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sandy/ivybridge: use LAPIC timer in SMM 

This fixes an issue with using the flash driver in SMM for writing
the event log through an SMM call.

Change-Id: If18c77634cca4563f770f09b0f0797ece24308ce
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/10762
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
This commit is contained in:
Stefan Reinauer 2015-07-01 16:58:36 -07:00
parent cdf8ee6071
commit a3aa8da2ac
3 changed files with 3 additions and 56 deletions
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3
src/cpu/x86/lapic/Makefile.inc
View File

@ -3,5 +3,8 @@ ramstage-y += lapic_cpu_init.c
ramstage-y += secondary.S
romstage-$(CONFIG_UDELAY_LAPIC) += apic_timer.c
ramstage-$(CONFIG_UDELAY_LAPIC) += apic_timer.c
ifeq ($(CONFIG_LAPIC_MONOTONIC_TIMER),y)
smm-$(CONFIG_UDELAY_LAPIC) += apic_timer.c
endif
romstage-y += boot_cpu.c
ramstage-y += boot_cpu.c

1
src/northbridge/intel/sandybridge/Makefile.inc
View File

@ -42,7 +42,6 @@ romstage-y += early_init.c
romstage-y += report_platform.c
romstage-y += ../../../arch/x86/lib/walkcbfs.S
smm-$(CONFIG_HAVE_SMI_HANDLER) += udelay.c
smm-$(CONFIG_HAVE_SMI_HANDLER) += finalize.c
# We don't ship that, but booting without it is bound to fail

55
src/northbridge/intel/sandybridge/udelay.c
View File

@ -1,55 +0,0 @@
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007-2008 coresystems GmbH
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.
*/
#include <delay.h>
#include <stdint.h>
#include <cpu/x86/tsc.h>
#include <cpu/x86/msr.h>
/**
* Intel Sandy Bridge/Ivy Bridge CPUs always run the TSC at BCLK=100MHz
*/
void udelay(u32 us)
{
u32 dword;
tsc_t tsc, tsc1, tscd;
msr_t msr;
u32 fsb = 100, divisor;
u32 d; /* ticks per us */
msr = rdmsr(0xce);
divisor = (msr.lo >> 8) & 0xff;
d = fsb * divisor; /* On Core/Core2 this is divided by 4 */
multiply_to_tsc(&tscd, us, d);
tsc1 = rdtsc();
dword = tsc1.lo + tscd.lo;
if ((dword < tsc1.lo) || (dword < tscd.lo)) {
tsc1.hi++;
}
tsc1.lo = dword;
tsc1.hi += tscd.hi;
do {
tsc = rdtsc();
} while ((tsc.hi < tsc1.hi)
|| ((tsc.hi == tsc1.hi) && (tsc.lo < tsc1.lo)));
}