1/*****************************************************************************\
2 Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
3 This file is licensed under the Snes9x License.
4 For further information, consult the LICENSE file in the root directory.
5\*****************************************************************************/
6
7#ifndef _SA1_H_
8#define _SA1_H_
9
10struct SSA1Registers
11{
12 uint8 DB;
13 pair P;
14 pair A;
15 pair D;
16 pair S;
17 pair X;
18 pair Y;
19 PC_t PC;
20};
21
22struct SSA1
23{
24 struct SOpcodes *S9xOpcodes;
25 uint8 *S9xOpLengths;
26 uint8 _Carry;
27 uint8 _Zero;
28 uint8 _Negative;
29 uint8 _Overflow;
30 uint32 ShiftedPB;
31 uint32 ShiftedDB;
32
33 uint32 Flags;
34 int32 Cycles;
35 int32 PrevCycles;
36 uint8 *PCBase;
37 bool8 WaitingForInterrupt;
38
39 uint8 *Map[MEMMAP_NUM_BLOCKS];
40 uint8 *WriteMap[MEMMAP_NUM_BLOCKS];
41 uint8 *BWRAM;
42
43 bool8 in_char_dma;
44 bool8 TimerIRQLastState;
45 uint16 HTimerIRQPos;
46 uint16 VTimerIRQPos;
47 int16 HCounter;
48 int16 VCounter;
49 int16 PrevHCounter;
50 int32 MemSpeed;
51 int32 MemSpeedx2;
52 int32 arithmetic_op;
53 uint16 op1;
54 uint16 op2;
55 uint64 sum;
56 bool8 overflow;
57 uint8 VirtualBitmapFormat;
58 uint8 variable_bit_pos;
59};
60
61#define SA1CheckCarry() (SA1._Carry)
62#define SA1CheckZero() (SA1._Zero == 0)
63#define SA1CheckIRQ() (SA1Registers.PL & IRQ)
64#define SA1CheckDecimal() (SA1Registers.PL & Decimal)
65#define SA1CheckIndex() (SA1Registers.PL & IndexFlag)
66#define SA1CheckMemory() (SA1Registers.PL & MemoryFlag)
67#define SA1CheckOverflow() (SA1._Overflow)
68#define SA1CheckNegative() (SA1._Negative & 0x80)
69#define SA1CheckEmulation() (SA1Registers.P.W & Emulation)
70
71#define SA1SetFlags(f) (SA1Registers.P.W |= (f))
72#define SA1ClearFlags(f) (SA1Registers.P.W &= ~(f))
73#define SA1CheckFlag(f) (SA1Registers.PL & (f))
74
75extern struct SSA1Registers SA1Registers;
76extern struct SSA1 SA1;
77extern uint8 SA1OpenBus;
78extern struct SOpcodes S9xSA1OpcodesM1X1[256];
79extern struct SOpcodes S9xSA1OpcodesM1X0[256];
80extern struct SOpcodes S9xSA1OpcodesM0X1[256];
81extern struct SOpcodes S9xSA1OpcodesM0X0[256];
82extern uint8 S9xOpLengthsM1X1[256];
83extern uint8 S9xOpLengthsM1X0[256];
84extern uint8 S9xOpLengthsM0X1[256];
85extern uint8 S9xOpLengthsM0X0[256];
86
87uint8 S9xSA1GetByte (uint32);
88void S9xSA1SetByte (uint8, uint32);
89uint16 S9xSA1GetWord (uint32, enum s9xwrap_t w = WRAP_NONE);
90void S9xSA1SetWord (uint16, uint32, enum s9xwrap_t w = WRAP_NONE, enum s9xwriteorder_t o = WRITE_01);
91void S9xSA1SetPCBase (uint32);
92uint8 S9xGetSA1 (uint32);
93void S9xSetSA1 (uint8, uint32);
94void S9xSA1Init (void);
95void S9xSA1MainLoop (void);
96void S9xSA1PostLoadState (void);
97
98static inline void S9xSA1UnpackStatus (void)
99{
100 SA1._Zero = (SA1Registers.PL & Zero) == 0;
101 SA1._Negative = (SA1Registers.PL & Negative);
102 SA1._Carry = (SA1Registers.PL & Carry);
103 SA1._Overflow = (SA1Registers.PL & Overflow) >> 6;
104}
105
106static inline void S9xSA1PackStatus (void)
107{
108 SA1Registers.PL &= ~(Zero | Negative | Carry | Overflow);
109 SA1Registers.PL |= SA1._Carry | ((SA1._Zero == 0) << 1) | (SA1._Negative & 0x80) | (SA1._Overflow << 6);
110}
111
112static inline void S9xSA1FixCycles (void)
113{
114 if (SA1CheckEmulation())
115 {
116 SA1.S9xOpcodes = S9xSA1OpcodesM1X1;
117 SA1.S9xOpLengths = S9xOpLengthsM1X1;
118 }
119 else
120 if (SA1CheckMemory())
121 {
122 if (SA1CheckIndex())
123 {
124 SA1.S9xOpcodes = S9xSA1OpcodesM1X1;
125 SA1.S9xOpLengths = S9xOpLengthsM1X1;
126 }
127 else
128 {
129 SA1.S9xOpcodes = S9xSA1OpcodesM1X0;
130 SA1.S9xOpLengths = S9xOpLengthsM1X0;
131 }
132 }
133 else
134 {
135 if (SA1CheckIndex())
136 {
137 SA1.S9xOpcodes = S9xSA1OpcodesM0X1;
138 SA1.S9xOpLengths = S9xOpLengthsM0X1;
139 }
140 else
141 {
142 SA1.S9xOpcodes = S9xSA1OpcodesM0X0;
143 SA1.S9xOpLengths = S9xOpLengthsM0X0;
144 }
145 }
146}
147
148#endif
149