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