| #ifndef PL_ATOMIC_OPS_H |
| #define PL_ATOMIC_OPS_H |
| |
| |
| /* compiler-only memory barrier, for use around locks */ |
| #define pl_barrier() do { \ |
| asm volatile("" ::: "memory"); \ |
| } while (0) |
| |
| #if defined(__i386__) || defined (__i486__) || defined (__i586__) || defined (__i686__) || defined (__x86_64__) |
| |
| /* full memory barrier using mfence when SSE2 is supported, falling back to |
| * "lock add %esp" (gcc uses "lock add" or "lock or"). |
| */ |
| #if defined(__SSE2__) |
| |
| #define pl_mb() do { \ |
| asm volatile("mfence" ::: "memory"); \ |
| } while (0) |
| |
| #elif defined(__x86_64__) |
| |
| #define pl_mb() do { \ |
| asm volatile("lock addl $0,0 (%%rsp)" ::: "memory", "cc"); \ |
| } while (0) |
| |
| #else /* ix86 */ |
| |
| #define pl_mb() do { \ |
| asm volatile("lock addl $0,0 (%%esp)" ::: "memory", "cc"); \ |
| } while (0) |
| |
| #endif /* end of pl_mb() case for sse2/x86_64/x86 */ |
| |
| /* |
| * Generic functions common to the x86 family |
| */ |
| |
| #define pl_cpu_relax() do { \ |
| asm volatile("rep;nop\n"); \ |
| } while (0) |
| |
| /* increment integer value pointed to by pointer <ptr>, and return non-zero if |
| * result is non-null. |
| */ |
| #define pl_inc(ptr) ( \ |
| (sizeof(long) == 8 && sizeof(*(ptr)) == 8) ? ({ \ |
| unsigned char ret; \ |
| asm volatile("lock incq %0\n" \ |
| "setne %1\n" \ |
| : "+m" (*(ptr)), "=qm" (ret) \ |
| : \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : (sizeof(*(ptr)) == 4) ? ({ \ |
| unsigned char ret; \ |
| asm volatile("lock incl %0\n" \ |
| "setne %1\n" \ |
| : "+m" (*(ptr)), "=qm" (ret) \ |
| : \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : (sizeof(*(ptr)) == 2) ? ({ \ |
| unsigned char ret; \ |
| asm volatile("lock incw %0\n" \ |
| "setne %1\n" \ |
| : "+m" (*(ptr)), "=qm" (ret) \ |
| : \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : (sizeof(*(ptr)) == 1) ? ({ \ |
| unsigned char ret; \ |
| asm volatile("lock incb %0\n" \ |
| "setne %1\n" \ |
| : "+m" (*(ptr)), "=qm" (ret) \ |
| : \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : ({ \ |
| void __unsupported_argument_size_for_pl_inc__(char *,int); \ |
| if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \ |
| sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \ |
| __unsupported_argument_size_for_pl_inc__(__FILE__,__LINE__); \ |
| 0; \ |
| }) \ |
| ) |
| |
| /* decrement integer value pointed to by pointer <ptr>, and return non-zero if |
| * result is non-null. |
| */ |
| #define pl_dec(ptr) ( \ |
| (sizeof(long) == 8 && sizeof(*(ptr)) == 8) ? ({ \ |
| unsigned char ret; \ |
| asm volatile("lock decq %0\n" \ |
| "setne %1\n" \ |
| : "+m" (*(ptr)), "=qm" (ret) \ |
| : \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : (sizeof(*(ptr)) == 4) ? ({ \ |
| unsigned char ret; \ |
| asm volatile("lock decl %0\n" \ |
| "setne %1\n" \ |
| : "+m" (*(ptr)), "=qm" (ret) \ |
| : \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : (sizeof(*(ptr)) == 2) ? ({ \ |
| unsigned char ret; \ |
| asm volatile("lock decw %0\n" \ |
| "setne %1\n" \ |
| : "+m" (*(ptr)), "=qm" (ret) \ |
| : \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : (sizeof(*(ptr)) == 1) ? ({ \ |
| unsigned char ret; \ |
| asm volatile("lock decb %0\n" \ |
| "setne %1\n" \ |
| : "+m" (*(ptr)), "=qm" (ret) \ |
| : \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : ({ \ |
| void __unsupported_argument_size_for_pl_dec__(char *,int); \ |
| if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \ |
| sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \ |
| __unsupported_argument_size_for_pl_dec__(__FILE__,__LINE__); \ |
| 0; \ |
| }) \ |
| ) |
| |
| /* increment integer value pointed to by pointer <ptr>, no return */ |
| #define pl_inc_noret(ptr) ({ \ |
| if (sizeof(long) == 8 && sizeof(*(ptr)) == 8) { \ |
| asm volatile("lock incq %0\n" \ |
| : "+m" (*(ptr)) \ |
| : \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 4) { \ |
| asm volatile("lock incl %0\n" \ |
| : "+m" (*(ptr)) \ |
| : \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 2) { \ |
| asm volatile("lock incw %0\n" \ |
| : "+m" (*(ptr)) \ |
| : \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 1) { \ |
| asm volatile("lock incb %0\n" \ |
| : "+m" (*(ptr)) \ |
| : \ |
| : "cc"); \ |
| } else { \ |
| void __unsupported_argument_size_for_pl_inc_noret__(char *,int); \ |
| if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \ |
| sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \ |
| __unsupported_argument_size_for_pl_inc_noret__(__FILE__,__LINE__); \ |
| } \ |
| }) |
| |
| /* decrement integer value pointed to by pointer <ptr>, no return */ |
| #define pl_dec_noret(ptr) ({ \ |
| if (sizeof(long) == 8 && sizeof(*(ptr)) == 8) { \ |
| asm volatile("lock decq %0\n" \ |
| : "+m" (*(ptr)) \ |
| : \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 4) { \ |
| asm volatile("lock decl %0\n" \ |
| : "+m" (*(ptr)) \ |
| : \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 2) { \ |
| asm volatile("lock decw %0\n" \ |
| : "+m" (*(ptr)) \ |
| : \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 1) { \ |
| asm volatile("lock decb %0\n" \ |
| : "+m" (*(ptr)) \ |
| : \ |
| : "cc"); \ |
| } else { \ |
| void __unsupported_argument_size_for_pl_dec_noret__(char *,int); \ |
| if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \ |
| sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \ |
| __unsupported_argument_size_for_pl_dec_noret__(__FILE__,__LINE__); \ |
| } \ |
| }) |
| |
| /* add integer constant <x> to integer value pointed to by pointer <ptr>, |
| * no return. Size of <x> is not checked. |
| */ |
| #define pl_add(ptr, x) ({ \ |
| if (sizeof(long) == 8 && sizeof(*(ptr)) == 8) { \ |
| asm volatile("lock addq %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned long)(x)) \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 4) { \ |
| asm volatile("lock addl %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned int)(x)) \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 2) { \ |
| asm volatile("lock addw %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned short)(x)) \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 1) { \ |
| asm volatile("lock addb %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned char)(x)) \ |
| : "cc"); \ |
| } else { \ |
| void __unsupported_argument_size_for_pl_add__(char *,int); \ |
| if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \ |
| sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \ |
| __unsupported_argument_size_for_pl_add__(__FILE__,__LINE__); \ |
| } \ |
| }) |
| |
| /* subtract integer constant <x> from integer value pointed to by pointer |
| * <ptr>, no return. Size of <x> is not checked. |
| */ |
| #define pl_sub(ptr, x) ({ \ |
| if (sizeof(long) == 8 && sizeof(*(ptr)) == 8) { \ |
| asm volatile("lock subq %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned long)(x)) \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 4) { \ |
| asm volatile("lock subl %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned int)(x)) \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 2) { \ |
| asm volatile("lock subw %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned short)(x)) \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 1) { \ |
| asm volatile("lock subb %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned char)(x)) \ |
| : "cc"); \ |
| } else { \ |
| void __unsupported_argument_size_for_pl_sub__(char *,int); \ |
| if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \ |
| sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \ |
| __unsupported_argument_size_for_pl_sub__(__FILE__,__LINE__); \ |
| } \ |
| }) |
| |
| /* binary and integer value pointed to by pointer <ptr> with constant <x>, no |
| * return. Size of <x> is not checked. |
| */ |
| #define pl_and(ptr, x) ({ \ |
| if (sizeof(long) == 8 && sizeof(*(ptr)) == 8) { \ |
| asm volatile("lock andq %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned long)(x)) \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 4) { \ |
| asm volatile("lock andl %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned int)(x)) \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 2) { \ |
| asm volatile("lock andw %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned short)(x)) \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 1) { \ |
| asm volatile("lock andb %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned char)(x)) \ |
| : "cc"); \ |
| } else { \ |
| void __unsupported_argument_size_for_pl_and__(char *,int); \ |
| if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \ |
| sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \ |
| __unsupported_argument_size_for_pl_and__(__FILE__,__LINE__); \ |
| } \ |
| }) |
| |
| /* binary or integer value pointed to by pointer <ptr> with constant <x>, no |
| * return. Size of <x> is not checked. |
| */ |
| #define pl_or(ptr, x) ({ \ |
| if (sizeof(long) == 8 && sizeof(*(ptr)) == 8) { \ |
| asm volatile("lock orq %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned long)(x)) \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 4) { \ |
| asm volatile("lock orl %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned int)(x)) \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 2) { \ |
| asm volatile("lock orw %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned short)(x)) \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 1) { \ |
| asm volatile("lock orb %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned char)(x)) \ |
| : "cc"); \ |
| } else { \ |
| void __unsupported_argument_size_for_pl_or__(char *,int); \ |
| if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \ |
| sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \ |
| __unsupported_argument_size_for_pl_or__(__FILE__,__LINE__); \ |
| } \ |
| }) |
| |
| /* binary xor integer value pointed to by pointer <ptr> with constant <x>, no |
| * return. Size of <x> is not checked. |
| */ |
| #define pl_xor(ptr, x) ({ \ |
| if (sizeof(long) == 8 && sizeof(*(ptr)) == 8) { \ |
| asm volatile("lock xorq %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned long)(x)) \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 4) { \ |
| asm volatile("lock xorl %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned int)(x)) \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 2) { \ |
| asm volatile("lock xorw %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned short)(x)) \ |
| : "cc"); \ |
| } else if (sizeof(*(ptr)) == 1) { \ |
| asm volatile("lock xorb %1, %0\n" \ |
| : "+m" (*(ptr)) \ |
| : "er" ((unsigned char)(x)) \ |
| : "cc"); \ |
| } else { \ |
| void __unsupported_argument_size_for_pl_xor__(char *,int); \ |
| if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \ |
| sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \ |
| __unsupported_argument_size_for_pl_xor__(__FILE__,__LINE__); \ |
| } \ |
| }) |
| |
| /* test and set bit <bit> in integer value pointed to by pointer <ptr>. Returns |
| * 0 if the bit was not set, or ~0 of the same type as *ptr if it was set. Note |
| * that there is no 8-bit equivalent operation. |
| */ |
| #define pl_bts(ptr, bit) ( \ |
| (sizeof(long) == 8 && sizeof(*(ptr)) == 8) ? ({ \ |
| unsigned long ret; \ |
| asm volatile("lock btsq %2, %0\n\t" \ |
| "sbb %1, %1\n\t" \ |
| : "+m" (*(ptr)), "=r" (ret) \ |
| : "Ir" ((unsigned long)(bit)) \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : (sizeof(*(ptr)) == 4) ? ({ \ |
| unsigned int ret; \ |
| asm volatile("lock btsl %2, %0\n\t" \ |
| "sbb %1, %1\n\t" \ |
| : "+m" (*(ptr)), "=r" (ret) \ |
| : "Ir" ((unsigned int)(bit)) \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : (sizeof(*(ptr)) == 2) ? ({ \ |
| unsigned short ret; \ |
| asm volatile("lock btsw %2, %0\n\t" \ |
| "sbb %1, %1\n\t" \ |
| : "+m" (*(ptr)), "=r" (ret) \ |
| : "Ir" ((unsigned short)(bit)) \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : ({ \ |
| void __unsupported_argument_size_for_pl_bts__(char *,int); \ |
| if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \ |
| sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \ |
| __unsupported_argument_size_for_pl_bts__(__FILE__,__LINE__); \ |
| 0; \ |
| }) \ |
| ) |
| |
| /* Note: for an unclear reason, gcc's __sync_fetch_and_add() implementation |
| * produces less optimal than hand-crafted asm code so let's implement here the |
| * operations we need for the most common archs. |
| */ |
| |
| /* fetch-and-add: fetch integer value pointed to by pointer <ptr>, add <x> to |
| * to <*ptr> and return the previous value. |
| */ |
| #define pl_xadd(ptr, x) ( \ |
| (sizeof(long) == 8 && sizeof(*(ptr)) == 8) ? ({ \ |
| unsigned long ret = (unsigned long)(x); \ |
| asm volatile("lock xaddq %0, %1\n" \ |
| : "=r" (ret), "+m" (*(ptr)) \ |
| : "0" (ret) \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : (sizeof(*(ptr)) == 4) ? ({ \ |
| unsigned int ret = (unsigned int)(x); \ |
| asm volatile("lock xaddl %0, %1\n" \ |
| : "=r" (ret), "+m" (*(ptr)) \ |
| : "0" (ret) \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : (sizeof(*(ptr)) == 2) ? ({ \ |
| unsigned short ret = (unsigned short)(x); \ |
| asm volatile("lock xaddw %0, %1\n" \ |
| : "=r" (ret), "+m" (*(ptr)) \ |
| : "0" (ret) \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : (sizeof(*(ptr)) == 1) ? ({ \ |
| unsigned char ret = (unsigned char)(x); \ |
| asm volatile("lock xaddb %0, %1\n" \ |
| : "=r" (ret), "+m" (*(ptr)) \ |
| : "0" (ret) \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : ({ \ |
| void __unsupported_argument_size_for_pl_xadd__(char *,int); \ |
| if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \ |
| sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \ |
| __unsupported_argument_size_for_pl_xadd__(__FILE__,__LINE__); \ |
| 0; \ |
| }) \ |
| ) |
| |
| /* exchange value <x> with integer value pointed to by pointer <ptr>, and return |
| * previous <*ptr> value. <x> must be of the same size as <*ptr>. |
| */ |
| #define pl_xchg(ptr, x) ( \ |
| (sizeof(long) == 8 && sizeof(*(ptr)) == 8) ? ({ \ |
| unsigned long ret = (unsigned long)(x); \ |
| asm volatile("xchgq %0, %1\n" \ |
| : "=r" (ret), "+m" (*(ptr)) \ |
| : "0" (ret) \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : (sizeof(*(ptr)) == 4) ? ({ \ |
| unsigned int ret = (unsigned int)(x); \ |
| asm volatile("xchgl %0, %1\n" \ |
| : "=r" (ret), "+m" (*(ptr)) \ |
| : "0" (ret) \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : (sizeof(*(ptr)) == 2) ? ({ \ |
| unsigned short ret = (unsigned short)(x); \ |
| asm volatile("xchgw %0, %1\n" \ |
| : "=r" (ret), "+m" (*(ptr)) \ |
| : "0" (ret) \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : (sizeof(*(ptr)) == 1) ? ({ \ |
| unsigned char ret = (unsigned char)(x); \ |
| asm volatile("xchgb %0, %1\n" \ |
| : "=r" (ret), "+m" (*(ptr)) \ |
| : "0" (ret) \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : ({ \ |
| void __unsupported_argument_size_for_pl_xchg__(char *,int); \ |
| if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \ |
| sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \ |
| __unsupported_argument_size_for_pl_xchg__(__FILE__,__LINE__); \ |
| 0; \ |
| }) \ |
| ) |
| |
| /* compare integer value <*ptr> with <old> and exchange it with <new> if |
| * it matches, and return <old>. <old> and <new> must be of the same size as |
| * <*ptr>. |
| */ |
| #define pl_cmpxchg(ptr, old, new) ( \ |
| (sizeof(long) == 8 && sizeof(*(ptr)) == 8) ? ({ \ |
| unsigned long ret; \ |
| asm volatile("lock cmpxchgq %2,%1" \ |
| : "=a" (ret), "+m" (*(ptr)) \ |
| : "r" ((unsigned long)(new)), \ |
| "0" ((unsigned long)(old)) \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : (sizeof(*(ptr)) == 4) ? ({ \ |
| unsigned int ret; \ |
| asm volatile("lock cmpxchgl %2,%1" \ |
| : "=a" (ret), "+m" (*(ptr)) \ |
| : "r" ((unsigned int)(new)), \ |
| "0" ((unsigned int)(old)) \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : (sizeof(*(ptr)) == 2) ? ({ \ |
| unsigned short ret; \ |
| asm volatile("lock cmpxchgw %2,%1" \ |
| : "=a" (ret), "+m" (*(ptr)) \ |
| : "r" ((unsigned short)(new)), \ |
| "0" ((unsigned short)(old)) \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : (sizeof(*(ptr)) == 1) ? ({ \ |
| unsigned char ret; \ |
| asm volatile("lock cmpxchgb %2,%1" \ |
| : "=a" (ret), "+m" (*(ptr)) \ |
| : "r" ((unsigned char)(new)), \ |
| "0" ((unsigned char)(old)) \ |
| : "cc"); \ |
| ret; /* return value */ \ |
| }) : ({ \ |
| void __unsupported_argument_size_for_pl_cmpxchg__(char *,int); \ |
| if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \ |
| sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \ |
| __unsupported_argument_size_for_pl_cmpxchg__(__FILE__,__LINE__); \ |
| 0; \ |
| }) \ |
| ) |
| |
| #else |
| /* generic implementations */ |
| |
| #if defined(__aarch64__) |
| |
| /* This was shown to improve fairness on modern ARMv8 such as Neoverse N1 */ |
| #define pl_cpu_relax() do { \ |
| asm volatile("isb" ::: "memory"); \ |
| } while (0) |
| |
| #else |
| |
| #define pl_cpu_relax() do { \ |
| asm volatile(""); \ |
| } while (0) |
| |
| #endif |
| |
| /* full memory barrier */ |
| #define pl_mb() do { \ |
| __sync_synchronize(); \ |
| } while (0) |
| |
| #define pl_inc_noret(ptr) ({ __sync_add_and_fetch((ptr), 1); }) |
| #define pl_dec_noret(ptr) ({ __sync_sub_and_fetch((ptr), 1); }) |
| #define pl_inc(ptr) ({ __sync_add_and_fetch((ptr), 1); }) |
| #define pl_dec(ptr) ({ __sync_sub_and_fetch((ptr), 1); }) |
| #define pl_add(ptr, x) ({ __sync_add_and_fetch((ptr), (x)); }) |
| #define pl_and(ptr, x) ({ __sync_and_and_fetch((ptr), (x)); }) |
| #define pl_or(ptr, x) ({ __sync_or_and_fetch((ptr), (x)); }) |
| #define pl_xor(ptr, x) ({ __sync_xor_and_fetch((ptr), (x)); }) |
| #define pl_sub(ptr, x) ({ __sync_sub_and_fetch((ptr), (x)); }) |
| #define pl_bts(ptr, bit) ({ typeof(*(ptr)) __pl_t = (1u << (bit)); \ |
| __sync_fetch_and_or((ptr), __pl_t) & __pl_t; \ |
| }) |
| #define pl_xadd(ptr, x) ({ __sync_fetch_and_add((ptr), (x)); }) |
| #define pl_cmpxchg(ptr, o, n) ({ __sync_val_compare_and_swap((ptr), (o), (n)); }) |
| #define pl_xchg(ptr, x) ({ typeof(*(ptr)) __pl_t; \ |
| do { __pl_t = *(ptr); \ |
| } while (!__sync_bool_compare_and_swap((ptr), __pl_t, (x))); \ |
| __pl_t; \ |
| }) |
| |
| #endif |
| |
| #endif /* PL_ATOMIC_OPS_H */ |