47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include "acpi-fpdt.h"
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#include "boot-timestamps.h"
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#include "efi-loader.h"
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#include "macro.h"
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#include "time-util.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 = 0, y = 0, 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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