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authorJeremy Fitzhardinge <jeremy@goop.org>2006-12-07 02:14:01 +0100
committerAndi Kleen <andi@basil.nowhere.org>2006-12-07 02:14:01 +0100
commite5e3a0428968dcc1f9318ce1c941a918e99f8b84 (patch)
treefa2dcb620a22ba197371ac08944628993958ba1e
parente2764a1e306c986053a52b33748c33463cf888de (diff)
downloadop-kernel-dev-e5e3a0428968dcc1f9318ce1c941a918e99f8b84.zip
op-kernel-dev-e5e3a0428968dcc1f9318ce1c941a918e99f8b84.tar.gz
[PATCH] i386: remove default_ldt, and simplify ldt-setting.
This patch removes the default_ldt[] array, as it has been unused since iBCS stopped being supported. This means it is now possible to actually set an empty LDT segment. In order to deal with this, the set_ldt_desc/load_LDT pair has been replaced with a single set_ldt() operation which is responsible for both setting up the LDT descriptor in the GDT, and reloading the LDT register. If there are no LDT entries, the LDT register is loaded with a NULL descriptor. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Andi Kleen <ak@suse.de> Acked-by: Zachary Amsden <zach@vmware.com> Signed-off-by: Andrew Morton <akpm@osdl.org>
-rw-r--r--arch/i386/kernel/ldt.c4
-rw-r--r--arch/i386/kernel/traps.c3
-rw-r--r--include/asm-i386/desc.h50
-rw-r--r--include/asm-i386/mmu_context.h4
4 files changed, 22 insertions, 39 deletions
diff --git a/arch/i386/kernel/ldt.c b/arch/i386/kernel/ldt.c
index 445211e..b410e5f 100644
--- a/arch/i386/kernel/ldt.c
+++ b/arch/i386/kernel/ldt.c
@@ -160,16 +160,14 @@ static int read_default_ldt(void __user * ptr, unsigned long bytecount)
{
int err;
unsigned long size;
- void *address;
err = 0;
- address = &default_ldt[0];
size = 5*sizeof(struct desc_struct);
if (size > bytecount)
size = bytecount;
err = size;
- if (copy_to_user(ptr, address, size))
+ if (clear_user(ptr, size))
err = -EFAULT;
return err;
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index 48ebfab6..56655ea 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -61,9 +61,6 @@ int panic_on_unrecovered_nmi;
asmlinkage int system_call(void);
-struct desc_struct default_ldt[] = { { 0, 0 }, { 0, 0 }, { 0, 0 },
- { 0, 0 }, { 0, 0 } };
-
/* Do we ignore FPU interrupts ? */
char ignore_fpu_irq = 0;
diff --git a/include/asm-i386/desc.h b/include/asm-i386/desc.h
index 5874ef1..a0398f7 100644
--- a/include/asm-i386/desc.h
+++ b/include/asm-i386/desc.h
@@ -33,11 +33,6 @@ static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu)
return (struct desc_struct *)per_cpu(cpu_gdt_descr, cpu).address;
}
-/*
- * This is the ldt that every process will get unless we need
- * something other than this.
- */
-extern struct desc_struct default_ldt[];
extern struct desc_struct idt_table[];
extern void set_intr_gate(unsigned int irq, void * addr);
@@ -65,7 +60,6 @@ static inline void pack_gate(__u32 *a, __u32 *b,
#define DESCTYPE_S 0x10 /* !system */
#define load_TR_desc() __asm__ __volatile__("ltr %w0"::"q" (GDT_ENTRY_TSS*8))
-#define load_LDT_desc() __asm__ __volatile__("lldt %w0"::"q" (GDT_ENTRY_LDT*8))
#define load_gdt(dtr) __asm__ __volatile("lgdt %0"::"m" (*dtr))
#define load_idt(dtr) __asm__ __volatile("lidt %0"::"m" (*dtr))
@@ -115,13 +109,20 @@ static inline void __set_tss_desc(unsigned int cpu, unsigned int entry, const vo
write_gdt_entry(get_cpu_gdt_table(cpu), entry, a, b);
}
-static inline void set_ldt_desc(unsigned int cpu, void *addr, unsigned int entries)
+static inline void set_ldt(void *addr, unsigned int entries)
{
- __u32 a, b;
- pack_descriptor(&a, &b, (unsigned long)addr,
- entries * sizeof(struct desc_struct) - 1,
- DESCTYPE_LDT, 0);
- write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT, a, b);
+ if (likely(entries == 0))
+ __asm__ __volatile__("lldt %w0"::"q" (0));
+ else {
+ unsigned cpu = smp_processor_id();
+ __u32 a, b;
+
+ pack_descriptor(&a, &b, (unsigned long)addr,
+ entries * sizeof(struct desc_struct) - 1,
+ DESCTYPE_LDT, 0);
+ write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT, a, b);
+ __asm__ __volatile__("lldt %w0"::"q" (GDT_ENTRY_LDT*8));
+ }
}
#define set_tss_desc(cpu,addr) __set_tss_desc(cpu, GDT_ENTRY_TSS, addr)
@@ -153,35 +154,22 @@ static inline void set_ldt_desc(unsigned int cpu, void *addr, unsigned int entri
static inline void clear_LDT(void)
{
- int cpu = get_cpu();
-
- set_ldt_desc(cpu, &default_ldt[0], 5);
- load_LDT_desc();
- put_cpu();
+ set_ldt(NULL, 0);
}
/*
* load one particular LDT into the current CPU
*/
-static inline void load_LDT_nolock(mm_context_t *pc, int cpu)
+static inline void load_LDT_nolock(mm_context_t *pc)
{
- void *segments = pc->ldt;
- int count = pc->size;
-
- if (likely(!count)) {
- segments = &default_ldt[0];
- count = 5;
- }
-
- set_ldt_desc(cpu, segments, count);
- load_LDT_desc();
+ set_ldt(pc->ldt, pc->size);
}
static inline void load_LDT(mm_context_t *pc)
{
- int cpu = get_cpu();
- load_LDT_nolock(pc, cpu);
- put_cpu();
+ preempt_disable();
+ load_LDT_nolock(pc);
+ preempt_enable();
}
static inline unsigned long get_desc_base(unsigned long *desc)
diff --git a/include/asm-i386/mmu_context.h b/include/asm-i386/mmu_context.h
index 62b7bf1..1b14953 100644
--- a/include/asm-i386/mmu_context.h
+++ b/include/asm-i386/mmu_context.h
@@ -44,7 +44,7 @@ static inline void switch_mm(struct mm_struct *prev,
* load the LDT, if the LDT is different:
*/
if (unlikely(prev->context.ldt != next->context.ldt))
- load_LDT_nolock(&next->context, cpu);
+ load_LDT_nolock(&next->context);
}
#ifdef CONFIG_SMP
else {
@@ -56,7 +56,7 @@ static inline void switch_mm(struct mm_struct *prev,
* tlb flush IPI delivery. We must reload %cr3.
*/
load_cr3(next->pgd);
- load_LDT_nolock(&next->context, cpu);
+ load_LDT_nolock(&next->context);
}
}
#endif
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