip22_setup(void);
- void ev96100_setup(void);
- void malta_setup(void);
- void sead_setup(void);
- void ikos_setup(void);
- void momenco_ocelot_setup(void);
- void momenco_ocelot_g_setup(void);
- void nino_setup(void);
- void nec_osprey_setup(void);
- void nec_eagle_setup(void);
- void zao_capcella_setup(void);
- void jmr3927_setup(void);
- void it8172_setup(void);
- void swarm_setup(void);
- void hp_setup(void);
- unsigned long bootmap_size;
- unsigned long start_pfn, max_pfn, max_low_pfn, first_usable_pfn;
- #ifdef CONFIG_BLK_DEV_INITRD
- unsigned long tmp;
- unsigned long* initrd_header;
- #endif
- int i;
- #ifdef CONFIG_BLK_DEV_FD
- fd_ops = &no_fd_ops;
- #endif
- #ifdef CONFIG_BLK_DEV_IDE
- ide_ops = &no_ide_ops;
- #endif
- #ifdef CONFIG_PC_KEYB
- kbd_ops = &no_kbd_ops;
- #endif
- rtc_ops = &no_rtc_ops;
- switch(mips_machgroup)
- {
- #ifdef CONFIG_BAGET_MIPS
- case MACH_GROUP_BAGET:
- baget_setup();
- break;
- #endif
- #ifdef CONFIG_MIPS_COBALT
- case MACH_GROUP_COBALT:
- cobalt_setup();
- break;
- #endif
- #ifdef CONFIG_DECSTATION
- case MACH_GROUP_DEC:
- decstation_setup();
- break;
- #endif
- #ifdef CONFIG_MIPS_ATLAS
- case MACH_GROUP_UNKNOWN:
- atlas_setup();
- break;
- #endif
- #ifdef CONFIG_MIPS_JAZZ
- case MACH_GROUP_JAZZ:
- jazz_setup();
- break;
- #endif
- #ifdef CONFIG_MIPS_MALTA
- case MACH_GROUP_UNKNOWN:
- malta_setup();
- break;
- #endif
- #ifdef CONFIG_MOMENCO_OCELOT
- case MACH_GROUP_MOMENCO:
- momenco_ocelot_setup();
- break;
- #endif
- #ifdef CONFIG_MOMENCO_OCELOT_G
- case MACH_GROUP_MOMENCO:
- momenco_ocelot_g_setup();
- break;
- #endif
- #ifdef CONFIG_MIPS_SEAD
- case MACH_GROUP_UNKNOWN:
- sead_setup();
- break;
- #endif
- #ifdef CONFIG_SGI_IP22
- /* As of now this is only IP22. */
- case MACH_GROUP_SGI:
- ip22_setup();
- break;
- #endif
- #ifdef CONFIG_SNI_RM200_PCI
- case MACH_GROUP_SNI_RM:
- sni_rm200_pci_setup();
- break;
- #endif
- #ifdef CONFIG_DDB5074
- case MACH_GROUP_NEC_DDB:
- ddb_setup();
- break;
- #endif
- #ifdef CONFIG_DDB5476
- case MACH_GROUP_NEC_DDB:
- ddb_setup();
- break;
- #endif
- #ifdef CONFIG_DDB5477
- case MACH_GROUP_NEC_DDB:
- ddb_setup();
- break;
- #endif
- #ifdef CONFIG_CPU_VR41XX
- case MACH_GROUP_NEC_VR41XX:
- switch (mips_machtype) {
- #ifdef CONFIG_NEC_OSPREY
- case MACH_NEC_OSPREY:
- nec_osprey_setup();
- break;
- #endif
- #ifdef CONFIG_NEC_EAGLE
- case MACH_NEC_EAGLE:
- nec_eagle_setup();
- break;
- #endif
- #ifdef CONFIG_ZAO_CAPCELLA
- case MACH_ZAO_CAPCELLA:
- zao_capcella_setup();
- break;
- #endif
- }
- break;
- #endif
- #ifdef CONFIG_MIPS_EV96100
- case MACH_GROUP_GALILEO:
- ev96100_setup();
- break;
- #endif
- #ifdef CONFIG_MIPS_EV64120
- case MACH_GROUP_GALILEO:
- ev64120_setup();
- break;
- #endif
- #if defined(CONFIG_MIPS_IVR) || defined(CONFIG_MIPS_ITE8172)
- case MACH_GROUP_ITE:
- case MACH_GROUP_GLOBESPAN:
- it8172_setup();
- break;
- #endif
- #ifdef CONFIG_NINO
- case MACH_GROUP_PHILIPS:
- nino_setup();
- break;
- #endif
- #ifdef CONFIG_MIPS_PB1000
- case MACH_GROUP_ALCHEMY:
- au1000_setup();
- break;
- #endif
- #ifdef CONFIG_MIPS_PB1100
- case MACH_GROUP_ALCHEMY:
- au1100_setup();
- break;
- #endif
- #ifdef CONFIG_MIPS_PB1500
- case MACH_GROUP_ALCHEMY:
- au1500_setup();
- break;
- #endif
- #ifdef CONFIG_TOSHIBA_JMR3927
- case MACH_GROUP_TOSHIBA:
- jmr3927_setup();
- break;
- #endif
- #ifdef CONFIG_SIBYTE_SWARM
- case MACH_GROUP_SIBYTE:
- swarm_setup();
- break;
- #endif
- #ifdef CONFIG_HP_LASERJET
- case MACH_GROUP_HP_LJ:
- hp_setup();
- break;
- #endif
- default:
- panic("Unsupported architecture");
- }
- strncpy(command_line, arcs_cmdline, sizeof command_line);
- command_line[sizeof command_line - 1] = 0;
- strcpy(saved_command_line, command_line);
- *cmdline_p = command_line;
- parse_mem_cmdline();
- #define PFN_UP(x) (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
- #define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
- #define PFN_PHYS(x) ((x) << PAGE_SHIFT)
- #define MAXMEM HIGHMEM_START
- #define MAXMEM_PFN PFN_DOWN(MAXMEM)
- #ifdef CONFIG_BLK_DEV_INITRD
- tmp = (((unsigned long)&_end + PAGE_SIZE-1) & PAGE_MASK) - 8;
- if (tmp < (unsigned long)&_end)
- tmp += PAGE_SIZE;
- initrd_header = (unsigned long *)tmp;
- if (initrd_header[0] == 0x494E5244) {
- initrd_start = (unsigned long)&initrd_header[2];
- initrd_end = initrd_start + initrd_header[1];
- }
- start_pfn = PFN_UP(__pa((&_end)+(initrd_end - initrd_start) + PAGE_SIZE));
- #else
- /*
- * Partially used pages are not usable - thus
- * we are rounding upwards.
- */
- start_pfn = PFN_UP(__pa(&_end));
- #endif /* CONFIG_BLK_DEV_INITRD */
- /* Find the highest page frame number we have available. */
- max_pfn = 0;
- first_usable_pfn = -1UL;
- for (i = 0; i < boot_mem_map.nr_map; i++) {
- unsigned long start, end;
- if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
- continue;
- start = PFN_UP(boot_mem_map.map[i].addr);
- end = PFN_DOWN(boot_mem_map.map[i].addr
- + boot_mem_map.map[i].size);
- if (start >= end)
- continue;
- if (end > max_pfn)
- max_pfn = end;
- if (start < first_usable_pfn) {
- if (start > start_pfn) {
- first_usable_pfn = start;
- } else if (end > start_pfn) {
- first_usable_pfn = start_pfn;
- }
- }
- }
- /*
- * Determine low and high memory ranges
- */
- max_low_pfn = max_pfn;
- if (max_low_pfn > MAXMEM_PFN) {
- max_low_pfn = MAXMEM_PFN;
- #ifndef CONFIG_HIGHMEM
- /* Maximum memory usable is what is directly addressable */
- printk(KERN_WARNING "Warning only %ldMB will be used.n",
- MAXMEM>>20);
- printk(KERN_WARNING "Use a HIGHMEM enabled kernel.n");
- #endif
- }
- #ifdef CONFIG_HIGHMEM
- /*
- * Crude, we really should make a better attempt at detecting
- * highstart_pfn
- */
- highstart_pfn = highend_pfn = max_pfn;
- if (max_pfn > MAXMEM_PFN) {
- highstart_pfn = MAXMEM_PFN;
- printk(KERN_NOTICE "%ldMB HIGHMEM available.n",
- (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT));
- }
- #endif
- /* Initialize the boot-time allocator with low memory only. */
- bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);
- /*
- * Register fully available low RAM pages with the bootmem allocator.
- */
- for (i = 0; i < boot_mem_map.nr_map; i++) {
- unsigned long curr_pfn, last_pfn, size;
- /*
- * Reserve usable memory.
- */
- if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
- continue;
- /*
- * We are rounding up the start address of usable memory:
- */
- curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
- if (curr_pfn >= max_low_pfn)
- continue;
- if (curr_pfn < start_pfn)
- curr_pfn = start_pfn;
- /*
- * ... and at the end of the usable range downwards:
- */
- last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
- + boot_mem_map.map[i].size);
- if (last_pfn > max_low_pfn)
- last_pfn = max_low_pfn;
- /*
- * Only register lowmem part of lowmem segment with bootmem.
- */
- size = last_pfn - curr_pfn;
- if (curr_pfn > PFN_DOWN(HIGHMEM_START))
- continue;
- if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START))
- size = PFN_DOWN(HIGHMEM_START) - curr_pfn;
- if (!size)
- continue;
- /*
- * ... finally, did all the rounding and playing
- * around just make the area go away?
- */
- if (last_pfn <= curr_pfn)
- continue;
- /* Register lowmem ranges */
- free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
- }
- /* Reserve the bootmap memory. */
- reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);
- #ifdef CONFIG_BLK_DEV_INITRD
- /* Board specific code should have set up initrd_start and initrd_end */
- ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
- if (&__rd_start != &__rd_end) {
- initrd_start = (unsigned long)&__rd_start;
- initrd_end = (unsigned long)&__rd_end;
- }
- initrd_below_start_ok = 1;
- if (initrd_start) {
- unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start);
- printk("Initial ramdisk at: 0x%p (%lu bytes)n",
- (void *)initrd_start,
- initrd_size);
- if (PHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
- printk("initrd extends beyond end of memory "
- "(0x%lx > 0x%p)ndisabling initrdn",
- PHYSADDR(initrd_end),
- PFN_PHYS(max_low_pfn));
- initrd_start = initrd_end = 0;
- }
- }
- #endif /* CONFIG_BLK_DEV_INITRD */
- paging_init();
- code_resource.start = virt_to_bus(&_ftext);
- code_resource.end = virt_to_bus(&_etext) - 1;
- data_resource.start = virt_to_bus(&_fdata);
- data_resource.end = virt_to_bus(&_edata) - 1;
- /*
- * Request address space for all standard RAM.
- */
- for (i = 0; i < boot_mem_map.nr_map; i++) {
- struct resource *res;
- unsigned long addr_pfn, end_pfn;
- res = alloc_bootmem(sizeof(struct resource));
- switch (boot_mem_map.map[i].type) {
- case BOOT_MEM_RAM:
- case BOOT_MEM_ROM_DATA:
- res->name = "System RAM";
- break;
- case BOOT_MEM_RESERVED:
- default:
- res->name = "reserved";
- }
- addr_pfn = PFN_UP(boot_mem_map.map[i].addr);
- end_pfn = PFN_UP(boot_mem_map.map[i].addr+boot_mem_map.map[i].size);
- if (addr_pfn > max_low_pfn)
- continue;
- res->start = boot_mem_map.map[i].addr;
- if (end_pfn < max_low_pfn) {
- res->end = res->start + boot_mem_map.map[i].size - 1;
- } else {
- res->end = max_low_pfn - 1;
- }
- res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
- request_resource(&iomem_resource, res);
- /*
- * We dont't know which RAM region contains kernel data,
- * so we try it repeatedly and let the resource manager
- * test it.
- */
- request_resource(res, &code_resource);
- request_resource(res, &data_resource);
- }
- }
- static int __init fpu_disable(char *s)
- {
- mips_cpu.options &= ~MIPS_CPU_FPU;
- return 1;
- }
- __setup("nofpu", fpu_disable);