mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 07:17:45 -04:00
some uncommitted old mapper code
apparently from 2011
This commit is contained in:
notaz
parent
cff531af94
commit
30f0fdd422
6 changed files with 209 additions and 15 deletions
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@ -1,6 +1,6 @@
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/*
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* Support for a few cart mappers and some protection.
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* (C) notaz, 2008,2009,2010
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* (C) notaz, 2008-2011
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*
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* This work is licensed under the terms of MAME license.
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* See COPYING file in the top-level directory.
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@ -11,7 +11,7 @@
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/* The SSFII mapper */
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unsigned char ssf2_banks[8];
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static unsigned char ssf2_banks[8];
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static carthw_state_chunk carthw_ssf2_state[] =
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{
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@ -261,25 +261,205 @@ void carthw_radica_startup(void)
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carthw_chunks = carthw_Xin1_state;
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}
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/* Pier Solar. Based on my own research */
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static unsigned char pier_regs[8];
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static unsigned char pier_dump_prot;
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static carthw_state_chunk carthw_pier_state[] =
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{
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{ CHUNK_CARTHW, sizeof(pier_regs), pier_regs },
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{ CHUNK_CARTHW + 1, sizeof(pier_dump_prot), &pier_dump_prot },
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{ 0, 0, NULL }
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};
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static void carthw_pier_write8(u32 a, u32 d)
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{
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u32 a8, target, base;
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if ((a & 0xffff00) != 0xa13000) {
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PicoWrite8_io(a, d);
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return;
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}
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a8 = a & 0x0f;
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pier_regs[a8 / 2] = d;
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elprintf(EL_UIO, "pier w8 [%06x] %02x @%06x", a, d & 0xffff, SekPc);
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switch (a8) {
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case 0x01:
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break;
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case 0x03:
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if (!(pier_regs[0] & 2))
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goto unmapped;
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target = 0x280000;
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base = d << 19;
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goto do_map;
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case 0x05:
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if (!(pier_regs[0] & 2))
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goto unmapped;
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target = 0x300000;
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base = d << 19;
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goto do_map;
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case 0x07:
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if (!(pier_regs[0] & 2))
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goto unmapped;
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target = 0x380000;
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base = d << 19;
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goto do_map;
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case 0x09:
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// TODO
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break;
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case 0x0b:
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// eeprom read
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default:
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unmapped:
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//elprintf(EL_UIO, "pier w8 [%06x] %02x @%06x", a, d & 0xffff, SekPc);
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elprintf(EL_STATUS, "-- unmapped w8 [%06x] %02x @%06x", a, d & 0xffff, SekPc);
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break;
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}
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return;
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do_map:
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if (base + 0x80000 > Pico.romsize) {
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elprintf(EL_ANOMALY|EL_STATUS, "pier: missing bank @ %06x", base);
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return;
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}
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cpu68k_map_set(m68k_read8_map, target, target + 0x80000 - 1, Pico.rom + base, 0);
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cpu68k_map_set(m68k_read16_map, target, target + 0x80000 - 1, Pico.rom + base, 0);
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}
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static void carthw_pier_write16(u32 a, u32 d)
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{
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if ((a & 0xffff00) != 0xa13000) {
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PicoWrite16_io(a, d);
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return;
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}
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elprintf(EL_UIO, "pier w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc);
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carthw_pier_write8(a + 1, d);
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}
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static u32 carthw_pier_read8(u32 a)
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{
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if ((a & 0xffff00) != 0xa13000)
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return PicoRead8_io(a);
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if (a == 0xa1300b)
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return 0; // TODO
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elprintf(EL_UIO, "pier r8 [%06x] @%06x", a, SekPc);
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return 0;
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}
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static void carthw_pier_statef(void);
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static u32 carthw_pier_prot_read8(u32 a)
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{
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/* it takes more than just these reads here to disable ROM protection,
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* but for game emulation purposes this is enough. */
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if (pier_dump_prot > 0)
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pier_dump_prot--;
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if (pier_dump_prot == 0) {
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carthw_pier_statef();
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elprintf(EL_STATUS, "prot off on r8 @%06x", SekPc);
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}
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elprintf(EL_UIO, "pier r8 [%06x] @%06x", a, SekPc);
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return Pico.rom[(a & 0x7fff) ^ 1];
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}
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static void carthw_pier_mem_setup(void)
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{
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cpu68k_map_set(m68k_write8_map, 0xa10000, 0xa1ffff, carthw_pier_write8, 1);
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cpu68k_map_set(m68k_write16_map, 0xa10000, 0xa1ffff, carthw_pier_write16, 1);
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cpu68k_map_set(m68k_read8_map, 0xa10000, 0xa1ffff, carthw_pier_read8, 1);
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}
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static void carthw_pier_prot_mem_setup(int prot_enable)
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{
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if (prot_enable) {
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/* the dump protection.. */
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int a;
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for (a = 0x000000; a < 0x400000; a += M68K_BANK_SIZE) {
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cpu68k_map_set(m68k_read8_map, a, a + 0xffff, Pico.rom + Pico.romsize, 0);
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cpu68k_map_set(m68k_read16_map, a, a + 0xffff, Pico.rom + Pico.romsize, 0);
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}
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cpu68k_map_set(m68k_read8_map, M68K_BANK_SIZE, M68K_BANK_SIZE * 2 - 1,
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carthw_pier_prot_read8, 1);
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}
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else {
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cpu68k_map_set(m68k_read8_map, 0, 0x27ffff, Pico.rom, 0);
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cpu68k_map_set(m68k_read16_map, 0, 0x27ffff, Pico.rom, 0);
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}
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}
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static void carthw_pier_statef(void)
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{
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carthw_pier_prot_mem_setup(pier_dump_prot);
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if (!pier_dump_prot) {
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/* setup all banks */
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u32 r0 = pier_regs[0];
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carthw_pier_write8(0xa13001, 3);
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carthw_pier_write8(0xa13003, pier_regs[1]);
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carthw_pier_write8(0xa13005, pier_regs[2]);
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carthw_pier_write8(0xa13007, pier_regs[3]);
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carthw_pier_write8(0xa13001, r0);
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}
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}
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static void carthw_pier_reset(void)
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{
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pier_regs[0] = 1;
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pier_regs[1] = pier_regs[2] = pier_regs[3] = 0;
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pier_dump_prot = 3;
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carthw_pier_statef();
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}
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void carthw_pier_startup(void)
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{
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int i;
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elprintf(EL_STATUS, "Pier Solar mapper startup");
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// mostly same as for realtec..
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i = PicoCartResize(Pico.romsize + M68K_BANK_SIZE);
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if (i != 0) {
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elprintf(EL_STATUS, "OOM");
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return;
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}
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// create dump protection bank
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for (i = 0; i < M68K_BANK_SIZE; i += 0x8000)
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memcpy(Pico.rom + Pico.romsize + i, Pico.rom, 0x8000);
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PicoCartMemSetup = carthw_pier_mem_setup;
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PicoResetHook = carthw_pier_reset;
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PicoLoadStateHook = carthw_pier_statef;
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carthw_chunks = carthw_pier_state;
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}
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/* Simple unlicensed ROM protection emulation */
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static struct {
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u32 addr;
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u32 mask;
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u16 val;
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u16 readonly;
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u32 addr;
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u32 mask;
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u16 val;
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u16 readonly;
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} *sprot_items;
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static int sprot_item_alloc;
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static int sprot_item_count;
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static u16 *carthw_sprot_get_val(u32 a, int rw_only)
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{
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int i;
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int i;
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for (i = 0; i < sprot_item_count; i++)
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if ((a & sprot_items[i].mask) == sprot_items[i].addr)
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if (!rw_only || !sprot_items[i].readonly)
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return &sprot_items[i].val;
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return NULL;
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for (i = 0; i < sprot_item_count; i++)
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if ((a & sprot_items[i].mask) == sprot_items[i].addr)
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if (!rw_only || !sprot_items[i].readonly)
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return &sprot_items[i].val;
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return NULL;
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}
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static u32 PicoRead8_sprot(u32 a)
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@ -19,6 +19,7 @@ void carthw_ssf2_startup(void);
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void carthw_Xin1_startup(void);
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void carthw_realtec_startup(void);
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void carthw_radica_startup(void);
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void carthw_pier_startup(void);
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void carthw_sprot_startup(void);
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void carthw_sprot_new_location(unsigned int a,
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