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authorGlauber de Oliveira Costa <gcosta@redhat.com>2007-10-19 20:35:03 +0200
committerThomas Gleixner <tglx@linutronix.de>2007-10-19 20:35:03 +0200
commit9d1c6e7c86ddc366d67f0c5fa77be9b93710037a (patch)
tree2561f09ea7393c04634352808b6cba2195099b73 /include/asm-x86/desc_64.h
parent9d975ebda56699c1b8480e9736caf33a61ccb810 (diff)
x86: use descriptor's functions instead of inline assembly
This patch provides a new set of functions for managing the descriptor tables that can be used instead of putting the raw assembly in .c files. Remodeling of store_tr() suggested by Frederik Deweerdt. [ tglx: arch/x86 adaptation ] Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/asm-x86/desc_64.h')
-rw-r--r--include/asm-x86/desc_64.h30
1 files changed, 30 insertions, 0 deletions
diff --git a/include/asm-x86/desc_64.h b/include/asm-x86/desc_64.h
index ac991b5ca0f..7d9c938e69f 100644
--- a/include/asm-x86/desc_64.h
+++ b/include/asm-x86/desc_64.h
@@ -20,6 +20,16 @@ extern struct desc_struct cpu_gdt_table[GDT_ENTRIES];
#define load_LDT_desc() asm volatile("lldt %w0"::"r" (GDT_ENTRY_LDT*8))
#define clear_LDT() asm volatile("lldt %w0"::"r" (0))
+static inline unsigned long __store_tr(void)
+{
+ unsigned long tr;
+
+ asm volatile ("str %w0":"=r" (tr));
+ return tr;
+}
+
+#define store_tr(tr) (tr) = __store_tr()
+
/*
* This is the ldt that every process will get unless we need
* something other than this.
@@ -31,6 +41,16 @@ extern struct desc_ptr cpu_gdt_descr[];
/* the cpu gdt accessor */
#define cpu_gdt(_cpu) ((struct desc_struct *)cpu_gdt_descr[_cpu].address)
+static inline void load_gdt(const struct desc_ptr *ptr)
+{
+ asm volatile("lgdt %w0"::"m" (*ptr));
+}
+
+static inline void store_gdt(struct desc_ptr *ptr)
+{
+ asm("sgdt %w0":"=m" (*ptr));
+}
+
static inline void _set_gate(void *adr, unsigned type, unsigned long func, unsigned dpl, unsigned ist)
{
struct gate_struct s;
@@ -71,6 +91,16 @@ static inline void set_system_gate_ist(int nr, void *func, unsigned ist)
_set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, ist);
}
+static inline void load_idt(const struct desc_ptr *ptr)
+{
+ asm volatile("lidt %w0"::"m" (*ptr));
+}
+
+static inline void store_idt(struct desc_ptr *dtr)
+{
+ asm("sidt %w0":"=m" (*dtr));
+}
+
static inline void set_tssldt_descriptor(void *ptr, unsigned long tss, unsigned type,
unsigned size)
{