[PATCH 16/19] modify get_desc_base

This patch makes get_desc_base() receive a struct desc_struct,
and then uses its internal fields to compute the base address.

Signed-off-by: Glauber de Oliveira Costa <[email protected]>
---
 arch/x86/kernel/tls.c  |    2 +-
 arch/x86/mm/fault_32.c |    2 +-
 include/asm-x86/desc.h |    8 ++------
 3 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/tls.c b/arch/x86/kernel/tls.c
index 74d2b65..98f428b 100644
--- a/arch/x86/kernel/tls.c
+++ b/arch/x86/kernel/tls.c
@@ -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);
diff --git a/arch/x86/mm/fault_32.c b/arch/x86/mm/fault_32.c
index 6056c6d..ef5ab2b 100644
--- a/arch/x86/mm/fault_32.c
+++ b/arch/x86/mm/fault_32.c
@@ -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);
diff --git a/include/asm-x86/desc.h b/include/asm-x86/desc.h
index 926d6f8..3480cb1 100644
--- a/include/asm-x86/desc.h
+++ b/include/asm-x86/desc.h
@@ -55,13 +55,9 @@ static inline void load_LDT(mm_context_t *pc)
 	preempt_enable();
 }
 
-static inline unsigned long get_desc_base(unsigned long *desc)
+static inline unsigned long get_desc_base(struct desc_struct *desc)
 {
-	unsigned long base;
-	base = ((desc[0] >> 16)  & 0x0000ffff) |
-		((desc[1] << 16) & 0x00ff0000) |
-		(desc[1] & 0xff000000);
-	return base;
+	return desc->base0 | ((desc->base1) << 16) | ((desc->base2) << 24);
 }
 
 #else
-- 
1.5.0.6

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---

• Follow-Ups:
  • [PATCH 17/19] unify paravirt pieces of descriptor handling
    • From: Glauber de Oliveira Costa <[email protected]>

• References:
  • [PATCH 0/19] desc_struct integration
    • From: Glauber de Oliveira Costa <[email protected]>
  • [PATCH 0/19] desc_struct integration
    • From: Glauber de Oliveira Costa <[email protected]>
  • [PATCH 01/19] unify desc_struct
    • From: Glauber de Oliveira Costa <[email protected]>
  • [PATCH 02/19] unify struct desc_ptr
    • From: Glauber de Oliveira Costa <[email protected]>
  • [PATCH 03/19] change gdt acessor macro name
    • From: Glauber de Oliveira Costa <[email protected]>
  • [PATCH 04/19] removed unused variable
    • From: Glauber de Oliveira Costa <[email protected]>
  • [PATCH 05/19] introduce gate_desc type.
    • From: Glauber de Oliveira Costa <[email protected]>
  • [PATCH 06/19] change write_idt_entry signature
    • From: Glauber de Oliveira Costa <[email protected]>
  • [PATCH 07/19] introduce ldt_desc type.
    • From: Glauber de Oliveira Costa <[email protected]>
  • [PATCH 08/19] modify write_ldt function
    • From: Glauber de Oliveira Costa <[email protected]>
  • [PATCH 09/19] introduce fill_ldt
    • From: Glauber de Oliveira Costa <[email protected]>
  • [PATCH 10/19] provide tss_desc
    • From: Glauber de Oliveira Costa <[email protected]>
  • [PATCH 11/19] change write_gdt_entry signature.
    • From: Glauber de Oliveira Costa <[email protected]>
  • [PATCH 12/19] change write_ldt_entry signature
    • From: Glauber de Oliveira Costa <[email protected]>
  • [PATCH 13/19] move constants to desc_defs.h
    • From: Glauber de Oliveira Costa <[email protected]>
  • [PATCH 14/19] unify non-paravirt parts of desc.h
    • From: Glauber de Oliveira Costa <[email protected]>
  • [PATCH 15/19] use the same data type for tls_array.
    • From: Glauber de Oliveira Costa <[email protected]>

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