H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 1 | #ifndef _ASM_X86_RWLOCK_H |
| 2 | #define _ASM_X86_RWLOCK_H |
Thomas Gleixner | 003a46c | 2007-10-15 13:57:47 +0200 | [diff] [blame] | 3 | |
Jan Beulich | a750036 | 2011-07-19 13:00:45 +0100 | [diff] [blame] | 4 | #include <asm/asm.h> |
| 5 | |
| 6 | #if CONFIG_NR_CPUS <= 2048 |
| 7 | |
| 8 | #ifndef __ASSEMBLY__ |
| 9 | typedef union { |
| 10 | s32 lock; |
| 11 | s32 write; |
| 12 | } arch_rwlock_t; |
| 13 | #endif |
| 14 | |
| 15 | #define RW_LOCK_BIAS 0x00100000 |
| 16 | #define READ_LOCK_SIZE(insn) __ASM_FORM(insn##l) |
| 17 | #define READ_LOCK_ATOMIC(n) atomic_##n |
| 18 | #define WRITE_LOCK_ADD(n) __ASM_FORM_COMMA(addl n) |
| 19 | #define WRITE_LOCK_SUB(n) __ASM_FORM_COMMA(subl n) |
| 20 | #define WRITE_LOCK_CMP RW_LOCK_BIAS |
| 21 | |
| 22 | #else /* CONFIG_NR_CPUS > 2048 */ |
| 23 | |
| 24 | #include <linux/const.h> |
| 25 | |
| 26 | #ifndef __ASSEMBLY__ |
| 27 | typedef union { |
| 28 | s64 lock; |
| 29 | struct { |
| 30 | u32 read; |
| 31 | s32 write; |
| 32 | }; |
| 33 | } arch_rwlock_t; |
| 34 | #endif |
| 35 | |
| 36 | #define RW_LOCK_BIAS (_AC(1,L) << 32) |
| 37 | #define READ_LOCK_SIZE(insn) __ASM_FORM(insn##q) |
| 38 | #define READ_LOCK_ATOMIC(n) atomic64_##n |
| 39 | #define WRITE_LOCK_ADD(n) __ASM_FORM(incl) |
| 40 | #define WRITE_LOCK_SUB(n) __ASM_FORM(decl) |
| 41 | #define WRITE_LOCK_CMP 1 |
| 42 | |
| 43 | #endif /* CONFIG_NR_CPUS */ |
| 44 | |
| 45 | #define __ARCH_RW_LOCK_UNLOCKED { RW_LOCK_BIAS } |
Thomas Gleixner | 003a46c | 2007-10-15 13:57:47 +0200 | [diff] [blame] | 46 | |
| 47 | /* Actual code is in asm/spinlock.h or in arch/x86/lib/rwlock.S */ |
| 48 | |
H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 49 | #endif /* _ASM_X86_RWLOCK_H */ |