我寫了一個 File io 的 EFI shell app
/** myfileio.c
* Apps
*/
#include "efi.h"
#include "efilib.h"
#define FILE_ATTRIB_CREATENEW EFI_FILE_MODE_READ| EFI_FILE_MODE_WRITE | EFI_FILE_MODE_CREATE
static EFI_STATUS WaitForKeyOrReset(VOID)
{
EFI_STATUS Status;
EFI_INPUT_KEY key;
UINTN index;
for(;;) {
Status = ST->ConIn->ReadKeyStroke(ST->ConIn, &key);
if (Status == EFI_NOT_READY)
BS->WaitForEvent(1, &ST->ConIn->WaitForKey, &index);
else
break;
}
if (!EFI_ERROR(Status)) {
if (key.ScanCode == SCAN_ESC)
RT->ResetSystem(EfiResetCold, EFI_SUCCESS, 0, NULL);
}
return Status;
}
EFI_STATUS
EFIAPI
MyfileioMain (IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable)
{
EFI_STATUS Status;
EFI_HANDLE *DestAddr;
EFI_LOADED_IMAGE *FileHandle01;
EFI_DEVICE_PATH *FileHandle02;
EFI_FILE_IO_INTERFACE *FileHandle03;
EFI_FILE *FileHandle04;
EFI_FILE *FileHandle05;
CHAR16 *FileName;
CHAR16 *BufferA, *BufferB, *BufferC, *Space_Key;
UINTN BufferSize = 8, BufferSizeKeySpace = 2;
int Bit0, Bit1, Key_Space;
FileName = L"NewFile.txt";
Space_Key = L" ";
BufferA = L"ABCD";
BufferB = L"EFGH";
BufferC = L"IJKL";
Bit0 = 0xff;
Bit1 = 0xfe;
Key_Space = 0x0020;
InitializeLib (ImageHandle, SystemTable);
DestAddr = AllocatePool (BufferSize);
Print (L"Value of Bit0 is %x\n", Bit0);
Print (L"Value of Bit1 is %x\n", Bit1);
Status = BS->HandleProtocol(ImageHandle, &LoadedImageProtocol, (VOID*)&FileHandle01);
if (EFI_ERROR(Status)) {
Print (L"Could not obtain Image, FileHandle01 err code is %x\n",Status);
return EFI_LOAD_ERROR;
}
Status = BS->HandleProtocol(FileHandle01->DeviceHandle,&DevicePathProtocol,(VOID*)&FileHandle02);
if (EFI_ERROR(Status)) {
Print (L"Could not obtain Device Path, FileHandle02 err code is %x\n",Status);
return EFI_LOAD_ERROR;
}
Status = BS->HandleProtocol (FileHandle01->DeviceHandle,&FileSystemProtocol,(VOID*)&FileHandle03);
if (EFI_ERROR(Status)) {
Print (L"Could not obtain File System, FileHandle03 err code is %x\n",Status);
return EFI_LOAD_ERROR;
}
Status = FileHandle03->OpenVolume(FileHandle03, &FileHandle04);
if (EFI_ERROR(Status)) {
Print (L"Could not open volume, FileHandle04 err code is %x\n",Status);
return EFI_LOAD_ERROR;
}
Status = FileHandle04->Open(FileHandle04, &FileHandle05, FileName, FILE_ATTRIB_CREATENEW, 0x20);
if (EFI_ERROR(Status)) {
Print (L"Could not open file, FileHandle05 err code is %x\n",Status);
return EFI_LOAD_ERROR;
}
Status = FileHandle05->SetPosition(FileHandle05, 0);
if (EFI_ERROR(Status)) {
Print (L"Could not do SetPositioon to the file, FileHandle05 err code is %x\n",Status);
return EFI_SUCCESS;
}
Status = FileHandle05->Write(FileHandle05, &BufferSize, &Bit0);
Print (L"File Buffersize is %x\n\n", BufferSize);
if (EFI_ERROR(Status)) {
Print (L"Could not write file, FileHandle05 err code is %x\n\n",Status);
return EFI_SUCCESS;
}
Status = FileHandle05->SetPosition(FileHandle05, 1);
if (EFI_ERROR(Status)) {
Print (L"Could not do SetPositioon to the file, FileHandle05 err code is %x\n",Status);
return EFI_SUCCESS;
}
Status = FileHandle05->Write(FileHandle05, &BufferSize, &Bit1);
Print (L"File Buffersize is %x\n\n", BufferSize);
if (EFI_ERROR(Status)) {
Print (L"Could not write file, FileHandle05 err code is %x\n\n",Status);
return EFI_SUCCESS;
}
Status = FileHandle05->SetPosition(FileHandle05, 2);
if (EFI_ERROR(Status)) {
Print (L"Could not do SetPositioon to the file, FileHandle05 err code is %x\n",Status);
return EFI_SUCCESS;
}
Status = FileHandle05->Write(FileHandle05, &BufferSize, BufferA);
Print (L"File Buffersize is %x\n\n", BufferSize);
if (EFI_ERROR(Status)) {
Print (L"Could not write file, FileHandle05 err code is %x\n\n",Status);
return EFI_SUCCESS;
}
//--------------------------------------------------------------------------------------------------------------------------------------------------------------->>>
Print (L"Before Read FileHandle05 file Data of BufferB is %s\n\n",BufferB);
Status = FileHandle05->SetPosition(FileHandle05, 2);
if (EFI_ERROR(Status)) {
Print (L"Could not do SetPositioon to the file, FileHandle05 err code is %x\n",Status);
return EFI_SUCCESS;
}
Status = FileHandle05->Read(FileHandle05, &BufferSize, BufferB);
if (EFI_ERROR(Status)) {
Print (L"Could not read file, FileHandle05 err code is %x\n",Status);
return EFI_SUCCESS;
}
Print(L"1. After Read FileHandle05 file of Data of BufferSize is %d and Data of BufferB is %s\n\n", BufferSize, BufferB);
//---------------------------------------------------------------------------------------------------------------------------------------------------------------<<<
Status = FileHandle05->SetPosition(FileHandle05, 10);
if (EFI_ERROR(Status)) {
Print (L"Could not do SetPositioon to the file, FileHandle05 err code is %x\n",Status);
return EFI_SUCCESS;
}
Status = FileHandle05->Write(FileHandle05, &BufferSizeKeySpace, Space_Key);
if (EFI_ERROR(Status)) {
Print (L"Could not write file, FileHandle05 err code is %x\n",Status);
return EFI_SUCCESS;
}
Status = FileHandle05->SetPosition(FileHandle05, 12);
if (EFI_ERROR(Status)) {
Print (L"Could not do SetPositioon to the file, FileHandle05 err code is %x\n",Status);
return EFI_SUCCESS;
}
Status = FileHandle05->Write(FileHandle05, &BufferSizeKeySpace, Space_Key);
if (EFI_ERROR(Status)) {
Print (L"Could not write file, FileHandle05 err code is %x\n",Status);
return EFI_SUCCESS;
}
Status = FileHandle05->SetPosition(FileHandle05, 14);
if (EFI_ERROR(Status)) {
Print (L"Could not do SetPositioon to the file, FileHandle05 err code is %x\n",Status);
return EFI_SUCCESS;
}
Status = FileHandle05->Write(FileHandle05, &BufferSizeKeySpace, Space_Key);
if (EFI_ERROR(Status)) {
Print (L"Could not write file, FileHandle05 err code is %x\n",Status);
return EFI_SUCCESS;
}
Status = FileHandle05->SetPosition(FileHandle05, 16);
if (EFI_ERROR(Status)) {
Print (L"Could not do SetPositioon to the file, FileHandle05 err code is %x\n",Status);
return EFI_SUCCESS;
}
Status = FileHandle05->Write(FileHandle05, &BufferSizeKeySpace, Space_Key);
if (EFI_ERROR(Status)) {
Print (L"Could not write file, FileHandle05 err code is %x\n",Status);
return EFI_SUCCESS;
}
//---------------------------------------------------------------------------------------------------------------------------------------------------------------
Status = FileHandle05->SetPosition(FileHandle05, 18);
if (EFI_ERROR(Status)) {
Print (L"Could not do SetPositioon to the file, FileHandle05 err code is %x\n",Status);
return EFI_SUCCESS;
}
Status = FileHandle05->Write(FileHandle05, &BufferSize, BufferC);
if (EFI_ERROR(Status)) {
Print (L"Could not write file, FileHandle05 err code is %x\n",Status);
return EFI_SUCCESS;
}
FreePool(DestAddr);
Status = FileHandle05->Close(FileHandle05);
if (EFI_ERROR(Status)) {
Print (L"Could not close file, FileHandle05 err code is %x\n",Status);
return EFI_SUCCESS;
}
Print(L"File Name = %s has already been created.\n", FileName);
Print(L"\nPress ESC to reboot or any other key to return control to the firmware.\n\n");
WaitForKeyOrReset();
return Status;
}
pci register access sample
//**********************************************************************//**********************************************************************
//** Demo code for PCI configuration space I/O access program **
//** By Lawrence 2009/11/20 @Taiwan**
//**********************************************************************
//**********************************************************************
#include "efi.h"
#include "efilib.h"
#define Not_Found_Me 0x00000000
#define Found_Me 0x00000001
static EFI_STATUS WaitForKeyOrReset(VOID)
{
EFI_STATUS Status;
EFI_INPUT_KEY key;
UINTN index;
for(;;) {
Status = ST->ConIn->ReadKeyStroke(ST->ConIn, &key);
if (Status == EFI_NOT_READY)
BS->WaitForEvent(1, &ST->ConIn->WaitForKey, &index);
else
break;
}
if (!EFI_ERROR(Status)) {
if (key.ScanCode == SCAN_ESC)
RT->ResetSystem(EfiResetCold, EFI_SUCCESS, 0, NULL);
}
return Status;
}
UINTN
AccessPciConfig (
INEFI_PCI_IO_PROTOCOL *PCI_DEVICE_TARGET
)
{
UINT8i;
UINTNPCI_ATTR;
UINT8PCI_REG, pci_offset=0;
//get device attr
PCI_DEVICE_TARGET->GetLocation(PCI_DEVICE_TARGET,PCI_ATTR,PCI_ATTR+1,PCI_ATTR+2,PCI_ATTR+3);
if ((PCI_ATTR == 0x00) && (PCI_ATTR == 0x1e) && (PCI_ATTR == 0x00)){
Print (L"Device found at BUS = %02x DEV= %02x FUN= %02x\n",PCI_ATTR,PCI_ATTR,PCI_ATTR);
ST->ConOut->SetAttribute (ST->ConOut, EFI_TEXT_ATTR (EFI_GREEN, EFI_BLACK));
//print register value
for (i = 0;i < 4;i++)
{
PCI_DEVICE_TARGET->Pci.Read (PCI_DEVICE_TARGET,0,pci_offset,4,PCI_REG);
Print(L"Register0x%d value = %02x \n",i, PCI_REG);
}
Print(L"\n");
ST->ConOut->SetAttribute (ST->ConOut, EFI_TEXT_ATTR (EFI_WHITE, EFI_BLACK));
return Found_Me;
}
return Not_Found_Me;
}
EFI_STATUS
InitializePciApplication (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_HANDLE *Handle;
UINTN BufferSize, Result;
UINTN NoHandles, Index;
EFI_PCI_IO_PROTOCOL *PCI_DEVICE_TARGET;
//
// Initialize the Library.
//
InitializeLib (ImageHandle, SystemTable);
//
// Find the PCI driver
//
Handle = NULL;
BufferSize = 1;
do
{
if (Handle)
{
FreePool (Handle);
}
Handle = AllocatePool (BufferSize);
Status = BS->LocateHandle (ByProtocol, &PciIoProtocol, NULL, &BufferSize, Handle);
} while (Status == EFI_BUFFER_TOO_SMALL);
ASSERT (!EFI_ERROR(Status));
NoHandles= BufferSize / sizeof(EFI_HANDLE);
Index = 0;
ST->ConOut->ClearScreen (ST->ConOut);
Result = Not_Found_Me;
do
{
if(Index == NoHandles - 1)
Index=0;
else
Status = BS->HandleProtocol (Handle, &PciIoProtocol, (VOID*)&PCI_DEVICE_TARGET);
Print(L"THIS IS DEVICE %d \n",Index);
if (!EFI_ERROR(Status))
{
Result = AccessPciConfig(PCI_DEVICE_TARGET);
//- Print(L"Again now Result is %x \n",Result);
}
Index++;
} while(Result == Not_Found_Me);
Print(L"Please hit any key to exit this image.");
WaitForSingleEvent (ST->ConIn->WaitForKey, 0);
return EFI_SUCCESS;
}
感激不尽
小弟对你有如滔滔江水。。。 都是强人。向你们学习！ 楼主 好厉害 我接受bios tranning 两周也没有写出这样的的底层程式！楼主强人哈！学习了！ 景仰一下，哈哈 新手，学习
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