diff options
Diffstat (limited to 'arch/metag/include/asm/spinlock_lnkget.h')
| -rw-r--r-- | arch/metag/include/asm/spinlock_lnkget.h | 213 |
1 files changed, 0 insertions, 213 deletions
diff --git a/arch/metag/include/asm/spinlock_lnkget.h b/arch/metag/include/asm/spinlock_lnkget.h deleted file mode 100644 index dfd780eab350..000000000000 --- a/arch/metag/include/asm/spinlock_lnkget.h +++ /dev/null @@ -1,213 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -#ifndef __ASM_SPINLOCK_LNKGET_H -#define __ASM_SPINLOCK_LNKGET_H - -/* - * None of these asm statements clobber memory as LNKSET writes around - * the cache so the memory it modifies cannot safely be read by any means - * other than these accessors. - */ - -static inline int arch_spin_is_locked(arch_spinlock_t *lock) -{ - int ret; - - asm volatile ("LNKGETD %0, [%1]\n" - "TST %0, #1\n" - "MOV %0, #1\n" - "XORZ %0, %0, %0\n" - : "=&d" (ret) - : "da" (&lock->lock) - : "cc"); - return ret; -} - -static inline void arch_spin_lock(arch_spinlock_t *lock) -{ - int tmp; - - asm volatile ("1: LNKGETD %0,[%1]\n" - " TST %0, #1\n" - " ADD %0, %0, #1\n" - " LNKSETDZ [%1], %0\n" - " BNZ 1b\n" - " DEFR %0, TXSTAT\n" - " ANDT %0, %0, #HI(0x3f000000)\n" - " CMPT %0, #HI(0x02000000)\n" - " BNZ 1b\n" - : "=&d" (tmp) - : "da" (&lock->lock) - : "cc"); - - smp_mb(); -} - -/* Returns 0 if failed to acquire lock */ -static inline int arch_spin_trylock(arch_spinlock_t *lock) -{ - int tmp; - - asm volatile (" LNKGETD %0,[%1]\n" - " TST %0, #1\n" - " ADD %0, %0, #1\n" - " LNKSETDZ [%1], %0\n" - " BNZ 1f\n" - " DEFR %0, TXSTAT\n" - " ANDT %0, %0, #HI(0x3f000000)\n" - " CMPT %0, #HI(0x02000000)\n" - " MOV %0, #1\n" - "1: XORNZ %0, %0, %0\n" - : "=&d" (tmp) - : "da" (&lock->lock) - : "cc"); - - smp_mb(); - - return tmp; -} - -static inline void arch_spin_unlock(arch_spinlock_t *lock) -{ - smp_mb(); - - asm volatile (" SETD [%0], %1\n" - : - : "da" (&lock->lock), "da" (0) - : "memory"); -} - -/* - * RWLOCKS - * - * - * Write locks are easy - we just set bit 31. When unlocking, we can - * just write zero since the lock is exclusively held. - */ - -static inline void arch_write_lock(arch_rwlock_t *rw) -{ - int tmp; - - asm volatile ("1: LNKGETD %0,[%1]\n" - " CMP %0, #0\n" - " ADD %0, %0, %2\n" - " LNKSETDZ [%1], %0\n" - " BNZ 1b\n" - " DEFR %0, TXSTAT\n" - " ANDT %0, %0, #HI(0x3f000000)\n" - " CMPT %0, #HI(0x02000000)\n" - " BNZ 1b\n" - : "=&d" (tmp) - : "da" (&rw->lock), "bd" (0x80000000) - : "cc"); - - smp_mb(); -} - -static inline int arch_write_trylock(arch_rwlock_t *rw) -{ - int tmp; - - asm volatile (" LNKGETD %0,[%1]\n" - " CMP %0, #0\n" - " ADD %0, %0, %2\n" - " LNKSETDZ [%1], %0\n" - " BNZ 1f\n" - " DEFR %0, TXSTAT\n" - " ANDT %0, %0, #HI(0x3f000000)\n" - " CMPT %0, #HI(0x02000000)\n" - " MOV %0,#1\n" - "1: XORNZ %0, %0, %0\n" - : "=&d" (tmp) - : "da" (&rw->lock), "bd" (0x80000000) - : "cc"); - - smp_mb(); - - return tmp; -} - -static inline void arch_write_unlock(arch_rwlock_t *rw) -{ - smp_mb(); - - asm volatile (" SETD [%0], %1\n" - : - : "da" (&rw->lock), "da" (0) - : "memory"); -} - -/* - * Read locks are a bit more hairy: - * - Exclusively load the lock value. - * - Increment it. - * - Store new lock value if positive, and we still own this location. - * If the value is negative, we've already failed. - * - If we failed to store the value, we want a negative result. - * - If we failed, try again. - * Unlocking is similarly hairy. We may have multiple read locks - * currently active. However, we know we won't have any write - * locks. - */ -static inline void arch_read_lock(arch_rwlock_t *rw) -{ - int tmp; - - asm volatile ("1: LNKGETD %0,[%1]\n" - " ADDS %0, %0, #1\n" - " LNKSETDPL [%1], %0\n" - " BMI 1b\n" - " DEFR %0, TXSTAT\n" - " ANDT %0, %0, #HI(0x3f000000)\n" - " CMPT %0, #HI(0x02000000)\n" - " BNZ 1b\n" - : "=&d" (tmp) - : "da" (&rw->lock) - : "cc"); - - smp_mb(); -} - -static inline void arch_read_unlock(arch_rwlock_t *rw) -{ - int tmp; - - smp_mb(); - - asm volatile ("1: LNKGETD %0,[%1]\n" - " SUB %0, %0, #1\n" - " LNKSETD [%1], %0\n" - " DEFR %0, TXSTAT\n" - " ANDT %0, %0, #HI(0x3f000000)\n" - " CMPT %0, #HI(0x02000000)\n" - " BNZ 1b\n" - : "=&d" (tmp) - : "da" (&rw->lock) - : "cc", "memory"); -} - -static inline int arch_read_trylock(arch_rwlock_t *rw) -{ - int tmp; - - asm volatile (" LNKGETD %0,[%1]\n" - " ADDS %0, %0, #1\n" - " LNKSETDPL [%1], %0\n" - " BMI 1f\n" - " DEFR %0, TXSTAT\n" - " ANDT %0, %0, #HI(0x3f000000)\n" - " CMPT %0, #HI(0x02000000)\n" - " MOV %0,#1\n" - " BZ 2f\n" - "1: MOV %0,#0\n" - "2:\n" - : "=&d" (tmp) - : "da" (&rw->lock) - : "cc"); - - smp_mb(); - - return tmp; -} - -#endif /* __ASM_SPINLOCK_LNKGET_H */ |