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1.1 ! nbrk 1: /* $OpenBSD: atomic.h,v 1.6 2007/03/17 09:12:03 martin Exp $ */
! 2: /* $NetBSD: atomic.h,v 1.7 2001/12/17 23:34:57 thorpej Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
! 6: * All rights reserved.
! 7: *
! 8: * This code is derived from software contributed to The NetBSD Foundation
! 9: * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
! 10: * NASA Ames Research Center.
! 11: *
! 12: * Redistribution and use in source and binary forms, with or without
! 13: * modification, are permitted provided that the following conditions
! 14: * are met:
! 15: * 1. Redistributions of source code must retain the above copyright
! 16: * notice, this list of conditions and the following disclaimer.
! 17: * 2. Redistributions in binary form must reproduce the above copyright
! 18: * notice, this list of conditions and the following disclaimer in the
! 19: * documentation and/or other materials provided with the distribution.
! 20: * 3. All advertising materials mentioning features or use of this software
! 21: * must display the following acknowledgement:
! 22: * This product includes software developed by the NetBSD
! 23: * Foundation, Inc. and its contributors.
! 24: * 4. Neither the name of The NetBSD Foundation nor the names of its
! 25: * contributors may be used to endorse or promote products derived
! 26: * from this software without specific prior written permission.
! 27: *
! 28: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
! 29: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 30: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 31: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
! 32: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 33: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 34: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 35: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 36: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 37: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 38: * POSSIBILITY OF SUCH DAMAGE.
! 39: */
! 40:
! 41: /*
! 42: * Misc. `atomic' operations.
! 43: */
! 44:
! 45: #ifndef _ALPHA_ATOMIC_H_
! 46: #define _ALPHA_ATOMIC_H_
! 47:
! 48: #if defined(_KERNEL)
! 49:
! 50: /*
! 51: * atomic_setbits_ulong:
! 52: *
! 53: * Atomically set bits in a `unsigned long'.
! 54: */
! 55: static __inline void
! 56: atomic_setbits_ulong(__volatile unsigned long *ulp, unsigned long v)
! 57: {
! 58: unsigned long t0;
! 59:
! 60: __asm __volatile(
! 61: "# BEGIN atomic_setbits_ulong\n"
! 62: "1: ldq_l %0, %3 \n"
! 63: " or %0, %2, %0 \n"
! 64: " stq_c %0, %1 \n"
! 65: " beq %0, 2f \n"
! 66: " mb \n"
! 67: " br 3f \n"
! 68: "2: br 1b \n"
! 69: "3: \n"
! 70: " # END atomic_setbits_ulong"
! 71: : "=&r" (t0), "=m" (*ulp)
! 72: : "r" (v), "m" (*ulp)
! 73: : "memory");
! 74: }
! 75:
! 76: /*
! 77: * atomic_clearbits_ulong:
! 78: *
! 79: * Atomically clear bits in a `unsigned long'.
! 80: */
! 81: static __inline void
! 82: atomic_clearbits_ulong(__volatile unsigned long *ulp, unsigned long v)
! 83: {
! 84: unsigned long t0;
! 85:
! 86: __asm __volatile(
! 87: "# BEGIN atomic_clearbits_ulong\n"
! 88: "1: ldq_l %0, %3 \n"
! 89: " and %0, %2, %0 \n"
! 90: " stq_c %0, %1 \n"
! 91: " beq %0, 2f \n"
! 92: " mb \n"
! 93: " br 3f \n"
! 94: "2: br 1b \n"
! 95: "3: \n"
! 96: " # END atomic_clearbits_ulong"
! 97: : "=&r" (t0), "=m" (*ulp)
! 98: : "r" (~v), "m" (*ulp)
! 99: : "memory");
! 100: }
! 101:
! 102: /*
! 103: * atomic_add_ulong:
! 104: *
! 105: * Atomically add a value to a `unsigned long'.
! 106: */
! 107: static __inline void
! 108: atomic_add_ulong(__volatile unsigned long *ulp, unsigned long v)
! 109: {
! 110: unsigned long t0;
! 111:
! 112: __asm __volatile(
! 113: "# BEGIN atomic_add_ulong\n"
! 114: "1: ldq_l %0, %3 \n"
! 115: " addq %0, %2, %0 \n"
! 116: " stq_c %0, %1 \n"
! 117: " beq %0, 2f \n"
! 118: " mb \n"
! 119: " br 3f \n"
! 120: "2: br 1b \n"
! 121: "3: \n"
! 122: " # END atomic_add_ulong"
! 123: : "=&r" (t0), "=m" (*ulp)
! 124: : "r" (v), "m" (*ulp)
! 125: : "memory");
! 126: }
! 127:
! 128: /*
! 129: * atomic_sub_ulong:
! 130: *
! 131: * Atomically subtract a value from a `unsigned long'.
! 132: */
! 133: static __inline void
! 134: atomic_sub_ulong(__volatile unsigned long *ulp, unsigned long v)
! 135: {
! 136: unsigned long t0;
! 137:
! 138: __asm __volatile(
! 139: "# BEGIN atomic_sub_ulong\n"
! 140: "1: ldq_l %0, %3 \n"
! 141: " subq %0, %2, %0 \n"
! 142: " stq_c %0, %1 \n"
! 143: " beq %0, 2f \n"
! 144: " mb \n"
! 145: " br 3f \n"
! 146: "2: br 1b \n"
! 147: "3: \n"
! 148: " # END atomic_sub_ulong"
! 149: : "=&r" (t0), "=m" (*ulp)
! 150: : "r" (v), "m" (*ulp)
! 151: : "memory");
! 152: }
! 153:
! 154: /*
! 155: * atomic_loadlatch_ulong:
! 156: *
! 157: * Atomically load and latch a `unsigned long' value.
! 158: */
! 159: static __inline unsigned long
! 160: atomic_loadlatch_ulong(__volatile unsigned long *ulp, unsigned long v)
! 161: {
! 162: unsigned long t0, v0;
! 163:
! 164: __asm __volatile(
! 165: "# BEGIN atomic_loadlatch_ulong\n"
! 166: "1: mov %3, %0 \n"
! 167: " ldq_l %1, %4 \n"
! 168: " stq_c %0, %2 \n"
! 169: " beq %0, 2f \n"
! 170: " mb \n"
! 171: " br 3f \n"
! 172: "2: br 1b \n"
! 173: "3: \n"
! 174: " # END atomic_loadlatch_ulong"
! 175: : "=&r" (t0), "=r" (v0), "=m" (*ulp)
! 176: : "r" (v), "m" (*ulp)
! 177: : "memory");
! 178:
! 179: return (v0);
! 180: }
! 181:
! 182: /*
! 183: * atomic_setbits_int:
! 184: *
! 185: * Atomically set bits in a `unsigned int'.
! 186: */
! 187: static __inline void
! 188: atomic_setbits_int(__volatile unsigned int *uip, unsigned int v)
! 189: {
! 190: unsigned int t0;
! 191:
! 192: __asm __volatile(
! 193: "# BEGIN atomic_setbits_ulong\n"
! 194: "1: ldl_l %0, %3 \n"
! 195: " or %0, %2, %0 \n"
! 196: " stl_c %0, %1 \n"
! 197: " beq %0, 2f \n"
! 198: " mb \n"
! 199: " br 3f \n"
! 200: "2: br 1b \n"
! 201: "3: \n"
! 202: " # END atomic_setbits_int"
! 203: : "=&r" (t0), "=m" (*uip)
! 204: : "r" (v), "m" (*uip)
! 205: : "memory");
! 206: }
! 207:
! 208: /*
! 209: * atomic_clearbits_int:
! 210: *
! 211: * Atomically clear bits in a `unsigned int'.
! 212: */
! 213: static __inline void
! 214: atomic_clearbits_int(__volatile unsigned int *uip, unsigned int v)
! 215: {
! 216: unsigned int t0;
! 217:
! 218: __asm __volatile(
! 219: "# BEGIN atomic_clearbits_int\n"
! 220: "1: ldl_l %0, %3 \n"
! 221: " and %0, %2, %0 \n"
! 222: " stl_c %0, %1 \n"
! 223: " beq %0, 2f \n"
! 224: " mb \n"
! 225: " br 3f \n"
! 226: "2: br 1b \n"
! 227: "3: \n"
! 228: " # END atomic_clearbits_int"
! 229: : "=&r" (t0), "=m" (*uip)
! 230: : "r" (~v), "m" (*uip)
! 231: : "memory");
! 232: }
! 233:
! 234: #endif /* defined(_KERNEL) */
! 235: #endif /* _ALPHA_ATOMIC_H_ */