125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2003, 06, 07 by Ralf Baechle (ralf@linux-mips.org)
|
|
*/
|
|
#ifndef __ASM_CMPXCHG_H
|
|
#define __ASM_CMPXCHG_H
|
|
|
|
#include <linux/irqflags.h>
|
|
|
|
#define __HAVE_ARCH_CMPXCHG 1
|
|
|
|
#define __cmpxchg_asm(ld, st, m, old, new) \
|
|
({ \
|
|
__typeof(*(m)) __ret; \
|
|
\
|
|
if (cpu_has_llsc && R10000_LLSC_WAR) { \
|
|
__asm__ __volatile__( \
|
|
" .set push \n" \
|
|
" .set noat \n" \
|
|
" .set mips3 \n" \
|
|
"1: " ld " %0, %2 # __cmpxchg_asm \n" \
|
|
" bne %0, %z3, 2f \n" \
|
|
" .set mips0 \n" \
|
|
" move $1, %z4 \n" \
|
|
" .set mips3 \n" \
|
|
" " st " $1, %1 \n" \
|
|
" beqzl $1, 1b \n" \
|
|
"2: \n" \
|
|
" .set pop \n" \
|
|
: "=&r" (__ret), "=R" (*m) \
|
|
: "R" (*m), "Jr" (old), "Jr" (new) \
|
|
: "memory"); \
|
|
} else if (cpu_has_llsc) { \
|
|
__asm__ __volatile__( \
|
|
" .set push \n" \
|
|
" .set noat \n" \
|
|
" .set mips3 \n" \
|
|
"1: " ld " %0, %2 # __cmpxchg_asm \n" \
|
|
" bne %0, %z3, 2f \n" \
|
|
" .set mips0 \n" \
|
|
" move $1, %z4 \n" \
|
|
" .set mips3 \n" \
|
|
" " st " $1, %1 \n" \
|
|
" beqz $1, 3f \n" \
|
|
"2: \n" \
|
|
" .subsection 2 \n" \
|
|
"3: b 1b \n" \
|
|
" .previous \n" \
|
|
" .set pop \n" \
|
|
: "=&r" (__ret), "=R" (*m) \
|
|
: "R" (*m), "Jr" (old), "Jr" (new) \
|
|
: "memory"); \
|
|
} else { \
|
|
unsigned long __flags; \
|
|
\
|
|
raw_local_irq_save(__flags); \
|
|
__ret = *m; \
|
|
if (__ret == old) \
|
|
*m = new; \
|
|
raw_local_irq_restore(__flags); \
|
|
} \
|
|
\
|
|
__ret; \
|
|
})
|
|
|
|
/*
|
|
* This function doesn't exist, so you'll get a linker error
|
|
* if something tries to do an invalid cmpxchg().
|
|
*/
|
|
extern void __cmpxchg_called_with_bad_pointer(void);
|
|
|
|
#define __cmpxchg(ptr, old, new, barrier) \
|
|
({ \
|
|
__typeof__(ptr) __ptr = (ptr); \
|
|
__typeof__(*(ptr)) __old = (old); \
|
|
__typeof__(*(ptr)) __new = (new); \
|
|
__typeof__(*(ptr)) __res = 0; \
|
|
\
|
|
barrier; \
|
|
\
|
|
switch (sizeof(*(__ptr))) { \
|
|
case 4: \
|
|
__res = __cmpxchg_asm("ll", "sc", __ptr, __old, __new); \
|
|
break; \
|
|
case 8: \
|
|
if (sizeof(long) == 8) { \
|
|
__res = __cmpxchg_asm("lld", "scd", __ptr, \
|
|
__old, __new); \
|
|
break; \
|
|
} \
|
|
default: \
|
|
__cmpxchg_called_with_bad_pointer(); \
|
|
break; \
|
|
} \
|
|
\
|
|
barrier; \
|
|
\
|
|
__res; \
|
|
})
|
|
|
|
#define cmpxchg(ptr, old, new) __cmpxchg(ptr, old, new, smp_llsc_mb())
|
|
#define cmpxchg_local(ptr, old, new) __cmpxchg(ptr, old, new, )
|
|
|
|
#define cmpxchg64(ptr, o, n) \
|
|
({ \
|
|
BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
|
|
cmpxchg((ptr), (o), (n)); \
|
|
})
|
|
|
|
#ifdef CONFIG_64BIT
|
|
#define cmpxchg64_local(ptr, o, n) \
|
|
({ \
|
|
BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
|
|
cmpxchg_local((ptr), (o), (n)); \
|
|
})
|
|
#else
|
|
#include <asm-generic/cmpxchg-local.h>
|
|
#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
|
|
#endif
|
|
|
|
#endif /* __ASM_CMPXCHG_H */
|