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x86: unify and correct the GDT_ENTRY() macro

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Merge the GDT_ENTRY() macro between arch/x86/boot/pm.c and
arch/x86/kernel/acpi/sleep.c and put the new one in
<asm-x86/segment.h>.

While we're at it, correct the bitmasks for the limit and flags.  The
new version relies on using ULL constants in order to cause type
promotion rather than explicit casts; this avoids having to include
<linux/types.h> in <asm-x86/segments.h>.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin 2008-07-17 11:29:24 -07:00
parent 5b664cb235
commit 4fdf08b5bf
3 changed files with 10 additions and 15 deletions
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6
arch/x86/boot/pm.c
View file

@ -98,12 +98,6 @@ static void reset_coprocessor(void)
/*
* Set up the GDT
*/
#define GDT_ENTRY(flags, base, limit) \
(((u64)(base & 0xff000000) << 32) | \
((u64)flags << 40) | \
((u64)(limit & 0x00ff0000) << 32) | \
((u64)(base & 0x00ffffff) << 16) | \
((u64)(limit & 0x0000ffff)))
struct gdt_ptr {
u16 len;

10
arch/x86/kernel/acpi/sleep.c
View file

@ -9,6 +9,7 @@
#include <linux/bootmem.h>
#include <linux/dmi.h>
#include <linux/cpumask.h>
#include <asm/segment.h>
#include "realmode/wakeup.h"
#include "sleep.h"
@ -23,15 +24,6 @@ static unsigned long acpi_realmode;
static char temp_stack[10240];
#endif
/* XXX: this macro should move to asm-x86/segment.h and be shared with the
boot code... */
#define GDT_ENTRY(flags, base, limit) \
(((u64)(base & 0xff000000) << 32) | \
((u64)flags << 40) | \
((u64)(limit & 0x00ff0000) << 32) | \
((u64)(base & 0x00ffffff) << 16) | \
((u64)(limit & 0x0000ffff)))
/**
* acpi_save_state_mem - save kernel state
*

9
include/asm-x86/segment.h
View file

@ -1,6 +1,15 @@
#ifndef _ASM_X86_SEGMENT_H_
#define _ASM_X86_SEGMENT_H_
/* Constructor for a conventional segment GDT (or LDT) entry */
/* This is a macro so it can be used in initializers */
#define GDT_ENTRY(flags, base, limit) \
((((base) & 0xff000000ULL) << (56-24)) | \
(((flags) & 0x0000f0ffULL) << 40) | \
(((limit) & 0x000f0000ULL) << (48-16)) | \
(((base) & 0x00ffffffULL) << 16) | \
(((limit) & 0x0000ffffULL)))
/* Simple and small GDT entries for booting only */
#define GDT_ENTRY_BOOT_CS 2