annotate src/segm-asm.S @ 12:eaec918de072
- fixed the scrolling issue
- other minor crap
| author |
John Tsiombikas <nuclear@member.fsf.org> |
| date |
Tue, 22 Feb 2011 18:51:44 +0200 |
| parents |
611b2d66420b |
| children |
4eaecb14fe31 |
| rev |
line source |
|
nuclear@7
|
1 .data
|
|
nuclear@8
|
2 .align 4
|
|
nuclear@8
|
3 /* memory reserved for setup_selectors */
|
|
nuclear@7
|
4 off:.long 0
|
|
nuclear@7
|
5 seg:.short 0
|
|
nuclear@8
|
6 /* memory reserved for set_gdt */
|
|
nuclear@8
|
7 lim:.short 0
|
|
nuclear@8
|
8 addr:.long 0
|
|
nuclear@7
|
9
|
|
nuclear@7
|
10 .text
|
|
nuclear@7
|
11 /* setup_selectors(uint16_t code, uint16_t data)
|
|
nuclear@7
|
12 * loads the requested selectors to all the selector registers */
|
|
nuclear@7
|
13 .globl setup_selectors
|
|
nuclear@7
|
14 setup_selectors:
|
|
nuclear@8
|
15 /* set data selectors directly */
|
|
nuclear@7
|
16 movl 8(%esp), %eax
|
|
nuclear@7
|
17 movw %ax, %ss
|
|
nuclear@7
|
18 movw %ax, %es
|
|
nuclear@7
|
19 movw %ax, %ds
|
|
nuclear@7
|
20 movw %ax, %gs
|
|
nuclear@7
|
21 movw %ax, %fs
|
|
nuclear@8
|
22 /* set cs using a long jump */
|
|
nuclear@7
|
23 movl 4(%esp), %eax
|
|
nuclear@7
|
24 movw %ax, (seg)
|
|
nuclear@7
|
25 movl $ldcs, (off)
|
|
nuclear@7
|
26 ljmp *off
|
|
nuclear@7
|
27 ldcs:
|
|
nuclear@7
|
28 ret
|
|
nuclear@7
|
29
|
|
nuclear@7
|
30 /* set_gdt(uint32_t addr, uint16_t limit)
|
|
nuclear@7
|
31 * loads the GDTR with the new address and limit for the GDT */
|
|
nuclear@7
|
32 .globl set_gdt
|
|
nuclear@7
|
33 set_gdt:
|
|
nuclear@7
|
34 movl 4(%esp), %eax
|
|
nuclear@8
|
35 movl %eax, (addr)
|
|
nuclear@7
|
36 movw 8(%esp), %ax
|
|
nuclear@8
|
37 movw %ax, (lim)
|
|
nuclear@8
|
38 lgdt (lim)
|
|
nuclear@7
|
39 ret
|
