Skip to content
Snippets Groups Projects
Select Git revision
  • a1b81a84fff05dbfef45b7012c26e1fee9973e5d
  • seco_lf-6.6.52-2.2.1 default protected
  • seco_lf-6.6.52-2.2.1_d18-e83
  • seco_lf-6.6.52-2.2.1_d18-e71
  • seco_lf_v2024.04_6.6.52_2.2.x-d18-b79-tlv-note
  • integrate/gitlab-ci/cleaos-896-remane-parameters-for-clarity-3/into/seco_lf-5.10.y
  • integrate/gitlab-ci/cleaos-896-remane-parameters-for-clarity-3/into/seco_lf-6.6.52-2.2.1
  • integrate/gitlab-ci/cleaos-896-remane-parameters-for-clarity-2/into/seco_lf-6.6.52-2.2.1
  • integrate/gitlab-ci/cleaos-896-remane-parameters-for-clarity-1/into/seco_lf-6.6.52-2.2.1
  • integrate/gitlab-ci/cleaos-896-remane-parameters-for-clarity/into/seco_lf-6.6.52-2.2.1
  • seco_lf-6.6.52-2.2.1_mx8m-sscg
  • integrate/gitlab-ci/cleaos-913-add-retry-build-job-into-the-configuration/into/seco_lf-6.6.52-2.2.1
  • integrate/gitlab-ci/cleaos-913-add-retry-build-job-into-the-configuration/into/seco_lf-5.10.y
  • seco_lf-5.10.y protected
  • seco_lf_v2024.04_6.6.52_2.2.x-d18-sai
  • seco_lf-6.6.52-2.2.1_e88-lt9611uxc-i2s
  • seco_lf-6.6.52-2.2.1_d18-e71-dev
  • seco_lf-6.6.52-2.2.1_d18-dt-dto-elems
  • integrate/gitlab-ci/create-config-validation-json-schema/into/seco_lf-6.6.52-2.2.1
  • integrate/gitlab-ci/create-config-validation-json-schema/into/seco_lf-5.10.y
  • seco_lf-6.6.52-2.2.1_e88-e83-dev
  • lf-6.6.52-2.2.1
  • lf-6.1.55-2.2.1
  • lf-6.6.3-1.0.0
  • lf-6.6.3-imx95-er2
  • lf-6.1.55-2.2.0
  • lf-6.6.y-imx95-er1
  • lf-5.15.71-2.2.2
  • lf-6.1.36-2.1.0
  • lf-5.15.71-2.2.1
  • lf-6.1.22-2.0.0
  • lf-6.1.1-1.0.1
  • rel_imx_5.4.24_2.1.4
  • rel_imx_4.9.88_2.0.13
  • rel_imx_4.14.98_2.3.5
  • lf-6.1.1-1.0.0
  • rel_imx_5.4.3_2.0.2
  • lf-5.15.71-2.2.0
  • lf-5.10.72-2.2.3
  • lf-5.15.52-2.1.0
  • imx_5.15.52_imx8ulp_er1
41 results

atomic.h

Blame
  • Code owners
    Assign users and groups as approvers for specific file changes. Learn more.
    atomic.h 5.03 KiB
    /*
     * Atomic operations that C can't guarantee us.  Useful for
     * resource counting etc.
     *
     * But use these as seldom as possible since they are slower than
     * regular operations.
     *
     * Copyright (C) 2004-2006 Atmel Corporation
     *
     * This program is free software; you can redistribute it and/or modify
     * it under the terms of the GNU General Public License version 2 as
     * published by the Free Software Foundation.
     */
    #ifndef __ASM_AVR32_ATOMIC_H
    #define __ASM_AVR32_ATOMIC_H
    
    #include <asm/system.h>
    
    typedef struct { volatile int counter; } atomic_t;
    #define ATOMIC_INIT(i)  { (i) }
    
    #define atomic_read(v)		((v)->counter)
    #define atomic_set(v, i)	(((v)->counter) = i)
    
    /*
     * atomic_sub_return - subtract the atomic variable
     * @i: integer value to subtract
     * @v: pointer of type atomic_t
     *
     * Atomically subtracts @i from @v. Returns the resulting value.
     */
    static inline int atomic_sub_return(int i, atomic_t *v)
    {
    	int result;
    
    	asm volatile(
    		"/* atomic_sub_return */\n"
    		"1:	ssrf	5\n"
    		"	ld.w	%0, %2\n"
    		"	sub	%0, %3\n"
    		"	stcond	%1, %0\n"
    		"	brne	1b"
    		: "=&r"(result), "=o"(v->counter)
    		: "m"(v->counter), "rKs21"(i)
    		: "cc");
    
    	return result;
    }
    
    /*
     * atomic_add_return - add integer to atomic variable
     * @i: integer value to add
     * @v: pointer of type atomic_t
     *
     * Atomically adds @i to @v. Returns the resulting value.
     */
    static inline int atomic_add_return(int i, atomic_t *v)
    {
    	int result;
    
    	if (__builtin_constant_p(i) && (i >= -1048575) && (i <= 1048576))
    		result = atomic_sub_return(-i, v);
    	else
    		asm volatile(
    			"/* atomic_add_return */\n"
    			"1:	ssrf	5\n"
    			"	ld.w	%0, %1\n"
    			"	add	%0, %3\n"
    			"	stcond	%2, %0\n"
    			"	brne	1b"
    			: "=&r"(result), "=o"(v->counter)
    			: "m"(v->counter), "r"(i)
    			: "cc", "memory");
    
    	return result;
    }
    
    /*
     * atomic_sub_unless - sub 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.
     *
     * If the atomic value v is not equal to u, this function subtracts a
     * from v, and returns non zero. If v is equal to u then it returns
     * zero. This is done as an atomic operation.
    */
    static inline int atomic_sub_unless(atomic_t *v, int a, int u)
    {
    	int tmp, result = 0;
    
    	asm volatile(
    		"/* atomic_sub_unless */\n"
    		"1:	ssrf	5\n"
    		"	ld.w	%0, %3\n"
    		"	cp.w	%0, %5\n"
    		"	breq	1f\n"
    		"	sub	%0, %4\n"
    		"	stcond	%2, %0\n"
    		"	brne	1b\n"
    		"	mov	%1, 1\n"
    		"1:"
    		: "=&r"(tmp), "=&r"(result), "=o"(v->counter)
    		: "m"(v->counter), "rKs21"(a), "rKs21"(u), "1"(result)
    		: "cc", "memory");
    
    	return result;
    }
    
    /*
     * 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.
     *
     * If the atomic value v is not equal to u, this function adds a to v,
     * and returns non zero. If v is equal to u then it returns zero. This
     * is done as an atomic operation.
    */
    static inline int atomic_add_unless(atomic_t *v, int a, int u)
    {
    	int tmp, result;
    
    	if (__builtin_constant_p(a) && (a >= -1048575) && (a <= 1048576))
    		result = atomic_sub_unless(v, -a, u);
    	else {
    		result = 0;
    		asm volatile(
    			"/* atomic_add_unless */\n"
    			"1:	ssrf	5\n"
    			"	ld.w	%0, %3\n"
    			"	cp.w	%0, %5\n"
    			"	breq	1f\n"
    			"	add	%0, %4\n"
    			"	stcond	%2, %0\n"
    			"	brne	1b\n"
    			"	mov	%1, 1\n"
    			"1:"
    			: "=&r"(tmp), "=&r"(result), "=o"(v->counter)
    			: "m"(v->counter), "r"(a), "ir"(u), "1"(result)
    			: "cc", "memory");
    	}
    
    	return result;
    }
    
    /*
     * atomic_sub_if_positive - conditionally subtract integer from atomic variable
     * @i: integer value to subtract
     * @v: pointer of type atomic_t
     *
     * Atomically test @v and subtract @i if @v is greater or equal than @i.
     * The function returns the old value of @v minus @i.
     */
    static inline int atomic_sub_if_positive(int i, atomic_t *v)
    {
    	int result;
    
    	asm volatile(
    		"/* atomic_sub_if_positive */\n"
    		"1:	ssrf	5\n"
    		"	ld.w	%0, %2\n"
    		"	sub	%0, %3\n"
    		"	brlt	1f\n"
    		"	stcond	%1, %0\n"
    		"	brne	1b\n"
    		"1:"
    		: "=&r"(result), "=o"(v->counter)
    		: "m"(v->counter), "ir"(i)
    		: "cc", "memory");
    
    	return result;
    }
    
    #define atomic_xchg(v, new)	(xchg(&((v)->counter), new))
    #define atomic_cmpxchg(v, o, n)	(cmpxchg(&((v)->counter), (o), (n)))
    
    #define atomic_sub(i, v)	(void)atomic_sub_return(i, v)
    #define atomic_add(i, v)	(void)atomic_add_return(i, v)
    #define atomic_dec(v)		atomic_sub(1, (v))
    #define atomic_inc(v)		atomic_add(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_inc_and_test(v) (atomic_add_return(1, v) == 0)
    #define atomic_dec_and_test(v) (atomic_sub_return(1, v) == 0)
    #define atomic_add_negative(i, v) (atomic_add_return(i, v) < 0)
    
    #define atomic_inc_not_zero(v)	atomic_add_unless(v, 1, 0)
    #define atomic_dec_if_positive(v) atomic_sub_if_positive(1, v)
    
    #define smp_mb__before_atomic_dec()	barrier()
    #define smp_mb__after_atomic_dec()	barrier()
    #define smp_mb__before_atomic_inc()	barrier()
    #define smp_mb__after_atomic_inc()	barrier()
    
    #include <asm-generic/atomic.h>
    
    #endif /*  __ASM_AVR32_ATOMIC_H */