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/* SPDX-License-Identifier: GPL-2.0-only */
#include <arch/romstage.h>
#include <cbmem.h>
#include <console/console.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/smm.h>
#include <intelblocks/systemagent.h>
/*
* Expected Host Memory Map (we don't know 100% and not all regions are present on all SoCs):
*
* +---------------------------+ TOUUD
* | |
* +---------------------------+ TOM (if mem > 4GB)
* | CSME UMA (if mem > 4 GiB) |
* +---------------------------+ TOUUD
* | |
* +---------------------------+ 4GiB
* | PCI Address Space |
* +---------------------------+ TOM (if mem < 4GB)
* | CSME UMA (if mem < 4 GiB) |
* +---------------------------+ TOLUD (also maps into MC address space)
* | iGD / DSM |
* +---------------------------+ BDSM
* | GTT / GSM |
* +---------------------------+ TOLM
* | TSEG |
* +---------------------------+ TSEGMB
* | DMA Protected Region |
* +---------------------------+ DPR
* | PRM (C6DRAM/SGX) |
* +---------------------------+ PRMRR
* | Probeless Trace |
* +---------------------------+ ME Stolen
* | PTT |
* +---------------------------+ TOLUM / top_of_ram / cbmem_top
* | CBMEM Root |
* +---------------------------+
* | FSP Reserved Memory |
* +---------------------------+
* | various CBMEM entries |
* +---------------------------+ top_of_stack (8 byte aligned)
* | stack (CBMEM entry) |
* +---------------------------+ FSP TOLUM
* | |
* +---------------------------+ 0
*/
void smm_region(uintptr_t *start, size_t *size)
{
*start = sa_get_tseg_base();
*size = sa_get_tseg_size();
}
void fill_postcar_frame(struct postcar_frame *pcf)
{
uintptr_t top_of_ram;
/*
* We need to make sure ramstage will be run cached. At this
* point exact location of ramstage in cbmem is not known.
* Instruct postcar to cache 16 megs under cbmem top which is
* a safe bet to cover ramstage.
*/
top_of_ram = (uintptr_t) cbmem_top();
printk(BIOS_DEBUG, "top_of_ram = 0x%lx\n", top_of_ram);
top_of_ram -= 16*MiB;
postcar_frame_add_mtrr(pcf, top_of_ram, 16*MiB, MTRR_TYPE_WRBACK);
/* Cache the TSEG region */
postcar_enable_tseg_cache(pcf);
}
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