ptos/amd64: cpu: Add interrupt descriptor table

Signed-off-by: Chloe M. <chloe@mensia.org>
2026-07-11 03:08:00 +00:00
parent cf393eab7b
commit 027074d548
2 changed files with 94 additions and 0 deletions
@@ -16,4 +16,51 @@
 #define IDT_TRAP_GATE   0x8F
 #define IDT_USER_GATE   0xEE

+/*
+ * Represents an interupt gate descriptor
+ *
+ * Refer to section 6.14.1 of the Intel SDM
+ */
+typedef struct {
+    USHORT OffsetLow16;
+    USHORT SegmentSel;
+    UCHAR Ist : 3;
+    UCHAR Zero : 5;
+    UCHAR Type : 4;
+    UCHAR Zero1 : 1;
+    UCHAR Dpl : 2;
+    UCHAR Present : 1;
+    USHORT OffsetMid16;
+    ULONG OffsetHigh32;
+    ULONG Reserved;
+} IDT_GATE;
+
+/*
+ * Refers to the base and limit of the interrupt
+ * descriptor table.
+ *
+ * Refer to section 6.10 of the Intel SDM
+ */
+typedef struct PACKED {
+    USHORT Limit;
+    UQUAD Offset;
+} IDTR;
+
+/*
+ * Set an interrupt descriptor table gate
+ *
+ * @Vector: Interrupt vector to set
+ * @Offset: Offset of interrupt service routine
+ * @Type:   Interrupt gate type
+ * @Ist:    Interrupt stack table index
+ */
+VOID MdIdtSetGate(UCHAR Vector, UPTR Offset, UCHAR Type, UCHAR Ist);
+
+/*
+ * Load the interrupt descriptor table
+ *
+ * XXX: This must be called once per processor
+ */
+VOID MdIdtLoad(VOID);
+
 #endif  /* !_MACHINE_IDT_H_ */