/*
* Copyright 2009-2015 Samy Al Bahra.
* Copyright 2011 Devon H. O'Dell <devon.odell@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef CK_PR_X86_H
#define CK_PR_X86_H
#ifndef CK_PR_H
#error Do not include this file directly, use ck_pr.h
#endif
#include <ck_cc.h>
#include <ck_md.h>
#include <ck_stdint.h>
/*
* The following represent supported atomic operations.
* These operations may be emulated.
*/
#include "ck_f_pr.h"
/* Minimum requirements for the CK_PR interface are met. */
#define CK_F_PR
/*
* Prevent speculative execution in busy-wait loops (P4 <=) or "predefined
* delay".
*/
CK_CC_INLINE static void
ck_pr_stall(void)
{
__asm__ __volatile__("pause" ::: "memory");
return;
}
#ifdef CK_MD_UMP
#define CK_PR_LOCK_PREFIX
#define CK_PR_FENCE(T, I) \
CK_CC_INLINE static void \
ck_pr_fence_strict_##T(void) \
{ \
__asm__ __volatile__("" ::: "memory"); \
return; \
}
#else
#define CK_PR_LOCK_PREFIX "lock "
#define CK_PR_FENCE(T, I) \
CK_CC_INLINE static void \
ck_pr_fence_strict_##T(void) \
{ \
__asm__ __volatile__(I ::: "memory"); \
return; \
}
#endif /* CK_MD_UMP */
#if defined(CK_MD_SSE_DISABLE)
/* If SSE is disabled, then use atomic operations for serialization. */
#define CK_MD_X86_MFENCE "lock addl $0, (%%esp)"
#define CK_MD_X86_SFENCE CK_MD_X86_MFENCE
#define CK_MD_X86_LFENCE CK_MD_X86_MFENCE
#else
#define CK_MD_X86_SFENCE "sfence"
#define CK_MD_X86_LFENCE "lfence"
#define CK_MD_X86_MFENCE "mfence"
#endif /* !CK_MD_SSE_DISABLE */
CK_PR_FENCE(atomic, "")
CK_PR_FENCE(atomic_store, "")
CK_PR_FENCE(atomic_load, "")
CK_PR_FENCE(store_atomic, "")
CK_PR_FENCE(load_atomic, "")
CK_PR_FENCE(load, CK_MD_X86_LFENCE)
CK_PR_FENCE(load_store, CK_MD_X86_MFENCE)
CK_PR_FENCE(store, CK_MD_X86_SFENCE)
CK_PR_FENCE(store_load, CK_MD_X86_MFENCE)
CK_PR_FENCE(memory, CK_MD_X86_MFENCE)
CK_PR_FENCE(release, CK_MD_X86_MFENCE)
CK_PR_FENCE(acquire, CK_MD_X86_MFENCE)
CK_PR_FENCE(acqrel, CK_MD_X86_MFENCE)
CK_PR_FENCE(lock, CK_MD_X86_MFENCE)
CK_PR_FENCE(unlock, CK_MD_X86_MFENCE)
#undef CK_PR_FENCE
/*
* Atomic fetch-and-store operations.
*/
#define CK_PR_FAS(S, M, T, C, I) \
CK_CC_INLINE static T \
ck_pr_fas_##S(M *target, T v) \
{ \
__asm__ __volatile__(I " %0, %1" \
: "+m" (*(C *)target), \
"+q" (v) \
: \
: "memory"); \
return v; \
}
CK_PR_FAS(ptr, void, void *, char, "xchgl")
#define CK_PR_FAS_S(S, T, I) CK_PR_FAS(S, T, T, T, I)
CK_PR_FAS_S(char, char, "xchgb")
CK_PR_FAS_S(uint, unsigned int, "xchgl")
CK_PR_FAS_S(int, int, "xchgl")
CK_PR_FAS_S(32, uint32_t, "xchgl")
CK_PR_FAS_S(16, uint16_t, "xchgw")
CK_PR_FAS_S(8, uint8_t, "xchgb")
#undef CK_PR_FAS_S
#undef CK_PR_FAS
#define CK_PR_LOAD(S, M, T, C, I) \
CK_CC_INLINE static T \
ck_pr_md_load_##S(const M *target) \
{ \
T r; \
__asm__ __volatile__(I " %1, %0" \
: "=q" (r) \
: "m" (*(const C *)target) \
: "memory"); \
return (r); \
}
CK_PR_LOAD(ptr, void, void *, char, "movl")
#define CK_PR_LOAD_S(S, T, I) CK_PR_LOAD(S, T, T, T, I)
CK_PR_LOAD_S(char, char, "movb")
CK_PR_LOAD_S(uint, unsigned int, "movl")
CK_PR_LOAD_S(int, int, "movl")
CK_PR_LOAD_S(32, uint32_t, "movl")
CK_PR_LOAD_S(16, uint16_t, "movw")
CK_PR_LOAD_S(8, uint8_t, "movb")
#undef CK_PR_LOAD_S
#undef CK_PR_LOAD
#define CK_PR_STORE(S, M, T, C, I) \
CK_CC_INLINE static void \
ck_pr_md_store_##S(M *target, T v) \
{ \
__asm__ __volatile__(I " %1, %0" \
: "=m" (*(C *)target) \
: CK_CC_IMM "q" (v) \
: "memory"); \
return; \
}
CK_PR_STORE(ptr, void, const void *, char, "movl")
#define CK_PR_STORE_S(S, T, I) CK_PR_STORE(S, T, T, T, I)
CK_PR_STORE_S(char, char, "movb")
CK_PR_STORE_S(uint, unsigned int, "movl")
CK_PR_STORE_S(int, int, "movl")
CK_PR_STORE_S(32, uint32_t, "movl")
CK_PR_STORE_S(16, uint16_t, "movw")
CK_PR_STORE_S(8, uint8_t, "movb")
#undef CK_PR_STORE_S
#undef CK_PR_STORE
/*
* Atomic fetch-and-add operations.
*/
#define CK_PR_FAA(S, M, T, C, I) \
CK_CC_INLINE static T \
ck_pr_faa_##S(M *target, T d) \
{ \
__asm__ __volatile__(CK_PR_LOCK_PREFIX I " %1, %0" \
: "+m" (*(C *)target), \
"+q" (d) \
: \
: "memory", "cc"); \
return (d); \
}
CK_PR_FAA(ptr, void, uintptr_t, char, "xaddl")
#define CK_PR_FAA_S(S, T, I) CK_PR_FAA(S, T, T, T, I)
CK_PR_FAA_S(char, char, "xaddb")
CK_PR_FAA_S(uint, unsigned int, "xaddl")
CK_PR_FAA_S(int, int, "xaddl")
CK_PR_FAA_S(32, uint32_t, "xaddl")
CK_PR_FAA_S(16, uint16_t, "xaddw")
CK_PR_FAA_S(8, uint8_t, "xaddb")
#undef CK_PR_FAA_S
#undef CK_PR_FAA
/*
* Atomic store-only unary operations.
*/
#define CK_PR_UNARY(K, S, T, C, I) \
CK_PR_UNARY_R(K, S, T, C, I) \
CK_PR_UNARY_V(K, S, T, C, I)
#define CK_PR_UNARY_R(K, S, T, C, I) \
CK_CC_INLINE static void \
ck_pr_##K##_##S(T *target) \
{ \
__asm__ __volatile__(CK_PR_LOCK_PREFIX I " %0" \
: "+m" (*(C *)target) \
: \
: "memory", "cc"); \
return; \
}
#define CK_PR_UNARY_V(K, S, T, C, I) \
CK_CC_INLINE static bool \
ck_pr_##K##_##S##_is_zero(T *target) \
{ \
bool ret; \
__asm__ __volatile__(CK_PR_LOCK_PREFIX I " %0; setz %1" \
: "+m" (*(C *)target), \
"=rm" (ret) \
: \
: "memory", "cc"); \
return ret; \
}
#define CK_PR_UNARY_S(K, S, T, I) CK_PR_UNARY(K, S, T, T, I)
#define CK_PR_GENERATE(K) \
CK_PR_UNARY(K, ptr, void, char, #K "l") \
CK_PR_UNARY_S(K, char, char, #K "b") \
CK_PR_UNARY_S(K, int, int, #K "l") \
CK_PR_UNARY_S(K, uint, unsigned int, #K "l") \
CK_PR_UNARY_S(K, 32, uint32_t, #K "l") \
CK_PR_UNARY_S(K, 16, uint16_t, #K "w") \
CK_PR_UNARY_S(K, 8, uint8_t, #K "b")
CK_PR_GENERATE(inc)
CK_PR_GENERATE(dec)
CK_PR_GENERATE(neg)
/* not does not affect condition flags. */
#undef CK_PR_UNARY_V
#define CK_PR_UNARY_V(a, b, c, d, e)
CK_PR_GENERATE(not)
#undef CK_PR_GENERATE
#undef CK_PR_UNARY_S
#undef CK_PR_UNARY_V
#undef CK_PR_UNARY_R
#undef CK_PR_UNARY
/*
* Atomic store-only binary operations.
*/
#define CK_PR_BINARY(K, S, M, T, C, I) \
CK_CC_INLINE static void \
ck_pr_##K##_##S(M *target, T d) \
{ \
__asm__ __volatile__(CK_PR_LOCK_PREFIX I " %1, %0" \
: "+m" (*(C *)target) \
: CK_CC_IMM "q" (d) \
: "memory", "cc"); \
return; \
}
#define CK_PR_BINARY_S(K, S, T, I) CK_PR_BINARY(K, S, T, T, T, I)
#define CK_PR_GENERATE(K) \
CK_PR_BINARY(K, ptr, void, uintptr_t, char, #K "l") \
CK_PR_BINARY_S(K, char, char, #K "b") \
CK_PR_BINARY_S(K, int, int, #K "l") \
CK_PR_BINARY_S(K, uint, unsigned int, #K "l") \
CK_PR_BINARY_S(K, 32, uint32_t, #K "l") \
CK_PR_BINARY_S(K, 16, uint16_t, #K "w") \
CK_PR_BINARY_S(K, 8, uint8_t, #K "b")
CK_PR_GENERATE(add)
CK_PR_GENERATE(sub)
CK_PR_GENERATE(and)
CK_PR_GENERATE(or)
CK_PR_GENERATE(xor)
#undef CK_PR_GENERATE
#undef CK_PR_BINARY_S
#undef CK_PR_BINARY
/*
* Atomic compare and swap.
*/
#define CK_PR_CAS(S, M, T, C, I) \
CK_CC_INLINE static bool \
ck_pr_cas_##S(M *target, T compare, T set) \
{ \
bool z; \
__asm__ __volatile__(CK_PR_LOCK_PREFIX I " %2, %0; setz %1" \
: "+m" (*(C *)target), \
"=a" (z) \
: "q" (set), \
"a" (compare) \
: "memory", "cc"); \
return z; \
}
CK_PR_CAS(ptr, void, void *, char, "cmpxchgl")
#define CK_PR_CAS_S(S, T, I) CK_PR_CAS(S, T, T, T, I)
CK_PR_CAS_S(char, char, "cmpxchgb")
CK_PR_CAS_S(int, int, "cmpxchgl")
CK_PR_CAS_S(uint, unsigned int, "cmpxchgl")
CK_PR_CAS_S(32, uint32_t, "cmpxchgl")
CK_PR_CAS_S(16, uint16_t, "cmpxchgw")
CK_PR_CAS_S(8, uint8_t, "cmpxchgb")
#undef CK_PR_CAS_S
#undef CK_PR_CAS
/*
* Compare and swap, set *v to old value of target.
*/
#define CK_PR_CAS_O(S, M, T, C, I, R) \
CK_CC_INLINE static bool \
ck_pr_cas_##S##_value(M *target, T compare, T set, M *v) \
{ \
bool z; \
__asm__ __volatile__(CK_PR_LOCK_PREFIX "cmpxchg" I " %3, %0;" \
"mov %% " R ", %2;" \
"setz %1;" \
: "+m" (*(C *)target), \
"=a" (z), \
"=m" (*(C *)v) \
: "q" (set), \
"a" (compare) \
: "memory", "cc"); \
return (bool)z; \
}
CK_PR_CAS_O(ptr, void, void *, char, "l", "eax")
#define CK_PR_CAS_O_S(S, T, I, R) \
CK_PR_CAS_O(S, T, T, T, I, R)
CK_PR_CAS_O_S(char, char, "b", "al")
CK_PR_CAS_O_S(int, int, "l", "eax")
CK_PR_CAS_O_S(uint, unsigned int, "l", "eax")
CK_PR_CAS_O_S(32, uint32_t, "l", "eax")
CK_PR_CAS_O_S(16, uint16_t, "w", "ax")
CK_PR_CAS_O_S(8, uint8_t, "b", "al")
#undef CK_PR_CAS_O_S
#undef CK_PR_CAS_O
/*
* Atomic bit test operations.
*/
#define CK_PR_BT(K, S, T, P, C, I) \
CK_CC_INLINE static bool \
ck_pr_##K##_##S(T *target, unsigned int b) \
{ \
bool c; \
__asm__ __volatile__(CK_PR_LOCK_PREFIX I "; setc %1" \
: "+m" (*(C *)target), \
"=q" (c) \
: "q" ((P)b) \
: "memory", "cc"); \
return (bool)c; \
}
#define CK_PR_BT_S(K, S, T, I) CK_PR_BT(K, S, T, T, T, I)
#define CK_PR_GENERATE(K) \
CK_PR_BT(K, ptr, void, uint32_t, char, #K "l %2, %0") \
CK_PR_BT_S(K, uint, unsigned int, #K "l %2, %0") \
CK_PR_BT_S(K, int, int, #K "l %2, %0") \
CK_PR_BT_S(K, 32, uint32_t, #K "l %2, %0") \
CK_PR_BT_S(K, 16, uint16_t, #K "w %w2, %0")
CK_PR_GENERATE(btc)
CK_PR_GENERATE(bts)
CK_PR_GENERATE(btr)
#undef CK_PR_GENERATE
#undef CK_PR_BT
#endif /* CK_PR_X86_H */
