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/*
* 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 <linux/string.h>
#include <asm/processor.h>
#include <asm/page.h>
#include "nonstdio.h"
#include "of1275.h"
/* Passed from the linker */
extern char __image_begin, __image_end;
extern char __ramdisk_begin[], __ramdisk_end;
extern char _start, _end;
extern char image_data[], initrd_data[];
extern int initrd_len, image_len;
extern unsigned int heap_max;
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 setup_bats(unsigned long start);
char *avail_ram;
char *begin_avail, *end_avail;
char *avail_high;
#define SCRATCH_SIZE (128 << 10)
static char heap[SCRATCH_SIZE];
static unsigned long ram_start = 0;
static unsigned long ram_end = 0x1000000;
static unsigned long prog_start = 0x900000;
static unsigned long prog_size = 0x700000;
typedef void (*kernel_start_t)(int, int, void *);
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%p\n", &_start);
setup_bats(ram_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);
prog_size = initrd_start - prog_start;
} else
a2 = 0xdeadbeef;
im = (char *)(&__image_begin);
len = (char *)(&__image_end) - (char *)(&__image_begin);
/* claim 4MB starting at PROG_START */
claim(prog_start, prog_size, 0);
map(prog_start, prog_start, prog_size);
dst = (void *) prog_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%p\n", avail_ram);
printf("gunzipping (0x%p <- 0x%p:0x%p)...", dst, im, im+len);
gunzip(dst, prog_size, im, &len);
printf("done %u bytes\n", len);
printf("%u bytes of heap consumed, max in use %u\n",
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%x\n", sa);
(*(kernel_start_t)sa)(a1, a2, prom);
printf("returned?\n");
pause();
}
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