| 1 | /* |
| 2 | * Copyright (c) 1997, by Steve Passe |
| 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. The name of the developer may NOT be used to endorse or promote products |
| 11 | * derived from this software without specific prior written permission. |
| 12 | * |
| 13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 14 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 16 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 17 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 18 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 19 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 20 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 21 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 22 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 23 | * SUCH DAMAGE. |
| 24 | * |
| 25 | * $FreeBSD: src/sys/i386/include/lock.h,v 1.11.2.2 2000/09/30 02:49:34 ps Exp $ |
| 26 | */ |
| 27 | |
| 28 | |
| 29 | #ifndef _MACHINE_LOCK_H_ |
| 30 | #define _MACHINE_LOCK_H_ |
| 31 | |
| 32 | |
| 33 | #ifdef LOCORE |
| 34 | |
| 35 | #ifdef SMP |
| 36 | |
| 37 | #define MPLOCKED lock ; |
| 38 | |
| 39 | /* |
| 40 | * Some handy macros to allow logical organization. |
| 41 | */ |
| 42 | |
| 43 | #define MP_LOCK call _get_mplock |
| 44 | |
| 45 | #define MP_TRYLOCK \ |
| 46 | pushl $_mp_lock ; /* GIANT_LOCK */ \ |
| 47 | call _MPtrylock ; /* try to get lock */ \ |
| 48 | add $4, %esp |
| 49 | |
| 50 | #define MP_RELLOCK \ |
| 51 | movl $_mp_lock,%edx ; /* GIANT_LOCK */ \ |
| 52 | call _MPrellock_edx |
| 53 | |
| 54 | /* |
| 55 | * Protects the IO APIC and apic_imen as a critical region. |
| 56 | */ |
| 57 | #define IMASK_LOCK \ |
| 58 | pushl $_imen_lock ; /* address of lock */ \ |
| 59 | call _s_lock ; /* MP-safe */ \ |
| 60 | addl $4, %esp |
| 61 | |
| 62 | #define IMASK_UNLOCK \ |
| 63 | movl $0, _imen_lock |
| 64 | |
| 65 | #else /* SMP */ |
| 66 | |
| 67 | #define MPLOCKED /* NOP */ |
| 68 | |
| 69 | #define MP_LOCK /* NOP */ |
| 70 | |
| 71 | #endif /* SMP */ |
| 72 | |
| 73 | #else /* LOCORE */ |
| 74 | |
| 75 | #ifdef SMP |
| 76 | |
| 77 | #include <machine/smptests.h> /** xxx_LOCK */ |
| 78 | |
| 79 | /* |
| 80 | * Locks regions protected in UP kernel via cli/sti. |
| 81 | */ |
| 82 | #ifdef USE_MPINTRLOCK |
| 83 | #define MPINTR_LOCK() s_lock(&mpintr_lock) |
| 84 | #define MPINTR_UNLOCK() s_unlock(&mpintr_lock) |
| 85 | #else |
| 86 | #define MPINTR_LOCK() |
| 87 | #define MPINTR_UNLOCK() |
| 88 | #endif /* USE_MPINTRLOCK */ |
| 89 | |
| 90 | /* |
| 91 | * sio/cy lock. |
| 92 | * XXX should rc (RISCom/8) use this? |
| 93 | */ |
| 94 | #ifdef USE_COMLOCK |
| 95 | #define COM_LOCK() s_lock(&com_lock) |
| 96 | #define COM_UNLOCK() s_unlock(&com_lock) |
| 97 | #define COM_DISABLE_INTR() \ |
| 98 | { __asm __volatile("cli" : : : "memory"); COM_LOCK(); } |
| 99 | #define COM_ENABLE_INTR() \ |
| 100 | { COM_UNLOCK(); __asm __volatile("sti"); } |
| 101 | #else |
| 102 | #define COM_LOCK() |
| 103 | #define COM_UNLOCK() |
| 104 | #define COM_DISABLE_INTR() disable_intr() |
| 105 | #define COM_ENABLE_INTR() enable_intr() |
| 106 | #endif /* USE_COMLOCK */ |
| 107 | |
| 108 | /* |
| 109 | * Clock hardware/struct lock. |
| 110 | * XXX pcaudio and friends still need this lock installed. |
| 111 | */ |
| 112 | #ifdef USE_CLOCKLOCK |
| 113 | #define CLOCK_LOCK() s_lock(&clock_lock) |
| 114 | #define CLOCK_UNLOCK() s_unlock(&clock_lock) |
| 115 | #define CLOCK_DISABLE_INTR() \ |
| 116 | { __asm __volatile("cli" : : : "memory"); CLOCK_LOCK(); } |
| 117 | #define CLOCK_ENABLE_INTR() \ |
| 118 | { CLOCK_UNLOCK(); __asm __volatile("sti"); } |
| 119 | #else |
| 120 | #define CLOCK_LOCK() |
| 121 | #define CLOCK_UNLOCK() |
| 122 | #define CLOCK_DISABLE_INTR() disable_intr() |
| 123 | #define CLOCK_ENABLE_INTR() enable_intr() |
| 124 | #endif /* USE_CLOCKLOCK */ |
| 125 | |
| 126 | #else /* SMP */ |
| 127 | |
| 128 | #define MPINTR_LOCK() |
| 129 | #define MPINTR_UNLOCK() |
| 130 | |
| 131 | #define COM_LOCK() |
| 132 | #define COM_UNLOCK() |
| 133 | #define CLOCK_LOCK() |
| 134 | #define CLOCK_UNLOCK() |
| 135 | |
| 136 | #endif /* SMP */ |
| 137 | |
| 138 | /* |
| 139 | * Simple spin lock. |
| 140 | * It is an error to hold one of these locks while a process is sleeping. |
| 141 | */ |
| 142 | struct simplelock { |
| 143 | volatile int lock_data; |
| 144 | }; |
| 145 | |
| 146 | /* functions in simplelock.s */ |
| 147 | void s_lock_init __P((struct simplelock *)); |
| 148 | void s_lock __P((struct simplelock *)); |
| 149 | int s_lock_try __P((struct simplelock *)); |
| 150 | void ss_lock __P((struct simplelock *)); |
| 151 | void ss_unlock __P((struct simplelock *)); |
| 152 | void s_lock_np __P((struct simplelock *)); |
| 153 | void s_unlock_np __P((struct simplelock *)); |
| 154 | |
| 155 | /* inline simplelock functions */ |
| 156 | static __inline void |
| 157 | s_unlock(struct simplelock *lkp) |
| 158 | { |
| 159 | lkp->lock_data = 0; |
| 160 | } |
| 161 | |
| 162 | /* global data in mp_machdep.c */ |
| 163 | extern struct simplelock imen_lock; |
| 164 | extern struct simplelock cpl_lock; |
| 165 | extern struct simplelock fast_intr_lock; |
| 166 | extern struct simplelock intr_lock; |
| 167 | extern struct simplelock clock_lock; |
| 168 | extern struct simplelock com_lock; |
| 169 | extern struct simplelock mpintr_lock; |
| 170 | extern struct simplelock mcount_lock; |
| 171 | |
| 172 | #if !defined(SIMPLELOCK_DEBUG) && MAXCPU > 1 |
| 173 | /* |
| 174 | * This set of defines turns on the real functions in i386/isa/apic_ipl.s. |
| 175 | */ |
| 176 | #define simple_lock_init(alp) s_lock_init(alp) |
| 177 | #define simple_lock(alp) s_lock(alp) |
| 178 | #define simple_lock_try(alp) s_lock_try(alp) |
| 179 | #define simple_unlock(alp) s_unlock(alp) |
| 180 | |
| 181 | #endif /* !SIMPLELOCK_DEBUG && MAXCPU > 1 */ |
| 182 | |
| 183 | #endif /* LOCORE */ |
| 184 | |
| 185 | #endif /* !_MACHINE_LOCK_H_ */ |