Line data    Source code

       1             : /* SPDX-License-Identifier: LGPL-2.1+ */
       2             : 
       3             : #include "acpi-fpdt.h"
       4             : #include "boot-timestamps.h"
       5             : #include "efivars.h"
       6             : #include "macro.h"
       7             : #include "time-util.h"
       8             : 
       9           1 : int boot_timestamps(const dual_timestamp *n, dual_timestamp *firmware, dual_timestamp *loader) {
      10           1 :         usec_t x = 0, y = 0, a;
      11             :         int r;
      12             :         dual_timestamp _n;
      13             : 
      14           1 :         assert(firmware);
      15           1 :         assert(loader);
      16             : 
      17           1 :         if (!n) {
      18           1 :                 dual_timestamp_get(&_n);
      19           1 :                 n = &_n;
      20             :         }
      21             : 
      22           1 :         r = acpi_get_boot_usec(&x, &y);
      23           1 :         if (r < 0) {
      24           1 :                 r = efi_loader_get_boot_usec(&x, &y);
      25           1 :                 if (r < 0)
      26           1 :                         return r;
      27             :         }
      28             : 
      29             :         /* Let's convert this to timestamps where the firmware
      30             :          * began/loader began working. To make this more confusing:
      31             :          * since usec_t is unsigned and the kernel's monotonic clock
      32             :          * begins at kernel initialization we'll actually initialize
      33             :          * the monotonic timestamps here as negative of the actual
      34             :          * value. */
      35             : 
      36           0 :         firmware->monotonic = y;
      37           0 :         loader->monotonic = y - x;
      38             : 
      39           0 :         a = n->monotonic + firmware->monotonic;
      40           0 :         firmware->realtime = n->realtime > a ? n->realtime - a : 0;
      41             : 
      42           0 :         a = n->monotonic + loader->monotonic;
      43           0 :         loader->realtime = n->realtime > a ? n->realtime - a : 0;
      44             : 
      45           0 :         return 0;
      46             : }