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Fix Linux task preemption on Versatile board

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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 <dan@codesourcery.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Daniel Jacobowitz 2009-09-13 09:54:41 -04:00 committed by Aurelien Jarno
parent fad8c772ef
commit 042eb37a04
1 changed files with 3 additions and 2 deletions
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5
hw/arm_sysctl.c
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@ -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 */