| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) Paul Mackerras 1997. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | */ |
| 9 | #include <linux/string.h> |
| 10 | #include "nonstdio.h" |
| 11 | #include "of1275.h" |
| 12 | #include <asm/processor.h> |
| 13 | #include <asm/page.h> |
| 14 | |
| 15 | /* Passed from the linker */ |
| 16 | extern char __image_begin, __image_end; |
| 17 | extern char __ramdisk_begin, __ramdisk_end; |
| 18 | extern char _start, _end; |
| 19 | |
| 20 | extern unsigned int heap_max; |
| 21 | extern void flush_cache(void *, unsigned long); |
| 22 | extern void gunzip(void *, int, unsigned char *, int *); |
| 23 | extern void make_bi_recs(unsigned long addr, char *name, unsigned int mach, |
| 24 | unsigned int progend); |
| 25 | |
| 26 | char *avail_ram; |
| 27 | char *begin_avail, *end_avail; |
| 28 | char *avail_high; |
| 29 | |
| 30 | #define RAM_START 0x00000000 |
| 31 | #define RAM_END (64<<20) |
| 32 | |
| 33 | #define BOOT_START ((unsigned long)_start) |
| 34 | #define BOOT_END ((unsigned long)(_end + 0xFFF) & ~0xFFF) |
| 35 | |
| 36 | #define RAM_FREE ((unsigned long)(_end+0x1000)&~0xFFF) |
| 37 | #define PROG_START 0x00010000 |
| 38 | #define PROG_SIZE 0x007f0000 /* 8MB */ |
| 39 | |
| 40 | #define SCRATCH_SIZE (128 << 10) |
| 41 | |
| 42 | static char scratch[SCRATCH_SIZE]; /* 1MB of scratch space for gunzip */ |
| 43 | |
| 44 | typedef void (*kernel_start_t)(int, int, void *, unsigned int, unsigned int); |
| 45 | |
| 46 | void |
| 47 | boot(int a1, int a2, void *prom) |
| 48 | { |
| 49 | unsigned sa, len; |
| 50 | void *dst; |
| 51 | unsigned char *im; |
| 52 | unsigned int initrd_size, initrd_start; |
| 53 | |
| 54 | printf("chrpboot starting: loaded at 0x%p\n\r", &_start); |
| 55 | |
| 56 | initrd_size = &__ramdisk_end - &__ramdisk_begin; |
| 57 | if (initrd_size) { |
| 58 | initrd_start = (RAM_END - initrd_size) & ~0xFFF; |
| 59 | a1 = initrd_start; |
| 60 | a2 = initrd_size; |
| 61 | claim(initrd_start, RAM_END - initrd_start, 0); |
| 62 | printf("initial ramdisk moving 0x%x <- 0x%p (%x bytes)\n\r", |
| 63 | initrd_start, &__ramdisk_begin, initrd_size); |
| 64 | memcpy((char *)initrd_start, &__ramdisk_begin, initrd_size); |
| 65 | } else { |
| 66 | initrd_start = 0; |
| 67 | initrd_size = 0; |
| 68 | a2 = 0xdeadbeef; |
| 69 | } |
| 70 | |
| 71 | im = &__image_begin; |
| 72 | len = &__image_end - &__image_begin; |
| 73 | /* claim 4MB starting at PROG_START */ |
| 74 | claim(PROG_START, PROG_SIZE - PROG_START, 0); |
| 75 | dst = (void *) PROG_START; |
| 76 | if (im[0] == 0x1f && im[1] == 0x8b) { |
| 77 | avail_ram = scratch; |
| 78 | begin_avail = avail_high = avail_ram; |
| 79 | end_avail = scratch + sizeof(scratch); |
| 80 | printf("gunzipping (0x%p <- 0x%p:0x%p)...", dst, im, im+len); |
| 81 | gunzip(dst, 0x400000, im, &len); |
| 82 | printf("done %u bytes\n\r", len); |
| 83 | printf("%u bytes of heap consumed, max in use %u\n\r", |
| 84 | avail_high - begin_avail, heap_max); |
| 85 | } else { |
| 86 | memmove(dst, im, len); |
| 87 | } |
| 88 | |
| 89 | flush_cache(dst, len); |
| 90 | make_bi_recs(((unsigned long) dst + len), "chrpboot", _MACH_chrp, |
| 91 | (PROG_START + PROG_SIZE)); |
| 92 | |
| 93 | sa = PROG_START; |
| 94 | printf("start address = 0x%x\n\r", sa); |
| 95 | |
| 96 | (*(kernel_start_t)sa)(a1, a2, prom, initrd_start, initrd_size); |
| 97 | |
| 98 | printf("returned?\n\r"); |
| 99 | |
| 100 | pause(); |
| 101 | } |