arch/x86/include/asm/rwlock.h

   1 #ifndef _ASM_X86_RWLOCK_H
   2 #define _ASM_X86_RWLOCK_H
   3
   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 }
  46
  47 /* Actual code is in asm/spinlock.h or in arch/x86/lib/rwlock.S */
  48
  49 #endif /* _ASM_X86_RWLOCK_H */