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1.1 root 1: /*
2: Hatari - m68000.h
3:
4: This file is distributed under the GNU Public License, version 2 or at
5: your option any later version. Read the file gpl.txt for details.
6: */
7:
8: /* 2007/11/10 [NP] Add pairing for lsr / dbcc (and all variants */
9: /* working on register, not on memory). */
10: /* 2008/01/07 [NP] Use PairingArray to store all valid pairing */
11: /* combinations (in m68000.c) */
12: /* 2010/04/05 [NP] Rework the pairing code to take BusCyclePenalty */
13: /* into account when using d8(an,ix). */
14: /* 2010/05/07 [NP] Add BusCyclePenalty to LastInstrCycles to detect*/
15: /* a possible pairing between add.l (a5,d1.w),d0 */
16: /* and move.b 7(a5,d1.w),d5. */
17:
18:
19: #ifndef HATARI_M68000_H
20: #define HATARI_M68000_H
21:
22: #include "sysdeps.h"
23: #include "memory.h"
24: #include "newcpu.h" /* for regs */
25: #include "cycInt.h"
26: #include "log.h"
1.1.1.4 ! root 27: #include "host.h"
! 28: #include "configuration.h"
1.1 root 29:
30: /* 68000 Register defines */
31: enum {
32: REG_D0, /* D0.. */
33: REG_D1,
34: REG_D2,
35: REG_D3,
36: REG_D4,
37: REG_D5,
38: REG_D6,
39: REG_D7, /* ..D7 */
40: REG_A0, /* A0.. */
41: REG_A1,
42: REG_A2,
43: REG_A3,
44: REG_A4,
45: REG_A5,
46: REG_A6,
47: REG_A7, /* ..A7 (also SP) */
48: };
49:
50: /* 68000 Condition code's */
51: #define SR_AUX 0x0010
52: #define SR_NEG 0x0008
53: #define SR_ZERO 0x0004
54: #define SR_OVERFLOW 0x0002
55: #define SR_CARRY 0x0001
56:
57: #define SR_CLEAR_AUX 0xffef
58: #define SR_CLEAR_NEG 0xfff7
59: #define SR_CLEAR_ZERO 0xfffb
60: #define SR_CLEAR_OVERFLOW 0xfffd
61: #define SR_CLEAR_CARRY 0xfffe
62:
63: #define SR_CCODE_MASK (SR_AUX|SR_NEG|SR_ZERO|SR_OVERFLOW|SR_CARRY)
64: #define SR_MASK 0xFFE0
65:
66: #define SR_TRACEMODE 0x8000
67: #define SR_SUPERMODE 0x2000
68: #define SR_IPL 0x0700
69:
70: #define SR_CLEAR_IPL 0xf8ff
71: #define SR_CLEAR_TRACEMODE 0x7fff
72: #define SR_CLEAR_SUPERMODE 0xdfff
73:
74: /* Exception vectors */
75: #define EXCEPTION_BUSERROR 0x00000008
76: #define EXCEPTION_ADDRERROR 0x0000000c
77: #define EXCEPTION_ILLEGALINS 0x00000010
78: #define EXCEPTION_DIVZERO 0x00000014
79: #define EXCEPTION_CHK 0x00000018
80: #define EXCEPTION_TRAPV 0x0000001c
81: #define EXCEPTION_TRACE 0x00000024
82: #define EXCEPTION_LINE_A 0x00000028
83: #define EXCEPTION_LINE_F 0x0000002c
84: #define EXCEPTION_TRAP0 0x00000080
85: #define EXCEPTION_TRAP1 0x00000084
86: #define EXCEPTION_TRAP2 0x00000088
87: #define EXCEPTION_TRAP13 0x000000B4
88: #define EXCEPTION_TRAP14 0x000000B8
89:
90:
91: /* Size of 68000 instructions */
92: #define MAX_68000_INSTRUCTION_SIZE 10 /* Longest 68000 instruction is 10 bytes(6+4) */
93: #define MIN_68000_INSTRUCTION_SIZE 2 /* Smallest 68000 instruction is 2 bytes(ie NOP) */
94:
95: /* Illegal Opcode used to help emulation. eg. free entries are 8 to 15 inc' */
96: #define GEMDOS_OPCODE 8 /* Free op-code to intercept GemDOS trap */
97: #define SYSINIT_OPCODE 10 /* Free op-code to initialize system (connected drives etc.) */
98: #define VDI_OPCODE 12 /* Free op-code to call VDI handlers AFTER Trap#2 */
99:
100:
101:
102: /* Ugly hacks to adapt the main code to the different CPU cores: */
103:
104: #define Regs regs.regs
105:
106: # define M68000_GetPC() m68k_getpc()
107: # define M68000_SetPC(val) m68k_setpc(val)
108:
109: static inline Uint16 M68000_GetSR(void)
110: {
111: MakeSR();
112: return regs.sr;
113: }
114: static inline void M68000_SetSR(Uint16 v)
115: {
116: regs.sr = v;
117: MakeFromSR();
118: }
119:
120: # define M68000_SetSpecial(flags) set_special(flags)
121: # define M68000_UnsetSpecial(flags) unset_special(flags)
122:
123:
124: /* bus error mode */
125: #define BUS_ERROR_WRITE 0
126: #define BUS_ERROR_READ 1
127:
128:
1.1.1.2 root 129: /* bus access mode */
1.1 root 130: #define BUS_MODE_CPU 0 /* bus is owned by the cpu */
131: #define BUS_MODE_BLITTER 1 /* bus is owned by the blitter */
132:
133:
134: extern Uint32 BusErrorAddress;
135: extern Uint32 BusErrorPC;
136: extern bool bBusErrorReadWrite;
137: extern int BusMode;
138:
139: extern int LastOpcodeFamily;
140: extern int LastInstrCycles;
141: extern int Pairing;
142: extern char PairingArray[ MAX_OPCODE_FAMILY ][ MAX_OPCODE_FAMILY ];
143: extern const char *OpcodeName[];
144:
145: /*-----------------------------------------------------------------------*/
146: /**
147: * Add CPU cycles.
148: */
1.1.1.4 ! root 149: static inline void M68000_AddCycles(int cycles) {
! 150: nCyclesOver += cycles;
! 151:
! 152: if(PendingInterrupt.type == CYC_INT_CPU)
! 153: PendingInterrupt.time -= cycles;
! 154:
! 155: if(usCheckCycles < 0) {
! 156: if(!(CycInt_SetNewInterruptUs())) {
! 157: usCheckCycles = 100 * ConfigureParams.System.nCpuFreq;
! 158: }
! 159: } else
! 160: usCheckCycles -= cycles;
! 161: nCyclesMainCounter += cycles;
1.1 root 162: }
163:
1.1.1.4 ! root 164: void M68000_Init(void);
! 165: void M68000_Reset(bool bCold);
! 166: void M68000_Stop(void);
! 167: void M68000_Start(void);
! 168: void M68000_CheckCpuSettings(void);
! 169: void M68000_BusError(Uint32 addr, bool bReadWrite);
! 170: void M68000_Exception(Uint32 ExceptionVector , int ExceptionSource);
1.1 root 171:
172: #endif
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