/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ALPHA_ATOMIC_H #define _ALPHA_ATOMIC_H #include <linux/types.h> #include <asm/barrier.h> #include <asm/cmpxchg.h> /* * Atomic operations that C can't guarantee us. Useful for * resource counting etc... * * But use these as seldom as possible since they are much slower * than regular operations. */ /* * To ensure dependency ordering is preserved for the _relaxed and * _release atomics, an smp_read_barrier_depends() is unconditionally * inserted into the _relaxed variants, which are used to build the * barriered versions. To avoid redundant back-to-back fences, we can * define the _acquire and _fence versions explicitly. */ #define __atomic_op_acquire(op, args...) op##_relaxed(args) #define __atomic_op_fence __atomic_op_release #define ATOMIC_INIT(i) { (i) } #define ATOMIC64_INIT(i) { (i) } #define atomic_read(v) READ_ONCE((v)->counter) #define atomic64_read(v) READ_ONCE((v)->counter) #define atomic_set(v,i) WRITE_ONCE((v)->counter, (i)) #define atomic64_set(v,i) WRITE_ONCE((v)->counter, (i)) /* * To get proper branch prediction for the main line, we must branch * forward to code at the end of this object's .text section, then * branch back to restart the operation. */ #define ATOMIC_OP(op, asm_op) \ static __inline__ void atomic_##op(int i, atomic_t * v) \ { \ unsigned long temp; \ __asm__ __volatile__( \ "1: ldl_l %0,%1\n" \ " " #asm_op " %0,%2,%0\n" \ " stl_c %0,%1\n" \ " beq %0,2f\n" \ ".subsection 2\n" \ "2: br 1b\n" \ ".previous" \ :"=&r" (temp), "=m" (v->counter) \ :"Ir" (i), "m" (v->counter)); \ } \ #define ATOMIC_OP_RETURN(op, asm_op) \ static inline int atomic_##op##_return_relaxed(int i, atomic_t *v) \ { \ long temp, result; \ __asm__ __volatile__( \ "1: ldl_l %0,%1\n" \ " " #asm_op " %0,%3,%2\n" \ " " #asm_op " %0,%3,%0\n" \ " stl_c %0,%1\n" \ " beq %0,2f\n" \ ".subsection 2\n" \ "2: br 1b\n" \ ".previous" \ :"=&r" (temp), "=m" (v->counter), "=&r" (result) \ :"Ir" (i), "m" (v->counter) : "memory"); \ smp_read_barrier_depends(); \ return result; \ } #define ATOMIC_FETCH_OP(op, asm_op) \ static inline int atomic_fetch_##op##_relaxed(int i, atomic_t *v) \ { \ long temp, result; \ __asm__ __volatile__( \ "1: ldl_l %2,%1\n" \ " " #asm_op " %2,%3,%0\n" \ " stl_c %0,%1\n" \ " beq %0,2f\n" \ ".subsection 2\n" \ "2: br 1b\n" \ ".previous" \ :"=&r" (temp), "=m" (v->counter), "=&r" (result) \ :"Ir" (i), "m" (v->counter) : "memory"); \ smp_read_barrier_depends(); \ return result; \ } #define ATOMIC64_OP(op, asm_op) \ static __inline__ void atomic64_##op(long i, atomic64_t * v) \ { \ unsigned long temp; \ __asm__ __volatile__( \ "1: ldq_l %0,%1\n" \ " " #asm_op " %0,%2,%0\n" \ " stq_c %0,%1\n" \ " beq %0,2f\n" \ ".subsection 2\n" \ "2: br 1b\n" \ ".previous" \ :"=&r" (temp), "=m" (v->counter) \ :"Ir" (i), "m" (v->counter)); \ } \ #define ATOMIC64_OP_RETURN(op, asm_op) \ static __inline__ long atomic64_##op##_return_relaxed(long i, atomic64_t * v) \ { \ long temp, result; \ __asm__ __volatile__( \ "1: ldq_l %0,%1\n" \ " " #asm_op " %0,%3,%2\n" \ " " #asm_op " %0,%3,%0\n" \ " stq_c %0,%1\n" \ " beq %0,2f\n" \ ".subsection 2\n" \ "2: br 1b\n" \ ".previous" \ :"=&r" (temp), "=m" (v->counter), "=&r" (result) \ :"Ir" (i), "m" (v->counter) : "memory"); \ smp_read_barrier_depends(); \ return result; \ } #define ATOMIC64_FETCH_OP(op, asm_op) \ static __inline__ long atomic64_fetch_##op##_relaxed(long i, atomic64_t * v) \ { \ long temp, result; \ __asm__ __volatile__( \ "1: ldq_l %2,%1\n" \ " " #asm_op " %2,%3,%0\n" \ " stq_c %0,%1\n" \ " beq %0,2f\n" \ ".subsection 2\n" \ "2: br 1b\n" \ ".previous" \ :"=&r" (temp), "=m" (v->counter), "=&r" (result) \ :"Ir" (i), "m" (v->counter) : "memory"); \ smp_read_barrier_depends(); \ return result; \ } #define ATOMIC_OPS(op) \ ATOMIC_OP(op, op##l) \ ATOMIC_OP_RETURN(op, op##l) \ ATOMIC_FETCH_OP(op, op##l) \ ATOMIC64_OP(op, op##q) \ ATOMIC64_OP_RETURN(op, op##q) \ ATOMIC64_FETCH_OP(op, op##q) ATOMIC_OPS(add) ATOMIC_OPS(sub) #define atomic_add_return_relaxed atomic_add_return_relaxed #define atomic_sub_return_relaxed atomic_sub_return_relaxed #define atomic_fetch_add_relaxed atomic_fetch_add_relaxed #define atomic_fetch_sub_relaxed atomic_fetch_sub_relaxed #define atomic64_add_return_relaxed atomic64_add_return_relaxed #define atomic64_sub_return_relaxed atomic64_sub_return_relaxed #define atomic64_fetch_add_relaxed atomic64_fetch_add_relaxed #define atomic64_fetch_sub_relaxed atomic64_fetch_sub_relaxed #define atomic_andnot atomic_andnot #define atomic64_andnot atomic64_andnot #undef ATOMIC_OPS #define ATOMIC_OPS(op, asm) \ ATOMIC_OP(op, asm) \ ATOMIC_FETCH_OP(op, asm) \ ATOMIC64_OP(op, asm) \ ATOMIC64_FETCH_OP(op, asm) ATOMIC_OPS(and, and) ATOMIC_OPS(andnot, bic) ATOMIC_OPS(or, bis) ATOMIC_OPS(xor, xor) #define atomic_fetch_and_relaxed atomic_fetch_and_relaxed #define atomic_fetch_andnot_relaxed atomic_fetch_andnot_relaxed #define atomic_fetch_or_relaxed atomic_fetch_or_relaxed #define atomic_fetch_xor_relaxed atomic_fetch_xor_relaxed #define atomic64_fetch_and_relaxed atomic64_fetch_and_relaxed #define atomic64_fetch_andnot_relaxed atomic64_fetch_andnot_relaxed #define atomic64_fetch_or_relaxed atomic64_fetch_or_relaxed #define atomic64_fetch_xor_relaxed atomic64_fetch_xor_relaxed #undef ATOMIC_OPS #undef ATOMIC64_FETCH_OP #undef ATOMIC64_OP_RETURN #undef ATOMIC64_OP #undef ATOMIC_FETCH_OP #undef ATOMIC_OP_RETURN #undef ATOMIC_OP #define atomic64_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new)) #define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new)) #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) /** * __atomic_add_unless - add unless the number is a given value * @v: pointer of type atomic_t * @a: the amount to add to v... * @u: ...unless v is equal to u. * * Atomically adds @a to @v, so long as it was not @u. * Returns the old value of @v. */ static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u) { int c, new, old; smp_mb(); __asm__ __volatile__( "1: ldl_l %[old],%[mem]\n" " cmpeq %[old],%[u],%[c]\n" " addl %[old],%[a],%[new]\n" " bne %[c],2f\n" " stl_c %[new],%[mem]\n" " beq %[new],3f\n" "2:\n" ".subsection 2\n" "3: br 1b\n" ".previous" : [old] "=&r"(old), [new] "=&r"(new), [c] "=&r"(c) : [mem] "m"(*v), [a] "rI"(a), [u] "rI"((long)u) : "memory"); smp_mb(); return old; } /** * atomic64_add_unless - add unless the number is a given value * @v: pointer of type atomic64_t * @a: the amount to add to v... * @u: ...unless v is equal to u. * * Atomically adds @a to @v, so long as it was not @u. * Returns true iff @v was not @u. */ static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u) { long c, tmp; smp_mb(); __asm__ __volatile__( "1: ldq_l %[tmp],%[mem]\n" " cmpeq %[tmp],%[u],%[c]\n" " addq %[tmp],%[a],%[tmp]\n" " bne %[c],2f\n" " stq_c %[tmp],%[mem]\n" " beq %[tmp],3f\n" "2:\n" ".subsection 2\n" "3: br 1b\n" ".previous" : [tmp] "=&r"(tmp), [c] "=&r"(c) : [mem] "m"(*v), [a] "rI"(a), [u] "rI"(u) : "memory"); smp_mb(); return !c; } /* * atomic64_dec_if_positive - decrement by 1 if old value positive * @v: pointer of type atomic_t * * The function returns the old value of *v minus 1, even if * the atomic variable, v, was not decremented. */ static inline long atomic64_dec_if_positive(atomic64_t *v) { long old, tmp; smp_mb(); __asm__ __volatile__( "1: ldq_l %[old],%[mem]\n" " subq %[old],1,%[tmp]\n" " ble %[old],2f\n" " stq_c %[tmp],%[mem]\n" " beq %[tmp],3f\n" "2:\n" ".subsection 2\n" "3: br 1b\n" ".previous" : [old] "=&r"(old), [tmp] "=&r"(tmp) : [mem] "m"(*v) : "memory"); smp_mb(); return old - 1; } #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) #define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0) #define atomic_dec_return(v) atomic_sub_return(1,(v)) #define atomic64_dec_return(v) atomic64_sub_return(1,(v)) #define atomic_inc_return(v) atomic_add_return(1,(v)) #define atomic64_inc_return(v) atomic64_add_return(1,(v)) #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) #define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0) #define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0) #define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0) #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) #define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0) #define atomic_inc(v) atomic_add(1,(v)) #define atomic64_inc(v) atomic64_add(1,(v)) #define atomic_dec(v) atomic_sub(1,(v)) #define atomic64_dec(v) atomic64_sub(1,(v)) #endif /* _ALPHA_ATOMIC_H */
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Kbuild | File | 320 B | 0644 |
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a.out-core.h | File | 2.41 KB | 0644 |
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a.out.h | File | 574 B | 0644 |
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agp.h | File | 457 B | 0644 |
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agp_backend.h | File | 948 B | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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asm-prototypes.h | File | 405 B | 0644 |
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atomic.h | File | 9.15 KB | 0644 |
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barrier.h | File | 2.17 KB | 0644 |
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bitops.h | File | 8.83 KB | 0644 |
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bug.h | File | 571 B | 0644 |
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bugs.h | File | 294 B | 0644 |
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cache.h | File | 507 B | 0644 |
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cacheflush.h | File | 2.68 KB | 0644 |
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checksum.h | File | 1.93 KB | 0644 |
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cmpxchg.h | File | 1.67 KB | 0644 |
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compiler.h | File | 498 B | 0644 |
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console.h | File | 1.06 KB | 0644 |
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core_apecs.h | File | 16.91 KB | 0644 |
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core_cia.h | File | 15.43 KB | 0644 |
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core_irongate.h | File | 6.63 KB | 0644 |
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core_marvel.h | File | 9.15 KB | 0644 |
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core_mcpcia.h | File | 11.45 KB | 0644 |
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core_polaris.h | File | 2.92 KB | 0644 |
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core_t2.h | File | 19.13 KB | 0644 |
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core_titan.h | File | 11.2 KB | 0644 |
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core_tsunami.h | File | 8.29 KB | 0644 |
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core_wildfire.h | File | 8.45 KB | 0644 |
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delay.h | File | 264 B | 0644 |
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device.h | File | 129 B | 0644 |
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div64.h | File | 31 B | 0644 |
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dma-mapping.h | File | 276 B | 0644 |
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dma.h | File | 12.37 KB | 0644 |
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elf.h | File | 5.71 KB | 0644 |
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emergency-restart.h | File | 149 B | 0644 |
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err_common.h | File | 3.24 KB | 0644 |
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err_ev6.h | File | 116 B | 0644 |
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err_ev7.h | File | 4.37 KB | 0644 |
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extable.h | File | 1.42 KB | 0644 |
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floppy.h | File | 3.07 KB | 0644 |
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fpu.h | File | 1.78 KB | 0644 |
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ftrace.h | File | 12 B | 0644 |
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futex.h | File | 1.97 KB | 0644 |
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gct.h | File | 1.02 KB | 0644 |
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hardirq.h | File | 223 B | 0644 |
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hw_irq.h | File | 302 B | 0644 |
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hwrpb.h | File | 6.9 KB | 0644 |
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io.h | File | 15.03 KB | 0644 |
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io_trivial.h | File | 3.07 KB | 0644 |
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irq.h | File | 2.31 KB | 0644 |
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irq_regs.h | File | 34 B | 0644 |
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irqflags.h | File | 1.17 KB | 0644 |
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jensen.h | File | 8.39 KB | 0644 |
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kdebug.h | File | 32 B | 0644 |
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kmap_types.h | File | 265 B | 0644 |
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linkage.h | File | 256 B | 0644 |
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local.h | File | 2.59 KB | 0644 |
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local64.h | File | 33 B | 0644 |
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machvec.h | File | 3.68 KB | 0644 |
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mc146818rtc.h | File | 680 B | 0644 |
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mce.h | File | 4.04 KB | 0644 |
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mmu.h | File | 203 B | 0644 |
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mmu_context.h | File | 7.09 KB | 0644 |
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mmzone.h | File | 2.98 KB | 0644 |
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module.h | File | 329 B | 0644 |
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page.h | File | 2.46 KB | 0644 |
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pal.h | File | 5.01 KB | 0644 |
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param.h | File | 284 B | 0644 |
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parport.h | File | 536 B | 0644 |
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pci.h | File | 2.87 KB | 0644 |
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percpu.h | File | 527 B | 0644 |
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perf_event.h | File | 105 B | 0644 |
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pgalloc.h | File | 1.82 KB | 0644 |
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pgtable.h | File | 13.17 KB | 0644 |
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processor.h | File | 2.07 KB | 0644 |
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ptrace.h | File | 754 B | 0644 |
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rwsem.h | File | 4.62 KB | 0644 |
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segment.h | File | 132 B | 0644 |
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serial.h | File | 1.01 KB | 0644 |
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sfp-machine.h | File | 2.86 KB | 0644 |
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shmparam.h | File | 191 B | 0644 |
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signal.h | File | 627 B | 0644 |
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smp.h | File | 1.34 KB | 0644 |
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socket.h | File | 310 B | 0644 |
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special_insns.h | File | 925 B | 0644 |
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spinlock.h | File | 2.85 KB | 0644 |
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spinlock_types.h | File | 413 B | 0644 |
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string.h | File | 2.42 KB | 0644 |
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switch_to.h | File | 406 B | 0644 |
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syscall.h | File | 235 B | 0644 |
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termios.h | File | 2.98 KB | 0644 |
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thread_info.h | File | 3.63 KB | 0644 |
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timex.h | File | 827 B | 0644 |
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tlb.h | File | 473 B | 0644 |
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tlbflush.h | File | 3.37 KB | 0644 |
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topology.h | File | 957 B | 0644 |
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types.h | File | 143 B | 0644 |
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uaccess.h | File | 9.56 KB | 0644 |
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ucontext.h | File | 348 B | 0644 |
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unaligned.h | File | 340 B | 0644 |
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unistd.h | File | 494 B | 0644 |
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user.h | File | 2.14 KB | 0644 |
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vga.h | File | 2 KB | 0644 |
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word-at-a-time.h | File | 1.34 KB | 0644 |
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wrperfmon.h | File | 2.56 KB | 0644 |
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xchg.h | File | 5.74 KB | 0644 |
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xor.h | File | 21.71 KB | 0644 |
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