[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH] Fix Linux task preemption on Versatile board
From: |
Daniel Jacobowitz |
Subject: |
[Qemu-devel] [PATCH] Fix Linux task preemption on Versatile board |
Date: |
Sun, 13 Sep 2009 09:54:41 -0400 |
User-agent: |
Mutt/1.5.20 (2009-06-14) |
Recent versions of the Linux kernel will not preempt CPU-intensive
tasks unless the clock used by sched_clock() works. On -M versatilepb
that's the 24MHz timer in the system controller. It's a very simple
timer, so implement it.
Signed-off-by: Daniel Jacobowitz <address@hidden>
---
hw/arm_sysctl.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/hw/arm_sysctl.c b/hw/arm_sysctl.c
index 686c1cc..26300ef 100644
--- a/hw/arm_sysctl.c
+++ b/hw/arm_sysctl.c
@@ -7,6 +7,8 @@
* This code is licenced under the GPL.
*/
+#include "hw.h"
+#include "qemu-timer.h"
#include "sysbus.h"
#include "primecell.h"
#include "sysemu.h"
@@ -71,8 +73,7 @@ static uint32_t arm_sysctl_read(void *opaque,
target_phys_addr_t offset)
case 0x58: /* BOOTCS */
return 0;
case 0x5c: /* 24MHz */
- /* ??? not implemented. */
- return 0;
+ return muldiv64(qemu_get_clock(vm_clock), 24000000,
get_ticks_per_sec());
case 0x60: /* MISC */
return 0;
case 0x84: /* PROCID0 */
--
Daniel Jacobowitz
CodeSourcery
- [Qemu-devel] [PATCH] Fix Linux task preemption on Versatile board,
Daniel Jacobowitz <=