X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=pico%2Fcarthw%2Fcarthw.c;fp=pico%2Fcarthw%2Fcarthw.c;h=9d81f8e072b7d49c3a1e7a76357ff9317c905f75;hb=000f53350cb0d6540310d8c4b02eb034c9662f0d;hp=6424f1eb3280c389f5589d15b0562f253fb1a05d;hpb=45f2f245f51ef0c0d37df3c998595c132bfcaffa;p=picodrive.git

diff --git a/pico/carthw/carthw.c b/pico/carthw/carthw.c
index 6424f1e..9d81f8e 100644
--- a/pico/carthw/carthw.c
+++ b/pico/carthw/carthw.c
@@ -1,5 +1,5 @@
 /*
- * Support for a few cart mappers.
+ * Support for a few cart mappers and some protection.
  *
  * (c) Copyright 2008-2009, Grazvydas "notaz" Ignotas
  * Free for non-commercial use.
@@ -10,6 +10,68 @@
 #include "../memory.h"
 
 
+/* The SSFII mapper */
+unsigned char ssf2_banks[8];
+
+static carthw_state_chunk carthw_ssf2_state[] =
+{
+	{ CHUNK_CARTHW, sizeof(ssf2_banks), &ssf2_banks },
+	{ 0,            0,                  NULL }
+};
+
+static void carthw_ssf2_write8(u32 a, u32 d)
+{
+	u32 target, base;
+
+	if ((a & 0xfffff0) != 0xa130f0) {
+		PicoWrite8_io(a, d);
+		return;
+	}
+
+	a &= 0x0e;
+	if (a == 0)
+		return;
+
+	ssf2_banks[a >> 1] = d;
+	base = d << 19;
+	target = a << 18;
+	if (base + 0x80000 > Pico.romsize) {
+		elprintf(EL_ANOMALY|EL_STATUS, "ssf2: missing bank @ %06x", base);
+		return;
+	}
+
+	cpu68k_map_set(m68k_read8_map,  target, target + 0x80000 - 1, Pico.rom + base, 0);
+	cpu68k_map_set(m68k_read16_map, target, target + 0x80000 - 1, Pico.rom + base, 0);
+}
+
+static void carthw_ssf2_mem_setup(void)
+{
+	cpu68k_map_set(m68k_write8_map, 0xa10000, 0xa1ffff, carthw_ssf2_write8, 1);
+}
+
+static void carthw_ssf2_statef(void)
+{
+	int i;
+	for (i = 1; i < 8; i++)
+		carthw_ssf2_write8(0xa130f0 | (i << 1), ssf2_banks[i]);
+}
+
+void carthw_ssf2_startup(void)
+{
+	int i;
+
+	elprintf(EL_STATUS, "SSF2 mapper startup");
+
+	// default map
+	for (i = 0; i < 8; i++)
+		ssf2_banks[i] = i;
+
+	PicoCartMemSetup  = carthw_ssf2_mem_setup;
+	PicoLoadStateHook = carthw_ssf2_statef;
+	carthw_chunks     = carthw_ssf2_state;
+}
+
+
 /* Common *-in-1 pirate mapper.
  * Switches banks based on addr lines when /TIME is set.
  * TODO: verify
@@ -202,3 +264,243 @@ void carthw_radica_startup(void)
 	carthw_chunks     = carthw_Xin1_state;
 }
 
+/* Simple unlicensed ROM protection emulation */
+static struct {
+	u32 addr;
+	u32 mask;
+	u16 val;
+	u16 readonly;
+} *sprot_items;
+static int sprot_item_alloc;
+static int sprot_item_count;
+
+static u16 *carthw_sprot_get_val(u32 a, int rw_only)
+{
+	int i;
+
+	for (i = 0; i < sprot_item_count; i++)
+		if ((a & sprot_items[i].mask) == sprot_items[i].addr)
+			if (!rw_only || !sprot_items[i].readonly)
+				return &sprot_items[i].val;
+	return NULL;
+}
+
+static u32 PicoRead8_sprot(u32 a)
+{
+  u16 *val;
+  u32 d;
+
+  if (0xa10000 <= a && a < 0xa12000)
+    return PicoRead8_io(a);
+
+  val = carthw_sprot_get_val(a, 0);
+  if (val != NULL) {
+    d = *val;
+    if (!(a & 1))
+      d >>= 8;
+    elprintf(EL_UIO, "prot r8  [%06x]   %02x @%06x", a, d, SekPc);
+    return d;
+  }
+  else {
+    elprintf(EL_UIO, "prot r8  [%06x] MISS @%06x", a, SekPc);
+    return 0;
+  }
+}
+
+static u32 PicoRead16_sprot(u32 a)
+{
+  u16 *val;
+
+  if (0xa10000 <= a && a < 0xa12000)
+    return PicoRead16_io(a);
+
+  val = carthw_sprot_get_val(a, 0);
+  if (val != NULL) {
+    elprintf(EL_UIO, "prot r16 [%06x] %04x @%06x", a, *val, SekPc);
+    return *val;
+  }
+  else {
+    elprintf(EL_UIO, "prot r16 [%06x] MISS @%06x", a, SekPc);
+    return 0;
+  }
+}
+
+static void PicoWrite8_sprot(u32 a, u32 d)
+{
+  u16 *val;
+
+  if (0xa10000 <= a && a < 0xa12000) {
+    PicoWrite8_io(a, d);
+    return;
+  }
+
+  val = carthw_sprot_get_val(a, 1);
+  if (val != NULL) {
+    if (a & 1)
+      *val = (*val & 0xff00) | (d | 0xff);
+    else
+      *val = (*val & 0x00ff) | (d << 8);
+    elprintf(EL_UIO, "prot w8  [%06x]   %02x @%06x", a, d & 0xff, SekPc);
+  }
+  else
+    elprintf(EL_UIO, "prot w8  [%06x]   %02x MISS @%06x", a, d & 0xff, SekPc);
+}
+
+static void PicoWrite16_sprot(u32 a, u32 d)
+{
+  u16 *val;
+
+  if (0xa10000 <= a && a < 0xa12000) {
+    PicoWrite16_io(a, d);
+    return;
+  }
+
+  val = carthw_sprot_get_val(a, 1);
+  if (val != NULL) {
+    *val = d;
+    elprintf(EL_UIO, "prot w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc);
+  }
+  else
+    elprintf(EL_UIO, "prot w16 [%06x] %04x MISS @%06x", a, d & 0xffff, SekPc);
+}
+
+void carthw_sprot_new_location(unsigned int a, unsigned int mask, unsigned short val, int is_ro)
+{
+  if (sprot_items == NULL) {
+    sprot_items = calloc(8, sizeof(sprot_items[0]));
+    sprot_item_alloc = 8;
+    sprot_item_count = 0;
+  }
+
+  if (sprot_item_count == sprot_item_alloc) {
+    void *tmp;
+    sprot_item_alloc *= 2;
+    tmp = realloc(sprot_items, sprot_item_alloc);
+    if (tmp == NULL) {
+      elprintf(EL_STATUS, "OOM");
+      return;
+    }
+    sprot_items = tmp;
+  }
+
+  sprot_items[sprot_item_count].addr = a;
+  sprot_items[sprot_item_count].mask = mask;
+  sprot_items[sprot_item_count].val = val;
+  sprot_items[sprot_item_count].readonly = is_ro;
+  sprot_item_count++;
+}
+
+static void carthw_sprot_unload(void)
+{
+  free(sprot_items);
+  sprot_items = NULL;
+  sprot_item_count = sprot_item_alloc = 0;
+}
+
+static void carthw_sprot_mem_setup(void)
+{
+  int start;
+
+  // map ROM - 0x7fffff, /TIME areas (which are tipically used)
+  start = (Pico.romsize + M68K_BANK_MASK) & ~M68K_BANK_MASK;
+  cpu68k_map_set(m68k_read8_map,   start, 0x7fffff, PicoRead8_sprot, 1);
+  cpu68k_map_set(m68k_read16_map,  start, 0x7fffff, PicoRead16_sprot, 1);
+  cpu68k_map_set(m68k_write8_map,  start, 0x7fffff, PicoWrite8_sprot, 1);
+  cpu68k_map_set(m68k_write16_map, start, 0x7fffff, PicoWrite16_sprot, 1);
+
+  cpu68k_map_set(m68k_read8_map,   0xa10000, 0xa1ffff, PicoRead8_sprot, 1);
+  cpu68k_map_set(m68k_read16_map,  0xa10000, 0xa1ffff, PicoRead16_sprot, 1);
+  cpu68k_map_set(m68k_write8_map,  0xa10000, 0xa1ffff, PicoWrite8_sprot, 1);
+  cpu68k_map_set(m68k_write16_map, 0xa10000, 0xa1ffff, PicoWrite16_sprot, 1);
+}
+
+void carthw_sprot_startup(void)
+{
+  elprintf(EL_STATUS, "Prot emu startup");
+
+  PicoCartMemSetup   = carthw_sprot_mem_setup;
+  PicoCartUnloadHook = carthw_sprot_unload;
+}
+
+/* Protection emulation for Lion King 3. Credits go to Haze */
+static u8 prot_lk3_cmd, prot_lk3_data;
+
+static u32 PicoRead8_plk3(u32 a)
+{
+  u32 d = 0;
+  switch (prot_lk3_cmd) {
+    case 1: d = prot_lk3_data >> 1; break;
+    case 2: // nibble rotate
+      d = ((prot_lk3_data >> 4) | (prot_lk3_data << 4)) & 0xff;
+      break;
+    case 3: // bit rotate
+      d = prot_lk3_data;
+      d = (d >> 4) | (d << 4);
+      d = ((d & 0xcc) >> 2) | ((d & 0x33) << 2);
+      d = ((d & 0xaa) >> 1) | ((d & 0x55) << 1);
+      break;
+/* Top Fighter 2000 MK VIII (Unl)
+      case 0x98: d = 0x50; break; // prot_lk3_data == a8 here
+      case 0x67: d = 0xde; break; // prot_lk3_data == 7b here (rot!)
+      case 0xb5: d = 0x9f; break; // prot_lk3_data == 4a
+*/
+    default:
+      elprintf(EL_UIO, "unhandled prot cmd %02x @%06x", prot_lk3_cmd, SekPc);
+      break;
+  }
+
+  elprintf(EL_UIO, "prot r8  [%06x]   %02x @%06x", a, d, SekPc);
+  return d;
+}
+
+static void PicoWrite8_plk3p(u32 a, u32 d)
+{
+  elprintf(EL_UIO, "prot w8  [%06x]   %02x @%06x", a, d & 0xff, SekPc);
+  if (a & 2)
+    prot_lk3_cmd = d;
+  else
+    prot_lk3_data = d;
+}
+
+static void PicoWrite8_plk3b(u32 a, u32 d)
+{
+  int addr;
+
+  elprintf(EL_UIO, "prot w8  [%06x]   %02x @%06x", a, d & 0xff, SekPc);
+  addr = d << 15;
+  if (addr + 0x8000 > Pico.romsize) {
+    elprintf(EL_UIO|EL_ANOMALY, "prot_lk3: bank too large: %02x", d);
+    return;
+  }
+  if (addr == 0)
+    memcpy(Pico.rom, Pico.rom + Pico.romsize, 0x8000);
+  else
+    memcpy(Pico.rom, Pico.rom + addr, 0x8000);
+}
+
+static void carthw_prot_lk3_mem_setup(void)
+{
+  cpu68k_map_set(m68k_read8_map,   0x600000, 0x7fffff, PicoRead8_plk3, 1);
+  cpu68k_map_set(m68k_write8_map,  0x600000, 0x6fffff, PicoWrite8_plk3p, 1);
+  cpu68k_map_set(m68k_write8_map,  0x700000, 0x7fffff, PicoWrite8_plk3b, 1);
+}
+
+void carthw_prot_lk3_startup(void)
+{
+  void *tmp;
+
+  elprintf(EL_STATUS, "lk3 prot emu startup");
+
+  // allocate space for bank0 backup
+  tmp = realloc(Pico.rom, Pico.romsize + 0x8000);
+  if (tmp == NULL)
+  {
+    elprintf(EL_STATUS, "OOM");
+    return;
+  }
+  Pico.rom = tmp;
+  memcpy(Pico.rom + Pico.romsize, Pico.rom, 0x8000);
+
+  PicoCartMemSetup = carthw_prot_lk3_mem_setup;
+}
+