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/*
* BK Id: SCCS/s.chrpmain.c 1.16 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 _end[];
extern char image_data[], initrd_data[];
extern int image_len, initrd_len;
extern int getprop(void *, const char *, void *, int);
extern unsigned int heap_max;
extern void *claim(unsigned int, unsigned int, unsigned int);
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 release(void *ptr, unsigned int len);
char *avail_ram;
char *begin_avail, *end_avail;
char *avail_high;
#define RAM_END (16 << 20)
#define PROG_START 0x00010000
#define PROG_SIZE 0x003f0000
#define SCRATCH_SIZE (128 << 10)
void boot(int a1, int a2, void *prom)
{
unsigned sa, len;
void *dst;
unsigned char *im;
unsigned initrd_start, initrd_size;
extern char _start;
printf("chrpboot starting: loaded at 0x%p\n", &_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_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 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);
(*(void (*)())sa)(a1, a2, prom);
printf("returned?\n");
pause();
}
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