Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
[PATCH] x86_64: Remove unused segments
They used to be used by the reboot code, but not anymore.
Noticed by Jan Beulich
Cc: JBeulich@novell.com
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
authored by Andi Kleen and committed by Linus Torvalds cdc4b9c0 af5b9804
+2
-3
arch/x86_64/kernel/head.S
+2
-3
arch/x86_64/kernel/head.S
···
386
387
ENTRY(cpu_gdt_table)
388
.quad 0x0000000000000000 /* NULL descriptor */
389
-
.quad 0x008f9a000000ffff /* __KERNEL_COMPAT32_CS */
390
.quad 0x00af9a000000ffff /* __KERNEL_CS */
391
.quad 0x00cf92000000ffff /* __KERNEL_DS */
392
.quad 0x00cffa000000ffff /* __USER32_CS */
···
396
.quad 0,0 /* TSS */
397
.quad 0,0 /* LDT */
398
.quad 0,0,0 /* three TLS descriptors */
399
-
.quad 0x00009a000000ffff /* __KERNEL16_CS - 16bit PM for S3 wakeup. */
400
-
/* base must be patched for real base address. */
401
gdt_end:
402
/* asm/segment.h:GDT_ENTRIES must match this */
403
/* This should be a multiple of the cache line size */
···
386
387
ENTRY(cpu_gdt_table)
388
.quad 0x0000000000000000 /* NULL descriptor */
389
+
.quad 0x0 /* unused */
390
.quad 0x00af9a000000ffff /* __KERNEL_CS */
391
.quad 0x00cf92000000ffff /* __KERNEL_DS */
392
.quad 0x00cffa000000ffff /* __USER32_CS */
···
396
.quad 0,0 /* TSS */
397
.quad 0,0 /* LDT */
398
.quad 0,0,0 /* three TLS descriptors */
399
+
.quad 0 /* unused */
400
gdt_end:
401
/* asm/segment.h:GDT_ENTRIES must match this */
402
/* This should be a multiple of the cache line size */
+1
-3
include/asm-x86_64/segment.h
+1
-3
include/asm-x86_64/segment.h
···
19
#define __USER_DS 0x2b /* 5*8+3 */
20
#define __USER_CS 0x33 /* 6*8+3 */
21
#define __USER32_DS __USER_DS
22
-
#define __KERNEL16_CS (GDT_ENTRY_KERNELCS16 * 8)
23
-
#define __KERNEL_COMPAT32_CS 0x8
24
25
#define GDT_ENTRY_TLS 1
26
#define GDT_ENTRY_TSS 8 /* needs two entries */
27
#define GDT_ENTRY_LDT 10 /* needs two entries */
28
#define GDT_ENTRY_TLS_MIN 12
29
#define GDT_ENTRY_TLS_MAX 14
30
-
#define GDT_ENTRY_KERNELCS16 15
31
32
#define GDT_ENTRY_TLS_ENTRIES 3
33
···
19
#define __USER_DS 0x2b /* 5*8+3 */
20
#define __USER_CS 0x33 /* 6*8+3 */
21
#define __USER32_DS __USER_DS
22
23
#define GDT_ENTRY_TLS 1
24
#define GDT_ENTRY_TSS 8 /* needs two entries */
25
#define GDT_ENTRY_LDT 10 /* needs two entries */
26
#define GDT_ENTRY_TLS_MIN 12
27
#define GDT_ENTRY_TLS_MAX 14
28
+
/* 15 free */
29
30
#define GDT_ENTRY_TLS_ENTRIES 3
31