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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2015 - 2017 Intel Corp.
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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 <cbmem.h>
#include <assert.h>
#include <device/device.h>
#include <device/pci_def.h>
#include <device/pci_ops.h>
#include <soc/pci_devs.h>
#include <soc/systemagent.h>
#include <soc/smm.h>
#include <lib.h>
/* Returns base of requested region encoded in the system agent. */
static inline uintptr_t system_agent_region_base(size_t reg)
{
#if defined(__SIMPLE_DEVICE__)
pci_devfn_t dev = SA_DEV_ROOT;
#else
struct device *dev = SA_DEV_ROOT;
#endif
/* All regions concerned for have 1 MiB alignment. */
return ALIGN_DOWN(pci_read_config32(dev, reg), 1 * MiB);
}
/* Returns min power of 2 >= size */
static inline u32 power_of_2(u32 size)
{
return size ? 1 << (1 + log2(size - 1)) : 0;
}
u32 top_of_32bit_ram(void)
{
u32 iqat_region_size = 0;
u32 tseg_region_size = system_agent_region_base(TOLUD) -
system_agent_region_base(TSEGMB);
/*
* Add IQAT region size if enabled.
*/
#if CONFIG(IQAT_ENABLE)
iqat_region_size = CONFIG_IQAT_MEMORY_REGION_SIZE;
#endif
return system_agent_region_base(TOLUD) -
power_of_2(iqat_region_size + tseg_region_size);
}
void *cbmem_top(void) { return (void *)top_of_32bit_ram(); }
static inline uintptr_t smm_region_start(void)
{
return system_agent_region_base(TSEGMB);
}
static inline size_t smm_region_size(void)
{
return system_agent_region_base(TOLUD) - smm_region_start();
}
void smm_region(void **start, size_t *size)
{
*start = (void *)smm_region_start();
*size = smm_region_size();
}
int smm_subregion(int sub, void **start, size_t *size)
{
uintptr_t sub_base;
size_t sub_size;
const size_t cache_size = CONFIG_SMM_RESERVED_SIZE;
sub_base = smm_region_start();
sub_size = smm_region_size();
assert(sub_size > CONFIG_SMM_RESERVED_SIZE);
switch (sub) {
case SMM_SUBREGION_HANDLER:
/* Handler starts at the base of TSEG. */
sub_size -= cache_size;
break;
case SMM_SUBREGION_CACHE:
/* External cache is in the middle of TSEG. */
sub_base += sub_size - cache_size;
sub_size = cache_size;
break;
default:
return -1;
}
*start = (void *)sub_base;
*size = sub_size;
return 0;
}
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