From 20f71369d95d9691e668455b2262c80997fc8c3f Mon Sep 17 00:00:00 2001 From: Arthur Heymans Date: Tue, 10 Apr 2018 16:15:09 +0200 Subject: nb/intel/pineview: Put stage cache in TSEG TSEG is not accessible in ring 0 after it is locked in ramstage, in contrast with cbmem which remains accessible. Assuming SMM does not touch the cache this is a good region to cache stages. Tested on Foxconn D41S. Change-Id: I3d163e8ff328ba01425b524a673f34a96fb93ea7 Signed-off-by: Arthur Heymans Reviewed-on: https://review.coreboot.org/c/25605 Reviewed-by: Patrick Georgi Tested-by: build bot (Jenkins) --- src/northbridge/intel/pineview/stage_cache.c | 32 ++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 src/northbridge/intel/pineview/stage_cache.c (limited to 'src/northbridge/intel/pineview/stage_cache.c') diff --git a/src/northbridge/intel/pineview/stage_cache.c b/src/northbridge/intel/pineview/stage_cache.c new file mode 100644 index 0000000000..3e2f882827 --- /dev/null +++ b/src/northbridge/intel/pineview/stage_cache.c @@ -0,0 +1,32 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2015 Google, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include "pineview.h" + +void stage_cache_external_region(void **base, size_t *size) +{ + /* + * The ramstage cache lives in the TSEG region at RESERVED_SMM_OFFSET. + * The top of RAM is defined to be the TSEG base address. + */ + *size = CONFIG_SMM_RESERVED_SIZE; + *base = (void *)(northbridge_get_tseg_base() + + CONFIG_SMM_RESERVED_SIZE); +} -- cgit v1.2.3