UEFI 之 HelloWorld

本文主要是介绍UEFI 之 HelloWorld，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

基础的Hello World

main.c

/*main.c */
#include <Uefi.h>
#include <Library/UefiLib.h>
#include <Library/UefiApplicationEntryPoint.h>EFI_STATUS
EFIAPI
UefiMain (IN EFI_HANDLE        ImageHandle,IN EFI_SYSTEM_TABLE  *SystemTable)
{SystemTable -> ConOut-> OutputString(SystemTable -> ConOut, L"HelloWorld\n"); return EFI_SUCCESS;
}

main.inf

##[Defines]INF_VERSION                    = 0x00010005BASE_NAME                      = main                   #输出文件的名字为 main.efiFILE_GUID                      = 6987936E-ED34-ffdb-AE97-1FA5E4ED2117MODULE_TYPE                    = UEFI_APPLICATION #模块类型：UEFI_DRIVER,DXE_DRIVER,DXE_RUNTIME_DRIVER,UEFI_APPLICATION,BASE,等VERSION_STRING                 = 1.0ENTRY_POINT                    = UefiMain               #入口函数UEFI_HII_RESOURCE_SECTION      = TRUE
#
# The following information is for reference only and not required by the build tools.
#
#  VALID_ARCHITECTURES           = IA32 X64 IPF EBC
## 源文件
[Sources]main.c# .dec里面定义 include的路径
[Packages]MdePkg/MdePkg.dec#要链接的库
[LibraryClasses]UefiApplicationEntryPointUefiLib[Protocols] 
[FeaturePcd]
[Pcd.common]
[Guids]#编译选项， = 表示选项附加到默认选项后面。 == 表示仅使用所定义的选项，弃用默认选项。
[BuildOptions]#MSFT:*_*_*_CC_FLAGS ==  /nologo /c /WX /GS- /W4 /Gs32768 /D UNICODE /O1ib2 /GL  /EHs-c- /GR- /GF /Gy /Zi /Gm /D EFI_SPECIFICATION_VERSION=0x0002000A /D TIANO_RELEASE_VERSION=0x00080006 /FAs /Oi-#MSFT:*_*_*_CC_FLAGS =   /wd4804 #MSFT:Debug_*_IA32_CC_FLAGS = #MSFT:Debug_*_X64_CC_FLAGS = #MSFT:Release_*_IA32_CC_FLAGS = #MSFT:Release_*_IA32_CC_FLAGS = #MSFT:Release_*_IA32_DLINK_FLAGS = #GCC:Release_*_IA32_CC_FLAGS = 

将inf加入到EmulatorPkg/EmulatorPkg.dsc进行比编译

[Components]
Demo/01_helloworld/main.inf

编译

source edkenv.sh
EmulatorPkg/build.sh

运行

运行Emulator后进入Shell命令行

EmulatorPkg/build.sh run
(gdb) r

Continue进入命令行
Shell> fs0: 进入fs0 目录
Emulator默认的fs0目录在edk2/Build/Emulator/DEBUG_GCC5/X64
FS0:\> main.efi

问题

问题一：
将inf加入到EmulatorPkg/EmulatorPkg.dsc进行编译出现如下问题；

edk2/Demo/01_helloworld/main.c:7:1: error: conflicting types for ‘UefiMain’UefiMain (^
In file included from <command-line>:0:0:
edk2/Build/Emulator/DEBUG_GCC5/X64/Demo/01_helloworld/main/DEBUG/AutoGen.h:67:1: note: previous declaration of ‘UefiMain’ was here
make: 对“tbuild”无需做任何事。UefiMain (

解决，是由于在函数名前少了一个宏EFIAPI

EFI_STATUS
EFIAPI
UefiMain (IN EFI_HANDLE        ImageHandle,IN EFI_SYSTEM_TABLE  *SystemTable)

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