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/* SPDX-License-Identifier: LGPL-2.1+ */
#include "acpi-fpdt.h"
#include "boot-timestamps.h"
#include "efi-loader.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;
}
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