--- hatari/src/includes/m68000.h 2019/04/01 07:12:14 1.1.1.7 +++ hatari/src/includes/m68000.h 2019/04/09 08:55:41 1.1.1.17 @@ -1,47 +1,351 @@ /* Hatari - m68000.h - This file is distributed under the GNU Public License, version 2 or at - your option any later version. Read the file gpl.txt for details. + This file is distributed under the GNU General Public License, version 2 + or at your option any later version. Read the file gpl.txt for details. */ +/* 2007/11/10 [NP] Add pairing for lsr / dbcc (and all variants */ +/* working on register, not on memory). */ +/* 2008/01/07 [NP] Use PairingArray to store all valid pairing */ +/* combinations (in m68000.c) */ +/* 2010/04/05 [NP] Rework the pairing code to take BusCyclePenalty */ +/* into account when using d8(an,ix). */ +/* 2010/05/07 [NP] Add BusCyclePenalty to LastInstrCycles to detect*/ +/* a possible pairing between add.l (a5,d1.w),d0 */ +/* and move.b 7(a5,d1.w),d5. */ + + #ifndef HATARI_M68000_H #define HATARI_M68000_H -#include "sound.h" /* for SoundCycles */ +#include "cycles.h" /* for nCyclesMainCounter */ #include "sysdeps.h" #include "memory.h" -#include "newcpu.h" /* for regs */ +#include "newcpu.h" /* for regs */ +#include "cycInt.h" +#include "log.h" + + +/* 68000 Register defines */ +enum { + REG_D0, /* D0.. */ + REG_D1, + REG_D2, + REG_D3, + REG_D4, + REG_D5, + REG_D6, + REG_D7, /* ..D7 */ + REG_A0, /* A0.. */ + REG_A1, + REG_A2, + REG_A3, + REG_A4, + REG_A5, + REG_A6, + REG_A7 /* ..A7 (also SP) */ +}; + +/* 68000 Condition code's */ +#define SR_AUX 0x0010 +#define SR_NEG 0x0008 +#define SR_ZERO 0x0004 +#define SR_OVERFLOW 0x0002 +#define SR_CARRY 0x0001 + +#define SR_CLEAR_AUX 0xffef +#define SR_CLEAR_NEG 0xfff7 +#define SR_CLEAR_ZERO 0xfffb +#define SR_CLEAR_OVERFLOW 0xfffd +#define SR_CLEAR_CARRY 0xfffe + +#define SR_CCODE_MASK (SR_AUX|SR_NEG|SR_ZERO|SR_OVERFLOW|SR_CARRY) +#define SR_MASK 0xFFE0 + +#define SR_TRACEMODE 0x8000 +#define SR_SUPERMODE 0x2000 +#define SR_IPL 0x0700 + +#define SR_CLEAR_IPL 0xf8ff +#define SR_CLEAR_TRACEMODE 0x7fff +#define SR_CLEAR_SUPERMODE 0xdfff + +/* Exception numbers most commonly used in ST */ +#define EXCEPTION_NR_BUSERROR 2 +#define EXCEPTION_NR_ADDRERROR 3 +#define EXCEPTION_NR_ILLEGALINS 4 +#define EXCEPTION_NR_DIVZERO 5 +#define EXCEPTION_NR_CHK 6 +#define EXCEPTION_NR_TRAPV 7 +#define EXCEPTION_NR_TRACE 9 +#define EXCEPTION_NR_LINE_A 10 +#define EXCEPTION_NR_LINE_F 11 +#define EXCEPTION_NR_HBLANK 26 /* Level 2 interrupt */ +#define EXCEPTION_NR_VBLANK 28 /* Level 4 interrupt */ +#define EXCEPTION_NR_MFP_DSP 30 /* Level 6 interrupt */ +#define EXCEPTION_NR_TRAP0 32 +#define EXCEPTION_NR_TRAP1 33 +#define EXCEPTION_NR_TRAP2 34 +#define EXCEPTION_NR_TRAP13 45 +#define EXCEPTION_NR_TRAP14 46 + + +/* Size of 68000 instructions */ +#define MAX_68000_INSTRUCTION_SIZE 10 /* Longest 68000 instruction is 10 bytes(6+4) */ +#define MIN_68000_INSTRUCTION_SIZE 2 /* Smallest 68000 instruction is 2 bytes(ie NOP) */ + +/* Illegal Opcode used to help emulation. eg. free entries are 8 to 15 inc' */ +#define GEMDOS_OPCODE 8 /* Free op-code to intercept GemDOS trap */ +#define SYSINIT_OPCODE 10 /* Free op-code to initialize system (connected drives etc.) */ +#define VDI_OPCODE 12 /* Free op-code to call VDI handlers AFTER Trap#2 */ + +/* Illegal opcodes used for Native Features emulation: + * http://wiki.aranym.org/natfeats/proposal#special_opcodes + */ +#define NATFEAT_ID_OPCODE 0x7300 +#define NATFEAT_CALL_OPCODE 0x7301 + + +/* Ugly hacks to adapt the main code to the different CPU cores: */ + +#define Regs regs.regs + + +# define M68000_GetPC() m68k_getpc() +# define M68000_SetPC(val) m68k_setpc(val) + +# define M68000_InstrPC regs.instruction_pc +# define M68000_CurrentOpcode regs.opcode + + +static inline Uint16 M68000_GetSR(void) +{ + MakeSR(); + return regs.sr; +} +static inline void M68000_SetSR(Uint16 v) +{ + regs.sr = v; + MakeFromSR(); +} + +# define M68000_SetSpecial(flags) set_special(flags) +# define M68000_UnsetSpecial(flags) unset_special(flags) -#define Regs regs.regs /* Ugly hack to glue the WinSTon sources to the UAE CPU core. */ -#define SR regs.sr /* Don't forget to call MakeFromSR() and MakeSR() */ +/* Some define's for bus error (see newcpu.c) */ +/* Bus error read/write mode */ +#define BUS_ERROR_WRITE 0 +#define BUS_ERROR_READ 1 +/* Bus error access size */ +#define BUS_ERROR_SIZE_BYTE 1 +#define BUS_ERROR_SIZE_WORD 2 +#define BUS_ERROR_SIZE_LONG 4 +/* Bus error access type */ +#define BUS_ERROR_ACCESS_INSTR 0 +#define BUS_ERROR_ACCESS_DATA 1 + + +/* Bus access mode */ +#define BUS_MODE_CPU 0 /* bus is owned by the cpu */ +#define BUS_MODE_BLITTER 1 /* bus is owned by the blitter */ + + +/* [NP] Notes on IACK : + * When an interrupt happens, it's possible a similar interrupt happens again + * between the start of the exception and the IACK sequence. In that case, we + * might have to set pending bit twice and change the interrupt vector. + * + * From the 68000's doc, IACK starts after 10 cycles (12 cycles on STF) and is + * supposed to take 4 cycles if the interrupt takes a total of 44 cycles. + * + * On Atari STF, interrupts take 56 cycles instead of 44, which means it takes + * 12 extra cycles to fetch the vector number and to handle non-aligned memory accesses. + * From WinUAE's CE mode, we have 2 non-aligned memory accesses to wait for (ie 2+2 cycles), + * which leaves a total of 12 cycles to fetch the vector. + * This means we have at max 12+12=24 cycles after the start of the exception where some + * changes can happen (maybe it's a little less, depending on when the interrupt + * vector is written on the bus). + * + * The values we use were not measured on real ST hardware, they were adjusted + * to get the correct behaviour in some games/demos relying on this ; since timings + * are rounded to 4 on ST, it's possible the interrupt takes 54 cycles and not 56. + * + * WinUAE cycles (measured on real A500 HW) : + * + * 6 idle cycles + * 2(*) ST bus access penalty + * 4 write PC low word + * 12(*) read exception number + * 4 idle cycles + * 4 write SR + * 4 write PC high word + * 4 read exception address high word + * 4 read exception address low word + * 4 prefetch + * 2 idle cycles + * 2(*) ST bus access penalty + * 4 prefetch + * TOTAL = 56 + * + * (*) ST specific timings + */ +#define CPU_IACK_CYCLES_START 12 /* number of cycles before starting the IACK */ +#define CPU_IACK_CYCLES_MFP 12 /* vector sent by the MFP */ +#define CPU_IACK_CYCLES_VIDEO 12 /* auto vectored for HBL/VBL */ + + +/* Informations about current CPU instruction */ +typedef struct { + /* These are provided only by WinUAE CPU core */ + int I_Cache_miss; /* Instruction cache for 68020/30/40/60 */ + int I_Cache_hit; + int D_Cache_miss; /* Data cache for 68030/40/60 */ + int D_Cache_hit; -extern void *PendingInterruptFunction; -extern short int PendingInterruptCount; + /* TODO: move other instruction specific Hatari variables here */ +} cpu_instruction_t; + +extern cpu_instruction_t CpuInstruction; extern Uint32 BusErrorAddress; -extern Uint32 BusErrorPC; -extern BOOL bBusErrorReadWrite; +extern bool bBusErrorReadWrite; extern int nCpuFreqShift; +extern int nWaitStateCycles; +extern int BusMode; +extern bool CPU_IACK; + +extern int LastOpcodeFamily; +extern int LastInstrCycles; +extern int Pairing; +extern char PairingArray[ MAX_OPCODE_FAMILY ][ MAX_OPCODE_FAMILY ]; +extern const char *OpcodeName[]; /*-----------------------------------------------------------------------*/ -/* - Add CPU cycles. - NOTE: All times are rounded up to nearest 4 cycles. -*/ +/** + * Add CPU cycles. + * NOTE: All times are rounded up to nearest 4 cycles. + */ static inline void M68000_AddCycles(int cycles) { - cycles = ((cycles + 3) & ~3) >> nCpuFreqShift; - PendingInterruptCount -= cycles; - SoundCycles += cycles; + cycles = (cycles + 3) & ~3; + cycles = cycles >> nCpuFreqShift; + + PendingInterruptCount -= INT_CONVERT_TO_INTERNAL(cycles, INT_CPU_CYCLE); + nCyclesMainCounter += cycles; + CyclesGlobalClockCounter += cycles; +} + + +/*-----------------------------------------------------------------------*/ +/** + * Add CPU cycles, take cycles pairing into account. Pairing will make + * some specific instructions take 4 cycles less when run one after the other. + * Pairing happens when the 2 instructions are "aligned" on different bus accesses. + * Candidates are : + * - 2 instructions taking 4n+2 cycles + * - 1 instruction taking 4n+2 cycles, followed by 1 instruction using d8(an,ix) + * + * Not all the candidate instructions can pair, only the opcodes listed in PairingArray. + * On ST, when using d8(an,ix), we get an extra 2 cycle penalty for misaligned bus access. + * The only instruction that can generate BusCyclePenalty=4 is move d8(an,ix),d8(an,ix) + * and although it takes 4n cycles (24 for .b/.w or 32 for .l) it can pair with + * a previous 4n+2 instruction (but it will still have 1 misaligned bus access in the end). + * + * Verified pairing on an STF : + * - lsl.w #4,d1 + move.w 0(a4,d2.w),d1 motorola=14+14=28 stf=28 + * - lsl.w #4,d1 + move.w 0(a4,d2.w),(a4) motorola=14+18=32 stf=32 + * - lsl.w #4,d1 + move.w 0(a4,d2.w),0(a4,d2.w) motorola=14+24=38 stf=40 + * - add.l (a5,d1.w),d0 + move.b 7(a5,d1.w),d5) motorola=20+14=34 stf=36 + * + * d8(an,ix) timings without pairing (2 cycles penalty) : + * - add.l 0(a4,d2.w),a1 motorola=20 stf=24 + * - move.w 0(a4,d2.w),d1 motorola=14 stf=16 + * - move.w 0(a4,d2.w),(a4) motorola=18 stf=20 + * - move.w 0(a4,d2.w),0(a4,d2.w) motorola=24 stf=28 + * + * NOTE: All times are rounded up to nearest 4 cycles. + */ +static inline void M68000_AddCyclesWithPairing(int cycles) +{ + Pairing = 0; + /* Check if number of cycles for current instr and for */ + /* the previous one is of the form 4+2n */ + /* If so, a pairing could be possible depending on the opcode */ + /* A pairing is also possible if current instr is 4n but with BusCyclePenalty > 0 */ + if ( ( PairingArray[ LastOpcodeFamily ][ OpcodeFamily ] == 1 ) + && ( ( LastInstrCycles & 3 ) == 2 ) + && ( ( ( cycles & 3 ) == 2 ) || ( BusCyclePenalty > 0 ) ) ) + { + Pairing = 1; + LOG_TRACE(TRACE_CPU_PAIRING, + "cpu pairing detected pc=%x family %s/%s cycles %d/%d\n", + m68k_getpc(), OpcodeName[LastOpcodeFamily], + OpcodeName[OpcodeFamily], LastInstrCycles, cycles); + } + + /* [NP] This part is only needed to track possible pairing instructions, */ + /* we can keep it disabled most of the time */ +#if 0 + if ( (LastOpcodeFamily!=OpcodeFamily) && ( Pairing == 0 ) + && ( ( cycles & 3 ) == 2 ) && ( ( LastInstrCycles & 3 ) == 2 ) ) + { + LOG_TRACE(TRACE_CPU_PAIRING, + "cpu could pair pc=%x family %s/%s cycles %d/%d\n", + m68k_getpc(), OpcodeName[LastOpcodeFamily], + OpcodeName[OpcodeFamily], LastInstrCycles, cycles); + } +#endif + + /* Store current instr (not rounded) to check next time */ + LastInstrCycles = cycles + BusCyclePenalty; + LastOpcodeFamily = OpcodeFamily; + + /* If pairing is true, we need to subtract 2 cycles for the */ + /* previous instr which was rounded to 4 cycles while it wasn't */ + /* needed (and we don't round the current one) */ + /* -> both instr will take 4 cycles less on the ST than if ran */ + /* separately. */ + if (Pairing == 1) + { + if ( ( cycles & 3 ) == 2 ) /* pairing between 4n+2 and 4n+2 instructions */ + cycles -= 2; /* if we have a pairing, we should not count the misaligned bus access */ + + else /* this is the case of move d8(an,ix),d8(an,ix) where BusCyclePenalty=4 */ + /*do nothing */; /* we gain 2 cycles for the pairing with 1st d8(an,ix) */ + /* and we have 1 remaining misaligned access for the 2nd d8(an,ix). So in the end, we keep */ + /* cycles unmodified as 4n cycles (eg lsl.w #4,d1 + move.w 0(a4,d2.w),0(a4,d2.w) takes 40 cycles) */ + } + else + { + cycles += BusCyclePenalty; /* >0 if d8(an,ix) was used */ + cycles = (cycles + 3) & ~3; /* no pairing, round current instr to 4 cycles */ + } + + cycles = cycles >> nCpuFreqShift; + + PendingInterruptCount -= INT_CONVERT_TO_INTERNAL ( cycles , INT_CPU_CYCLE ); + + nCyclesMainCounter += cycles; + CyclesGlobalClockCounter += cycles; + BusCyclePenalty = 0; } -extern void M68000_Reset(BOOL bCold); -extern void M68000_MemorySnapShot_Capture(BOOL bSave); -extern void M68000_BusError(unsigned long addr, BOOL bReadWrite); -extern void M68000_Exception(Uint32 ExceptionVector); -extern void M68000_WaitState(void); + +extern void M68000_Init(void); +extern void M68000_Reset(bool bCold); +extern void M68000_Start(void); +extern void M68000_CheckCpuSettings(void); +extern void M68000_MemorySnapShot_Capture(bool bSave); +extern void M68000_BusError ( Uint32 addr , int ReadWrite , int Size , int AccessType ); +extern void M68000_Exception(Uint32 ExceptionNr , int ExceptionSource); +extern void M68000_Update_intlev ( void ); +extern void M68000_WaitState(int nCycles); +extern int M68000_WaitEClock ( void ); +extern void M68000_Flush_Instr_Cache ( uaecptr addr , int size ); +extern void M68000_Flush_Data_Cache ( uaecptr addr , int size ); +extern void M68000_Flush_All_Caches ( uaecptr addr , int size ); #endif