summaryrefslogtreecommitdiff
path: root/src/soc/intel/broadwell/bootblock/timestamp.inc
blob: 3115c22c67147b4c2b29618a3e73c34fc3f33032 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
/*
 * This file is part of the coreboot project.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

/*
 * Store the initial timestamp for booting in mmx registers. This works
 * because the bootblock isn't being compiled with MMX support so mm0 and
 * mm1 will be preserved into romstage.
 */
	.code32

.global stash_timestamp
stash_timestamp:

	/* Save the BIST value */
	movl	%eax, %ebp

	finit
	rdtsc
	movd	%eax, %mm0
	movd	%edx, %mm1

	/* Restore the BIST value to %eax */
	movl	%ebp, %eax