Fix Linux task preemption on Versatile board
Backport from master:
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>
diff --git a/hw/arm_sysctl.c b/hw/arm_sysctl.c
index 62222a1..06661d8 100644
--- a/hw/arm_sysctl.c
+++ b/hw/arm_sysctl.c
@@ -8,6 +8,7 @@
*/
#include "hw.h"
+#include "qemu-timer.h"
#include "primecell.h"
#include "sysemu.h"
@@ -70,8 +71,7 @@
case 0x58: /* BOOTCS */
return 0;
case 0x5c: /* 24MHz */
- /* ??? not implemented. */
- return 0;
+ return muldiv64(qemu_get_clock(vm_clock), 24000000, ticks_per_sec);
case 0x60: /* MISC */
return 0;
case 0x84: /* PROCID0 */