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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 Google Inc.
* Copyright (C) 2015-2016 Intel Corporation.
*
* 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 <chip.h>
#include <device/device.h>
#include <device/pci.h>
#include <soc/msr.h>
#include <soc/pci_devs.h>
#include <soc/smm.h>
#include <soc/systemagent.h>
#include <stdlib.h>
size_t mmap_region_granularity(void)
{
if (IS_ENABLED(CONFIG_HAVE_SMI_HANDLER))
/* Align to TSEG size when SMM is in use */
if (CONFIG_SMM_TSEG_SIZE != 0)
return CONFIG_SMM_TSEG_SIZE;
/* Make it 8MiB by default. */
return 8*MiB;
}
/* Returns base of requested region encoded in the system agent. */
static inline uintptr_t system_agent_region_base(size_t reg)
{
/* All regions concerned for have 1 MiB alignment. */
return ALIGN_DOWN(pci_read_config32(SA_DEV_ROOT, reg), 1*MiB);
}
static inline uintptr_t smm_region_start(void)
{
return system_agent_region_base(TSEG);
}
static inline size_t smm_region_size(void)
{
return system_agent_region_base(BGSM) - smm_region_start();
}
void smm_region(void **start, size_t *size)
{
*start = (void *)smm_region_start();
*size = smm_region_size();
}
/*
* Subregions within SMM
* +-------------------------+ BGSM
* | IED | IED_REGION_SIZE
* +-------------------------+
* | External Stage Cache | SMM_RESERVED_SIZE
* +-------------------------+
* | code and data |
* | (TSEG) |
* +-------------------------+ TSEG
*/
int smm_subregion(int sub, void **start, size_t *size)
{
uintptr_t sub_base;
size_t sub_size;
const size_t ied_size = CONFIG_IED_REGION_SIZE;
const size_t cache_size = CONFIG_SMM_RESERVED_SIZE;
sub_base = smm_region_start();
sub_size = smm_region_size();
switch (sub) {
case SMM_SUBREGION_HANDLER:
/* Handler starts at the base of TSEG. */
sub_size -= ied_size;
sub_size -= cache_size;
break;
case SMM_SUBREGION_CACHE:
/* External cache is in the middle of TSEG. */
sub_base += sub_size - (ied_size + cache_size);
sub_size = cache_size;
break;
case SMM_SUBREGION_CHIPSET:
/* IED is at the top. */
sub_base += sub_size - ied_size;
sub_size = ied_size;
break;
default:
return -1;
}
*start = (void *)sub_base;
*size = sub_size;
return 0;
}
/*
* Host Memory Map:
*
* +--------------------------+ TOUUD
* | |
* +--------------------------+ 4GiB
* | PCI Address Space |
* +--------------------------+ TOLUD (also maps into MC address space)
* | iGD |
* +--------------------------+ BDSM
* | GTT |
* +--------------------------+ BGSM
* | TSEG |
* +--------------------------+ TSEGMB
* | DMA Protected Region |
* +--------------------------+ DPR
* | PRM (C6DRAM/SGX) |
* +--------------------------+ PRMRR
* | Trace Memory |
* +--------------------------+ top_of_ram
* | Reserved - FSP/CBMEM |
* +--------------------------+ TOLUM
* | Usage DRAM |
* +--------------------------+ 0
*
* Some of the base registers above can be equal making the size of those
* regions 0. The reason is because the memory controller internally subtracts
* the base registers from each other to determine sizes of the regions. In
* other words, the memory map is in a fixed order no matter what.
*/
u32 top_of_32bit_ram(void)
{
msr_t prmrr_base;
u32 top_of_ram;
const struct device *dev;
const struct soc_intel_skylake_config *config;
/*
* 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
* PRMMR_BASE MSR. The system hangs if PRMRR_BASE MSR is read before
* PRMRR_MASK MSR lock bit is set.
*/
if (smm_region_start() == 0)
return 0;
dev = dev_find_slot(0, PCI_DEVFN(SA_DEV_SLOT_ROOT, 0));
config = dev->chip_info;
/*
* On Skylake, cbmem_top is offset down from PRMRR_BASE by reserved
* memory (128MiB) for CPU trace if enabled, then reserved memory (4KB)
* for PTT if enabled. PTT is in fact not used on Skylake platforms.
* Refer to Fsp Integration Guide for the memory mapping layout.
*/
prmrr_base = rdmsr(UNCORE_PRMRR_PHYS_BASE_MSR);
top_of_ram = prmrr_base.lo;
if (config->ProbelessTrace)
top_of_ram -= TRACE_MEMORY_SIZE;
return top_of_ram;
}
void *cbmem_top(void)
{
/*
* +-------------------------+ Top of RAM (aligned)
* | System Management Mode |
* | code and data | Length: CONFIG_TSEG_SIZE
* | (TSEG) |
* +-------------------------+ SMM base (aligned)
* | |
* | Chipset Reserved Memory |
* | |
* +-------------------------+ top_of_ram (aligned)
* | |
* | CBMEM Root |
* | |
* +-------------------------+
* | |
* | FSP Reserved Memory |
* | |
* +-------------------------+
* | |
* | Various CBMEM Entries |
* | |
* +-------------------------+ top_of_stack (8 byte aligned)
* | |
* | stack (CBMEM Entry) |
* | |
* +-------------------------+
*/
return (void *)top_of_32bit_ram();
}
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