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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2005 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2010-2017 IBM Corporation. All rights reserved.
* Copyright (c) 2015-2018 Los Alamos National Security, LLC. All rights
* reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#ifndef OPAL_SYS_ARCH_ATOMIC_H
#define OPAL_SYS_ARCH_ATOMIC_H 1
/*
* On powerpc ...
*/
#define MB() __asm__ __volatile__ ("sync" : : : "memory")
#define RMB() __asm__ __volatile__ ("lwsync" : : : "memory")
#define WMB() __asm__ __volatile__ ("lwsync" : : : "memory")
#define ISYNC() __asm__ __volatile__ ("isync" : : : "memory")
/**********************************************************************
*
* Define constants for PowerPC 32
*
*********************************************************************/
#define OPAL_HAVE_ATOMIC_MEM_BARRIER 1
#define OPAL_HAVE_ATOMIC_COMPARE_EXCHANGE_32 1
#define OPAL_HAVE_ATOMIC_SWAP_32 1
#define OPAL_HAVE_ATOMIC_LLSC_32 1
#define OPAL_HAVE_ATOMIC_MATH_32 1
#define OPAL_HAVE_ATOMIC_ADD_32 1
#define OPAL_HAVE_ATOMIC_AND_32 1
#define OPAL_HAVE_ATOMIC_OR_32 1
#define OPAL_HAVE_ATOMIC_XOR_32 1
#define OPAL_HAVE_ATOMIC_SUB_32 1
#if (OPAL_ASSEMBLY_ARCH == OPAL_POWERPC64) || OPAL_ASM_SUPPORT_64BIT
#define OPAL_HAVE_ATOMIC_COMPARE_EXCHANGE_64 1
#define OPAL_HAVE_ATOMIC_SWAP_64 1
#define OPAL_HAVE_ATOMIC_LLSC_64 1
#define OPAL_HAVE_ATOMIC_MATH_64 1
#define OPAL_HAVE_ATOMIC_ADD_64 1
#define OPAL_HAVE_ATOMIC_AND_64 1
#define OPAL_HAVE_ATOMIC_OR_64 1
#define OPAL_HAVE_ATOMIC_XOR_64 1
#define OPAL_HAVE_ATOMIC_SUB_64 1
#endif
/**********************************************************************
*
* Memory Barriers
*
*********************************************************************/
#if OPAL_GCC_INLINE_ASSEMBLY
static inline
void opal_atomic_mb(void)
{
MB();
}
static inline
void opal_atomic_rmb(void)
{
RMB();
}
static inline
void opal_atomic_wmb(void)
{
WMB();
}
static inline
void opal_atomic_isync(void)
{
ISYNC();
}
#elif OPAL_XLC_INLINE_ASSEMBLY /* end OPAL_GCC_INLINE_ASSEMBLY */
/* Yeah, I don't know who thought this was a reasonable syntax for
* inline assembly. Do these because they are used so often and they
* are fairly simple (aka: there is a tech pub on IBM's web site
* containing the right hex for the instructions).
*/
#undef OPAL_HAVE_INLINE_ATOMIC_MEM_BARRIER
#define OPAL_HAVE_INLINE_ATOMIC_MEM_BARRIER 0
#pragma mc_func opal_atomic_mb { "7c0004ac" } /* sync */
#pragma reg_killed_by opal_atomic_mb /* none */
#pragma mc_func opal_atomic_rmb { "7c2004ac" } /* lwsync */
#pragma reg_killed_by opal_atomic_rmb /* none */
#pragma mc_func opal_atomic_wmb { "7c2004ac" } /* lwsync */
#pragma reg_killed_by opal_atomic_wmb /* none */
#endif
/**********************************************************************
*
* Atomic math operations
*
*********************************************************************/
#if OPAL_GCC_INLINE_ASSEMBLY
#ifdef __xlC__
/* work-around bizzare xlc bug in which it sign-extends
a pointer to a 32-bit signed integer */
#define OPAL_ASM_ADDR(a) ((uintptr_t)a)
#else
#define OPAL_ASM_ADDR(a) (a)
#endif
#if defined(__PGI)
/* work-around for bug in PGI 16.5-16.7 where the compiler fails to
* correctly emit load instructions for 64-bit operands. without this
* it will emit lwz instead of ld to load the 64-bit operand. */
#define OPAL_ASM_VALUE64(x) (void *)(intptr_t) (x)
#else
#define OPAL_ASM_VALUE64(x) x
#endif
static inline bool opal_atomic_compare_exchange_strong_32 (volatile int32_t *addr, int32_t *oldval, int32_t newval)
{
int32_t prev;
bool ret;
__asm__ __volatile__ (
"1: lwarx %0, 0, %2 \n\t"
" cmpw 0, %0, %3 \n\t"
" bne- 2f \n\t"
" stwcx. %4, 0, %2 \n\t"
" bne- 1b \n\t"
"2:"
: "=&r" (prev), "=m" (*addr)
: "r" OPAL_ASM_ADDR(addr), "r" (*oldval), "r" (newval), "m" (*addr)
: "cc", "memory");
ret = (prev == *oldval);
*oldval = prev;
return ret;
}
/* NTH: the LL/SC support is done through macros due to issues with non-optimized builds. The reason
* is that even with an always_inline attribute the compiler may still emit instructions to store then
* load the arguments to/from the stack. This sequence may cause the ll reservation to be cancelled. */
#define opal_atomic_ll_32(addr, ret) \
do { \
volatile int32_t *_addr = (addr); \
int32_t _ret; \
__asm__ __volatile__ ("lwarx %0, 0, %1 \n\t" \
: "=&r" (_ret) \
: "r" (_addr) \
); \
ret = (typeof(ret)) _ret; \
} while (0)
#define opal_atomic_sc_32(addr, value, ret) \
do { \
volatile int32_t *_addr = (addr); \
int32_t _ret, _foo, _newval = (int32_t) value; \
\
__asm__ __volatile__ (" stwcx. %4, 0, %3 \n\t" \
" li %0,0 \n\t" \
" bne- 1f \n\t" \
" ori %0,%0,1 \n\t" \
"1:" \
: "=r" (_ret), "=m" (*_addr), "=r" (_foo) \
: "r" (_addr), "r" (_newval) \
: "cc", "memory"); \
ret = _ret; \
} while (0)
/* these two functions aren't inlined in the non-gcc case because then
there would be two function calls (since neither cmpset_32 nor
atomic_?mb can be inlined). Instead, we "inline" them by hand in
the assembly, meaning there is one function call overhead instead
of two */
static inline bool opal_atomic_compare_exchange_strong_acq_32 (volatile int32_t *addr, int32_t *oldval, int32_t newval)
{
bool rc;
rc = opal_atomic_compare_exchange_strong_32 (addr, oldval, newval);
opal_atomic_rmb();
return rc;
}
static inline bool opal_atomic_compare_exchange_strong_rel_32 (volatile int32_t *addr, int32_t *oldval, int32_t newval)
{
opal_atomic_wmb();
return opal_atomic_compare_exchange_strong_32 (addr, oldval, newval);
}
static inline int32_t opal_atomic_swap_32(volatile int32_t *addr, int32_t newval)
{
int32_t ret;
__asm__ __volatile__ ("1: lwarx %0, 0, %2 \n\t"
" stwcx. %3, 0, %2 \n\t"
" bne- 1b \n\t"
: "=&r" (ret), "=m" (*addr)
: "r" (addr), "r" (newval)
: "cc", "memory");
return ret;
}
#endif /* OPAL_GCC_INLINE_ASSEMBLY */
#if (OPAL_ASSEMBLY_ARCH == OPAL_POWERPC64)
#if OPAL_GCC_INLINE_ASSEMBLY
#define OPAL_ATOMIC_POWERPC_DEFINE_ATOMIC_64(type, instr) \
static inline int64_t opal_atomic_fetch_ ## type ## _64(volatile int64_t* v, int64_t val) \
{ \
int64_t t, old; \
\
__asm__ __volatile__( \
"1: ldarx %1, 0, %4 \n\t" \
" " #instr " %0, %3, %1 \n\t" \
" stdcx. %0, 0, %4 \n\t" \
" bne- 1b \n\t" \
: "=&r" (t), "=&r" (old), "=m" (*v) \
: "r" (OPAL_ASM_VALUE64(val)), "r" OPAL_ASM_ADDR(v), "m" (*v) \
: "cc"); \
\
return old; \
}
OPAL_ATOMIC_POWERPC_DEFINE_ATOMIC_64(add, add)
OPAL_ATOMIC_POWERPC_DEFINE_ATOMIC_64(and, and)
OPAL_ATOMIC_POWERPC_DEFINE_ATOMIC_64(or, or)
OPAL_ATOMIC_POWERPC_DEFINE_ATOMIC_64(xor, xor)
OPAL_ATOMIC_POWERPC_DEFINE_ATOMIC_64(sub, subf)
static inline bool opal_atomic_compare_exchange_strong_64 (volatile int64_t *addr, int64_t *oldval, int64_t newval)
{
int64_t prev;
bool ret;
__asm__ __volatile__ (
"1: ldarx %0, 0, %2 \n\t"
" cmpd 0, %0, %3 \n\t"
" bne- 2f \n\t"
" stdcx. %4, 0, %2 \n\t"
" bne- 1b \n\t"
"2:"
: "=&r" (prev), "=m" (*addr)
: "r" (addr), "r" (OPAL_ASM_VALUE64(*oldval)), "r" (OPAL_ASM_VALUE64(newval)), "m" (*addr)
: "cc", "memory");
ret = (prev == *oldval);
*oldval = prev;
return ret;
}
#define opal_atomic_ll_64(addr, ret) \
do { \
volatile int64_t *_addr = (addr); \
int64_t _ret; \
__asm__ __volatile__ ("ldarx %0, 0, %1 \n\t" \
: "=&r" (_ret) \
: "r" (_addr) \
); \
ret = (typeof(ret)) _ret; \
} while (0)
#define opal_atomic_sc_64(addr, value, ret) \
do { \
volatile int64_t *_addr = (addr); \
int64_t _foo, _newval = (int64_t) value; \
int32_t _ret; \
\
__asm__ __volatile__ (" stdcx. %2, 0, %1 \n\t" \
" li %0,0 \n\t" \
" bne- 1f \n\t" \
" ori %0,%0,1 \n\t" \
"1:" \
: "=r" (_ret) \
: "r" (_addr), "r" (OPAL_ASM_VALUE64(_newval)) \
: "cc", "memory"); \
ret = _ret; \
} while (0)
static inline int64_t opal_atomic_swap_64(volatile int64_t *addr, int64_t newval)
{
int64_t ret;
__asm__ __volatile__ ("1: ldarx %0, 0, %2 \n\t"
" stdcx. %3, 0, %2 \n\t"
" bne- 1b \n\t"
: "=&r" (ret), "=m" (*addr)
: "r" (addr), "r" (OPAL_ASM_VALUE64(newval))
: "cc", "memory");
return ret;
}
#endif /* OPAL_GCC_INLINE_ASSEMBLY */
#elif (OPAL_ASSEMBLY_ARCH == OPAL_POWERPC32) && OPAL_ASM_SUPPORT_64BIT
#ifndef ll_low /* GLIBC provides these somewhere, so protect */
#define ll_low(x) *(((unsigned int*)&(x))+0)
#define ll_high(x) *(((unsigned int*)&(x))+1)
#endif
#if OPAL_GCC_INLINE_ASSEMBLY
static inline bool opal_atomic_compare_exchange_strong_64 (volatile int64_t *addr, int64_t *oldval, int64_t newval)
{
int64_t prev;
int ret;
/*
* We force oldval and newval into memory because PPC doesn't
* appear to have a way to do a move register with offset. Since
* this is 32-bit code, a 64 bit integer will be loaded into two
* registers (assuming no inlining, addr will be in r3, oldval
* will be in r4 and r5, and newval will be r6 and r7. We need
* to load the whole thing into one register. So we have the
* compiler push the values into memory and load the double word
* into registers. We use r4,r5 so that the main block of code
* is very similar to the pure 64 bit version.
*/
__asm__ __volatile__ (
"ld r4,%3 \n\t"
"ld r5,%4 \n\t"
"1: ldarx %1, 0, %2 \n\t"
" cmpd 0, %1, r4 \n\t"
" bne- 2f \n\t"
" stdcx. r5, 0, %2 \n\t"
" bne- 1b \n\t"
"2: \n\t"
"xor r5,r4,%1 \n\t"
"subfic r9,r5,0 \n\t"
"adde %0,r9,r5 \n\t"
: "=&r" (ret), "+r" (prev)
: "r"OPAL_ASM_ADDR(addr),
"m"(*oldval), "m"(newval)
: "r4", "r5", "r9", "cc", "memory");
*oldval = prev;
return (bool) ret;
}
#endif /* OPAL_GCC_INLINE_ASSEMBLY */
#endif /* OPAL_ASM_SUPPORT_64BIT */
#if OPAL_GCC_INLINE_ASSEMBLY
/* these two functions aren't inlined in the non-gcc case because then
there would be two function calls (since neither cmpset_64 nor
atomic_?mb can be inlined). Instead, we "inline" them by hand in
the assembly, meaning there is one function call overhead instead
of two */
static inline bool opal_atomic_compare_exchange_strong_acq_64 (volatile int64_t *addr, int64_t *oldval, int64_t newval)
{
bool rc;
rc = opal_atomic_compare_exchange_strong_64 (addr, oldval, newval);
opal_atomic_rmb();
return rc;
}
static inline bool opal_atomic_compare_exchange_strong_rel_64 (volatile int64_t *addr, int64_t *oldval, int64_t newval)
{
opal_atomic_wmb();
return opal_atomic_compare_exchange_strong_64 (addr, oldval, newval);
}
#define OPAL_ATOMIC_POWERPC_DEFINE_ATOMIC_32(type, instr) \
static inline int32_t opal_atomic_fetch_ ## type ## _32(volatile int32_t* v, int val) \
{ \
int32_t t, old; \
\
__asm__ __volatile__( \
"1: lwarx %1, 0, %4 \n\t" \
" " #instr " %0, %3, %1 \n\t" \
" stwcx. %0, 0, %4 \n\t" \
" bne- 1b \n\t" \
: "=&r" (t), "=&r" (old), "=m" (*v) \
: "r" (val), "r" OPAL_ASM_ADDR(v), "m" (*v) \
: "cc"); \
\
return old; \
}
OPAL_ATOMIC_POWERPC_DEFINE_ATOMIC_32(add, add)
OPAL_ATOMIC_POWERPC_DEFINE_ATOMIC_32(and, and)
OPAL_ATOMIC_POWERPC_DEFINE_ATOMIC_32(or, or)
OPAL_ATOMIC_POWERPC_DEFINE_ATOMIC_32(xor, xor)
OPAL_ATOMIC_POWERPC_DEFINE_ATOMIC_32(sub, subf)
#endif /* OPAL_GCC_INLINE_ASSEMBLY */
#endif /* ! OPAL_SYS_ARCH_ATOMIC_H */
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