feat(cpu): install IDT with exception and syscall gate handling

2026-08-24 19:45:21 +02:00
1 parent 4843406bf3
commit e5c4139e49
@@ -0,0 +1,75 @@
+#include "isr.h"
+#include "console.h"
+#include "pic.h"
+#include "pit.h"
+#include "keyboard.h"
+#include "sched.h"
+#include "ports.h"
+
+static const char* exceptionNames[32] = {
+    "divide by zero",
+    "debug",
+    "non maskable interrupt",
+    "breakpoint",
+    "overflow",
+    "bound range exceeded",
+    "invalid opcode",
+    "device not available",
+    "double fault",
+    "coprocessor segment overrun",
+    "invalid tss",
+    "segment not present",
+    "stack segment fault",
+    "general protection fault",
+    "page fault",
+    "reserved",
+    "x87 floating point",
+    "alignment check",
+    "machine check",
+    "simd floating point",
+    "virtualization",
+    "control protection",
+    "reserved", "reserved", "reserved", "reserved",
+    "reserved", "reserved", "reserved", "reserved",
+    "hypervisor injection", "vmm communication"
+};
+
+static void panicOnException(Registers* regs)
+{
+    uint64 faultAddress = 0;
+    if (regs->intNo == 14)
+        __asm__ volatile("mov %%cr2, %0" : "=r"(faultAddress));
+
+    kprintf("\n[PANIC] exception %lu (%s)\n", regs->intNo, exceptionNames[regs->intNo]);
+    kprintf("  errCode=%lx rip=%lx cs=%lx rflags=%lx\n",
+            regs->errCode, regs->rip, regs->cs, regs->rflags);
+    if (regs->intNo == 14)
+        kprintf("  cr2=%lx (faulting address)\n", faultAddress);
+    kprintf("  rax=%lx rbx=%lx rcx=%lx rdx=%lx\n", regs->rax, regs->rbx, regs->rcx, regs->rdx);
+    kprintf("  system halted\n");
+
+    for (;;)
+        __asm__ volatile("cli; hlt");
+}
+
+uint64 isrDispatch(Registers* regs)
+{
+    if (regs->intNo < 32)
+        panicOnException(regs);
+
+    if (regs->intNo == 128)
+        return syscallDispatch(regs);
+
+    uint8 irq = (uint8)(regs->intNo - 32);
+    uint64 nextRsp = (uint64)regs;
+
+    if (irq == 0) {
+        pitTick();
+        nextRsp = schedule((uint64)regs);
+    } else if (irq == 1) {
+        keyboardHandler();
+    }
+
+    picSendEoi(irq);
+    return nextRsp;
+}