kern
annotate src/boot/mboot.S @ 83:4ef83db5f4cd
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| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Tue, 06 Dec 2011 15:53:57 +0200 |
| parents | 7f9af8cddc96 |
| children |
| rev | line source |
|---|---|
| nuclear@0 | 1 #define MAGIC 0x1badb002 |
| nuclear@16 | 2 /* flags with bit 1 set means we need memory info */ |
| nuclear@16 | 3 #define FLAGS 2 |
| nuclear@0 | 4 #define STACK_SIZE 0x4000 |
| nuclear@0 | 5 |
| nuclear@0 | 6 .text |
| nuclear@0 | 7 .align 4 |
| nuclear@1 | 8 |
| nuclear@0 | 9 /* multiboot header */ |
| nuclear@0 | 10 .long MAGIC |
| nuclear@0 | 11 .long FLAGS |
| nuclear@0 | 12 .long -(MAGIC + FLAGS) /* checksum */ |
| nuclear@0 | 13 |
| nuclear@1 | 14 .globl kentry |
| nuclear@0 | 15 kentry: |
| nuclear@0 | 16 /* setup a temporary kernel stack */ |
| nuclear@0 | 17 movl $(stack + STACK_SIZE), %esp |
| nuclear@0 | 18 /* reset eflags register */ |
| nuclear@0 | 19 pushl $0 |
| nuclear@0 | 20 popf |
| nuclear@16 | 21 /* call the kernel main function. ebx points to the |
| nuclear@16 | 22 * multiboot information structure */ |
| nuclear@16 | 23 push %ebx |
| nuclear@0 | 24 call kmain |
| nuclear@0 | 25 /* we dropped out of main, halt the CPU */ |
| nuclear@0 | 26 cli |
| nuclear@0 | 27 hlt |
| nuclear@0 | 28 |
| nuclear@0 | 29 /* space for the temporary kernel stack */ |
| nuclear@0 | 30 .comm stack, STACK_SIZE |