Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/mips/dec/decstation.c |
| 3 | */ |
| 4 | |
| 5 | #define RELOC |
| 6 | #define INITRD |
| 7 | #define DEBUG_BOOT |
| 8 | |
| 9 | /* |
| 10 | * Magic number indicating REX PROM available on DECSTATION. |
| 11 | */ |
| 12 | #define REX_PROM_MAGIC 0x30464354 |
| 13 | |
| 14 | #define REX_PROM_CLEARCACHE 0x7c/4 |
| 15 | #define REX_PROM_PRINTF 0x30/4 |
| 16 | |
| 17 | #define VEC_RESET 0xBFC00000 /* Prom base address */ |
| 18 | #define PMAX_PROM_ENTRY(x) (VEC_RESET+((x)*8)) /* Prom jump table */ |
| 19 | #define PMAX_PROM_PRINTF PMAX_PROM_ENTRY(17) |
| 20 | |
| 21 | #define PARAM (k_start + 0x2000) |
| 22 | |
| 23 | #define LOADER_TYPE (*(unsigned char *) (PARAM+0x210)) |
| 24 | #define INITRD_START (*(unsigned long *) (PARAM+0x218)) |
| 25 | #define INITRD_SIZE (*(unsigned long *) (PARAM+0x21c)) |
| 26 | |
| 27 | extern int _ftext, _end; /* begin and end of kernel image */ |
| 28 | extern void kernel_entry(int, char **, unsigned long, int *); |
| 29 | |
| 30 | void * memcpy(void * dest, const void *src, unsigned int count) |
| 31 | { |
| 32 | unsigned long *tmp = (unsigned long *) dest, *s = (unsigned long *) src; |
| 33 | |
| 34 | count >>= 2; |
| 35 | while (count--) |
| 36 | *tmp++ = *s++; |
| 37 | |
| 38 | return dest; |
| 39 | } |
| 40 | |
| 41 | void dec_entry(int argc, char **argv, |
| 42 | unsigned long magic, int *prom_vec) |
| 43 | { |
| 44 | void (*rex_clear_cache)(void); |
| 45 | int (*prom_printf)(char *, ...); |
| 46 | unsigned long k_start, len; |
| 47 | |
| 48 | /* |
| 49 | * The DS5100 leaves cpu with BEV enabled, clear it. |
| 50 | */ |
| 51 | asm( "lui\t$8,0x3000\n\t" |
| 52 | "mtc0\t$8,$12\n\t" |
| 53 | ".section\t.sdata\n\t" |
| 54 | ".section\t.sbss\n\t" |
| 55 | ".section\t.text" |
| 56 | : : : "$8"); |
| 57 | |
| 58 | #ifdef DEBUG_BOOT |
| 59 | if (magic == REX_PROM_MAGIC) { |
| 60 | prom_printf = (int (*)(char *, ...)) *(prom_vec + REX_PROM_PRINTF); |
| 61 | } else { |
| 62 | prom_printf = (int (*)(char *, ...)) PMAX_PROM_PRINTF; |
| 63 | } |
| 64 | prom_printf("Launching kernel...\n"); |
| 65 | #endif |
| 66 | |
| 67 | k_start = (unsigned long) (&kernel_entry) & 0xffff0000; |
| 68 | |
| 69 | #ifdef RELOC |
| 70 | /* |
| 71 | * Now copy kernel image to its destination. |
| 72 | */ |
| 73 | len = ((unsigned long) (&_end) - k_start); |
| 74 | memcpy((void *)k_start, &_ftext, len); |
| 75 | #endif |
| 76 | |
| 77 | if (magic == REX_PROM_MAGIC) { |
| 78 | rex_clear_cache = (void (*)(void)) * (prom_vec + REX_PROM_CLEARCACHE); |
| 79 | rex_clear_cache(); |
| 80 | } |
| 81 | |
| 82 | kernel_entry(argc, argv, magic, prom_vec); |
| 83 | } |