1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
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]; /* 128k 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, PROG_SIZE - PROG_START, 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();
}
|
