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#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"
#include "ringbuffer.h"
ringbuffer mouse_in;
ringbuffer kb_in;
/** 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)
{
uint32_t *stack;
// process irq
switch(irq)
{
case INTERRUPT_PIT_TIMER:
asm_pit_tick();
break;
case INTERRUPT_KEYBOARD:
ringbuffer_put(&kb_in,x86_inb(0x60));
break;
case INTERRUPT_MOUSE:
ringbuffer_put(&mouse_in,x86_inb(0x60));
break;
case INTERRUPT_SYSCALL:
stack=esp;
task_syscall(stack[11],stack[8],stack[10],stack[9]); //eax,ebx,ecx,edx
break;
case INTERRUPT_APIC_TIMER:
case INTERRUPT_IPI:
esp=scheduler_run(esp,0);
break;
case 255: // default or spurious
kpanic("Spurious/Unknown Interrupt!?");
break;
}
// reschedule to kernel worker on these
if(irq==INTERRUPT_SYSCALL||irq==INTERRUPT_KEYBOARD||irq==INTERRUPT_MOUSE)
{
esp=scheduler_wake_worker(esp);
}
// ack all to LAPIC, except software syscalls
if(irq!=INTERRUPT_SYSCALL)
apic_eoi();
return esp;
}
/**
* init interrupt descriptor table
*/
void interrupts_init(uint16_t sel)
{
klog("initializing Mouse and Kb input buffers");
kb_in=ringbuffer_init(1);// 4096 bytes ringbuffer;
mouse_in=ringbuffer_init(1);// 4096 bytes ringbuffer;
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));
}
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