/*
- * 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.
#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
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;
+}
+
notaz.gp2x.de / picodrive.git / blobdiff