From: Arbel Moshe <arbel.moshe@xxxxxxxxxx>
Add a delay utility to x86 arch.
The delay is in number of busy-loop iterations running 'pause'.
Signed-off-by: Arbel Moshe <arbel.moshe@xxxxxxxxxx>
Signed-off-by: Liran Alon <liran.alon@xxxxxxxxxx>
Signed-off-by: Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx>
---
lib/x86/delay.c | 8 ++++++++
lib/x86/delay.h | 8 ++++++++
x86/Makefile.common | 1 +
3 files changed, 17 insertions(+)
create mode 100644 lib/x86/delay.c
create mode 100644 lib/x86/delay.h
diff --git a/lib/x86/delay.c b/lib/x86/delay.c
new file mode 100644
index 000000000000..595ad24fec69
--- /dev/null
+++ b/lib/x86/delay.c
@@ -0,0 +1,8 @@
+#include "delay.h"
+
+void delay(u64 count)
+{
+ while (count--)
+ asm volatile("pause");
+}
+
diff --git a/lib/x86/delay.h b/lib/x86/delay.h
new file mode 100644
index 000000000000..a9bf89485509
--- /dev/null
+++ b/lib/x86/delay.h
@@ -0,0 +1,8 @@
+#ifndef __X86_DELAY__
+#define __X86_DELAY__
+
+#include "libcflat.h"
+
+void delay(u64 count);
+
+#endif
diff --git a/x86/Makefile.common b/x86/Makefile.common
index 5f7eac4a26be..57f0bc7d16c3 100644
--- a/x86/Makefile.common
+++ b/x86/Makefile.common
@@ -19,6 +19,7 @@ cflatobjs += lib/x86/desc.o
cflatobjs += lib/x86/isr.o
cflatobjs += lib/x86/acpi.o
cflatobjs += lib/x86/stack.o
+cflatobjs += lib/x86/delay.o
OBJDIRS += lib/x86
--
1.9.1
