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authorStefan Reinauer <stepan@coresystems.de>2009-07-21 21:19:06 +0000
committerStefan Reinauer <stepan@openbios.org>2009-07-21 21:19:06 +0000
commit4fbefdd1a9c67e3ce2a215192e47278148580c2f (patch)
tree2e7ca0b42bf30f63c463552a7c40ebefc3ea1c42 /src/cpu
parent925b6c0c43b92b4790533b15f78ca824f9130d8b (diff)
downloadcoreboot-4fbefdd1a9c67e3ce2a215192e47278148580c2f.tar.xz
* rework tsc based timer code to use inb instead of outb for calibration
* Add generic Local APIC based timer code. This timer does not need expensive calibration and thus reduces the boot time by up to more than a second. Signed-off-by: Stefan Reinauer <stepan@coresystems.de> Acked-by: Peter Stuge <peter@stuge.se> Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4446 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/cpu')
-rw-r--r--src/cpu/x86/lapic/Config.lb8
-rw-r--r--src/cpu/x86/lapic/apic_timer.c67
-rw-r--r--src/cpu/x86/lapic/lapic_cpu_init.c2
-rw-r--r--src/cpu/x86/tsc/delay_tsc.c4
4 files changed, 78 insertions, 3 deletions
diff --git a/src/cpu/x86/lapic/Config.lb b/src/cpu/x86/lapic/Config.lb
index 8b5eaa376e..b0636f3abd 100644
--- a/src/cpu/x86/lapic/Config.lb
+++ b/src/cpu/x86/lapic/Config.lb
@@ -1,3 +1,11 @@
+uses CONFIG_UDELAY_LAPIC
+
object lapic.o
object lapic_cpu_init.o
object secondary.S
+
+if CONFIG_UDELAY_LAPIC
+ default HAVE_INIT_TIMER=1
+ object apic_timer.o
+end
+
diff --git a/src/cpu/x86/lapic/apic_timer.c b/src/cpu/x86/lapic/apic_timer.c
new file mode 100644
index 0000000000..a4737b3e7c
--- /dev/null
+++ b/src/cpu/x86/lapic/apic_timer.c
@@ -0,0 +1,67 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007 Advanced Micro Devices, Inc.
+ * Copyright (C) 2009 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdint.h>
+#include <delay.h>
+#include <cpu/x86/msr.h>
+#include <cpu/x86/lapic.h>
+
+/* NOTE: This code uses global variables, so it can not be used during
+ * memory init.
+ */
+
+#define FSB_CLOCK_STS 0xcd
+
+static u32 timer_fsb = 200; // default to 200MHz
+
+void init_timer(void)
+{
+ msr_t fsb_clock_sts;
+
+ /* Set the apic timer to no interrupts and periodic mode */
+ lapic_write(LAPIC_LVTT, (1 << 17) | (1<< 16) | (0 << 12) | (0 << 0));
+
+ /* Set the divider to 1, no divider */
+ lapic_write(LAPIC_TDCR, LAPIC_TDR_DIV_1);
+
+ /* Set the initial counter to 0xffffffff */
+ lapic_write(LAPIC_TMICT, 0xffffffff);
+
+ /* Set FSB frequency to a reasonable value */
+ fsb_clock_sts = rdmsr(FSB_CLOCK_STS);
+ switch ((fsb_clock_sts.lo >> 4) & 0x07) {
+ case 0: timer_fsb = 266; break;
+ case 1: timer_fsb = 133; break;
+ case 2: timer_fsb = 200; break;
+ case 3: timer_fsb = 166; break;
+ case 5: timer_fsb = 100; break;
+ }
+}
+
+void udelay(u32 usecs)
+{
+ u32 start, value, ticks;
+ /* Calculate the number of ticks to run, our FSB runs at timer_fsb Mhz */
+ ticks = usecs * timer_fsb;
+ start = lapic_read(LAPIC_TMCCT);
+ do {
+ value = lapic_read(LAPIC_TMCCT);
+ } while((start - value) < ticks);
+}
diff --git a/src/cpu/x86/lapic/lapic_cpu_init.c b/src/cpu/x86/lapic/lapic_cpu_init.c
index 4f910d0caf..6d912e62d4 100644
--- a/src/cpu/x86/lapic/lapic_cpu_init.c
+++ b/src/cpu/x86/lapic/lapic_cpu_init.c
@@ -55,7 +55,7 @@ static void copy_secondary_start_to_1m_below(void)
/* need to save it for RAM resume */
lowmem_backup_size = code_size;
lowmem_backup = malloc(code_size);
- lowmem_backup_ptr = (unsigned char *)start_eip;
+ lowmem_backup_ptr = (char *)start_eip;
if (lowmem_backup == NULL)
die("Out of backup memory\n");
diff --git a/src/cpu/x86/tsc/delay_tsc.c b/src/cpu/x86/tsc/delay_tsc.c
index 946d2cf512..72b1f7196c 100644
--- a/src/cpu/x86/tsc/delay_tsc.c
+++ b/src/cpu/x86/tsc/delay_tsc.c
@@ -106,10 +106,10 @@ static unsigned long long calibrate_tsc(void)
printk_spew("Calibrating delay loop...\n");
start = rdtscll();
- // no udivdi3, dammit.
+ // no udivdi3 because we don't like libgcc. (only in x86emu)
// so we count to 1<< 20 and then right shift 20
for(count = 0; count < (1<<20); count ++)
- outb(0x80, 0x80);
+ inb(0x80);
end = rdtscll();
#if 0