/*
* Copyright 2009-2015 Samy Al Bahra.
* Copyright 2012 João Fernandes.
* 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_PPC_H
#define CK_PR_PPC_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)
{
__asm__ __volatile__("or 1, 1, 1;"
"or 2, 2, 2;" ::: "memory");
return;
}
#define CK_PR_FENCE(T, I) \
CK_CC_INLINE static void \
ck_pr_fence_strict_##T(void) \
{ \
__asm__ __volatile__(I ::: "memory"); \
}
CK_PR_FENCE(atomic, "lwsync")
CK_PR_FENCE(atomic_store, "lwsync")
CK_PR_FENCE(atomic_load, "sync")
CK_PR_FENCE(store_atomic, "lwsync")
CK_PR_FENCE(load_atomic, "lwsync")
CK_PR_FENCE(store, "lwsync")
CK_PR_FENCE(store_load, "sync")
CK_PR_FENCE(load, "lwsync")
CK_PR_FENCE(load_store, "lwsync")
CK_PR_FENCE(memory, "sync")
CK_PR_FENCE(acquire, "lwsync")
CK_PR_FENCE(release, "lwsync")
CK_PR_FENCE(acqrel, "lwsync")
CK_PR_FENCE(lock, "lwsync")
CK_PR_FENCE(unlock, "lwsync")
#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 "%U1%X1 %0, %1" \
: "=r" (r) \
: "m" (*(const C *)target) \
: "memory"); \
return (r); \
}
CK_PR_LOAD(ptr, void, void *, uint32_t, "lwz")
#define CK_PR_LOAD_S(S, T, I) CK_PR_LOAD(S, T, T, T, I)
CK_PR_LOAD_S(32, uint32_t, "lwz")
CK_PR_LOAD_S(16, uint16_t, "lhz")
CK_PR_LOAD_S(8, uint8_t, "lbz")
CK_PR_LOAD_S(uint, unsigned int, "lwz")
CK_PR_LOAD_S(int, int, "lwz")
CK_PR_LOAD_S(short, short, "lhz")
CK_PR_LOAD_S(char, char, "lbz")
#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 "%U0%X0 %1, %0" \
: "=m" (*(C *)target) \
: "r" (v) \
: "memory"); \
return; \
}
CK_PR_STORE(ptr, void, const void *, uint32_t, "stw")
#define CK_PR_STORE_S(S, T, I) CK_PR_STORE(S, T, T, T, I)
CK_PR_STORE_S(32, uint32_t, "stw")
CK_PR_STORE_S(16, uint16_t, "sth")
CK_PR_STORE_S(8, uint8_t, "stb")
CK_PR_STORE_S(uint, unsigned int, "stw")
CK_PR_STORE_S(int, int, "stw")
CK_PR_STORE_S(short, short, "sth")
CK_PR_STORE_S(char, char, "stb")
#undef CK_PR_STORE_S
#undef CK_PR_STORE
#define CK_PR_CAS(N, T, M) \
CK_CC_INLINE static bool \
ck_pr_cas_##N##_value(M *target, T compare, T set, M *value) \
{ \
T previous; \
__asm__ __volatile__("1:" \
"lwarx %0, 0, %1;" \
"cmpw 0, %0, %3;" \
"bne- 2f;" \
"stwcx. %2, 0, %1;" \
"bne- 1b;" \
"2:" \
: "=&r" (previous) \
: "r" (target), \
"r" (set), \
"r" (compare) \
: "memory", "cc"); \
*(T *)value = previous; \
return (previous == compare); \
} \
CK_CC_INLINE static bool \
ck_pr_cas_##N(M *target, T compare, T set) \
{ \
T previous; \
__asm__ __volatile__("1:" \
"lwarx %0, 0, %1;" \
"cmpw 0, %0, %3;" \
"bne- 2f;" \
"stwcx. %2, 0, %1;" \
"bne- 1b;" \
"2:" \
: "=&r" (previous) \
: "r" (target), \
"r" (set), \
"r" (compare) \
: "memory", "cc"); \
return (previous == compare); \
}
CK_PR_CAS(ptr, void *, void)
#define CK_PR_CAS_S(a, b) CK_PR_CAS(a, b, b)
CK_PR_CAS_S(32, uint32_t)
CK_PR_CAS_S(uint, unsigned int)
CK_PR_CAS_S(int, int)
#undef CK_PR_CAS_S
#undef CK_PR_CAS
#define CK_PR_FAS(N, M, T, W) \
CK_CC_INLINE static T \
ck_pr_fas_##N(M *target, T v) \
{ \
T previous; \
__asm__ __volatile__("1:" \
"l" W "arx %0, 0, %1;" \
"st" W "cx. %2, 0, %1;" \
"bne- 1b;" \
: "=&r" (previous) \
: "r" (target), \
"r" (v) \
: "memory", "cc"); \
return (previous); \
}
CK_PR_FAS(32, uint32_t, uint32_t, "w")
CK_PR_FAS(ptr, void, void *, "w")
CK_PR_FAS(int, int, int, "w")
CK_PR_FAS(uint, unsigned int, unsigned int, "w")
#undef CK_PR_FAS
#define CK_PR_UNARY(O, N, M, T, I, W) \
CK_CC_INLINE static void \
ck_pr_##O##_##N(M *target) \
{ \
T previous; \
__asm__ __volatile__("1:" \
"l" W "arx %0, 0, %1;" \
I ";" \
"st" W "cx. %0, 0, %1;" \
"bne- 1b;" \
: "=&r" (previous) \
: "r" (target) \
: "memory", "cc"); \
return; \
}
CK_PR_UNARY(inc, ptr, void, void *, "addic %0, %0, 1", "w")
CK_PR_UNARY(dec, ptr, void, void *, "addic %0, %0, -1", "w")
CK_PR_UNARY(not, ptr, void, void *, "not %0, %0", "w")
CK_PR_UNARY(neg, ptr, void, void *, "neg %0, %0", "w")
#define CK_PR_UNARY_S(S, T, W) \
CK_PR_UNARY(inc, S, T, T, "addic %0, %0, 1", W) \
CK_PR_UNARY(dec, S, T, T, "addic %0, %0, -1", W) \
CK_PR_UNARY(not, S, T, T, "not %0, %0", W) \
CK_PR_UNARY(neg, S, T, T, "neg %0, %0", W)
CK_PR_UNARY_S(32, uint32_t, "w")
CK_PR_UNARY_S(uint, unsigned int, "w")
CK_PR_UNARY_S(int, int, "w")
#undef CK_PR_UNARY_S
#undef CK_PR_UNARY
#define CK_PR_BINARY(O, N, M, T, I, W) \
CK_CC_INLINE static void \
ck_pr_##O##_##N(M *target, T delta) \
{ \
T previous; \
__asm__ __volatile__("1:" \
"l" W "arx %0, 0, %1;" \
I " %0, %2, %0;" \
"st" W "cx. %0, 0, %1;" \
"bne- 1b;" \
: "=&r" (previous) \
: "r" (target), \
"r" (delta) \
: "memory", "cc"); \
return; \
}
CK_PR_BINARY(and, ptr, void, uintptr_t, "and", "w")
CK_PR_BINARY(add, ptr, void, uintptr_t, "add", "w")
CK_PR_BINARY(or, ptr, void, uintptr_t, "or", "w")
CK_PR_BINARY(sub, ptr, void, uintptr_t, "sub", "w")
CK_PR_BINARY(xor, ptr, void, uintptr_t, "xor", "w")
#define CK_PR_BINARY_S(S, T, W) \
CK_PR_BINARY(and, S, T, T, "and", W) \
CK_PR_BINARY(add, S, T, T, "add", W) \
CK_PR_BINARY(or, S, T, T, "or", W) \
CK_PR_BINARY(sub, S, T, T, "subf", W) \
CK_PR_BINARY(xor, S, T, T, "xor", W)
CK_PR_BINARY_S(32, uint32_t, "w")
CK_PR_BINARY_S(uint, unsigned int, "w")
CK_PR_BINARY_S(int, int, "w")
#undef CK_PR_BINARY_S
#undef CK_PR_BINARY
CK_CC_INLINE static void *
ck_pr_faa_ptr(void *target, uintptr_t delta)
{
uintptr_t previous, r;
__asm__ __volatile__("1:"
"lwarx %0, 0, %2;"
"add %1, %3, %0;"
"stwcx. %1, 0, %2;"
"bne- 1b;"
: "=&r" (previous),
"=&r" (r)
: "r" (target),
"r" (delta)
: "memory", "cc");
return (void *)(previous);
}
#define CK_PR_FAA(S, T, W) \
CK_CC_INLINE static T \
ck_pr_faa_##S(T *target, T delta) \
{ \
T previous, r; \
__asm__ __volatile__("1:" \
"l" W "arx %0, 0, %2;" \
"add %1, %3, %0;" \
"st" W "cx. %1, 0, %2;" \
"bne- 1b;" \
: "=&r" (previous), \
"=&r" (r) \
: "r" (target), \
"r" (delta) \
: "memory", "cc"); \
return (previous); \
}
CK_PR_FAA(32, uint32_t, "w")
CK_PR_FAA(uint, unsigned int, "w")
CK_PR_FAA(int, int, "w")
#undef CK_PR_FAA
#endif /* CK_PR_PPC_H */
