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>
12 #include <asm/processor.h>
15 /* Passed from the linker */
16 extern char __image_begin, __image_end;
17 extern char __ramdisk_begin[], __ramdisk_end;
18 extern char _start, _end;
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);
27 char *begin_avail, *end_avail;
31 #define RAM_END (16 << 20)
33 #define PROG_START 0x00010000
34 #define PROG_SIZE 0x007f0000
36 #define SCRATCH_SIZE (128 << 10)
38 typedef void (*kernel_start_t)(int, int, void *);
40 void boot(int a1, int a2, void *prom)
45 unsigned initrd_start, initrd_size;
47 printf("chrpboot starting: loaded at 0x%p\n", &_start);
49 initrd_size = (char *)(&__ramdisk_end) - (char *)(&__ramdisk_begin);
51 initrd_start = (RAM_END - initrd_size) & ~0xFFF;
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);
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);
79 memmove(dst, im, len);
82 flush_cache(dst, len);
83 make_bi_recs(((unsigned long) dst + len), "chrpboot", _MACH_Pmac,
84 (PROG_START + PROG_SIZE));
86 sa = (unsigned long)PROG_START;
87 printf("start address = 0x%x\n", sa);
89 (*(kernel_start_t)sa)(a1, a2, prom);
91 printf("returned?\n");