/* MN10300 Atomic counter operations * * Copyright (C) 2007 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 Licence * as published by the Free Software Foundation; either version * 2 of the Licence, or (at your option) any later version. */ #ifndef _ASM_ATOMIC_H #define _ASM_ATOMIC_H #include <asm/irqflags.h> #include <asm/cmpxchg.h> #include <asm/barrier.h> #ifndef CONFIG_SMP #include <asm-generic/atomic.h> #else /* * Atomic operations that C can't guarantee us. Useful for * resource counting etc.. */ #define ATOMIC_INIT(i) { (i) } #ifdef __KERNEL__ /** * atomic_read - read atomic variable * @v: pointer of type atomic_t * * Atomically reads the value of @v. Note that the guaranteed */ #define atomic_read(v) READ_ONCE((v)->counter) /** * atomic_set - set atomic variable * @v: pointer of type atomic_t * @i: required value * * Atomically sets the value of @v to @i. Note that the guaranteed */ #define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i)) #define ATOMIC_OP(op) \ static inline void atomic_##op(int i, atomic_t *v) \ { \ int retval, status; \ \ asm volatile( \ "1: mov %4,(_AAR,%3) \n" \ " mov (_ADR,%3),%1 \n" \ " " #op " %5,%1 \n" \ " mov %1,(_ADR,%3) \n" \ " mov (_ADR,%3),%0 \n" /* flush */ \ " mov (_ASR,%3),%0 \n" \ " or %0,%0 \n" \ " bne 1b \n" \ : "=&r"(status), "=&r"(retval), "=m"(v->counter) \ : "a"(ATOMIC_OPS_BASE_ADDR), "r"(&v->counter), "r"(i) \ : "memory", "cc"); \ } #define ATOMIC_OP_RETURN(op) \ static inline int atomic_##op##_return(int i, atomic_t *v) \ { \ int retval, status; \ \ asm volatile( \ "1: mov %4,(_AAR,%3) \n" \ " mov (_ADR,%3),%1 \n" \ " " #op " %5,%1 \n" \ " mov %1,(_ADR,%3) \n" \ " mov (_ADR,%3),%0 \n" /* flush */ \ " mov (_ASR,%3),%0 \n" \ " or %0,%0 \n" \ " bne 1b \n" \ : "=&r"(status), "=&r"(retval), "=m"(v->counter) \ : "a"(ATOMIC_OPS_BASE_ADDR), "r"(&v->counter), "r"(i) \ : "memory", "cc"); \ return retval; \ } #define ATOMIC_FETCH_OP(op) \ static inline int atomic_fetch_##op(int i, atomic_t *v) \ { \ int retval, status; \ \ asm volatile( \ "1: mov %4,(_AAR,%3) \n" \ " mov (_ADR,%3),%1 \n" \ " mov %1,%0 \n" \ " " #op " %5,%0 \n" \ " mov %0,(_ADR,%3) \n" \ " mov (_ADR,%3),%0 \n" /* flush */ \ " mov (_ASR,%3),%0 \n" \ " or %0,%0 \n" \ " bne 1b \n" \ : "=&r"(status), "=&r"(retval), "=m"(v->counter) \ : "a"(ATOMIC_OPS_BASE_ADDR), "r"(&v->counter), "r"(i) \ : "memory", "cc"); \ return retval; \ } #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op) ATOMIC_OPS(add) ATOMIC_OPS(sub) #undef ATOMIC_OPS #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op) ATOMIC_OPS(and) ATOMIC_OPS(or) ATOMIC_OPS(xor) #undef ATOMIC_OPS #undef ATOMIC_FETCH_OP #undef ATOMIC_OP_RETURN #undef ATOMIC_OP 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_add_return(1, v); } static inline void atomic_dec(atomic_t *v) { atomic_sub_return(1, v); } #define atomic_dec_return(v) atomic_sub_return(1, (v)) #define atomic_inc_return(v) atomic_add_return(1, (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) #define __atomic_add_unless(v, a, u) \ ({ \ int c, old; \ c = atomic_read(v); \ while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \ c = old; \ c; \ }) #define atomic_xchg(ptr, v) (xchg(&(ptr)->counter, (v))) #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), (old), (new))) #endif /* __KERNEL__ */ #endif /* CONFIG_SMP */ #endif /* _ASM_ATOMIC_H */
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asm-offsets.h | File | 35 B | 0644 |
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atomic.h | File | 4.02 KB | 0644 |
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bitops.h | File | 5.42 KB | 0644 |
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bug.h | File | 864 B | 0644 |
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bugs.h | File | 561 B | 0644 |
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busctl-regs.h | File | 7.8 KB | 0644 |
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cache.h | File | 2.06 KB | 0644 |
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cacheflush.h | File | 7.6 KB | 0644 |
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checksum.h | File | 2.09 KB | 0644 |
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cmpxchg.h | File | 2.65 KB | 0644 |
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cpu-regs.h | File | 16.61 KB | 0644 |
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current.h | File | 922 B | 0644 |
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debugger.h | File | 1.2 KB | 0644 |
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delay.h | File | 597 B | 0644 |
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div64.h | File | 3.21 KB | 0644 |
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dma-mapping.h | File | 636 B | 0644 |
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dma.h | File | 3.09 KB | 0644 |
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dmactl-regs.h | File | 532 B | 0644 |
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elf.h | File | 4.49 KB | 0644 |
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emergency-restart.h | File | 43 B | 0644 |
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exceptions.h | File | 4.74 KB | 0644 |
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fpu.h | File | 3.57 KB | 0644 |
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frame.inc | File | 2.37 KB | 0644 |
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ftrace.h | File | 12 B | 0644 |
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futex.h | File | 31 B | 0644 |
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gdb-stub.h | File | 5.42 KB | 0644 |
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hardirq.h | File | 1.68 KB | 0644 |
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highmem.h | File | 3.01 KB | 0644 |
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hw_irq.h | File | 483 B | 0644 |
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intctl-regs.h | File | 2.26 KB | 0644 |
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io.h | File | 7.67 KB | 0644 |
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irq.h | File | 1.11 KB | 0644 |
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irq_regs.h | File | 751 B | 0644 |
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irqflags.h | File | 4.05 KB | 0644 |
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kdebug.h | File | 561 B | 0644 |
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kgdb.h | File | 1.7 KB | 0644 |
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kmap_types.h | File | 160 B | 0644 |
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kprobes.h | File | 1.59 KB | 0644 |
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linkage.h | File | 593 B | 0644 |
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local.h | File | 31 B | 0644 |
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local64.h | File | 33 B | 0644 |
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mc146818rtc.h | File | 26 B | 0644 |
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mmu.h | File | 434 B | 0644 |
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mmu_context.h | File | 4.44 KB | 0644 |
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module.h | File | 677 B | 0644 |
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nmi.h | File | 500 B | 0644 |
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page.h | File | 3.63 KB | 0644 |
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page_offset.h | File | 302 B | 0644 |
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pci.h | File | 2.17 KB | 0644 |
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percpu.h | File | 32 B | 0644 |
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pgalloc.h | File | 1.49 KB | 0644 |
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pgtable.h | File | 15.68 KB | 0644 |
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pio-regs.h | File | 7.53 KB | 0644 |
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processor.h | File | 4.12 KB | 0644 |
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ptrace.h | File | 805 B | 0644 |
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reset-regs.h | File | 1.8 KB | 0644 |
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rtc-regs.h | File | 3.57 KB | 0644 |
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rtc.h | File | 692 B | 0644 |
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rwlock.h | File | 2.98 KB | 0644 |
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serial-regs.h | File | 8.85 KB | 0644 |
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serial.h | File | 1.02 KB | 0644 |
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setup.h | File | 574 B | 0644 |
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shmparam.h | File | 182 B | 0644 |
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signal.h | File | 888 B | 0644 |
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smp.h | File | 3.06 KB | 0644 |
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smsc911x.h | File | 27 B | 0644 |
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spinlock.h | File | 3.84 KB | 0644 |
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spinlock_types.h | File | 445 B | 0644 |
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string.h | File | 1.03 KB | 0644 |
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switch_to.h | File | 1.49 KB | 0644 |
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syscall.h | File | 2.38 KB | 0644 |
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termios.h | File | 387 B | 0644 |
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thread_info.h | File | 4.36 KB | 0644 |
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timer-regs.h | File | 20.72 KB | 0644 |
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timex.h | File | 843 B | 0644 |
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tlb.h | File | 941 B | 0644 |
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tlbflush.h | File | 3.45 KB | 0644 |
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topology.h | File | 34 B | 0644 |
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types.h | File | 620 B | 0644 |
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uaccess.h | File | 7.78 KB | 0644 |
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ucontext.h | File | 673 B | 0644 |
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unaligned.h | File | 678 B | 0644 |
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unistd.h | File | 1.34 KB | 0644 |
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user.h | File | 1.91 KB | 0644 |
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vga.h | File | 471 B | 0644 |
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xor.h | File | 29 B | 0644 |
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