173 lines
4.5 KiB
C
173 lines
4.5 KiB
C
/* xchg and cmpxchg operation emulation for FR-V
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*
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* For an explanation of how atomic ops work in this arch, see:
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* Documentation/frv/atomic-ops.txt
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*
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* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _ASM_CMPXCHG_H
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#define _ASM_CMPXCHG_H
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#include <linux/types.h>
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/*****************************************************************************/
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/*
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* exchange value with memory
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*/
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extern uint64_t __xchg_64(uint64_t i, volatile void *v);
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#ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
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#define xchg(ptr, x) \
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({ \
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__typeof__(ptr) __xg_ptr = (ptr); \
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__typeof__(*(ptr)) __xg_orig; \
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\
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switch (sizeof(__xg_orig)) { \
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case 4: \
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asm volatile( \
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"swap%I0 %M0,%1" \
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: "+m"(*__xg_ptr), "=r"(__xg_orig) \
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: "1"(x) \
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: "memory" \
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); \
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break; \
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\
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default: \
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__xg_orig = (__typeof__(__xg_orig))0; \
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asm volatile("break"); \
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break; \
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} \
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\
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__xg_orig; \
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})
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#else
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extern uint32_t __xchg_32(uint32_t i, volatile void *v);
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#define xchg(ptr, x) \
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({ \
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__typeof__(ptr) __xg_ptr = (ptr); \
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__typeof__(*(ptr)) __xg_orig; \
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\
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switch (sizeof(__xg_orig)) { \
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case 4: __xg_orig = (__typeof__(*(ptr))) __xchg_32((uint32_t) x, __xg_ptr); break; \
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default: \
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__xg_orig = (__typeof__(__xg_orig))0; \
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asm volatile("break"); \
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break; \
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} \
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__xg_orig; \
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})
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#endif
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#define tas(ptr) (xchg((ptr), 1))
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/*****************************************************************************/
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/*
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* compare and conditionally exchange value with memory
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* - if (*ptr == test) then orig = *ptr; *ptr = test;
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* - if (*ptr != test) then orig = *ptr;
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*/
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extern uint64_t __cmpxchg_64(uint64_t test, uint64_t new, volatile uint64_t *v);
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#ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
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#define cmpxchg(ptr, test, new) \
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({ \
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__typeof__(ptr) __xg_ptr = (ptr); \
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__typeof__(*(ptr)) __xg_orig, __xg_tmp; \
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__typeof__(*(ptr)) __xg_test = (test); \
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__typeof__(*(ptr)) __xg_new = (new); \
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\
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switch (sizeof(__xg_orig)) { \
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case 4: \
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asm volatile( \
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"0: \n" \
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" orcc gr0,gr0,gr0,icc3 \n" \
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" ckeq icc3,cc7 \n" \
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" ld.p %M0,%1 \n" \
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" orcr cc7,cc7,cc3 \n" \
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" sub%I4cc %1,%4,%2,icc0 \n" \
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" bne icc0,#0,1f \n" \
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" cst.p %3,%M0 ,cc3,#1 \n" \
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" corcc gr29,gr29,gr0 ,cc3,#1 \n" \
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" beq icc3,#0,0b \n" \
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"1: \n" \
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: "+U"(*__xg_ptr), "=&r"(__xg_orig), "=&r"(__xg_tmp) \
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: "r"(__xg_new), "NPr"(__xg_test) \
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: "memory", "cc7", "cc3", "icc3", "icc0" \
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); \
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break; \
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\
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default: \
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__xg_orig = (__typeof__(__xg_orig))0; \
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asm volatile("break"); \
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break; \
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} \
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\
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__xg_orig; \
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})
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#else
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extern uint32_t __cmpxchg_32(uint32_t *v, uint32_t test, uint32_t new);
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#define cmpxchg(ptr, test, new) \
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({ \
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__typeof__(ptr) __xg_ptr = (ptr); \
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__typeof__(*(ptr)) __xg_orig; \
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__typeof__(*(ptr)) __xg_test = (test); \
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__typeof__(*(ptr)) __xg_new = (new); \
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\
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switch (sizeof(__xg_orig)) { \
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case 4: __xg_orig = (__force __typeof__(*ptr)) \
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__cmpxchg_32((__force uint32_t *)__xg_ptr, \
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(__force uint32_t)__xg_test, \
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(__force uint32_t)__xg_new); break; \
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default: \
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__xg_orig = (__typeof__(__xg_orig))0; \
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asm volatile("break"); \
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break; \
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} \
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\
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__xg_orig; \
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})
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#endif
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#include <asm-generic/cmpxchg-local.h>
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static inline unsigned long __cmpxchg_local(volatile void *ptr,
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unsigned long old,
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unsigned long new, int size)
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{
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switch (size) {
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case 4:
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return cmpxchg((unsigned long *)ptr, old, new);
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default:
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return __cmpxchg_local_generic(ptr, old, new, size);
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}
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return old;
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}
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/*
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* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
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* them available.
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*/
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#define cmpxchg_local(ptr, o, n) \
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((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \
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(unsigned long)(n), sizeof(*(ptr))))
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#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
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#endif /* _ASM_CMPXCHG_H */
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