Implement interrupt descriptor table

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

1 files changed, 27 insertions, 0 deletions

diff --git a/src/include/toxic/idt.h b/src/include/toxic/idt.h
new file mode 100644
index 0000000..f54f7f7
--- /dev/null
+++ b/src/include/toxic/idt.h
@@ -0,0 +1,27 @@
+#ifndef IDT_H
+#define IDT_H
+#include <stdint.h>
+
+/* ATTR byte field values */
+#define INT_GATE_32	0x0E
+#define TRAP_GATE_32	0x0F
+#define DPL_RING3	0x60
+#define PRESENT_BIT	(1 << 7)
+
+#define TOXIC_INT_ATTR (PRESENT_BIT | DPL_RING3 | INT_GATE_32)
+
+struct int_descriptor {
+	uint16_t	offset_low;	/* bits 0..15 */
+	uint16_t	selector;	/* Code segment selector */
+	uint8_t		reserved;	/* Unused, must be 0 */
+	uint8_t		type_attr;	/* gate type, DPL, presence */
+	uint16_t	offset_high;	/* bits 16..31 */
+} __attribute__((packed));
+
+struct int_reg_descriptor {
+	uint16_t	limit;	/* Int descriptor table size (bytes) -1 */
+	uint32_t	base;	/* Table starting offset (linear address) */
+} __attribute__((packed));
+
+void interrupts_init(void);
+#endif /* IDT_H */