start new makefile, migrate to libpicofe

[picodrive.git] / cpu / Cyclone / config.h

diff --git a/cpu/Cyclone/config.h b/cpu/Cyclone/config.h
index 6ec08f8..d73b5b5 100644 (file)
--- a/cpu/Cyclone/config.h
+++ b/cpu/Cyclone/config.h
@@ -16,7 +16,6 @@
  * Mega Drive system. As VDP chip in these systems had control of the bus,\r
  * several instructions were acting differently, for example TAS did'n have\r
  * the write-back phase. That will be emulated, if this option is enabled.\r
- * This option also alters timing slightly.\r
  */\r
 #define CYCLONE_FOR_GENESIS         0\r
 \r
@@ -66,6 +65,17 @@
 #define MEMHANDLERS_CHANGE_FLAGS    0\r
 #define MEMHANDLERS_CHANGE_CYCLES   0\r
 \r
+/*\r
+ * If the following macro is defined, Cyclone no longer calls read*, write*,\r
+ * fetch* and checkpc from it's context, it calls these functions directly\r
+ * instead, prefixed with prefix selected below. For example, if\r
+ * MEMHANDLERS_DIRECT_PREFIX is set to cyclone_, it will call cyclone_read8\r
+ * on byte reads.\r
+ * This is to avoid indirect jumps, which are slower. It also saves one ARM\r
+ * instruction.\r
+ */\r
+/* MEMHANDLERS_DIRECT_PREFIX "cyclone_" */\r
+\r
 /*\r
  * If enabled, Cyclone will call .IrqCallback routine from it's context whenever it\r
  * acknowledges an IRQ. IRQ level (.irq) is not cleared automatically, do this in your\r
@@ -133,8 +143,8 @@
 \r
 /*\r
  * When this option is enabled Cyclone will do two word writes instead of one\r
- * long write when handling MOVE.L with pre-decrementing destination, as described in\r
- * Bart Trzynadlowski's doc (http://www.trzy.org/files/68knotes.txt).\r
+ * long write when handling MOVE.L or MOVEM.L with pre-decrementing destination,\r
+ * as described in Bart Trzynadlowski's doc (http://www.trzy.org/files/68knotes.txt).\r
  * Enable this if you are emulating a 16 bit system.\r
  */\r
 #define SPLIT_MOVEL_PD              1\r