diff options
Diffstat (limited to 'trunk/src/emu/cpu/nec/necpriv.h')
-rw-r--r-- | trunk/src/emu/cpu/nec/necpriv.h | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/trunk/src/emu/cpu/nec/necpriv.h b/trunk/src/emu/cpu/nec/necpriv.h new file mode 100644 index 00000000000..ae27a451f9c --- /dev/null +++ b/trunk/src/emu/cpu/nec/necpriv.h @@ -0,0 +1,174 @@ +/* Cpu types, steps of 8 to help the cycle count calculation */ +#define V33_TYPE 0 +#define V30_TYPE 8 +#define V20_TYPE 16 + +#ifndef FALSE +#define FALSE 0 +#define TRUE 1 +#endif + +/* interrupt vectors */ +enum +{ + NEC_DIVIDE_VECTOR = 0, + NEC_TRAP_VECTOR = 1, + NEC_NMI_VECTOR = 2, + NEC_BRKV_VECTOR = 4, + NEC_CHKIND_VECTOR = 5, +}; + +/* interrupt sources */ +typedef enum +{ + BRK = 0, + INT_IRQ = 1, + NMI_IRQ = 2, +} INTSOURCES; + +/* NEC registers */ +typedef union +{ /* eight general registers */ + UINT16 w[8]; /* viewed as 16 bits registers */ + UINT8 b[16]; /* or as 8 bit registers */ +} necbasicregs; + +typedef struct _nec_state_t nec_state_t; +struct _nec_state_t +{ + necbasicregs regs; + offs_t fetch_xor; + UINT16 sregs[4]; + + UINT16 ip; + + /* PSW flags */ + INT32 SignVal; + UINT32 AuxVal, OverVal, ZeroVal, CarryVal, ParityVal; /* 0 or non-0 valued flags */ + UINT8 TF, IF, DF, MF; /* 0 or 1 valued flags */ + + /* interrupt related */ + UINT32 pending_irq; + UINT32 nmi_state; + UINT32 irq_state; + UINT32 poll_state; + UINT8 no_interrupt; + UINT8 halted; + + device_irq_callback irq_callback; + legacy_cpu_device *device; + address_space *program; + direct_read_data *direct; + address_space *io; + int icount; + + UINT8 prefetch_size; + UINT8 prefetch_cycles; + INT8 prefetch_count; + UINT8 prefetch_reset; + UINT32 chip_type; + + UINT32 prefix_base; /* base address of the latest prefix segment */ + UINT8 seg_prefix; /* prefix segment indicator */ +}; + +typedef enum { DS1, PS, SS, DS0 } SREGS; +typedef enum { AW, CW, DW, BW, SP, BP, IX, IY } WREGS; +typedef enum { + AL = NATIVE_ENDIAN_VALUE_LE_BE(0x0, 0x1), + AH = NATIVE_ENDIAN_VALUE_LE_BE(0x1, 0x0), + CL = NATIVE_ENDIAN_VALUE_LE_BE(0x2, 0x3), + CH = NATIVE_ENDIAN_VALUE_LE_BE(0x3, 0x2), + DL = NATIVE_ENDIAN_VALUE_LE_BE(0x4, 0x5), + DH = NATIVE_ENDIAN_VALUE_LE_BE(0x5, 0x4), + BL = NATIVE_ENDIAN_VALUE_LE_BE(0x6, 0x7), + BH = NATIVE_ENDIAN_VALUE_LE_BE(0x7, 0x6), +} BREGS; + +#define Sreg(x) nec_state->sregs[x] +#define Wreg(x) nec_state->regs.w[x] +#define Breg(x) nec_state->regs.b[x] + +#define PC(n) ((Sreg(PS)<<4)+(n)->ip) + +#define CF (nec_state->CarryVal!=0) +#define SF (nec_state->SignVal<0) +#define ZF (nec_state->ZeroVal==0) +#define PF parity_table[(BYTE)nec_state->ParityVal] +#define AF (nec_state->AuxVal!=0) +#define OF (nec_state->OverVal!=0) + +/************************************************************************/ + +#define read_mem_byte(a) nec_state->program->read_byte(a) +#define read_mem_word(a) nec_state->program->read_word_unaligned(a) +#define write_mem_byte(a,d) nec_state->program->write_byte((a),(d)) +#define write_mem_word(a,d) nec_state->program->write_word_unaligned((a),(d)) + +#define read_port_byte(a) nec_state->io->read_byte(a) +#define read_port_word(a) nec_state->io->read_word_unaligned(a) +#define write_port_byte(a,d) nec_state->io->write_byte((a),(d)) +#define write_port_word(a,d) nec_state->io->write_word_unaligned((a),(d)) + +/************************************************************************/ + +#define CHANGE_PC do { EMPTY_PREFETCH(); } while (0) + +#define SegBase(Seg) (Sreg(Seg) << 4) + +#define DefaultBase(Seg) ((nec_state->seg_prefix && (Seg==DS0 || Seg==SS)) ? nec_state->prefix_base : Sreg(Seg) << 4) + +#define GetMemB(Seg,Off) (read_mem_byte(DefaultBase(Seg) + (Off))) +#define GetMemW(Seg,Off) (read_mem_word(DefaultBase(Seg) + (Off))) + +#define PutMemB(Seg,Off,x) { write_mem_byte(DefaultBase(Seg) + (Off), (x)); } +#define PutMemW(Seg,Off,x) { write_mem_word(DefaultBase(Seg) + (Off), (x)); } + +/* prefetch timing */ + +#define FETCH() fetch(nec_state) +#define FETCHWORD() fetchword(nec_state) +#define EMPTY_PREFETCH() nec_state->prefetch_reset = 1 + + +#define PUSH(val) { Wreg(SP) -= 2; write_mem_word(((Sreg(SS)<<4)+Wreg(SP)), val); } +#define POP(var) { Wreg(SP) += 2; var = read_mem_word(((Sreg(SS)<<4) + ((Wreg(SP)-2) & 0xffff))); } + +#define GetModRM UINT32 ModRM=FETCH() + +/* Cycle count macros: + CLK - cycle count is the same on all processors + CLKS - cycle count differs between processors, list all counts + CLKW - cycle count for word read/write differs for odd/even source/destination address + CLKM - cycle count for reg/mem instructions + CLKR - cycle count for reg/mem instructions with different counts for odd/even addresses + + + Prefetch & buswait time is not emulated. + Extra cycles for PUSH'ing or POP'ing registers to odd addresses is not emulated. +*/ + +#define CLK(all) nec_state->icount-=all +#define CLKS(v20,v30,v33) { const UINT32 ccount=(v20<<16)|(v30<<8)|v33; nec_state->icount-=(ccount>>nec_state->chip_type)&0x7f; } +#define CLKW(v20o,v30o,v33o,v20e,v30e,v33e,addr) { const UINT32 ocount=(v20o<<16)|(v30o<<8)|v33o, ecount=(v20e<<16)|(v30e<<8)|v33e; nec_state->icount-=(addr&1)?((ocount>>nec_state->chip_type)&0x7f):((ecount>>nec_state->chip_type)&0x7f); } +#define CLKM(v20,v30,v33,v20m,v30m,v33m) { const UINT32 ccount=(v20<<16)|(v30<<8)|v33, mcount=(v20m<<16)|(v30m<<8)|v33m; nec_state->icount-=( ModRM >=0xc0 )?((ccount>>nec_state->chip_type)&0x7f):((mcount>>nec_state->chip_type)&0x7f); } +#define CLKR(v20o,v30o,v33o,v20e,v30e,v33e,vall,addr) { const UINT32 ocount=(v20o<<16)|(v30o<<8)|v33o, ecount=(v20e<<16)|(v30e<<8)|v33e; if (ModRM >=0xc0) nec_state->icount-=vall; else nec_state->icount-=(addr&1)?((ocount>>nec_state->chip_type)&0x7f):((ecount>>nec_state->chip_type)&0x7f); } + +/************************************************************************/ +#define CompressFlags() (WORD)(int(CF) | 0x02 | (int(PF) << 2) | (int(AF) << 4) | (int(ZF) << 6) \ + | (int(SF) << 7) | (nec_state->TF << 8) | (nec_state->IF << 9) \ + | (nec_state->DF << 10) | (int(OF) << 11) | 0x7000 | (nec_state->MF << 15)) + +#define ExpandFlags(f) \ +{ \ + nec_state->CarryVal = (f) & 0x0001; \ + nec_state->ParityVal = !((f) & 0x0004); \ + nec_state->AuxVal = (f) & 0x0010; \ + nec_state->ZeroVal = !((f) & 0x0040); \ + nec_state->SignVal = (f) & 0x0080 ? -1 : 0; \ + nec_state->TF = ((f) & 0x0100) == 0x0100; \ + nec_state->IF = ((f) & 0x0200) == 0x0200; \ + nec_state->DF = ((f) & 0x0400) == 0x0400; \ + nec_state->OverVal = (f) & 0x0800; \ + nec_state->MF = ((f) & 0x8000) == 0x8000; \ +} |