| 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 *start, unsigned int len); |
| 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 | |
| 31 | #define RAM_END (16 << 20) |
| 32 | |
| 33 | #define PROG_START 0x00010000 |
| 34 | #define PROG_SIZE 0x007f0000 |
| 35 | |
| 36 | #define SCRATCH_SIZE (128 << 10) |
| 37 | |
| 38 | typedef void (*kernel_start_t)(int, int, void *); |
| 39 | |
| 40 | void boot(int a1, int a2, void *prom) |
| 41 | { |
| 42 | unsigned sa, len; |
| 43 | void *dst; |
| 44 | unsigned char *im; |
| 45 | unsigned initrd_start, initrd_size; |
| 46 | |
| 47 | printf("chrpboot starting: loaded at 0x%p\n", &_start); |
| 48 | |
| 49 | initrd_size = (char *)(&__ramdisk_end) - (char *)(&__ramdisk_begin); |
| 50 | if (initrd_size) { |
| 51 | initrd_start = (RAM_END - initrd_size) & ~0xFFF; |
| 52 | a1 = initrd_start; |
| 53 | a2 = initrd_size; |
| 54 | claim(initrd_start, RAM_END - initrd_start, 0); |
| 55 | printf("initial ramdisk moving 0x%x <- 0x%p (%x bytes)\n\r", |
| 56 | initrd_start, (char *)(&__ramdisk_begin), initrd_size); |
| 57 | memcpy((char *)initrd_start, (char *)(&__ramdisk_begin), initrd_size); |
| 58 | } else |
| 59 | a2 = 0xdeadbeef; |
| 60 | |
| 61 | im = (char *)(&__image_begin); |
| 62 | len = (char *)(&__image_end) - (char *)(&__image_begin); |
| 63 | /* claim 3MB starting at PROG_START */ |
| 64 | claim(PROG_START, PROG_SIZE, 0); |
| 65 | dst = (void *) PROG_START; |
| 66 | if (im[0] == 0x1f && im[1] == 0x8b) { |
| 67 | /* claim some memory for scratch space */ |
| 68 | avail_ram = (char *) claim(0, SCRATCH_SIZE, 0x10); |
| 69 | begin_avail = avail_high = avail_ram; |
| 70 | end_avail = avail_ram + SCRATCH_SIZE; |
| 71 | printf("heap at 0x%p\n", avail_ram); |
| 72 | printf("gunzipping (0x%p <- 0x%p:0x%p)...", dst, im, im+len); |
| 73 | gunzip(dst, PROG_SIZE, im, &len); |
| 74 | printf("done %u bytes\n", len); |
| 75 | printf("%u bytes of heap consumed, max in use %u\n", |
| 76 | avail_high - begin_avail, heap_max); |
| 77 | release(begin_avail, SCRATCH_SIZE); |
| 78 | } else { |
| 79 | memmove(dst, im, len); |
| 80 | } |
| 81 | |
| 82 | flush_cache(dst, len); |
| 83 | make_bi_recs(((unsigned long) dst + len), "chrpboot", _MACH_Pmac, |
| 84 | (PROG_START + PROG_SIZE)); |
| 85 | |
| 86 | sa = (unsigned long)PROG_START; |
| 87 | printf("start address = 0x%x\n", sa); |
| 88 | |
| 89 | (*(kernel_start_t)sa)(a1, a2, prom); |
| 90 | |
| 91 | printf("returned?\n"); |
| 92 | |
| 93 | pause(); |
| 94 | } |