From 8a847c12e6a82869b7ff6f1742f53e0da1ad2db6 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Sun, 11 Aug 2013 23:49:01 +0300
Subject: [PATCH] 32x: some timing hacks..

---
 pico/32x/memory.c | 18 ++++++++++++++++--
 pico/pico_int.h   |  2 ++
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/pico/32x/memory.c b/pico/32x/memory.c
index f9374c47..c6f3a316 100644
--- a/pico/32x/memory.c
+++ b/pico/32x/memory.c
@@ -32,7 +32,7 @@
  * sys reg  0004000-00040ff    1    1
  * vdp reg  0004100-00041ff    5    5
  * vdp pal  0004200-00043ff    5    5
- * rom      2000000-23fffff     6-15
+ * cart     2000000-23fffff     6-15
  * dram/fb  4000000-401ffff 5-12  1-3
  * fb ovr   4020000-403ffff
  * sdram    6000000-603ffff   12    2  (cycles)
@@ -1063,6 +1063,8 @@ static u32 sh2_read8_cs0(u32 a, SH2 *sh2)
 {
   u32 d = 0;
 
+  sh2_burn_cycles(sh2, 1*2);
+
   // 0x3ff00 is veridied
   if ((a & 0x3ff00) == 0x4000) {
     d = p32x_sh2reg_read16(a, sh2);
@@ -1116,6 +1118,8 @@ static u32 sh2_read16_cs0(u32 a, SH2 *sh2)
 {
   u32 d = 0;
 
+  sh2_burn_cycles(sh2, 1*2);
+
   if ((a & 0x3ff00) == 0x4000) {
     d = p32x_sh2reg_read16(a, sh2);
     if (!(EL_LOGMASK & EL_PWM) && (a & 0x30) == 0x30) // hide PWM
@@ -1206,6 +1210,15 @@ static void REGPARM(3) sh2_write8_sdram(u32 a, u32 d, SH2 *sh2)
   Pico32xMem->sdram[a1 ^ 1] = d;
 }
 
+static void REGPARM(3) sh2_write8_sdram_wt(u32 a, u32 d, SH2 *sh2)
+{
+  // xmen sync hack..
+  if (a < 0x26000200)
+    sh2_end_run(sh2, 32);
+
+  sh2_write8_sdram(a, d, sh2);
+}
+
 static void REGPARM(3) sh2_write8_da(u32 a, u32 d, SH2 *sh2)
 {
   u32 a1 = a & 0xfff;
@@ -1609,7 +1622,8 @@ void PicoMemSetup32x(void)
   // CS3 - SDRAM
   sh2_read8_map[0x06/2].addr   = sh2_read8_map[0x26/2].addr   =
   sh2_read16_map[0x06/2].addr  = sh2_read16_map[0x26/2].addr  = MAP_MEMORY(Pico32xMem->sdram);
-  sh2_write8_map[0x06/2]       = sh2_write8_map[0x26/2]       = sh2_write8_sdram;
+  sh2_write8_map[0x06/2]       = sh2_write8_sdram;
+  sh2_write8_map[0x26/2]       = sh2_write8_sdram_wt;
   sh2_write16_map[0x06/2]      = sh2_write16_map[0x26/2]      = sh2_write16_sdram;
   sh2_read8_map[0x06/2].mask   = sh2_read8_map[0x26/2].mask   =
   sh2_read16_map[0x06/2].mask  = sh2_read16_map[0x26/2].mask  = 0x03ffff;
diff --git a/pico/pico_int.h b/pico/pico_int.h
index d6365799..2a793e5e 100644
--- a/pico/pico_int.h
+++ b/pico/pico_int.h
@@ -251,6 +251,7 @@ extern SH2 sh2s[2];
   } \
 } while (0)
 # define sh2_cycles_left(sh2) (sh2)->icount
+# define sh2_burn_cycles(sh2, n) (sh2)->icount -= n
 # define sh2_pc(sh2) (sh2)->ppc
 #else
 # define sh2_end_run(sh2, after_) do { \
@@ -262,6 +263,7 @@ extern SH2 sh2s[2];
   } \
 } while (0)
 # define sh2_cycles_left(sh2) ((signed int)(sh2)->sr >> 12)
+# define sh2_burn_cycles(sh2, n) (sh2)->sr -= ((n) << 12)
 # define sh2_pc(sh2) (sh2)->pc
 #endif
 
-- 
2.39.5