| 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 | |