mirror of
https://github.com/libretro/beetle-psx-libretro.git
synced 2024-11-24 01:09:51 +00:00
158 lines
3.0 KiB
C++
158 lines
3.0 KiB
C++
/* Mednafen - Multi-system Emulator
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "psx.h"
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static uint16_t Asserted;
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static uint16_t Mask;
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static uint16_t Status;
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#define Recalc() CPU->AssertIRQ(0, (bool)(Status & Mask))
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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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int IRQ_StateAction(void *data, int load, int data_only)
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{
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SFORMAT StateRegs[] =
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{
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SFVAR(Asserted),
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SFVAR(Mask),
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SFVAR(Status),
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SFEND
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};
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int ret = MDFNSS_StateAction(data, load, data_only, StateRegs, "IRQ");
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if(load)
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{
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Recalc();
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}
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return(ret);
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}
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void IRQ_Assert(int which, bool status)
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{
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uint32_t 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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void IRQ_Write(uint32_t A, uint32_t 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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uint32_t IRQ_Read(uint32_t A)
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{
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uint32_t ret = Status;
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if(A & 4)
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ret = Mask;
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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_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_t IRQ_GetRegister(unsigned int which, char *special, const uint32_t special_len)
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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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return Asserted;
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case IRQ_GSREG_STATUS:
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return Status;
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case IRQ_GSREG_MASK:
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return Mask;
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}
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return 0;
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}
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void IRQ_SetRegister(unsigned int which, uint32_t 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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break;
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case IRQ_GSREG_STATUS:
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Status = value;
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break;
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case IRQ_GSREG_MASK:
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Mask = value;
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break;
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default:
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return;
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}
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Recalc();
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}
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