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vendorcode/amd/opensil: Implement cbmem_top_chipset 

Use an xPRF call to get the top of lower DRAM.

Organize Makefile to keep romstage/ramstage components separate.

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Signed-off-by: Martin Roth <gaumless@gmail.com>
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I269663414f4d8e39eb218cd6348bfce7989a79f9
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76513
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Varshit Pandya <pandyavarshit@gmail.com>
This commit is contained in:
Arthur Heymans 2023-07-13 18:31:13 +02:00 committed by Felix Held
parent 63ad72db6c
commit 98a46fb2dd
2 changed files with 28 additions and 1 deletions
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6
src/vendorcode/amd/opensil/genoa_poc/Makefile.inc
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@ -3,8 +3,12 @@
CPPFLAGS_ramstage += -I$(opensil_dir)/Include -I$(opensil_dir)/xUSL -I$(opensil_dir)/xUSL/Include -I$(opensil_dir)/xUSL/FCH -I$(opensil_dir)/xUSL/FCH/Common -I$(opensil_dir)/xSIM -I$(opensil_dir)/xPRF
CPPFLAGS_romstage += -I$(opensil_dir)/Include -I$(opensil_dir)/xUSL -I$(opensil_dir)/xUSL/Include -I$(opensil_dir)/xSIM -I$(opensil_dir)/xPRF
ramstage-y += opensil_console.c
romstage-y += opensil_console.c
romstage-y += romstage.c
ramstage-y += opensil_console.c
$(obj)/romstage/vendorcode/amd/opensil/genoa_poc/opensil_console.o: CFLAGS_romstage += -D_MSC_EXTENSIONS=0 -DHAS_STRING_H=1 -Wno-unknown-pragmas
$(obj)/romstage/vendorcode/amd/opensil/genoa_poc/romstage.o: CFLAGS_romstage += -D_MSC_EXTENSIONS=0 -DHAS_STRING_H=1 -Wno-unknown-pragmas
$(obj)/ramstage/vendorcode/amd/opensil/genoa_poc/opensil_console.o: CFLAGS_ramstage += -D_MSC_EXTENSIONS=0 -DHAS_STRING_H=1 -Wno-unknown-pragmas

23
src/vendorcode/amd/opensil/genoa_poc/romstage.c Normal file
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@ -0,0 +1,23 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <cbmem.h>
#include <console/console.h>
#include "opensil_console.h"
#include <xSIM-api.h>
#include <xPRF-api.h>
uintptr_t cbmem_top_chipset(void)
{
SilDebugSetup(HostDebugService);
uintptr_t top_mem = xPrfGetLowUsableDramAddress(0);
printk(BIOS_DEBUG, "xPrfGetLowUsableDramAddress: 0x%lx\n", top_mem);
/* The TSEG MSR has an 8M granularity. TSEG also needs to be aligned to its size so
account for potentially ill aligned TOP_MEM. */
if (CONFIG_SMM_TSEG_SIZE) {
top_mem -= CONFIG_SMM_TSEG_SIZE;
top_mem = ALIGN_DOWN(top_mem, CONFIG_SMM_TSEG_SIZE);
}
return top_mem;
}