about summary refs log tree commit diff stats
path: root/kernel.soso/devfs.c
blob: bfff39cb68e31a7efd64a460ada7c2d26fe100ef (plain) (blame)
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
#include "devfs.h"
#include "common.h"
#include "fs.h"
#include "alloc.h"
#include "device.h"
#include "screen.h"
#include "list.h"
#include "spinlock.h"

static FileSystemNode* gDevRoot = NULL;

static List* gDeviceList = NULL;
static Spinlock gDeviceListLock;

static BOOL devfs_open(File *node, uint32 flags);
static FileSystemDirent *devfs_readdir(FileSystemNode *node, uint32 index);
static FileSystemNode *devfs_finddir(FileSystemNode *node, char *name);

static FileSystemDirent gDirent;

void initializeDevFS() {
    gDevRoot = kmalloc(sizeof(FileSystemNode));
    memset((uint8*)gDevRoot, 0, sizeof(FileSystemNode));

    gDevRoot->nodeType = FT_Directory;

    FileSystemNode* rootFs = getFileSystemRootNode();

    FileSystemNode* devNode = finddir_fs(rootFs, "dev");

    if (devNode) {
        devNode->nodeType |= FT_MountPoint;
        devNode->mountPoint = gDevRoot;
        gDevRoot->parent = devNode->parent;
        strcpy(gDevRoot->name, devNode->name);
    }
    else {
        PANIC("/dev does not exist!");
    }

    gDevRoot->open = devfs_open;
    gDevRoot->finddir = devfs_finddir;
    gDevRoot->readdir = devfs_readdir;

    gDeviceList = List_Create();
    Spinlock_Init(&gDeviceListLock);
}

static BOOL devfs_open(File *node, uint32 flags) {
    return TRUE;
}

static FileSystemDirent *devfs_readdir(FileSystemNode *node, uint32 index) {
    FileSystemDirent * result = NULL;

    uint32 counter = 0;

    Spinlock_Lock(&gDeviceListLock);

    List_Foreach(n, gDeviceList) {
        if (index == counter) {
            FileSystemNode* deviceNode = (FileSystemNode*)n->data;
            strcpy(gDirent.name, deviceNode->name);
            gDirent.fileType = deviceNode->nodeType;
            gDirent.inode = index;
            result = &gDirent;
            break;
        }

        ++counter;
    }
    Spinlock_Unlock(&gDeviceListLock);

    return result;
}

static FileSystemNode *devfs_finddir(FileSystemNode *node, char *name) {
    FileSystemNode* result = NULL;


    Spinlock_Lock(&gDeviceListLock);

    List_Foreach(n, gDeviceList) {
        FileSystemNode* deviceNode = (FileSystemNode*)n->data;

        if (strcmp(name, deviceNode->name) == 0) {
            result = deviceNode;
            break;
        }
    }

    Spinlock_Unlock(&gDeviceListLock);

    return result;
}

FileSystemNode* registerDevice(Device* device) {
    Spinlock_Lock(&gDeviceListLock);

    List_Foreach(n, gDeviceList) {
        FileSystemNode* deviceNode = (FileSystemNode*)n->data;

        if (strcmp(device->name, deviceNode->name) == 0) {
            //There is already a device with the same name
            Spinlock_Unlock(&gDeviceListLock);
            return NULL;
        }
    }

    FileSystemNode* deviceNode = (FileSystemNode*)kmalloc(sizeof(FileSystemNode));
    memset((uint8*)deviceNode, 0, sizeof(FileSystemNode));
    strcpy(deviceNode->name, device->name);
    deviceNode->nodeType = device->deviceType;
    deviceNode->open = device->open;
    deviceNode->close = device->close;
    deviceNode->readBlock = device->readBlock;
    deviceNode->writeBlock = device->writeBlock;
    deviceNode->read = device->read;
    deviceNode->write = device->write;
    deviceNode->ioctl = device->ioctl;
    deviceNode->ftruncate = device->ftruncate;
    deviceNode->mmap = device->mmap;
    deviceNode->munmap = device->munmap;
    deviceNode->privateNodeData = device->privateData;
    deviceNode->parent = gDevRoot;

    List_Append(gDeviceList, deviceNode);

    Spinlock_Unlock(&gDeviceListLock);

    return deviceNode;
}