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10#include "acpidump.h"
11#include <unistd.h>
12#include <sys/mman.h>
13#ifdef _free_BSD
14#include <sys/param.h>
15#endif
16
17#define _COMPONENT ACPI_OS_SERVICES
18ACPI_MODULE_NAME("osunixmap")
19
20#ifndef O_BINARY
21#define O_BINARY 0
22#endif
23#if defined(_dragon_fly) || defined(_free_BSD) || defined(_QNX)
24#define MMAP_FLAGS MAP_SHARED
25#else
26#define MMAP_FLAGS MAP_PRIVATE
27#endif
28#define SYSTEM_MEMORY "/dev/mem"
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40static acpi_size acpi_os_get_page_size(void)
41{
42
43#ifdef PAGE_SIZE
44 return PAGE_SIZE;
45#else
46 return sysconf(_SC_PAGESIZE);
47#endif
48}
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63void *acpi_os_map_memory(acpi_physical_address where, acpi_size length)
64{
65 u8 *mapped_memory;
66 acpi_physical_address offset;
67 acpi_size page_size;
68 int fd;
69
70 fd = open(SYSTEM_MEMORY, O_RDONLY | O_BINARY);
71 if (fd < 0) {
72 fprintf(stderr, "Cannot open %s\n", SYSTEM_MEMORY);
73 return (NULL);
74 }
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78 page_size = acpi_os_get_page_size();
79 offset = where % page_size;
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83 mapped_memory = mmap(NULL, (length + offset), PROT_READ, MMAP_FLAGS,
84 fd, (where - offset));
85 if (mapped_memory == MAP_FAILED) {
86 fprintf(stderr, "Cannot map %s\n", SYSTEM_MEMORY);
87 close(fd);
88 return (NULL);
89 }
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91 close(fd);
92 return (ACPI_CAST8(mapped_memory + offset));
93}
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109void acpi_os_unmap_memory(void *where, acpi_size length)
110{
111 acpi_physical_address offset;
112 acpi_size page_size;
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114 page_size = acpi_os_get_page_size();
115 offset = ACPI_TO_INTEGER(where) % page_size;
116 munmap((u8 *)where - offset, (length + offset));
117}
118