Implement interrupt descriptor table

Signed-off-by: Carlos Maiolino <[email protected]>

1 files changed, 42 insertions, 0 deletions

diff --git a/src/idt/idt.c b/src/idt/idt.c
new file mode 100644
index 0000000..d7a6743
--- /dev/null
+++ b/src/idt/idt.c
@@ -0,0 +1,42 @@
+#include <stdint.h>
+#include <toxic/config.h>
+#include <toxic/string.h>
+#include <toxic/vga.h>
+#include <toxic/idt.h>
+
+struct int_descriptor int_table[TOTAL_INTERRUPTS];
+struct int_reg_descriptor idtr_descriptor;
+
+extern void idt_load(struct int_reg_descriptor *desc);
+
+static void
+idt_zero()
+{
+	vprintl("Illegal operation: Divide by zero\n");
+}
+
+static void
+idt_set(int int_num, void *addr)
+{
+	struct int_descriptor *desc = &int_table[int_num];
+
+	desc->offset_low = (uint32_t) addr & 0x0000FFFF;
+	desc->selector = KERNEL_CODE_SELECTOR;
+	desc->reserved = 0x00;
+	desc->type_attr = TOXIC_INT_ATTR;
+	desc->offset_high = (uint32_t) addr >> 16;
+}
+
+void
+interrupts_init(void)
+{
+	memset(int_table, 0, sizeof(int_table));
+
+	idtr_descriptor.limit = sizeof(int_table) - 1;
+	idtr_descriptor.base = (uint32_t) int_table;
+
+	idt_set(0, idt_zero);
+
+	idt_load(&idtr_descriptor);
+}
+