| /****************************************************************************** |
| * |
| * Module Name: osunixmap - Unix OSL for file mappings |
| * |
| *****************************************************************************/ |
| |
| /* |
| * Copyright (C) 2000 - 2015, Intel Corp. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions, and the following disclaimer, |
| * without modification. |
| * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
| * substantially similar to the "NO WARRANTY" disclaimer below |
| * ("Disclaimer") and any redistribution must be conditioned upon |
| * including a substantially similar Disclaimer requirement for further |
| * binary redistribution. |
| * 3. Neither the names of the above-listed copyright holders nor the names |
| * of any contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * Alternatively, this software may be distributed under the terms of the |
| * GNU General Public License ("GPL") version 2 as published by the Free |
| * Software Foundation. |
| * |
| * NO WARRANTY |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGES. |
| */ |
| |
| #include "acpidump.h" |
| #include <unistd.h> |
| #include <sys/mman.h> |
| #ifdef _free_BSD |
| #include <sys/param.h> |
| #endif |
| |
| #define _COMPONENT ACPI_OS_SERVICES |
| ACPI_MODULE_NAME("osunixmap") |
| |
| #ifndef O_BINARY |
| #define O_BINARY 0 |
| #endif |
| #ifdef _free_BSD |
| #define MMAP_FLAGS MAP_SHARED |
| #else |
| #define MMAP_FLAGS MAP_PRIVATE |
| #endif |
| #define SYSTEM_MEMORY "/dev/mem" |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_os_get_page_size |
| * |
| * PARAMETERS: None |
| * |
| * RETURN: Page size of the platform. |
| * |
| * DESCRIPTION: Obtain page size of the platform. |
| * |
| ******************************************************************************/ |
| static acpi_size acpi_os_get_page_size(void) |
| { |
| |
| #ifdef PAGE_SIZE |
| return PAGE_SIZE; |
| #else |
| return sysconf(_SC_PAGESIZE); |
| #endif |
| } |
| |
| /****************************************************************************** |
| * |
| * FUNCTION: acpi_os_map_memory |
| * |
| * 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 *acpi_os_map_memory(acpi_physical_address where, acpi_size length) |
| { |
| u8 *mapped_memory; |
| acpi_physical_address offset; |
| acpi_size page_size; |
| 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 */ |
| |
| page_size = acpi_os_get_page_size(); |
| offset = where % page_size; |
| |
| /* Map the table header to get the length of the full table */ |
| |
| mapped_memory = mmap(NULL, (length + offset), PROT_READ, MMAP_FLAGS, |
| fd, (where - offset)); |
| if (mapped_memory == MAP_FAILED) { |
| fprintf(stderr, "Cannot map %s\n", SYSTEM_MEMORY); |
| close(fd); |
| return (NULL); |
| } |
| |
| close(fd); |
| return (ACPI_CAST8(mapped_memory + offset)); |
| } |
| |
| /****************************************************************************** |
| * |
| * FUNCTION: acpi_os_unmap_memory |
| * |
| * 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 acpi_os_unmap_memory(void *where, acpi_size length) |
| { |
| acpi_physical_address offset; |
| acpi_size page_size; |
| |
| page_size = acpi_os_get_page_size(); |
| offset = (acpi_physical_address) where % page_size; |
| munmap((u8 *)where - offset, (length + offset)); |
| } |