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 * $FreeBSD$ 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) 39 40 #ifdef __GNUC__ 41 42 static __inline void 43 breakpoint(void) 44 { 45 46 return; 47 } 48 49 #endif 50 51 /* CPU register mangling inlines */ 52 53 static __inline void 54 mtmsr(unsigned int value) 55 { 56 57 __asm __volatile ("mtmsr %0" :: "r"(value)); 58 } 59 60 static __inline unsigned int 61 mfmsr(void) 62 { 63 unsigned int value; 64 65 __asm __volatile ("mfmsr %0" : "=r"(value)); 66 67 return (value); 68 } 69 70 static __inline void 71 mtdec(unsigned int value) 72 { 73 74 __asm __volatile ("mtdec %0" :: "r"(value)); 75 } 76 77 static __inline unsigned int 78 mfdec(void) 79 { 80 unsigned int value; 81 82 __asm __volatile ("mfdec %0" : "=r"(value)); 83 84 return (value); 85 } 86 87 /* 88 * Bogus interrupt manipulation 89 */ 90 static __inline void 91 disable_intr(void) 92 { 93 unsigned int msr; 94 95 msr = mfmsr(); 96 mtmsr(msr & ~PSL_EE); 97 } 98 99 static __inline void 100 enable_intr(void) 101 { 102 unsigned int msr; 103 104 msr = mfmsr(); 105 mtmsr(msr | PSL_EE); 106 } 107 108 static __inline unsigned int 109 save_intr(void) 110 { 111 unsigned int msr; 112 113 msr = mfmsr(); 114 115 return msr; 116 } 117 118 static __inline critical_t 119 cpu_critical_enter(void) 120 { 121 122 return ((critical_t)save_intr()); 123 } 124 125 static __inline void 126 restore_intr(unsigned int msr) 127 { 128 129 mtmsr(msr); 130 } 131 132 static __inline void 133 cpu_critical_exit(critical_t msr) 134 { 135 136 return (restore_intr((unsigned int)msr)); 137 } 138 139 static __inline void 140 powerpc_mb(void) 141 { 142 143 __asm __volatile("eieio; sync" : : : "memory"); 144 } 145 146 static __inline struct pcpu * 147 powerpc_get_pcpup(void) 148 { 149 struct pcpu *ret; 150 151 __asm ("mfsprg %0, 0" : "=r"(ret)); 152 153 return(ret); 154 } 155 156 #endif /* _KERNEL */ 157 158 #endif /* !_MACHINE_CPUFUNC_H_ */ 159