/*
* Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3.0 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* version 3.0 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3.0 along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
static OF_INLINE int
OFAtomicIntAdd(volatile int *_Nonnull p, int i)
{
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %2\n\t"
"add %0, %0, %1\n\t"
"stwcx. %0, 0, %2\n\t"
"bne- 0b"
: "=&r" (i)
: "r" (i),
"r" (p)
: "cc", "memory"
);
return i;
}
static OF_INLINE int32_t
OFAtomicInt32Add(volatile int32_t *_Nonnull p, int32_t i)
{
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %2\n\t"
"add %0, %0, %1\n\t"
"stwcx. %0, 0, %2\n\t"
"bne- 0b"
: "=&r" (i)
: "r" (i),
"r" (p)
: "cc", "memory"
);
return i;
}
static OF_INLINE void *_Nullable
OFAtomicPointerAdd(void *volatile _Nullable *_Nonnull p, intptr_t i)
{
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %2\n\t"
"add %0, %0, %1\n\t"
"stwcx. %0, 0, %2\n\t"
"bne- 0b"
: "=&r" (i)
: "r" (i),
"r" (p)
: "cc", "memory"
);
return (void *)i;
}
static OF_INLINE int
OFAtomicIntSubtract(volatile int *_Nonnull p, int i)
{
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %2\n\t"
"sub %0, %0, %1\n\t"
"stwcx. %0, 0, %2\n\t"
"bne- 0b"
: "=&r" (i)
: "r" (i),
"r" (p)
: "cc", "memory"
);
return i;
}
static OF_INLINE int32_t
OFAtomicInt32Subtract(volatile int32_t *_Nonnull p, int32_t i)
{
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %2\n\t"
"sub %0, %0, %1\n\t"
"stwcx. %0, 0, %2\n\t"
"bne- 0b"
: "=&r" (i)
: "r" (i),
"r" (p)
: "cc", "memory"
);
return i;
}
static OF_INLINE void *_Nullable
OFAtomicPointerSubtract(void *volatile _Nullable *_Nonnull p, intptr_t i)
{
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %2\n\t"
"sub %0, %0, %1\n\t"
"stwcx. %0, 0, %2\n\t"
"bne- 0b"
: "=&r" (i)
: "r" (i),
"r" (p)
: "cc", "memory"
);
return (void *)i;
}
static OF_INLINE int
OFAtomicIntIncrease(volatile int *_Nonnull p)
{
int i;
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %1\n\t"
"addi %0, %0, 1\n\t"
"stwcx. %0, 0, %1\n\t"
"bne- 0b"
: "=&r" (i)
: "r" (p)
: "cc", "memory"
);
return i;
}
static OF_INLINE int32_t
OFAtomicInt32Increase(volatile int32_t *_Nonnull p)
{
int32_t i;
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %1\n\t"
"addi %0, %0, 1\n\t"
"stwcx. %0, 0, %1\n\t"
"bne- 0b"
: "=&r" (i)
: "r" (p)
: "cc", "memory"
);
return i;
}
static OF_INLINE int
OFAtomicIntDecrease(volatile int *_Nonnull p)
{
int i;
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %1\n\t"
"subi %0, %0, 1\n\t"
"stwcx. %0, 0, %1\n\t"
"bne- 0b"
: "=&r" (i)
: "r" (p)
: "cc", "memory"
);
return i;
}
static OF_INLINE int32_t
OFAtomicInt32Decrease(volatile int32_t *_Nonnull p)
{
int32_t i;
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %1\n\t"
"subi %0, %0, 1\n\t"
"stwcx. %0, 0, %1\n\t"
"bne- 0b"
: "=&r" (i)
: "r" (p)
: "cc", "memory"
);
return i;
}
static OF_INLINE unsigned int
OFAtomicIntOr(volatile unsigned int *_Nonnull p, unsigned int i)
{
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %2\n\t"
"or %0, %0, %1\n\t"
"stwcx. %0, 0, %2\n\t"
"bne- 0b"
: "=&r" (i)
: "r" (i),
"r" (p)
: "cc", "memory"
);
return i;
}
static OF_INLINE uint32_t
OFAtomicInt32Or(volatile uint32_t *_Nonnull p, uint32_t i)
{
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %2\n\t"
"or %0, %0, %1\n\t"
"stwcx. %0, 0, %2\n\t"
"bne- 0b"
: "=&r" (i)
: "r" (i),
"r" (p)
: "cc", "memory"
);
return i;
}
static OF_INLINE unsigned int
OFAtomicIntAnd(volatile unsigned int *_Nonnull p, unsigned int i)
{
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %2\n\t"
"and %0, %0, %1\n\t"
"stwcx. %0, 0, %2\n\t"
"bne- 0b"
: "=&r" (i)
: "r" (i),
"r" (p)
: "cc", "memory"
);
return i;
}
static OF_INLINE uint32_t
OFAtomicInt32And(volatile uint32_t *_Nonnull p, uint32_t i)
{
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %2\n\t"
"and %0, %0, %1\n\t"
"stwcx. %0, 0, %2\n\t"
"bne- 0b"
: "=&r" (i)
: "r" (i),
"r" (p)
: "cc", "memory"
);
return i;
}
static OF_INLINE unsigned int
OFAtomicIntXor(volatile unsigned int *_Nonnull p, unsigned int i)
{
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %2\n\t"
"xor %0, %0, %1\n\t"
"stwcx. %0, 0, %2\n\t"
"bne- 0b"
: "=&r" (i)
: "r" (i),
"r" (p)
: "cc", "memory"
);
return i;
}
static OF_INLINE uint32_t
OFAtomicInt32Xor(volatile uint32_t *_Nonnull p, uint32_t i)
{
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %2\n\t"
"xor %0, %0, %1\n\t"
"stwcx. %0, 0, %2\n\t"
"bne- 0b"
: "=&r" (i)
: "r" (i),
"r" (p)
: "cc", "memory"
);
return i;
}
static OF_INLINE bool
OFAtomicIntCompareAndSwap(volatile int *_Nonnull p, int o, int n)
{
int r;
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %3\n\t"
"cmpw %0, %1\n\t"
"bne 1f\n\t"
"stwcx. %2, 0, %3\n\t"
"bne- 0b\n\t"
"li %0, 1\n\t"
"b 2f\n\t"
"1:\n\t"
"stwcx. %0, 0, %3\n\t"
"li %0, 0\n\t"
"2:"
: "=&r" (r)
: "r" (o),
"r" (n),
"r" (p)
: "cc", "memory"
);
return r;
}
static OF_INLINE bool
OFAtomicInt32CompareAndSwap(volatile int32_t *_Nonnull p, int32_t o, int32_t n)
{
int r;
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %3\n\t"
"cmpw %0, %1\n\t"
"bne 1f\n\t"
"stwcx. %2, 0, %3\n\t"
"bne- 0b\n\t"
"li %0, 1\n\t"
"b 2f\n\t"
"1:\n\t"
"stwcx. %0, 0, %3\n\t"
"li %0, 0\n\t"
"2:"
: "=&r" (r)
: "r" (o),
"r" (n),
"r" (p)
: "cc", "memory"
);
return r;
}
static OF_INLINE bool
OFAtomicPointerCompareAndSwap(void *volatile _Nullable *_Nonnull p,
void *_Nullable o, void *_Nullable n)
{
int r;
__asm__ __volatile__ (
"0:\n\t"
"lwarx %0, 0, %3\n\t"
"cmpw %0, %1\n\t"
"bne 1f\n\t"
"stwcx. %2, 0, %3\n\t"
"bne- 0b\n\t"
"li %0, 1\n\t"
"b 2f\n\t"
"1:\n\t"
"stwcx. %0, 0, %3\n\t"
"li %0, 0\n\t"
"2:"
: "=&r" (r)
: "r" (o),
"r" (n),
"r" (p)
: "cc", "memory"
);
return r;
}
static OF_INLINE void
OFMemoryBarrier(void)
{
__asm__ __volatile__ (
".long 0x7C0004AC /* sync */" ::: "memory"
);
}
static OF_INLINE void
OFAcquireMemoryBarrier(void)
{
__asm__ __volatile__ (
".long 0x7C2004AC /* lwsync */" ::: "memory"
);
}
static OF_INLINE void
OFReleaseMemoryBarrier(void)
{
__asm__ __volatile__ (
".long 0x7C2004AC /* lwsync */" ::: "memory"
);
}