-typedef struct {
- volatile unsigned long lock;
- volatile unsigned long owner_pc;
-} rwlock_t;
-
-#define RW_LOCK_UNLOCKED (rwlock_t) { 0, 0 }
-
-#define rwlock_init(x) do { *(x) = RW_LOCK_UNLOCKED; } while(0)
-
-#define rwlock_is_locked(x) ((x)->lock != 0)
-
-#ifndef __s390x__
-#define _raw_read_lock(rw) \
- asm volatile(" l 2,0(%1)\n" \
- " j 1f\n" \
- "0: diag 0,0,68\n" \
- "1: la 2,0(2)\n" /* clear high (=write) bit */ \
- " la 3,1(2)\n" /* one more reader */ \
- " cs 2,3,0(%1)\n" /* try to write new value */ \
- " jl 0b" \
- : "=m" ((rw)->lock) : "a" (&(rw)->lock), \
- "m" ((rw)->lock) : "2", "3", "cc", "memory" )
-#else /* __s390x__ */
-#define _raw_read_lock(rw) \
- asm volatile(" lg 2,0(%1)\n" \
- " j 1f\n" \
- "0: " __DIAG44_INSN " 0,%2\n" \
- "1: nihh 2,0x7fff\n" /* clear high (=write) bit */ \
- " la 3,1(2)\n" /* one more reader */ \
- " csg 2,3,0(%1)\n" /* try to write new value */ \
- " jl 0b" \
- : "=m" ((rw)->lock) \
- : "a" (&(rw)->lock), "i" (__DIAG44_OPERAND), \
- "m" ((rw)->lock) : "2", "3", "cc", "memory" )
-#endif /* __s390x__ */
-
-#ifndef __s390x__
-#define _raw_read_unlock(rw) \
- asm volatile(" l 2,0(%1)\n" \
- " j 1f\n" \
- "0: diag 0,0,68\n" \
- "1: lr 3,2\n" \
- " ahi 3,-1\n" /* one less reader */ \
- " cs 2,3,0(%1)\n" \
- " jl 0b" \
- : "=m" ((rw)->lock) : "a" (&(rw)->lock), \
- "m" ((rw)->lock) : "2", "3", "cc", "memory" )
-#else /* __s390x__ */
-#define _raw_read_unlock(rw) \
- asm volatile(" lg 2,0(%1)\n" \
- " j 1f\n" \
- "0: " __DIAG44_INSN " 0,%2\n" \
- "1: lgr 3,2\n" \
- " bctgr 3,0\n" /* one less reader */ \
- " csg 2,3,0(%1)\n" \
- " jl 0b" \
- : "=m" ((rw)->lock) \
- : "a" (&(rw)->lock), "i" (__DIAG44_OPERAND), \
- "m" ((rw)->lock) : "2", "3", "cc", "memory" )
-#endif /* __s390x__ */
-
-#ifndef __s390x__
-#define _raw_write_lock(rw) \
- asm volatile(" lhi 3,1\n" \
- " sll 3,31\n" /* new lock value = 0x80000000 */ \
- " j 1f\n" \
- "0: diag 0,0,68\n" \
- "1: slr 2,2\n" /* old lock value must be 0 */ \
- " cs 2,3,0(%1)\n" \
- " jl 0b" \
- : "=m" ((rw)->lock) : "a" (&(rw)->lock), \
- "m" ((rw)->lock) : "2", "3", "cc", "memory" )
-#else /* __s390x__ */
-#define _raw_write_lock(rw) \
- asm volatile(" llihh 3,0x8000\n" /* new lock value = 0x80...0 */ \
- " j 1f\n" \
- "0: " __DIAG44_INSN " 0,%2\n" \
- "1: slgr 2,2\n" /* old lock value must be 0 */ \
- " csg 2,3,0(%1)\n" \
- " jl 0b" \
- : "=m" ((rw)->lock) \
- : "a" (&(rw)->lock), "i" (__DIAG44_OPERAND), \
- "m" ((rw)->lock) : "2", "3", "cc", "memory" )
-#endif /* __s390x__ */
-
-#ifndef __s390x__
-#define _raw_write_unlock(rw) \
- asm volatile(" slr 3,3\n" /* new lock value = 0 */ \
- " j 1f\n" \
- "0: diag 0,0,68\n" \
- "1: lhi 2,1\n" \
- " sll 2,31\n" /* old lock value must be 0x80000000 */ \
- " cs 2,3,0(%1)\n" \
- " jl 0b" \
- : "=m" ((rw)->lock) : "a" (&(rw)->lock), \
- "m" ((rw)->lock) : "2", "3", "cc", "memory" )
-#else /* __s390x__ */
-#define _raw_write_unlock(rw) \
- asm volatile(" slgr 3,3\n" /* new lock value = 0 */ \
- " j 1f\n" \
- "0: " __DIAG44_INSN " 0,%2\n" \
- "1: llihh 2,0x8000\n" /* old lock value must be 0x8..0 */\
- " csg 2,3,0(%1)\n" \
- " jl 0b" \
- : "=m" ((rw)->lock) \
- : "a" (&(rw)->lock), "i" (__DIAG44_OPERAND), \
- "m" ((rw)->lock) : "2", "3", "cc", "memory" )
-#endif /* __s390x__ */
-
-extern inline int _raw_write_trylock(rwlock_t *rw)