X-Git-Url: https://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=urcu%2Fuatomic%2Fppc.h;fp=urcu%2Fuatomic%2Fppc.h;h=0000000000000000000000000000000000000000;hp=0e672f57260529679b7c15d31304f57767328bb9;hb=6893800a4d1cc14dff0395ddcd660a5138db183d;hpb=a59f39055b5ecb77b68cf78b9839aa9e8e4ec332 diff --git a/urcu/uatomic/ppc.h b/urcu/uatomic/ppc.h deleted file mode 100644 index 0e672f5..0000000 --- a/urcu/uatomic/ppc.h +++ /dev/null @@ -1,237 +0,0 @@ -#ifndef _URCU_ARCH_UATOMIC_PPC_H -#define _URCU_ARCH_UATOMIC_PPC_H - -/* - * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved. - * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved. - * Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P. - * Copyright (c) 2009 Mathieu Desnoyers - * - * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED - * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. - * - * Permission is hereby granted to use or copy this program - * for any purpose, provided the above notices are retained on all copies. - * Permission to modify the code and to distribute modified code is granted, - * provided the above notices are retained, and a notice that the code was - * modified is included with the above copyright notice. - * - * Code inspired from libuatomic_ops-1.2, inherited in part from the - * Boehm-Demers-Weiser conservative garbage collector. - */ - -#include -#include - -#ifdef __cplusplus -extern "C" { -#endif - -#define ILLEGAL_INSTR ".long 0xd00d00" - -/* - * Providing sequential consistency semantic with respect to other - * instructions for cmpxchg and add_return family of atomic primitives. - * - * This is achieved with: - * lwsync (prior loads can be reordered after following load) - * lwarx - * stwcx. - * test if success (retry) - * sync - * - * Explanation of the sequential consistency provided by this scheme - * from Paul E. McKenney: - * - * The reason we can get away with the lwsync before is that if a prior - * store reorders with the lwarx, then you have to store to the atomic - * variable from some other CPU to detect it. - * - * And if you do that, the lwarx will lose its reservation, so the stwcx - * will fail. The atomic operation will retry, so that the caller won't be - * able to see the misordering. - */ - -/* xchg */ - -static inline __attribute__((always_inline)) -unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) -{ - switch (len) { - case 4: - { - unsigned int result; - - __asm__ __volatile__( - LWSYNC_OPCODE - "1:\t" "lwarx %0,0,%1\n" /* load and reserve */ - "stwcx. %2,0,%1\n" /* else store conditional */ - "bne- 1b\n" /* retry if lost reservation */ - "sync\n" - : "=&r"(result) - : "r"(addr), "r"(val) - : "memory", "cc"); - - return result; - } -#if (CAA_BITS_PER_LONG == 64) - case 8: - { - unsigned long result; - - __asm__ __volatile__( - LWSYNC_OPCODE - "1:\t" "ldarx %0,0,%1\n" /* load and reserve */ - "stdcx. %2,0,%1\n" /* else store conditional */ - "bne- 1b\n" /* retry if lost reservation */ - "sync\n" - : "=&r"(result) - : "r"(addr), "r"(val) - : "memory", "cc"); - - return result; - } -#endif - } - /* - * generate an illegal instruction. Cannot catch this with - * linker tricks when optimizations are disabled. - */ - __asm__ __volatile__(ILLEGAL_INSTR); - return 0; -} - -#define uatomic_xchg(addr, v) \ - ((__typeof__(*(addr))) _uatomic_exchange((addr), \ - caa_cast_long_keep_sign(v), \ - sizeof(*(addr)))) -/* cmpxchg */ - -static inline __attribute__((always_inline)) -unsigned long _uatomic_cmpxchg(void *addr, unsigned long old, - unsigned long _new, int len) -{ - switch (len) { - case 4: - { - unsigned int old_val; - - __asm__ __volatile__( - LWSYNC_OPCODE - "1:\t" "lwarx %0,0,%1\n" /* load and reserve */ - "cmpw %0,%3\n" /* if load is not equal to */ - "bne 2f\n" /* old, fail */ - "stwcx. %2,0,%1\n" /* else store conditional */ - "bne- 1b\n" /* retry if lost reservation */ - "sync\n" - "2:\n" - : "=&r"(old_val) - : "r"(addr), "r"((unsigned int)_new), - "r"((unsigned int)old) - : "memory", "cc"); - - return old_val; - } -#if (CAA_BITS_PER_LONG == 64) - case 8: - { - unsigned long old_val; - - __asm__ __volatile__( - LWSYNC_OPCODE - "1:\t" "ldarx %0,0,%1\n" /* load and reserve */ - "cmpd %0,%3\n" /* if load is not equal to */ - "bne 2f\n" /* old, fail */ - "stdcx. %2,0,%1\n" /* else store conditional */ - "bne- 1b\n" /* retry if lost reservation */ - "sync\n" - "2:\n" - : "=&r"(old_val) - : "r"(addr), "r"((unsigned long)_new), - "r"((unsigned long)old) - : "memory", "cc"); - - return old_val; - } -#endif - } - /* - * generate an illegal instruction. Cannot catch this with - * linker tricks when optimizations are disabled. - */ - __asm__ __volatile__(ILLEGAL_INSTR); - return 0; -} - - -#define uatomic_cmpxchg(addr, old, _new) \ - ((__typeof__(*(addr))) _uatomic_cmpxchg((addr), \ - caa_cast_long_keep_sign(old), \ - caa_cast_long_keep_sign(_new),\ - sizeof(*(addr)))) - -/* uatomic_add_return */ - -static inline __attribute__((always_inline)) -unsigned long _uatomic_add_return(void *addr, unsigned long val, - int len) -{ - switch (len) { - case 4: - { - unsigned int result; - - __asm__ __volatile__( - LWSYNC_OPCODE - "1:\t" "lwarx %0,0,%1\n" /* load and reserve */ - "add %0,%2,%0\n" /* add val to value loaded */ - "stwcx. %0,0,%1\n" /* store conditional */ - "bne- 1b\n" /* retry if lost reservation */ - "sync\n" - : "=&r"(result) - : "r"(addr), "r"(val) - : "memory", "cc"); - - return result; - } -#if (CAA_BITS_PER_LONG == 64) - case 8: - { - unsigned long result; - - __asm__ __volatile__( - LWSYNC_OPCODE - "1:\t" "ldarx %0,0,%1\n" /* load and reserve */ - "add %0,%2,%0\n" /* add val to value loaded */ - "stdcx. %0,0,%1\n" /* store conditional */ - "bne- 1b\n" /* retry if lost reservation */ - "sync\n" - : "=&r"(result) - : "r"(addr), "r"(val) - : "memory", "cc"); - - return result; - } -#endif - } - /* - * generate an illegal instruction. Cannot catch this with - * linker tricks when optimizations are disabled. - */ - __asm__ __volatile__(ILLEGAL_INSTR); - return 0; -} - - -#define uatomic_add_return(addr, v) \ - ((__typeof__(*(addr))) _uatomic_add_return((addr), \ - caa_cast_long_keep_sign(v), \ - sizeof(*(addr)))) - -#ifdef __cplusplus -} -#endif - -#include - -#endif /* _URCU_ARCH_UATOMIC_PPC_H */