2 * Copyright (C) Paul Mackerras 1997.
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.
9 #include <linux/string.h>
10 #include <asm/processor.h>
17 /* Passed from the linker */
18 extern char __image_begin, __image_end;
19 extern char __ramdisk_begin[], __ramdisk_end;
20 extern char _start, _end;
22 extern char image_data[], initrd_data[];
23 extern int initrd_len, image_len;
24 extern unsigned int heap_max;
25 extern void flush_cache(void *start, unsigned int len);
26 extern void gunzip(void *, int, unsigned char *, int *);
27 extern void make_bi_recs(unsigned long addr, char *name, unsigned int mach,
28 unsigned int progend);
29 extern void setup_bats(unsigned long start);
32 char *begin_avail, *end_avail;
35 #define SCRATCH_SIZE (128 << 10)
37 static char heap[SCRATCH_SIZE];
39 static unsigned long ram_start = 0;
40 static unsigned long ram_end = 0x1000000;
42 static unsigned long prog_start = 0x900000;
43 static unsigned long prog_size = 0x700000;
45 typedef void (*kernel_start_t)(int, int, void *);
47 void boot(int a1, int a2, void *prom)
52 unsigned initrd_start, initrd_size;
54 printf("coffboot starting: loaded at 0x%p\n", &_start);
55 setup_bats(ram_start);
57 initrd_size = (char *)(&__ramdisk_end) - (char *)(&__ramdisk_begin);
59 initrd_start = (ram_end - initrd_size) & ~0xFFF;
62 claim(initrd_start, ram_end - initrd_start, 0);
63 printf("initial ramdisk moving 0x%x <- 0x%p (%x bytes)\n\r",
64 initrd_start, (char *)(&__ramdisk_begin), initrd_size);
65 memcpy((char *)initrd_start, (char *)(&__ramdisk_begin), initrd_size);
66 prog_size = initrd_start - prog_start;
70 im = (char *)(&__image_begin);
71 len = (char *)(&__image_end) - (char *)(&__image_begin);
72 /* claim 4MB starting at PROG_START */
73 claim(prog_start, prog_size, 0);
74 map(prog_start, prog_start, prog_size);
75 dst = (void *) prog_start;
76 if (im[0] == 0x1f && im[1] == 0x8b) {
77 /* set up scratch space */
78 begin_avail = avail_high = avail_ram = heap;
79 end_avail = heap + sizeof(heap);
80 printf("heap at 0x%p\n", avail_ram);
81 printf("gunzipping (0x%p <- 0x%p:0x%p)...", dst, im, im+len);
82 gunzip(dst, prog_size, im, &len);
83 printf("done %u bytes\n", len);
84 printf("%u bytes of heap consumed, max in use %u\n",
85 avail_high - begin_avail, heap_max);
87 memmove(dst, im, len);
90 flush_cache(dst, len);
91 make_bi_recs(((unsigned long) dst + len), "coffboot", _MACH_Pmac,
92 (prog_start + prog_size));
94 sa = (unsigned long)prog_start;
95 printf("start address = 0x%x\n", sa);
97 (*(kernel_start_t)sa)(a1, a2, prom);
99 printf("returned?\n");