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
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
#include <idt.h>
#include <sys.h>
#include <string.h>
#include <dbglog.h>
void isr0();
void isr1();
void isr2();
void isr3();
void isr4();
void isr5();
void isr6();
void isr7();
void isr8();
void isr9();
void isr10();
void isr11();
void isr12();
void isr13();
void isr14();
void isr15();
void isr16();
void isr17();
void isr18();
void isr19();
void isr20();
void isr21();
void isr22();
void isr23();
void isr24();
void isr25();
void isr26();
void isr27();
void isr28();
void isr29();
void isr30();
void isr31();
void irq0();
void irq1();
void irq2();
void irq3();
void irq4();
void irq5();
void irq6();
void irq7();
void irq8();
void irq9();
void irq10();
void irq11();
void irq12();
void irq13();
void irq14();
void irq15();
void syscall64();
// ************************************************************
// Handler code
static idt_entry_t idt_entries[256];
static idt_ptr_t idt_ptr;
static isr_handler_t irq_handlers[16] = {0};
/* Called in idt_.asm when an exception fires (interrupt 0 to 31).
Tries to handle the exception, panics if fails. */
void idt_isrHandler(registers_t *regs) {
dbg_printf("/ ISR %i\n", regs->int_no);
dbg_printf("| EAX: 0x%p EBX: 0x%p ECX: 0x%p EDX: 0x%p\n", regs->eax, regs->ebx, regs->ecx, regs->edx);
dbg_printf("| EDI: 0x%p ESI: 0x%p ESP: 0x%p EBP: 0x%p\n", regs->edi, regs->esi, regs->esp, regs->ebp);
dbg_printf("| EIP: 0x%p CS : 0x%p DS : 0x%p SS : 0x%p\n", regs->eip, regs->cs, regs->ds, regs->ss);
dbg_printf("\\ EFl: 0x%p I# : 0x%p Err: 0x%p\n", regs->eflags, regs->int_no, regs->err_code);
}
/* Called in interrupt.asm when an IRQ fires (interrupt 32 to 47)
Possibly wakes up a thread that was waiting, possibly calls a handler. */
void idt_irqHandler(registers_t *regs) {
if (regs->err_code > 7) {
outb(0xA0, 0x20);
}
outb(0x20, 0x20);
dbg_printf("IRQ %i\n", regs->err_code);
if (irq_handlers[regs->err_code] != 0) {
irq_handlers[regs->err_code](regs);
}
}
/* syscall handler */
void idt_syscallHandler(registers_t *regs) {
dbg_printf("Syscall %i\n", regs->int_no);
// do nothing...
}
/* For internal use only. Sets up an entry of the IDT with given parameters. */
static void idt_setGate(uint8_t num, uint32_t base, uint16_t sel, uint8_t flags) {
idt_entries[num].base_lo = base & 0xFFFF;
idt_entries[num].base_hi = (base >> 16) & 0xFFFF;
idt_entries[num].sel = sel;
idt_entries[num].always0 = 0;
idt_entries[num].flags = flags | 0x60;
}
/* Remaps the IRQs. Sets up the IDT. */
void idt_init() {
memset((uint8_t*)&idt_entries, 0, sizeof(idt_entry_t) * 256);
//Remap the IRQ table
outb(0x20, 0x11);
outb(0xA0, 0x11);
outb(0x21, 0x20);
outb(0xA1, 0x28);
outb(0x21, 0x04);
outb(0xA1, 0x02);
outb(0x21, 0x01);
outb(0xA1, 0x01);
outb(0x21, 0x0);
outb(0xA1, 0x0);
idt_setGate(0, (int32_t)isr0, 0x08, 0x8E);
idt_setGate(1, (int32_t)isr1, 0x08, 0x8E);
idt_setGate(2, (int32_t)isr2, 0x08, 0x8E);
idt_setGate(3, (int32_t)isr3, 0x08, 0x8E);
idt_setGate(4, (int32_t)isr4, 0x08, 0x8E);
idt_setGate(5, (int32_t)isr5, 0x08, 0x8E);
idt_setGate(6, (int32_t)isr6, 0x08, 0x8E);
idt_setGate(7, (int32_t)isr7, 0x08, 0x8E);
idt_setGate(8, (int32_t)isr8, 0x08, 0x8E);
idt_setGate(9, (int32_t)isr9, 0x08, 0x8E);
idt_setGate(10, (int32_t)isr10, 0x08, 0x8E);
idt_setGate(11, (int32_t)isr11, 0x08, 0x8E);
idt_setGate(12, (int32_t)isr12, 0x08, 0x8E);
idt_setGate(13, (int32_t)isr13, 0x08, 0x8E);
idt_setGate(14, (int32_t)isr14, 0x08, 0x8E);
idt_setGate(15, (int32_t)isr15, 0x08, 0x8E);
idt_setGate(16, (int32_t)isr16, 0x08, 0x8E);
idt_setGate(17, (int32_t)isr17, 0x08, 0x8E);
idt_setGate(18, (int32_t)isr18, 0x08, 0x8E);
idt_setGate(19, (int32_t)isr19, 0x08, 0x8E);
idt_setGate(20, (int32_t)isr20, 0x08, 0x8E);
idt_setGate(21, (int32_t)isr21, 0x08, 0x8E);
idt_setGate(22, (int32_t)isr22, 0x08, 0x8E);
idt_setGate(23, (int32_t)isr23, 0x08, 0x8E);
idt_setGate(24, (int32_t)isr24, 0x08, 0x8E);
idt_setGate(25, (int32_t)isr25, 0x08, 0x8E);
idt_setGate(26, (int32_t)isr26, 0x08, 0x8E);
idt_setGate(27, (int32_t)isr27, 0x08, 0x8E);
idt_setGate(28, (int32_t)isr28, 0x08, 0x8E);
idt_setGate(29, (int32_t)isr29, 0x08, 0x8E);
idt_setGate(30, (int32_t)isr30, 0x08, 0x8E);
idt_setGate(31, (int32_t)isr31, 0x08, 0x8E);
idt_setGate(32, (int32_t)irq0, 0x08, 0x8E);
idt_setGate(33, (int32_t)irq1, 0x08, 0x8E);
idt_setGate(34, (int32_t)irq2, 0x08, 0x8E);
idt_setGate(35, (int32_t)irq3, 0x08, 0x8E);
idt_setGate(36, (int32_t)irq4, 0x08, 0x8E);
idt_setGate(37, (int32_t)irq5, 0x08, 0x8E);
idt_setGate(38, (int32_t)irq6, 0x08, 0x8E);
idt_setGate(39, (int32_t)irq7, 0x08, 0x8E);
idt_setGate(40, (int32_t)irq8, 0x08, 0x8E);
idt_setGate(41, (int32_t)irq9, 0x08, 0x8E);
idt_setGate(42, (int32_t)irq10, 0x08, 0x8E);
idt_setGate(43, (int32_t)irq11, 0x08, 0x8E);
idt_setGate(44, (int32_t)irq12, 0x08, 0x8E);
idt_setGate(45, (int32_t)irq13, 0x08, 0x8E);
idt_setGate(46, (int32_t)irq14, 0x08, 0x8E);
idt_setGate(47, (int32_t)irq15, 0x08, 0x8E);
idt_setGate(64, (int32_t)syscall64, 0x08, 0x8E);
idt_ptr.limit = (sizeof(idt_entry_t) * 256) - 1;
idt_ptr.base = (uint32_t)&idt_entries;
asm volatile ("lidt %0"::"m"(idt_ptr):"memory");
}
/* Sets up an IRQ handler for given IRQ. */
void idt_handleIrq(int number, isr_handler_t func) {
if (number < 16 && number >= 0) {
irq_handlers[number] = func;
}
}
/* vim: set ts=4 sw=4 tw=0 noet :*/
|
