AMI uefi bios 定时器的使用

最新推荐文章于 2024-11-28 10:53:04 发布

原创最新推荐文章于 2024-11-28 10:53:04 发布 · 575 阅读

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CC 4.0 BY-SA版权

本文探讨了在UEFI环境下使用EFI Boot Services创建和管理定时器的示例，展示了如何利用`Timeout`回调函数实现周期性输出。核心内容包括事件处理和定时器设置。

//www.lab-z.com

//感谢这位大哥的无私奉献!!!

#include <Uefi.h>
#include <Library/UefiLib.h>
//#include <Library/ShellCEntryLib.h>

//#include <stdio.h>
//#include <stdlib.h>
//#include <wchar.h>

//#include <Protocol/EfiShell.h>
//#include <Library/ShellLib.h>

#include <Protocol/SimpleFileSystem.h>
#include <Protocol/BlockIo.h>
#include <Library/DevicePathLib.h>
//#include <Library/HandleParsingLib.h>
#include <Library/SortLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/BaseMemoryLib.h>

extern EFI_BOOT_SERVICES *gBS;
extern EFI_SYSTEM_TABLE *gST;
extern EFI_RUNTIME_SERVICES *gRT;

//extern EFI_SHELL_ENVIRONMENT2 *mEfiShellEnvironment2;
extern EFI_HANDLE gImageHandle;

STATIC CONST UINTN SecondsToNanoSeconds = 10000000;

UINTN Counter = 0;
/**
The callback function for the timer event used to get map.

@param[in] Event The event this function is registered to.
@param[in] Context The context registered to the event.
**/
VOID
EFIAPI
Timeout (
IN EFI_EVENT Event,
IN VOID *Context
)
{
Print(L"www.lab-z.com [%d]\r\n",++ Counter);
return ;
}

int main_timer(void )
{
EFI_STATUS Status;
EFI_HANDLE TimerOne = NULL;
BOOLEAN                   ExitMark=FALSE;

Status = gBS->CreateEvent (
EVT_NOTIFY_SIGNAL | EVT_TIMER,
TPL_CALLBACK,
Timeout,
NULL,
&TimerOne
);

if (EFI_ERROR (Status)) {
Print(L"Create Event Error! \r\n");
       return 1;
}

Status = gBS->SetTimer (
TimerOne,
TimerPeriodic,
MultU64x32 (SecondsToNanoSeconds, 1)
);

if (EFI_ERROR (Status)) {
Print(L"Set Timer Error! \r\n");
return 2;
}

   while (!ExitMark)
   {
       //if (mEfiShellEnvironment2 -> GetExecutionBreak()) {ExitMark=TRUE;}

       if(Counter>5){
ExitMark=TRUE;
       }
   }
gBS->SetTimer (TimerOne, TimerCancel, 0);
gBS->CloseEvent (TimerOne);

return EFI_SUCCESS;
}