famec: split fm68k_emulate

[picodrive.git] / pico / sek.c

diff --git a/pico/sek.c b/pico/sek.c
index f599d9b..c76a3e8 100644 (file)
--- a/pico/sek.c
+++ b/pico/sek.c
@@ -25,15 +25,30 @@ M68K_CONTEXT PicoCpuFM68k;
 #endif\r
 \r
 \r
+static int do_ack(int level)\r
+{\r
+  struct PicoVideo *pv = &Pico.video;\r
+\r
+  elprintf(EL_INTS, "%cack: @ %06x [%u], p=%02x",\r
+    level == 6 ? 'v' : 'h', SekPc, SekCyclesDone(), pv->pending_ints);\r
+  // the VDP doesn't look at the 68k level\r
+  if (pv->pending_ints & pv->reg[1] & 0x20) {\r
+    pv->pending_ints &= ~0x20;\r
+    pv->status &= ~SR_F;\r
+    return (pv->reg[0] & pv->pending_ints & 0x10) >> 2;\r
+  }\r
+  else if (pv->pending_ints & pv->reg[0] & 0x10)\r
+    pv->pending_ints &= ~0x10;\r
+\r
+  return 0;\r
+}\r
+\r
 /* callbacks */\r
 #ifdef EMU_C68K\r
 // interrupt acknowledgment\r
 static int SekIntAck(int level)\r
 {\r
-  // try to emulate VDP's reaction to 68000 int ack\r
-  if     (level == 4) { Pico.video.pending_ints  =  0;    elprintf(EL_INTS, "hack: @ %06x [%u]", SekPc, Pico.t.m68c_cnt); }\r
-  else if(level == 6) { Pico.video.pending_ints &= ~0x20; elprintf(EL_INTS, "vack: @ %06x [%u]", SekPc, Pico.t.m68c_cnt); }\r
-  PicoCpuCM68k.irq = 0;\r
+  PicoCpuCM68k.irq = do_ack(level);\r
   return CYCLONE_INT_ACK_AUTOVECTOR;\r
 }\r
 \r
@@ -71,9 +86,7 @@ static int SekUnrecognizedOpcode()
 #ifdef EMU_M68K\r
 static int SekIntAckM68K(int level)\r
 {\r
-  if     (level == 4) { Pico.video.pending_ints  =  0;    elprintf(EL_INTS, "hack: @ %06x [%u]", SekPc, Pico.t.m68c_cnt); }\r
-  else if(level == 6) { Pico.video.pending_ints &= ~0x20; elprintf(EL_INTS, "vack: @ %06x [%u]", SekPc, Pico.t.m68c_cnt); }\r
-  CPU_INT_LEVEL = 0;\r
+  CPU_INT_LEVEL = do_ack(level) << 8;\r
   return M68K_INT_ACK_AUTOVECTOR;\r
 }\r
 \r
@@ -87,15 +100,7 @@ static int SekTasCallback(void)
 #ifdef EMU_F68K\r
 static void SekIntAckF68K(unsigned level)\r
 {\r
-  if     (level == 4) {\r
-    Pico.video.pending_ints = 0;\r
-    elprintf(EL_INTS, "hack: @ %06x [%u]", SekPc, SekCyclesDone());\r
-  }\r
-  else if(level == 6) {\r
-    Pico.video.pending_ints &= ~0x20;\r
-    elprintf(EL_INTS, "vack: @ %06x [%u]", SekPc, SekCyclesDone());\r
-  }\r
-  PicoCpuFM68k.interrupts[0] = 0;\r
+  PicoCpuFM68k.interrupts[0] = do_ack(level);\r
 }\r
 #endif\r
 \r
@@ -152,10 +157,7 @@ PICO_INTERNAL int SekReset(void)
   REG_USP = 0; // ?\r
 #endif\r
 #ifdef EMU_F68K\r
-  {\r
-    g_m68kcontext = &PicoCpuFM68k;\r
-    fm68k_reset();\r
-  }\r
+  fm68k_reset(&PicoCpuFM68k);\r
 #endif\r
 \r
   return 0;\r
@@ -173,7 +175,7 @@ void SekStepM68k(void)
 #elif defined(EMU_M68K)\r
   Pico.t.m68c_cnt += m68k_execute(1);\r
 #elif defined(EMU_F68K)\r
-  Pico.t.m68c_cnt += fm68k_emulate(1, 0);\r
+  Pico.t.m68c_cnt += fm68k_emulate(&PicoCpuFM68k, 1, 0);\r
 #endif\r
 }\r
 \r
@@ -315,7 +317,7 @@ void SekInitIdleDet(void)
   CycloneInitIdle();\r
 #endif\r
 #ifdef EMU_F68K\r
-  fm68k_emulate(0, 1);\r
+  fm68k_idle_install();\r
 #endif\r
 }\r
 \r
@@ -426,7 +428,7 @@ void SekFinishIdleDet(void)
   CycloneFinishIdle();\r
 #endif\r
 #ifdef EMU_F68K\r
-  fm68k_emulate(0, 2);\r
+  fm68k_idle_remove();\r
 #endif\r
   while (idledet_count > 0)\r
   {\r