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x86: don't set up early exception handlers for external interrupts 

All of early setup runs with interrupts disabled, so there is no
need to set up early exception handlers for vectors >= 32

This saves some minor text size.

Signed-off-by: Andi Kleen <ak@suse.de>
Cc: mingo@elte.hu
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Andi Kleen 2008-03-11 02:23:20 +01:00 committed by Ingo Molnar
parent 366932deb3
commit 5524ea320d
3 changed files with 5 additions and 6 deletions
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2
arch/x86/kernel/head64.c
View File

@ -127,7 +127,7 @@ void __init x86_64_start_kernel(char * real_mode_data)
/* Cleanup the over mapped high alias */
cleanup_highmap();
for (i = 0; i < IDT_ENTRIES; i++) {
for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) {
#ifdef CONFIG_EARLY_PRINTK
set_intr_gate(i, &early_idt_handlers[i]);
#else

6
arch/x86/kernel/head_64.S
View File

@ -278,10 +278,8 @@ bad_address:
.globl early_idt_handlers
early_idt_handlers:
early_idt_tramp 0, 63
early_idt_tramp 64, 127
early_idt_tramp 128, 191
early_idt_tramp 192, 255
.set maxe, NUM_EXCEPTION_VECTORS-1
early_idt_tramp 0, maxe
#endif
ENTRY(early_idt_handler)

3
include/asm-x86/segment.h
View File

@ -191,13 +191,14 @@
#define SEGMENT_TI_MASK 0x4
#define IDT_ENTRIES 256
#define NUM_EXCEPTION_VECTORS 32
#define GDT_SIZE (GDT_ENTRIES * 8)
#define GDT_ENTRY_TLS_ENTRIES 3
#define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
extern const char early_idt_handlers[IDT_ENTRIES][10];
extern const char early_idt_handlers[NUM_EXCEPTION_VECTORS][10];
#endif
#endif