-
Notifications
You must be signed in to change notification settings - Fork 0
/
mpos-int.S
120 lines (99 loc) · 2.47 KB
/
mpos-int.S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
###############################################################################
# INTERRUPT HANDLERS
#
# This assembly code defines handlers for the traps (software interrupts)
# understood by weensyos: that is, its system calls.
# It also contains some magic code that allows fancy boot loaders to boot
# weensyos.
#
# There is no need to understand this code in detail!
#
###############################################################################
.text
# First, some magic that makes WeensyOS follow the "Multiboot" standard.
# This magic must come first in the binary.
.globl multiboot
multiboot:
.long 0x1BADB002
.long 0
.long -0x1BADB002
# The multiboot_start routine sets the stack pointer to the top of the
# MiniprocOS's kernel stack, then jumps to the 'start' routine in mpos-kern.c.
.globl multiboot_start
multiboot_start:
movl $0x200000, %esp
pushl $0
popfl
call start
# Interrupt handlers
.align 2
sys_int48_handler:
pushl $0
pushl $48
jmp _generic_int_handler
sys_int49_handler:
pushl $0
pushl $49
jmp _generic_int_handler
sys_int50_handler:
pushl $0
pushl $50
jmp _generic_int_handler
sys_int51_handler:
pushl $0
pushl $51
jmp _generic_int_handler
sys_int52_handler:
pushl $0
pushl $52
jmp _generic_int_handler
sys_int53_handler:
pushl $0
pushl $53
jmp _generic_int_handler
sys_int54_handler:
pushl $0
pushl $54
jmp _generic_int_handler
sys_int55_handler:
pushl $0
pushl $55
jmp _generic_int_handler
sys_int56_handler:
pushl $0
pushl $56
jmp _generic_int_handler
sys_int57_handler:
pushl $0
pushl $57
jmp _generic_int_handler
.globl default_int_handler
default_int_handler:
pushl $0
jmp _generic_int_handler
_generic_int_handler:
# When we get here, the processor's interrupt mechanism has
# pushed the old task status and stack registers onto the kernel stack.
# Then one of the specific handlers pushed the interrupt number.
# Now, we complete the 'registers_t' structure by pushing the extra
# segment definitions and the general CPU registers.
pushl %ds
pushl %es
pushal
# Call the kernel's 'interrupt' function.
pushl %esp
call interrupt
# 'interrupt' should never return.
# An array of function pointers to the interrupt handlers.
.globl sys_int_handlers
sys_int_handlers:
.long sys_int48_handler
.long sys_int49_handler
.long sys_int50_handler
.long sys_int51_handler
.long sys_int52_handler
.long sys_int53_handler
.long sys_int54_handler
.long sys_int55_handler
.long sys_int56_handler
.long sys_int57_handler