diff options
Diffstat (limited to 'kernel.soso/descriptortables.c')
| -rw-r--r-- | kernel.soso/descriptortables.c | 198 |
1 files changed, 0 insertions, 198 deletions
diff --git a/kernel.soso/descriptortables.c b/kernel.soso/descriptortables.c deleted file mode 100644 index b6aab367..00000000 --- a/kernel.soso/descriptortables.c +++ /dev/null @@ -1,198 +0,0 @@ -#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!!!"); - } -} |