diff options
Diffstat (limited to 'arch/mips/kernel/setup.c')
| -rw-r--r-- | arch/mips/kernel/setup.c | 328 |
1 files changed, 207 insertions, 121 deletions
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c index f5037fbd7..30304abda 100644 --- a/arch/mips/kernel/setup.c +++ b/arch/mips/kernel/setup.c @@ -2,10 +2,12 @@ * linux/arch/mips/kernel/setup.c * * Copyright (C) 1995 Linus Torvalds - * Copyright (C) 1995 Ralf Baechle + * Copyright (C) 1995, 1996 Ralf Baechle + * Copyright (C) 1996 Stoned Elipot */ - +#include <linux/config.h> #include <linux/errno.h> +#include <linux/ioport.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/mm.h> @@ -14,15 +16,20 @@ #include <linux/unistd.h> #include <linux/ptrace.h> #include <linux/malloc.h> -#include <linux/ldt.h> #include <linux/user.h> +#include <linux/utsname.h> #include <linux/a.out.h> #include <linux/tty.h> +#ifdef CONFIG_BLK_DEV_RAM +#include <linux/blk.h> +#endif #include <asm/asm.h> #include <asm/bootinfo.h> +#include <asm/cache.h> +#include <asm/io.h> #include <asm/vector.h> -#include <asm/segment.h> +#include <asm/uaccess.h> #include <asm/stackframe.h> #include <asm/system.h> @@ -31,177 +38,256 @@ */ struct feature *feature; -#ifdef CONFIG_ACER_PICA_61 -void acer_pica_61_handle_int(void); -struct feature acer_pica_61_feature = { - acer_pica_61_handle_int -}; -#endif -#ifdef CONFIG_DECSTATION -void decstation_handle_handle_int(void); -struct feature decstation_feature = { - decstation_handle_handle_int -}; -#endif -#ifdef CONFIG_DESKSTATION_RPC44 -void deskstation_rpc44_handle_int(void); -struct feature deskstation_rpc44_feature = { - deskstation_rpc44_handle_int -}; -#endif -#ifdef CONFIG_DESKSTATION_TYNE -void deskstation_tyne_handle_int(void); -struct feature deskstation_tyne_feature = { - deskstation_tyne_handle_int -}; -#endif -#ifdef CONFIG_MIPS_MAGNUM_4000 -void mips_magnum_4000_handle_int(void); -struct feature mips_magnum_4000_feature = { - mips_magnum_4000_handle_int -}; -#endif +/* + * What to do to keep the caches consistent with memory + * We don't use the normal cacheflush routine to keep Tyne caches happier. + */ +void (*fd_cacheflush)(const void *addr, size_t size); /* - * Tell us the machine setup.. + * Not all of the MIPS CPUs have the "wait" instruction available. This + * is set to true if it is available. The wait instruction stops the + * pipeline and reduces the power consumption of the CPU very much. */ -char wait_available; /* set if the "wait" instruction available */ +char wait_available; /* - * Bus types .. + * There are several bus types available for MIPS machines. "RISC PC" + * type machines have ISA, EISA or PCI available, some DECstations have + * Turbochannel, SGI has GIO, there are lots of VME boxes ... + * This flag is set if a EISA slots are available. */ int EISA_bus = 0; /* - * Setup options + * Do a hardware reset. */ -struct drive_info_struct drive_info; -struct screen_info screen_info = SCREEN_INFO; +void (*hard_reset_now)(void); + +/* + * Milo passes some information to the kernel that looks like as if it + * had been returned by a Intel PC BIOS. Milo doesn't fill the passed + * drive_info and Linux can find out about this anyway, so I'm going to + * remove this sometime. screen_info contains information about the + * resolution of the text screen. For VGA graphics based machine this + * information is being use to continue the screen output just below + * the BIOS printed text and with the same text resolution. + */ +struct drive_info_struct drive_info = DEFAULT_DRIVE_INFO; +struct screen_info screen_info = DEFAULT_SCREEN_INFO; + +/* + * setup informations + * + * These are intialized so they are in the .data section + */ +unsigned long mips_memory_upper = KSEG0; /* this is set by kernel_entry() */ +unsigned long mips_cputype = CPU_UNKNOWN; +unsigned long mips_machtype = MACH_UNKNOWN; /* this is set by bi_EarlySnarf() */ +unsigned long mips_machgroup = MACH_GROUP_UNKNOWN; /* this is set by bi_EarlySnarf() */ +unsigned long mips_tlb_entries = 48; /* this is set by bi_EarlySnarf() */ +unsigned long mips_vram_base = KSEG0; -unsigned char aux_device_present; -extern int ramdisk_size; extern int root_mountflags; extern int _end; extern char empty_zero_page[PAGE_SIZE]; /* - * Initialise this structure so that it will be placed in the - * .data section of the object file - */ -struct bootinfo boot_info = BOOT_INFO; - -/* * This is set up by the setup-routine at boot-time */ #define PARAM empty_zero_page -#if 0 -#define ORIG_ROOT_DEV (*(unsigned short *) (PARAM+0x1FC)) -#define AUX_DEVICE_INFO (*(unsigned char *) (PARAM+0x1FF)) -#endif +#define LOADER_TYPE (*(unsigned char *) (PARAM+0x210)) +#define INITRD_START (*(unsigned long *) (PARAM+0x218)) +#define INITRD_SIZE (*(unsigned long *) (PARAM+0x21c)) static char command_line[CL_SIZE] = { 0, }; + char saved_command_line[CL_SIZE]; -#if 0 /* - * Code for easy access to new style bootinfo - * - * Parameter: tag -- taglist entry - * - * returns : (tag *) -- pointer to taglist entry, NULL for not found + * The board specific setup routine sets irq_setup to point to a board + * specific setup routine. */ -tag * -bi_TagFind(enum bi_tag tag) +void (*irq_setup)(void); + +static void default_irq_setup(void) { - /* TBD */ - return 0; + panic("Unknown machtype in init_IRQ"); } -/* - * Only for taglist creators (bootloaders) - * - * Parameter: tag -- (enum bi_tag) taglist entry - * - * returns : 1 -- success - * 0 -- failure - */ -int -bi_TagAdd(enum bi_tag tag, unsigned long size, void *tagdata) +static void default_fd_cacheflush(const void *addr, size_t size) { - /* TBD */ - return 0; } -#endif /* 0 */ -void setup_arch(char **cmdline_p, - unsigned long * memory_start_p, unsigned long * memory_end_p) +static asmlinkage void +default_cacheflush(unsigned long addr, unsigned long nbytes, unsigned int flags) { - unsigned long memory_start, memory_end; + /* + * Someone didn't set his cacheflush() handler ... + */ + panic("default_cacheflush() called.\n"); +} +asmlinkage void (*cacheflush)(unsigned long addr, unsigned long nbytes, unsigned int flags) = default_cacheflush; - switch(boot_info.machtype) - { -#ifdef CONFIG_ACER_PICA_61 - case MACH_ACER_PICA_61: - feature = &acer_pica_61_feature; +static __inline__ void +cpu_init(void) +{ + asmlinkage void handle_reserved(void); + void mips1_cpu_init(void); + void mips2_cpu_init(void); + void mips3_cpu_init(void); + void mips4_cpu_init(void); + int i; + + /* + * Setup default vectors + */ + for (i=0;i<=31;i++) + set_except_vector(i, handle_reserved); + + switch(mips_cputype) { +#ifdef CONFIG_CPU_R3000 + case CPU_R2000: case CPU_R3000: case CPU_R3000A: case CPU_R3041: + case CPU_R3051: case CPU_R3052: case CPU_R3081: case CPU_R3081E: + mips1_cpu_init(); + break; +#endif +#ifdef CONFIG_CPU_R6000 + case CPU_R6000: case CPU_R6000A: + mips2_cpu_init(); break; #endif -#ifdef CONFIG_DECSTATION - case MACH_DECSTATION: - feature = &decstation_feature; +#ifdef CONFIG_CPU_R4X00 + case CPU_R4000MC: case CPU_R4400MC: case CPU_R4000SC: + case CPU_R4400SC: case CPU_R4000PC: case CPU_R4400PC: + case CPU_R4200: case CPU_R4300: /* case CPU_R4640: */ + case CPU_R4600: case CPU_R4700: + mips3_cpu_init(); break; #endif -#ifdef CONFIG_DESKSTATION_RPC - case MACH_DESKSTATION_RPC: - feature = &deskstation_rpc44_feature; +#ifdef CONFIG_CPU_R8000 + case CPU_R8000: case CPU_R5000: + printk("Detected unsupported CPU type %s.\n", + cpu_names[mips_cputype]); + panic("Can't handle CPU"); break; #endif -#ifdef CONFIG_DESKSTATION_TYNE - case MACH_DESKSTATION_TYNE: - feature = &deskstation_tyne_feature; +#ifdef CONFIG_CPU_R10000 + case CPU_R10000: + mips4_cpu_init(); +#endif + case CPU_UNKNOWN: + default: + panic("Unknown or unsupported CPU type"); + } +} + +void setup_arch(char **cmdline_p, + unsigned long * memory_start_p, unsigned long * memory_end_p) +{ + unsigned long memory_end; + tag* atag; + void decstation_setup(void); + void deskstation_setup(void); + void jazz_setup(void); + void sni_rm200_pci_setup(void); + + /* Perhaps a lot of tags are not getting 'snarfed' - */ + /* please help yourself */ + + atag = bi_TagFind(tag_cputype); + memcpy(&mips_cputype, TAGVALPTR(atag), atag->size); + + cpu_init(); + + atag = bi_TagFind(tag_vram_base); + memcpy(&mips_vram_base, TAGVALPTR(atag), atag->size); + + irq_setup = default_irq_setup; + fd_cacheflush = default_fd_cacheflush; + + switch(mips_machgroup) + { +#ifdef CONFIG_MIPS_DECSTATION + case MACH_GROUP_DEC: + decstation_setup(); break; #endif -#ifdef CONFIG_MIPS_MAGNUM_4000 - case MACH_MIPS_MAGNUM_4000: - feature = &mips_magnum_4000_feature; +#if defined(CONFIG_MIPS_ARC) +/* Perhaps arch/mips/deskstation should be renommed arch/mips/arc. + * For now CONFIG_MIPS_ARC means DeskStation. -Stoned. + */ + case MACH_GROUP_ARC: + deskstation_setup(); + break; +#endif +#ifdef CONFIG_MIPS_JAZZ + case MACH_GROUP_JAZZ: + jazz_setup(); + break; +#endif +#ifdef CONFIG_SNI_RM200_PCI + case MACH_GROUP_SNI_RM: + sni_rm200_pci_setup(); break; #endif default: panic("Unsupported architecture"); } -#if 0 - ROOT_DEV = ORIG_ROOT_DEV; -#else - ROOT_DEV = 0x021c; /* fd0H1440 */ -/* ROOT_DEV = 0x0101; */ /* ram */ -/* ROOT_DEV = 0x00ff; */ /* NFS */ + atag = bi_TagFind(tag_drive_info); + memcpy(&drive_info, TAGVALPTR(atag), atag->size); + + memory_end = mips_memory_upper; + /* + * Due to prefetching and similar mechanism the CPU sometimes + * generates addresses beyond the end of memory. We leave the size + * of one cache line at the end of memory unused to make shure we + * don't catch this type of bus errors. + */ + memory_end -= 32; + memory_end &= PAGE_MASK; + +#ifdef CONFIG_BLK_DEV_RAM + rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; + rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0); + rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0); #endif - memcpy(&drive_info, &boot_info.drive_info, sizeof(drive_info)); -#if 0 - aux_device_present = AUX_DEVICE_INFO; +#ifdef CONFIG_MAX_16M + /* + * There is a quite large number of different PC chipset based boards + * available and so I include this option here just in case ... + */ + if (memory_end > PAGE_OFFSET + 16*1024*1024) + memory_end = PAGE_OFFSET + 16*1024*1024; #endif - memory_end = boot_info.memupper; - memory_end &= PAGE_MASK; - ramdisk_size = boot_info.ramdisk_size; - if (boot_info.mount_root_rdonly) - root_mountflags |= MS_RDONLY; - memory_start = (unsigned long) &_end; - memory_start += (ramdisk_size << 10); + atag= bi_TagFind(tag_screen_info); + if (atag) + memcpy(&screen_info, TAGVALPTR(atag), atag->size); + + atag = bi_TagFind(tag_command_line); + if (atag) + memcpy(&command_line, TAGVALPTR(atag), atag->size); + printk("Command line: '%s'\n", command_line); + + memcpy(saved_command_line, command_line, CL_SIZE); + saved_command_line[CL_SIZE-1] = '\0'; *cmdline_p = command_line; - *memory_start_p = memory_start; + *memory_start_p = (unsigned long) &_end; *memory_end_p = memory_end; -#if 0 - /* - * Check that struct pt_regs is defined properly - * (Should be optimized away, but gcc 2.6.3 is too bad..) - */ - if (FR_SIZE != sizeof(struct pt_regs) || - FR_SIZE & 7) - { - panic("Check_definition_of_struct_pt_regs\n"); +#ifdef CONFIG_BLK_DEV_INITRD + if (LOADER_TYPE) { + initrd_start = INITRD_START ? INITRD_START + PAGE_OFFSET : 0; + initrd_end = initrd_start+INITRD_SIZE; + 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; + } } #endif } |