LXR linux/include/acpi/platform/aclinuxex.h

   1/******************************************************************************
   2 *
   3 * Name: aclinuxex.h - Extra OS specific defines, etc. for Linux
   4 *
   5 *****************************************************************************/
   6
   7/*
   8 * Copyright (C) 2000 - 2018, Intel Corp.
   9 * All rights reserved.
  10 *
  11 * Redistribution and use in source and binary forms, with or without
  12 * modification, are permitted provided that the following conditions
  13 * are met:
  14 * 1. Redistributions of source code must retain the above copyright
  15 *    notice, this list of conditions, and the following disclaimer,
  16 *    without modification.
  17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18 *    substantially similar to the "NO WARRANTY" disclaimer below
  19 *    ("Disclaimer") and any redistribution must be conditioned upon
  20 *    including a substantially similar Disclaimer requirement for further
  21 *    binary redistribution.
  22 * 3. Neither the names of the above-listed copyright holders nor the names
  23 *    of any contributors may be used to endorse or promote products derived
  24 *    from this software without specific prior written permission.
  25 *
  26 * Alternatively, this software may be distributed under the terms of the
  27 * GNU General Public License ("GPL") version 2 as published by the Free
  28 * Software Foundation.
  29 *
  30 * NO WARRANTY
  31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41 * POSSIBILITY OF SUCH DAMAGES.
  42 */
  43
  44#ifndef __ACLINUXEX_H__
  45#define __ACLINUXEX_H__
  46
  47#ifdef __KERNEL__
  48
  49#ifndef ACPI_USE_NATIVE_DIVIDE
  50
  51#ifndef ACPI_DIV_64_BY_32
  52#define ACPI_DIV_64_BY_32(n_hi, n_lo, d32, q32, r32) \
  53        do { \
  54                u64 (__n) = ((u64) n_hi) << 32 | (n_lo); \
  55                (r32) = do_div ((__n), (d32)); \
  56                (q32) = (u32) (__n); \
  57        } while (0)
  58#endif
  59
  60#ifndef ACPI_SHIFT_RIGHT_64
  61#define ACPI_SHIFT_RIGHT_64(n_hi, n_lo) \
  62        do { \
  63                (n_lo) >>= 1; \
  64                (n_lo) |= (((n_hi) & 1) << 31); \
  65                (n_hi) >>= 1; \
  66        } while (0)
  67#endif
  68
  69#endif
  70
  71/*
  72 * Overrides for in-kernel ACPICA
  73 */
  74acpi_status ACPI_INIT_FUNCTION acpi_os_initialize(void);
  75
  76acpi_status acpi_os_terminate(void);
  77
  78/*
  79 * The irqs_disabled() check is for resume from RAM.
  80 * Interrupts are off during resume, just like they are for boot.
  81 * However, boot has  (system_state != SYSTEM_RUNNING)
  82 * to quiet __might_sleep() in kmalloc() and resume does not.
  83 */
  84static inline void *acpi_os_allocate(acpi_size size)
  85{
  86        return kmalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
  87}
  88
  89static inline void *acpi_os_allocate_zeroed(acpi_size size)
  90{
  91        return kzalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
  92}
  93
  94static inline void acpi_os_free(void *memory)
  95{
  96        kfree(memory);
  97}
  98
  99static inline void *acpi_os_acquire_object(acpi_cache_t * cache)
 100{
 101        return kmem_cache_zalloc(cache,
 102                                 irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
 103}
 104
 105static inline acpi_thread_id acpi_os_get_thread_id(void)
 106{
 107        return (acpi_thread_id) (unsigned long)current;
 108}
 109
 110/*
 111 * When lockdep is enabled, the spin_lock_init() macro stringifies it's
 112 * argument and uses that as a name for the lock in debugging.
 113 * By executing spin_lock_init() in a macro the key changes from "lock" for
 114 * all locks to the name of the argument of acpi_os_create_lock(), which
 115 * prevents lockdep from reporting false positives for ACPICA locks.
 116 */
 117#define acpi_os_create_lock(__handle) \
 118        ({ \
 119                spinlock_t *lock = ACPI_ALLOCATE(sizeof(*lock)); \
 120                if (lock) { \
 121                        *(__handle) = lock; \
 122                        spin_lock_init(*(__handle)); \
 123                } \
 124                lock ? AE_OK : AE_NO_MEMORY; \
 125        })
 126
 127static inline u8 acpi_os_readable(void *pointer, acpi_size length)
 128{
 129        return TRUE;
 130}
 131
 132static inline acpi_status acpi_os_initialize_debugger(void)
 133{
 134        return AE_OK;
 135}
 136
 137static inline void acpi_os_terminate_debugger(void)
 138{
 139        return;
 140}
 141
 142/*
 143 * OSL interfaces added by Linux
 144 */
 145
 146#endif                          /* __KERNEL__ */
 147
 148#endif                          /* __ACLINUXEX_H__ */
 149