memmap.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <arch/romstage.h>
#include <cbmem.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/smm.h>
#include <soc/iosf.h>
 
static uintptr_t smm_region_start(void)
{
        return (iosf_bunit_read(BUNIT_SMRRL) << 20);
}
 
static size_t smm_region_size(void)
{
        return CONFIG_SMM_TSEG_SIZE;
}
 
void *cbmem_top_chipset(void)
{
        return (void *) smm_region_start();
}
 
void smm_region(uintptr_t *start, size_t *size)
{
        *start = (iosf_bunit_read(BUNIT_SMRRL) & 0xFFFF) << 20;
        *size = smm_region_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);
}