patch-2.3.43 linux/include/asm-ia64/delay.h

• Lines: 91
• Date: Sun Feb 6 18:42:40 2000
• Orig file: v2.3.42/linux/include/asm-ia64/delay.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.42/linux/include/asm-ia64/delay.h linux/include/asm-ia64/delay.h
@@ -0,0 +1,90 @@
+#ifndef _ASM_IA64_DELAY_H
+#define _ASM_IA64_DELAY_H
+
+/*
+ * Delay routines using a pre-computed "cycles/usec" value.
+ *
+ * Copyright (C) 1998, 1999 Hewlett-Packard Co
+ * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 1999 VA Linux Systems
+ * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
+ * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
+ * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+
+#include <asm/processor.h>
+
+extern __inline__ void
+ia64_set_itm (unsigned long val)
+{
+	__asm__ __volatile__("mov cr.itm=%0;; srlz.d;;" :: "r"(val) : "memory");
+}
+
+extern __inline__ unsigned long
+ia64_get_itm (void)
+{
+	unsigned long result;
+
+	__asm__ __volatile__("mov %0=cr.itm;; srlz.d;;" : "=r"(result) :: "memory");
+	return result;
+}
+
+extern __inline__ void
+ia64_set_itv (unsigned char vector, unsigned char masked)
+{
+	if (masked > 1)
+		masked = 1;
+
+	__asm__ __volatile__("mov cr.itv=%0;; srlz.d;;"
+			     :: "r"((masked << 16) | vector) : "memory");
+}
+
+extern __inline__ void
+ia64_set_itc (unsigned long val)
+{
+	__asm__ __volatile__("mov ar.itc=%0;; srlz.d;;" :: "r"(val) : "memory");
+}
+
+extern __inline__ unsigned long
+ia64_get_itc (void)
+{
+	unsigned long result;
+
+	__asm__ __volatile__("mov %0=ar.itc" : "=r"(result) :: "memory");
+	return result;
+}
+
+extern __inline__ void
+__delay (unsigned long loops)
+{
+        unsigned long saved_ar_lc;
+
+	if (loops < 1)
+		return;
+
+	__asm__ __volatile__("mov %0=ar.lc;;" : "=r"(saved_ar_lc));
+	__asm__ __volatile__("mov ar.lc=%0;;" :: "r"(loops - 1));
+        __asm__ __volatile__("1:\tbr.cloop.sptk.few 1b;;");
+	__asm__ __volatile__("mov ar.lc=%0" :: "r"(saved_ar_lc));
+}
+
+extern __inline__ void
+udelay (unsigned long usecs)
+{
+#ifdef CONFIG_IA64_SOFTSDV_HACKS
+	while (usecs--)
+		;
+#else
+	unsigned long start = ia64_get_itc();
+	unsigned long cycles = usecs*my_cpu_data.cyc_per_usec;
+
+	while (ia64_get_itc() - start < cycles)
+		/* skip */;
+#endif	/* CONFIG_IA64_SOFTSDV_HACKS */
+}
+
+#endif /* _ASM_IA64_DELAY_H */