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246 lines
5.2 KiB
246 lines
5.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ALPHA_CMPXCHG_H |
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#error Do not include xchg.h directly! |
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#else |
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/* |
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* xchg/xchg_local and cmpxchg/cmpxchg_local share the same code |
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* except that local version do not have the expensive memory barrier. |
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* So this file is included twice from asm/cmpxchg.h. |
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*/ |
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/* |
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* Atomic exchange. |
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* Since it can be used to implement critical sections |
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* it must clobber "memory" (also for interrupts in UP). |
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*/ |
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static inline unsigned long |
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____xchg(_u8, volatile char *m, unsigned long val) |
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{ |
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unsigned long ret, tmp, addr64; |
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__asm__ __volatile__( |
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" andnot %4,7,%3\n" |
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" insbl %1,%4,%1\n" |
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"1: ldq_l %2,0(%3)\n" |
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" extbl %2,%4,%0\n" |
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" mskbl %2,%4,%2\n" |
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" or %1,%2,%2\n" |
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" stq_c %2,0(%3)\n" |
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" beq %2,2f\n" |
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".subsection 2\n" |
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"2: br 1b\n" |
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".previous" |
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: "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64) |
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: "r" ((long)m), "1" (val) : "memory"); |
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return ret; |
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} |
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static inline unsigned long |
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____xchg(_u16, volatile short *m, unsigned long val) |
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{ |
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unsigned long ret, tmp, addr64; |
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__asm__ __volatile__( |
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" andnot %4,7,%3\n" |
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" inswl %1,%4,%1\n" |
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"1: ldq_l %2,0(%3)\n" |
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" extwl %2,%4,%0\n" |
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" mskwl %2,%4,%2\n" |
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" or %1,%2,%2\n" |
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" stq_c %2,0(%3)\n" |
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" beq %2,2f\n" |
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".subsection 2\n" |
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"2: br 1b\n" |
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".previous" |
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: "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64) |
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: "r" ((long)m), "1" (val) : "memory"); |
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return ret; |
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} |
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static inline unsigned long |
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____xchg(_u32, volatile int *m, unsigned long val) |
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{ |
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unsigned long dummy; |
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__asm__ __volatile__( |
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"1: ldl_l %0,%4\n" |
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" bis $31,%3,%1\n" |
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" stl_c %1,%2\n" |
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" beq %1,2f\n" |
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".subsection 2\n" |
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"2: br 1b\n" |
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".previous" |
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: "=&r" (val), "=&r" (dummy), "=m" (*m) |
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: "rI" (val), "m" (*m) : "memory"); |
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return val; |
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} |
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static inline unsigned long |
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____xchg(_u64, volatile long *m, unsigned long val) |
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{ |
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unsigned long dummy; |
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__asm__ __volatile__( |
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"1: ldq_l %0,%4\n" |
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" bis $31,%3,%1\n" |
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" stq_c %1,%2\n" |
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" beq %1,2f\n" |
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".subsection 2\n" |
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"2: br 1b\n" |
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".previous" |
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: "=&r" (val), "=&r" (dummy), "=m" (*m) |
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: "rI" (val), "m" (*m) : "memory"); |
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return val; |
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} |
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/* This function doesn't exist, so you'll get a linker error |
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if something tries to do an invalid xchg(). */ |
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extern void __xchg_called_with_bad_pointer(void); |
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static __always_inline unsigned long |
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____xchg(, volatile void *ptr, unsigned long x, int size) |
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{ |
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switch (size) { |
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case 1: |
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return ____xchg(_u8, ptr, x); |
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case 2: |
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return ____xchg(_u16, ptr, x); |
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case 4: |
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return ____xchg(_u32, ptr, x); |
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case 8: |
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return ____xchg(_u64, ptr, x); |
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} |
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__xchg_called_with_bad_pointer(); |
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return x; |
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} |
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/* |
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* Atomic compare and exchange. Compare OLD with MEM, if identical, |
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* store NEW in MEM. Return the initial value in MEM. Success is |
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* indicated by comparing RETURN with OLD. |
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*/ |
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static inline unsigned long |
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____cmpxchg(_u8, volatile char *m, unsigned char old, unsigned char new) |
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{ |
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unsigned long prev, tmp, cmp, addr64; |
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__asm__ __volatile__( |
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" andnot %5,7,%4\n" |
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" insbl %1,%5,%1\n" |
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"1: ldq_l %2,0(%4)\n" |
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" extbl %2,%5,%0\n" |
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" cmpeq %0,%6,%3\n" |
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" beq %3,2f\n" |
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" mskbl %2,%5,%2\n" |
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" or %1,%2,%2\n" |
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" stq_c %2,0(%4)\n" |
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" beq %2,3f\n" |
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"2:\n" |
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".subsection 2\n" |
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"3: br 1b\n" |
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".previous" |
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: "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64) |
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: "r" ((long)m), "Ir" (old), "1" (new) : "memory"); |
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return prev; |
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} |
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static inline unsigned long |
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____cmpxchg(_u16, volatile short *m, unsigned short old, unsigned short new) |
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{ |
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unsigned long prev, tmp, cmp, addr64; |
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__asm__ __volatile__( |
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" andnot %5,7,%4\n" |
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" inswl %1,%5,%1\n" |
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"1: ldq_l %2,0(%4)\n" |
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" extwl %2,%5,%0\n" |
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" cmpeq %0,%6,%3\n" |
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" beq %3,2f\n" |
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" mskwl %2,%5,%2\n" |
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" or %1,%2,%2\n" |
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" stq_c %2,0(%4)\n" |
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" beq %2,3f\n" |
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"2:\n" |
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".subsection 2\n" |
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"3: br 1b\n" |
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".previous" |
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: "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64) |
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: "r" ((long)m), "Ir" (old), "1" (new) : "memory"); |
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return prev; |
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} |
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static inline unsigned long |
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____cmpxchg(_u32, volatile int *m, int old, int new) |
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{ |
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unsigned long prev, cmp; |
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__asm__ __volatile__( |
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"1: ldl_l %0,%5\n" |
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" cmpeq %0,%3,%1\n" |
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" beq %1,2f\n" |
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" mov %4,%1\n" |
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" stl_c %1,%2\n" |
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" beq %1,3f\n" |
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"2:\n" |
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".subsection 2\n" |
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"3: br 1b\n" |
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".previous" |
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: "=&r"(prev), "=&r"(cmp), "=m"(*m) |
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: "r"((long) old), "r"(new), "m"(*m) : "memory"); |
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return prev; |
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} |
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static inline unsigned long |
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____cmpxchg(_u64, volatile long *m, unsigned long old, unsigned long new) |
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{ |
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unsigned long prev, cmp; |
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__asm__ __volatile__( |
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"1: ldq_l %0,%5\n" |
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" cmpeq %0,%3,%1\n" |
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" beq %1,2f\n" |
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" mov %4,%1\n" |
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" stq_c %1,%2\n" |
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" beq %1,3f\n" |
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"2:\n" |
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".subsection 2\n" |
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"3: br 1b\n" |
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".previous" |
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: "=&r"(prev), "=&r"(cmp), "=m"(*m) |
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: "r"((long) old), "r"(new), "m"(*m) : "memory"); |
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return prev; |
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} |
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/* This function doesn't exist, so you'll get a linker error |
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if something tries to do an invalid cmpxchg(). */ |
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extern void __cmpxchg_called_with_bad_pointer(void); |
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static __always_inline unsigned long |
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____cmpxchg(, volatile void *ptr, unsigned long old, unsigned long new, |
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int size) |
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{ |
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switch (size) { |
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case 1: |
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return ____cmpxchg(_u8, ptr, old, new); |
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case 2: |
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return ____cmpxchg(_u16, ptr, old, new); |
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case 4: |
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return ____cmpxchg(_u32, ptr, old, new); |
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case 8: |
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return ____cmpxchg(_u64, ptr, old, new); |
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} |
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__cmpxchg_called_with_bad_pointer(); |
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return old; |
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} |
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#endif
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