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path: root/src/soc/intel/skylake/bootblock/timestamp.inc
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/*
 * 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