/* atomic.h: atomic operation emulation for FR-V * * For an explanation of how atomic ops work in this arch, see: * Documentation/frv/atomic-ops.txt * * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _ASM_ATOMIC_H #define _ASM_ATOMIC_H #include <linux/types.h> #include <asm/cmpxchg.h> #include <asm/barrier.h> #ifdef CONFIG_SMP #error not SMP safe #endif #include <asm/atomic_defs.h> /* * Atomic operations that C can't guarantee us. Useful for * resource counting etc.. * * We do not have SMP systems, so we don't have to deal with that. */ #define ATOMIC_INIT(i) { (i) } #define atomic_read(v) READ_ONCE((v)->counter) #define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i)) static inline int atomic_inc_return(atomic_t *v) { return __atomic_add_return(1, &v->counter); } static inline int atomic_dec_return(atomic_t *v) { return __atomic_sub_return(1, &v->counter); } static inline int atomic_add_return(int i, atomic_t *v) { return __atomic_add_return(i, &v->counter); } static inline int atomic_sub_return(int i, atomic_t *v) { return __atomic_sub_return(i, &v->counter); } static inline int atomic_add_negative(int i, atomic_t *v) { return atomic_add_return(i, v) < 0; } static inline void atomic_inc(atomic_t *v) { atomic_inc_return(v); } static inline void atomic_dec(atomic_t *v) { atomic_dec_return(v); } #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) #define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0) /* * 64-bit atomic ops */ typedef struct { long long counter; } atomic64_t; #define ATOMIC64_INIT(i) { (i) } static inline long long atomic64_read(const atomic64_t *v) { long long counter; asm("ldd%I1 %M1,%0" : "=e"(counter) : "m"(v->counter)); return counter; } static inline void atomic64_set(atomic64_t *v, long long i) { asm volatile("std%I0 %1,%M0" : "=m"(v->counter) : "e"(i)); } static inline long long atomic64_inc_return(atomic64_t *v) { return __atomic64_add_return(1, &v->counter); } static inline long long atomic64_dec_return(atomic64_t *v) { return __atomic64_sub_return(1, &v->counter); } static inline long long atomic64_add_return(long long i, atomic64_t *v) { return __atomic64_add_return(i, &v->counter); } static inline long long atomic64_sub_return(long long i, atomic64_t *v) { return __atomic64_sub_return(i, &v->counter); } static inline long long atomic64_add_negative(long long i, atomic64_t *v) { return atomic64_add_return(i, v) < 0; } static inline void atomic64_inc(atomic64_t *v) { atomic64_inc_return(v); } static inline void atomic64_dec(atomic64_t *v) { atomic64_dec_return(v); } #define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0) #define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0) #define atomic64_inc_and_test(v) (atomic64_inc_return((v)) == 0) #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) #define atomic_cmpxchg(v, old, new) (cmpxchg(&(v)->counter, old, new)) #define atomic_xchg(v, new) (xchg(&(v)->counter, new)) #define atomic64_cmpxchg(v, old, new) (__cmpxchg_64(old, new, &(v)->counter)) #define atomic64_xchg(v, new) (__xchg_64(new, &(v)->counter)) static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u) { int c, old; c = atomic_read(v); for (;;) { if (unlikely(c == (u))) break; old = atomic_cmpxchg((v), c, c + (a)); if (likely(old == c)) break; c = old; } return c; } static inline int atomic64_add_unless(atomic64_t *v, long long i, long long u) { long long c, old; c = atomic64_read(v); for (;;) { if (unlikely(c == u)) break; old = atomic64_cmpxchg(v, c, c + i); if (likely(old == c)) break; c = old; } return c != u; } static inline long long atomic64_dec_if_positive(atomic64_t *v) { long long c, old, dec; c = atomic64_read(v); for (;;) { dec = c - 1; if (unlikely(dec < 0)) break; old = atomic64_cmpxchg((v), c, dec); if (likely(old == c)) break; c = old; } return dec; } #define ATOMIC_OP(op) \ static inline int atomic_fetch_##op(int i, atomic_t *v) \ { \ return __atomic32_fetch_##op(i, &v->counter); \ } \ static inline void atomic_##op(int i, atomic_t *v) \ { \ (void)__atomic32_fetch_##op(i, &v->counter); \ } \ \ static inline long long atomic64_fetch_##op(long long i, atomic64_t *v) \ { \ return __atomic64_fetch_##op(i, &v->counter); \ } \ static inline void atomic64_##op(long long i, atomic64_t *v) \ { \ (void)__atomic64_fetch_##op(i, &v->counter); \ } ATOMIC_OP(or) ATOMIC_OP(and) ATOMIC_OP(xor) ATOMIC_OP(add) ATOMIC_OP(sub) #undef ATOMIC_OP #endif /* _ASM_ATOMIC_H */
Name | Type | Size | Permission | Actions |
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Kbuild | File | 290 B | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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atomic.h | File | 4.97 KB | 0644 |
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atomic_defs.h | File | 4.66 KB | 0644 |
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ax88796.h | File | 751 B | 0644 |
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barrier.h | File | 720 B | 0644 |
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bitops.h | File | 7.12 KB | 0644 |
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bug.h | File | 1.36 KB | 0644 |
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bugs.h | File | 445 B | 0644 |
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busctl-regs.h | File | 2.02 KB | 0644 |
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cache.h | File | 727 B | 0644 |
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cacheflush.h | File | 3.05 KB | 0644 |
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checksum.h | File | 4.53 KB | 0644 |
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cmpxchg.h | File | 4.56 KB | 0644 |
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cpu-irqs.h | File | 2.59 KB | 0644 |
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current.h | File | 685 B | 0644 |
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delay.h | File | 1.28 KB | 0644 |
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div64.h | File | 31 B | 0644 |
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dm9000.h | File | 1.12 KB | 0644 |
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dma-mapping.h | File | 448 B | 0644 |
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dma.h | File | 3.63 KB | 0644 |
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elf.h | File | 5.18 KB | 0644 |
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emergency-restart.h | File | 149 B | 0644 |
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fpu.h | File | 261 B | 0644 |
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ftrace.h | File | 12 B | 0644 |
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futex.h | File | 416 B | 0644 |
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gdb-stub.h | File | 4.47 KB | 0644 |
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gpio-regs.h | File | 3.64 KB | 0644 |
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hardirq.h | File | 666 B | 0644 |
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highmem.h | File | 4.09 KB | 0644 |
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hw_irq.h | File | 484 B | 0644 |
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io.h | File | 9.75 KB | 0644 |
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irc-regs.h | File | 1.78 KB | 0644 |
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irq.h | File | 760 B | 0644 |
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irq_regs.h | File | 764 B | 0644 |
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irqflags.h | File | 3.71 KB | 0644 |
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kdebug.h | File | 32 B | 0644 |
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kmap_types.h | File | 123 B | 0644 |
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linkage.h | File | 114 B | 0644 |
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local.h | File | 140 B | 0644 |
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local64.h | File | 33 B | 0644 |
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math-emu.h | File | 6.38 KB | 0644 |
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mb-regs.h | File | 6.94 KB | 0644 |
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mb86943a.h | File | 1.84 KB | 0644 |
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mb93091-fpga-irqs.h | File | 1.06 KB | 0644 |
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mb93093-fpga-irqs.h | File | 789 B | 0644 |
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mb93493-irqs.h | File | 1.69 KB | 0644 |
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mb93493-regs.h | File | 12.46 KB | 0644 |
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mem-layout.h | File | 2.21 KB | 0644 |
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mmu.h | File | 1.26 KB | 0644 |
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mmu_context.h | File | 1.38 KB | 0644 |
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module.h | File | 617 B | 0644 |
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page.h | File | 2.08 KB | 0644 |
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pci.h | File | 1.23 KB | 0644 |
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percpu.h | File | 147 B | 0644 |
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perf_event.h | File | 487 B | 0644 |
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pgalloc.h | File | 1.87 KB | 0644 |
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pgtable.h | File | 16.02 KB | 0644 |
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processor.h | File | 2.85 KB | 0644 |
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ptrace.h | File | 1.2 KB | 0644 |
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sections.h | File | 1.1 KB | 0644 |
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segment.h | File | 1.08 KB | 0644 |
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serial-regs.h | File | 1.63 KB | 0644 |
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serial.h | File | 308 B | 0644 |
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setup.h | File | 641 B | 0644 |
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shmparam.h | File | 183 B | 0644 |
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signal.h | File | 141 B | 0644 |
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smp.h | File | 139 B | 0644 |
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spinlock.h | File | 516 B | 0644 |
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spr-regs.h | File | 17.93 KB | 0644 |
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string.h | File | 1.36 KB | 0644 |
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switch_to.h | File | 1.07 KB | 0644 |
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syscall.h | File | 2.73 KB | 0644 |
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termios.h | File | 425 B | 0644 |
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thread_info.h | File | 3.48 KB | 0644 |
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timer-regs.h | File | 3.63 KB | 0644 |
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timex.h | File | 720 B | 0644 |
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tlb.h | File | 615 B | 0644 |
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tlbflush.h | File | 1.88 KB | 0644 |
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topology.h | File | 229 B | 0644 |
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types.h | File | 595 B | 0644 |
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uaccess.h | File | 6.79 KB | 0644 |
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ucontext.h | File | 281 B | 0644 |
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unaligned.h | File | 694 B | 0644 |
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unistd.h | File | 928 B | 0644 |
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user.h | File | 3.29 KB | 0644 |
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vga.h | File | 464 B | 0644 |
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virtconvert.h | File | 1.09 KB | 0644 |
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xor.h | File | 29 B | 0644 |
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