WinCE6下的kernelIoControl可不是誰都可以調的。

這個可能很多人曾經知道，但是老是忘記，比如我，哈哈。

kerneliocontrol以前在CE5下面耍慣了，用這個接口，AP簡直可以無法無天啊，動不動就reset你，哼！who怕who（AP不要 kernelicontrol還是可以無法無天，fullkernel啊，哈哈）

最近加了一個CE6下的kerneliocontrol，這種事情不曉得做過多少啦，所以信手拈來。

1.加IOCTL的code定義

2.加ioctl_tab.h里面的table里面code和function的關聯

3.加ioctl.c里面function的實現。

4.在AP里面調用kerneliocontrol，參數是code，試圖訪問這個function

結果發現，AP每次調用kerneliocontrol都是fail，但是參數全部正確啊，暈。

NND，毛了，在function里面加了一堆debug信息，重新出image，哼看你出不出來！

結果發現，壓根沒進function。

暈again！第一反應是哪里沒有加全或者有代碼修改了但是build不到位。

check了n遍，還是不行，開始懷疑自己老年癡呆了！？

迷茫中突然想到CE6之前不是有篇文章說過，AP不能隨便調用kerneliocontrol的。

逐翻出此文。發現果然有門道在其中，但是那篇文章不夠詳細，沒有告訴我怎么才能改變權限。

翻了翻BSP(CSP)，果然找到真的有那么一個地方來決定哪些IOCTL的code是允許被AP call的。

PFN_Ioctl g_pfnExtOALIoctl;

//------------------------------------------------------------------------------

// Function: IOControl

//

// Arguments: Same signature as KernelIoControl

//??? DWORD dwIoControlCode: io control code

//??? PBYTE pInBuf: pointer to input buffer

//??? DWORD nInBufSize: length of input buffer in bytes

//??? PBYTE pOutBuf: pointer to out buffer

//??? DWORD nOutBufSize: length of output buffer in bytes

//??? PDWORD pBytesReturned: number of bytes returned in output buffer

//

// Return Values:

// If the function call is successful, TRUE is returned from this API call.

// If the function call is not successful, FALSE is returned from this API

// call and the last error is set to:

// a) ERROR_INVALID_PARAMETER: any of the input arguments are invalid

// b) ERROR_NOT_SUPPORTED: given ioctl is not supported

// c) any other ioctl set by OAL code

//

// Abstract:

// This is called by kernel whenever a user mode thread makes a call to

// KernelIoControl or KernelLibIoControl with io control code being an OAL

// io control code. OEMs can override what ioctls a user mode thread can call

// by enabling or disabling ioctl codes in this function.

//

//------------------------------------------------------------------------------

EXTERN_C

BOOL

IOControl(

??? DWORD dwIoControlCode,

??? PBYTE pInBuf,

??? DWORD nInBufSize,

??? PBYTE pOutBuf,

??? DWORD nOutBufSize,

??? PDWORD pBytesReturned

)

{

??? BOOL fRet = FALSE;

??? //

??? // By default the following ioctls are supported for user mode threads.

??? // If a new ioctl is being added to this list, make sure the corresponding

??? // data associated with that ioctl is marshalled properly to the OAL

??? // ioctl implementation. In normal cases, one doesn't need any

??? // marshaling as first level user specified buffers are already validated

??? // by kernel that:

??? // -- the buffers are within the user process space

??? // Check out IsValidUsrPtr() function in vmlayout.h for details on kernel

??? // validation of user specified buffers. Kernel doesn't validate that the

??? // buffers are accessible; it only checks that the buffer start and end

??? // addresses are within the user process space.

??? //

?

??? switch (dwIoControlCode)

??? {

??????? case IOCTL_HAL_GET_CACHE_INFO:

??????? case IOCTL_HAL_GET_DEVICE_INFO:

??????? case IOCTL_HAL_GET_DEVICEID:

??????? case IOCTL_HAL_GET_UUID:

??????? case IOCTL_PROCESSOR_INFORMATION:

??????? case IOCTL_SET_RTC_WAKEUP_TIME:

??????? case IOCTL_HAL_GET_SYS_CLOCK_INFO:

??????? case IOCTL_HAL_GET_BTMACADDR:

??????? case IOCTL_HAL_GET_CUSTOMERNUM:

??????? case IOCTL_HAL_GET_FURTURENUM:

??????? case IOCTL_HAL_GET_OEMVALUE:

??????? case IOCTL_HAL_REBOOT:

??????????? // request is to service the ioctl - forward the call to OAL code

??????????? // OAL code will set the last error if there is a failure

??????????? fRet = (*g_pfnExtOALIoctl)(dwIoControlCode, pInBuf, nInBufSize, pOutBuf, nOutBufSize, pBytesReturned);

??????????? break;

??????? default:

??????????? SetLastError(ERROR_NOT_SUPPORTED);

??????????? break;

??? }

??? return fRet;

}

在 case里面的IOCTL是運行被AP調用的，比如上面的 IOCTL_HAL_REBOOT。

里面還有一段英文注釋，意思大概是，AP調用的kerneliocontrol都會先到這里來集合，通過這里的switch case決定是否允許調用到正真的function.只要把你的IOCTL的code加到case里面，它才能被上層AP訪問。

kernel模式的驅動要call kerneliocontrol的話應該是直接調用到真正的ioctl，不需要跑到這個鬼地方來.?
?

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