32x: add some comments

cpu/sh2/compiler.c

@@ -166,9 +166,9 @@ static const int reg_map_g2h[] = {
    4,  5,  6,  7,
    8, -1, -1, -1,
   -1, -1, -1, -1,
-  -1, -1, -1,  9,
-  -1, -1, -1, 10,
-  -1, -1, -1, -1,
+  -1, -1, -1,  9, // r12 .. sp
+  -1, -1, -1, 10, // SHR_PC,  SHR_PPC, SHR_PR,   SHR_SR,
+  -1, -1, -1, -1, // SHR_GBR, SHR_VBR, SHR_MACH, SHR_MACL,
 };
 
 static temp_reg_t reg_temp[] = {
@@ -2986,7 +2986,7 @@ int sh2_execute(SH2 *sh2c, int cycles)
   sh2c->cycles_timeslice = cycles;
 
   // cycles are kept in SHR_SR unused bits (upper 20)
-  // bit19 contains T saved for delay slot
+  // bit11 contains T saved for delay slot
   // others are usual SH2 flags
   sh2c->sr &= 0x3f3;
   sh2c->sr |= cycles << 12;

pico/32x/memory.c

@@ -1,13 +1,10 @@
 /*
  * PicoDrive
- * (C) notaz, 2009,2010
+ * (C) notaz, 2009,2010,2013
  *
  * This work is licensed under the terms of MAME license.
  * See COPYING file in the top-level directory.
  *
- * SH2 addr lines:
- * iii. .cc. ..xx *   // Internal, Cs, x
- *
  * Register map:
  * a15100 F....... R.....EA  F.....AC N...VHMP 4000 // Fm Ren nrEs Aden Cart heN V H cMd Pwm
  * a15102 ........ ......SM  ?                 4002 // intS intM
@@ -25,6 +22,21 @@
  * a1511e ?                  ?                 401e
  * a15120            (16 bytes comm)           2020
  * a15130                 (PWM)                2030
+ *
+ * SH2 addr lines:
+ * iii. .cc. ..xx *   // Internal, Cs, x
+ *
+ * sh2 map, wait/bus cycles (from docs):
+ *                             r    w
+ * rom      0000000-0003fff    1    -
+ * sys reg  0004000-00040ff    1    1
+ * vdp reg  0004100-00041ff    5    5
+ * vdp pal  0004200-00043ff    5    5
+ * rom      2000000-23fffff     6-15
+ * dram/fb  4000000-401ffff 5-12  1-3
+ * fb ovr   4020000-403ffff
+ * sdram    6000000-603ffff   12    2  (cycles)
+ * d.a.    c0000000-?
  */
 #include "../pico_int.h"
 #include "../memory.h"