118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: osunixmap - Unix OSL for file mappings
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*
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* Copyright (C) 2000 - 2022, Intel Corp.
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*
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*****************************************************************************/
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#include "acpidump.h"
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#include <unistd.h>
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#include <sys/mman.h>
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#ifdef _free_BSD
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#include <sys/param.h>
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#endif
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#define _COMPONENT ACPI_OS_SERVICES
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ACPI_MODULE_NAME("osunixmap")
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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#if defined(_dragon_fly) || defined(_free_BSD) || defined(_QNX)
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#define MMAP_FLAGS MAP_SHARED
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#else
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#define MMAP_FLAGS MAP_PRIVATE
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#endif
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#define SYSTEM_MEMORY "/dev/mem"
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/*******************************************************************************
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*
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* FUNCTION: acpi_os_get_page_size
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*
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* PARAMETERS: None
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*
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* RETURN: Page size of the platform.
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*
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* DESCRIPTION: Obtain page size of the platform.
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*
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******************************************************************************/
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static acpi_size acpi_os_get_page_size(void)
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{
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#ifdef PAGE_SIZE
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return PAGE_SIZE;
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#else
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return sysconf(_SC_PAGESIZE);
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#endif
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}
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/******************************************************************************
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*
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* FUNCTION: acpi_os_map_memory
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*
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* PARAMETERS: where - Physical address of memory to be mapped
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* length - How much memory to map
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*
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* RETURN: Pointer to mapped memory. Null on error.
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*
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* DESCRIPTION: Map physical memory into local address space.
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*
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*****************************************************************************/
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void *acpi_os_map_memory(acpi_physical_address where, acpi_size length)
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{
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u8 *mapped_memory;
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acpi_physical_address offset;
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acpi_size page_size;
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int fd;
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fd = open(SYSTEM_MEMORY, O_RDONLY | O_BINARY);
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if (fd < 0) {
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fprintf(stderr, "Cannot open %s\n", SYSTEM_MEMORY);
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return (NULL);
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}
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/* Align the offset to use mmap */
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page_size = acpi_os_get_page_size();
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offset = where % page_size;
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/* Map the table header to get the length of the full table */
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mapped_memory = mmap(NULL, (length + offset), PROT_READ, MMAP_FLAGS,
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fd, (where - offset));
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if (mapped_memory == MAP_FAILED) {
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fprintf(stderr, "Cannot map %s\n", SYSTEM_MEMORY);
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close(fd);
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return (NULL);
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}
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close(fd);
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return (ACPI_CAST8(mapped_memory + offset));
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}
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/******************************************************************************
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*
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* FUNCTION: acpi_os_unmap_memory
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*
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* PARAMETERS: where - Logical address of memory to be unmapped
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* length - How much memory to unmap
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*
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* RETURN: None.
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*
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* DESCRIPTION: Delete a previously created mapping. Where and Length must
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* correspond to a previous mapping exactly.
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*
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*****************************************************************************/
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void acpi_os_unmap_memory(void *where, acpi_size length)
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{
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acpi_physical_address offset;
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acpi_size page_size;
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page_size = acpi_os_get_page_size();
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offset = ACPI_TO_INTEGER(where) % page_size;
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munmap((u8 *)where - offset, (length + offset));
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}
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