[PATCH 16/19] modify get_desc_base

[Glauber de Oliveira Costa]

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 <[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(-)

Index: linux-2.6-x86/arch/x86/kernel/tls.c
===================================================================
--- linux-2.6-x86.orig/arch/x86/kernel/tls.c
+++ linux-2.6-x86/arch/x86/kernel/tls.c
@@ -112,7 +112,7 @@ int do_get_thread_area(struct task_struc
 
        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);
Index: linux-2.6-x86/arch/x86/mm/fault_32.c
===================================================================
--- linux-2.6-x86.orig/arch/x86/mm/fault_32.c
+++ linux-2.6-x86/arch/x86/mm/fault_32.c
@@ -115,7 +115,7 @@ static inline unsigned long get_segment_
        }
 
        /* 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);
Index: linux-2.6-x86/include/asm-x86/desc.h
===================================================================
--- linux-2.6-x86.orig/include/asm-x86/desc.h
+++ linux-2.6-x86/include/asm-x86/desc.h
@@ -69,6 +69,11 @@ static inline void load_LDT(mm_context_t
        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.
Index: linux-2.6-x86/include/asm-x86/desc_32.h
===================================================================
--- linux-2.6-x86.orig/include/asm-x86/desc_32.h
+++ linux-2.6-x86/include/asm-x86/desc_32.h
@@ -168,14 +168,6 @@ static inline void __set_tss_desc(unsign
 
 #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
Index: linux-2.6-x86/include/asm-x86/desc_64.h
===================================================================
--- linux-2.6-x86.orig/include/asm-x86/desc_64.h
+++ linux-2.6-x86/include/asm-x86/desc_64.h
@@ -156,15 +156,6 @@ static inline void load_TLS(struct threa
                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
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