annotate src/intr-asm.S @ 29:8ea6debe4265
starting on the task switching implementation
| author |
John Tsiombikas <nuclear@siggraph.org> |
| date |
Sat, 23 Apr 2011 00:51:18 +0300 |
| parents |
cccaa40f5432 |
| children |
f65b348780e3 |
| rev |
line source |
|
nuclear@11
|
1 .data
|
|
nuclear@11
|
2 .align 4
|
|
nuclear@11
|
3 .short 0
|
|
nuclear@11
|
4 /* memory reserved for set_idt */
|
|
nuclear@11
|
5 lim:.short 0
|
|
nuclear@11
|
6 addr:.long 0
|
|
nuclear@11
|
7
|
|
nuclear@11
|
8 .text
|
|
nuclear@11
|
9 /* set_idt(uint32_t addr, uint16_t limit)
|
|
nuclear@11
|
10 * loads the IDTR with the new address and limit for the IDT */
|
|
nuclear@11
|
11 .globl set_idt
|
|
nuclear@11
|
12 set_idt:
|
|
nuclear@11
|
13 movl 4(%esp), %eax
|
|
nuclear@11
|
14 movl %eax, (addr)
|
|
nuclear@11
|
15 movw 8(%esp), %ax
|
|
nuclear@11
|
16 movw %ax, (lim)
|
|
nuclear@11
|
17 lidt (lim)
|
|
nuclear@11
|
18 ret
|
|
nuclear@11
|
19
|
|
nuclear@25
|
20 /* get_intr_state()
|
|
nuclear@25
|
21 * returns 1 if interrutps are enabled, 0 if disabled */
|
|
nuclear@25
|
22 .globl get_intr_state
|
|
nuclear@25
|
23 get_intr_state:
|
|
nuclear@25
|
24 pushf
|
|
nuclear@25
|
25 popl %eax
|
|
nuclear@25
|
26 shr $9, %eax /* bit 9 of eflags is IF */
|
|
nuclear@25
|
27 andl $1, %eax
|
|
nuclear@25
|
28 ret
|
|
nuclear@25
|
29
|
|
nuclear@25
|
30 /* set_intr_state(int state)
|
|
nuclear@25
|
31 * enables interrupts if the argument is non-zero, disables them otherwise */
|
|
nuclear@25
|
32 .globl set_intr_state
|
|
nuclear@25
|
33 set_intr_state:
|
|
nuclear@25
|
34 cmpl $0, 4(%esp)
|
|
nuclear@25
|
35 jz 0f
|
|
nuclear@25
|
36 sti
|
|
nuclear@25
|
37 ret
|
|
nuclear@25
|
38 0: cli
|
|
nuclear@25
|
39 ret
|
|
nuclear@25
|
40
|
|
nuclear@25
|
41
|
|
nuclear@11
|
42 /* interrupt entry with error code macro
|
|
nuclear@11
|
43 * this macro generates an interrupt entry point for the
|
|
nuclear@11
|
44 * exceptions which include error codes in the stack frame
|
|
nuclear@11
|
45 */
|
|
nuclear@11
|
46 .macro ientry_err n name
|
|
nuclear@11
|
47 .globl intr_entry_\name
|
|
nuclear@11
|
48 intr_entry_\name:
|
|
nuclear@11
|
49 pushl $\n
|
|
nuclear@11
|
50 jmp intr_entry_common
|
|
nuclear@11
|
51 .endm
|
|
nuclear@11
|
52
|
|
nuclear@11
|
53 /* interrupt entry without error code macro
|
|
nuclear@11
|
54 * this macro generates an interrupt entry point for the interrupts
|
|
nuclear@11
|
55 * and exceptions which do not include error codes in the stack frame
|
|
nuclear@11
|
56 * it pushes a dummy error code (0), to make the stack frame identical
|
|
nuclear@11
|
57 */
|
|
nuclear@11
|
58 .macro ientry_noerr n name
|
|
nuclear@11
|
59 .globl intr_entry_\name
|
|
nuclear@11
|
60 intr_entry_\name:
|
|
nuclear@11
|
61 pushl $0
|
|
nuclear@11
|
62 pushl $\n
|
|
nuclear@11
|
63 jmp intr_entry_common
|
|
nuclear@11
|
64 .endm
|
|
nuclear@11
|
65
|
|
nuclear@11
|
66 /* common code used by all entry points. calls dispatch_intr()
|
|
nuclear@11
|
67 * defined in intr.c
|
|
nuclear@11
|
68 */
|
|
nuclear@11
|
69 .extern dispatch_intr
|
|
nuclear@11
|
70 intr_entry_common:
|
|
nuclear@11
|
71 pusha
|
|
nuclear@11
|
72 call dispatch_intr
|
|
nuclear@11
|
73 popa
|
|
nuclear@11
|
74 /* remove error code and intr num from stack */
|
|
nuclear@11
|
75 add $8, %esp
|
|
nuclear@11
|
76 iret
|
|
nuclear@11
|
77
|
|
nuclear@11
|
78 /* by including interrupts.h with ASM defined, the macros above
|
|
nuclear@11
|
79 * are expanded to generate all required interrupt entry points
|
|
nuclear@11
|
80 */
|
|
nuclear@11
|
81 #define ASM
|
|
nuclear@11
|
82 #include <interrupts.h>
|
