1 files changed, 46 insertions, 0 deletions
diff --git a/arch/x86/lib/init_helpers.c b/arch/x86/lib/init_helpers.c
new file mode 100644
index 00000000000..bd0efde00c1
--- /dev/null
+++ b/arch/x86/lib/init_helpers.c
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2011
+ * Graeme Russ, <graeme.russ@gmail.com>
+ */
+
+#include <init.h>
+#include <asm/global_data.h>
+#include <linux/errno.h>
+#include <asm/mtrr.h>
+#include <asm/u-boot-x86.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int init_cache_f_r(void)
+{
+	bool do_mtrr = CONFIG_IS_ENABLED(X86_32BIT_INIT) ||
+		 IS_ENABLED(CONFIG_FSP_VERSION2) ||
+		 (IS_ENABLED(CONFIG_TPL) && IS_ENABLED(CONFIG_HAVE_MRC));
+	int ret;
+
+	/*
+	 * Supported configurations:
+	 *
+	 * booting from slimbootloader - MTRRs are already set up
+	 * booting with FSPv1 - MTRRs are already set up
+	 * booting with FSPv2 or MRC - MTRRs must be set here
+	 * booting from coreboot - in this case there is no SPL, so we set up
+	 *	the MTRRs here
+	 */
+	do_mtrr &= !IS_ENABLED(CONFIG_FSP_VERSION1) &&
+		!IS_ENABLED(CONFIG_SYS_SLIMBOOTLOADER);
+
+	if (do_mtrr) {
+		ret = mtrr_commit(false);
+		/*
+		 * If MTRR MSR is not implemented by the processor, just ignore
+		 * it
+		 */
+		if (ret && ret != -ENOSYS)
+			return ret;
+	}
+
+	/* Initialise the CPU cache(s) */
+	return init_cache();
+}