/*** This file is part of systemd. Copyright 2012 Lennart Poettering Copyright 2013 Kay Sievers systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include "acpi-fpdt.h" #include "boot-timestamps.h" #include "efivars.h" #include "macro.h" #include "time-util.h" int boot_timestamps(const dual_timestamp *n, dual_timestamp *firmware, dual_timestamp *loader) { usec_t x = 0, y = 0, a; int r; dual_timestamp _n; assert(firmware); assert(loader); if (!n) { dual_timestamp_get(&_n); n = &_n; } r = acpi_get_boot_usec(&x, &y); if (r < 0) { r = efi_loader_get_boot_usec(&x, &y); if (r < 0) return r; } /* Let's convert this to timestamps where the firmware * began/loader began working. To make this more confusing: * since usec_t is unsigned and the kernel's monotonic clock * begins at kernel initialization we'll actually initialize * the monotonic timestamps here as negative of the actual * value. */ firmware->monotonic = y; loader->monotonic = y - x; a = n->monotonic + firmware->monotonic; firmware->realtime = n->realtime > a ? n->realtime - a : 0; a = n->monotonic + loader->monotonic; loader->realtime = n->realtime > a ? n->realtime - a : 0; return 0; }