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timestamp: add generic cache region

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In order to accommodate tracking timestamps in all the
__PRE_RAM__ stages (bootblock, verstage, romstage, etc)
of a platform one needs to provide a way to specify
a persistent region of SRAM or cache-as-ram to store
the timestamps until cbmem comes online. Provide that
infrastructure.

Based on original patches from chromium.org:
Original-Change-Id: I4d78653c0595523eeeb02115423e7fecceea5e1e
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/223348
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>

Original-Change-Id: Ie5ffda3112d626068bd1904afcc5a09bc4916d16
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/224024
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>

Change-Id: I8779526136e89ae61a6f177ce5c74a6530469ae1
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/10790
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)
This commit is contained in:
Aaron Durbin
2015-07-03 17:04:21 -05:00
committed by Patrick Georgi
parent d17a8623a5
commit 1936f6cf25
6 changed files with 221 additions and 84 deletions
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5
src/arch/x86/init/romstage.ld
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@@ -52,6 +52,11 @@ SECTIONS
. = CONFIG_DCACHE_RAM_BASE;
.car.data . (NOLOAD) : {
_car_data_start = .;
#if IS_ENABLED(CONFIG_HAS_PRECBMEM_TIMESTAMP_REGION)
_timestamp = .;
. = . + 0x100;
_etimestamp = .;
#endif
*(.car.global_data);
_car_data_end = .;
/* The preram cbmem console area comes last to take advantage