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
|
/*
* This is a set of functions that provides access to a Linux kernel
* starting at sector BOOT_SECT+aboot_size/SECT_SIZE
*
* Michael Schwingen (rincewind@discworld.oche.de).
*/
#include "system.h"
#include <config.h>
#include <aboot.h>
#include <bootfs.h>
#include <cons.h>
#include <utils.h>
#define BLOCKSIZE (16*SECT_SIZE)
static int dummy_mount(long cons_dev, long p_offset, long quiet);
static int dummy_bread(int fd, long blkno, long nblks, char *buffer);
static int dummy_open(const char *filename);
static void dummy_close(int fd);
struct bootfs dummyfs = {
0, BLOCKSIZE,
dummy_mount,
dummy_open, dummy_bread, dummy_close
};
static long dev = -1;
/*
* Initialize 'filesystem'
* Returns 0 if successful, -1 on failure.
*/
static int
dummy_mount(long cons_dev, long p_offset, long quiet)
{
dev = cons_dev;
return 0;
}
/*
* Read block number "blkno".
*/
static int
dummy_bread(int fd, long blkno, long nblks, char *buffer)
{
extern char _end;
static long aboot_size = 0;
if (!aboot_size) {
aboot_size = &_end - (char *) BOOT_ADDR + SECT_SIZE - 1;
aboot_size &= ~(SECT_SIZE - 1);
}
if (cons_read(dev, buffer, nblks*BLOCKSIZE,
BOOT_SECTOR*SECT_SIZE + blkno*BLOCKSIZE + aboot_size)
!= nblks*BLOCKSIZE)
{
printf("dummy_bread: read error\n");
return -1;
}
return nblks*BLOCKSIZE;
}
/*
* Unix-like open routine. Returns a small integer
* (does not care what file, we say it's OK)
*/
static int dummy_open(const char *filename)
{
return 1;
}
static void dummy_close(int fd)
{
}
|
