[coreboot-gerrit] Change in coreboot[master]: nb/intel/i945: Put stage cache in TSEG
Arthur Heymans (Code Review)
gerrit at coreboot.org
Tue Apr 10 16:18:36 CEST 2018
Arthur Heymans has uploaded this change for review. ( https://review.coreboot.org/25603
Change subject: nb/intel/i945: Put stage cache in TSEG
......................................................................
nb/intel/i945: 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.
Untested.
Change-Id: I447815bb0acf5f8e53834b74785d496f9d4df1da
Signed-off-by: Arthur Heymans <arthur at aheymans.xyz>
---
M src/northbridge/intel/i945/Kconfig
M src/northbridge/intel/i945/Makefile.inc
A src/northbridge/intel/i945/stage_cache.c
3 files changed, 52 insertions(+), 0 deletions(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/03/25603/1
diff --git a/src/northbridge/intel/i945/Kconfig b/src/northbridge/intel/i945/Kconfig
index 05e2d49..9b3777b 100644
--- a/src/northbridge/intel/i945/Kconfig
+++ b/src/northbridge/intel/i945/Kconfig
@@ -30,6 +30,7 @@
select HAVE_VGA_TEXT_FRAMEBUFFER if MAINBOARD_DO_NATIVE_VGA_INIT
select SMM_TSEG
select PARALLEL_MP
+ select CACHE_RELOCATED_RAMSTAGE_OUTSIDE_CBMEM
config NORTHBRIDGE_INTEL_SUBTYPE_I945GC
def_bool n
@@ -89,4 +90,14 @@
On other boards the check always creates a false positive,
effectively making it impossible to resume.
+config SMM_RESERVED_SIZE
+ hex
+ default 0x100000
+
+# Intel Enhanced Debug region must be 4MB
+config IED_REGION_SIZE
+ hex
+ default 0x400000
+
+
endif
diff --git a/src/northbridge/intel/i945/Makefile.inc b/src/northbridge/intel/i945/Makefile.inc
index 0e4fcfc..0772212 100644
--- a/src/northbridge/intel/i945/Makefile.inc
+++ b/src/northbridge/intel/i945/Makefile.inc
@@ -29,4 +29,7 @@
smm-y += udelay.c
+romstage-$(CONFIG_CACHE_RELOCATED_RAMSTAGE_OUTSIDE_CBMEM) += stage_cache.c
+ramstage-$(CONFIG_CACHE_RELOCATED_RAMSTAGE_OUTSIDE_CBMEM) += stage_cache.c
+
endif
diff --git a/src/northbridge/intel/i945/stage_cache.c b/src/northbridge/intel/i945/stage_cache.c
new file mode 100644
index 0000000..e1e2ffb
--- /dev/null
+++ b/src/northbridge/intel/i945/stage_cache.c
@@ -0,0 +1,38 @@
+/*
+ * 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 <arch/io.h>
+#include <cbmem.h>
+#include <device/pci.h>
+#include <stage_cache.h>
+#include "i945.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;
+#ifdef __SIMPLE_DEVICE__
+ const u8 esmramc = pci_read_config8(PCI_DEV(0, 0x00, 0), ESMRAMC);
+#else
+ const u8 esmramc = pci_read_config8(dev_find_slot(0, PCI_DEVFN(0, 0)),
+ ESMRAMC);
+#endif
+ const u32 tseg_size = decode_tseg_size(esmramc);
+ *base = (void *)((uintptr_t)cbmem_top() + tseg_size
+ - CONFIG_SMM_RESERVED_SIZE - CONFIG_IED_REGION_SIZE);
+}
--
To view, visit https://review.coreboot.org/25603
To unsubscribe, or for help writing mail filters, visit https://review.coreboot.org/settings
Gerrit-Project: coreboot
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I447815bb0acf5f8e53834b74785d496f9d4df1da
Gerrit-Change-Number: 25603
Gerrit-PatchSet: 1
Gerrit-Owner: Arthur Heymans <arthur at aheymans.xyz>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.coreboot.org/pipermail/coreboot-gerrit/attachments/20180410/d17e5c73/attachment-0001.html>
More information about the coreboot-gerrit
mailing list