kern
annotate src/mboot.S @ 1:ebe5e0e44a9d
pretty much finished the code for article 1, might do minor adjustments though
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Thu, 02 Dec 2010 08:45:41 +0200 |
| parents | 662ff2170531 |
| children | af6f4adc43d6 |
| rev | line source |
|---|---|
| nuclear@0 | 1 #define MAGIC 0x1badb002 |
| nuclear@0 | 2 #define FLAGS 0 |
| nuclear@0 | 3 #define STACK_SIZE 0x4000 |
| nuclear@0 | 4 |
| nuclear@0 | 5 .text |
| nuclear@0 | 6 .align 4 |
| nuclear@1 | 7 |
| nuclear@0 | 8 /* multiboot header */ |
| nuclear@0 | 9 .long MAGIC |
| nuclear@0 | 10 .long FLAGS |
| nuclear@0 | 11 .long -(MAGIC + FLAGS) /* checksum */ |
| nuclear@0 | 12 .fill 5, 4 /* fill out the rest with zeroes */ |
| 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@0 | 21 /* call the kernel main function */ |
| nuclear@0 | 22 call kmain |
| nuclear@0 | 23 /* we dropped out of main, halt the CPU */ |
| nuclear@0 | 24 cli |
| nuclear@0 | 25 hlt |
| nuclear@0 | 26 |
| nuclear@0 | 27 /* space for the temporary kernel stack */ |
| nuclear@0 | 28 .comm stack, STACK_SIZE |