技術標籤：UEFI

1. 建立虛擬盤

	dd if=/dev/zero of=~/hda.img bs=1 count=10M	#1、建立img檔案
	mkfs -t vfat ~/hda.img 						#2、將檔案重置為FAT格式
	sudo losetup /dev/loop0 ~/hda.img 			#3、對映到loop裝置

2. HelloWorld例項

1. HelloWorld/HelloWorld.c

#include <Uefi.h> 
#include <Library/UefiLib.h> 
#include <Library/BaseLib.h>
#include
 
 <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiBootServicesTableLib.h>

//ShellCEntryLib call user interface ShellAppMain
EFI_STATUS
EFIAPI
HelloWorldEntry(
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
)
{   
  EFI_STATUS  Status =
 
 EFI_SUCCESS;
  Print (L"[Console]  HelloWorldEntry Start..\n");
  
  Print (L"[Console]  HelloWorldEntry  End ... \n"); 
  return Status;
}

2. HelloWorld/HelloWorld.inf

[Defines]
  INF_VERSION = 0x00010007 
  BASE_NAME = HelloWorld
  FILE_GUID = 69A6DE6D-FA9F-485E-9A4E-EA70FDCFD82F
  MODULE_TYPE = UEFI_APPLICATION
  VERSION_STRING = 1.0
  ENTRY_POINT = HelloWorldEntry 
  
[Sources] 
  HelloWorld.c 
  
[Packages]
  MdePkg/MdePkg.dec
  ShellPkg/ShellPkg.dec 
  MdeModulePkg/MdeModulePkg.dec
  
[LibraryClasses]
  ShellCEntryLib
  BaseLib
  BaseMemoryLib
  DebugLib
  PrintLib
  UefiBootServicesTableLib
  MemoryAllocationLib
  UefiLib
 

3. OvmfPkgX64.dsc

ShellCEntryLib|ShellPkg/Library/UefiShellCEntryLib/UefiShellCEntryLib.inf

4. OvmfPkgX64.fdf

INF OvmfPkg/HelloWorld/HelloWorld.inf

3編譯

build -a X64 -p OvmfPkg/OvmfPkgX64.dsc
cp HelloWorld.efi /media/fan/1173-7859/ #我電腦掛載裝置名為1173-7859（每次都不一樣）
sudo qemu-system-x86_64 -bios OVMF.fd -hda /dev/loop0

結論

重啟電腦之後會列印成功，不知道是因為什麼引起的。後面有時間再來討論