MIPS: Add HARDWARE_WATCHPOINTS definitions and support code.

This is the main support code for the patch.  Here we just add the
code, the following patches hook it up.

Signed-off-by: David Daney <ddaney@avtrex.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

 create mode 100644 arch/mips/include/asm/watch.h
 create mode 100644 arch/mips/kernel/watch.c

1 files changed, 32 insertions, 0 deletions

diff --git a/arch/mips/include/asm/watch.h b/arch/mips/include/asm/watch.h
new file mode 100644
index 000000000000..20126ec79359
--- /dev/null
+++ b/arch/mips/include/asm/watch.h
@@ -0,0 +1,32 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2008 David Daney
+ */
+#ifndef _ASM_WATCH_H
+#define _ASM_WATCH_H
+
+#include <linux/bitops.h>
+
+#include <asm/mipsregs.h>
+
+void mips_install_watch_registers(void);
+void mips_read_watch_registers(void);
+void mips_clear_watch_registers(void);
+void mips_probe_watch_registers(struct cpuinfo_mips *c);
+
+#ifdef CONFIG_HARDWARE_WATCHPOINTS
+#define __restore_watch() do {                                          \
+        if (unlikely(test_bit(TIF_LOAD_WATCH,                           \
+                              &current_thread_info()->flags))) {        \
+                mips_install_watch_registers();                         \
+        }                                                               \
+} while (0)
+
+#else
+#define __restore_watch() do {} while (0)
+#endif
+
+#endif /* _ASM_WATCH_H */