diff options
Diffstat (limited to 'arch/ia64/include/asm/cmpxchg.h')
| -rw-r--r-- | arch/ia64/include/asm/cmpxchg.h | 148 |
1 files changed, 147 insertions, 1 deletions
diff --git a/arch/ia64/include/asm/cmpxchg.h b/arch/ia64/include/asm/cmpxchg.h index 4c96187e2049..4f37dbbb8640 100644 --- a/arch/ia64/include/asm/cmpxchg.h +++ b/arch/ia64/include/asm/cmpxchg.h | |||
| @@ -1 +1,147 @@ | |||
| 1 | #include <asm/intrinsics.h> | 1 | #ifndef _ASM_IA64_CMPXCHG_H |
| 2 | #define _ASM_IA64_CMPXCHG_H | ||
| 3 | |||
| 4 | /* | ||
| 5 | * Compare/Exchange, forked from asm/intrinsics.h | ||
| 6 | * which was: | ||
| 7 | * | ||
| 8 | * Copyright (C) 2002-2003 Hewlett-Packard Co | ||
| 9 | * David Mosberger-Tang <davidm@hpl.hp.com> | ||
| 10 | */ | ||
| 11 | |||
| 12 | #ifndef __ASSEMBLY__ | ||
| 13 | |||
| 14 | #include <linux/types.h> | ||
| 15 | /* include compiler specific intrinsics */ | ||
| 16 | #include <asm/ia64regs.h> | ||
| 17 | #ifdef __INTEL_COMPILER | ||
| 18 | # include <asm/intel_intrin.h> | ||
| 19 | #else | ||
| 20 | # include <asm/gcc_intrin.h> | ||
| 21 | #endif | ||
| 22 | |||
| 23 | /* | ||
| 24 | * This function doesn't exist, so you'll get a linker error if | ||
| 25 | * something tries to do an invalid xchg(). | ||
| 26 | */ | ||
| 27 | extern void ia64_xchg_called_with_bad_pointer(void); | ||
| 28 | |||
| 29 | #define __xchg(x, ptr, size) \ | ||
| 30 | ({ \ | ||
| 31 | unsigned long __xchg_result; \ | ||
| 32 | \ | ||
| 33 | switch (size) { \ | ||
| 34 | case 1: \ | ||
| 35 | __xchg_result = ia64_xchg1((__u8 *)ptr, x); \ | ||
| 36 | break; \ | ||
| 37 | \ | ||
| 38 | case 2: \ | ||
| 39 | __xchg_result = ia64_xchg2((__u16 *)ptr, x); \ | ||
| 40 | break; \ | ||
| 41 | \ | ||
| 42 | case 4: \ | ||
| 43 | __xchg_result = ia64_xchg4((__u32 *)ptr, x); \ | ||
| 44 | break; \ | ||
| 45 | \ | ||
| 46 | case 8: \ | ||
| 47 | __xchg_result = ia64_xchg8((__u64 *)ptr, x); \ | ||
| 48 | break; \ | ||
| 49 | default: \ | ||
| 50 | ia64_xchg_called_with_bad_pointer(); \ | ||
| 51 | } \ | ||
| 52 | __xchg_result; \ | ||
| 53 | }) | ||
| 54 | |||
| 55 | #define xchg(ptr, x) \ | ||
| 56 | ((__typeof__(*(ptr))) __xchg((unsigned long) (x), (ptr), sizeof(*(ptr)))) | ||
| 57 | |||
| 58 | /* | ||
| 59 | * Atomic compare and exchange. Compare OLD with MEM, if identical, | ||
| 60 | * store NEW in MEM. Return the initial value in MEM. Success is | ||
| 61 | * indicated by comparing RETURN with OLD. | ||
| 62 | */ | ||
| 63 | |||
| 64 | #define __HAVE_ARCH_CMPXCHG 1 | ||
| 65 | |||
| 66 | /* | ||
| 67 | * This function doesn't exist, so you'll get a linker error | ||
| 68 | * if something tries to do an invalid cmpxchg(). | ||
| 69 | */ | ||
| 70 | extern long ia64_cmpxchg_called_with_bad_pointer(void); | ||
| 71 | |||
| 72 | #define ia64_cmpxchg(sem, ptr, old, new, size) \ | ||
| 73 | ({ \ | ||
| 74 | __u64 _o_, _r_; \ | ||
| 75 | \ | ||
| 76 | switch (size) { \ | ||
| 77 | case 1: \ | ||
| 78 | _o_ = (__u8) (long) (old); \ | ||
| 79 | break; \ | ||
| 80 | case 2: \ | ||
| 81 | _o_ = (__u16) (long) (old); \ | ||
| 82 | break; \ | ||
| 83 | case 4: \ | ||
| 84 | _o_ = (__u32) (long) (old); \ | ||
| 85 | break; \ | ||
| 86 | case 8: \ | ||
| 87 | _o_ = (__u64) (long) (old); \ | ||
| 88 | break; \ | ||
| 89 | default: \ | ||
| 90 | break; \ | ||
| 91 | } \ | ||
| 92 | switch (size) { \ | ||
| 93 | case 1: \ | ||
| 94 | _r_ = ia64_cmpxchg1_##sem((__u8 *) ptr, new, _o_); \ | ||
| 95 | break; \ | ||
| 96 | \ | ||
| 97 | case 2: \ | ||
| 98 | _r_ = ia64_cmpxchg2_##sem((__u16 *) ptr, new, _o_); \ | ||
| 99 | break; \ | ||
| 100 | \ | ||
| 101 | case 4: \ | ||
| 102 | _r_ = ia64_cmpxchg4_##sem((__u32 *) ptr, new, _o_); \ | ||
| 103 | break; \ | ||
| 104 | \ | ||
| 105 | case 8: \ | ||
| 106 | _r_ = ia64_cmpxchg8_##sem((__u64 *) ptr, new, _o_); \ | ||
| 107 | break; \ | ||
| 108 | \ | ||
| 109 | default: \ | ||
| 110 | _r_ = ia64_cmpxchg_called_with_bad_pointer(); \ | ||
| 111 | break; \ | ||
| 112 | } \ | ||
| 113 | (__typeof__(old)) _r_; \ | ||
| 114 | }) | ||
| 115 | |||
| 116 | #define cmpxchg_acq(ptr, o, n) \ | ||
| 117 | ia64_cmpxchg(acq, (ptr), (o), (n), sizeof(*(ptr))) | ||
| 118 | #define cmpxchg_rel(ptr, o, n) \ | ||
| 119 | ia64_cmpxchg(rel, (ptr), (o), (n), sizeof(*(ptr))) | ||
| 120 | |||
| 121 | /* for compatibility with other platforms: */ | ||
| 122 | #define cmpxchg(ptr, o, n) cmpxchg_acq((ptr), (o), (n)) | ||
| 123 | #define cmpxchg64(ptr, o, n) cmpxchg_acq((ptr), (o), (n)) | ||
| 124 | |||
| 125 | #define cmpxchg_local cmpxchg | ||
| 126 | #define cmpxchg64_local cmpxchg64 | ||
| 127 | |||
| 128 | #ifdef CONFIG_IA64_DEBUG_CMPXCHG | ||
| 129 | # define CMPXCHG_BUGCHECK_DECL int _cmpxchg_bugcheck_count = 128; | ||
| 130 | # define CMPXCHG_BUGCHECK(v) \ | ||
| 131 | do { \ | ||
| 132 | if (_cmpxchg_bugcheck_count-- <= 0) { \ | ||
| 133 | void *ip; \ | ||
| 134 | extern int printk(const char *fmt, ...); \ | ||
| 135 | ip = (void *) ia64_getreg(_IA64_REG_IP); \ | ||
| 136 | printk("CMPXCHG_BUGCHECK: stuck at %p on word %p\n", ip, (v));\ | ||
| 137 | break; \ | ||
| 138 | } \ | ||
| 139 | } while (0) | ||
| 140 | #else /* !CONFIG_IA64_DEBUG_CMPXCHG */ | ||
| 141 | # define CMPXCHG_BUGCHECK_DECL | ||
| 142 | # define CMPXCHG_BUGCHECK(v) | ||
| 143 | #endif /* !CONFIG_IA64_DEBUG_CMPXCHG */ | ||
| 144 | |||
| 145 | #endif /* !__ASSEMBLY__ */ | ||
| 146 | |||
| 147 | #endif /* _ASM_IA64_CMPXCHG_H */ | ||