1 files changed, 66 insertions, 0 deletions

diff --git a/arch/ia64/include/asm/rse.h b/arch/ia64/include/asm/rse.h
new file mode 100644
index 000000000000..02830a3b0196
--- /dev/null
+++ b/arch/ia64/include/asm/rse.h
@@ -0,0 +1,66 @@
+#ifndef _ASM_IA64_RSE_H
+#define _ASM_IA64_RSE_H
+
+/*
+ * Copyright (C) 1998, 1999 Hewlett-Packard Co
+ * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * Register stack engine related helper functions.  This file may be
+ * used in applications, so be careful about the name-space and give
+ * some consideration to non-GNU C compilers (though __inline__ is
+ * fine).
+ */
+
+static __inline__ unsigned long
+ia64_rse_slot_num (unsigned long *addr)
+{
+        return (((unsigned long) addr) >> 3) & 0x3f;
+}
+
+/*
+ * Return TRUE if ADDR is the address of an RNAT slot.
+ */
+static __inline__ unsigned long
+ia64_rse_is_rnat_slot (unsigned long *addr)
+{
+        return ia64_rse_slot_num(addr) == 0x3f;
+}
+
+/*
+ * Returns the address of the RNAT slot that covers the slot at
+ * address SLOT_ADDR.
+ */
+static __inline__ unsigned long *
+ia64_rse_rnat_addr (unsigned long *slot_addr)
+{
+        return (unsigned long *) ((unsigned long) slot_addr | (0x3f << 3));
+}
+
+/*
+ * Calculate the number of registers in the dirty partition starting at BSPSTORE and
+ * ending at BSP.  This isn't simply (BSP-BSPSTORE)/8 because every 64th slot stores
+ * ar.rnat.
+ */
+static __inline__ unsigned long
+ia64_rse_num_regs (unsigned long *bspstore, unsigned long *bsp)
+{
+        unsigned long slots = (bsp - bspstore);
+
+        return slots - (ia64_rse_slot_num(bspstore) + slots)/0x40;
+}
+
+/*
+ * The inverse of the above: given bspstore and the number of
+ * registers, calculate ar.bsp.
+ */
+static __inline__ unsigned long *
+ia64_rse_skip_regs (unsigned long *addr, long num_regs)
+{
+        long delta = ia64_rse_slot_num(addr) + num_regs;
+
+        if (num_regs < 0)
+                delta -= 0x3e;
+        return addr + num_regs + delta/0x3f;
+}
+
+#endif /* _ASM_IA64_RSE_H */