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r32871 Wednesday 22nd October, 2014 at 13:11:14 UTC by David Haywood
brickzn: do swapped opcode decrypt whan command is written rather than predecrypting specific ranges
[src/mame/drivers]suna8.c
[src/mame/includes]suna8.h

trunk/src/mame/drivers/suna8.c
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8686
8787UINT8 *suna8_state::brickzn_decrypt()
8888{
89   address_space &space = m_maincpu->space(AS_PROGRAM);
9089   UINT8   *RAM    =   memregion("maincpu")->base();
9190   size_t  size    =   memregion("maincpu")->bytes();
9291   UINT8   *decrypt = auto_alloc_array(machine(), UINT8, size);
9392   int i;
9493
95   space.set_decrypted_region(0x0000, 0x7fff, decrypt);
96
9794   /* Opcodes and data */
9895   for (i = 0; i < 0x50000; i++)
9996   {
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133130
134131DRIVER_INIT_MEMBER(suna8_state,brickzn)
135132{
136   UINT8   *RAM    =   memregion("maincpu")->base();
137   UINT8   *decrypt = brickzn_decrypt();
138   int i;
133   m_decrypt = brickzn_decrypt();
139134
140   // Opcodes decrypted as data (to do: activated at run-time)
141   for (i = 0; i < 0x8000; i++)
142   {
143      if (    ((i >= 0x072b) && (i <= 0x076f)) ||
144            ((i >= 0x45c5) && (i <= 0x45e4)) ||
145            ((i >= 0x7393) && (i <= 0x73ba)) ||
146            ((i >= 0x7a79) && (i <= 0x7aa9)) )
147      {
148         decrypt[i] = RAM[i];
149      }
150   }
151
152135   // !!!!!! PATCHES !!!!!!
153136
154137   // To do: ROM banking should be disabled here
155   decrypt[0x11bb] = 0x00; // LD ($C040),A -> NOP
156   decrypt[0x11bc] = 0x00; // LD ($C040),A -> NOP
157   decrypt[0x11bd] = 0x00; // LD ($C040),A -> NOP
138   m_decrypt[0x11bb] = 0x00; // LD ($C040),A -> NOP
139   m_decrypt[0x11bc] = 0x00; // LD ($C040),A -> NOP
140   m_decrypt[0x11bd] = 0x00; // LD ($C040),A -> NOP
158141
159   decrypt[0x3349] = 0xc9; // RET Z -> RET (to avoid: jp $C800)
142   m_decrypt[0x3349] = 0xc9; // RET Z -> RET (to avoid: jp $C800)
160143
161144   // NMI enable / source??
162   decrypt[0x1431] = 0xc9; // HALT -> RET
163   decrypt[0x24b5] = 0x00; // HALT -> NOP
164   decrypt[0x2593] = 0x00; // HALT -> NOP
145   m_decrypt[0x1431] = 0xc9; // HALT -> RET
146   m_decrypt[0x24b5] = 0x00; // HALT -> NOP
147   m_decrypt[0x2593] = 0x00; // HALT -> NOP
165148
149   // Non-banked opcodes
150   address_space &space = m_maincpu->space(AS_PROGRAM);
151   space.set_decrypted_region(0x0000, 0x7fff, m_decrypt);
152
166153   // Data banks: 00-0f normal data decryption, 10-1f alternate data decryption:
167154   membank("bank1")->configure_entries(0, 16*2, memregion("maincpu")->base() + 0x10000, 0x4000);
168155   // Opcode banks: 00-1f normal opcode decryption:
169   membank("bank1")->configure_decrypted_entries(0, 16, decrypt + 0x10000, 0x4000);
170   membank("bank1")->configure_decrypted_entries(16, 16, decrypt + 0x10000, 0x4000);
156   membank("bank1")->configure_decrypted_entries(0, 16, m_decrypt + 0x10000, 0x4000);
157   membank("bank1")->configure_decrypted_entries(16, 16, m_decrypt + 0x10000, 0x4000);
171158}
172159
173160DRIVER_INIT_MEMBER(suna8_state,brickznv4)
174161{
175   UINT8   *RAM    =   memregion("maincpu")->base();
176   UINT8   *decrypt = brickzn_decrypt();
177   int i;
178
179   // Opcodes decrypted as data (to do: activated at run-time)
180   for (i = 0; i < 0x8000; i++)
181   {
182      if (    ((i >= 0x072b) && (i <= 0x076f)) ||
183            ((i >= 0x4541) && (i <= 0x4560)) ||
184            ((i >= 0x72f3) && (i <= 0x7322)) ||
185            ((i >= 0x79d9) && (i <= 0x7a09)) )
186      {
187         decrypt[i] = RAM[i];
188      }
189   }
190
162   m_decrypt = brickzn_decrypt();
191163   // !!!!!! PATCHES !!!!!!
192164
193165   // To do: ROM banking should be disabled here
194   decrypt[0x1190] = 0x00; // LD ($C040),A -> NOP
195   decrypt[0x1191] = 0x00; // LD ($C040),A -> NOP
196   decrypt[0x1192] = 0x00; // LD ($C040),A -> NOP
166   m_decrypt[0x1190] = 0x00; // LD ($C040),A -> NOP
167   m_decrypt[0x1191] = 0x00; // LD ($C040),A -> NOP
168   m_decrypt[0x1192] = 0x00; // LD ($C040),A -> NOP
197169
198   decrypt[0x3337] = 0xc9; // RET Z -> RET (to avoid: jp $C800)
170   m_decrypt[0x3337] = 0xc9; // RET Z -> RET (to avoid: jp $C800)
199171
200172   // NMI enable / source??
201   decrypt[0x1406] = 0xc9; // HALT -> RET
202   decrypt[0x2487] = 0x00; // HALT -> NOP
203   decrypt[0x256c] = 0x00; // HALT -> NOP
173   m_decrypt[0x1406] = 0xc9; // HALT -> RET
174   m_decrypt[0x2487] = 0x00; // HALT -> NOP
175   m_decrypt[0x256c] = 0x00; // HALT -> NOP
204176
177   // Non-banked opcodes
178   address_space &space = m_maincpu->space(AS_PROGRAM);
179   space.set_decrypted_region(0x0000, 0x7fff, m_decrypt);
180
205181   // Data banks: 00-0f normal data decryption, 10-1f alternate data decryption:
206182   membank("bank1")->configure_entries(0, 16*2, memregion("maincpu")->base() + 0x10000, 0x4000);
207183   // Opcode banks: 00-1f normal opcode decryption:
208   membank("bank1")->configure_decrypted_entries(0, 16, decrypt + 0x10000, 0x4000);
209   membank("bank1")->configure_decrypted_entries(16, 16, decrypt + 0x10000, 0x4000);
184   membank("bank1")->configure_decrypted_entries(0, 16, m_decrypt + 0x10000, 0x4000);
185   membank("bank1")->configure_decrypted_entries(16, 16, m_decrypt + 0x10000, 0x4000);
210186}
211187
212188
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700676*/
701677WRITE8_MEMBER(suna8_state::brickzn_multi_w)
702678{
703   if ((m_protection_val & 0xfc) == 0x88 || (m_protection_val & 0xfc) == 0x8c)
679   int protselect = m_protection_val & 0xfc;
680
681   if ((protselect == 0x88) || (protselect == 0x8c))
704682   {
705683      m_palettebank = data & 0x01;
706684
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713691
714692      logerror("CPU #0 - PC %04X: soundlatch = %02X\n",space.device().safe_pc(),data);
715693   }
716   else if ((m_protection_val & 0xfc) == 0x04)
694   else if (protselect == 0x04)
717695   {
718696      set_led_status(machine(), 0, data & 0x01);
719697      set_led_status(machine(), 1, data & 0x02);
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722700      logerror("CPU #0 - PC %04X: leds = %02X\n",space.device().safe_pc(),data);
723701      if (data & ~0x07)   logerror("CPU #0 - PC %04X: unknown leds bits: %02X\n",space.device().safe_pc(),data);
724702   }
725   else if ((m_protection_val & 0xfc) == 0x9c)
703   else if (protselect == 0x80)
726704   {
727      // controls opcode decryption
728      // see code at 71b, 45b7, 7380, 7a6b
729
730      // To be done: run-time opcode decryption change. Done in driver_init for now.
731
732      logerror("CPU #0 - PC %04X: op-decrypt = %02X\n",space.device().safe_pc(),data);
733   }
734   else if ((m_protection_val & 0xfc) == 0x80)
735   {
736705      // disables rom banking?
737706      // see code at 11b1:
738707
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742711   {
743712      logerror("CPU #0 - PC %04X: ignore = %02X\n",space.device().safe_pc(),data);
744713   }
714
715   if ((m_protection_val & 0x1f) == 0x1c)
716   {
717      // controls opcode decryption
718      // see code at 71b, 45b7, 7380, 7a6b
719      //printf("CPU #0 - PC %04X: alt op-decrypt tog = %02X\n",space.device().safe_pc(),data);
720      m_prot_opcode_toggle ^= 1;
721
722      if (m_prot_opcode_toggle == 0)
723      {
724         address_space &space = m_maincpu->space(AS_PROGRAM);
725         space.set_decrypted_region(0x0000, 0x7fff, m_decrypt);
726      }
727      else
728      {
729         address_space &space = m_maincpu->space(AS_PROGRAM);
730         space.set_decrypted_region(0x0000, 0x7fff, memregion("maincpu")->base());
731      }
732
733
734   }
735
745736}
746737
747738/*
trunk/src/mame/includes/suna8.h
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1616      m_samples(*this, "samples"),
1717      m_gfxdecode(*this, "gfxdecode"),
1818      m_screen(*this, "screen"),
19      m_palette(*this, "palette") { }
19      m_palette(*this, "palette"),
20     
21      m_prot_opcode_toggle(0)
22      { }
2023
2124   required_device<cpu_device> m_maincpu;
2225   optional_shared_ptr<UINT8> m_hardhead_ip;
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4144   UINT8 m_nmi_enable;
4245   UINT8 m_spritebank_latch;
4346   UINT8 m_write_disable;
44
47   UINT8 m_prot_opcode_toggle;
48   UINT8* m_decrypt;
49   
4550   enum GFXBANK_TYPE_T
4651   {
4752      GFXBANK_TYPE_SPARKMAN,

https://github.com/mamedev/mame/commit/dd257bfb065ce54d12daa0ed07a1eaed92f1a32a

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