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順便給好奇的同學(xué)放出boot.s:

1 MBOOT_PAGE_ALIGN??? equ 1<<0

2 MBOOT_MEM_INFO????? equ 1<<1

3 MBOOT_HEADER_MAGIC equ 0x1BADB002

4

5

6 MBOOT_HEADER_FLAGS equ MBOOT_PAGE_ALIGN | MBOOT_MEM_INFO

7 MBOOT_CHECKSUM????? equ -(MBOOT_HEADER_MAGIC + MBOOT_HEADER_FLAGS)

8

9

10 [BITS 32]?????????????????????? ; All instructions should be 32-bit.

11

12 [GLOBAL mboot]????????????????? ; Make 'mboot' accessible from C.

13 [EXTERN code]?????????????????? ; Start of the '.text' section.

14 [EXTERN bss]??????????????????? ; Start of the .bss section.

15 [EXTERN end]??????????????????? ; End of the last loadable section.

16

17 mboot:

18?? dd MBOOT_HEADER_MAGIC??????? ; GRUB will search for this value on each

19???????????????????????????????? ; 4-byte boundary in your kernel file

20?? dd MBOOT_HEADER_FLAGS??????? ; How GRUB should load your file / settings

21?? dd MBOOT_CHECKSUM??????????? ; To ensure that the above values are correct

22

23?? dd mboot???????????????????? ; Location of this descriptor

24?? dd code????????????????????? ; Start of kernel '.text' (code) section.

25?? dd bss?????????????????????? ; End of kernel '.data' section.

26?? dd end?????????????????????? ; End of kernel.

27?? dd start???????????????????? ; Kernel entry point (initial EIP).

28

29 [GLOBAL start]????????????????? ; Kernel entry point.

30 [EXTERN main]?????????????????? ; This is the entry point of C code

31

32 start:

33?? push??? ebx?????????????????? ; Load multiboot header location

34

35?? ; Execute the kernel:

總結(jié)

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