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| Current File : //usr/src/sys/arm/include/atomic.h |
/* $NetBSD: atomic.h,v 1.1 2002/10/19 12:22:34 bsh Exp $ */
/*-
* Copyright (C) 2003-2004 Olivier Houchard
* Copyright (C) 1994-1997 Mark Brinicombe
* Copyright (C) 1994 Brini
* All rights reserved.
*
* This code is derived from software written for Brini by Mark Brinicombe
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Brini.
* 4. The name of Brini may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL BRINI BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD: release/9.1.0/sys/arm/include/atomic.h 190603 2009-03-31 23:47:18Z cognet $
*/
#ifndef _MACHINE_ATOMIC_H_
#define _MACHINE_ATOMIC_H_
#ifndef _LOCORE
#include <sys/types.h>
#ifndef _KERNEL
#include <machine/sysarch.h>
#endif
#define mb()
#define wmb()
#define rmb()
#ifndef I32_bit
#define I32_bit (1 << 7) /* IRQ disable */
#endif
#ifndef F32_bit
#define F32_bit (1 << 6) /* FIQ disable */
#endif
#define __with_interrupts_disabled(expr) \
do { \
u_int cpsr_save, tmp; \
\
__asm __volatile( \
"mrs %0, cpsr;" \
"orr %1, %0, %2;" \
"msr cpsr_all, %1;" \
: "=r" (cpsr_save), "=r" (tmp) \
: "I" (I32_bit | F32_bit) \
: "cc" ); \
(expr); \
__asm __volatile( \
"msr cpsr_all, %0" \
: /* no output */ \
: "r" (cpsr_save) \
: "cc" ); \
} while(0)
static __inline uint32_t
__swp(uint32_t val, volatile uint32_t *ptr)
{
__asm __volatile("swp %0, %2, [%3]"
: "=&r" (val), "=m" (*ptr)
: "r" (val), "r" (ptr), "m" (*ptr)
: "memory");
return (val);
}
#ifdef _KERNEL
static __inline void
atomic_set_32(volatile uint32_t *address, uint32_t setmask)
{
__with_interrupts_disabled(*address |= setmask);
}
static __inline void
atomic_clear_32(volatile uint32_t *address, uint32_t clearmask)
{
__with_interrupts_disabled(*address &= ~clearmask);
}
static __inline u_int32_t
atomic_cmpset_32(volatile u_int32_t *p, volatile u_int32_t cmpval, volatile u_int32_t newval)
{
int ret;
__with_interrupts_disabled(
{
if (*p == cmpval) {
*p = newval;
ret = 1;
} else {
ret = 0;
}
});
return (ret);
}
static __inline void
atomic_add_32(volatile u_int32_t *p, u_int32_t val)
{
__with_interrupts_disabled(*p += val);
}
static __inline void
atomic_subtract_32(volatile u_int32_t *p, u_int32_t val)
{
__with_interrupts_disabled(*p -= val);
}
static __inline uint32_t
atomic_fetchadd_32(volatile uint32_t *p, uint32_t v)
{
uint32_t value;
__with_interrupts_disabled(
{
value = *p;
*p += v;
});
return (value);
}
#else /* !_KERNEL */
static __inline u_int32_t
atomic_cmpset_32(volatile u_int32_t *p, volatile u_int32_t cmpval, volatile u_int32_t newval)
{
register int done, ras_start = ARM_RAS_START;
__asm __volatile("1:\n"
"adr %1, 1b\n"
"str %1, [%0]\n"
"adr %1, 2f\n"
"str %1, [%0, #4]\n"
"ldr %1, [%2]\n"
"cmp %1, %3\n"
"streq %4, [%2]\n"
"2:\n"
"mov %1, #0\n"
"str %1, [%0]\n"
"mov %1, #0xffffffff\n"
"str %1, [%0, #4]\n"
"moveq %1, #1\n"
"movne %1, #0\n"
: "+r" (ras_start), "=r" (done)
,"+r" (p), "+r" (cmpval), "+r" (newval) : : "memory");
return (done);
}
static __inline void
atomic_add_32(volatile u_int32_t *p, u_int32_t val)
{
int start, ras_start = ARM_RAS_START;
__asm __volatile("1:\n"
"adr %1, 1b\n"
"str %1, [%0]\n"
"adr %1, 2f\n"
"str %1, [%0, #4]\n"
"ldr %1, [%2]\n"
"add %1, %1, %3\n"
"str %1, [%2]\n"
"2:\n"
"mov %1, #0\n"
"str %1, [%0]\n"
"mov %1, #0xffffffff\n"
"str %1, [%0, #4]\n"
: "+r" (ras_start), "=r" (start), "+r" (p), "+r" (val)
: : "memory");
}
static __inline void
atomic_subtract_32(volatile u_int32_t *p, u_int32_t val)
{
int start, ras_start = ARM_RAS_START;
__asm __volatile("1:\n"
"adr %1, 1b\n"
"str %1, [%0]\n"
"adr %1, 2f\n"
"str %1, [%0, #4]\n"
"ldr %1, [%2]\n"
"sub %1, %1, %3\n"
"str %1, [%2]\n"
"2:\n"
"mov %1, #0\n"
"str %1, [%0]\n"
"mov %1, #0xffffffff\n"
"str %1, [%0, #4]\n"
: "+r" (ras_start), "=r" (start), "+r" (p), "+r" (val)
: : "memory");
}
static __inline void
atomic_set_32(volatile uint32_t *address, uint32_t setmask)
{
int start, ras_start = ARM_RAS_START;
__asm __volatile("1:\n"
"adr %1, 1b\n"
"str %1, [%0]\n"
"adr %1, 2f\n"
"str %1, [%0, #4]\n"
"ldr %1, [%2]\n"
"orr %1, %1, %3\n"
"str %1, [%2]\n"
"2:\n"
"mov %1, #0\n"
"str %1, [%0]\n"
"mov %1, #0xffffffff\n"
"str %1, [%0, #4]\n"
: "+r" (ras_start), "=r" (start), "+r" (address), "+r" (setmask)
: : "memory");
}
static __inline void
atomic_clear_32(volatile uint32_t *address, uint32_t clearmask)
{
int start, ras_start = ARM_RAS_START;
__asm __volatile("1:\n"
"adr %1, 1b\n"
"str %1, [%0]\n"
"adr %1, 2f\n"
"str %1, [%0, #4]\n"
"ldr %1, [%2]\n"
"bic %1, %1, %3\n"
"str %1, [%2]\n"
"2:\n"
"mov %1, #0\n"
"str %1, [%0]\n"
"mov %1, #0xffffffff\n"
"str %1, [%0, #4]\n"
: "+r" (ras_start), "=r" (start), "+r" (address), "+r" (clearmask)
: : "memory");
}
static __inline uint32_t
atomic_fetchadd_32(volatile uint32_t *p, uint32_t v)
{
uint32_t start, tmp, ras_start = ARM_RAS_START;
__asm __volatile("1:\n"
"adr %1, 1b\n"
"str %1, [%0]\n"
"adr %1, 2f\n"
"str %1, [%0, #4]\n"
"ldr %1, [%3]\n"
"mov %2, %1\n"
"add %2, %2, %4\n"
"str %2, [%3]\n"
"2:\n"
"mov %2, #0\n"
"str %2, [%0]\n"
"mov %2, #0xffffffff\n"
"str %2, [%0, #4]\n"
: "+r" (ras_start), "=r" (start), "=r" (tmp), "+r" (p), "+r" (v)
: : "memory");
return (start);
}
#endif /* _KERNEL */
static __inline int
atomic_load_32(volatile uint32_t *v)
{
return (*v);
}
static __inline void
atomic_store_32(volatile uint32_t *dst, uint32_t src)
{
*dst = src;
}
static __inline uint32_t
atomic_readandclear_32(volatile u_int32_t *p)
{
return (__swp(0, p));
}
#undef __with_interrupts_disabled
#endif /* _LOCORE */
#define atomic_add_long(p, v) \
atomic_add_32((volatile u_int *)(p), (u_int)(v))
#define atomic_add_acq_long atomic_add_long
#define atomic_add_rel_long atomic_add_long
#define atomic_subtract_long(p, v) \
atomic_subtract_32((volatile u_int *)(p), (u_int)(v))
#define atomic_subtract_acq_long atomic_subtract_long
#define atomic_subtract_rel_long atomic_subtract_long
#define atomic_clear_long(p, v) \
atomic_clear_32((volatile u_int *)(p), (u_int)(v))
#define atomic_clear_acq_long atomic_clear_long
#define atomic_clear_rel_long atomic_clear_long
#define atomic_set_long(p, v) \
atomic_set_32((volatile u_int *)(p), (u_int)(v))
#define atomic_set_acq_long atomic_set_long
#define atomic_set_rel_long atomic_set_long
#define atomic_cmpset_long(dst, old, new) \
atomic_cmpset_32((volatile u_int *)(dst), (u_int)(old), (u_int)(new))
#define atomic_cmpset_acq_long atomic_cmpset_long
#define atomic_cmpset_rel_long atomic_cmpset_long
#define atomic_fetchadd_long(p, v) \
atomic_fetchadd_32((volatile u_int *)(p), (u_int)(v))
#define atomic_readandclear_long(p) \
atomic_readandclear_long((volatile u_int *)(p))
#define atomic_load_long(p) \
atomic_load_32((volatile u_int *)(p))
#define atomic_load_acq_long atomic_load_long
#define atomic_store_rel_long(p, v) \
atomic_store_rel_32((volatile u_int *)(p), (u_int)(v))
#define atomic_clear_ptr atomic_clear_32
#define atomic_set_ptr atomic_set_32
#define atomic_cmpset_ptr(dst, old, new) \
atomic_cmpset_32((volatile u_int *)(dst), (u_int)(old), (u_int)(new))
#define atomic_cmpset_rel_ptr atomic_cmpset_ptr
#define atomic_cmpset_acq_ptr atomic_cmpset_ptr
#define atomic_store_ptr atomic_store_32
#define atomic_store_rel_ptr atomic_store_ptr
#define atomic_add_int atomic_add_32
#define atomic_add_acq_int atomic_add_int
#define atomic_add_rel_int atomic_add_int
#define atomic_subtract_int atomic_subtract_32
#define atomic_subtract_acq_int atomic_subtract_int
#define atomic_subtract_rel_int atomic_subtract_int
#define atomic_clear_int atomic_clear_32
#define atomic_clear_acq_int atomic_clear_int
#define atomic_clear_rel_int atomic_clear_int
#define atomic_set_int atomic_set_32
#define atomic_set_acq_int atomic_set_int
#define atomic_set_rel_int atomic_set_int
#define atomic_cmpset_int atomic_cmpset_32
#define atomic_cmpset_acq_int atomic_cmpset_int
#define atomic_cmpset_rel_int atomic_cmpset_int
#define atomic_fetchadd_int atomic_fetchadd_32
#define atomic_readandclear_int atomic_readandclear_32
#define atomic_load_acq_int atomic_load_32
#define atomic_store_rel_int atomic_store_32
#define atomic_add_acq_32 atomic_add_32
#define atomic_add_rel_32 atomic_add_32
#define atomic_subtract_acq_32 atomic_subtract_32
#define atomic_subtract_rel_32 atomic_subtract_32
#define atomic_clear_acq_32 atomic_clear_32
#define atomic_clear_rel_32 atomic_clear_32
#define atomic_set_acq_32 atomic_set_32
#define atomic_set_rel_32 atomic_set_32
#define atomic_cmpset_acq_32 atomic_cmpset_32
#define atomic_cmpset_rel_32 atomic_cmpset_32
#define atomic_load_acq_32 atomic_load_32
#define atomic_store_rel_32 atomic_store_32
#endif /* _MACHINE_ATOMIC_H_ */