1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2011
4  * Graeme Russ, <graeme.russ@gmail.com>
5  */
6 
7 #include <init.h>
8 #include <asm/global_data.h>
9 #include <linux/errno.h>
10 #include <asm/mtrr.h>
11 #include <asm/u-boot-x86.h>
12 
13 DECLARE_GLOBAL_DATA_PTR;
14 
init_cache_f_r(void)15 int init_cache_f_r(void)
16 {
17 	bool do_mtrr = CONFIG_IS_ENABLED(X86_32BIT_INIT) ||
18 		 IS_ENABLED(CONFIG_FSP_VERSION2) ||
19 		 (IS_ENABLED(CONFIG_TPL) && IS_ENABLED(CONFIG_HAVE_MRC));
20 	int ret;
21 
22 	/*
23 	 * Supported configurations:
24 	 *
25 	 * booting from slimbootloader - MTRRs are already set up
26 	 * booting with FSPv1 - MTRRs are already set up
27 	 * booting with FSPv2 or MRC - 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 	 */
31 	do_mtrr &= !IS_ENABLED(CONFIG_FSP_VERSION1) &&
32 		!IS_ENABLED(CONFIG_SYS_SLIMBOOTLOADER);
33 
34 	if (do_mtrr) {
35 		ret = mtrr_commit(false);
36 		/*
37 		 * If MTRR MSR is not implemented by the processor, just ignore
38 		 * it
39 		 */
40 		if (ret && ret != -ENOSYS)
41 			return ret;
42 	}
43 
44 	/* Initialise the CPU cache(s) */
45 	return init_cache();
46 }
47