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1.1 root 1: /*
1.1.1.5 root 2: Hatari - m68000.h
3:
1.1.1.16 root 4: This file is distributed under the GNU General Public License, version 2
5: or at your option any later version. Read the file gpl.txt for details.
1.1 root 6: */
7:
1.1.1.10 root 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) */
1.1.1.14 root 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:
1.1.1.10 root 18:
1.1.1.5 root 19: #ifndef HATARI_M68000_H
20: #define HATARI_M68000_H
21:
1.1.1.9 root 22: #include "cycles.h" /* for nCyclesMainCounter */
1.1.1.6 root 23: #include "sysdeps.h"
24: #include "memory.h"
1.1.1.9 root 25: #include "newcpu.h" /* for regs */
1.1.1.14 root 26: #include "cycInt.h"
1.1.1.11 root 27: #include "log.h"
28:
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,
1.1.1.16 root 47: REG_A7 /* ..A7 (also SP) */
1.1.1.11 root 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:
1.1.1.17 root 74: /* Exception numbers most commonly used in ST */
75: #define EXCEPTION_NR_BUSERROR 2
76: #define EXCEPTION_NR_ADDRERROR 3
77: #define EXCEPTION_NR_ILLEGALINS 4
78: #define EXCEPTION_NR_DIVZERO 5
79: #define EXCEPTION_NR_CHK 6
80: #define EXCEPTION_NR_TRAPV 7
81: #define EXCEPTION_NR_TRACE 9
82: #define EXCEPTION_NR_LINE_A 10
83: #define EXCEPTION_NR_LINE_F 11
84: #define EXCEPTION_NR_HBLANK 26 /* Level 2 interrupt */
85: #define EXCEPTION_NR_VBLANK 28 /* Level 4 interrupt */
86: #define EXCEPTION_NR_MFP_DSP 30 /* Level 6 interrupt */
87: #define EXCEPTION_NR_TRAP0 32
88: #define EXCEPTION_NR_TRAP1 33
89: #define EXCEPTION_NR_TRAP2 34
90: #define EXCEPTION_NR_TRAP13 45
91: #define EXCEPTION_NR_TRAP14 46
1.1.1.11 root 92:
93:
94: /* Size of 68000 instructions */
95: #define MAX_68000_INSTRUCTION_SIZE 10 /* Longest 68000 instruction is 10 bytes(6+4) */
96: #define MIN_68000_INSTRUCTION_SIZE 2 /* Smallest 68000 instruction is 2 bytes(ie NOP) */
97:
98: /* Illegal Opcode used to help emulation. eg. free entries are 8 to 15 inc' */
99: #define GEMDOS_OPCODE 8 /* Free op-code to intercept GemDOS trap */
100: #define SYSINIT_OPCODE 10 /* Free op-code to initialize system (connected drives etc.) */
101: #define VDI_OPCODE 12 /* Free op-code to call VDI handlers AFTER Trap#2 */
102:
1.1.1.16 root 103: /* Illegal opcodes used for Native Features emulation:
104: * http://wiki.aranym.org/natfeats/proposal#special_opcodes
105: */
106: #define NATFEAT_ID_OPCODE 0x7300
107: #define NATFEAT_CALL_OPCODE 0x7301
1.1.1.10 root 108:
109:
110: /* Ugly hacks to adapt the main code to the different CPU cores: */
111:
112: #define Regs regs.regs
113:
114:
115: # define M68000_GetPC() m68k_getpc()
116:
1.1.1.17 root 117: # define M68000_InstrPC regs.instruction_pc
118: # define M68000_CurrentOpcode regs.opcode
119:
1.1.1.10 root 120: # define M68000_SetSpecial(flags) set_special(flags)
121: # define M68000_UnsetSpecial(flags) unset_special(flags)
122:
123:
1.1.1.17 root 124: /* Some define's for bus error (see newcpu.c) */
125: /* Bus error read/write mode */
126: #define BUS_ERROR_WRITE 0
127: #define BUS_ERROR_READ 1
128: /* Bus error access size */
129: #define BUS_ERROR_SIZE_BYTE 1
130: #define BUS_ERROR_SIZE_WORD 2
131: #define BUS_ERROR_SIZE_LONG 4
132: /* Bus error access type */
133: #define BUS_ERROR_ACCESS_INSTR 0
134: #define BUS_ERROR_ACCESS_DATA 1
1.1.1.9 root 135:
1.1.1.10 root 136:
1.1.1.17 root 137: /* Bus access mode */
1.1.1.12 root 138: #define BUS_MODE_CPU 0 /* bus is owned by the cpu */
139: #define BUS_MODE_BLITTER 1 /* bus is owned by the blitter */
140:
141:
1.1.1.17 root 142: /* [NP] Notes on IACK :
1.1.1.16 root 143: * When an interrupt happens, it's possible a similar interrupt happens again
144: * between the start of the exception and the IACK sequence. In that case, we
145: * might have to set pending bit twice and change the interrupt vector.
1.1.1.17 root 146: *
1.1.1.18 root 147: * From the 68000's doc, IACK starts after 10 cycles (12 cycles on STF due to 2 cycle
148: * bus penalty) and is supposed to take 4 cycles if the interrupt takes a total of 44 cycles.
1.1.1.17 root 149: *
150: * On Atari STF, interrupts take 56 cycles instead of 44, which means it takes
151: * 12 extra cycles to fetch the vector number and to handle non-aligned memory accesses.
152: * From WinUAE's CE mode, we have 2 non-aligned memory accesses to wait for (ie 2+2 cycles),
153: * which leaves a total of 12 cycles to fetch the vector.
1.1.1.18 root 154: *
155: * As seen wth a custom program on STF that measures HBL's jitter, we get the same results with Hatari
156: * in CE mode if we use 10 cycles to fetch the vector (step 3), which will also add 2 cycle penalty (step 4b)
157: * This means we have at max 12+10=22 cycles after the start of the exception where some
1.1.1.17 root 158: * changes can happen (maybe it's a little less, depending on when the interrupt
159: * vector is written on the bus).
160: *
1.1.1.18 root 161: * Additionally, auto vectored interrupts (HBL and VBL) require to be in sync with E-clock,
162: * which can add 0 to 8 cycles (step 3a). In that case we have between 22+0 and 22+8 cycles
163: * to get another interrupt before vector is written on the bus.
164: *
165: * The values we use were not entirely measured on real ST hardware, they were guessed/adjusted
166: * to get the correct behaviour in some games/demos relying on this.
167: * These values are when running in CE mode (2 cycle precision) ; when CPU runs in prefetch
168: * mode, values need to be rounded to 4).
169: *
170: * Interrupt steps + WinUAE cycles (measured on real A500 HW) + ST specific values :
171: *
172: * 1 6 idle cycles
173: * 1b 2(*) ST bus access penalty (if necessary)
174: * 2 4 write PC low word
175: * 3a 0-8(*) wait for E-clock for auto vectored interrupt
176: * 3 10(*) read exception number
177: * 4 4 idle cycles
178: * 4b 2(*) ST bus access penalty
179: * 5 4 write SR
180: * 6 4 write PC high word
181: * 7 4 read exception address high word
182: * 8 4 read exception address low word
183: * 9 4 prefetch
184: * 10 2 idle cycles
185: * 10b 2(*) ST bus access penalty
186: * 11 4 prefetch
187: * TOTAL = 56
1.1.1.17 root 188: *
189: * (*) ST specific timings
1.1.1.16 root 190: */
191:
1.1.1.18 root 192: /* Values for IACK sequence when running in cycle exact mode */
193: #define CPU_IACK_CYCLES_MFP_CE 12 /* vector sent by the MFP (TODO value not measured on real STF) */
194: #define CPU_IACK_CYCLES_VIDEO_CE 10 /* auto vectored for HBL/VBL (value measured on real STF) */
195:
196: /* Values for IACK sequence when running in normal/prefetch mode or when using old UAE CPU */
197: #define CPU_IACK_CYCLES_START 12 /* number of cycles before starting the IACK when not using CE mode */
198: /* (this should be a multiple of 4, else it will be rounded by M68000_AddCycles) */
199: #define CPU_IACK_CYCLES_MFP 12 /* vector sent by the MFP */
200: #define CPU_IACK_CYCLES_VIDEO 12 /* auto vectored for HBL/VBL */
1.1.1.16 root 201:
1.1.1.17 root 202: /* Informations about current CPU instruction */
1.1.1.16 root 203: typedef struct {
1.1.1.17 root 204: /* These are provided only by WinUAE CPU core */
205: int I_Cache_miss; /* Instruction cache for 68020/30/40/60 */
206: int I_Cache_hit;
207: int D_Cache_miss; /* Data cache for 68030/40/60 */
208: int D_Cache_hit;
1.1.1.16 root 209:
210: /* TODO: move other instruction specific Hatari variables here */
211: } cpu_instruction_t;
212:
213: extern cpu_instruction_t CpuInstruction;
214:
1.1.1.7 root 215: extern Uint32 BusErrorAddress;
1.1.1.11 root 216: extern bool bBusErrorReadWrite;
1.1.1.7 root 217: extern int nCpuFreqShift;
1.1.1.18 root 218: extern int WaitStateCycles;
1.1.1.12 root 219: extern int BusMode;
1.1.1.16 root 220: extern bool CPU_IACK;
1.1.1.6 root 221:
1.1.1.10 root 222: extern int LastOpcodeFamily;
223: extern int LastInstrCycles;
224: extern int Pairing;
225: extern char PairingArray[ MAX_OPCODE_FAMILY ][ MAX_OPCODE_FAMILY ];
226: extern const char *OpcodeName[];
227:
1.1.1.6 root 228:
229: /*-----------------------------------------------------------------------*/
1.1.1.10 root 230: /**
231: * Add CPU cycles.
232: * NOTE: All times are rounded up to nearest 4 cycles.
233: */
1.1.1.6 root 234: static inline void M68000_AddCycles(int cycles)
235: {
1.1.1.10 root 236: cycles = (cycles + 3) & ~3;
1.1.1.18 root 237: PendingInterruptCount -= INT_CONVERT_TO_INTERNAL ( cycles , INT_CPU_CYCLE );
1.1.1.9 root 238: nCyclesMainCounter += cycles;
1.1.1.16 root 239: CyclesGlobalClockCounter += cycles;
1.1.1.6 root 240: }
1.1.1.5 root 241:
1.1.1.10 root 242:
243: /*-----------------------------------------------------------------------*/
244: /**
1.1.1.14 root 245: * Add CPU cycles, take cycles pairing into account. Pairing will make
246: * some specific instructions take 4 cycles less when run one after the other.
247: * Pairing happens when the 2 instructions are "aligned" on different bus accesses.
248: * Candidates are :
249: * - 2 instructions taking 4n+2 cycles
250: * - 1 instruction taking 4n+2 cycles, followed by 1 instruction using d8(an,ix)
251: *
252: * Not all the candidate instructions can pair, only the opcodes listed in PairingArray.
253: * On ST, when using d8(an,ix), we get an extra 2 cycle penalty for misaligned bus access.
254: * The only instruction that can generate BusCyclePenalty=4 is move d8(an,ix),d8(an,ix)
255: * and although it takes 4n cycles (24 for .b/.w or 32 for .l) it can pair with
256: * a previous 4n+2 instruction (but it will still have 1 misaligned bus access in the end).
257: *
258: * Verified pairing on an STF :
259: * - lsl.w #4,d1 + move.w 0(a4,d2.w),d1 motorola=14+14=28 stf=28
260: * - lsl.w #4,d1 + move.w 0(a4,d2.w),(a4) motorola=14+18=32 stf=32
261: * - lsl.w #4,d1 + move.w 0(a4,d2.w),0(a4,d2.w) motorola=14+24=38 stf=40
262: * - add.l (a5,d1.w),d0 + move.b 7(a5,d1.w),d5) motorola=20+14=34 stf=36
263: *
264: * d8(an,ix) timings without pairing (2 cycles penalty) :
265: * - add.l 0(a4,d2.w),a1 motorola=20 stf=24
266: * - move.w 0(a4,d2.w),d1 motorola=14 stf=16
267: * - move.w 0(a4,d2.w),(a4) motorola=18 stf=20
268: * - move.w 0(a4,d2.w),0(a4,d2.w) motorola=24 stf=28
269: *
1.1.1.10 root 270: * NOTE: All times are rounded up to nearest 4 cycles.
271: */
272: static inline void M68000_AddCyclesWithPairing(int cycles)
273: {
274: Pairing = 0;
275: /* Check if number of cycles for current instr and for */
276: /* the previous one is of the form 4+2n */
277: /* If so, a pairing could be possible depending on the opcode */
1.1.1.14 root 278: /* A pairing is also possible if current instr is 4n but with BusCyclePenalty > 0 */
1.1.1.10 root 279: if ( ( PairingArray[ LastOpcodeFamily ][ OpcodeFamily ] == 1 )
1.1.1.14 root 280: && ( ( LastInstrCycles & 3 ) == 2 )
281: && ( ( ( cycles & 3 ) == 2 ) || ( BusCyclePenalty > 0 ) ) )
1.1.1.10 root 282: {
283: Pairing = 1;
1.1.1.13 root 284: LOG_TRACE(TRACE_CPU_PAIRING,
285: "cpu pairing detected pc=%x family %s/%s cycles %d/%d\n",
286: m68k_getpc(), OpcodeName[LastOpcodeFamily],
287: OpcodeName[OpcodeFamily], LastInstrCycles, cycles);
1.1.1.10 root 288: }
289:
1.1.1.11 root 290: /* [NP] This part is only needed to track possible pairing instructions, */
291: /* we can keep it disabled most of the time */
292: #if 0
293: if ( (LastOpcodeFamily!=OpcodeFamily) && ( Pairing == 0 )
294: && ( ( cycles & 3 ) == 2 ) && ( ( LastInstrCycles & 3 ) == 2 ) )
295: {
1.1.1.13 root 296: LOG_TRACE(TRACE_CPU_PAIRING,
297: "cpu could pair pc=%x family %s/%s cycles %d/%d\n",
298: m68k_getpc(), OpcodeName[LastOpcodeFamily],
299: OpcodeName[OpcodeFamily], LastInstrCycles, cycles);
1.1.1.11 root 300: }
301: #endif
302:
1.1.1.10 root 303: /* Store current instr (not rounded) to check next time */
1.1.1.14 root 304: LastInstrCycles = cycles + BusCyclePenalty;
1.1.1.10 root 305: LastOpcodeFamily = OpcodeFamily;
306:
1.1.1.16 root 307: /* If pairing is true, we need to subtract 2 cycles for the */
1.1.1.10 root 308: /* previous instr which was rounded to 4 cycles while it wasn't */
309: /* needed (and we don't round the current one) */
310: /* -> both instr will take 4 cycles less on the ST than if ran */
311: /* separately. */
312: if (Pairing == 1)
1.1.1.14 root 313: {
314: if ( ( cycles & 3 ) == 2 ) /* pairing between 4n+2 and 4n+2 instructions */
315: cycles -= 2; /* if we have a pairing, we should not count the misaligned bus access */
316:
317: else /* this is the case of move d8(an,ix),d8(an,ix) where BusCyclePenalty=4 */
318: /*do nothing */; /* we gain 2 cycles for the pairing with 1st d8(an,ix) */
319: /* and we have 1 remaining misaligned access for the 2nd d8(an,ix). So in the end, we keep */
320: /* cycles unmodified as 4n cycles (eg lsl.w #4,d1 + move.w 0(a4,d2.w),0(a4,d2.w) takes 40 cycles) */
321: }
1.1.1.10 root 322: else
1.1.1.14 root 323: {
324: cycles += BusCyclePenalty; /* >0 if d8(an,ix) was used */
325: cycles = (cycles + 3) & ~3; /* no pairing, round current instr to 4 cycles */
326: }
1.1.1.10 root 327:
1.1.1.18 root 328: PendingInterruptCount -= INT_CONVERT_TO_INTERNAL ( cycles , INT_CPU_CYCLE );
1.1.1.10 root 329:
330: nCyclesMainCounter += cycles;
1.1.1.16 root 331: CyclesGlobalClockCounter += cycles;
1.1.1.14 root 332: BusCyclePenalty = 0;
1.1.1.10 root 333: }
334:
335:
1.1.1.18 root 336: /*-----------------------------------------------------------------------*/
337: /**
338: * Add CPU cycles when using WinUAE CPU 'cycle exact' mode.
339: * In this mode, we should not round cycles to the next nearest 4 cycles
340: * because all memory accesses will already be aligned to 4 cycles when
341: * using CE mode.
342: * The CE mode will also give the correct 'instruction pairing' for all
343: * opcodes/addressing mode, without requiring tables/heuristics (in the
344: * same way that it's done in real hardware)
345: */
346: static inline void M68000_AddCycles_CE(int cycles)
347: {
348: PendingInterruptCount -= INT_CONVERT_TO_INTERNAL ( cycles , INT_CPU_CYCLE );
349:
350: nCyclesMainCounter += cycles;
351: CyclesGlobalClockCounter += cycles;
352: }
353:
354:
355:
1.1.1.14 root 356: extern void M68000_Init(void);
1.1.1.11 root 357: extern void M68000_Reset(bool bCold);
1.1.1.10 root 358: extern void M68000_Start(void);
1.1.1.15 root 359: extern void M68000_CheckCpuSettings(void);
1.1.1.11 root 360: extern void M68000_MemorySnapShot_Capture(bool bSave);
1.1.1.17 root 361: extern void M68000_BusError ( Uint32 addr , int ReadWrite , int Size , int AccessType );
362: extern void M68000_Exception(Uint32 ExceptionNr , int ExceptionSource);
363: extern void M68000_Update_intlev ( void );
1.1.1.18 root 364: extern void M68000_WaitState(int WaitCycles);
1.1.1.16 root 365: extern int M68000_WaitEClock ( void );
1.1.1.18 root 366: extern void M68000_SyncCpuBus_OnReadAccess ( void );
367: extern void M68000_SyncCpuBus_OnWriteAccess ( void );
1.1.1.17 root 368: extern void M68000_Flush_Instr_Cache ( uaecptr addr , int size );
369: extern void M68000_Flush_Data_Cache ( uaecptr addr , int size );
370: extern void M68000_Flush_All_Caches ( uaecptr addr , int size );
1.1.1.19! root 371: extern void M68000_SetBlitter_CE ( bool ce_mode );
1.1.1.18 root 372: extern int DMA_MaskAddressHigh ( void );
373: extern void M68000_ChangeCpuFreq ( void );
1.1.1.19! root 374: extern Uint16 M68000_GetSR ( void );
! 375: extern void M68000_SetSR ( Uint16 v );
! 376: extern void M68000_SetPC ( uaecptr v );
1.1.1.5 root 377:
378: #endif
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