From 1936f6cf25bee5a0eb313d6734df7af871757e7c Mon Sep 17 00:00:00 2001 From: Aaron Durbin Date: Fri, 3 Jul 2015 17:04:21 -0500 Subject: timestamp: add generic cache region 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 Original-Reviewed-on: https://chromium-review.googlesource.com/223348 Original-Reviewed-by: Aaron Durbin Original-Reviewed-by: Patrick Georgi Original-Tested-by: Furquan Shaikh Original-Commit-Queue: Furquan Shaikh Original-Change-Id: Ie5ffda3112d626068bd1904afcc5a09bc4916d16 Original-Signed-off-by: Furquan Shaikh Original-Reviewed-on: https://chromium-review.googlesource.com/224024 Original-Reviewed-by: Furquan Shaikh Original-Commit-Queue: Furquan Shaikh Original-Tested-by: Furquan Shaikh Change-Id: I8779526136e89ae61a6f177ce5c74a6530469ae1 Signed-off-by: Aaron Durbin Reviewed-on: http://review.coreboot.org/10790 Reviewed-by: Stefan Reinauer Tested-by: build bot (Jenkins) --- src/arch/x86/init/romstage.ld | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'src/arch') diff --git a/src/arch/x86/init/romstage.ld b/src/arch/x86/init/romstage.ld index 7b9cb6aa45..951ca656a3 100644 --- a/src/arch/x86/init/romstage.ld +++ b/src/arch/x86/init/romstage.ld @@ -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 -- cgit v1.2.3