1 /* $NetBSD: acpi_func.h,v 1.4 2010/07/24 21:53:54 jruoho Exp $ */ 2 3 /*- 4 * Copyright (c) 2000 Michael Smith 5 * Copyright (c) 2000 BSDi 6 * Copyright (c) 2007-2009 Jung-uk Kim <jkim@FreeBSD.org> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #ifndef _SYS_DEV_ACPI_ACPICA_ACPI_FUNC_H 32 #define _SYS_DEV_ACPI_ACPICA_ACPI_FUNC_H 33 34 #include <machine/cpufunc.h> 35 36 #include <sys/atomic.h> 37 38 #define GL_ACQUIRED (-1) 39 #define GL_BUSY 0 40 #define GL_BIT_PENDING 1 41 #define GL_BIT_OWNED 2 42 #define GL_BIT_MASK (GL_BIT_PENDING | GL_BIT_OWNED) 43 44 #define ACPI_ACQUIRE_GLOBAL_LOCK(GLptr, Acq) \ 45 do { \ 46 (Acq) = acpi_acquire_global_lock(&((GLptr)->GlobalLock)); \ 47 } while (0) 48 49 #define ACPI_RELEASE_GLOBAL_LOCK(GLptr, Acq) \ 50 do { \ 51 (Acq) = acpi_release_global_lock(&((GLptr)->GlobalLock)); \ 52 } while (0) 53 54 static inline int 55 acpi_acquire_global_lock(uint32_t *lock) 56 { 57 uint32_t new, old, val; 58 59 do { 60 old = *lock; 61 new = ((old & ~GL_BIT_MASK) | GL_BIT_OWNED) | 62 ((old >> 1) & GL_BIT_PENDING); 63 val = atomic_cas_32(lock, old, new); 64 } while (__predict_false(val != old)); 65 66 return ((new < GL_BIT_MASK) ? GL_ACQUIRED : GL_BUSY); 67 } 68 69 static inline int 70 acpi_release_global_lock(uint32_t *lock) 71 { 72 uint32_t new, old, val; 73 74 do { 75 old = *lock; 76 new = old & ~GL_BIT_MASK; 77 val = atomic_cas_32(lock, old, new); 78 } while (__predict_false(val != old)); 79 80 return old & GL_BIT_PENDING; 81 } 82 83 /* 84 * XXX: Should be in a MD header. 85 */ 86 #ifndef __ia64__ 87 #define ACPI_FLUSH_CPU_CACHE() wbinvd() 88 #else 89 #define ACPI_FLUSH_CPU_CACHE() /* XXX: ia64_fc()? */ 90 #endif 91 92 #endif /* !_SYS_DEV_ACPI_ACPICA_ACPI_FUNC_H */ 93