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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
c51d84dc KS |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2013 Kay Sievers | |
c51d84dc KS |
6 | ***/ |
7 | ||
a8fbdf54 | 8 | #include <errno.h> |
3ffd4af2 | 9 | #include <fcntl.h> |
a8fbdf54 | 10 | #include <stddef.h> |
c51d84dc KS |
11 | #include <stdint.h> |
12 | #include <string.h> | |
13 | #include <unistd.h> | |
c51d84dc | 14 | |
3ffd4af2 | 15 | #include "acpi-fpdt.h" |
cf0fbc49 | 16 | #include "alloc-util.h" |
3ffd4af2 LP |
17 | #include "fd-util.h" |
18 | #include "fileio.h" | |
19 | #include "time-util.h" | |
c51d84dc KS |
20 | |
21 | struct acpi_table_header { | |
22 | char signature[4]; | |
23 | uint32_t length; | |
24 | uint8_t revision; | |
25 | uint8_t checksum; | |
26 | char oem_id[6]; | |
27 | char oem_table_id[8]; | |
28 | uint32_t oem_revision; | |
29 | char asl_compiler_id[4]; | |
30 | uint32_t asl_compiler_revision; | |
31 | }; | |
32 | ||
33 | enum { | |
34 | ACPI_FPDT_TYPE_BOOT = 0, | |
35 | ACPI_FPDT_TYPE_S3PERF = 1, | |
36 | }; | |
37 | ||
38 | struct acpi_fpdt_header { | |
39 | uint16_t type; | |
40 | uint8_t length; | |
41 | uint8_t revision; | |
42 | uint8_t reserved[4]; | |
43 | uint64_t ptr; | |
44 | }; | |
45 | ||
46 | struct acpi_fpdt_boot_header { | |
47 | char signature[4]; | |
48 | uint32_t length; | |
49 | }; | |
50 | ||
51 | enum { | |
52 | ACPI_FPDT_S3PERF_RESUME_REC = 0, | |
53 | ACPI_FPDT_S3PERF_SUSPEND_REC = 1, | |
54 | ACPI_FPDT_BOOT_REC = 2, | |
55 | }; | |
56 | ||
57 | struct acpi_fpdt_boot { | |
58 | uint16_t type; | |
59 | uint8_t length; | |
60 | uint8_t revision; | |
61 | uint8_t reserved[4]; | |
62 | uint64_t reset_end; | |
63 | uint64_t load_start; | |
64 | uint64_t startup_start; | |
65 | uint64_t exit_services_entry; | |
66 | uint64_t exit_services_exit; | |
67 | }; | |
68 | ||
69 | int acpi_get_boot_usec(usec_t *loader_start, usec_t *loader_exit) { | |
2c64a8d0 | 70 | _cleanup_free_ char *buf = NULL; |
c51d84dc | 71 | struct acpi_table_header *tbl; |
39883f62 | 72 | size_t l = 0; |
c51d84dc KS |
73 | struct acpi_fpdt_header *rec; |
74 | int r; | |
75 | uint64_t ptr = 0; | |
76 | _cleanup_close_ int fd = -1; | |
77 | struct acpi_fpdt_boot_header hbrec; | |
78 | struct acpi_fpdt_boot brec; | |
79 | ||
80 | r = read_full_file("/sys/firmware/acpi/tables/FPDT", &buf, &l); | |
81 | if (r < 0) | |
82 | return r; | |
83 | ||
84 | if (l < sizeof(struct acpi_table_header) + sizeof(struct acpi_fpdt_header)) | |
85 | return -EINVAL; | |
86 | ||
87 | tbl = (struct acpi_table_header *)buf; | |
88 | if (l != tbl->length) | |
89 | return -EINVAL; | |
90 | ||
91 | if (memcmp(tbl->signature, "FPDT", 4) != 0) | |
92 | return -EINVAL; | |
93 | ||
94 | /* find Firmware Basic Boot Performance Pointer Record */ | |
95 | for (rec = (struct acpi_fpdt_header *)(buf + sizeof(struct acpi_table_header)); | |
96 | (char *)rec < buf + l; | |
97 | rec = (struct acpi_fpdt_header *)((char *)rec + rec->length)) { | |
f576cd20 PH |
98 | if (rec->length <= 0) |
99 | break; | |
c51d84dc KS |
100 | if (rec->type != ACPI_FPDT_TYPE_BOOT) |
101 | continue; | |
102 | if (rec->length != sizeof(struct acpi_fpdt_header)) | |
103 | continue; | |
104 | ||
105 | ptr = rec->ptr; | |
106 | break; | |
107 | } | |
108 | ||
109 | if (ptr == 0) | |
67a47c60 | 110 | return -ENODATA; |
c51d84dc KS |
111 | |
112 | /* read Firmware Basic Boot Performance Data Record */ | |
113 | fd = open("/dev/mem", O_CLOEXEC|O_RDONLY); | |
114 | if (fd < 0) | |
115 | return -errno; | |
116 | ||
117 | l = pread(fd, &hbrec, sizeof(struct acpi_fpdt_boot_header), ptr); | |
118 | if (l != sizeof(struct acpi_fpdt_boot_header)) | |
119 | return -EINVAL; | |
120 | ||
121 | if (memcmp(hbrec.signature, "FBPT", 4) != 0) | |
122 | return -EINVAL; | |
123 | ||
124 | if (hbrec.length < sizeof(struct acpi_fpdt_boot_header) + sizeof(struct acpi_fpdt_boot)) | |
125 | return -EINVAL; | |
126 | ||
127 | l = pread(fd, &brec, sizeof(struct acpi_fpdt_boot), ptr + sizeof(struct acpi_fpdt_boot_header)); | |
128 | if (l != sizeof(struct acpi_fpdt_boot)) | |
129 | return -EINVAL; | |
130 | ||
131 | if (brec.length != sizeof(struct acpi_fpdt_boot)) | |
132 | return -EINVAL; | |
133 | ||
134 | if (brec.type != ACPI_FPDT_BOOT_REC) | |
135 | return -EINVAL; | |
136 | ||
67a47c60 ZJS |
137 | if (brec.exit_services_exit == 0) |
138 | /* Non-UEFI compatible boot. */ | |
139 | return -ENODATA; | |
140 | ||
6c798009 KS |
141 | if (brec.startup_start == 0 || brec.exit_services_exit < brec.startup_start) |
142 | return -EINVAL; | |
143 | if (brec.exit_services_exit > NSEC_PER_HOUR) | |
144 | return -EINVAL; | |
145 | ||
c51d84dc KS |
146 | if (loader_start) |
147 | *loader_start = brec.startup_start / 1000; | |
148 | if (loader_exit) | |
149 | *loader_exit = brec.exit_services_exit / 1000; | |
150 | ||
151 | return 0; | |
152 | } |