1 /* $NetBSD: acpi_func.h,v 1.2 2006/05/14 21:55:38 elad Exp $ */ 2 3 /*- 4 * Copyright (c) 2002 Mitsuru IWASAKI 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: src/sys/ia64/include/acpica_machdep.h,v 1.4 2004/10/11 05:39:15 njl Exp $ 29 */ 30 31 /****************************************************************************** 32 * 33 * Name: acpica_machdep.h - arch-specific defines, etc. 34 * $Revision: 1.2 $ 35 * 36 *****************************************************************************/ 37 38 #ifndef _IA64_ACPI_FUNC_H_ 39 #define _IA64_ACPI_FUNC_H_ 40 41 #include <machine/cpufunc.h> 42 #include <machine/atomic.h> 43 44 /* Asm macros */ 45 46 #define ACPI_ASM_MACROS 47 #define BREAKPOINT3 48 #define ACPI_DISABLE_IRQS() disable_intr() 49 #define ACPI_ENABLE_IRQS() enable_intr() 50 51 #define ACPI_FLUSH_CPU_CACHE() /* XXX ia64_fc()? */ 52 53 54 /* Section 5.2.9.1: global lock acquire/release functions */ 55 extern int acpi_acquire_global_lock(uint32_t *lock); 56 extern int acpi_release_global_lock(uint32_t *lock); 57 #define ACPI_ACQUIRE_GLOBAL_LOCK(GLptr, Acq) \ 58 ((Acq) = acpi_acquire_global_lock(GLptr)) 59 #define ACPI_RELEASE_GLOBAL_LOCK(GLptr, Acq) \ 60 ((Acq) = acpi_release_global_lock(GLptr)) 61 62 63 /* Section 5.2.9.1: global lock acquire/release functions */ 64 #define GL_ACQUIRED (-1) 65 #define GL_BUSY 0 66 #define GL_BIT_PENDING 0x1 67 #define GL_BIT_OWNED 0x2 68 #define GL_BIT_MASK (GL_BIT_PENDING | GL_BIT_OWNED) 69 70 /* 71 * Acquire the global lock. If busy, set the pending bit. The caller 72 * will wait for notification from the BIOS that the lock is available 73 * and then attempt to acquire it again. 74 */ 75 int 76 acpi_acquire_global_lock(uint32_t *lock) 77 { 78 uint32_t new, old; 79 80 do { 81 old = *lock; 82 new = ((old & ~GL_BIT_MASK) | GL_BIT_OWNED) | 83 ((old >> 1) & GL_BIT_PENDING); 84 } while (atomic_cmpset_acq_int(lock, old, new) == 0); 85 86 return ((new < GL_BIT_MASK) ? GL_ACQUIRED : GL_BUSY); 87 } 88 89 /* 90 * Release the global lock, returning whether there is a waiter pending. 91 * If the BIOS set the pending bit, OSPM must notify the BIOS when it 92 * releases the lock. 93 */ 94 int 95 acpi_release_global_lock(uint32_t *lock) 96 { 97 uint32_t new, old; 98 99 do { 100 old = *lock; 101 new = old & ~GL_BIT_MASK; 102 } while (atomic_cmpset_rel_int(lock, old, new) == 0); 103 104 return (old & GL_BIT_PENDING); 105 } 106 107 #endif /* _IA64_ACPI_FUNC_H_ */ 108
