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[1792] 2008-08-07 Christian Franke <address@hidden>
From: |
Christian Franke |
Subject: |
[1792] 2008-08-07 Christian Franke <address@hidden> |
Date: |
Thu, 07 Aug 2008 19:43:36 +0000 |
Revision: 1792
http://svn.sv.gnu.org/viewvc/?view=rev&root=grub&revision=1792
Author: chrfranke
Date: 2008-08-07 19:43:36 +0000 (Thu, 07 Aug 2008)
Log Message:
-----------
2008-08-07 Christian Franke <address@hidden>
* kern/i386/pit.c (TIMER2_SPEAKER): New define.
(TIMER2_GATE): Likewise.
(grub_pit_wait): Add enable/disable of the timer2 gate
bit of port 0x61. This fixes a possible infinite loop.
Modified Paths:
--------------
trunk/grub2/ChangeLog
trunk/grub2/kern/i386/pit.c
Modified: trunk/grub2/ChangeLog
===================================================================
--- trunk/grub2/ChangeLog 2008-08-07 19:21:25 UTC (rev 1791)
+++ trunk/grub2/ChangeLog 2008-08-07 19:43:36 UTC (rev 1792)
@@ -1,3 +1,10 @@
+2008-08-07 Christian Franke <address@hidden>
+
+ * kern/i386/pit.c (TIMER2_SPEAKER): New define.
+ (TIMER2_GATE): Likewise.
+ (grub_pit_wait): Add enable/disable of the timer2 gate
+ bit of port 0x61. This fixes a possible infinite loop.
+
2008-08-07 Bean <address@hidden>
* conf/x86_64-efi.rmk (kernel_mod_SOURCES): Add kern/time.c,
Modified: trunk/grub2/kern/i386/pit.c
===================================================================
--- trunk/grub2/kern/i386/pit.c 2008-08-07 19:21:25 UTC (rev 1791)
+++ trunk/grub2/kern/i386/pit.c 2008-08-07 19:43:36 UTC (rev 1792)
@@ -28,13 +28,29 @@
#define TIMER_ENABLE_LSB 0x20
#define TIMER_ENABLE_MSB 0x10
#define TIMER2_LATCH 0x20
+#define TIMER2_SPEAKER 0x02
+#define TIMER2_GATE 0x01
void
grub_pit_wait (grub_uint16_t tics)
{
+ /* Disable timer2 gate and speaker. */
+ grub_outb (grub_inb (TIMER2_REG_LATCH) & ~ (TIMER2_SPEAKER | TIMER2_GATE),
+ TIMER2_REG_LATCH);
+
+ /* Set tics. */
grub_outb (TIMER2_SELECT | TIMER_ENABLE_LSB | TIMER_ENABLE_MSB,
TIMER_REG_COMMAND);
grub_outb (tics & 0xff, TIMER2_REG_CONTROL);
grub_outb (tics >> 8, TIMER2_REG_CONTROL);
+ /* Enable timer2 gate, keep speaker disabled. */
+ grub_outb ((grub_inb (TIMER2_REG_LATCH) & ~ TIMER2_SPEAKER) | TIMER2_GATE,
+ TIMER2_REG_LATCH);
+
+ /* Wait. */
while ((grub_inb (TIMER2_REG_LATCH) & TIMER2_LATCH) == 0x00);
+
+ /* Disable timer2 gate and speaker. */
+ grub_outb (grub_inb (TIMER2_REG_LATCH) & ~ (TIMER2_SPEAKER | TIMER2_GATE),
+ TIMER2_REG_LATCH);
}
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