1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/*
|
|
* 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 "nonstdio.h"
|
|
#include "of1275.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 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);
|
|
|
|
char *avail_ram;
|
|
char *begin_avail, *end_avail;
|
|
char *avail_high;
|
|
|
|
|
|
#define RAM_END (16 << 20)
|
|
|
|
#define PROG_START 0x00010000
|
|
#define PROG_SIZE 0x007f0000
|
|
|
|
#define SCRATCH_SIZE (128 << 10)
|
|
|
|
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("chrpboot starting: loaded at 0x%p\n", &_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
|
|
a2 = 0xdeadbeef;
|
|
|
|
im = (char *)(&__image_begin);
|
|
len = (char *)(&__image_end) - (char *)(&__image_begin);
|
|
/* claim 3MB starting at PROG_START */
|
|
claim(PROG_START, PROG_SIZE, 0);
|
|
dst = (void *) PROG_START;
|
|
if (im[0] == 0x1f && im[1] == 0x8b) {
|
|
/* claim some memory for scratch space */
|
|
avail_ram = (char *) claim(0, SCRATCH_SIZE, 0x10);
|
|
begin_avail = avail_high = avail_ram;
|
|
end_avail = avail_ram + SCRATCH_SIZE;
|
|
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);
|
|
release(begin_avail, SCRATCH_SIZE);
|
|
} else {
|
|
memmove(dst, im, len);
|
|
}
|
|
|
|
flush_cache(dst, len);
|
|
make_bi_recs(((unsigned long) dst + len), "chrpboot", _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();
|
|
}
|