一个简单的 UEFI 程序

qq_36525177

已于 2023-08-13 21:43:29 修改

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文章标签： c语言

于 2023-08-13 21:42:12 首次发布

本文链接：https://blog.youkuaiyun.com/qq_36525177/article/details/132265900

版权

main.c

#include <stdint.h>

typedef struct efi_text
{
    void *a;
    int (*output)(struct efi_text *this, const wchar_t *str);
} efi_text_t;

typedef struct
{
    char a[52];
    void *console;
    efi_text_t *text;
} efi_sys_table_t;

int efi_main(void *img_handle, efi_sys_table_t *table)
{
    table->text->output(table->text, L"Hello EFI!");
    while (1)
        ;
    return 0;
}

Makefile

CC = gcc
CFLAGS = -shared -nostdlib -mno-red-zone -fno-stack-protector -Wall -e efi_main

all: main.efi

%.efi: %.dll
	objcopy --target=efi-app-x86_64 $< $@

%.dll: %.c
	$(CC) $(CFLAGS) $< -o $@

qemu: main.efi OVMF.fd image/EFI/BOOT/BOOTX64.EFI
	qemu-system-x86_64 -nographic -bios OVMF.fd -drive file=fat:rw:image,media=disk,format=raw

image/EFI/BOOT/BOOTX64.EFI:
	mkdir -p image/EFI/BOOT
	ln -sf ../../../main.efi image/EFI/BOOT/BOOTX64.EFI

OVMF.fd:
	wget http://downloads.sourceforge.net/project/edk2/OVMF/OVMF-X64-r15214.zip
	unzip OVMF-X64-r15214.zip OVMF.fd
	rm OVMF-X64-r15214.zip

clean:
	rm -f main.efi OVMF.fd
	rm -rf image