#include "IDT.ns.h"
#include <VTManager/SimpleVT.class.h>
#include <DeviceManager/Dev.ns.h>
#include <TaskManager/Task.ns.h>
#include <SyscallManager/Res.ns.h>
using namespace Sys; //For outb
extern "C" void isr0();
extern "C" void isr1();
extern "C" void isr2();
extern "C" void isr3();
extern "C" void isr4();
extern "C" void isr5();
extern "C" void isr6();
extern "C" void isr7();
extern "C" void isr8();
extern "C" void isr9();
extern "C" void isr10();
extern "C" void isr11();
extern "C" void isr12();
extern "C" void isr13();
extern "C" void isr14();
extern "C" void isr15();
extern "C" void isr16();
extern "C" void isr17();
extern "C" void isr18();
extern "C" void isr19();
extern "C" void isr20();
extern "C" void isr21();
extern "C" void isr22();
extern "C" void isr23();
extern "C" void isr24();
extern "C" void isr25();
extern "C" void isr26();
extern "C" void isr27();
extern "C" void isr28();
extern "C" void isr29();
extern "C" void isr30();
extern "C" void isr31();
extern "C" void irq0();
extern "C" void irq1();
extern "C" void irq2();
extern "C" void irq3();
extern "C" void irq4();
extern "C" void irq5();
extern "C" void irq6();
extern "C" void irq7();
extern "C" void irq8();
extern "C" void irq9();
extern "C" void irq10();
extern "C" void irq11();
extern "C" void irq12();
extern "C" void irq13();
extern "C" void irq14();
extern "C" void irq15();
extern "C" void int64(); //Main syscall
extern "C" void int65(); //Syscall to request a task switch
extern "C" void int66(); //Syscall to signal that thread ended
extern "C" void idt_flush(u32int);
extern "C" void interrupt_handler(registers_t regs) {
bool doSwitch = (regs.int_no == 32 or regs.int_no >= 65); //SYSCALLS >= 65 are task-managing-related
if (regs.int_no < 32) {
if ((u32int)Task::currThread() == 0xFFFFFFFF or Task::currThread() == 0)
PANIC_DUMP("Exception cannot be handled.", ®s);
Task::currThread()->handleException(regs, regs.int_no);
} else if (regs.int_no < 48) {
if (regs.int_no >= 40)
outb(0xA0, 0x20);
outb(0x20, 0x20);
Dev::handleIRQ(regs, (regs.int_no - 32));
doSwitch = doSwitch or Task::IRQwakeup(regs.int_no - 32);
}
if (regs.int_no == 64) {
asm volatile("sti"); //Make syscalls preemtible
u32int res = (regs.eax >> 8);
u8int wat = (regs.eax & 0xFF);
if (res == 0xFFFFFF) {
if (regs.eax == 0xFFFFFF01) {
Task::currProcess()->getOutVT()->put(WChar(regs.ebx));
} else if (regs.eax == 0xFFFFFF02) {
Task::currThread()->sleep(regs.ebx);
} else if (regs.eax == 0xFFFFFF03) {
Task::currProcess()->getOutVT()->writeHex(regs.ebx);
}
} else {
regs.eax = Res::call(res, wat, regs.ebx, regs.ecx, regs.edx, regs.edi, regs.esi);
}
//Some syscalls have maybee modified current page directory, set it back to one for current process
Task::currProcess()->getPagedir()->switchTo();
asm volatile("cli");
}
if (regs.int_no == 66) { //This syscall signals to kernel that thread ended.
Task::currentThreadExits(regs.eax); //DO NOT COUNT ON COMMING BACK FROM HERE
}
if (doSwitch) Task::doSwitch(); //DO NOT COUNT ON COMMING BACK FROM HERE EITHER
}
namespace IDT {
idt_entry_t idt_entries[256];
idt_ptr_t idt_ptr;
void setGate(u8int num, u32int base, u16int sel, u8int flags) {
idt_entries[num].base_lo = base & 0xFFFF;
idt_entries[num].base_hi = (base >> 16) & 0xFFFF;
idt_entries[num].sel = sel;
idt_entries[num].flags = flags | 0x60;
idt_entries[num].always0 = 0;
}
void init() {
idt_ptr.limit = (sizeof(idt_entry_t) * 256) - 1;
idt_ptr.base = (u32int)&idt_entries;
CMem::memset((u8int*)&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);
setGate(0, (u32int)isr0, 0x08, 0x8E);
setGate(1, (u32int)isr1, 0x08, 0x8E);
setGate(2, (u32int)isr2, 0x08, 0x8E);
setGate(3, (u32int)isr3, 0x08, 0x8E);
setGate(4, (u32int)isr4, 0x08, 0x8E);
setGate(5, (u32int)isr5, 0x08, 0x8E);
setGate(6, (u32int)isr6, 0x08, 0x8E);
setGate(7, (u32int)isr7, 0x08, 0x8E);
setGate(8, (u32int)isr8, 0x08, 0x8E);
setGate(9, (u32int)isr9, 0x08, 0x8E);
setGate(10, (u32int)isr10, 0x08, 0x8E);
setGate(11, (u32int)isr11, 0x08, 0x8E);
setGate(12, (u32int)isr12, 0x08, 0x8E);
setGate(13, (u32int)isr13, 0x08, 0x8E);
setGate(14, (u32int)isr14, 0x08, 0x8E);
setGate(15, (u32int)isr15, 0x08, 0x8E);
setGate(16, (u32int)isr16, 0x08, 0x8E);
setGate(17, (u32int)isr17, 0x08, 0x8E);
setGate(18, (u32int)isr18, 0x08, 0x8E);
setGate(19, (u32int)isr19, 0x08, 0x8E);
setGate(20, (u32int)isr20, 0x08, 0x8E);
setGate(21, (u32int)isr21, 0x08, 0x8E);
setGate(22, (u32int)isr22, 0x08, 0x8E);
setGate(23, (u32int)isr23, 0x08, 0x8E);
setGate(24, (u32int)isr24, 0x08, 0x8E);
setGate(25, (u32int)isr25, 0x08, 0x8E);
setGate(26, (u32int)isr26, 0x08, 0x8E);
setGate(27, (u32int)isr27, 0x08, 0x8E);
setGate(28, (u32int)isr28, 0x08, 0x8E);
setGate(29, (u32int)isr29, 0x08, 0x8E);
setGate(30, (u32int)isr30, 0x08, 0x8E);
setGate(31, (u32int)isr31, 0x08, 0x8E);
setGate(32, (u32int)irq0, 0x08, 0x8E);
setGate(33, (u32int)irq1, 0x08, 0x8E);
setGate(34, (u32int)irq2, 0x08, 0x8E);
setGate(35, (u32int)irq3, 0x08, 0x8E);
setGate(36, (u32int)irq4, 0x08, 0x8E);
setGate(37, (u32int)irq5, 0x08, 0x8E);
setGate(38, (u32int)irq6, 0x08, 0x8E);
setGate(39, (u32int)irq7, 0x08, 0x8E);
setGate(40, (u32int)irq8, 0x08, 0x8E);
setGate(41, (u32int)irq9, 0x08, 0x8E);
setGate(42, (u32int)irq10, 0x08, 0x8E);
setGate(43, (u32int)irq11, 0x08, 0x8E);
setGate(44, (u32int)irq12, 0x08, 0x8E);
setGate(45, (u32int)irq13, 0x08, 0x8E);
setGate(46, (u32int)irq14, 0x08, 0x8E);
setGate(47, (u32int)irq15, 0x08, 0x8E);
setGate(64, (u32int)int64, 0x08, 0x8E);
setGate(65, (u32int)int65, 0x08, 0x8E);
setGate(66, (u32int)int66, 0x08, 0x8E);
idt_flush((u32int)&idt_ptr);
}
}
