text: /******************************************************************************
   *
   * Module Name: osunixmap - Unix OSL for file mappings
   *
   *****************************************************************************/
  
  /******************************************************************************
   *
   * 1. Copyright Notice
   *
   * Some or all of this work - Copyright (c) 1999 - 2015, Intel Corp.
   * All rights reserved.
   *
   * 2. License
   *
   * 2.1. This is your license from Intel Corp. under its intellectual property
   * rights. You may have additional license terms from the party that provided
   * you this software, covering your right to use that party's intellectual
   * property rights.
   *
   * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
   * copy of the source code appearing in this file ("Covered Code") an
   * irrevocable, perpetual, worldwide license under Intel's copyrights in the
   * base code distributed originally by Intel ("Original Intel Code") to copy,
   * make derivatives, distribute, use and display any portion of the Covered
   * Code in any form, with the right to sublicense such rights; and
   *
   * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
   * license (with the right to sublicense), under only those claims of Intel
   * patents that are infringed by the Original Intel Code, to make, use, sell,
   * offer to sell, and import the Covered Code and derivative works thereof
   * solely to the minimum extent necessary to exercise the above copyright
   * license, and in no event shall the patent license extend to any additions
   * to or modifications of the Original Intel Code. No other license or right
   * is granted directly or by implication, estoppel or otherwise;
   *
   * The above copyright and patent license is granted only if the following
   * conditions are met:
   *
   * 3. Conditions
   *
   * 3.1. Redistribution of Source with Rights to Further Distribute Source.
   * Redistribution of source code of any substantial portion of the Covered
   * Code or modification with rights to further distribute source must include
   * the above Copyright Notice, the above License, this list of Conditions,
   * and the following Disclaimer and Export Compliance provision. In addition,
   * Licensee must cause all Covered Code to which Licensee contributes to
   * contain a file documenting the changes Licensee made to create that Covered
   * Code and the date of any change. Licensee must include in that file the
   * documentation of any changes made by any predecessor Licensee. Licensee
   * must include a prominent statement that the modification is derived,
   * directly or indirectly, from Original Intel Code.
   *
   * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
   * Redistribution of source code of any substantial portion of the Covered
   * Code or modification without rights to further distribute source must
   * include the following Disclaimer and Export Compliance provision in the
   * documentation and/or other materials provided with distribution. In
   * addition, Licensee may not authorize further sublicense of source of any
   * portion of the Covered Code, and must include terms to the effect that the
   * license from Licensee to its licensee is limited to the intellectual
   * property embodied in the software Licensee provides to its licensee, and
   * not to intellectual property embodied in modifications its licensee may
   * make.
   *
   * 3.3. Redistribution of Executable. Redistribution in executable form of any
   * substantial portion of the Covered Code or modification must reproduce the
   * above Copyright Notice, and the following Disclaimer and Export Compliance
   * provision in the documentation and/or other materials provided with the
   * distribution.
   *
   * 3.4. Intel retains all right, title, and interest in and to the Original
   * Intel Code.
   *
   * 3.5. Neither the name Intel nor any other trademark owned or controlled by
   * Intel shall be used in advertising or otherwise to promote the sale, use or
   * other dealings in products derived from or relating to the Covered Code
   * without prior written authorization from Intel.
   *
   * 4. Disclaimer and Export Compliance
   *
   * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
   * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
   * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
   * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
   * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
   * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
   * PARTICULAR PURPOSE.
   *
   * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
   * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
   * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
   * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
   * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
   * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
   * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
   * LIMITED REMEDY.
   *
   * 4.3. Licensee shall not export, either directly or indirectly, any of this
   * software or system incorporating such software without first obtaining any
   * required license or other approval from the U. S. Department of Commerce or
   * any other agency or department of the United States Government. In the
   * event Licensee exports any such software from the United States or
   * re-exports any such software from a foreign destination, Licensee shall
   * ensure that the distribution and export/re-export of the software is in
   * compliance with all laws, regulations, orders, or other restrictions of the
   * U.S. Export Administration Regulations. Licensee agrees that neither it nor
   * any of its subsidiaries will export/re-export any technical data, process,
   * software, or service, directly or indirectly, to any country for which the
   * United States government or any agency thereof requires an export license,
   * other governmental approval, or letter of assurance, without first obtaining
   * such license, approval or letter.
   *
   *****************************************************************************/
  
  #include "acpidump.h"
  #include <unistd.h>
  #include <sys/mman.h>
  #ifdef _FreeBSD
  #include <sys/param.h>
  #endif
  
  #define _COMPONENT          ACPI_OS_SERVICES
          ACPI_MODULE_NAME    ("osunixmap")
  
  
  #ifndef O_BINARY
  #define O_BINARY 0
  #endif
  
  #if defined(_DragonFly) || defined(_FreeBSD)
  #define MMAP_FLAGS          MAP_SHARED
  #else
  #define MMAP_FLAGS          MAP_PRIVATE
  #endif
  
  #define SYSTEM_MEMORY       "/dev/mem"
  
  
  /*******************************************************************************
   *
   * FUNCTION:    AcpiOsGetPageSize
   *
   * PARAMETERS:  None
   *
   * RETURN:      Page size of the platform.
   *
   * DESCRIPTION: Obtain page size of the platform.
   *
   ******************************************************************************/
  
  static ACPI_SIZE
  AcpiOsGetPageSize (
      void)
  {
  
  #ifdef PAGE_SIZE
      return PAGE_SIZE;
  #else
      return sysconf (_SC_PAGESIZE);
  #endif
  }
  
  
  /******************************************************************************
   *
   * FUNCTION:    AcpiOsMapMemory
   *
   * PARAMETERS:  Where               - Physical address of memory to be mapped
   *              Length              - How much memory to map
   *
   * RETURN:      Pointer to mapped memory. Null on error.
   *
   * DESCRIPTION: Map physical memory into local address space.
   *
   *****************************************************************************/
  
  void *
  AcpiOsMapMemory (
      ACPI_PHYSICAL_ADDRESS   Where,
      ACPI_SIZE               Length)
  {
      UINT8                   *MappedMemory;
      ACPI_PHYSICAL_ADDRESS   Offset;
      ACPI_SIZE               PageSize;
      int                     fd;
  
  
      fd = open (SYSTEM_MEMORY, O_RDONLY | O_BINARY);
      if (fd < 0)
      {
          fprintf (stderr, "Cannot open %s\n", SYSTEM_MEMORY);
          return (NULL);
      }
  
      /* Align the offset to use mmap */
  
      PageSize = AcpiOsGetPageSize ();
      Offset = Where % PageSize;
  
      /* Map the table header to get the length of the full table */
  
      MappedMemory = mmap (NULL, (Length + Offset), PROT_READ, MMAP_FLAGS,
          fd, (Where - Offset));
      if (MappedMemory == MAP_FAILED)
      {
          fprintf (stderr, "Cannot map %s\n", SYSTEM_MEMORY);
          close (fd);
          return (NULL);
      }
  
      close (fd);
      return (ACPI_CAST8 (MappedMemory + Offset));
  }
  
  
  /******************************************************************************
   *
   * FUNCTION:    AcpiOsUnmapMemory
   *
   * PARAMETERS:  Where               - Logical address of memory to be unmapped
   *              Length              - How much memory to unmap
   *
   * RETURN:      None.
   *
   * DESCRIPTION: Delete a previously created mapping. Where and Length must
   *              correspond to a previous mapping exactly.
   *
   *****************************************************************************/
  
  void
  AcpiOsUnmapMemory (
      void                    *Where,
      ACPI_SIZE               Length)
  {
      ACPI_PHYSICAL_ADDRESS   Offset;
      ACPI_SIZE               PageSize;
  
  
      PageSize = AcpiOsGetPageSize ();
      Offset = ACPI_TO_INTEGER (Where) % PageSize;
      munmap ((UINT8 *) Where - Offset, (Length + Offset));
  }
  