Virtual memory & paging

[lunaix-os.git] / lunaix-os / kernel / asm / x86 / idt.c

diff --git a/lunaix-os/kernel/asm/x86/idt.c b/lunaix-os/kernel/asm/x86/idt.c
new file mode 100644 (file)
index 0000000..9f2bd06
--- /dev/null
+++ b/lunaix-os/kernel/asm/x86/idt.c
@@ -0,0 +1,22 @@
+#include <arch/x86/idt.h>
+#include <arch/x86/interrupts.h>
+#include <arch/x86/types.h>
+#include <stdint.h>
+
+#define IDT_ENTRY 32
+
+uint64_t _idt[IDT_ENTRY];
+uint16_t _idt_limit = sizeof(_idt) - 1;
+
+void _set_idt_entry(uint32_t vector, uint16_t seg_selector, void (*isr)(), uint8_t dpl) {
+    uintptr_t offset = (uintptr_t)isr;
+    _idt[vector] = (offset & 0xffff0000) | IDT_ATTR(dpl);
+    _idt[vector] <<= 32;
+    _idt[vector] |= (seg_selector << 16) | (offset & 0x0000ffff);
+}
+
+
+void
+_init_idt() {
+    _set_idt_entry(FAULT_DIVISION_ERROR, 0x08, _asm_isr0, 0);
+}
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