wd_misc.c
上传用户:yj_qqy
上传日期:2017-01-28
资源大小:2911k
文件大小:11k
- /*
- **********************************************************************
- * Micrium, Inc.
- * 949 Crestview Circle
- * Weston, FL 33327-1848
- *
- * uC/FS
- *
- * (c) Copyright 2001 - 2003, Micrium, Inc.
- * All rights reserved.
- *
- ***********************************************************************
- ----------------------------------------------------------------------
- File : wd_misc.c
- Purpose : Device Driver using Windows I/O function for logical sector
- access.
- ----------------------------------------------------------------------
- Known problems or limitations with current version
- ----------------------------------------------------------------------
- None.
- ---------------------------END-OF-HEADER------------------------------
- */
- /*********************************************************************
- *
- * #include Section
- *
- **********************************************************************
- */
- #include "fs_port.h"
- #include "fs_dev.h"
- #include "fs_lbl.h"
- #include "fs_conf.h"
- #include "fs_api.h"
- #include "fs_clib.h"
- #if FS_USE_WINDRIVE_DRIVER
- #ifndef _WIN32
- #error Driver requires Windows API
- #endif /* _WIN32 */
- #include <windows.h>
- /*********************************************************************
- *
- * Local data types
- *
- **********************************************************************
- */
- typedef struct {
- FS_u32 block;
- char buffer[FS_WD_BLOCKSIZE];
- } _FS_wd_cachetype;
- /*********************************************************************
- *
- * Local variables
- *
- **********************************************************************
- */
- static unsigned char _workbuffer[512];
- static HANDLE _hdrive[FS_WD_MAXUNIT];
- static _FS_wd_cachetype _FS_wd_cache[FS_WD_MAXUNIT][FS_WD_CACHENUM];
- static int _FS_wd_cache_index[FS_WD_MAXUNIT];
- static _FS_wd_cachetype _FS_wd_wbuffer[FS_WD_MAXUNIT][FS_WD_WBUFFNUM];
- static int _online[FS_WD_MAXUNIT];
- /*********************************************************************
- *
- * Local functions
- *
- **********************************************************************
- */
- /*********************************************************************
- *
- * _FS_WD_DevStatus
- *
- Description:
- FS driver function. Get status of the media.
- Parameters:
- Unit - Unit number.
-
- Return value:
- ==1 (FS_LBL_MEDIACHANGED) - The media of the device has changed.
- ==0 - Device okay and ready for operation.
- <0 - An error has occured.
- */
- static int _FS_WD_DevStatus(FS_u32 Unit) {
- int i;
- if (!_online[Unit]) {
- _online[Unit] = 1;
- if (Unit == 0) {
- _hdrive[Unit] = CreateFile(FS_WD_DEV0NAME,
- GENERIC_READ | GENERIC_WRITE,
- FILE_SHARE_READ | FILE_SHARE_WRITE,
- NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
- NULL);
- }
- else {
- _hdrive[Unit] = CreateFile(FS_WD_DEV1NAME,
- GENERIC_READ | GENERIC_WRITE,
- FILE_SHARE_READ | FILE_SHARE_WRITE,
- NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
- NULL);
- }
- for (i = 0; i < FS_WD_CACHENUM; i++) {
- _FS_wd_cache[Unit][i].block = -1;
- }
- _FS_wd_cache_index[Unit] = 0;
- for (i = 0; i < FS_WD_WBUFFNUM; i++) {
- _FS_wd_wbuffer[Unit][i].block = -1;
- }
- return FS_LBL_MEDIACHANGED;
- }
- return 0;
- }
- /*********************************************************************
- *
- * _FS_WD_DevRead
- *
- Description:
- FS driver function. Read a sector from the media.
- Parameters:
- Unit - Unit number.
- Sector - Sector to be read from the device.
- pBuffer - Pointer to buffer for storing the data.
-
- Return value:
- ==0 - Sector has been read and copied to pBuffer.
- <0 - An error has occured.
- */
- static int _FS_WD_DevRead(FS_u32 Unit, FS_u32 Sector, void *pBuffer) {
- DWORD bytenum;
- BOOL success;
- int i;
- int x;
- x = 0;
- /* check if pBuffer in wbuffer */
- i = 0;
- while (i < FS_WD_WBUFFNUM) {
- if (_FS_wd_wbuffer[Unit][i].block == Sector) {
- FS__CLIB_memcpy(pBuffer, _FS_wd_wbuffer[Unit][i].buffer, 512);
- return 0;
- }
- i++;
- }
- for (i = 0; i < FS_WD_CACHENUM; i++) {
- if (_FS_wd_cache[Unit][i].block == Sector) {
- FS__CLIB_memcpy(pBuffer, _FS_wd_cache[Unit][i].buffer, 512);
- return 0;
- }
- }
- SetFilePointer(_hdrive[Unit],Sector * 512, 0, FILE_BEGIN);
- success = ReadFile(_hdrive[Unit], pBuffer, 512, &bytenum, NULL);
- if (!success) {
- x = -1;
- }
- _FS_wd_cache[Unit][_FS_wd_cache_index[Unit]].block = Sector;
- FS__CLIB_memcpy(_FS_wd_cache[Unit][_FS_wd_cache_index[Unit]].buffer, pBuffer, 512);
- _FS_wd_cache_index[Unit]++;
- if (_FS_wd_cache_index[Unit] >= FS_WD_CACHENUM) {
- _FS_wd_cache_index[Unit] = 0;
- }
- return x;
- }
- /*********************************************************************
- *
- * _FS_WD_DevWrite
- *
- Description:
- FS driver function. Write sector to the media.
- Parameters:
- Unit - Unit number.
- Sector - Sector to be written to the device.
- pBuffer - Pointer to data to be stored.
-
- Return value:
- ==0 - Sector has been written to the device.
- <0 - An error has occured.
- */
- static int _FS_WD_DevWrite(FS_u32 Unit, FS_u32 Sector, void *pBuffer) {
- DWORD bytenum;
- BOOL success;
- int i;
- int j;
- int x;
- x = 0;
- /* clear in read cache */
- for (i = 0; i < FS_WD_CACHENUM; i++) {
- if (_FS_wd_cache[Unit][i].block == Sector) {
- _FS_wd_cache[Unit][i].block = -1;
- }
- }
- /* check if pBuffer in wbuffer */
- i = 0;
- while (i < FS_WD_WBUFFNUM) {
- if (_FS_wd_wbuffer[Unit][i].block == Sector) {
- FS__CLIB_memcpy(_FS_wd_wbuffer[Unit][i].buffer, pBuffer, 512);
- return 0;
- }
- i++;
- }
- /* check for free wbuffer */
- i = 0;
- while (i < FS_WD_WBUFFNUM) {
- if (_FS_wd_wbuffer[Unit][i].block == -1) {
- FS__CLIB_memcpy(_FS_wd_wbuffer[Unit][i].buffer, pBuffer, 512);
- _FS_wd_wbuffer[Unit][i].block = Sector;
- return 0;
- }
- i++;
- }
- /* write back complete cache */
- i = 0;
- while (1) {
- if (i >= FS_WD_WBUFFNUM) {
- break; /* End of cache reached */
- }
- if (_FS_wd_wbuffer[Unit][i].block != -1) {
- break; /* Valid cache entry found */
- }
- i++;
- }
- while (i < FS_WD_WBUFFNUM) {
- for (j = 0; j < FS_WD_WBUFFNUM; j++) {
- if (_FS_wd_wbuffer[Unit][j].block != -1) {
- if (_FS_wd_wbuffer[Unit][j].block < _FS_wd_wbuffer[Unit][i].block) {
- i = j;
- }
- }
- }
- if (_FS_wd_wbuffer[Unit][i].block != -1) {
- SetFilePointer(_hdrive[Unit], _FS_wd_wbuffer[Unit][i].block * 512, 0, FILE_BEGIN);
- success = WriteFile(_hdrive[Unit], _FS_wd_wbuffer[Unit][i].buffer, 512, &bytenum, NULL);
- if (!success) {
- x = -1;
- }
- _FS_wd_wbuffer[Unit][i].block = -1;
- }
- i = 0;
- while (1) {
- if (i >= FS_WD_WBUFFNUM) {
- break; /* End of cache reached. */
- }
- if (_FS_wd_wbuffer[Unit][i].block != -1) {
- break; /* Valid entry found */
- }
- i++;
- }
- }
- FS__CLIB_memcpy(_FS_wd_wbuffer[Unit][0].buffer, pBuffer, 512);
- _FS_wd_wbuffer[Unit][0].block = Sector;
- return x;
- }
- /*********************************************************************
- *
- * _FS_WD_DevIoCtl
- *
- Description:
- FS driver function. Execute device command.
- Parameters:
- Unit - Unit number.
- Cmd - Command to be executed.
- Aux - Parameter depending on command.
- pBuffer - Pointer to a buffer used for the command.
-
- Return value:
- Command specific. In general a negative value means an error.
- */
- static int _FS_WD_DevIoCtl(FS_u32 Unit, FS_i32 Cmd, FS_i32 Aux, void *pBuffer) {
- FS_u32 *info;
- DWORD bytenum;
- BOOL success;
- int i;
- int x;
- int lexp;
- x = 0;
- if (Cmd == FS_CMD_FLUSH_CACHE) {
- if (_online[Unit]) {
- i = 0;
- while (i < FS_WD_WBUFFNUM) {
- if (_FS_wd_wbuffer[Unit][i].block != -1) {
- SetFilePointer(_hdrive[Unit], _FS_wd_wbuffer[Unit][i].block * 512, 0, FILE_BEGIN);
- success = WriteFile(_hdrive[Unit], _FS_wd_wbuffer[Unit][i].buffer, 512, &bytenum, NULL);
- if (!success) {
- x = -1;
- }
- _FS_wd_wbuffer[Unit][i].block = -1;
- }
- i++;
- }
- CloseHandle(_hdrive[Unit]);
- _online[Unit] = 0;
- }
- }
- else if (Cmd == FS_CMD_GET_DEVINFO) {
- if (!pBuffer) {
- return -1;
- }
- if (!_online[Unit]) {
- if (Unit == 0) {
- _hdrive[Unit] = CreateFile(FS_WD_DEV0NAME,
- GENERIC_READ | GENERIC_WRITE,
- FILE_SHARE_READ | FILE_SHARE_WRITE,
- NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
- NULL);
- }
- else {
- _hdrive[Unit] = CreateFile(FS_WD_DEV1NAME,
- GENERIC_READ | GENERIC_WRITE,
- FILE_SHARE_READ | FILE_SHARE_WRITE,
- NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
- NULL);
- }
- }
- SetFilePointer(_hdrive[Unit], 0, 0, FILE_BEGIN);
- success = ReadFile(_hdrive[Unit], _workbuffer, 512, &bytenum, NULL);
- lexp = !success;
- lexp = lexp || (_workbuffer[510] != 0x55);
- lexp = lexp || (_workbuffer[511] != 0xaa);
- if (lexp) {
- if (!_online[Unit]) {
- CloseHandle(_hdrive[Unit]);
- }
- return -1;
- }
- info = pBuffer;
- /* hidden */
- *info = (FS_u32)_workbuffer[28] + 0x100UL * _workbuffer[29] + 0x10000UL * _workbuffer[30] + 0x1000000UL * _workbuffer[31];
- info++;
- /* headnum */
- *info = (FS_u32)_workbuffer[26] + 0x100UL * _workbuffer[27];
- info++;
- /* secpertrk */
- *info = (FS_u32)_workbuffer[24] + 0x100UL * _workbuffer[25];
- info++;
- /* total sectors */
- *info = (FS_u32)_workbuffer[32] + 0x100UL * _workbuffer[33] + 0x10000UL * _workbuffer[34] + 0x1000000UL * _workbuffer[35]
- + _workbuffer[19] + 0x100UL * _workbuffer[20];
- if (!_online[Unit]) {
- CloseHandle(_hdrive[Unit]);
- }
- }
- return x;
- }
- /*********************************************************************
- *
- * Global variables
- *
- **********************************************************************
- */
- const FS__device_type FS__windrive_driver = {
- "Windrive driver",
- _FS_WD_DevStatus,
- _FS_WD_DevRead,
- _FS_WD_DevWrite,
- _FS_WD_DevIoCtl
- };
- #endif /* FS_USE_WINDRIVE_DRIVER */