diff options
Diffstat (limited to 'include/asm-i386/rwsem.h')
| -rw-r--r-- | include/asm-i386/rwsem.h | 62 |
1 files changed, 12 insertions, 50 deletions
diff --git a/include/asm-i386/rwsem.h b/include/asm-i386/rwsem.h index 43113f5608eb..bc598d6388e3 100644 --- a/include/asm-i386/rwsem.h +++ b/include/asm-i386/rwsem.h | |||
| @@ -99,17 +99,9 @@ static inline void __down_read(struct rw_semaphore *sem) | |||
| 99 | __asm__ __volatile__( | 99 | __asm__ __volatile__( |
| 100 | "# beginning down_read\n\t" | 100 | "# beginning down_read\n\t" |
| 101 | LOCK_PREFIX " incl (%%eax)\n\t" /* adds 0x00000001, returns the old value */ | 101 | LOCK_PREFIX " incl (%%eax)\n\t" /* adds 0x00000001, returns the old value */ |
| 102 | " js 2f\n\t" /* jump if we weren't granted the lock */ | 102 | " jns 1f\n" |
| 103 | " call call_rwsem_down_read_failed\n" | ||
| 103 | "1:\n\t" | 104 | "1:\n\t" |
| 104 | LOCK_SECTION_START("") | ||
| 105 | "2:\n\t" | ||
| 106 | " pushl %%ecx\n\t" | ||
| 107 | " pushl %%edx\n\t" | ||
| 108 | " call rwsem_down_read_failed\n\t" | ||
| 109 | " popl %%edx\n\t" | ||
| 110 | " popl %%ecx\n\t" | ||
| 111 | " jmp 1b\n" | ||
| 112 | LOCK_SECTION_END | ||
| 113 | "# ending down_read\n\t" | 105 | "# ending down_read\n\t" |
| 114 | : "+m" (sem->count) | 106 | : "+m" (sem->count) |
| 115 | : "a" (sem) | 107 | : "a" (sem) |
| @@ -151,15 +143,9 @@ static inline void __down_write_nested(struct rw_semaphore *sem, int subclass) | |||
| 151 | "# beginning down_write\n\t" | 143 | "# beginning down_write\n\t" |
| 152 | LOCK_PREFIX " xadd %%edx,(%%eax)\n\t" /* subtract 0x0000ffff, returns the old value */ | 144 | LOCK_PREFIX " xadd %%edx,(%%eax)\n\t" /* subtract 0x0000ffff, returns the old value */ |
| 153 | " testl %%edx,%%edx\n\t" /* was the count 0 before? */ | 145 | " testl %%edx,%%edx\n\t" /* was the count 0 before? */ |
| 154 | " jnz 2f\n\t" /* jump if we weren't granted the lock */ | 146 | " jz 1f\n" |
| 155 | "1:\n\t" | 147 | " call call_rwsem_down_write_failed\n" |
| 156 | LOCK_SECTION_START("") | 148 | "1:\n" |
| 157 | "2:\n\t" | ||
| 158 | " pushl %%ecx\n\t" | ||
| 159 | " call rwsem_down_write_failed\n\t" | ||
| 160 | " popl %%ecx\n\t" | ||
| 161 | " jmp 1b\n" | ||
| 162 | LOCK_SECTION_END | ||
| 163 | "# ending down_write" | 149 | "# ending down_write" |
| 164 | : "+m" (sem->count), "=d" (tmp) | 150 | : "+m" (sem->count), "=d" (tmp) |
| 165 | : "a" (sem), "1" (tmp) | 151 | : "a" (sem), "1" (tmp) |
| @@ -193,17 +179,9 @@ static inline void __up_read(struct rw_semaphore *sem) | |||
| 193 | __asm__ __volatile__( | 179 | __asm__ __volatile__( |
| 194 | "# beginning __up_read\n\t" | 180 | "# beginning __up_read\n\t" |
| 195 | LOCK_PREFIX " xadd %%edx,(%%eax)\n\t" /* subtracts 1, returns the old value */ | 181 | LOCK_PREFIX " xadd %%edx,(%%eax)\n\t" /* subtracts 1, returns the old value */ |
| 196 | " js 2f\n\t" /* jump if the lock is being waited upon */ | 182 | " jns 1f\n\t" |
| 197 | "1:\n\t" | 183 | " call call_rwsem_wake\n" |
| 198 | LOCK_SECTION_START("") | 184 | "1:\n" |
| 199 | "2:\n\t" | ||
| 200 | " decw %%dx\n\t" /* do nothing if still outstanding active readers */ | ||
| 201 | " jnz 1b\n\t" | ||
| 202 | " pushl %%ecx\n\t" | ||
| 203 | " call rwsem_wake\n\t" | ||
| 204 | " popl %%ecx\n\t" | ||
| 205 | " jmp 1b\n" | ||
| 206 | LOCK_SECTION_END | ||
| 207 | "# ending __up_read\n" | 185 | "# ending __up_read\n" |
| 208 | : "+m" (sem->count), "=d" (tmp) | 186 | : "+m" (sem->count), "=d" (tmp) |
| 209 | : "a" (sem), "1" (tmp) | 187 | : "a" (sem), "1" (tmp) |
| @@ -219,17 +197,9 @@ static inline void __up_write(struct rw_semaphore *sem) | |||
| 219 | "# beginning __up_write\n\t" | 197 | "# beginning __up_write\n\t" |
| 220 | " movl %2,%%edx\n\t" | 198 | " movl %2,%%edx\n\t" |
| 221 | LOCK_PREFIX " xaddl %%edx,(%%eax)\n\t" /* tries to transition 0xffff0001 -> 0x00000000 */ | 199 | LOCK_PREFIX " xaddl %%edx,(%%eax)\n\t" /* tries to transition 0xffff0001 -> 0x00000000 */ |
| 222 | " jnz 2f\n\t" /* jump if the lock is being waited upon */ | 200 | " jz 1f\n" |
| 201 | " call call_rwsem_wake\n" | ||
| 223 | "1:\n\t" | 202 | "1:\n\t" |
| 224 | LOCK_SECTION_START("") | ||
| 225 | "2:\n\t" | ||
| 226 | " decw %%dx\n\t" /* did the active count reduce to 0? */ | ||
| 227 | " jnz 1b\n\t" /* jump back if not */ | ||
| 228 | " pushl %%ecx\n\t" | ||
| 229 | " call rwsem_wake\n\t" | ||
| 230 | " popl %%ecx\n\t" | ||
| 231 | " jmp 1b\n" | ||
| 232 | LOCK_SECTION_END | ||
| 233 | "# ending __up_write\n" | 203 | "# ending __up_write\n" |
| 234 | : "+m" (sem->count) | 204 | : "+m" (sem->count) |
| 235 | : "a" (sem), "i" (-RWSEM_ACTIVE_WRITE_BIAS) | 205 | : "a" (sem), "i" (-RWSEM_ACTIVE_WRITE_BIAS) |
| @@ -244,17 +214,9 @@ static inline void __downgrade_write(struct rw_semaphore *sem) | |||
| 244 | __asm__ __volatile__( | 214 | __asm__ __volatile__( |
| 245 | "# beginning __downgrade_write\n\t" | 215 | "# beginning __downgrade_write\n\t" |
| 246 | LOCK_PREFIX " addl %2,(%%eax)\n\t" /* transitions 0xZZZZ0001 -> 0xYYYY0001 */ | 216 | LOCK_PREFIX " addl %2,(%%eax)\n\t" /* transitions 0xZZZZ0001 -> 0xYYYY0001 */ |
| 247 | " js 2f\n\t" /* jump if the lock is being waited upon */ | 217 | " jns 1f\n\t" |
| 218 | " call call_rwsem_downgrade_wake\n" | ||
| 248 | "1:\n\t" | 219 | "1:\n\t" |
| 249 | LOCK_SECTION_START("") | ||
| 250 | "2:\n\t" | ||
| 251 | " pushl %%ecx\n\t" | ||
| 252 | " pushl %%edx\n\t" | ||
| 253 | " call rwsem_downgrade_wake\n\t" | ||
| 254 | " popl %%edx\n\t" | ||
| 255 | " popl %%ecx\n\t" | ||
| 256 | " jmp 1b\n" | ||
| 257 | LOCK_SECTION_END | ||
| 258 | "# ending __downgrade_write\n" | 220 | "# ending __downgrade_write\n" |
| 259 | : "+m" (sem->count) | 221 | : "+m" (sem->count) |
| 260 | : "a" (sem), "i" (-RWSEM_WAITING_BIAS) | 222 | : "a" (sem), "i" (-RWSEM_WAITING_BIAS) |