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
|
#include <camellia/errno.h>
#include <camellia/fsutil.h>
#include <kernel/arch/amd64/ata.h>
#include <kernel/arch/amd64/driver/fsroot.h>
#include <kernel/arch/amd64/driver/util.h>
#include <kernel/mem/virt.h>
#include <kernel/panic.h>
#include <kernel/proc.h>
#include <kernel/util.h>
#include <shared/mem.h>
#include <stdbool.h>
enum {
HANDLE_ROOT,
HANDLE_ATA_ROOT,
HANDLE_ATA,
_SKIP = HANDLE_ATA + 4,
};
static bool exacteq(struct vfs_request *req, const char *str) {
size_t len = strlen(str);
assert(req->input.kern);
return req->input.len == len && !memcmp(req->input.buf_kern, str, len);
}
static int handle(struct vfs_request *req) {
assert(req->caller);
int id = (int)(long __force)req->id;
switch (req->type) {
case VFSOP_OPEN:
if (exacteq(req, "/")) return HANDLE_ROOT;
if (exacteq(req, "/ata/")) return HANDLE_ATA_ROOT;
if (exacteq(req, "/ata/0"))
return ata_available(0) ? HANDLE_ATA+0 : -1;
if (exacteq(req, "/ata/1"))
return ata_available(1) ? HANDLE_ATA+1 : -1;
if (exacteq(req, "/ata/2"))
return ata_available(2) ? HANDLE_ATA+2 : -1;
if (exacteq(req, "/ata/3"))
return ata_available(3) ? HANDLE_ATA+3 : -1;
return -1;
case VFSOP_READ:
switch (id) {
case HANDLE_ROOT: {
// TODO document directory read format
// TODO don't hardcode
const char src[] =
"com1\0"
"ps2\0"
"ata/\0"
"video/";
return req_readcopy(req, src, sizeof src);
}
case HANDLE_ATA_ROOT: {
char list[8] = {};
size_t len = 0;
for (int i = 0; i < 4; i++) {
if (ata_available(i)) {
list[len] = '0' + i;
len += 2;
}
}
return req_readcopy(req, list, len);
}
case HANDLE_ATA: case HANDLE_ATA+1:
case HANDLE_ATA+2: case HANDLE_ATA+3:
if (req->offset < 0) return -1;
char buf[512];
uint32_t sector = req->offset / 512;
size_t len = min(req->output.len, 512 - ((size_t)req->offset & 511));
ata_read(id - HANDLE_ATA, sector, buf);
virt_cpy_to(req->caller->pages, req->output.buf, buf, len);
return len;
default: panic_invalid_state();
}
case VFSOP_CLOSE:
return 0;
default: panic_invalid_state();
}
}
static void accept(struct vfs_request *req) {
if (req->caller) {
vfsreq_finish_short(req, handle(req));
} else {
vfsreq_finish_short(req, -1);
}
}
static bool is_ready(struct vfs_backend __attribute__((unused)) *self) {
return true;
}
static struct vfs_backend backend = BACKEND_KERN(is_ready, accept);
void vfs_root_init(void) { vfs_mount_root_register("", &backend); }
|
