95 lines
2.7 KiB
C
95 lines
2.7 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 *start, unsigned int len);
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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_END (16 << 20)
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#define PROG_START 0x00010000
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#define PROG_SIZE 0x007f0000
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#define SCRATCH_SIZE (128 << 10)
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typedef void (*kernel_start_t)(int, int, void *);
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void 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 initrd_start, initrd_size;
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printf("chrpboot starting: loaded at 0x%p\n", &_start);
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initrd_size = (char *)(&__ramdisk_end) - (char *)(&__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, (char *)(&__ramdisk_begin), initrd_size);
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memcpy((char *)initrd_start, (char *)(&__ramdisk_begin), initrd_size);
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} else
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a2 = 0xdeadbeef;
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im = (char *)(&__image_begin);
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len = (char *)(&__image_end) - (char *)(&__image_begin);
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/* claim 3MB starting at PROG_START */
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claim(PROG_START, PROG_SIZE, 0);
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dst = (void *) PROG_START;
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if (im[0] == 0x1f && im[1] == 0x8b) {
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/* claim some memory for scratch space */
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avail_ram = (char *) claim(0, SCRATCH_SIZE, 0x10);
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begin_avail = avail_high = avail_ram;
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end_avail = avail_ram + SCRATCH_SIZE;
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printf("heap at 0x%p\n", avail_ram);
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printf("gunzipping (0x%p <- 0x%p:0x%p)...", dst, im, im+len);
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gunzip(dst, PROG_SIZE, im, &len);
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printf("done %u bytes\n", len);
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printf("%u bytes of heap consumed, max in use %u\n",
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avail_high - begin_avail, heap_max);
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release(begin_avail, SCRATCH_SIZE);
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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_Pmac,
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(PROG_START + PROG_SIZE));
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sa = (unsigned long)PROG_START;
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printf("start address = 0x%x\n", sa);
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(*(kernel_start_t)sa)(a1, a2, prom);
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printf("returned?\n");
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pause();
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}
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