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/***********************license start***************
* Copyright (c) 2003-2010 Cavium Networks (support@cavium.com). All rights
* reserved.
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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.
* * Neither the name of Cavium Networks nor the names of
* its contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
* This Software, including technical data, may be subject to U.S. export control
* laws, including the U.S. Export Administration Act and its associated
* regulations, and may be subject to export or import regulations in other
* countries.
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
* AND WITH ALL FAULTS AND CAVIUM NETWORKS MAKES NO PROMISES, REPRESENTATIONS OR
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* CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK ARISING OUT OF USE OR
* PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
***********************license end**************************************/
/**
* @file
*
* This file provides atomic operations
*
* <hr>$Revision: 49448 $<hr>
*
*
*/
#ifndef __CVMX_ATOMIC_H__
#define __CVMX_ATOMIC_H__
#ifdef __cplusplus
extern "C" {
#endif
/**
* Atomically adds a signed value to a 32 bit (aligned) memory location.
*
* This version does not perform 'sync' operations to enforce memory
* operations. This should only be used when there are no memory operation
* ordering constraints. (This should NOT be used for reference counting -
* use the standard version instead.)
*
* @param ptr address in memory to add incr to
* @param incr amount to increment memory location by (signed)
*/
static inline void cvmx_atomic_add32_nosync(int32_t *ptr, int32_t incr)
{
if (OCTEON_IS_MODEL(OCTEON_CN3XXX))
{
uint32_t tmp;
__asm__ __volatile__(
".set noreorder \n"
"1: ll %[tmp], %[val] \n"
" addu %[tmp], %[inc] \n"
" sc %[tmp], %[val] \n"
" beqz %[tmp], 1b \n"
" nop \n"
".set reorder \n"
: [val] "+m" (*ptr), [tmp] "=&r" (tmp)
: [inc] "r" (incr)
: "memory");
}
else
{
__asm__ __volatile__(
" saa %[inc], (%[base]) \n"
: "+m" (*ptr)
: [inc] "r" (incr), [base] "r" (ptr)
: "memory");
}
}
/**
* Atomically adds a signed value to a 32 bit (aligned) memory location.
*
* Memory access ordering is enforced before/after the atomic operation,
* so no additional 'sync' instructions are required.
*
*
* @param ptr address in memory to add incr to
* @param incr amount to increment memory location by (signed)
*/
static inline void cvmx_atomic_add32(int32_t *ptr, int32_t incr)
{
CVMX_SYNCWS;
cvmx_atomic_add32_nosync(ptr, incr);
CVMX_SYNCWS;
}
/**
* Atomically sets a 32 bit (aligned) memory location to a value
*
* @param ptr address of memory to set
* @param value value to set memory location to.
*/
static inline void cvmx_atomic_set32(int32_t *ptr, int32_t value)
{
CVMX_SYNCWS;
*ptr = value;
CVMX_SYNCWS;
}
/**
* Returns the current value of a 32 bit (aligned) memory
* location.
*
* @param ptr Address of memory to get
* @return Value of the memory
*/
static inline int32_t cvmx_atomic_get32(int32_t *ptr)
{
return *(volatile int32_t *)ptr;
}
/**
* Atomically adds a signed value to a 64 bit (aligned) memory location.
*
* This version does not perform 'sync' operations to enforce memory
* operations. This should only be used when there are no memory operation
* ordering constraints. (This should NOT be used for reference counting -
* use the standard version instead.)
*
* @param ptr address in memory to add incr to
* @param incr amount to increment memory location by (signed)
*/
static inline void cvmx_atomic_add64_nosync(int64_t *ptr, int64_t incr)
{
if (OCTEON_IS_MODEL(OCTEON_CN3XXX))
{
uint64_t tmp;
__asm__ __volatile__(
".set noreorder \n"
"1: lld %[tmp], %[val] \n"
" daddu %[tmp], %[inc] \n"
" scd %[tmp], %[val] \n"
" beqz %[tmp], 1b \n"
" nop \n"
".set reorder \n"
: [val] "+m" (*ptr), [tmp] "=&r" (tmp)
: [inc] "r" (incr)
: "memory");
}
else
{
__asm__ __volatile__(
" saad %[inc], (%[base]) \n"
: "+m" (*ptr)
: [inc] "r" (incr), [base] "r" (ptr)
: "memory");
}
}
/**
* Atomically adds a signed value to a 64 bit (aligned) memory location.
*
* Memory access ordering is enforced before/after the atomic operation,
* so no additional 'sync' instructions are required.
*
*
* @param ptr address in memory to add incr to
* @param incr amount to increment memory location by (signed)
*/
static inline void cvmx_atomic_add64(int64_t *ptr, int64_t incr)
{
CVMX_SYNCWS;
cvmx_atomic_add64_nosync(ptr, incr);
CVMX_SYNCWS;
}
/**
* Atomically sets a 64 bit (aligned) memory location to a value
*
* @param ptr address of memory to set
* @param value value to set memory location to.
*/
static inline void cvmx_atomic_set64(int64_t *ptr, int64_t value)
{
CVMX_SYNCWS;
*ptr = value;
CVMX_SYNCWS;
}
/**
* Returns the current value of a 64 bit (aligned) memory
* location.
*
* @param ptr Address of memory to get
* @return Value of the memory
*/
static inline int64_t cvmx_atomic_get64(int64_t *ptr)
{
return *(volatile int64_t *)ptr;
}
/**
* Atomically compares the old value with the value at ptr, and if they match,
* stores new_val to ptr.
* If *ptr and old don't match, function returns failure immediately.
* If *ptr and old match, function spins until *ptr updated to new atomically, or
* until *ptr and old no longer match
*
* Does no memory synchronization.
*
* @return 1 on success (match and store)
* 0 on no match
*/
static inline uint32_t cvmx_atomic_compare_and_store32_nosync(uint32_t *ptr, uint32_t old_val, uint32_t new_val)
{
uint32_t tmp, ret;
__asm__ __volatile__(
".set noreorder \n"
"1: ll %[tmp], %[val] \n"
" li %[ret], 0 \n"
" bne %[tmp], %[old], 2f \n"
" move %[tmp], %[new_val] \n"
" sc %[tmp], %[val] \n"
" beqz %[tmp], 1b \n"
" li %[ret], 1 \n"
"2: nop \n"
".set reorder \n"
: [val] "+m" (*ptr), [tmp] "=&r" (tmp), [ret] "=&r" (ret)
: [old] "r" (old_val), [new_val] "r" (new_val)
: "memory");
return(ret);
}
/**
* Atomically compares the old value with the value at ptr, and if they match,
* stores new_val to ptr.
* If *ptr and old don't match, function returns failure immediately.
* If *ptr and old match, function spins until *ptr updated to new atomically, or
* until *ptr and old no longer match
*
* Does memory synchronization that is required to use this as a locking primitive.
*
* @return 1 on success (match and store)
* 0 on no match
*/
static inline uint32_t cvmx_atomic_compare_and_store32(uint32_t *ptr, uint32_t old_val, uint32_t new_val)
{
uint32_t ret;
CVMX_SYNCWS;
ret = cvmx_atomic_compare_and_store32_nosync(ptr, old_val, new_val);
CVMX_SYNCWS;
return ret;
}
/**
* Atomically compares the old value with the value at ptr, and if they match,
* stores new_val to ptr.
* If *ptr and old don't match, function returns failure immediately.
* If *ptr and old match, function spins until *ptr updated to new atomically, or
* until *ptr and old no longer match
*
* Does no memory synchronization.
*
* @return 1 on success (match and store)
* 0 on no match
*/
static inline uint64_t cvmx_atomic_compare_and_store64_nosync(uint64_t *ptr, uint64_t old_val, uint64_t new_val)
{
uint64_t tmp, ret;
__asm__ __volatile__(
".set noreorder \n"
"1: lld %[tmp], %[val] \n"
" li %[ret], 0 \n"
" bne %[tmp], %[old], 2f \n"
" move %[tmp], %[new_val] \n"
" scd %[tmp], %[val] \n"
" beqz %[tmp], 1b \n"
" li %[ret], 1 \n"
"2: nop \n"
".set reorder \n"
: [val] "+m" (*ptr), [tmp] "=&r" (tmp), [ret] "=&r" (ret)
: [old] "r" (old_val), [new_val] "r" (new_val)
: "memory");
return(ret);
}
/**
* Atomically compares the old value with the value at ptr, and if they match,
* stores new_val to ptr.
* If *ptr and old don't match, function returns failure immediately.
* If *ptr and old match, function spins until *ptr updated to new atomically, or
* until *ptr and old no longer match
*
* Does memory synchronization that is required to use this as a locking primitive.
*
* @return 1 on success (match and store)
* 0 on no match
*/
static inline uint64_t cvmx_atomic_compare_and_store64(uint64_t *ptr, uint64_t old_val, uint64_t new_val)
{
uint64_t ret;
CVMX_SYNCWS;
ret = cvmx_atomic_compare_and_store64_nosync(ptr, old_val, new_val);
CVMX_SYNCWS;
return ret;
}
/**
* Atomically adds a signed value to a 64 bit (aligned) memory location,
* and returns previous value.
*
* This version does not perform 'sync' operations to enforce memory
* operations. This should only be used when there are no memory operation
* ordering constraints. (This should NOT be used for reference counting -
* use the standard version instead.)
*
* @param ptr address in memory to add incr to
* @param incr amount to increment memory location by (signed)
*
* @return Value of memory location before increment
*/
static inline int64_t cvmx_atomic_fetch_and_add64_nosync(int64_t *ptr, int64_t incr)
{
uint64_t tmp, ret;
#if !defined(__FreeBSD__) || !defined(_KERNEL)
if (OCTEON_IS_MODEL(OCTEON_CN6XXX))
{
CVMX_PUSH_OCTEON2;
if (__builtin_constant_p(incr) && incr == 1)
{
__asm__ __volatile__(
"laid %0,(%2)"
: "=r" (ret), "+m" (ptr) : "r" (ptr) : "memory");
}
else if (__builtin_constant_p(incr) && incr == -1)
{
__asm__ __volatile__(
"ladd %0,(%2)"
: "=r" (ret), "+m" (ptr) : "r" (ptr) : "memory");
}
else
{
__asm__ __volatile__(
"laad %0,(%2),%3"
: "=r" (ret), "+m" (ptr) : "r" (ptr), "r" (incr) : "memory");
}
CVMX_POP_OCTEON2;
}
else
{
#endif
__asm__ __volatile__(
".set noreorder \n"
"1: lld %[tmp], %[val] \n"
" move %[ret], %[tmp] \n"
" daddu %[tmp], %[inc] \n"
" scd %[tmp], %[val] \n"
" beqz %[tmp], 1b \n"
" nop \n"
".set reorder \n"
: [val] "+m" (*ptr), [tmp] "=&r" (tmp), [ret] "=&r" (ret)
: [inc] "r" (incr)
: "memory");
#if !defined(__FreeBSD__) || !defined(_KERNEL)
}
#endif
return (ret);
}
/**
* Atomically adds a signed value to a 64 bit (aligned) memory location,
* and returns previous value.
*
* Memory access ordering is enforced before/after the atomic operation,
* so no additional 'sync' instructions are required.
*
* @param ptr address in memory to add incr to
* @param incr amount to increment memory location by (signed)
*
* @return Value of memory location before increment
*/
static inline int64_t cvmx_atomic_fetch_and_add64(int64_t *ptr, int64_t incr)
{
uint64_t ret;
CVMX_SYNCWS;
ret = cvmx_atomic_fetch_and_add64_nosync(ptr, incr);
CVMX_SYNCWS;
return ret;
}
/**
* Atomically adds a signed value to a 32 bit (aligned) memory location,
* and returns previous value.
*
* This version does not perform 'sync' operations to enforce memory
* operations. This should only be used when there are no memory operation
* ordering constraints. (This should NOT be used for reference counting -
* use the standard version instead.)
*
* @param ptr address in memory to add incr to
* @param incr amount to increment memory location by (signed)
*
* @return Value of memory location before increment
*/
static inline int32_t cvmx_atomic_fetch_and_add32_nosync(int32_t *ptr, int32_t incr)
{
uint32_t tmp, ret;
#if !defined(__FreeBSD__) || !defined(_KERNEL)
if (OCTEON_IS_MODEL(OCTEON_CN6XXX))
{
CVMX_PUSH_OCTEON2;
if (__builtin_constant_p(incr) && incr == 1)
{
__asm__ __volatile__(
"lai %0,(%2)"
: "=r" (ret), "+m" (ptr) : "r" (ptr) : "memory");
}
else if (__builtin_constant_p(incr) && incr == -1)
{
__asm__ __volatile__(
"lad %0,(%2)"
: "=r" (ret), "+m" (ptr) : "r" (ptr) : "memory");
}
else
{
__asm__ __volatile__(
"laa %0,(%2),%3"
: "=r" (ret), "+m" (ptr) : "r" (ptr), "r" (incr) : "memory");
}
CVMX_POP_OCTEON2;
}
else
{
#endif
__asm__ __volatile__(
".set noreorder \n"
"1: ll %[tmp], %[val] \n"
" move %[ret], %[tmp] \n"
" addu %[tmp], %[inc] \n"
" sc %[tmp], %[val] \n"
" beqz %[tmp], 1b \n"
" nop \n"
".set reorder \n"
: [val] "+m" (*ptr), [tmp] "=&r" (tmp), [ret] "=&r" (ret)
: [inc] "r" (incr)
: "memory");
#if !defined(__FreeBSD__) || !defined(_KERNEL)
}
#endif
return (ret);
}
/**
* Atomically adds a signed value to a 32 bit (aligned) memory location,
* and returns previous value.
*
* Memory access ordering is enforced before/after the atomic operation,
* so no additional 'sync' instructions are required.
*
* @param ptr address in memory to add incr to
* @param incr amount to increment memory location by (signed)
*
* @return Value of memory location before increment
*/
static inline int32_t cvmx_atomic_fetch_and_add32(int32_t *ptr, int32_t incr)
{
uint32_t ret;
CVMX_SYNCWS;
ret = cvmx_atomic_fetch_and_add32_nosync(ptr, incr);
CVMX_SYNCWS;
return ret;
}
/**
* Atomically set bits in a 64 bit (aligned) memory location,
* and returns previous value.
*
* This version does not perform 'sync' operations to enforce memory
* operations. This should only be used when there are no memory operation
* ordering constraints.
*
* @param ptr address in memory
* @param mask mask of bits to set
*
* @return Value of memory location before setting bits
*/
static inline uint64_t cvmx_atomic_fetch_and_bset64_nosync(uint64_t *ptr, uint64_t mask)
{
uint64_t tmp, ret;
__asm__ __volatile__(
".set noreorder \n"
"1: lld %[tmp], %[val] \n"
" move %[ret], %[tmp] \n"
" or %[tmp], %[msk] \n"
" scd %[tmp], %[val] \n"
" beqz %[tmp], 1b \n"
" nop \n"
".set reorder \n"
: [val] "+m" (*ptr), [tmp] "=&r" (tmp), [ret] "=&r" (ret)
: [msk] "r" (mask)
: "memory");
return (ret);
}
/**
* Atomically set bits in a 32 bit (aligned) memory location,
* and returns previous value.
*
* This version does not perform 'sync' operations to enforce memory
* operations. This should only be used when there are no memory operation
* ordering constraints.
*
* @param ptr address in memory
* @param mask mask of bits to set
*
* @return Value of memory location before setting bits
*/
static inline uint32_t cvmx_atomic_fetch_and_bset32_nosync(uint32_t *ptr, uint32_t mask)
{
uint32_t tmp, ret;
__asm__ __volatile__(
".set noreorder \n"
"1: ll %[tmp], %[val] \n"
" move %[ret], %[tmp] \n"
" or %[tmp], %[msk] \n"
" sc %[tmp], %[val] \n"
" beqz %[tmp], 1b \n"
" nop \n"
".set reorder \n"
: [val] "+m" (*ptr), [tmp] "=&r" (tmp), [ret] "=&r" (ret)
: [msk] "r" (mask)
: "memory");
return (ret);
}
/**
* Atomically clear bits in a 64 bit (aligned) memory location,
* and returns previous value.
*
* This version does not perform 'sync' operations to enforce memory
* operations. This should only be used when there are no memory operation
* ordering constraints.
*
* @param ptr address in memory
* @param mask mask of bits to clear
*
* @return Value of memory location before clearing bits
*/
static inline uint64_t cvmx_atomic_fetch_and_bclr64_nosync(uint64_t *ptr, uint64_t mask)
{
uint64_t tmp, ret;
__asm__ __volatile__(
".set noreorder \n"
" nor %[msk], 0 \n"
"1: lld %[tmp], %[val] \n"
" move %[ret], %[tmp] \n"
" and %[tmp], %[msk] \n"
" scd %[tmp], %[val] \n"
" beqz %[tmp], 1b \n"
" nop \n"
".set reorder \n"
: [val] "+m" (*ptr), [tmp] "=&r" (tmp), [ret] "=&r" (ret), [msk] "+r" (mask)
: : "memory");
return (ret);
}
/**
* Atomically clear bits in a 32 bit (aligned) memory location,
* and returns previous value.
*
* This version does not perform 'sync' operations to enforce memory
* operations. This should only be used when there are no memory operation
* ordering constraints.
*
* @param ptr address in memory
* @param mask mask of bits to clear
*
* @return Value of memory location before clearing bits
*/
static inline uint32_t cvmx_atomic_fetch_and_bclr32_nosync(uint32_t *ptr, uint32_t mask)
{
uint32_t tmp, ret;
__asm__ __volatile__(
".set noreorder \n"
" nor %[msk], 0 \n"
"1: ll %[tmp], %[val] \n"
" move %[ret], %[tmp] \n"
" and %[tmp], %[msk] \n"
" sc %[tmp], %[val] \n"
" beqz %[tmp], 1b \n"
" nop \n"
".set reorder \n"
: [val] "+m" (*ptr), [tmp] "=&r" (tmp), [ret] "=&r" (ret), [msk] "+r" (mask)
: : "memory");
return (ret);
}
/**
* Atomically swaps value in 64 bit (aligned) memory location,
* and returns previous value.
*
* This version does not perform 'sync' operations to enforce memory
* operations. This should only be used when there are no memory operation
* ordering constraints.
*
* @param ptr address in memory
* @param new_val new value to write
*
* @return Value of memory location before swap operation
*/
static inline uint64_t cvmx_atomic_swap64_nosync(uint64_t *ptr, uint64_t new_val)
{
uint64_t tmp, ret;
#if !defined(__FreeBSD__) || !defined(_KERNEL)
if (OCTEON_IS_MODEL(OCTEON_CN6XXX))
{
CVMX_PUSH_OCTEON2;
if (__builtin_constant_p(new_val) && new_val == 0)
{
__asm__ __volatile__(
"lacd %0,(%1)"
: "=r" (ret) : "r" (ptr) : "memory");
}
else if (__builtin_constant_p(new_val) && new_val == ~0ull)
{
__asm__ __volatile__(
"lasd %0,(%1)"
: "=r" (ret) : "r" (ptr) : "memory");
}
else
{
__asm__ __volatile__(
"lawd %0,(%1),%2"
: "=r" (ret) : "r" (ptr), "r" (new_val) : "memory");
}
CVMX_POP_OCTEON2;
}
else
{
#endif
__asm__ __volatile__(
".set noreorder \n"
"1: lld %[ret], %[val] \n"
" move %[tmp], %[new_val] \n"
" scd %[tmp], %[val] \n"
" beqz %[tmp], 1b \n"
" nop \n"
".set reorder \n"
: [val] "+m" (*ptr), [tmp] "=&r" (tmp), [ret] "=&r" (ret)
: [new_val] "r" (new_val)
: "memory");
#if !defined(__FreeBSD__) || !defined(_KERNEL)
}
#endif
return (ret);
}
/**
* Atomically swaps value in 32 bit (aligned) memory location,
* and returns previous value.
*
* This version does not perform 'sync' operations to enforce memory
* operations. This should only be used when there are no memory operation
* ordering constraints.
*
* @param ptr address in memory
* @param new_val new value to write
*
* @return Value of memory location before swap operation
*/
static inline uint32_t cvmx_atomic_swap32_nosync(uint32_t *ptr, uint32_t new_val)
{
uint32_t tmp, ret;
#if !defined(__FreeBSD__) || !defined(_KERNEL)
if (OCTEON_IS_MODEL(OCTEON_CN6XXX))
{
CVMX_PUSH_OCTEON2;
if (__builtin_constant_p(new_val) && new_val == 0)
{
__asm__ __volatile__(
"lac %0,(%1)"
: "=r" (ret) : "r" (ptr) : "memory");
}
else if (__builtin_constant_p(new_val) && new_val == ~0u)
{
__asm__ __volatile__(
"las %0,(%1)"
: "=r" (ret) : "r" (ptr) : "memory");
}
else
{
__asm__ __volatile__(
"law %0,(%1),%2"
: "=r" (ret) : "r" (ptr), "r" (new_val) : "memory");
}
CVMX_POP_OCTEON2;
}
else
{
#endif
__asm__ __volatile__(
".set noreorder \n"
"1: ll %[ret], %[val] \n"
" move %[tmp], %[new_val] \n"
" sc %[tmp], %[val] \n"
" beqz %[tmp], 1b \n"
" nop \n"
".set reorder \n"
: [val] "+m" (*ptr), [tmp] "=&r" (tmp), [ret] "=&r" (ret)
: [new_val] "r" (new_val)
: "memory");
#if !defined(__FreeBSD__) || !defined(_KERNEL)
}
#endif
return (ret);
}
/**
* This atomic operation is now named cvmx_atomic_compare_and_store32_nosync
* and the (deprecated) macro is provided for backward compatibility.
* @deprecated
*/
#define cvmx_atomic_compare_and_store_nosync32 cvmx_atomic_compare_and_store32_nosync
/**
* This atomic operation is now named cvmx_atomic_compare_and_store64_nosync
* and the (deprecated) macro is provided for backward compatibility.
* @deprecated
*/
#define cvmx_atomic_compare_and_store_nosync64 cvmx_atomic_compare_and_store64_nosync
#ifdef __cplusplus
}
#endif
#endif /* __CVMX_ATOMIC_H__ */