StdLib/Include/Ipf/machine/acpi_func.h

   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_ */