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| author | Glauber de Oliveira Costa <gcosta@redhat.com> | 2007-10-19 22:35:03 +0400 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2007-10-19 22:35:03 +0400 |
| commit | 9d1c6e7c86ddc366d67f0c5fa77be9b93710037a (patch) | |
| tree | 2561f09ea7393c04634352808b6cba2195099b73 /include/asm-x86 | |
| parent | 9d975ebda56699c1b8480e9736caf33a61ccb810 (diff) | |
| download | linux-9d1c6e7c86ddc366d67f0c5fa77be9b93710037a.tar.xz | |
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')
| -rw-r--r-- | include/asm-x86/desc_64.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/include/asm-x86/desc_64.h b/include/asm-x86/desc_64.h index ac991b5ca0fd..7d9c938e69fd 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) { |