1 files changed, 49 insertions, 0 deletions

diff --git a/arch/i386/lib/delay.c b/arch/i386/lib/delay.c
new file mode 100644
index 000000000000..080639f262b1
--- /dev/null
+++ b/arch/i386/lib/delay.c
@@ -0,0 +1,49 @@
+/*
+ *      Precise Delay Loops for i386
+ *
+ *      Copyright (C) 1993 Linus Torvalds
+ *      Copyright (C) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
+ *
+ *      The __delay function must _NOT_ be inlined as its execution time
+ *      depends wildly on alignment on many x86 processors. The additional
+ *      jump magic is needed to get the timing stable on all the CPU's
+ *      we have to worry about.
+ */
+
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <asm/processor.h>
+#include <asm/delay.h>
+#include <asm/timer.h>
+
+#ifdef CONFIG_SMP
+#include <asm/smp.h>
+#endif
+
+extern struct timer_opts* timer;
+
+void __delay(unsigned long loops)
+{
+        cur_timer->delay(loops);
+}
+
+inline void __const_udelay(unsigned long xloops)
+{
+        int d0;
+        xloops *= 4;
+        __asm__("mull %0"
+                :"=d" (xloops), "=&a" (d0)
+                :"1" (xloops),"0" (cpu_data[_smp_processor_id()].loops_per_jiffy * (HZ/4)));
+        __delay(++xloops);
+}
+
+void __udelay(unsigned long usecs)
+{
+        __const_udelay(usecs * 0x000010c7);  /* 2**32 / 1000000 (rounded up) */
+}
+
+void __ndelay(unsigned long nsecs)
+{
+        __const_udelay(nsecs * 0x00005);  /* 2**32 / 1000000000 (rounded up) */
+}