/* * Copyright 2010 Tilera Corporation. All Rights Reserved. * * 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, version 2. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for * more details. * * Atomic primitives. */ #ifndef _ASM_TILE_ATOMIC_H #define _ASM_TILE_ATOMIC_H #include <asm/cmpxchg.h> #ifndef __ASSEMBLY__ #include <linux/compiler.h> #include <linux/types.h> #define ATOMIC_INIT(i) { (i) } /** * atomic_read - read atomic variable * @v: pointer of type atomic_t * * Atomically reads the value of @v. */ static inline int atomic_read(const atomic_t *v) { return READ_ONCE(v->counter); } /** * atomic_sub_return - subtract integer and return * @v: pointer of type atomic_t * @i: integer value to subtract * * Atomically subtracts @i from @v and returns @v - @i */ #define atomic_sub_return(i, v) atomic_add_return((int)(-(i)), (v)) #define atomic_fetch_sub(i, v) atomic_fetch_add(-(int)(i), (v)) /** * atomic_sub - subtract integer from atomic variable * @i: integer value to subtract * @v: pointer of type atomic_t * * Atomically subtracts @i from @v. */ #define atomic_sub(i, v) atomic_add((int)(-(i)), (v)) /** * atomic_sub_and_test - subtract value from variable and test result * @i: integer value to subtract * @v: pointer of type atomic_t * * Atomically subtracts @i from @v and returns true if the result is * zero, or false for all other cases. */ #define atomic_sub_and_test(i, v) (atomic_sub_return((i), (v)) == 0) /** * atomic_inc_return - increment memory and return * @v: pointer of type atomic_t * * Atomically increments @v by 1 and returns the new value. */ #define atomic_inc_return(v) atomic_add_return(1, (v)) /** * atomic_dec_return - decrement memory and return * @v: pointer of type atomic_t * * Atomically decrements @v by 1 and returns the new value. */ #define atomic_dec_return(v) atomic_sub_return(1, (v)) /** * atomic_inc - increment atomic variable * @v: pointer of type atomic_t * * Atomically increments @v by 1. */ #define atomic_inc(v) atomic_add(1, (v)) /** * atomic_dec - decrement atomic variable * @v: pointer of type atomic_t * * Atomically decrements @v by 1. */ #define atomic_dec(v) atomic_sub(1, (v)) /** * atomic_dec_and_test - decrement and test * @v: pointer of type atomic_t * * Atomically decrements @v by 1 and returns true if the result is 0. */ #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0) /** * atomic_inc_and_test - increment and test * @v: pointer of type atomic_t * * Atomically increments @v by 1 and returns true if the result is 0. */ #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) /** * atomic_xchg - atomically exchange contents of memory with a new value * @v: pointer of type atomic_t * @i: integer value to store in memory * * Atomically sets @v to @i and returns old @v */ static inline int atomic_xchg(atomic_t *v, int n) { return xchg(&v->counter, n); } /** * atomic_cmpxchg - atomically exchange contents of memory if it matches * @v: pointer of type atomic_t * @o: old value that memory should have * @n: new value to write to memory if it matches * * Atomically checks if @v holds @o and replaces it with @n if so. * Returns the old value at @v. */ static inline int atomic_cmpxchg(atomic_t *v, int o, int n) { return cmpxchg(&v->counter, o, n); } /** * atomic_add_negative - add and test if negative * @v: pointer of type atomic_t * @i: integer value to add * * Atomically adds @i to @v and returns true if the result is * negative, or false when result is greater than or equal to zero. */ #define atomic_add_negative(i, v) (atomic_add_return((i), (v)) < 0) #endif /* __ASSEMBLY__ */ #ifndef __tilegx__ #include <asm/atomic_32.h> #else #include <asm/atomic_64.h> #endif #ifndef __ASSEMBLY__ /** * atomic64_xchg - atomically exchange contents of memory with a new value * @v: pointer of type atomic64_t * @i: integer value to store in memory * * Atomically sets @v to @i and returns old @v */ static inline long long atomic64_xchg(atomic64_t *v, long long n) { return xchg64(&v->counter, n); } /** * atomic64_cmpxchg - atomically exchange contents of memory if it matches * @v: pointer of type atomic64_t * @o: old value that memory should have * @n: new value to write to memory if it matches * * Atomically checks if @v holds @o and replaces it with @n if so. * Returns the old value at @v. */ static inline long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n) { return cmpxchg64(&v->counter, o, n); } 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; } #endif /* __ASSEMBLY__ */ #endif /* _ASM_TILE_ATOMIC_H */
Name | Type | Size | Permission | Actions |
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Kbuild | File | 439 B | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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atomic.h | File | 5.14 KB | 0644 |
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atomic_32.h | File | 8.91 KB | 0644 |
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atomic_64.h | File | 5.51 KB | 0644 |
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backtrace.h | File | 3.98 KB | 0644 |
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barrier.h | File | 2.89 KB | 0644 |
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bitops.h | File | 2.37 KB | 0644 |
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bitops_32.h | File | 4.01 KB | 0644 |
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bitops_64.h | File | 2.67 KB | 0644 |
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cache.h | File | 2.6 KB | 0644 |
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cacheflush.h | File | 4.94 KB | 0644 |
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checksum.h | File | 1.23 KB | 0644 |
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cmpxchg.h | File | 3.47 KB | 0644 |
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compat.h | File | 7.38 KB | 0644 |
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current.h | File | 947 B | 0644 |
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delay.h | File | 1.1 KB | 0644 |
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device.h | File | 978 B | 0644 |
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div64.h | File | 319 B | 0644 |
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dma-mapping.h | File | 1.82 KB | 0644 |
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dma.h | File | 762 B | 0644 |
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elf.h | File | 5.42 KB | 0644 |
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fixmap.h | File | 2.73 KB | 0644 |
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ftrace.h | File | 1.08 KB | 0644 |
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futex.h | File | 4.23 KB | 0644 |
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hardirq.h | File | 1.28 KB | 0644 |
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hardwall.h | File | 1.08 KB | 0644 |
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highmem.h | File | 2.08 KB | 0644 |
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homecache.h | File | 4.21 KB | 0644 |
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hugetlb.h | File | 3.04 KB | 0644 |
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hv_driver.h | File | 1.92 KB | 0644 |
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ide.h | File | 758 B | 0644 |
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insn.h | File | 1.79 KB | 0644 |
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io.h | File | 12.43 KB | 0644 |
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irq.h | File | 3.11 KB | 0644 |
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irq_work.h | File | 283 B | 0644 |
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irqflags.h | File | 10.55 KB | 0644 |
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jump_label.h | File | 1.47 KB | 0644 |
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kdebug.h | File | 769 B | 0644 |
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kexec.h | File | 2.23 KB | 0644 |
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kgdb.h | File | 1.99 KB | 0644 |
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kmap_types.h | File | 1.02 KB | 0644 |
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kprobes.h | File | 2.19 KB | 0644 |
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linkage.h | File | 1.46 KB | 0644 |
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mmu.h | File | 965 B | 0644 |
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mmu_context.h | File | 4.5 KB | 0644 |
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mmzone.h | File | 2.07 KB | 0644 |
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module.h | File | 1.12 KB | 0644 |
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page.h | File | 10.32 KB | 0644 |
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pci.h | File | 6.58 KB | 0644 |
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percpu.h | File | 1.79 KB | 0644 |
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perf_event.h | File | 766 B | 0644 |
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pgalloc.h | File | 4.76 KB | 0644 |
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pgtable.h | File | 15.66 KB | 0644 |
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pgtable_32.h | File | 4.08 KB | 0644 |
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pgtable_64.h | File | 5.11 KB | 0644 |
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pmc.h | File | 2.15 KB | 0644 |
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processor.h | File | 10.62 KB | 0644 |
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ptrace.h | File | 2.96 KB | 0644 |
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sections.h | File | 1.37 KB | 0644 |
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setup.h | File | 1.63 KB | 0644 |
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sigframe.h | File | 956 B | 0644 |
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signal.h | File | 1.07 KB | 0644 |
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smp.h | File | 3.98 KB | 0644 |
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spinlock.h | File | 741 B | 0644 |
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spinlock_32.h | File | 2.9 KB | 0644 |
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spinlock_64.h | File | 3.88 KB | 0644 |
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spinlock_types.h | File | 1.58 KB | 0644 |
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stack.h | File | 2.59 KB | 0644 |
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string.h | File | 1.19 KB | 0644 |
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switch_to.h | File | 2.75 KB | 0644 |
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syscall.h | File | 2.88 KB | 0644 |
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syscalls.h | File | 2.35 KB | 0644 |
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thread_info.h | File | 5.54 KB | 0644 |
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tile-desc.h | File | 650 B | 0644 |
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tile-desc_32.h | File | 12.54 KB | 0644 |
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tile-desc_64.h | File | 10.83 KB | 0644 |
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timex.h | File | 1.71 KB | 0644 |
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tlb.h | File | 878 B | 0644 |
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tlbflush.h | File | 3.99 KB | 0644 |
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topology.h | File | 1.52 KB | 0644 |
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traps.h | File | 2.44 KB | 0644 |
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uaccess.h | File | 12.77 KB | 0644 |
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unaligned.h | File | 1.56 KB | 0644 |
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unistd.h | File | 777 B | 0644 |
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user.h | File | 717 B | 0644 |
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vdso.h | File | 1.84 KB | 0644 |
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vga.h | File | 1.05 KB | 0644 |
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word-at-a-time.h | File | 1.07 KB | 0644 |
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