/* * 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, 1996, 1997, 1998, 1999, 2000 Ralf Baechle * Copyright (C) 1996 Stoned Elipot * Copyright (C) 2000 Maciej W. Rozycki */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_BLK_DEV_RAM #include #endif #include #ifdef CONFIG_RTC #include #endif #include #include #include #include #include #include #include #include #ifdef CONFIG_SGI_IP22 #include #endif struct mips_cpuinfo boot_cpu_data = { NULL, NULL, 0 }; /* * Not all of the MIPS CPUs have the "wait" instruction available. Moreover, * the implementation of the "wait" feature differs between CPU families. This * points to the function that implements CPU specific wait. * The wait instruction stops the pipeline and reduces the power consumption of * the CPU very much. */ void (*cpu_wait)(void) = NULL; /* * Do we have a cyclecounter available? */ char cyclecounter_available; /* * 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. */ int EISA_bus = 0; struct screen_info screen_info; #ifdef CONFIG_BLK_DEV_FD extern struct fd_ops no_fd_ops; struct fd_ops *fd_ops; #endif #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 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[COMMAND_LINE_SIZE]; char saved_command_line[COMMAND_LINE_SIZE]; extern char arcs_cmdline[COMMAND_LINE_SIZE]; /* * The board specific setup routine sets irq_setup to point to a board * specific setup routine. */ void (*irq_setup)(void); /* * mips_io_port_base is the begin of the address space to which x86 style * I/O ports are mapped. */ unsigned long 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; 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" }; /* * Probe whether cpu has config register by trying to play with * alternate cache bit and see whether it matters. * It's used by cpu_probe to distinguish between R3000A and R3081. */ static inline int cpu_has_confreg(void) { #ifdef CONFIG_CPU_R3000 extern unsigned long r3k_cache_size(unsigned long); unsigned long size1, size2; unsigned long cfg = read_32bit_cp0_register(CP0_CONF); size1 = r3k_cache_size(ST0_ISC); write_32bit_cp0_register(CP0_CONF, cfg^CONF_AC); size2 = r3k_cache_size(ST0_ISC); write_32bit_cp0_register(CP0_CONF, cfg); return size1 != size2; #else return 0; #endif } /* declaration of the global struct */ struct mips_cpu mips_cpu = {PRID_IMP_UNKNOWN, CPU_UNKNOWN, 0, 0, 0, {0,0,0,0}, {0,0,0,0}, {0,0,0,0}, {0,0,0,0}}; /* Shortcut for assembler access to mips_cpu.options */ int *cpuoptions = &mips_cpu.options; #define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4KTLB \ | MIPS_CPU_COUNTER | MIPS_CPU_CACHE_CDEX) static inline void cpu_probe(void) { unsigned long config1; mips_cpu.processor_id = read_32bit_cp0_register(CP0_PRID); switch (mips_cpu.processor_id & 0xff00) { case PRID_IMP_R2000: mips_cpu.cputype = CPU_R2000; mips_cpu.isa_level = MIPS_CPU_ISA_I; mips_cpu.options = MIPS_CPU_TLB; mips_cpu.tlbsize = 64; break; case PRID_IMP_R3000: if ((mips_cpu.processor_id & 0xff) == PRID_REV_R3000A) if (cpu_has_confreg()) mips_cpu.cputype = CPU_R3081E; else mips_cpu.cputype = CPU_R3000A; else mips_cpu.cputype = CPU_R3000; mips_cpu.isa_level = MIPS_CPU_ISA_I; mips_cpu.options = MIPS_CPU_TLB; mips_cpu.tlbsize = 64; break; case PRID_IMP_R4000: if ((mips_cpu.processor_id & 0xff) == PRID_REV_R4400) mips_cpu.cputype = CPU_R4400SC; else mips_cpu.cputype = CPU_R4000SC; mips_cpu.isa_level = MIPS_CPU_ISA_III; mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | MIPS_CPU_WATCH | MIPS_CPU_VCE; mips_cpu.tlbsize = 48; break; case PRID_IMP_R4600: mips_cpu.cputype = CPU_R4600; mips_cpu.isa_level = MIPS_CPU_ISA_III; mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU; mips_cpu.tlbsize = 48; break; /* * This processor doesn't have an MMU, so it's not "real easy" to * run Linux on it. It is left purely for documentation. * case PRID_IMP_R4650: mips_cpu.cputype = CPU_R4650; mips_cpu.isa_level = MIPS_CPU_ISA_III; mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU; mips_cpu.tlbsize = 48; break; */ case PRID_IMP_R3912: mips_cpu.cputype = CPU_R3912; mips_cpu.isa_level = MIPS_CPU_ISA_I; mips_cpu.options = MIPS_CPU_TLB; mips_cpu.tlbsize = 32; break; case PRID_IMP_R4700: mips_cpu.cputype = CPU_R4700; mips_cpu.isa_level = MIPS_CPU_ISA_III; mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR; mips_cpu.tlbsize = 48; break; case PRID_IMP_R5000: mips_cpu.cputype = CPU_R5000; mips_cpu.isa_level = MIPS_CPU_ISA_IV; mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR; mips_cpu.tlbsize = 48; break; case PRID_IMP_R5432: mips_cpu.cputype = CPU_R5432; mips_cpu.isa_level = MIPS_CPU_ISA_IV; mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR; mips_cpu.tlbsize = 48; break; case PRID_IMP_NEVADA: mips_cpu.cputype = CPU_NEVADA; mips_cpu.isa_level = MIPS_CPU_ISA_IV; mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | MIPS_CPU_DIVEC; mips_cpu.tlbsize = 48; mips_cpu.icache.ways = 2; mips_cpu.dcache.ways = 2; break; case PRID_IMP_R6000: mips_cpu.cputype = CPU_R6000; mips_cpu.isa_level = MIPS_CPU_ISA_II; mips_cpu.options = MIPS_CPU_TLB | MIPS_CPU_FPU; mips_cpu.tlbsize = 32; break; case PRID_IMP_R6000A: mips_cpu.cputype = CPU_R6000A; mips_cpu.isa_level = MIPS_CPU_ISA_II; mips_cpu.options = MIPS_CPU_TLB | MIPS_CPU_FPU; mips_cpu.tlbsize = 32; break; case PRID_IMP_RM7000: mips_cpu.cputype = CPU_RM7000; mips_cpu.isa_level = MIPS_CPU_ISA_IV; mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR; break; case PRID_IMP_R8000: mips_cpu.cputype = CPU_R8000; mips_cpu.isa_level = MIPS_CPU_ISA_IV; mips_cpu.options = MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_FPU | MIPS_CPU_32FPR; mips_cpu.tlbsize = 384; /* has wierd TLB: 3-way x 128 */ break; case PRID_IMP_R10000: mips_cpu.cputype = CPU_R10000; mips_cpu.isa_level = MIPS_CPU_ISA_IV; mips_cpu.options = MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_FPU | MIPS_CPU_32FPR | MIPS_CPU_COUNTER | MIPS_CPU_WATCH; mips_cpu.tlbsize = 64; break; #ifdef CONFIG_CPU_MIPS32 case PRID_IMP_4KC: mips_cpu.cputype = CPU_4KC; mips_cpu.isa_level = MIPS_CPU_ISA_M32; mips_cpu.options = MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4KTLB | MIPS_CPU_COUNTER | MIPS_CPU_DIVEC | MIPS_CPU_WATCH; config1 = read_mips32_cp0_config1(); if (config1 & (1 << 3)) mips_cpu.options |= MIPS_CPU_WATCH; if (config1 & (1 << 2)) mips_cpu.options |= MIPS_CPU_MIPS16; if (config1 & 1) mips_cpu.options |= MIPS_CPU_FPU; mips_cpu.scache.flags = MIPS_CACHE_NOT_PRESENT; break; case PRID_IMP_5KC: mips_cpu.cputype = CPU_5KC; mips_cpu.isa_level = MIPS_CPU_ISA_M64; mips_cpu.options = MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4KTLB | MIPS_CPU_COUNTER | MIPS_CPU_DIVEC | MIPS_CPU_WATCH; config1 = read_mips32_cp0_config1(); if (config1 & (1 << 3)) mips_cpu.options |= MIPS_CPU_WATCH; if (config1 & (1 << 2)) mips_cpu.options |= MIPS_CPU_MIPS16; if (config1 & 1) mips_cpu.options |= MIPS_CPU_FPU; mips_cpu.scache.flags = MIPS_CACHE_NOT_PRESENT; break; #endif default: mips_cpu.cputype = CPU_UNKNOWN; } } asmlinkage void __init init_arch(int argc, char **argv, char **envp, int *prom_vec) { unsigned int s; /* Determine which MIPS variant we are running on. */ cpu_probe(); prom_init(argc, argv, envp, prom_vec); #ifdef CONFIG_SGI_IP22 sgi_sysinit(); #endif /* * 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 FPRs */ s = read_32bit_cp0_register(CP0_STATUS); s &= ~(ST0_CU1|ST0_CU2|ST0_CU3|ST0_KX|ST0_SX|ST0_FR); s |= ST0_CU0; write_32bit_cp0_register(CP0_STATUS, s); start_kernel(); } static void __init default_irq_setup(void) { panic("Unknown machtype in init_IRQ"); } void __init add_memory_region(unsigned long start, unsigned long 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 ", boot_mem_map.map[i].size, 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 %lu\n", 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 , overriding the determined size. * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from * to +, 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 (COMMAND_LINE_SIZE <= ++len) break; *(to++) = c; } *to = '\0'; 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 ddb_setup(void); void decstation_setup(void); void deskstation_setup(void); void jazz_setup(void); void sni_rm200_pci_setup(void); void sgi_setup(void); void ev96100_setup(void); void malta_setup(void); void momenco_ocelot_setup(void); void nino_setup(void); #ifdef CONFIG_BLK_DEV_INITRD extern void * __rd_start, * __rd_end; #endif unsigned long bootmap_size; unsigned long start_pfn, max_pfn; int i; /* Save defaults for configuration-dependent routines. */ irq_setup = default_irq_setup; #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_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_SGI_IP22 /* As of now this is only IP22. */ case MACH_GROUP_SGI: sgi_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_MIPS_EV96100 case MACH_GROUP_GALILEO: ev96100_setup(); break; #endif #ifdef CONFIG_MIPS_EV64120 case MACH_GROUP_GALILEO: ev64120_setup(); break; #endif #ifdef CONFIG_MIPS_ITE8172 case MACH_GROUP_ITE: it8172_setup(); break; #endif #ifdef CONFIG_NINO case MACH_GROUP_PHILIPS: nino_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) /* * Partially used pages are not usable - thus * we are rounding upwards. */ start_pfn = PFN_UP(__pa(&_end)); /* Find the highest page frame number we have available. */ max_pfn = 0; 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; } /* Initialize the boot-time allocator. */ bootmap_size = init_bootmem(start_pfn, max_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_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_pfn) last_pfn = max_pfn; /* * ... finally, did all the rounding and playing * around just make the area go away? */ if (last_pfn <= curr_pfn) continue; size = last_pfn - curr_pfn; free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size)); } /* Reserve the bootmap memory. */ reserve_bootmem(PFN_PHYS(start_pfn), bootmap_size); #ifdef CONFIG_NINO ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0); initrd_start = (unsigned long)&__rd_start; initrd_end = (unsigned long)&__rd_end; initrd_below_start_ok = 1; #endif #if 0 #ifdef CONFIG_BLK_DEV_INITRD #error "Fixme, I'm broken." 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]; initrd_below_start_ok = 1; if (initrd_end > memory_end) { printk("initrd extends beyond end of memory " "(0x%08lx > 0x%08lx)\ndisabling initrd\n", initrd_end,memory_end); initrd_start = 0; } else *memory_start_p = initrd_end; } #endif /* CONFIG_BLK_DEV_INITRD */ #endif /* 0 */ 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; 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"; } res->start = boot_mem_map.map[i].addr; res->end = res->start + boot_mem_map.map[i].size - 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); } } void r3081_wait(void) { unsigned long cfg = read_32bit_cp0_register(CP0_CONF); write_32bit_cp0_register(CP0_CONF, cfg|CONF_HALT); } void r4k_wait(void) { __asm__(".set\tmips3\n\t" "wait\n\t" ".set\tmips0"); }