--- xmil/z80x/z80x_if.x86 2004/08/11 13:53:54 1.6 +++ xmil/z80x/z80x_if.x86 2005/02/04 06:42:14 1.9 @@ -12,19 +12,14 @@ section .text global _z80x_step extern _z80core - extern _z80dmap extern memfetch extern memrd16_ecx_ax extern memwr16_ecx_dx extern _cycles_main extern opcode_main - - align 16 -_z80x_ableinterrupt: - test byte [_z80core + R_Z80IFF], ((1 << IFF_IFLAG) | (1 << IFF_IRQ) | (1 << IFF_NMI)) - setz al - ret + extern _z80dmap + extern _dma align 16 @@ -35,7 +30,7 @@ _z80x_ableinterrupt: je short .setintr inc word [edx + R_Z80PC] and al, ~(1 << IFF_HALT) -.setintr: or al, ((1 << IFF_IRQ) | (1 << IFF_IFLAG)) +.setintr: or al, (1 << IFF_IFLAG) cmp byte [edx + R_Z80IM], 1 mov [edx + R_Z80IFF], al je short .im1 @@ -95,6 +90,8 @@ _z80x_nonmaskedinterrupt: _z80x_execute push ebx push edi mov edi, _z80core + test byte [_dma], 1 + jne short .dmalp .lp: inc byte [edi + R_Z80R] movzx ecx, word [edi + R_Z80PC] inc word [edi + R_Z80PC] @@ -102,13 +99,25 @@ _z80x_execute push ebx movzx edx, byte [_cycles_main + eax] Z80WORK edx call dword [opcode_main + eax*4] - call _z80dmap mov eax, [edi + z80core_t.remainclock] cmp eax, byte 0 jg short .lp - pop edi +.ed: pop edi pop ebx ret +.dmalp: inc byte [edi + R_Z80R] + movzx ecx, word [edi + R_Z80PC] + inc word [edi + R_Z80PC] + call memfetch + movzx edx, byte [_cycles_main + eax] + Z80WORK edx + call dword [opcode_main + eax*4] + call _z80dmap + mov eax, [edi + z80core_t.remainclock] + cmp eax, byte 0 + jg short .dmalp + jmp short .ed + align 16 _z80x_step: push ebx