/*
* Copyright 2009-2015 Samy Al Bahra.
* Copyright 2017 Neale Ferguson
* 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_S390X_H
#define CK_PR_S390X_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>
/*
* The following represent supported atomic operations.
* These operations may be emulated.
*/
#include "ck_f_pr.h"
/*
* Minimum interface requirement met.
*/
#define CK_F_PR
/*
* This bounces the hardware thread from low to medium
* priority. I am unsure of the benefits of this approach
* but it is used by the Linux kernel.
*/
CK_CC_INLINE static void
ck_pr_stall(void)
{
__sync_synchronize();
return;
}
#define CK_PR_FENCE(T) \
CK_CC_INLINE static void \
ck_pr_fence_strict_##T(void) \
{ \
__sync_synchronize(); \
}
/*
* These are derived from:
* http://www.ibm.com/developerworks/systems/articles/powerpc.html
*/
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(store)
CK_PR_FENCE(store_load)
CK_PR_FENCE(load)
CK_PR_FENCE(load_store)
CK_PR_FENCE(memory)
CK_PR_FENCE(acquire)
CK_PR_FENCE(release)
CK_PR_FENCE(acqrel)
CK_PR_FENCE(lock)
CK_PR_FENCE(unlock)
#undef CK_PR_FENCE
#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 "\t%0, %1\n" \
: "=r" (r) \
: "Q" (*(const C *)target) \
: "memory"); \
return (r); \
}
CK_PR_LOAD(ptr, void, void *, uint64_t, "lg")
#define CK_PR_LOAD_S(S, T, I) CK_PR_LOAD(S, T, T, T, I)
CK_PR_LOAD_S(64, uint64_t, "lg")
CK_PR_LOAD_S(32, uint32_t, "llgf")
CK_PR_LOAD_S(16, uint16_t, "llgh")
CK_PR_LOAD_S(8, uint8_t, "llgc")
CK_PR_LOAD_S(uint, unsigned int, "llgf")
CK_PR_LOAD_S(int, int, "llgf")
CK_PR_LOAD_S(short, short, "lgh")
CK_PR_LOAD_S(char, char, "lgb")
#ifndef CK_PR_DISABLE_DOUBLE
CK_CC_INLINE static double
ck_pr_md_load_double(const double *target)
{
double r;
__asm__ __volatile__("ld %0, %1\n"
: "=f" (r)
: "Q" (*(const double *)target)
: "memory");
return (r);
}
#endif
#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 "\t%1, %0\n" \
: "=Q" (*(C *)target) \
: "r" (v) \
: "memory"); \
return; \
}
CK_PR_STORE(ptr, void, const void *, uint64_t, "stg")
#define CK_PR_STORE_S(S, T, I) CK_PR_STORE(S, T, T, T, I)
CK_PR_STORE_S(64, uint64_t, "stg")
CK_PR_STORE_S(32, uint32_t, "st")
CK_PR_STORE_S(16, uint16_t, "sth")
CK_PR_STORE_S(8, uint8_t, "stc")
CK_PR_STORE_S(uint, unsigned int, "st")
CK_PR_STORE_S(int, int, "st")
CK_PR_STORE_S(short, short, "sth")
CK_PR_STORE_S(char, char, "stc")
#ifndef CK_PR_DISABLE_DOUBLE
CK_CC_INLINE static void
ck_pr_md_store_double(double *target, double v)
{
__asm__ __volatile__(" std %1, %0\n"
: "=Q" (*(double *)target)
: "f" (v)
: "0", "memory");
}
#endif
#undef CK_PR_STORE_S
#undef CK_PR_STORE
CK_CC_INLINE static bool
ck_pr_cas_64_value(uint64_t *target, uint64_t compare, uint64_t set, uint64_t *value)
{
*value = __sync_val_compare_and_swap(target,compare,set);
return (*value == compare);
}
CK_CC_INLINE static bool
ck_pr_cas_ptr_value(void *target, void *compare, void *set, void *value)
{
uintptr_t previous;
previous = __sync_val_compare_and_swap((uintptr_t *) target,
(uintptr_t) compare,
(uintptr_t) set);
*((uintptr_t *) value) = previous;
return (previous == (uintptr_t) compare);
}
CK_CC_INLINE static bool
ck_pr_cas_64(uint64_t *target, uint64_t compare, uint64_t set)
{
return(__sync_bool_compare_and_swap(target,compare,set));
}
CK_CC_INLINE static bool
ck_pr_cas_ptr(void *target, void *compare, void *set)
{
return(__sync_bool_compare_and_swap((uintptr_t *) target,
(uintptr_t) compare,
(uintptr_t) set));
}
#define CK_PR_CAS(N, T) \
CK_CC_INLINE static bool \
ck_pr_cas_##N##_value(T *target, T compare, T set, T *value) \
{ \
*value = __sync_val_compare_and_swap(target, \
compare, \
set); \
return(*value == compare); \
} \
CK_CC_INLINE static bool \
ck_pr_cas_##N(T *target, T compare, T set) \
{ \
return(__sync_bool_compare_and_swap(target, \
compare, \
set)); \
}
CK_PR_CAS(32, uint32_t)
CK_PR_CAS(uint, unsigned int)
CK_PR_CAS(int, int)
#undef CK_PR_CAS
CK_CC_INLINE static void *
ck_pr_fas_ptr(void *target, void *v)
{
return((void *)__atomic_exchange_n((uintptr_t *) target, (uintptr_t) v, __ATOMIC_ACQUIRE));
}
#define CK_PR_FAS(N, M, T) \
CK_CC_INLINE static T \
ck_pr_fas_##N(M *target, T v) \
{ \
return(__atomic_exchange_n(target, v, __ATOMIC_ACQUIRE)); \
}
CK_PR_FAS(64, uint64_t, uint64_t)
CK_PR_FAS(32, uint32_t, uint32_t)
CK_PR_FAS(int, int, int)
CK_PR_FAS(uint, unsigned int, unsigned int)
#ifndef CK_PR_DISABLE_DOUBLE
CK_CC_INLINE static double
ck_pr_fas_double(double *target, double *v)
{
double previous;
__asm__ __volatile__ (" lg 1,%2\n"
"0: lg 0,%1\n"
" csg 0,1,%1\n"
" jnz 0b\n"
" ldgr %0,0\n"
: "=f" (previous)
: "Q" (target), "Q" (v)
: "0", "1", "cc", "memory");
return (previous);
}
#endif
#undef CK_PR_FAS
/*
* Atomic store-only binary operations.
*/
#define CK_PR_BINARY(K, S, M, T) \
CK_CC_INLINE static void \
ck_pr_##K##_##S(M *target, T d) \
{ \
d = __sync_fetch_and_##K((T *)target, d); \
return; \
}
#define CK_PR_BINARY_S(K, S, T) CK_PR_BINARY(K, S, T, T)
#define CK_PR_GENERATE(K) \
CK_PR_BINARY(K, ptr, void, void *) \
CK_PR_BINARY_S(K, char, char) \
CK_PR_BINARY_S(K, int, int) \
CK_PR_BINARY_S(K, uint, unsigned int) \
CK_PR_BINARY_S(K, 64, uint64_t) \
CK_PR_BINARY_S(K, 32, uint32_t) \
CK_PR_BINARY_S(K, 16, uint16_t) \
CK_PR_BINARY_S(K, 8, uint8_t)
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
#define CK_PR_UNARY(S, M, T) \
CK_CC_INLINE static void \
ck_pr_inc_##S(M *target) \
{ \
ck_pr_add_##S(target, (T)1); \
return; \
} \
CK_CC_INLINE static void \
ck_pr_dec_##S(M *target) \
{ \
ck_pr_sub_##S(target, (T)1); \
return; \
}
#define CK_PR_UNARY_X(S, M) \
CK_CC_INLINE static void \
ck_pr_not_##S(M *target) \
{ \
M newval; \
do { \
newval = ~(*target); \
} while (!__sync_bool_compare_and_swap(target, \
*target, \
newval)); \
} \
CK_CC_INLINE static void \
ck_pr_neg_##S(M *target) \
{ \
M newval; \
do { \
newval = -(*target); \
} while (!__sync_bool_compare_and_swap(target, \
*target, \
newval)); \
}
#define CK_PR_UNARY_S(S, M) CK_PR_UNARY(S, M, M) \
CK_PR_UNARY_X(S, M)
CK_PR_UNARY(ptr, void, void *)
CK_PR_UNARY_S(char, char)
CK_PR_UNARY_S(int, int)
CK_PR_UNARY_S(uint, unsigned int)
CK_PR_UNARY_S(64, uint64_t)
CK_PR_UNARY_S(32, uint32_t)
CK_PR_UNARY_S(16, uint16_t)
CK_PR_UNARY_S(8, uint8_t)
#undef CK_PR_UNARY_S
#undef CK_PR_UNARY
CK_CC_INLINE static void *
ck_pr_faa_ptr(void *target, uintptr_t delta)
{
uintptr_t previous;
previous = __sync_fetch_and_add((uintptr_t *) target, delta);
return (void *)(previous);
}
#define CK_PR_FAA(S, T) \
CK_CC_INLINE static T \
ck_pr_faa_##S(T *target, T delta) \
{ \
T previous; \
\
previous = __sync_fetch_and_add(target, delta); \
\
return (previous); \
}
CK_PR_FAA(64, uint64_t)
CK_PR_FAA(32, uint32_t)
CK_PR_FAA(uint, unsigned int)
CK_PR_FAA(int, int)
#undef CK_PR_FAA
#endif /* CK_PR_S390X_H */