diff options
Diffstat (limited to 'arch/ppc/boot/openfirmware/chrpmain.c')
-rw-r--r-- | arch/ppc/boot/openfirmware/chrpmain.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/arch/ppc/boot/openfirmware/chrpmain.c b/arch/ppc/boot/openfirmware/chrpmain.c new file mode 100644 index 00000000000..6fb4f738728 --- /dev/null +++ b/arch/ppc/boot/openfirmware/chrpmain.c @@ -0,0 +1,101 @@ +/* + * 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 *, unsigned long); +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_START 0x00000000 +#define RAM_END (64<<20) + +#define BOOT_START ((unsigned long)_start) +#define BOOT_END ((unsigned long)(_end + 0xFFF) & ~0xFFF) + +#define RAM_FREE ((unsigned long)(_end+0x1000)&~0xFFF) +#define PROG_START 0x00010000 +#define PROG_SIZE 0x007f0000 /* 8MB */ + +#define SCRATCH_SIZE (128 << 10) + +static char scratch[SCRATCH_SIZE]; /* 1MB of scratch space for gunzip */ + +typedef void (*kernel_start_t)(int, int, void *, unsigned int, unsigned int); + +void +boot(int a1, int a2, void *prom) +{ + unsigned sa, len; + void *dst; + unsigned char *im; + unsigned int initrd_size, initrd_start; + + printf("chrpboot starting: loaded at 0x%p\n\r", &_start); + + initrd_size = &__ramdisk_end - &__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, &__ramdisk_begin, initrd_size); + memcpy((char *)initrd_start, &__ramdisk_begin, initrd_size); + } else { + initrd_start = 0; + initrd_size = 0; + a2 = 0xdeadbeef; + } + + im = &__image_begin; + len = &__image_end - &__image_begin; + /* claim 4MB starting at PROG_START */ + claim(PROG_START, PROG_SIZE - PROG_START, 0); + dst = (void *) PROG_START; + if (im[0] == 0x1f && im[1] == 0x8b) { + avail_ram = scratch; + begin_avail = avail_high = avail_ram; + end_avail = scratch + sizeof(scratch); + printf("gunzipping (0x%p <- 0x%p:0x%p)...", dst, im, im+len); + gunzip(dst, 0x400000, im, &len); + printf("done %u bytes\n\r", len); + printf("%u bytes of heap consumed, max in use %u\n\r", + avail_high - begin_avail, heap_max); + } else { + memmove(dst, im, len); + } + + flush_cache(dst, len); + make_bi_recs(((unsigned long) dst + len), "chrpboot", _MACH_chrp, + (PROG_START + PROG_SIZE)); + + sa = PROG_START; + printf("start address = 0x%x\n\r", sa); + + (*(kernel_start_t)sa)(a1, a2, prom, initrd_start, initrd_size); + + printf("returned?\n\r"); + + pause(); +} |