X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=pico%2Fcd%2Fmemory.c;h=4b4c18f807862ca93c709df164755c618ca717b0;hb=a4dfdb6de1d63aed997554c347cd36cc33b134a3;hp=f8ffaeb0de76fbd70a3e1a4570fe713aab4edd38;hpb=ba6e8bfd4b707aab042e47bc3e2a14f70be01075;p=picodrive.git

diff --git a/pico/cd/memory.c b/pico/cd/memory.c
index f8ffaeb..4b4c18f 100644
--- a/pico/cd/memory.c
+++ b/pico/cd/memory.c
@@ -65,39 +65,41 @@ void PicoWriteS68k16_dec_m1b1(u32 a, u32 d);
 void PicoWriteS68k16_dec_m2b1(u32 a, u32 d);
 #endif
 
-static void remap_prg_window(int r3);
-static void remap_word_ram(int r3);
+static void remap_prg_window(u32 r1, u32 r3);
+static void remap_word_ram(u32 r3);
 
 // poller detection
 #define POLL_LIMIT 16
 #define POLL_CYCLES 124
 
-u32 m68k_comm_check(u32 a, u32 d)
+void m68k_comm_check(u32 a)
 {
   pcd_sync_s68k(SekCyclesDone(), 0);
   if (a != Pico_mcd->m.m68k_poll_a) {
     Pico_mcd->m.m68k_poll_a = a;
     Pico_mcd->m.m68k_poll_cnt = 0;
-    return d;
+    return;
   }
   Pico_mcd->m.m68k_poll_cnt++;
-  return d;
 }
 
 #ifndef _ASM_CD_MEMORY_C
 static u32 m68k_reg_read16(u32 a)
 {
-  u32 d=0;
+  u32 d = 0;
   a &= 0x3e;
 
   switch (a) {
     case 0:
-      d = ((Pico_mcd->s68k_regs[0x33]<<13)&0x8000) | Pico_mcd->m.busreq; // here IFL2 is always 0, just like in Gens
+      // here IFL2 is always 0, just like in Gens
+      d = ((Pico_mcd->s68k_regs[0x33] << 13) & 0x8000)
+        | Pico_mcd->m.busreq;
       goto end;
     case 2:
+      m68k_comm_check(a);
       d = (Pico_mcd->s68k_regs[a]<<8) | (Pico_mcd->s68k_regs[a+1]&0xc7);
       elprintf(EL_CDREG3, "m68k_regs r3: %02x @%06x", (u8)d, SekPc);
-      goto end_comm;
+      goto end;
     case 4:
       d = Pico_mcd->s68k_regs[4]<<8;
       goto end;
@@ -121,17 +123,15 @@ static u32 m68k_reg_read16(u32 a)
 
   if (a < 0x30) {
     // comm flag/cmd/status (0xE-0x2F)
+    m68k_comm_check(a);
     d = (Pico_mcd->s68k_regs[a]<<8) | Pico_mcd->s68k_regs[a+1];
-    goto end_comm;
+    goto end;
   }
 
   elprintf(EL_UIO, "m68k_regs FIXME invalid read @ %02x", a);
 
 end:
   return d;
-
-end_comm:
-  return m68k_comm_check(a, d);
 }
 #endif
 
@@ -157,23 +157,26 @@ void m68k_reg_write8(u32 a, u32 d)
       return;
     case 1:
       d &= 3;
-          elprintf(EL_CDREGS, "d m.busreq %u %u", d, Pico_mcd->m.busreq);
-      if (d == Pico_mcd->m.busreq)
+      dold = Pico_mcd->m.busreq;
+      if (!(d & 1))
+        d |= 2; // verified: can't release bus on reset
+      if (dold == d)
         return;
+
       pcd_sync_s68k(SekCyclesDone(), 0);
 
-      if ((Pico_mcd->m.busreq ^ d) & 1) {
+      if ((dold ^ d) & 1)
         elprintf(EL_INTSW, "m68k: s68k reset %i", !(d&1));
-        if (!(d & 1))
-          d |= 2; // verified: reset also gives bus
-        else {
-          elprintf(EL_CDREGS, "m68k: resetting s68k");
-          SekResetS68k();
-        }
+      if (!(d & 1))
+        Pico_mcd->m.state_flags |= PCD_ST_S68K_RST;
+      else if (d == 1 && (Pico_mcd->m.state_flags & PCD_ST_S68K_RST)) {
+        Pico_mcd->m.state_flags &= ~PCD_ST_S68K_RST;
+        elprintf(EL_CDREGS, "m68k: resetting s68k");
+        SekResetS68k();
       }
-      if ((Pico_mcd->m.busreq ^ d) & 2) {
+      if ((dold ^ d) & 2) {
         elprintf(EL_INTSW, "m68k: s68k brq %i", d >> 1);
-        remap_prg_window(Pico_mcd->s68k_regs[3]);
+        remap_prg_window(d, Pico_mcd->s68k_regs[3]);
       }
       Pico_mcd->m.busreq = d;
       return;
@@ -187,7 +190,7 @@ void m68k_reg_write8(u32 a, u32 d)
       if ((d ^ dold) & 0xc0) {
         elprintf(EL_CDREGS, "m68k: prg bank: %i -> %i",
           (Pico_mcd->s68k_regs[a]>>6), ((d>>6)&3));
-        remap_prg_window(d);
+        remap_prg_window(Pico_mcd->m.busreq, d);
       }
 
       // 2M mode state is tracked regardless of current mode
@@ -212,7 +215,6 @@ void m68k_reg_write8(u32 a, u32 d)
         ((u16 *)Pico_mcd->bios)[0x70/2], ((u16 *)Pico_mcd->bios)[0x72/2]);
       return;
     case 0x0f:
-      d = (d << 1) | ((d >> 7) & 1); // rol8 1 (special case)
       a = 0x0e;
     case 0x0e:
       goto write_comm;
@@ -255,7 +257,7 @@ u32 s68k_poll_detect(u32 a, u32 d)
       //printf("-- diff: %u, cnt = %i\n", clkdiff, cnt);
       if (Pico_mcd->m.s68k_poll_cnt > POLL_LIMIT) {
         SekSetStopS68k(1);
-        elprintf(EL_CDPOLL, "s68k poll detected @ %06x, a=%02x",
+        elprintf(EL_CDPOLL, "s68k poll detected @%06x, a=%02x",
           SekPcS68k, a);
       }
     }
@@ -394,8 +396,6 @@ void s68k_reg_write8(u32 a, u32 d)
       Pico_mcd->m.stopwatch_base_c = SekCyclesDoneS68k();
       return;
     case 0x0e:
-      d &= 0xff;
-      d = (d>>1) | (d<<7); // ror8 1, Gens note: Dragons lair
       a = 0x0f;
     case 0x0f:
       goto write_comm;
@@ -646,17 +646,17 @@ static void s68k_unmapped_write16(u32 a, u32 d)
   elprintf(EL_UIO, "s68k unmapped w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc);
 }
 
-// PRG RAM protected range (000000 - 00ff00)?
+// PRG RAM protected range (000000 - 01fdff)?
 // XXX verify: ff00 or 1fe00 max?
 static void PicoWriteS68k8_prgwp(u32 a, u32 d)
 {
-  if (a >= (Pico_mcd->s68k_regs[2] << 8))
+  if (a >= (Pico_mcd->s68k_regs[2] << 9))
     Pico_mcd->prg_ram[a ^ 1] = d;
 }
 
 static void PicoWriteS68k16_prgwp(u32 a, u32 d)
 {
-  if (a >= (Pico_mcd->s68k_regs[2] << 8))
+  if (a >= (Pico_mcd->s68k_regs[2] << 9))
     *(u16 *)(Pico_mcd->prg_ram + a) = d;
 }
 
@@ -818,7 +818,7 @@ static u32 PicoReadS68k8_pr(u32 a)
 
 regs_done:
     d &= 0xff;
-    elprintf(EL_CDREGS, "s68k_regs r8: [%02x] %02x @ %06x",
+    elprintf(EL_CDREGS, "s68k_regs r8: [%02x] %02x @%06x",
       a, d, SekPcS68k);
     return d;
   }
@@ -852,7 +852,7 @@ static u32 PicoReadS68k16_pr(u32 a)
          d = gfx_cd_read(a);
     else d = s68k_reg_read16(a);
 
-    elprintf(EL_CDREGS, "s68k_regs r16: [%02x] %04x @ %06x",
+    elprintf(EL_CDREGS, "s68k_regs r16: [%02x] %04x @%06x",
       a, d, SekPcS68k);
     return d;
   }
@@ -880,7 +880,7 @@ static void PicoWriteS68k8_pr(u32 a, u32 d)
   // regs
   if ((a & 0xfe00) == 0x8000) {
     a &= 0x1ff;
-    elprintf(EL_CDREGS, "s68k_regs w8: [%02x] %02x @ %06x", a, d, SekPcS68k);
+    elprintf(EL_CDREGS, "s68k_regs w8: [%02x] %02x @%06x", a, d, SekPcS68k);
     if (0x58 <= a && a < 0x68)
          gfx_cd_write16(a&~1, (d<<8)|d);
     else s68k_reg_write8(a,d);
@@ -905,7 +905,7 @@ static void PicoWriteS68k16_pr(u32 a, u32 d)
   // regs
   if ((a & 0xfe00) == 0x8000) {
     a &= 0x1fe;
-    elprintf(EL_CDREGS, "s68k_regs w16: [%02x] %04x @ %06x", a, d, SekPcS68k);
+    elprintf(EL_CDREGS, "s68k_regs w16: [%02x] %04x @%06x", a, d, SekPcS68k);
     if (a >= 0x58 && a < 0x68)
       gfx_cd_write16(a, d);
     else {
@@ -956,11 +956,11 @@ static const void *s68k_dec_write16[2][4] = {
 
 // -----------------------------------------------------------------
 
-static void remap_prg_window(int r3)
+static void remap_prg_window(u32 r1, u32 r3)
 {
   // PRG RAM
-  if (Pico_mcd->m.busreq & 2) {
-    void *bank = Pico_mcd->prg_ram_b[r3 >> 6];
+  if (r1 & 2) {
+    void *bank = Pico_mcd->prg_ram_b[(r3 >> 6) & 3];
     cpu68k_map_all_ram(0x020000, 0x03ffff, bank, 0);
   }
   else {
@@ -968,7 +968,7 @@ static void remap_prg_window(int r3)
   }
 }
 
-static void remap_word_ram(int r3)
+static void remap_word_ram(u32 r3)
 {
   void *bank;
 
@@ -1019,13 +1019,13 @@ static void remap_word_ram(int r3)
 
 void pcd_state_loaded_mem(void)
 {
-  int r3 = Pico_mcd->s68k_regs[3];
+  u32 r3 = Pico_mcd->s68k_regs[3];
 
   /* after load events */
   if (r3 & 4) // 1M mode?
     wram_2M_to_1M(Pico_mcd->word_ram2M);
   remap_word_ram(r3);
-  remap_prg_window(r3);
+  remap_prg_window(Pico_mcd->m.busreq, r3);
   Pico_mcd->m.dmna_ret_2m &= 3;
 
   // restore hint vector
@@ -1067,8 +1067,8 @@ PICO_INTERNAL void PicoMemSetupCD(void)
   cpu68k_map_set(s68k_read16_map,  0x000000, 0x07ffff, Pico_mcd->prg_ram, 0);
   cpu68k_map_set(s68k_write8_map,  0x000000, 0x07ffff, Pico_mcd->prg_ram, 0);
   cpu68k_map_set(s68k_write16_map, 0x000000, 0x07ffff, Pico_mcd->prg_ram, 0);
-  cpu68k_map_set(s68k_write8_map,  0x000000, 0x00ffff, PicoWriteS68k8_prgwp, 1);
-  cpu68k_map_set(s68k_write16_map, 0x000000, 0x00ffff, PicoWriteS68k16_prgwp, 1);
+  cpu68k_map_set(s68k_write8_map,  0x000000, 0x01ffff, PicoWriteS68k8_prgwp, 1);
+  cpu68k_map_set(s68k_write16_map, 0x000000, 0x01ffff, PicoWriteS68k16_prgwp, 1);
 
   // BRAM
   cpu68k_map_set(s68k_read8_map,   0xfe0000, 0xfeffff, PicoReadS68k8_bram, 1);