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On m32r, use the new cmpxchg_local as primitive for the local_cmpxchg operation. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Acked-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
366 lines
8.8 KiB
C
366 lines
8.8 KiB
C
#ifndef __M32R_LOCAL_H
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#define __M32R_LOCAL_H
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/*
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* linux/include/asm-m32r/local.h
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*
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* M32R version:
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* Copyright (C) 2001, 2002 Hitoshi Yamamoto
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* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
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* Copyright (C) 2007 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
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*/
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#include <linux/percpu.h>
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#include <asm/assembler.h>
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#include <asm/system.h>
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#include <asm/local.h>
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/*
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* Atomic operations that C can't guarantee us. Useful for
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* resource counting etc..
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*/
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/*
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* Make sure gcc doesn't try to be clever and move things around
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* on us. We need to use _exactly_ the address the user gave us,
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* not some alias that contains the same information.
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*/
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typedef struct { volatile int counter; } local_t;
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#define LOCAL_INIT(i) { (i) }
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/**
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* local_read - read local variable
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* @l: pointer of type local_t
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*
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* Atomically reads the value of @l.
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*/
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#define local_read(l) ((l)->counter)
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/**
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* local_set - set local variable
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* @l: pointer of type local_t
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* @i: required value
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*
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* Atomically sets the value of @l to @i.
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*/
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#define local_set(l, i) (((l)->counter) = (i))
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/**
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* local_add_return - add long to local variable and return it
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* @i: long value to add
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* @l: pointer of type local_t
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*
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* Atomically adds @i to @l and return (@i + @l).
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*/
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static inline long local_add_return(long i, local_t *l)
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{
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unsigned long flags;
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long result;
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local_irq_save(flags);
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__asm__ __volatile__ (
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"# local_add_return \n\t"
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DCACHE_CLEAR("%0", "r4", "%1")
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"ld %0, @%1; \n\t"
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"add %0, %2; \n\t"
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"st %0, @%1; \n\t"
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: "=&r" (result)
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: "r" (&l->counter), "r" (i)
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: "memory"
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#ifdef CONFIG_CHIP_M32700_TS1
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, "r4"
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#endif /* CONFIG_CHIP_M32700_TS1 */
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);
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local_irq_restore(flags);
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return result;
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}
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/**
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* local_sub_return - subtract long from local variable and return it
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* @i: long value to subtract
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* @l: pointer of type local_t
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*
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* Atomically subtracts @i from @l and return (@l - @i).
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*/
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static inline long local_sub_return(long i, local_t *l)
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{
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unsigned long flags;
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long result;
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local_irq_save(flags);
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__asm__ __volatile__ (
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"# local_sub_return \n\t"
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DCACHE_CLEAR("%0", "r4", "%1")
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"ld %0, @%1; \n\t"
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"sub %0, %2; \n\t"
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"st %0, @%1; \n\t"
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: "=&r" (result)
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: "r" (&l->counter), "r" (i)
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: "memory"
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#ifdef CONFIG_CHIP_M32700_TS1
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, "r4"
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#endif /* CONFIG_CHIP_M32700_TS1 */
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);
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local_irq_restore(flags);
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return result;
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}
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/**
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* local_add - add long to local variable
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* @i: long value to add
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* @l: pointer of type local_t
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*
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* Atomically adds @i to @l.
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*/
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#define local_add(i, l) ((void) local_add_return((i), (l)))
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/**
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* local_sub - subtract the local variable
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* @i: long value to subtract
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* @l: pointer of type local_t
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*
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* Atomically subtracts @i from @l.
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*/
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#define local_sub(i, l) ((void) local_sub_return((i), (l)))
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/**
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* local_sub_and_test - subtract value from variable and test result
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* @i: integer value to subtract
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* @l: pointer of type local_t
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*
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* Atomically subtracts @i from @l and returns
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* true if the result is zero, or false for all
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* other cases.
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*/
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#define local_sub_and_test(i, l) (local_sub_return((i), (l)) == 0)
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/**
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* local_inc_return - increment local variable and return it
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* @l: pointer of type local_t
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*
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* Atomically increments @l by 1 and returns the result.
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*/
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static inline long local_inc_return(local_t *l)
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{
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unsigned long flags;
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long result;
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local_irq_save(flags);
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__asm__ __volatile__ (
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"# local_inc_return \n\t"
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DCACHE_CLEAR("%0", "r4", "%1")
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"ld %0, @%1; \n\t"
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"addi %0, #1; \n\t"
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"st %0, @%1; \n\t"
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: "=&r" (result)
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: "r" (&l->counter)
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: "memory"
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#ifdef CONFIG_CHIP_M32700_TS1
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, "r4"
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#endif /* CONFIG_CHIP_M32700_TS1 */
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);
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local_irq_restore(flags);
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return result;
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}
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/**
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* local_dec_return - decrement local variable and return it
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* @l: pointer of type local_t
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*
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* Atomically decrements @l by 1 and returns the result.
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*/
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static inline long local_dec_return(local_t *l)
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{
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unsigned long flags;
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long result;
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local_irq_save(flags);
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__asm__ __volatile__ (
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"# local_dec_return \n\t"
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DCACHE_CLEAR("%0", "r4", "%1")
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"ld %0, @%1; \n\t"
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"addi %0, #-1; \n\t"
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"st %0, @%1; \n\t"
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: "=&r" (result)
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: "r" (&l->counter)
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: "memory"
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#ifdef CONFIG_CHIP_M32700_TS1
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, "r4"
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#endif /* CONFIG_CHIP_M32700_TS1 */
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);
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local_irq_restore(flags);
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return result;
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}
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/**
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* local_inc - increment local variable
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* @l: pointer of type local_t
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*
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* Atomically increments @l by 1.
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*/
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#define local_inc(l) ((void)local_inc_return(l))
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/**
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* local_dec - decrement local variable
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* @l: pointer of type local_t
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*
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* Atomically decrements @l by 1.
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*/
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#define local_dec(l) ((void)local_dec_return(l))
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/**
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* local_inc_and_test - increment and test
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* @l: pointer of type local_t
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*
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* Atomically increments @l by 1
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* and returns true if the result is zero, or false for all
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* other cases.
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*/
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#define local_inc_and_test(l) (local_inc_return(l) == 0)
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/**
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* local_dec_and_test - decrement and test
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* @l: pointer of type local_t
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*
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* Atomically decrements @l by 1 and
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* returns true if the result is 0, or false for all
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* other cases.
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*/
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#define local_dec_and_test(l) (local_dec_return(l) == 0)
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/**
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* local_add_negative - add and test if negative
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* @l: pointer of type local_t
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* @i: integer value to add
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*
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* Atomically adds @i to @l and returns true
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* if the result is negative, or false when
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* result is greater than or equal to zero.
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*/
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#define local_add_negative(i, l) (local_add_return((i), (l)) < 0)
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#define local_cmpxchg(l, o, n) (cmpxchg_local(&((l)->counter), (o), (n)))
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#define local_xchg(v, new) (xchg_local(&((l)->counter), new))
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/**
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* local_add_unless - add unless the number is a given value
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* @l: pointer of type local_t
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* @a: the amount to add to l...
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* @u: ...unless l is equal to u.
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*
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* Atomically adds @a to @l, so long as it was not @u.
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* Returns non-zero if @l was not @u, and zero otherwise.
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*/
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static inline int local_add_unless(local_t *l, long a, long u)
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{
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long c, old;
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c = local_read(l);
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for (;;) {
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if (unlikely(c == (u)))
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break;
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old = local_cmpxchg((l), c, c + (a));
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if (likely(old == c))
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break;
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c = old;
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}
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return c != (u);
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}
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#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
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static inline void local_clear_mask(unsigned long mask, local_t *addr)
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{
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unsigned long flags;
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unsigned long tmp;
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local_irq_save(flags);
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__asm__ __volatile__ (
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"# local_clear_mask \n\t"
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DCACHE_CLEAR("%0", "r5", "%1")
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"ld %0, @%1; \n\t"
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"and %0, %2; \n\t"
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"st %0, @%1; \n\t"
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: "=&r" (tmp)
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: "r" (addr), "r" (~mask)
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: "memory"
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#ifdef CONFIG_CHIP_M32700_TS1
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, "r5"
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#endif /* CONFIG_CHIP_M32700_TS1 */
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);
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local_irq_restore(flags);
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}
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static inline void local_set_mask(unsigned long mask, local_t *addr)
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{
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unsigned long flags;
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unsigned long tmp;
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local_irq_save(flags);
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__asm__ __volatile__ (
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"# local_set_mask \n\t"
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DCACHE_CLEAR("%0", "r5", "%1")
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"ld %0, @%1; \n\t"
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"or %0, %2; \n\t"
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"st %0, @%1; \n\t"
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: "=&r" (tmp)
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: "r" (addr), "r" (mask)
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: "memory"
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#ifdef CONFIG_CHIP_M32700_TS1
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, "r5"
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#endif /* CONFIG_CHIP_M32700_TS1 */
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);
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local_irq_restore(flags);
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}
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/* Atomic operations are already serializing on m32r */
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#define smp_mb__before_local_dec() barrier()
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#define smp_mb__after_local_dec() barrier()
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#define smp_mb__before_local_inc() barrier()
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#define smp_mb__after_local_inc() barrier()
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/* Use these for per-cpu local_t variables: on some archs they are
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* much more efficient than these naive implementations. Note they take
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* a variable, not an address.
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*/
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#define __local_inc(l) ((l)->a.counter++)
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#define __local_dec(l) ((l)->a.counter++)
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#define __local_add(i, l) ((l)->a.counter += (i))
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#define __local_sub(i, l) ((l)->a.counter -= (i))
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/* Use these for per-cpu local_t variables: on some archs they are
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* much more efficient than these naive implementations. Note they take
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* a variable, not an address.
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*/
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/* Need to disable preemption for the cpu local counters otherwise we could
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still access a variable of a previous CPU in a non local way. */
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#define cpu_local_wrap_v(l) \
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({ local_t res__; \
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preempt_disable(); \
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res__ = (l); \
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preempt_enable(); \
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res__; })
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#define cpu_local_wrap(l) \
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({ preempt_disable(); \
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l; \
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preempt_enable(); }) \
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#define cpu_local_read(l) cpu_local_wrap_v(local_read(&__get_cpu_var(l)))
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#define cpu_local_set(l, i) cpu_local_wrap(local_set(&__get_cpu_var(l), (i)))
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#define cpu_local_inc(l) cpu_local_wrap(local_inc(&__get_cpu_var(l)))
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#define cpu_local_dec(l) cpu_local_wrap(local_dec(&__get_cpu_var(l)))
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#define cpu_local_add(i, l) cpu_local_wrap(local_add((i), &__get_cpu_var(l)))
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#define cpu_local_sub(i, l) cpu_local_wrap(local_sub((i), &__get_cpu_var(l)))
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#define __cpu_local_inc(l) cpu_local_inc(l)
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#define __cpu_local_dec(l) cpu_local_dec(l)
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#define __cpu_local_add(i, l) cpu_local_add((i), (l))
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#define __cpu_local_sub(i, l) cpu_local_sub((i), (l))
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#endif /* __M32R_LOCAL_H */
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