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#include "screen.h"
#include "common.h"
#include "descriptortables.h"
#include "isr.h"
#include "process.h"
extern void flushGdt(uint32);
extern void flushIdt(uint32);
extern void flushTss();
static void initializeGdt();
static void initializeIdt();
static void setGdtEntry(int32 num, uint32 base, uint32 limit, uint8 access, uint8 gran);
static void setIdtEntry(uint8 num, uint32 base, uint16 sel, uint8 flags);
GdtEntry gGdtEntries[6];
GdtPointer gGdtPointer;
IdtEntry gIdtEntries[256];
IdtPointer gIdtPointer;
Tss gTss;
extern IsrFunction gInterruptHandlers[];
static void handleDoubleFault(Registers *regs);
static void handleGeneralProtectionFault(Registers *regs);
void initializeDescriptorTables() {
initializeGdt();
initializeIdt();
memset((uint8*)&gInterruptHandlers, 0, sizeof(IsrFunction)*256);
registerInterruptHandler(8, handleDoubleFault);
registerInterruptHandler(13, handleGeneralProtectionFault);
}
static void initializeGdt() {
gGdtPointer.limit = (sizeof(GdtEntry) * 6) - 1;
gGdtPointer.base = (uint32)&gGdtEntries;
setGdtEntry(0, 0, 0, 0, 0); // 0x00 Null segment
setGdtEntry(1, 0, 0xFFFFFFFF, 0x9A, 0xCF); // 0x08 Code segment
setGdtEntry(2, 0, 0xFFFFFFFF, 0x92, 0xCF); // 0x10 Data segment
setGdtEntry(3, 0, 0xFFFFFFFF, 0xFA, 0xCF); // 0x18 User mode code segment
setGdtEntry(4, 0, 0xFFFFFFFF, 0xF2, 0xCF); // 0x20 User mode data segment
//TSS
memset((uint8*)&gTss, 0, sizeof(gTss));
gTss.debug_flag = 0x00;
gTss.io_map = 0x00;
gTss.esp0 = 0;//0x1FFF0;
gTss.ss0 = 0x10;//0x18;
gTss.cs = 0x0B; //from ring 3 - 0x08 | 3 = 0x0B
gTss.ss = gTss.ds = gTss.es = gTss.fs = gTss.gs = 0x13; //from ring 3 = 0x10 | 3 = 0x13
uint32 tss_base = (uint32) &gTss;
uint32 tss_limit = tss_base + sizeof(gTss);
setGdtEntry(5, tss_base, tss_limit, 0xE9, 0x00);
flushGdt((uint32)&gGdtPointer);
flushTss();
}
// Set the value of one GDT entry.
static void setGdtEntry(int32 num, uint32 base, uint32 limit, uint8 access, uint8 gran) {
gGdtEntries[num].base_low = (base & 0xFFFF);
gGdtEntries[num].base_middle = (base >> 16) & 0xFF;
gGdtEntries[num].base_high = (base >> 24) & 0xFF;
gGdtEntries[num].limit_low = (limit & 0xFFFF);
gGdtEntries[num].granularity = (limit >> 16) & 0x0F;
gGdtEntries[num].granularity |= gran & 0xF0;
gGdtEntries[num].access = access;
}
void irqTimer();
static void initializeIdt() {
gIdtPointer.limit = sizeof(IdtEntry) * 256 -1;
gIdtPointer.base = (uint32)&gIdtEntries;
memset((uint8*)&gIdtEntries, 0, sizeof(IdtEntry)*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);
setIdtEntry( 0, (uint32)isr0 , 0x08, 0x8E);
setIdtEntry( 1, (uint32)isr1 , 0x08, 0x8E);
setIdtEntry( 2, (uint32)isr2 , 0x08, 0x8E);
setIdtEntry( 3, (uint32)isr3 , 0x08, 0x8E);
setIdtEntry( 4, (uint32)isr4 , 0x08, 0x8E);
setIdtEntry( 5, (uint32)isr5 , 0x08, 0x8E);
setIdtEntry( 6, (uint32)isr6 , 0x08, 0x8E);
setIdtEntry( 7, (uint32)isr7 , 0x08, 0x8E);
setIdtEntry( 8, (uint32)isr8 , 0x08, 0x8E);
setIdtEntry( 9, (uint32)isr9 , 0x08, 0x8E);
setIdtEntry(10, (uint32)isr10, 0x08, 0x8E);
setIdtEntry(11, (uint32)isr11, 0x08, 0x8E);
setIdtEntry(12, (uint32)isr12, 0x08, 0x8E);
setIdtEntry(13, (uint32)isr13, 0x08, 0x8E);
setIdtEntry(14, (uint32)isr14, 0x08, 0x8E);
setIdtEntry(15, (uint32)isr15, 0x08, 0x8E);
setIdtEntry(16, (uint32)isr16, 0x08, 0x8E);
setIdtEntry(17, (uint32)isr17, 0x08, 0x8E);
setIdtEntry(18, (uint32)isr18, 0x08, 0x8E);
setIdtEntry(19, (uint32)isr19, 0x08, 0x8E);
setIdtEntry(20, (uint32)isr20, 0x08, 0x8E);
setIdtEntry(21, (uint32)isr21, 0x08, 0x8E);
setIdtEntry(22, (uint32)isr22, 0x08, 0x8E);
setIdtEntry(23, (uint32)isr23, 0x08, 0x8E);
setIdtEntry(24, (uint32)isr24, 0x08, 0x8E);
setIdtEntry(25, (uint32)isr25, 0x08, 0x8E);
setIdtEntry(26, (uint32)isr26, 0x08, 0x8E);
setIdtEntry(27, (uint32)isr27, 0x08, 0x8E);
setIdtEntry(28, (uint32)isr28, 0x08, 0x8E);
setIdtEntry(29, (uint32)isr29, 0x08, 0x8E);
setIdtEntry(30, (uint32)isr30, 0x08, 0x8E);
setIdtEntry(31, (uint32)isr31, 0x08, 0x8E);
setIdtEntry(32, (uint32)irqTimer, 0x08, 0x8E);
setIdtEntry(33, (uint32)irq1, 0x08, 0x8E);
setIdtEntry(34, (uint32)irq2, 0x08, 0x8E);
setIdtEntry(35, (uint32)irq3, 0x08, 0x8E);
setIdtEntry(36, (uint32)irq4, 0x08, 0x8E);
setIdtEntry(37, (uint32)irq5, 0x08, 0x8E);
setIdtEntry(38, (uint32)irq6, 0x08, 0x8E);
setIdtEntry(39, (uint32)irq7, 0x08, 0x8E);
setIdtEntry(40, (uint32)irq8, 0x08, 0x8E);
setIdtEntry(41, (uint32)irq9, 0x08, 0x8E);
setIdtEntry(42, (uint32)irq10, 0x08, 0x8E);
setIdtEntry(43, (uint32)irq11, 0x08, 0x8E);
setIdtEntry(44, (uint32)irq12, 0x08, 0x8E);
setIdtEntry(45, (uint32)irq13, 0x08, 0x8E);
setIdtEntry(46, (uint32)irq14, 0x08, 0x8E);
setIdtEntry(47, (uint32)irq15, 0x08, 0x8E);
setIdtEntry(128, (uint32)isr128, 0x08, 0x8E);
flushIdt((uint32)&gIdtPointer);
}
static void setIdtEntry(uint8 num, uint32 base, uint16 sel, uint8 flags) {
gIdtEntries[num].base_lo = base & 0xFFFF;
gIdtEntries[num].base_hi = (base >> 16) & 0xFFFF;
gIdtEntries[num].sel = sel;
gIdtEntries[num].always0 = 0;
gIdtEntries[num].flags = flags | 0x60;
}
static void handleDoubleFault(Registers *regs) {
printkf("Double fault!!! Error code:%d\n", regs->errorCode);
PANIC("Double fault!!!");
}
static void handleGeneralProtectionFault(Registers *regs) {
printkf("General protection fault!!! Error code:%d - IP:%x\n", regs->errorCode, regs->eip);
Thread* faultingThread = getCurrentThread();
if (NULL != faultingThread) {
Thread* mainThread = getMainKernelThread();
if (mainThread == faultingThread) {
PANIC("General protection fault in Kernel main thread!!!");
}
else {
printkf("Faulting thread is %d\n", faultingThread->threadId);
if (faultingThread->userMode) {
printkf("Destroying process %d\n", faultingThread->owner->pid);
destroyProcess(faultingThread->owner);
}
else {
printkf("Destroying kernel thread %d\n", faultingThread->threadId);
destroyThread(faultingThread);
}
waitForSchedule();
}
}
else {
PANIC("General protection fault!!!");
}
}
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