LXR uboot/arch/x86/lib/init

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2011
   4 * Graeme Russ, <graeme.russ@gmail.com>
   5 */
   6
   7#include <common.h>
   8#include <init.h>
   9#include <asm/global_data.h>
  10#include <linux/errno.h>
  11#include <asm/mtrr.h>
  12
  13DECLARE_GLOBAL_DATA_PTR;
  14
  15int init_cache_f_r(void)
  16{
  17        bool do_mtrr = CONFIG_IS_ENABLED(X86_32BIT_INIT) ||
  18                 IS_ENABLED(CONFIG_FSP_VERSION2);
  19        int ret;
  20
  21        /*
  22         * Supported configurations:
  23         *
  24         * booting from slimbootloader - in that case the MTRRs are already set
  25         *      up
  26         * booting with FSPv1 - MTRRs are already set up
  27         * booting with FSPv2 - MTRRs must be set here
  28         * booting from coreboot - in this case there is no SPL, so we set up
  29         *      the MTRRs here
  30         * Note: if there is an SPL, then it has already set up MTRRs so we
  31         *      don't need to do that here
  32         */
  33        do_mtrr &= !IS_ENABLED(CONFIG_SPL) &&
  34                !IS_ENABLED(CONFIG_FSP_VERSION1) &&
  35                !IS_ENABLED(CONFIG_SYS_SLIMBOOTLOADER);
  36
  37        if (do_mtrr) {
  38                ret = mtrr_commit(false);
  39                /*
  40                 * If MTRR MSR is not implemented by the processor, just ignore
  41                 * it
  42                 */
  43                if (ret && ret != -ENOSYS)
  44                        return ret;
  45        }
  46
  47        /* Initialise the CPU cache(s) */
  48        return init_cache();
  49}
  50