c51d84dc09
Prefer firmware-provided performance data over loader-exported ones; if ACPI data is available, always use it, otherwise try to read the loader data. The firmware-provided variables start at the time the first EFI image is executed and end when the operating system exits the boot services; the (loader) time calculated in systemd-analyze increases.
66 lines
2 KiB
C
66 lines
2 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 2012 Lennart Poettering
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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 <unistd.h>
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#include "boot-timestamps.h"
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#include "acpi-fpdt.h"
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#include "efivars.h"
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int boot_timestamps(const dual_timestamp *n, dual_timestamp *firmware, dual_timestamp *loader) {
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usec_t x, y, a;
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int r;
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dual_timestamp _n;
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assert(firmware);
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assert(loader);
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if (!n) {
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dual_timestamp_get(&_n);
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n = &_n;
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}
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r = acpi_get_boot_usec(&x, &y);
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if (r < 0) {
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r = efi_loader_get_boot_usec(&x, &y);
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if (r < 0)
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return r;
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}
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/* Let's convert this to timestamps where the firmware
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* began/loader began working. To make this more confusing:
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* since usec_t is unsigned and the kernel's monotonic clock
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* begins at kernel initialization we'll actually initialize
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* the monotonic timestamps here as negative of the actual
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* value. */
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firmware->monotonic = y;
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loader->monotonic = y - x;
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a = n->monotonic + firmware->monotonic;
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firmware->realtime = n->realtime > a ? n->realtime - a : 0;
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a = n->monotonic + loader->monotonic;
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loader->realtime = n->realtime > a ? n->realtime - a : 0;
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return 0;
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}
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