3 files changed, 71 insertions, 13 deletions

diff --git a/apps/codecs/demac/libdemac.make b/apps/codecs/demac/libdemac.make
index 5026fb1d95..dcbd35c6b1 100644
--- a/apps/codecs/demac/libdemac.make
+++ b/apps/codecs/demac/libdemac.make
@@ -12,6 +12,15 @@ DEMACLIB := $(CODECDIR)/libdemac.a
 DEMACLIB_SRC := $(call preprocess, $(APPSDIR)/codecs/demac/libdemac/SOURCES)
 DEMACLIB_OBJ := $(call c2obj, $(DEMACLIB_SRC))
 OTHER_SRC += $(DEMACLIB_SRC)
+ifeq ($(CPU),arm)
+OTHER_SRC += $(APPSDIR)/codecs/demac/libdemac/udiv32_arm-pre.S
+endif
+DEMACLIB_PRE := $(subst .a,-pre.a,$(DEMACLIB))
+DEMACLIB_OBJ_PRE := $(subst udiv32_arm.o,udiv32_arm-pre.o,$(DEMACLIB_OBJ))
+
+$(DEMACLIB_PRE): $(DEMACLIB_OBJ_PRE)
+        $(SILENT)$(shell rm -f $@)
+        $(call PRINTS,AR $(@F))$(AR) rcs $@ $^ >/dev/null
 
 $(DEMACLIB): $(DEMACLIB_OBJ)
         $(SILENT)$(shell rm -f $@)
@@ -20,6 +29,14 @@ $(DEMACLIB): $(DEMACLIB_OBJ)
 DEMACFLAGS = $(filter-out -O%,$(CODECFLAGS))
 DEMACFLAGS += -O3
 
+$(CODECDIR)/ape_free_iram.h: $(CODECDIR)/ape-pre.map
+        $(call PRINTS,GEN $(@F))perl -an \
+                -e 'if(/^PLUGIN_IRAM/){$$istart=hex($$F[1]);$$ilen=hex($$F[2])}' \
+                -e 'if(/iend = /){$$iend=hex($$F[0]);}' \
+                -e '}{if($$ilen){print"#define FREE_IRAM ".($$ilen+$$istart-$$iend)."\n";}' \
+                $(CODECDIR)/ape-pre.map \
+                > $@
+
 $(CODECDIR)/demac/%.o: $(ROOTDIR)/apps/codecs/demac/%.c
         $(SILENT)mkdir -p $(dir $@)
         $(call PRINTS,CC $(subst $(ROOTDIR)/,,$<))$(CC) $(DEMACFLAGS) -c $< -o $@
diff --git a/apps/codecs/demac/libdemac/udiv32_arm-pre.S b/apps/codecs/demac/libdemac/udiv32_arm-pre.S
new file mode 100644
index 0000000000..882d9b6f50
--- /dev/null
+++ b/apps/codecs/demac/libdemac/udiv32_arm-pre.S
@@ -0,0 +1,25 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2010 by Andrew Mahone
+ *
+ * Wrapper for udiv32_arm.S to test available IRAM by pre-linking the codec.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#define APE_PRE
+#include "udiv32_arm.S"
\ No newline at end of file
diff --git a/apps/codecs/demac/libdemac/udiv32_arm.S b/apps/codecs/demac/libdemac/udiv32_arm.S
index 4492492d30..939fce17d4 100644
--- a/apps/codecs/demac/libdemac/udiv32_arm.S
+++ b/apps/codecs/demac/libdemac/udiv32_arm.S
@@ -29,6 +29,13 @@
  ****************************************************************************/
 
 #include "config.h"
+/* On targets with codec iram, a header file will be generated after an initial
+   link of the APE codec, stating the amount of IRAM remaining for use by the
+   reciprocal lookup table. */
+#if !defined(APE_PRE) && defined(USE_IRAM) && ARM_ARCH < 5
+#include "apps/codecs/ape_free_iram.h"
+#endif
+
 /* Codecs should not normally do this, but we need to check a macro, and
  * codecs.h would confuse the assembler. */
 
@@ -88,20 +95,29 @@
     eor     \quotient, \result, \remainder, lsl \bits
 .endm
 
-#ifdef CPU_PP
-#if CONFIG_CPU == PP5020
-.set recip_max, 8384
-#elif CONFIG_CPU == PP5002
-.set recip_max, 4608
+#ifndef FREE_IRAM
+.set recip_max, 2
 #else
-.set recip_max, 16384
-#endif
-#elif CONFIG_CPU == AS3525
-.set recip_max, 42752
-#elif CONFIG_CPU == S5L8701
-.set recip_max, 12800
-#elif CONFIG_CPU == S5L8700
-.set recip_max, 9088
+/* Each table entry is one word. Since a compare is done against the maximum
+   entry as an immediate, the maximum entry must be a valid ARM immediate,
+   which means a byte shifted by an even number of places. */
+.set recip_max, 2 + FREE_IRAM / 4
+.set recip_max_tmp, recip_max >> 8
+.set recip_mask_shift, 0
+.set tmp_shift, 16
+.rept 5
+    .if recip_max_tmp >> tmp_shift
+        .set recip_max_tmp, recip_max_tmp >> tmp_shift
+        .set recip_mask_shift, recip_mask_shift + tmp_shift
+    .endif
+    .set tmp_shift, tmp_shift >> 1
+.endr
+.if recip_max_tmp
+    .set recip_mask_shift, recip_mask_shift + 1
+.endif
+.set recip_mask_shift, (recip_mask_shift + 1) & 62
+.set recip_max, recip_max & (255 << recip_mask_shift)
+//.set recip_max, 2
 #endif
 
 udiv32_arm: