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
|
#include "kernel.h"
#include "log.h"
#include "asm_int.h"
#include "asm_pit.h"
#include "driver/mouse.h"
#include "driver/keyboard.h"
#include "interrupts.h"
#include "scheduler.h"
#include "asm_x86.h"
#include "smp.h"
#include "apic.h"
/** The size of our interrupts table */
#define INT_MAX 256 // 0-255
/** The interrupt descriptor table */
static struct int_desc
{
uint16_t addrLo;
uint16_t sel;
uint8_t zeros;
uint8_t flags;
uint16_t addrHi;
} idt[INT_MAX];
/** The interrupt descriptor table descriptor */
static struct idt_desc
{
uint16_t size;
uint16_t baseLo;
uint16_t baseHi;
} idtd;
/** Sets a handler for a specific interrupt */
static void int_install_ir(int irq, uint16_t flags, uint16_t sel, void *addr)
{
uint64_t base=(uint32_t)&(*(uint32_t*)addr);
idt[irq].addrLo = base & 0xffff;
idt[irq].addrHi = (base >> 16) & 0xffff;
idt[irq].zeros=0;
idt[irq].flags=flags;
idt[irq].sel=sel;
}
/*
* Interrupt dispatcher
*
* Remeber that we are inside an interrupt here!
*
*/
uint32_t interrupt_handler(uint32_t esp, uint32_t irq)
{
if(irq==INTERRUPT_PIT_TIMER)asm_pit_tick();
// mouse and kb
if(irq==INTERRUPT_KEYBOARD || irq==INTERRUPT_MOUSE){
uint32_t in=x86_inb(0x60);
if(irq==INTERRUPT_KEYBOARD){
keyboard_handle(in); // do this in separate thread via syscalls?
task_wake_all();
}
// TODO: mouse
// test ipi
apic_ipi(2,0x81); // force cpu16 to autoschedule? just test
//klog("0x60 in %d",in);
}
// 0x80 - a syscall is coming in
if(irq==INTERRUPT_SYSCALL){
uint32_t *stack=esp;
uint32_t eax=stack[11];
uint32_t ebx=stack[8];
uint32_t ecx=stack[10];
uint32_t edx=stack[9];
// klog("syscall: %d (ebx=0x%08X,ecx=0x%08X,edx=0x%08X)",eax,ebx,ecx,edx);
task_syscall(eax,ebx,ecx,edx);
esp=scheduler_run(esp,2); // force scheduling of pid=2 (kernel worker)
}
// schedules on APIC timer 0x8C and IPI 0x81
if(irq==INTERRUPT_APIC_TIMER || irq==INTERRUPT_IPI)esp=scheduler_run(esp,-1); // autoschedule
if(irq!=INTERRUPT_SYSCALL)apic_eoi(); // ack all except software syscalls
if(irq==255)kpanic("Spurious/Unknown Interrupt!?"); // default and spurious
return esp;
}
/**
* init interrupt descriptor table
*/
void interrupts_init(uint16_t sel)
{
klog("initializing. IDT: 0x%08x, IDTD: 0x%08X",&idt,&idtd);
// Default interrupt handling
for(int i=0; i<INT_MAX; i++)
{
int_install_ir(i, 0b10001110, sel,&int255);
}
// Exceptions
int_install_ir(0, 0b10001110, 0x08,&exc0);
int_install_ir(1, 0b10001110, 0x08,&exc1);
int_install_ir(2, 0b10001110, 0x08,&exc2);
int_install_ir(3, 0b10001110, 0x08,&exc3);
int_install_ir(4, 0b10001110, 0x08,&exc4);
int_install_ir(5, 0b10001110, 0x08,&exc5);
int_install_ir(6, 0b10001110, 0x08,&exc6);
int_install_ir(7, 0b10001110, 0x08,&exc7);
int_install_ir(8, 0b10001110, 0x08,&exc8);
int_install_ir(9, 0b10001110, 0x08,&exc9);
int_install_ir(10, 0b10001110, 0x08,&exc10);
int_install_ir(11, 0b10001110, 0x08,&exc11);
int_install_ir(12, 0b10001110, 0x08,&exc12);
int_install_ir(13, 0b10001110, 0x08,&exc13);
int_install_ir(14, 0b10001110, 0x08,&exc14);
int_install_ir(15, 0b10001110, 0x08,&exc15);
int_install_ir(16, 0b10001110, 0x08,&exc16);
int_install_ir(17, 0b10001110, 0x08,&exc17);
int_install_ir(18, 0b10001110, 0x08,&exc18);
// PIT (IOAPIC)
int_install_ir(0x90, 0b10001110, 0x08,&int144);
// Keyboard (IOAPIC)
int_install_ir(0x91, 0b10001110, 0x08,&int145);
// Mouse (IOAPIC)
int_install_ir(0x92, 0b10001110, 0x08,&int146);
// APIC Timer (LAPIC)
int_install_ir(0x8C, 0b10001110, 0x08,&int140);
// System Calls (User Software / Ring 3)
int_install_ir(0x80, 0b11101110, 0x08,&int128);
// Inter Processesor Interrupts (Kernel Software)
int_install_ir(0x81, 0b10001110, 0x08,&int129);
}
/** Installs the interrupt table */
void interrupts_install()
{
idtd.size=sizeof(struct int_desc)*INT_MAX;
uint32_t addr=(uint32_t)&idt[0];
idtd.baseHi=addr>>16;
idtd.baseLo=0xffff&addr;
__asm__("lidt %0"::"m" (idtd));
}
|
