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顺便给好奇的同学放出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: