From 9d1c6e7c86ddc366d67f0c5fa77be9b93710037a Mon Sep 17 00:00:00 2001 From: Glauber de Oliveira Costa Date: Fri, 19 Oct 2007 20:35:03 +0200 Subject: 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 Signed-off-by: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- include/asm-x86/desc_64.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'include/asm-x86') 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) { -- cgit v1.2.3