x86/idtentry: Add a macro to create IDT entry stubs

The symbols irq_entries_start and spurious_entries_start are tables of
IDT entry stubs that are subsequently used to populate the interrupt
descriptor table.

The code for both stubs tables is identical. Wrap it in a macro.

Signed-off-by: Ricardo Neri <[email protected]>
---
Changes since v1:
 * None

Author: ricardon

arch/x86/include/asm/idtentry.h

@@ -547,36 +547,43 @@ static inline void fred_install_sysvec(unsigned int vector, const idtentry_t fun
  * point is to mask off the bits above bit 7 because the push is sign
  * extending.
  */
+.macro __idtentry_stubs name, vector_nr_start, vector_nr, isr
 	.align IDT_ALIGN
-SYM_CODE_START(irq_entries_start)
-    vector=FIRST_EXTERNAL_VECTOR
-    .rept NR_EXTERNAL_VECTORS
+SYM_CODE_START(\name)
+    vector=\vector_nr_start
+    .rept (\vector_nr)
 	UNWIND_HINT_IRET_REGS
 0 :
 	ENDBR
 	.byte	0x6a, vector
-	jmp	asm_common_interrupt
+	jmp	asm_\isr
 	/* Ensure that the above is IDT_ALIGN bytes max */
 	.fill 0b + IDT_ALIGN - ., 1, 0xcc
 	vector = vector+1
+
     .endr
-SYM_CODE_END(irq_entries_start)
+
+SYM_CODE_END(\name)
+.endm
+
+/**
+ * DEFINE_IDTENTRY_STUBS - DECLARE_IDTENTRY_DF - Define a block of IDT entries
+ * @name:		Name of the entry point
+ * @vector_nr_start:	First vector number
+ * @vector_nr:		Number of vectors to emit
+ * @isr:		Name of the C handler called from ASM entry point
+ *
+ * Emit a block of @vector_nr IDT entry stubs packed into IDT_ALIGN bytes.
+ */
+#define DEFINE_IDTENTRY_STUBS(name, vector_nr_start, vector_nr, isr)	\
+	__idtentry_stubs name, (vector_nr_start), (vector_nr), isr
+
+DEFINE_IDTENTRY_STUBS(irq_entries_start, FIRST_EXTERNAL_VECTOR,
+		      NR_EXTERNAL_VECTORS, common_interrupt)
 
 #ifdef CONFIG_X86_LOCAL_APIC
-	.align IDT_ALIGN
-SYM_CODE_START(spurious_entries_start)
-    vector=FIRST_SYSTEM_VECTOR
-    .rept NR_SYSTEM_VECTORS
-	UNWIND_HINT_IRET_REGS
-0 :
-	ENDBR
-	.byte	0x6a, vector
-	jmp	asm_spurious_interrupt
-	/* Ensure that the above is IDT_ALIGN bytes max */
-	.fill 0b + IDT_ALIGN - ., 1, 0xcc
-	vector = vector+1
-    .endr
-SYM_CODE_END(spurious_entries_start)
+DEFINE_IDTENTRY_STUBS(spurious_entries_start, FIRST_SYSTEM_VECTOR,
+		      NR_SYSTEM_VECTORS, spurious_interrupt)
 #endif
 
 #endif /* __ASSEMBLY__ */