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x86: modify get_desc_base

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This patch makes get_desc_base() receive a struct desc_struct,
and then uses its internal fields to compute the base address.
This is done at both i386 and x86_64, and then it is moved
to common header

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Glauber de Oliveira Costa 2008-01-30 13:31:14 +01:00 committed by Ingo Molnar
parent 26048d75e8
commit cc6978528c
5 changed files with 7 additions and 19 deletions
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2
arch/x86/kernel/tls.c
View File

@ -112,7 +112,7 @@ int do_get_thread_area(struct task_struct *p, int idx,
memset(&info, 0, sizeof(struct user_desc));
info.entry_number = idx;
info.base_addr = get_desc_base((void *)desc);
info.base_addr = get_desc_base((struct desc_struct *)desc);
info.limit = GET_LIMIT(desc);
info.seg_32bit = GET_32BIT(desc);
info.contents = GET_CONTENTS(desc);

2
arch/x86/mm/fault_32.c
View File

@ -115,7 +115,7 @@ static inline unsigned long get_segment_eip(struct pt_regs *regs,
}
/* Decode the code segment base from the descriptor */
base = get_desc_base((unsigned long *)desc);
base = get_desc_base((struct desc_struct *)desc);
if (seg & (1<<2)) {
mutex_unlock(&current->mm->context.lock);

5
include/asm-x86/desc.h
View File

@ -69,6 +69,11 @@ static inline void load_LDT(mm_context_t *pc)
preempt_enable();
}
static inline unsigned long get_desc_base(struct desc_struct *desc)
{
return desc->base0 | ((desc->base1) << 16) | ((desc->base2) << 24);
}
#else
/*
* GET_DESC_BASE reads the descriptor base of the specified segment.

8
include/asm-x86/desc_32.h
View File

@ -168,14 +168,6 @@ static inline void __set_tss_desc(unsigned int cpu, unsigned int entry, const vo
#define set_tss_desc(cpu,addr) __set_tss_desc(cpu, GDT_ENTRY_TSS, addr)
static inline unsigned long get_desc_base(unsigned long *desc)
{
unsigned long base;
base = ((desc[0] >> 16) & 0x0000ffff) |
((desc[1] << 16) & 0x00ff0000) |
(desc[1] & 0xff000000);
return base;
}
#endif /* !__ASSEMBLY__ */
#endif

9
include/asm-x86/desc_64.h
View File

@ -156,15 +156,6 @@ static inline void load_TLS(struct thread_struct *t, unsigned int cpu)
gdt[i] = t->tls_array[i];
}
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