car.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <arch/romstage.h>
#include <arch/symbols.h>
#include <cbfs.h>
#include <cbmem.h>
#include <console/console.h>
#include <commonlib/helpers.h>
#include <cpu/x86/mtrr.h>
#include <fsp/car.h>
#include <fsp/util.h>
 
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);
 
}
 
/* This is the romstage entry called from cpu/intel/car/romstage.c */
void mainboard_romstage_entry(void)
{
        /* Need to locate the current FSP_INFO_HEADER. The cache-as-ram
         * is still enabled. We can directly access work buffer here. */
        void *fsp = cbfs_map("fsp.bin", NULL);
 
        if (!fsp)
                die_with_post_code(POST_INVALID_CBFS, "Unable to locate fsp.bin");
 
        /* This leaks a mapping which this code assumes is benign as
         * the flash is memory mapped CPU's address space. */
        FSP_INFO_HEADER *fih = find_fsp((uintptr_t)fsp);
 
        if (!fih)
                die("Invalid FSP header\n");
 
        cache_as_ram_stage_main(fih);
}