Add constants for entries in the IDT and use those instead of magic

numbers.

1 files changed, 24 insertions, 0 deletions

diff --git a/sys/i386/include/segments.h b/sys/i386/include/segments.h
index 95117da..1877b07 100644
--- a/sys/i386/include/segments.h
+++ b/sys/i386/include/segments.h
@@ -181,6 +181,30 @@ struct region_descriptor {
 #define	NRSVIDT	32		/* reserved entries for cpu exceptions */
 
 /*
+ * Entries in the Interrupt Descriptor Table (IDT)
+ */
+#define	IDT_DE		0	/* #DE: Divide Error */
+#define	IDT_DB		1	/* #DB: Debug */
+#define	IDT_NMI		2	/* Nonmaskable External Interrupt */
+#define	IDT_BP		3	/* #BP: Breakpoint */
+#define	IDT_OF		4	/* #OF: Overflow */
+#define	IDT_BR		5	/* #BR: Bound Range Exceeded */
+#define	IDT_UD		6	/* #UD: Undefined/Invalid Opcode */
+#define	IDT_NM		7	/* #NM: No Math Coprocessor */
+#define	IDT_DF		8	/* #DF: Double Fault */
+#define	IDT_FPUGP	9	/* Coprocessor Segment Overrun */
+#define	IDT_TS		10	/* #TS: Invalid TSS */
+#define	IDT_NP		11	/* #NP: Segment Not Present */
+#define	IDT_SS		12	/* #SS: Stack Segment Fault */
+#define	IDT_GP		13	/* #GP: General Protection Fault */
+#define	IDT_PF		14	/* #PF: Page Fault */
+#define	IDT_MF		16	/* #MF: FPU Floating-Point Error */
+#define	IDT_AC		17	/* #AC: Alignment Check */
+#define	IDT_MC		18	/* #MC: Machine Check */
+#define	IDT_XF		19	/* #XF: SIMD Floating-Point Exception */
+#define	IDT_SYSCALL	0x80	/* System Call Interrupt Vector */
+
+/*
  * Entries in the Global Descriptor Table (GDT)
  */
 #define	GNULL_SEL	0	/* Null Descriptor */