diff options
Diffstat (limited to 'target/linux/realtek/files/arch/rlx/include/asm/cmpxchg.h')
| -rw-r--r-- | target/linux/realtek/files/arch/rlx/include/asm/cmpxchg.h | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/target/linux/realtek/files/arch/rlx/include/asm/cmpxchg.h b/target/linux/realtek/files/arch/rlx/include/asm/cmpxchg.h new file mode 100644 index 000000000..dbf73e889 --- /dev/null +++ b/target/linux/realtek/files/arch/rlx/include/asm/cmpxchg.h @@ -0,0 +1,116 @@ +/* + * 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 + +#ifdef CONFIG_CPU_HAS_LLSC +#if defined(CONFIG_CPU_RLX4181) || defined(CONFIG_CPU_RLX5181) || defined(CONFIG_CPU_RLX5281) +#define __cmpxchg_asm(ld, st, m, old, new) \ +({ \ + __typeof(*(m)) __ret; \ + \ + __asm__ __volatile__( \ + " .set push \n" \ + " .set noat \n" \ + " .set mips3 \n" \ + "1: " ld " %0, %2 # __cmpxchg_asm \n" \ + " nop \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"); \ + __ret; \ +}) +#else +#define __cmpxchg_asm(ld, st, m, old, new) \ +({ \ + __typeof(*(m)) __ret; \ + \ + __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"); \ + __ret; \ +}) +#endif +#else +#define __cmpxchg_asm(ld, st, m, old, new) \ +({ \ + __typeof(*(m)) __ret; \ + unsigned long __flags; \ + \ + raw_local_irq_save(__flags); \ + __ret = *m; \ + if (__ret == old) \ + *m = new; \ + raw_local_irq_restore(__flags); \ + \ + __ret; \ +}) +#endif + +#define __cmpxchg(ptr, old, new, barrier) \ +({ \ + __typeof__(ptr) __ptr = (ptr); \ + __typeof__(*(ptr)) __old = (old); \ + __typeof__(*(ptr)) __new = (new); \ + __typeof__(*(ptr)) __res = 0; \ + \ + barrier; \ + \ + __res = __cmpxchg_asm("ll", "sc", __ptr, __old, __new); \ + \ + barrier; \ + \ + __res; \ +}) + +#define cmpxchg(ptr, old, new) __cmpxchg(ptr, old, new, smp_llsc_mb()) +#define cmpxchg_local(ptr, old, new) __cmpxchg(ptr, old, new, ) + +#if 0 +#define cmpxchg64(ptr, o, n) \ + ({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ + cmpxchg((ptr), (o), (n)); \ + }) + +#include <asm-generic/cmpxchg-local.h> +#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) +#endif + +#endif /* __ASM_CMPXCHG_H */ |