diff options
Diffstat (limited to 'libgloss/sparc_leon/asm-leon/spinlock.h')
-rw-r--r-- | libgloss/sparc_leon/asm-leon/spinlock.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/libgloss/sparc_leon/asm-leon/spinlock.h b/libgloss/sparc_leon/asm-leon/spinlock.h new file mode 100644 index 000000000..c3c0a7c4e --- /dev/null +++ b/libgloss/sparc_leon/asm-leon/spinlock.h @@ -0,0 +1,69 @@ +/* + * Copyright (c) 2011 Aeroflex Gaisler + * + * BSD license: + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + + +#ifndef _INCLUDE_LEONSPINLOCK_h +#define _INCLUDE_LEONSPINLOCK_h + +typedef struct +{ + unsigned char lock; +} raw_spinlock_t; + +#define __RAW_SPIN_LOCK_UNLOCKED { 0 } + +typedef struct +{ + volatile unsigned int lock; +} raw_rwlock_t; + +#define __RAW_RW_LOCK_UNLOCKED { 0 } + +static inline void +__raw_spin_lock (raw_spinlock_t * lock) +{ + __asm__ __volatile__ ("\n1:\n\t" "ldstuba [%0]1, %%g2\n\t" /* ASI_LEON23_DCACHE_MISS */ + "orcc %%g2, 0x0, %%g0\n\t" "bne,a 2f\n\t" " ldub [%0], %%g2\n\t" ".subsection 2\n" "2:\n\t" "orcc %%g2, 0x0, %%g0\n\t" "bne,a 2b\n\t" " ldub [%0], %%g2\n\t" "b,a 1b\n\t" ".previous\n": /* no outputs */ + :"r" (lock):"g2", "memory", "cc"); +} + +static inline int +__raw_spin_trylock (raw_spinlock_t * lock) +{ + unsigned int result; + __asm__ __volatile__ ("ldstuba [%1]1, %0" /* ASI_LEON23_DCACHE_MISS */ + :"=r" (result):"r" (lock):"memory"); + return (result == 0); +} + +static inline void +__raw_spin_unlock (raw_spinlock_t * lock) +{ + __asm__ __volatile__ ("stb %%g0, [%0]"::"r" (lock):"memory"); +} + + + +#endif /* _INCLUDE_LEONSPINLOCK_h */ +/* end of include file */ |