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x86: get_desc_base

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This defines the get_desc_base function in asm-x86/desc_64.h to match the
one in desc_32.h.  If these two files ever get merged together, this
function could be the same in both.

Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Roland McGrath 2008-01-30 13:30:44 +01:00 committed by Ingo Molnar
parent cadd516422
commit 859c0a5b9c
1 changed files with 10 additions and 0 deletions
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include/asm-x86/desc_64.h
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@ -215,6 +215,16 @@ static inline void load_LDT(mm_context_t *pc)
extern struct desc_ptr idt_descr;
static inline unsigned long get_desc_base(const void *ptr)
{
const u32 *desc = ptr;
unsigned long base;
base = ((desc[0] >> 16) & 0x0000ffff) |
((desc[1] << 16) & 0x00ff0000) |
(desc[1] & 0xff000000);
return base;
}
#endif /* !__ASSEMBLY__ */
#endif