171 lines
3.0 KiB
C++
171 lines
3.0 KiB
C++
/******************************************************************************/
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/* Mednafen Sony PS1 Emulation Module */
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/******************************************************************************/
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/* irq.cpp:
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** Copyright (C) 2011-2016 Mednafen Team
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of the GNU General Public License
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** as published by the Free Software Foundation; either version 2
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** of the License, or (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software Foundation, Inc.,
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** 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "psx.h"
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namespace MDFN_IEN_PSX
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{
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static uint16 Asserted;
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static uint16 Mask;
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static uint16 Status;
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static INLINE void Recalc(void)
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{
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CPU->AssertIRQ(0, (bool)(Status & Mask));
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}
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void IRQ_SyncState(bool isReader, EW::NewState *ns)
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{
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NSS(Asserted);
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NSS(Mask);
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NSS(Status);
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//as usual, not sure why this is necessary
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if(isReader)
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{
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Recalc();
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}
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}
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void IRQ_Assert(int which, bool status)
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{
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uint32 old_Asserted = Asserted;
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//PSX_WARNING("[IRQ] Assert: %d %d", which, status);
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//if(which == IRQ_SPU && status && (Asserted & (1 << which)))
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// MDFN_DispMessage("SPU IRQ glitch??");
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Asserted &= ~(1 << which);
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if(status)
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{
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Asserted |= 1 << which;
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//Status |= 1 << which;
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Status |= (old_Asserted ^ Asserted) & Asserted;
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}
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Recalc();
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}
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MDFN_FASTCALL void IRQ_Write(uint32 A, uint32 V)
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{
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// FIXME if we ever have "accurate" bus emulation
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V <<= (A & 3) * 8;
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//printf("[IRQ] Write: 0x%08x 0x%08x --- PAD TEMP\n", A, V);
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if(A & 4)
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Mask = V;
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else
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{
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Status &= V;
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//Status |= Asserted;
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}
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Recalc();
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}
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MDFN_FASTCALL uint32 IRQ_Read(uint32 A)
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{
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uint32 ret = 0;
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if(A & 4)
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ret = Mask;
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else
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ret = Status;
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// FIXME: Might want to move this out to psx.cpp eventually.
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ret |= 0x1F800000;
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ret >>= (A & 3) * 8;
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//printf("[IRQ] Read: 0x%08x 0x%08x --- PAD TEMP\n", A, ret);
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return(ret);
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}
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void IRQ_Power(void)
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{
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Asserted = 0;
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Status = 0;
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Mask = 0;
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Recalc();
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}
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void IRQ_Reset(void)
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{
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Asserted = 0;
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Status = 0;
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Mask = 0;
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Recalc();
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}
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uint32 IRQ_GetRegister(unsigned int which, char *special, const uint32 special_len)
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{
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uint32 ret = 0;
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switch(which)
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{
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case IRQ_GSREG_ASSERTED:
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ret = Asserted;
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break;
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case IRQ_GSREG_STATUS:
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ret = Status;
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break;
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case IRQ_GSREG_MASK:
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ret = Mask;
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break;
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}
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return(ret);
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}
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void IRQ_SetRegister(unsigned int which, uint32 value)
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{
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switch(which)
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{
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case IRQ_GSREG_ASSERTED:
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Asserted = value;
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Recalc();
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break;
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case IRQ_GSREG_STATUS:
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Status = value;
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Recalc();
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break;
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case IRQ_GSREG_MASK:
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Mask = value;
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Recalc();
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break;
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}
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}
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}
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