trunk/src/emu/cpu/z80/z80.c
| r17601 | r17602 | |
|---|
| 366 | 366 | |
| 367 | 367 | static void take_interrupt(z80_state *z80); |
| 368 | 368 | static void take_interrupt_nsc800(z80_state *z80); |
| 369 | | static CPU_BURN( z80 ); |
| 370 | 369 | |
| 371 | 370 | typedef void (*funcptr)(z80_state *z80); |
| 372 | 371 | |
| r17601 | r17602 | |
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| 477 | 476 | PROTOTYPES(Z80fd,fd); |
| 478 | 477 | PROTOTYPES(Z80xycb,xycb); |
| 479 | 478 | |
| 480 | | /****************************************************************************/ |
| 481 | | /* Burn an odd amount of cycles, that is instructions taking something */ |
| 482 | | /* different from 4 T-states per opcode (and r increment) */ |
| 483 | | /****************************************************************************/ |
| 484 | | INLINE void BURNODD(z80_state *z80, int cycles, int opcodes, int cyclesum) |
| 485 | | { |
| 486 | | if( cycles > 0 ) |
| 487 | | { |
| 488 | | z80->r += (cycles / cyclesum) * opcodes; |
| 489 | | z80->icount -= (cycles / cyclesum) * cyclesum; |
| 490 | | } |
| 491 | | } |
| 492 | | |
| 493 | 479 | /*************************************************************** |
| 494 | 480 | * define an opcode function |
| 495 | 481 | ***************************************************************/ |
| r17601 | r17602 | |
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| 594 | 580 | #define ENTER_HALT(Z) do { \ |
| 595 | 581 | (Z)->PC--; \ |
| 596 | 582 | (Z)->halt = 1; \ |
| 597 | | if( (Z)->irq_state == CLEAR_LINE ) \ |
| 598 | | CPU_BURN_NAME(z80)( (Z)->device, (Z)->icount); \ |
| 599 | 583 | } while (0) |
| 600 | 584 | |
| 601 | 585 | /*************************************************************** |
| r17601 | r17602 | |
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| 3687 | 3671 | } |
| 3688 | 3672 | |
| 3689 | 3673 | /**************************************************************************** |
| 3690 | | * Burn 'cycles' T-states. Adjust z80->r register for the lost time |
| 3691 | | ****************************************************************************/ |
| 3692 | | static CPU_BURN( z80 ) |
| 3693 | | { |
| 3694 | | z80_state *z80 = get_safe_token(device); |
| 3695 | | |
| 3696 | | if( cycles > 0 ) |
| 3697 | | { |
| 3698 | | /* NOP takes 4 cycles per instruction */ |
| 3699 | | int n = (cycles + 3) / 4; |
| 3700 | | z80->r += n; |
| 3701 | | z80->icount -= 4 * n; |
| 3702 | | } |
| 3703 | | } |
| 3704 | | |
| 3705 | | /**************************************************************************** |
| 3706 | 3674 | * Set IRQ line state |
| 3707 | 3675 | ****************************************************************************/ |
| 3708 | 3676 | static void set_irq_line(z80_state *z80, int irqline, int state) |