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111
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1 /* PR tree-optimization/34046 */
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2 /* Origin: dcb <dcb314@hotmail.com> */
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3
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4 typedef unsigned char bool8;
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5 typedef unsigned char uint8_t;
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6 typedef unsigned short int uint16_t;
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7 typedef unsigned int uint32_t;
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8 typedef uint8_t uint8;
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9 typedef uint16_t uint16;
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10 typedef uint32_t uint32;
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11
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12 struct SIAPU
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13 {
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14 uint8 *PC;
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15 uint8 *RAM;
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16 uint8 Bit;
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17 uint32 Address;
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18 uint8 *WaitAddress1;
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19 uint8 *WaitAddress2;
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20 uint8 _Carry;
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21 };
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22
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23 struct SAPU
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24 {
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25 bool8 ShowROM;
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26 uint8 OutPorts [4];
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27 uint8 ExtraRAM [64];
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28 uint16 TimerTarget [3];
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29 };
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30
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31 struct SAPU APU;
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32 struct SIAPU IAPU;
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33
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34 void S9xSetAPUControl (uint8 byte);
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35 void S9xSetAPUDSP (uint8 byte);
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36 uint8 S9xGetAPUDSP ();
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37
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38 uint8 S9xAPUGetByte (uint32 Address)
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39 {
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40 Address &= 0xffff;
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41
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42 if (Address <= 0xff && Address >= 0xf0)
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43 {
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44 if (Address >= 0xf4 && Address <= 0xf7)
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45 {
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46 IAPU.WaitAddress2 = IAPU.WaitAddress1;
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47 IAPU.WaitAddress1 = IAPU.PC;
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48 return (IAPU.RAM [Address]);
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49 }
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50 else if (Address == 0xf3)
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51 return (S9xGetAPUDSP ());
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52
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53 if (Address >= 0xfd)
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54 {
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55 IAPU.WaitAddress2 = IAPU.WaitAddress1;
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56 IAPU.WaitAddress1 = IAPU.PC;
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57 uint8 t = IAPU.RAM [Address];
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58 IAPU.RAM [Address] = 0;
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59 return (t);
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60 }
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61
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62 return (IAPU.RAM [Address]);
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63 }
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64 else
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65 return (IAPU.RAM [Address]);
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66 }
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67
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68 void S9xAPUSetByte (uint8 byte, uint32 Address)
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69 {
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70 Address &= 0xffff;
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71
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72 if (Address <= 0xff && Address >= 0xf0)
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73 {
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74 if (Address == 0xf3)
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75 S9xSetAPUDSP (byte);
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76 else if (Address >= 0xf4 && Address <= 0xf7)
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77 APU.OutPorts [Address - 0xf4] = byte;
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78 else if (Address == 0xf1)
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79 S9xSetAPUControl (byte);
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80 else if (Address < 0xfd)
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81 {
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82 IAPU.RAM [Address] = byte;
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83 if (Address >= 0xfa)
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84 {
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85 if (byte == 0)
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86 APU.TimerTarget [Address - 0xfa] = 0x100;
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87 else
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88 APU.TimerTarget [Address - 0xfa] = byte;
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89 }
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90 }
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91 }
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92 else
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93 {
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94 if (Address < 0xffc0)
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95 IAPU.RAM [Address] = byte;
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96 else
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97 {
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98 APU.ExtraRAM [Address - 0xffc0] = byte;
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99 if (!APU.ShowROM)
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100 IAPU.RAM [Address] = byte;
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101 }
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102 }
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103 }
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104
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105 void ApuCA ()
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106 {
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107 IAPU.Address = *(uint16 *) (IAPU.PC + 1);
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108 IAPU.Bit = (uint8)(IAPU.Address >> 13);
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109 if ((IAPU._Carry))
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110 S9xAPUSetByte (S9xAPUGetByte (IAPU.Address) | (1 << IAPU.Bit), IAPU.Address);
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111 else
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112 S9xAPUSetByte (S9xAPUGetByte (IAPU.Address) & ~(1 << IAPU.Bit), IAPU.Address);
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113 }
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