forked from PoliEcho-holding-org/kern
103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
#include <syscalls/syscalls.h>
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#include <drivers/serial.h>
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#include <cpu/system.h>
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#include <cpu/idt.h>
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#include <cpu/isr.h>
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const char* format = "\x1b[31m[kernel] %s!\n\x1b[0m";
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const char* exceptions[] = {
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"Division By Zero",
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"Debug",
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"Non Maskable Interrupt",
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"Breakpoint",
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"Into Detected Overflow",
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"Out of Bounds",
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"Invalid Opcode",
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"No Coprocessor",
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"Double Fault",
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"Coprocessor Segment Overrun",
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"Bad TSS",
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"Segment Not Present",
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"Stack Fault",
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"General Protection Fault",
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"Page Fault",
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"Unknown Interrupt",
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"Coprocessor Fault",
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"Alignment Check",
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"Machine Check",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved"
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};
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void remapPic() {
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outb(0x20, 0x11);
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outb(0xa0, 0x11);
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outb(0x21, 0x20);
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outb(0xa1, 0x28);
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outb(0x21, 0x04);
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outb(0xa1, 0x02);
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outb(0x21, 0x01);
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outb(0xa1, 0x01);
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outb(0x21, 0x00);
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outb(0xa1, 0x00);
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}
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HandlerPtr irqHandlers[16] = { 0 }; // IRQ 0-15
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void setupIsrs() {
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setupIdt();
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remapPic(); // Remap IRQs 0-15 -> 32-48
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for (int i = 0; i < 48; i++) {
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idtSetGate(i, asm_isrRedirectTable[i], TRAP_GATE_FLAGS);
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}
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// System call
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idtSetGate(0x80, isr128, USR_INT_GATE_FLAGS);
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__asm__ volatile ("sti");
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}
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void registerIrq(uint8_t id, HandlerPtr handler) {
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irqHandlers[id] = handler;
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}
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void sendPicEOI(uint8_t irq) {
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if (irq >= 8) {
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outb(0xA0, 0x20); // PIC2 Command
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}
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outb(0x20, 0x20); // PIC1 Command
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}
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int handleInterrupt(intFrame_t iframe) {
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if (iframe.interrupt < 32) {
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// ISRs 0-31 - Exceptions
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debugf(format, exceptions[iframe.interrupt]);
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panic();
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} else if (iframe.interrupt >= 32 && iframe.interrupt < 48) {
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// ISRs 32-47 - Hardware interrupts
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uint8_t irq = iframe.interrupt - 32;
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if (irqHandlers[irq]) {
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irqHandlers[irq](&iframe);
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sendPicEOI(irq);
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}
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} else if (iframe.interrupt == 128) {
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// ISR 128 - System call
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return syscallHandler(&iframe);
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}
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return 0;
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}
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