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 <soc/reg_access.h>
 
void fill_postcar_frame(struct postcar_frame *pcf)
{
        uintptr_t top_of_ram;
        uintptr_t top_of_low_usable_memory;
 
        /* Locate the top of RAM */
        top_of_low_usable_memory = (uintptr_t) cbmem_top();
        top_of_ram = ALIGN(top_of_low_usable_memory, 16 * MiB);
 
        /* Cache postcar and ramstage */
        postcar_frame_add_mtrr(pcf, top_of_ram - (16 * MiB), 16 * MiB,
                MTRR_TYPE_WRBACK);
 
        /* Cache RMU area */
        postcar_frame_add_mtrr(pcf, (uintptr_t) top_of_low_usable_memory,
                0x10000, MTRR_TYPE_WRTHROUGH);
 
        /* Cache ESRAM */
        postcar_frame_add_mtrr(pcf, 0x80000000, 0x80000, MTRR_TYPE_WRBACK);
 
        pcf->skip_common_mtrr = 1;
        /* Cache SPI flash - Write protect not supported */
        postcar_frame_add_romcache(pcf, MTRR_TYPE_WRTHROUGH);
}