patch-1.3.93 linux/arch/sparc/kernel/tick14.c

• Lines: 85
• Date: Sun Apr 21 12:30:31 1996
• Orig file: v1.3.92/linux/arch/sparc/kernel/tick14.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.92/linux/arch/sparc/kernel/tick14.c linux/arch/sparc/kernel/tick14.c
@@ -0,0 +1,84 @@
+/* tick14.c
+ * linux/arch/sparc/kernel/tick14.c
+ *
+ * Copyright (C) 1996 David Redman (djhr@tadpole.co.uk)
+ *
+ * This file handles the Sparc specific level14 ticker
+ * This is really useful for profiling OBP uses it for keyboard
+ * aborts and other stuff.
+ *
+ *
+ */
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/timex.h>
+
+#include <asm/oplib.h>
+#include <asm/segment.h>
+#include <asm/timer.h>
+#include <asm/mostek.h>
+#include <asm/system.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+
+extern unsigned long lvl14_save[5];
+static unsigned long *linux_lvl14 = NULL;
+static unsigned long obp_lvl14[4];
+ 
+void install_linux_ticker(void)
+{
+	unsigned long flags;
+
+	if (!linux_lvl14)
+		return;
+	save_flags(flags); cli();
+	linux_lvl14[0] =  lvl14_save[0];
+	linux_lvl14[1] =  lvl14_save[1];
+	linux_lvl14[2] =  lvl14_save[2];
+	linux_lvl14[3] =  lvl14_save[3];
+	restore_flags(flags);
+}
+
+void install_obp_ticker(void)
+{
+	unsigned long flags;
+    
+	if (!linux_lvl14)
+		return;
+	save_flags(flags); cli();
+	linux_lvl14[0] =  obp_lvl14[0];
+	linux_lvl14[1] =  obp_lvl14[1];
+	linux_lvl14[2] =  obp_lvl14[2];
+	linux_lvl14[3] =  obp_lvl14[3]; 
+	restore_flags(flags);
+}
+
+void claim_ticker14(void (*handler)(int, void *, struct pt_regs *),
+		    int irq_nr, unsigned int timeout )
+{
+	/* first we copy the obp handler instructions
+	 */
+	disable_irq(irq_nr);
+	if (!handler)
+		return;
+    
+	linux_lvl14 = (unsigned long *)lvl14_save[4];
+	obp_lvl14[0] = linux_lvl14[0];
+	obp_lvl14[1] = linux_lvl14[1];
+	obp_lvl14[2] = linux_lvl14[2];
+	obp_lvl14[3] = linux_lvl14[3];
+
+	if (!request_irq(irq_nr,
+			 handler,
+			 (SA_INTERRUPT | SA_STATIC_ALLOC),
+			 "counter14",
+			 NULL)) {
+		install_linux_ticker();
+		load_profile_irq(timeout);
+		enable_irq(irq_nr);
+	}
+}