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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 /****************************************************************************** * * Module Name: osunixmap - Unix OSL for file mappings * * Copyright (C) 2000 - 2022, Intel Corp. * *****************************************************************************/ #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)); } |