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
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
#include <generic/vfs.hpp>
#include <generic/devfs.hpp>
#include <klibc/string.hpp>
#include <generic/pmm.hpp>
#include <generic/hhdm.hpp>
#include <utils/errno.hpp>
#include <generic/lock/spinlock.hpp>
#include <cstdint>
#include <atomic>
devfs_node* head_devfs_node = nullptr;
devfs_node root_devfs_node = {};
std::atomic<std::uint64_t> devfs_id = 0;
locks::preempt_spinlock devfs_lock;
devfs_node* devfs_lookup(char* path) {
if(klibc::strcmp(path,"/\0") == 0)
return &root_devfs_node;
bool state = devfs_lock.lock();
devfs_node* current_node = head_devfs_node;
while(current_node != nullptr) {
if(klibc::strcmp(current_node->path, path) == 0) {
devfs_lock.unlock(state);
return current_node;
}
}
devfs_lock.unlock(state);
return nullptr;
}
void create(bool is_tty, char* path, void* arg, std::uint64_t mmap, std::uint64_t mmap_size, std::int32_t (*open)(file_descriptor*fd, devfs_node* node), std::int32_t (*ioctl)(devfs_node* node, std::uint64_t req, void* arg), signed long (*read)(file_descriptor* fd, devfs_node* node, void* buffer, std::size_t count), signed long (*write)(file_descriptor* fd, devfs_node* node, void* buffer, std::size_t count), bool (*poll)(devfs_node* node, vfs_poll_type type), std::int32_t (*close)(file_descriptor* fd, devfs_node* node)) {
bool state = devfs_lock.lock();
assert(devfs_lookup(path) == nullptr," afdsfsdfsf!!!");
devfs_node* new_node = (devfs_node*)(pmm::freelist::alloc_4k() + etc::hhdm());
new_node->mmap = mmap;
new_node->mmap_size = mmap_size;
new_node->open = open;
new_node->write = write;
new_node->read = read;
new_node->poll = poll;
new_node->close = close;
new_node->ioctl = ioctl;
new_node->arg = arg;
new_node->is_a_tty = is_tty;
new_node->id = ++devfs_id;
new_node->next = head_devfs_node;
head_devfs_node = new_node;
devfs_lock.unlock(state);
}
std::int32_t devfs_ioctl(file_descriptor* file, std::uint64_t req, void* arg) {
auto node = (devfs_node*)file->fs_specific.tmpfs_pointer;
if(node->ioctl == nullptr)
return -ENOTSUP;
return node->ioctl(node, req, arg);
}
signed long devfs_read(file_descriptor* fd, void* buffer, std::size_t count) {
auto node = (devfs_node*)fd->fs_specific.tmpfs_pointer;
if(node->read == nullptr)
return -ENOTSUP;
return node->read(fd, node, buffer, count);
}
signed long devfs_write(file_descriptor* fd, void* buffer, std::size_t count) {
auto node = (devfs_node*)fd->fs_specific.tmpfs_pointer;
if(node->write == nullptr)
return -ENOTSUP;
return node->write(fd, node, buffer, count);
}
std::int32_t devfs_stat(file_descriptor* file, stat* out) {
if(((devfs_node*)file->other.ls_pointer)->is_root == true) {
out->st_mode = S_IFDIR | 0666;
return 0;
}
(void)file;
(void)out;
out->st_mode = S_IFCHR | 0666;
return 0;
}
bool devfs_poll(file_descriptor* file, vfs_poll_type type) {
auto node = (devfs_node*)file->fs_specific.tmpfs_pointer;
if(node->poll == nullptr)
return false;
return node->poll(node, type);
}
std::int32_t devfs_mmap(file_descriptor* file, std::uint64_t* out_phys, std::size_t* out_size) {
auto node = (devfs_node*)file->fs_specific.tmpfs_pointer;
if(node->mmap == 0)
return -EINVAL;
*out_phys = node->mmap;
*out_size = node->mmap_size;
return 0;
}
void devfs_close(file_descriptor* file) {
auto node = (devfs_node*)file->fs_specific.tmpfs_pointer;
if(node->close == nullptr)
return;
node->close(file, node);
return;
}
signed long devfs_ls(file_descriptor* file, char* out, std::size_t count) {
bool state = devfs_lock.lock();
dirent* dir = (dirent*)out;
if(file->other.ls_pointer == nullptr) {
devfs_lock.unlock(state);
return 0;
} else if(file->other.ls_pointer == (void*)1) {
file->other.ls_pointer = (void*)head_devfs_node;
}
devfs_node* node = (devfs_node*)file->other.ls_pointer;
if(count < sizeof(dirent) + 1 + klibc::strlen(node->path)) {
devfs_lock.unlock(state);
return 0;
}
dir->d_ino = node->id;
dir->d_reclen = sizeof(dirent) + 1 + klibc::strlen(node->path + 1);
dir->d_type = DT_CHR;
dir->d_off = 0;
klibc::memcpy(dir->d_name, node->path + 1, klibc::strlen(node->path + 1) + 1);
file->other.ls_pointer = (void*)(node->next);
devfs_lock.unlock(state);
return dir->d_reclen;
}
std::int32_t devfs_open(filesystem* fs, void* file_desc, char* path, bool is_directory) {
(void)fs;
auto node = devfs_lookup(path);
if(node == nullptr)
return -EINVAL;
file_descriptor* fd = (file_descriptor*)file_desc;
if(node->is_root && is_directory) {
fd->vnode.stat = devfs_stat;
fd->vnode.ls = devfs_ls;
fd->other.ls_pointer = (void*)1;
fd->fs_specific.tmpfs_pointer = (std::uint64_t)(&root_devfs_node);
return 0;
}
fd->vnode.stat = devfs_stat;
fd->vnode.ioctl = devfs_ioctl;
fd->vnode.poll = devfs_poll;
fd->vnode.mmap = devfs_mmap;
fd->vnode.read = devfs_read;
fd->vnode.write = devfs_write;
fd->vnode.close = devfs_close;
fd->other.is_a_tty = node->is_a_tty;
fd->fs_specific.tmpfs_pointer = (std::uint64_t)node;
if(node->open)
node->open(fd, node);
return 0;
}
std::int32_t devfs_readlink(filesystem* fs, char* path, char* buffer) {
(void)fs;
(void)path;
(void)buffer;
return -EINVAL;
}
std::int32_t devfs_create(filesystem* fs, char* path, vfs_file_type type, std::uint32_t mode) {
(void)fs;
(void)path;
(void)type;
(void)mode;
return -ENOTSUP;
}
std::int32_t devfs_remove(filesystem* fs, char* path) {
(void)fs;
(void)path;
return -ENOTSUP;
}
void init(vfs::node* new_node) {
root_devfs_node.is_root = true;
new_node->fs->create = devfs_create;
new_node->fs->open = devfs_open;
new_node->fs->readlink = devfs_readlink;
new_node->fs->remove = devfs_remove;
klibc::memcpy(new_node->path, "/dev\0", sizeof("/dev\0") + 1);
}
|
