102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
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/*
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* Copyright (C) Paul Mackerras 1997.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/string.h>
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#include "nonstdio.h"
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#include "of1275.h"
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#include <asm/processor.h>
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#include <asm/page.h>
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/* Passed from the linker */
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extern char __image_begin, __image_end;
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extern char __ramdisk_begin, __ramdisk_end;
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extern char _start, _end;
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extern unsigned int heap_max;
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extern void flush_cache(void *, unsigned long);
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extern void gunzip(void *, int, unsigned char *, int *);
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extern void make_bi_recs(unsigned long addr, char *name, unsigned int mach,
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unsigned int progend);
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char *avail_ram;
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char *begin_avail, *end_avail;
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char *avail_high;
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#define RAM_START 0x00000000
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#define RAM_END (64<<20)
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#define BOOT_START ((unsigned long)_start)
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#define BOOT_END ((unsigned long)(_end + 0xFFF) & ~0xFFF)
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#define RAM_FREE ((unsigned long)(_end+0x1000)&~0xFFF)
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#define PROG_START 0x00010000
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#define PROG_SIZE 0x007f0000 /* 8MB */
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#define SCRATCH_SIZE (128 << 10)
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static char scratch[SCRATCH_SIZE]; /* 1MB of scratch space for gunzip */
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typedef void (*kernel_start_t)(int, int, void *, unsigned int, unsigned int);
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void
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boot(int a1, int a2, void *prom)
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{
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unsigned sa, len;
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void *dst;
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unsigned char *im;
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unsigned int initrd_size, initrd_start;
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printf("chrpboot starting: loaded at 0x%p\n\r", &_start);
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initrd_size = &__ramdisk_end - &__ramdisk_begin;
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if (initrd_size) {
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initrd_start = (RAM_END - initrd_size) & ~0xFFF;
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a1 = initrd_start;
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a2 = initrd_size;
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claim(initrd_start, RAM_END - initrd_start, 0);
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printf("initial ramdisk moving 0x%x <- 0x%p (%x bytes)\n\r",
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initrd_start, &__ramdisk_begin, initrd_size);
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memcpy((char *)initrd_start, &__ramdisk_begin, initrd_size);
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} else {
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initrd_start = 0;
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initrd_size = 0;
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a2 = 0xdeadbeef;
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}
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im = &__image_begin;
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len = &__image_end - &__image_begin;
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/* claim 4MB starting at PROG_START */
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claim(PROG_START, PROG_SIZE - PROG_START, 0);
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dst = (void *) PROG_START;
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if (im[0] == 0x1f && im[1] == 0x8b) {
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avail_ram = scratch;
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begin_avail = avail_high = avail_ram;
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end_avail = scratch + sizeof(scratch);
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printf("gunzipping (0x%p <- 0x%p:0x%p)...", dst, im, im+len);
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gunzip(dst, 0x400000, im, &len);
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printf("done %u bytes\n\r", len);
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printf("%u bytes of heap consumed, max in use %u\n\r",
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avail_high - begin_avail, heap_max);
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} else {
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memmove(dst, im, len);
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}
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flush_cache(dst, len);
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make_bi_recs(((unsigned long) dst + len), "chrpboot", _MACH_chrp,
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(PROG_START + PROG_SIZE));
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sa = PROG_START;
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printf("start address = 0x%x\n\r", sa);
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(*(kernel_start_t)sa)(a1, a2, prom, initrd_start, initrd_size);
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printf("returned?\n\r");
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pause();
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}
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