cpufunc.h revision 92875
1/*- 2 * Copyright (c) 1998 Doug Rabson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: head/sys/powerpc/include/cpufunc.h 92875 2002-03-21 12:04:58Z benno $ 27 */ 28 29#ifndef _MACHINE_CPUFUNC_H_ 30#define _MACHINE_CPUFUNC_H_ 31 32#ifdef _KERNEL 33 34#include <sys/types.h> 35 36#include <machine/psl.h> 37 38#define CRITICAL_FORK (mfmsr() | PSL_EE | PSL_RI) 39 40#ifdef __GNUC__ 41 42static __inline void 43breakpoint(void) 44{ 45 46 return; 47} 48 49#endif 50 51/* CPU register mangling inlines */ 52 53static __inline void 54mtmsr(unsigned int value) 55{ 56 57 __asm __volatile ("mtmsr %0" :: "r"(value)); 58} 59 60static __inline unsigned int 61mfmsr(void) 62{ 63 unsigned int value; 64 65 __asm __volatile ("mfmsr %0" : "=r"(value)); 66 67 return (value); 68} 69 70static __inline void 71mtdec(unsigned int value) 72{ 73 74 __asm __volatile ("mtdec %0" :: "r"(value)); 75} 76 77static __inline unsigned int 78mfdec(void) 79{ 80 unsigned int value; 81 82 __asm __volatile ("mfdec %0" : "=r"(value)); 83 84 return (value); 85} 86 87static __inline register_t 88intr_disable(void) 89{ 90 register_t msr; 91 92 msr = mfmsr(); 93 mtmsr(msr & ~(PSL_EE|PSL_RI)); 94 return (msr); 95} 96 97static __inline void 98intr_restore(register_t msr) 99{ 100 101 mtmsr(msr); 102} 103 104static __inline critical_t 105cpu_critical_enter(void) 106{ 107 u_int msr; 108 critical_t crit; 109 110 msr = mfmsr(); 111 crit = (critical_t)msr; 112 msr &= ~(PSL_EE | PSL_RI); 113 mtmsr(msr); 114 115 return (crit); 116} 117 118static __inline void 119restore_intr(unsigned int msr) 120{ 121 122 mtmsr(msr); 123} 124 125static __inline void 126cpu_critical_exit(critical_t msr) 127{ 128 129 mtmsr(msr); 130} 131 132static __inline void 133powerpc_mb(void) 134{ 135 136 __asm __volatile("eieio; sync" : : : "memory"); 137} 138 139static __inline struct pcpu * 140powerpc_get_pcpup(void) 141{ 142 struct pcpu *ret; 143 144 __asm ("mfsprg %0, 0" : "=r"(ret)); 145 146 return(ret); 147} 148 149#endif /* _KERNEL */ 150 151#endif /* !_MACHINE_CPUFUNC_H_ */ 152