coffmain.c
上传用户:lgb322
上传日期:2013-02-24
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文件大小:3k
- /*
- * BK Id: SCCS/s.coffmain.c 1.14 07/27/01 20:24:18 trini
- */
- /*
- * 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 "zlib.h"
- #include <asm/processor.h>
- extern char _start[], _end[];
- extern char *claim(unsigned, unsigned, unsigned);
- extern char image_data[], initrd_data[];
- extern int initrd_len, image_len;
- extern int getprop(void *, const char *, void *, int);
- extern unsigned int heap_max;
- extern void *finddevice(const char *);
- extern void flush_cache(void *start, unsigned int len);
- 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);
- extern void setup_bats(unsigned long start);
- char *avail_ram;
- char *begin_avail, *end_avail;
- char *avail_high;
- #define RAM_START 0
- #define RAM_END (RAM_START + 0x800000) /* only 8M mapped with BATs */
- #define PROG_START RAM_START
- #define PROG_SIZE 0x00400000
- #define SCRATCH_SIZE (128 << 10)
- static char heap[SCRATCH_SIZE];
- void boot(int a1, int a2, void *prom)
- {
- unsigned sa, len;
- void *dst;
- unsigned char *im;
- unsigned initrd_start, initrd_size;
-
- printf("coffboot starting: loaded at 0x%pn", &_start);
- setup_bats(RAM_START);
- if (initrd_len) {
- initrd_size = initrd_len;
- initrd_start = (RAM_END - initrd_size) & ~0xFFF;
- a1 = initrd_start;
- a2 = initrd_size;
- claim(initrd_start - RAM_START, RAM_END - initrd_start, 0);
- printf("initial ramdisk moving 0x%x <- 0x%p (%x bytes)n",
- initrd_start, initrd_data, initrd_size);
- memcpy((char *)initrd_start, initrd_data, initrd_size);
- }
- im = image_data;
- len = image_len;
- /* claim 4MB starting at 0 */
- claim(0, PROG_SIZE, 0);
- dst = (void *) RAM_START;
- if (im[0] == 0x1f && im[1] == 0x8b) {
- /* set up scratch space */
- begin_avail = avail_high = avail_ram = heap;
- end_avail = heap + sizeof(heap);
- printf("heap at 0x%pn", avail_ram);
- printf("gunzipping (0x%p <- 0x%p:0x%p)...", dst, im, im+len);
- gunzip(dst, PROG_SIZE, im, &len);
- printf("done %u bytesn", len);
- printf("%u bytes of heap consumed, max in use %un",
- avail_high - begin_avail, heap_max);
- } else {
- memmove(dst, im, len);
- }
- flush_cache(dst, len);
- make_bi_recs(((unsigned long) dst + len), "coffboot", _MACH_Pmac,
- (PROG_START + PROG_SIZE));
- sa = (unsigned long)PROG_START;
- printf("start address = 0x%xn", sa);
- (*(void (*)())sa)(a1, a2, prom);
- printf("returned?n");
- pause();
- }