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  */
  74 acpi_status ACPI_INIT_FUNCTION acpi_os_initialize(void);
  75
  76 acpi_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  */
  84 static inline void *acpi_os_allocate(acpi_size size)
  85 {
  86         return kmalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
  87 }
  88
  89 static inline void *acpi_os_allocate_zeroed(acpi_size size)
  90 {
  91         return kzalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
  92 }
  93
  94 static inline void acpi_os_free(void *memory)
  95 {
  96         kfree(memory);
  97 }
  98
  99 static 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
 105 static 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
 127 static inline u8 acpi_os_readable(void *pointer, acpi_size length)
 128 {
 129         return TRUE;
 130 }
 131
 132 static inline acpi_status acpi_os_initialize_debugger(void)
 133 {
 134         return AE_OK;
 135 }
 136
 137 static 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__ */