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#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;
}
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