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117 lines
3.1 KiB
117 lines
3.1 KiB
// 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 - 2021, 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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