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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | /* * BK Id: %F% %I% %G% %U% %#% */ /* * Copyright (C) Paul Mackerras 1997. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include "nonstdio.h" #include <asm/processor.h> #include <asm/page.h> /* Passed from the linker */ extern char __image_begin, __image_end; extern char __ramdisk_begin[], __ramdisk_end; extern char _start, _end; extern int getprop(void *, const char *, void *, int); extern unsigned int heap_max; extern void claim(unsigned int virt, unsigned int size, unsigned int align); extern void *finddevice(const char *); extern void flush_cache(void *, unsigned long); extern void gunzip(void *, int, unsigned char *, int *); extern void make_bi_recs(unsigned long addr, char *name, unsigned int mach, unsigned int progend); extern void pause(void); char *avail_ram; char *begin_avail, *end_avail; char *avail_high; #define RAM_START 0x00000000 #define RAM_END (64<<20) #define BOOT_START ((unsigned long)_start) #define BOOT_END ((unsigned long)(_end + 0xFFF) & ~0xFFF) #define RAM_FREE ((unsigned long)(_end+0x1000)&~0xFFF) #define PROG_START 0x00010000 #define PROG_SIZE 0x00400000 /* 4MB */ #define SCRATCH_SIZE (128 << 10) static char scratch[SCRATCH_SIZE]; /* 1MB of scratch space for gunzip */ void chrpboot(int a1, int a2, void *prom) { unsigned sa, len; void *dst; unsigned char *im; unsigned int initrd_size, initrd_start; printf("chrpboot starting: loaded at 0x%p\n\r", &_start); initrd_size = (char *)(&__ramdisk_end) - (char *)(&__ramdisk_begin); if (initrd_size) { initrd_start = (RAM_END - initrd_size) & ~0xFFF; a1 = initrd_start; a2 = initrd_size; claim(initrd_start, RAM_END - initrd_start, 0); printf("initial ramdisk moving 0x%x <- 0x%p (%x bytes)\n\r", initrd_start, (char *)(&__ramdisk_begin), initrd_size); memcpy((char *)initrd_start, (char *)(&__ramdisk_begin), initrd_size); } else { initrd_start = 0; initrd_size = 0; a2 = 0xdeadbeef; } im = (char *)(&__image_begin); len = (char *)(&__image_end) - (char *)(&__image_begin); /* claim 4MB starting at PROG_START */ claim(PROG_START, PROG_SIZE - PROG_START, 0); dst = (void *) PROG_START; if (im[0] == 0x1f && im[1] == 0x8b) { avail_ram = scratch; begin_avail = avail_high = avail_ram; end_avail = scratch + sizeof(scratch); printf("gunzipping (0x%p <- 0x%p:0x%p)...", dst, im, im+len); gunzip(dst, 0x400000, im, &len); printf("done %u bytes\n\r", len); printf("%u bytes of heap consumed, max in use %u\n\r", avail_high - begin_avail, heap_max); } else { memmove(dst, im, len); } flush_cache(dst, len); make_bi_recs(((unsigned long) dst + len), "chrpboot", _MACH_chrp, (PROG_START + PROG_SIZE)); sa = (unsigned long)PROG_START; printf("start address = 0x%x\n\r", sa); (*(void (*)())sa)(a1, a2, prom, initrd_start, initrd_size); printf("returned?\n\r"); pause(); } |