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/* SPDX-License-Identifier: GPL-2.0-only */
/* Use simple device model for this file even in ramstage */
#define __SIMPLE_DEVICE__
#include <arch/romstage.h>
#include <commonlib/helpers.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/smm.h>
#include <device/pci_ops.h>
#include <cbmem.h>
#include "haswell.h"
static uintptr_t smm_region_start(void)
{
/*
* Base of TSEG is top of usable DRAM below 4GiB. The register has
* 1 MiB alignment.
*/
uintptr_t tom = pci_read_config32(HOST_BRIDGE, TSEG);
return tom & ~((1 << 20) - 1);
}
void *cbmem_top_chipset(void)
{
return (void *)smm_region_start();
}
void smm_region(uintptr_t *start, size_t *size)
{
*start = smm_region_start();
*size = CONFIG_SMM_TSEG_SIZE;
}
void fill_postcar_frame(struct postcar_frame *pcf)
{
uintptr_t top_of_ram;
/* Cache at least 8 MiB below the top of ram, and at most 8 MiB
* above top of the ram. This satisfies MTRR alignment requirement
* with different TSEG size configurations.
*/
top_of_ram = ALIGN_DOWN((uintptr_t)cbmem_top(), 8 * MiB);
postcar_frame_add_mtrr(pcf, top_of_ram - 8 * MiB, 16 * MiB, MTRR_TYPE_WRBACK);
}
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