1 files changed, 153 insertions, 0 deletions

diff --git a/include/asm-xtensa/asmmacro.h b/include/asm-xtensa/asmmacro.h
new file mode 100644
index 000000000000..76915cabad17
--- /dev/null
+++ b/include/asm-xtensa/asmmacro.h
@@ -0,0 +1,153 @@
+/*
+ * include/asm-xtensa/asmmacro.h
+ *
+ * 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) 2005 Tensilica Inc.
+ */
+
+#ifndef _XTENSA_ASMMACRO_H
+#define _XTENSA_ASMMACRO_H
+
+#include <asm/variant/core.h>
+
+/*
+ * Some little helpers for loops. Use zero-overhead-loops
+ * where applicable and if supported by the processor.
+ *
+ * __loopi ar, at, size, inc
+ *         ar   register initialized with the start address
+ *         at   scratch register used by macro
+ *         size size immediate value
+ *         inc  increment
+ *
+ * __loops ar, as, at, inc_log2[, mask_log2][, cond][, ncond]
+ *         ar   register initialized with the start address
+ *         as   register initialized with the size
+ *         at   scratch register use by macro
+ *         inc_log2     increment [in log2]
+ *         mask_log2    mask [in log2]
+ *         cond         true condition (used in loop'cond')
+ *         ncond        false condition (used in b'ncond')
+ *
+ * __loop  as
+ *         restart loop. 'as' register must not have been modified!
+ *
+ * __endla ar, at, incr
+ *         ar   start address (modified)
+ *         as   scratch register used by macro
+ *         inc  increment
+ */
+
+/*
+ * loop for given size as immediate
+ */
+
+        .macro  __loopi ar, at, size, incr
+
+#if XCHAL_HAVE_LOOPS
+                movi    \at, ((\size + \incr - 1) / (\incr))
+                loop    \at, 99f
+#else
+                addi    \at, \ar, \size
+                98:
+#endif
+
+        .endm
+
+/*
+ * loop for given size in register
+ */
+
+        .macro  __loops ar, as, at, incr_log2, mask_log2, cond, ncond
+
+#if XCHAL_HAVE_LOOPS
+                .ifgt \incr_log2 - 1
+                        addi    \at, \as, (1 << \incr_log2) - 1
+                        .ifnc \mask_log2,
+                                extui   \at, \at, \incr_log2, \mask_log2
+                        .else
+                                srli    \at, \at, \incr_log2
+                        .endif
+                .endif
+                loop\cond       \at, 99f
+#else
+                .ifnc \mask_log2,
+                        extui   \at, \as, \incr_log2, \mask_log2
+                .else
+                        .ifnc \ncond,
+                                srli    \at, \as, \incr_log2
+                        .endif
+                .endif
+                .ifnc \ncond,
+                        b\ncond \at, 99f
+
+                .endif
+                .ifnc \mask_log2,
+                        slli    \at, \at, \incr_log2
+                        add     \at, \ar, \at
+                .else
+                        add     \at, \ar, \as
+                .endif
+#endif
+                98:
+
+        .endm
+
+/*
+ * loop from ar to ax
+ */
+
+        .macro  __loopt ar, as, at, incr_log2
+
+#if XCHAL_HAVE_LOOPS
+                sub     \at, \as, \ar
+                .ifgt   \incr_log2 - 1
+                        addi    \at, \at, (1 << \incr_log2) - 1
+                        srli    \at, \at, \incr_log2
+                .endif
+                loop    \at, 99f
+#else
+                98:
+#endif
+
+        .endm
+
+/*
+ * restart loop. registers must be unchanged
+ */
+
+        .macro  __loop  as
+
+#if XCHAL_HAVE_LOOPS
+                loop    \as, 99f
+#else
+                98:
+#endif
+
+        .endm
+
+/*
+ * end of loop with no increment of the address.
+ */
+
+        .macro  __endl  ar, as
+#if !XCHAL_HAVE_LOOPS
+                bltu    \ar, \as, 98b
+#endif
+                99:
+        .endm
+
+/*
+ * end of loop with increment of the address.
+ */
+
+        .macro  __endla ar, as, incr
+                addi    \ar, \ar, \incr
+                __endl  \ar \as
+        .endm
+
+
+#endif /* _XTENSA_ASMMACRO_H */