/* SPDX-License-Identifier: GPL-2.0 */ /* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org> * Copyright (C) 2006 Kyle McMartin <kyle@parisc-linux.org> */ #ifndef _ASM_PARISC_ATOMIC_H_ #define _ASM_PARISC_ATOMIC_H_ #include <linux/types.h> #include <asm/cmpxchg.h> #include <asm/barrier.h> /* * Atomic operations that C can't guarantee us. Useful for * resource counting etc.. * * And probably incredibly slow on parisc. OTOH, we don't * have to write any serious assembly. prumpf */ #ifdef CONFIG_SMP #include <asm/spinlock.h> #include <asm/cache.h> /* we use L1_CACHE_BYTES */ /* Use an array of spinlocks for our atomic_ts. * Hash function to index into a different SPINLOCK. * Since "a" is usually an address, use one spinlock per cacheline. */ # define ATOMIC_HASH_SIZE 4 # define ATOMIC_HASH(a) (&(__atomic_hash[ (((unsigned long) (a))/L1_CACHE_BYTES) & (ATOMIC_HASH_SIZE-1) ])) extern arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned; /* Can't use raw_spin_lock_irq because of #include problems, so * this is the substitute */ #define _atomic_spin_lock_irqsave(l,f) do { \ arch_spinlock_t *s = ATOMIC_HASH(l); \ local_irq_save(f); \ arch_spin_lock(s); \ } while(0) #define _atomic_spin_unlock_irqrestore(l,f) do { \ arch_spinlock_t *s = ATOMIC_HASH(l); \ arch_spin_unlock(s); \ local_irq_restore(f); \ } while(0) #else # define _atomic_spin_lock_irqsave(l,f) do { local_irq_save(f); } while (0) # define _atomic_spin_unlock_irqrestore(l,f) do { local_irq_restore(f); } while (0) #endif /* * Note that we need not lock read accesses - aligned word writes/reads * are atomic, so a reader never sees inconsistent values. */ static __inline__ void atomic_set(atomic_t *v, int i) { unsigned long flags; _atomic_spin_lock_irqsave(v, flags); v->counter = i; _atomic_spin_unlock_irqrestore(v, flags); } #define atomic_set_release(v, i) atomic_set((v), (i)) static __inline__ int atomic_read(const atomic_t *v) { return READ_ONCE((v)->counter); } /* exported interface */ #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) #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, 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; } #define ATOMIC_OP(op, c_op) \ static __inline__ void atomic_##op(int i, atomic_t *v) \ { \ unsigned long flags; \ \ _atomic_spin_lock_irqsave(v, flags); \ v->counter c_op i; \ _atomic_spin_unlock_irqrestore(v, flags); \ } \ #define ATOMIC_OP_RETURN(op, c_op) \ static __inline__ int atomic_##op##_return(int i, atomic_t *v) \ { \ unsigned long flags; \ int ret; \ \ _atomic_spin_lock_irqsave(v, flags); \ ret = (v->counter c_op i); \ _atomic_spin_unlock_irqrestore(v, flags); \ \ return ret; \ } #define ATOMIC_FETCH_OP(op, c_op) \ static __inline__ int atomic_fetch_##op(int i, atomic_t *v) \ { \ unsigned long flags; \ int ret; \ \ _atomic_spin_lock_irqsave(v, flags); \ ret = v->counter; \ v->counter c_op i; \ _atomic_spin_unlock_irqrestore(v, flags); \ \ return ret; \ } #define ATOMIC_OPS(op, c_op) \ ATOMIC_OP(op, c_op) \ ATOMIC_OP_RETURN(op, c_op) \ ATOMIC_FETCH_OP(op, c_op) ATOMIC_OPS(add, +=) ATOMIC_OPS(sub, -=) #undef ATOMIC_OPS #define ATOMIC_OPS(op, c_op) \ ATOMIC_OP(op, c_op) \ ATOMIC_FETCH_OP(op, c_op) ATOMIC_OPS(and, &=) ATOMIC_OPS(or, |=) ATOMIC_OPS(xor, ^=) #undef ATOMIC_OPS #undef ATOMIC_FETCH_OP #undef ATOMIC_OP_RETURN #undef ATOMIC_OP #define atomic_inc(v) (atomic_add( 1,(v))) #define atomic_dec(v) (atomic_add( -1,(v))) #define atomic_inc_return(v) (atomic_add_return( 1,(v))) #define atomic_dec_return(v) (atomic_add_return( -1,(v))) #define atomic_add_negative(a, v) (atomic_add_return((a), (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 zero, or false for all * other cases. */ #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0) #define atomic_sub_and_test(i,v) (atomic_sub_return((i),(v)) == 0) #define ATOMIC_INIT(i) { (i) } #ifdef CONFIG_64BIT #define ATOMIC64_INIT(i) { (i) } #define ATOMIC64_OP(op, c_op) \ static __inline__ void atomic64_##op(s64 i, atomic64_t *v) \ { \ unsigned long flags; \ \ _atomic_spin_lock_irqsave(v, flags); \ v->counter c_op i; \ _atomic_spin_unlock_irqrestore(v, flags); \ } \ #define ATOMIC64_OP_RETURN(op, c_op) \ static __inline__ s64 atomic64_##op##_return(s64 i, atomic64_t *v) \ { \ unsigned long flags; \ s64 ret; \ \ _atomic_spin_lock_irqsave(v, flags); \ ret = (v->counter c_op i); \ _atomic_spin_unlock_irqrestore(v, flags); \ \ return ret; \ } #define ATOMIC64_FETCH_OP(op, c_op) \ static __inline__ s64 atomic64_fetch_##op(s64 i, atomic64_t *v) \ { \ unsigned long flags; \ s64 ret; \ \ _atomic_spin_lock_irqsave(v, flags); \ ret = v->counter; \ v->counter c_op i; \ _atomic_spin_unlock_irqrestore(v, flags); \ \ return ret; \ } #define ATOMIC64_OPS(op, c_op) \ ATOMIC64_OP(op, c_op) \ ATOMIC64_OP_RETURN(op, c_op) \ ATOMIC64_FETCH_OP(op, c_op) ATOMIC64_OPS(add, +=) ATOMIC64_OPS(sub, -=) #undef ATOMIC64_OPS #define ATOMIC64_OPS(op, c_op) \ ATOMIC64_OP(op, c_op) \ ATOMIC64_FETCH_OP(op, c_op) ATOMIC64_OPS(and, &=) ATOMIC64_OPS(or, |=) ATOMIC64_OPS(xor, ^=) #undef ATOMIC64_OPS #undef ATOMIC64_FETCH_OP #undef ATOMIC64_OP_RETURN #undef ATOMIC64_OP static __inline__ void atomic64_set(atomic64_t *v, s64 i) { unsigned long flags; _atomic_spin_lock_irqsave(v, flags); v->counter = i; _atomic_spin_unlock_irqrestore(v, flags); } #define atomic64_set_release(v, i) atomic64_set((v), (i)) static __inline__ s64 atomic64_read(const atomic64_t *v) { return READ_ONCE((v)->counter); } #define atomic64_inc(v) (atomic64_add( 1,(v))) #define atomic64_dec(v) (atomic64_add( -1,(v))) #define atomic64_inc_return(v) (atomic64_add_return( 1,(v))) #define atomic64_dec_return(v) (atomic64_add_return( -1,(v))) #define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0) #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) #define atomic64_dec_and_test(v) (atomic64_dec_return(v) == 0) #define atomic64_sub_and_test(i,v) (atomic64_sub_return((i),(v)) == 0) /* exported interface */ #define atomic64_cmpxchg(v, o, n) \ ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n))) #define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) /** * 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 the old value of @v. */ static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u) { long c, old; c = atomic64_read(v); for (;;) { if (unlikely(c == (u))) break; old = atomic64_cmpxchg((v), c, c + (a)); if (likely(old == c)) break; c = old; } return c != (u); } #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) /* * 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 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 /* !CONFIG_64BIT */ #endif /* _ASM_PARISC_ATOMIC_H_ */
Name | Type | Size | Permission | Actions |
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Kbuild | File | 610 B | 0644 |
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agp.h | File | 596 B | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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asmregs.h | File | 3.04 KB | 0644 |
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assembly.h | File | 12.94 KB | 0644 |
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atomic.h | File | 8.24 KB | 0644 |
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barrier.h | File | 2.44 KB | 0644 |
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bitops.h | File | 5.89 KB | 0644 |
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bug.h | File | 2.35 KB | 0644 |
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bugs.h | File | 340 B | 0644 |
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cache.h | File | 1.59 KB | 0644 |
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cacheflush.h | File | 4.06 KB | 0644 |
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checksum.h | File | 5.48 KB | 0644 |
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cmpxchg.h | File | 3.62 KB | 0644 |
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compat.h | File | 6.52 KB | 0644 |
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compat_ucontext.h | File | 591 B | 0644 |
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delay.h | File | 533 B | 0644 |
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dma-mapping.h | File | 2.42 KB | 0644 |
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dma.h | File | 5.71 KB | 0644 |
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dwarf.h | File | 602 B | 0644 |
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eisa_bus.h | File | 702 B | 0644 |
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eisa_eeprom.h | File | 4.42 KB | 0644 |
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elf.h | File | 14.31 KB | 0644 |
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fb.h | File | 403 B | 0644 |
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fixmap.h | File | 1.15 KB | 0644 |
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floppy.h | File | 6.61 KB | 0644 |
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ftrace.h | File | 379 B | 0644 |
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futex.h | File | 2.66 KB | 0644 |
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grfioctl.h | File | 4.68 KB | 0644 |
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hardirq.h | File | 1.3 KB | 0644 |
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hardware.h | File | 4.1 KB | 0644 |
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hash.h | File | 5.07 KB | 0644 |
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hugetlb.h | File | 1.67 KB | 0644 |
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ide.h | File | 1.09 KB | 0644 |
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io.h | File | 8.14 KB | 0644 |
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irq.h | File | 1.23 KB | 0644 |
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irqflags.h | File | 1.02 KB | 0644 |
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kbdleds.h | File | 477 B | 0644 |
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kmap_types.h | File | 221 B | 0644 |
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ldcw.h | File | 2.15 KB | 0644 |
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led.h | File | 1.33 KB | 0644 |
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linkage.h | File | 759 B | 0644 |
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machdep.h | File | 349 B | 0644 |
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mckinley.h | File | 270 B | 0644 |
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mmu.h | File | 195 B | 0644 |
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mmu_context.h | File | 2.08 KB | 0644 |
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mmzone.h | File | 1.51 KB | 0644 |
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module.h | File | 527 B | 0644 |
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page.h | File | 5.42 KB | 0644 |
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parisc-device.h | File | 1.92 KB | 0644 |
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parport.h | File | 358 B | 0644 |
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pci.h | File | 6.57 KB | 0644 |
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pdc.h | File | 3.93 KB | 0644 |
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pdc_chassis.h | File | 15.06 KB | 0644 |
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pdcpat.h | File | 15 KB | 0644 |
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perf.h | File | 1.89 KB | 0644 |
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perf_event.h | File | 152 B | 0644 |
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pgalloc.h | File | 4.22 KB | 0644 |
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pgtable.h | File | 18.92 KB | 0644 |
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prefetch.h | File | 1.12 KB | 0644 |
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processor.h | File | 9.86 KB | 0644 |
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psw.h | File | 2.39 KB | 0644 |
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ptrace.h | File | 803 B | 0644 |
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ropes.h | File | 9.73 KB | 0644 |
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rt_sigframe.h | File | 745 B | 0644 |
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runway.h | File | 320 B | 0644 |
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sections.h | File | 283 B | 0644 |
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serial.h | File | 124 B | 0644 |
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shmparam.h | File | 263 B | 0644 |
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signal.h | File | 841 B | 0644 |
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smp.h | File | 1.25 KB | 0644 |
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socket.h | File | 311 B | 0644 |
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special_insns.h | File | 1015 B | 0644 |
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spinlock.h | File | 4.02 KB | 0644 |
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spinlock_types.h | File | 483 B | 0644 |
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string.h | File | 247 B | 0644 |
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superio.h | File | 3.25 KB | 0644 |
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switch_to.h | File | 332 B | 0644 |
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syscall.h | File | 1.4 KB | 0644 |
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termios.h | File | 1.72 KB | 0644 |
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thread_info.h | File | 3.15 KB | 0644 |
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timex.h | File | 372 B | 0644 |
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tlb.h | File | 672 B | 0644 |
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tlbflush.h | File | 2.63 KB | 0644 |
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topology.h | File | 900 B | 0644 |
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traps.h | File | 468 B | 0644 |
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uaccess.h | File | 6.55 KB | 0644 |
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ucontext.h | File | 327 B | 0644 |
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unaligned.h | File | 472 B | 0644 |
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unistd.h | File | 5.47 KB | 0644 |
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unwind.h | File | 2.56 KB | 0644 |
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