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author | Ralf Baechle <ralf@linux-mips.org> | 2008-09-16 19:48:51 +0200 |
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committer | Ralf Baechle <ralf@linux-mips.org> | 2008-10-11 16:18:52 +0100 |
commit | 384740dc49ea651ba350704d13ff6be9976e37fe (patch) | |
tree | a6e80cad287ccae7a86d81bfa692fc96889c88ed /arch/mips/include/asm/cmpxchg.h | |
parent | e8c7c482347574ecdd45c43e32c332d5fc2ece61 (diff) | |
download | kernel_samsung_smdk4412-384740dc49ea651ba350704d13ff6be9976e37fe.zip kernel_samsung_smdk4412-384740dc49ea651ba350704d13ff6be9976e37fe.tar.gz kernel_samsung_smdk4412-384740dc49ea651ba350704d13ff6be9976e37fe.tar.bz2 |
MIPS: Move headfiles to new location below arch/mips/include
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include/asm/cmpxchg.h')
-rw-r--r-- | arch/mips/include/asm/cmpxchg.h | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/arch/mips/include/asm/cmpxchg.h b/arch/mips/include/asm/cmpxchg.h new file mode 100644 index 0000000..4a812c3 --- /dev/null +++ b/arch/mips/include/asm/cmpxchg.h @@ -0,0 +1,124 @@ +/* + * 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 */ |