39883f622f
If -flto is used then gcc will generate a lot more warnings than before, among them a number of use-without-initialization warnings. Most of them without are false positives, but let's make them go away, because it doesn't really matter.
163 lines
4.7 KiB
C
163 lines
4.7 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 Kay Sievers
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <util.h>
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#include <fileio.h>
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#include <time-util.h>
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#include <acpi-fpdt.h>
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struct acpi_table_header {
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char signature[4];
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uint32_t length;
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uint8_t revision;
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uint8_t checksum;
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char oem_id[6];
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char oem_table_id[8];
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uint32_t oem_revision;
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char asl_compiler_id[4];
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uint32_t asl_compiler_revision;
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};
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enum {
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ACPI_FPDT_TYPE_BOOT = 0,
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ACPI_FPDT_TYPE_S3PERF = 1,
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};
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struct acpi_fpdt_header {
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uint16_t type;
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uint8_t length;
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uint8_t revision;
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uint8_t reserved[4];
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uint64_t ptr;
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};
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struct acpi_fpdt_boot_header {
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char signature[4];
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uint32_t length;
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};
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enum {
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ACPI_FPDT_S3PERF_RESUME_REC = 0,
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ACPI_FPDT_S3PERF_SUSPEND_REC = 1,
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ACPI_FPDT_BOOT_REC = 2,
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};
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struct acpi_fpdt_boot {
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uint16_t type;
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uint8_t length;
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uint8_t revision;
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uint8_t reserved[4];
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uint64_t reset_end;
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uint64_t load_start;
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uint64_t startup_start;
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uint64_t exit_services_entry;
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uint64_t exit_services_exit;
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};
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int acpi_get_boot_usec(usec_t *loader_start, usec_t *loader_exit) {
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_cleanup_free_ char *buf = NULL;
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struct acpi_table_header *tbl;
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size_t l = 0;
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struct acpi_fpdt_header *rec;
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int r;
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uint64_t ptr = 0;
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_cleanup_close_ int fd = -1;
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struct acpi_fpdt_boot_header hbrec;
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struct acpi_fpdt_boot brec;
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r = read_full_file("/sys/firmware/acpi/tables/FPDT", &buf, &l);
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if (r < 0)
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return r;
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if (l < sizeof(struct acpi_table_header) + sizeof(struct acpi_fpdt_header))
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return -EINVAL;
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tbl = (struct acpi_table_header *)buf;
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if (l != tbl->length)
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return -EINVAL;
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if (memcmp(tbl->signature, "FPDT", 4) != 0)
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return -EINVAL;
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/* find Firmware Basic Boot Performance Pointer Record */
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for (rec = (struct acpi_fpdt_header *)(buf + sizeof(struct acpi_table_header));
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(char *)rec < buf + l;
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rec = (struct acpi_fpdt_header *)((char *)rec + rec->length)) {
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if (rec->length <= 0)
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break;
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if (rec->type != ACPI_FPDT_TYPE_BOOT)
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continue;
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if (rec->length != sizeof(struct acpi_fpdt_header))
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continue;
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ptr = rec->ptr;
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break;
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}
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if (ptr == 0)
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return -EINVAL;
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/* read Firmware Basic Boot Performance Data Record */
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fd = open("/dev/mem", O_CLOEXEC|O_RDONLY);
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if (fd < 0)
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return -errno;
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l = pread(fd, &hbrec, sizeof(struct acpi_fpdt_boot_header), ptr);
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if (l != sizeof(struct acpi_fpdt_boot_header))
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return -EINVAL;
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if (memcmp(hbrec.signature, "FBPT", 4) != 0)
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return -EINVAL;
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if (hbrec.length < sizeof(struct acpi_fpdt_boot_header) + sizeof(struct acpi_fpdt_boot))
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return -EINVAL;
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l = pread(fd, &brec, sizeof(struct acpi_fpdt_boot), ptr + sizeof(struct acpi_fpdt_boot_header));
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if (l != sizeof(struct acpi_fpdt_boot))
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return -EINVAL;
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if (brec.length != sizeof(struct acpi_fpdt_boot))
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return -EINVAL;
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if (brec.type != ACPI_FPDT_BOOT_REC)
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return -EINVAL;
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if (brec.startup_start == 0 || brec.exit_services_exit < brec.startup_start)
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return -EINVAL;
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if (brec.exit_services_exit > NSEC_PER_HOUR)
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return -EINVAL;
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if (loader_start)
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*loader_start = brec.startup_start / 1000;
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if (loader_exit)
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*loader_exit = brec.exit_services_exit / 1000;
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return 0;
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}
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