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soc/intel/skylake: Use EBDA area to store cbmem_top address

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This patch uses BIOS EBDA area to store relevent details
like cbmem top during romstage after MRC init is done.
Also provide provision to use the same EBDA data across
various stages without reexecuting memory map algorithm.

BRANCH=none
BUG=b:63974384
TEST=Ensures HW based memmap algorithm is executing once in romstage
and store required data into EBDA for other stage to avoid redundant
calculation and get cbmem_top start from EBDA area.

Change-Id: Ib1a674efa5ab3a4fc076fc93236edd911d28b398
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/21424
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Subrata Banik
2017-09-21 19:22:22 +05:30
committed by Aaron Durbin
parent ef059c5a09
commit 7387e04a35
3 changed files with 45 additions and 1 deletions
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21
src/soc/intel/skylake/memmap.c
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@@ -14,12 +14,14 @@
* GNU General Public License for more details.
*/
#include <arch/ebda.h>
#include <arch/io.h>
#include <cbmem.h>
#include <chip.h>
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <intelblocks/ebda.h>
#include <intelblocks/systemagent.h>
#include <soc/msr.h>
#include <soc/pci_devs.h>
@@ -274,6 +276,18 @@ static uintptr_t calculate_dram_base(void)
return dram_base;
}
/* Fill up memory layout information */
void fill_soc_memmap_ebda(struct ebda_config *cfg)
{
cfg->tolum_base = calculate_dram_base();
}
void cbmem_top_init(void)
{
/* Fill up EBDA area */
fill_ebda_area();
}
/*
* +-------------------------+ Top of RAM (aligned)
* | System Management Mode |
@@ -303,6 +317,9 @@ static uintptr_t calculate_dram_base(void)
*/
void *cbmem_top(void)
{
struct ebda_config ebda_cfg;
struct ebda_config *cfg = &ebda_cfg;
/*
* Check if Tseg has been initialized, we will use this as a flag
* to check if the MRC is done, and only then continue to read the
@@ -312,5 +329,7 @@ void *cbmem_top(void)
if (sa_get_tseg_base() == 0)
return NULL;
return (void *)calculate_dram_base();
read_ebda_data(cfg, sizeof(*cfg));
return (void *)(uintptr_t)cfg->tolum_base;
}