151 lines
4.8 KiB
C
151 lines
4.8 KiB
C
/******************************************************************************
|
|
*
|
|
* Module Name: osunixmap - Unix OSL for file mappings
|
|
*
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* Copyright (C) 2000 - 2016, 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
|
|
#if defined(_dragon_fly) || defined(_free_BSD) || defined(_QNX)
|
|
#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_TO_INTEGER(where) % page_size;
|
|
munmap((u8 *)where - offset, (length + offset));
|
|
}
|