mirror of https://github.com/hak5/openwrt-owl.git
57 lines
1.6 KiB
Diff
57 lines
1.6 KiB
Diff
|
--- a/arch/mips/kernel/cevt-r4k.c
|
||
|
|
+++ b/arch/mips/kernel/cevt-r4k.c
|
||
|
|
@@ -15,6 +15,22 @@
|
||
|
|
#include <asm/cevt-r4k.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
+ * Compare interrupt can be routed and latched outside the core,
|
||
|
|
+ * so a single execution hazard barrier may not be enough to give
|
||
|
|
+ * it time to clear as seen in the Cause register. 4 time the
|
||
|
|
+ * pipeline depth seems reasonably conservative, and empirically
|
||
|
|
+ * works better in configurations with high CPU/bus clock ratios.
|
||
|
|
+ */
|
||
|
|
+
|
||
|
|
+#define compare_change_hazard() \
|
||
|
|
+ do { \
|
||
|
|
+ irq_disable_hazard(); \
|
||
|
|
+ irq_disable_hazard(); \
|
||
|
|
+ irq_disable_hazard(); \
|
||
|
|
+ irq_disable_hazard(); \
|
||
|
|
+ } while (0)
|
||
|
|
+
|
||
|
|
+/*
|
||
|
|
* The SMTC Kernel for the 34K, 1004K, et. al. replaces several
|
||
|
|
* of these routines with SMTC-specific variants.
|
||
|
|
*/
|
||
|
|
@@ -30,6 +46,7 @@ static int mips_next_event(unsigned long
|
||
|
|
cnt = read_c0_count();
|
||
|
|
cnt += delta;
|
||
|
|
write_c0_compare(cnt);
|
||
|
|
+ compare_change_hazard();
|
||
|
|
res = ((int)(read_c0_count() - cnt) > 0) ? -ETIME : 0;
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
@@ -99,22 +116,6 @@ static int c0_compare_int_pending(void)
|
||
|
|
return (read_c0_cause() >> cp0_compare_irq) & 0x100;
|
||
|
|
}
|
||
|
|
|
||
|
|
-/*
|
||
|
|
- * Compare interrupt can be routed and latched outside the core,
|
||
|
|
- * so a single execution hazard barrier may not be enough to give
|
||
|
|
- * it time to clear as seen in the Cause register. 4 time the
|
||
|
|
- * pipeline depth seems reasonably conservative, and empirically
|
||
|
|
- * works better in configurations with high CPU/bus clock ratios.
|
||
|
|
- */
|
||
|
|
-
|
||
|
|
-#define compare_change_hazard() \
|
||
|
|
- do { \
|
||
|
|
- irq_disable_hazard(); \
|
||
|
|
- irq_disable_hazard(); \
|
||
|
|
- irq_disable_hazard(); \
|
||
|
|
- irq_disable_hazard(); \
|
||
|
|
- } while (0)
|
||
|
|
-
|
||
|
|
int c0_compare_int_usable(void)
|
||
|
|
{
|
||
|
|
unsigned int delta;
|