diff options
Diffstat (limited to 'src/sa1.cpp')
| -rw-r--r-- | src/sa1.cpp | 775 |
1 files changed, 0 insertions, 775 deletions
diff --git a/src/sa1.cpp b/src/sa1.cpp deleted file mode 100644 index 73b1fa4..0000000 --- a/src/sa1.cpp +++ /dev/null @@ -1,775 +0,0 @@ -/*
- * Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
- *
- * (c) Copyright 1996 - 2001 Gary Henderson (gary.henderson@ntlworld.com) and
- * Jerremy Koot (jkoot@snes9x.com)
- *
- * Super FX C emulator code
- * (c) Copyright 1997 - 1999 Ivar (ivar@snes9x.com) and
- * Gary Henderson.
- * Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_.
- *
- * DSP1 emulator code (c) Copyright 1998 Ivar, _Demo_ and Gary Henderson.
- * C4 asm and some C emulation code (c) Copyright 2000 zsKnight and _Demo_.
- * C4 C code (c) Copyright 2001 Gary Henderson (gary.henderson@ntlworld.com).
- *
- * DOS port code contains the works of other authors. See headers in
- * individual files.
- *
- * Snes9x homepage: http://www.snes9x.com
- *
- * Permission to use, copy, modify and distribute Snes9x in both binary and
- * source form, for non-commercial purposes, is hereby granted without fee,
- * providing that this license information and copyright notice appear with
- * all copies and any derived work.
- *
- * This software is provided 'as-is', without any express or implied
- * warranty. In no event shall the authors be held liable for any damages
- * arising from the use of this software.
- *
- * Snes9x is freeware for PERSONAL USE only. Commercial users should
- * seek permission of the copyright holders first. Commercial use includes
- * charging money for Snes9x or software derived from Snes9x.
- *
- * The copyright holders request that bug fixes and improvements to the code
- * should be forwarded to them so everyone can benefit from the modifications
- * in future versions.
- *
- * Super NES and Super Nintendo Entertainment System are trademarks of
- * Nintendo Co., Limited and its subsidiary companies.
- */
-
-#ifdef USE_SA1
-
-#include "snes9x.h"
-#include "ppu.h"
-#include "cpuexec.h"
-
-#include "sa1.h"
-
-static void S9xSA1CharConv2 ();
-static void S9xSA1DMA ();
-static void S9xSA1ReadVariableLengthData (bool8 inc, bool8 no_shift);
-
-void S9xSA1Init ()
-{
- SA1.NMIActive = FALSE;
- SA1.IRQActive = FALSE;
- SA1.WaitingForInterrupt = FALSE;
- SA1.Waiting = FALSE;
- SA1.Flags = 0;
- SA1.Executing = FALSE;
- memset (&Memory.FillRAM [0x2200], 0, 0x200);
- Memory.FillRAM [0x2200] = 0x20;
- Memory.FillRAM [0x2220] = 0x00;
- Memory.FillRAM [0x2221] = 0x01;
- Memory.FillRAM [0x2222] = 0x02;
- Memory.FillRAM [0x2223] = 0x03;
- Memory.FillRAM [0x2228] = 0xff;
- SA1.op1 = 0;
- SA1.op2 = 0;
- SA1.arithmetic_op = 0;
- SA1.sum = 0;
- SA1.overflow = FALSE;
-}
-
-void S9xSA1Reset ()
-{
- SA1Registers.PB = 0;
- SA1Registers.PC = Memory.FillRAM [0x2203] |
- (Memory.FillRAM [0x2204] << 8);
- SA1Registers.D.W = 0;
- SA1Registers.DB = 0;
- SA1Registers.SH = 1;
- SA1Registers.SL = 0xFF;
- SA1Registers.XH = 0;
- SA1Registers.YH = 0;
- SA1Registers.P.W = 0;
-
- SA1.ShiftedPB = 0;
- SA1.ShiftedDB = 0;
- SA1SetFlags (MemoryFlag | IndexFlag | IRQ | Emulation);
- SA1ClearFlags (Decimal);
-
- SA1.WaitingForInterrupt = FALSE;
- SA1.PC = NULL;
- SA1.PCBase = NULL;
- S9xSA1SetPCBase (SA1Registers.PC);
- SA1.S9xOpcodes = S9xSA1OpcodesM1X1;
-
- S9xSA1UnpackStatus();
- S9xSA1FixCycles ();
- SA1.Executing = TRUE;
- SA1.BWRAM = Memory.SRAM;
- Memory.FillRAM [0x2225] = 0;
-}
-
-void S9xSA1SetBWRAMMemMap (uint8 val)
-{
- int c;
-
- if (val & 0x80)
- {
- for (c = 0; c < 0x400; c += 16)
- {
- SA1_Map [c + 6] = SA1_Map [c + 0x806] = (uint8 *) CMemory::MAP_BWRAM_BITMAP2;
- SA1_Map [c + 7] = SA1_Map [c + 0x807] = (uint8 *) CMemory::MAP_BWRAM_BITMAP2;
- SA1_WriteMap [c + 6] = SA1_WriteMap [c + 0x806] = (uint8 *) CMemory::MAP_BWRAM_BITMAP2;
- SA1_WriteMap [c + 7] = SA1_WriteMap [c + 0x807] = (uint8 *) CMemory::MAP_BWRAM_BITMAP2;
- }
- SA1.BWRAM = Memory.SRAM + (val & 0x7f) * 0x2000 / 4;
- }
- else
- {
- for (c = 0; c < 0x400; c += 16)
- {
- SA1_Map [c + 6] = SA1_Map [c + 0x806] = (uint8 *) CMemory::MAP_BWRAM;
- SA1_Map [c + 7] = SA1_Map [c + 0x807] = (uint8 *) CMemory::MAP_BWRAM;
- SA1_WriteMap [c + 6] = SA1_WriteMap [c + 0x806] = (uint8 *) CMemory::MAP_BWRAM;
- SA1_WriteMap [c + 7] = SA1_WriteMap [c + 0x807] = (uint8 *) CMemory::MAP_BWRAM;
- }
- SA1.BWRAM = Memory.SRAM + (val & 7) * 0x2000;
- }
-}
-
-void S9xFixSA1AfterSnapshotLoad ()
-{
- SA1.ShiftedPB = (uint32) SA1Registers.PB << 16;
- SA1.ShiftedDB = (uint32) SA1Registers.DB << 16;
-
- S9xSA1SetPCBase (SA1.ShiftedPB + SA1Registers.PC);
- S9xSA1UnpackStatus ();
- S9xSA1FixCycles ();
- SA1.VirtualBitmapFormat = (Memory.FillRAM [0x223f] & 0x80) ? 2 : 4;
- Memory.BWRAM = Memory.SRAM + (Memory.FillRAM [0x2224] & 7) * 0x2000;
- S9xSA1SetBWRAMMemMap (Memory.FillRAM [0x2225]);
-
- SA1.Waiting = (Memory.FillRAM [0x2200] & 0x60) != 0;
- SA1.Executing = !SA1.Waiting;
-}
-
-// SA9xSA1GetByte --- begin
-static uint8 S9xSA1GetByte_default (uint32 address) {
-#ifdef DEBUGGER
-// printf ("R(B) %06x\n", address);
-#endif
- return (0);
-}
-static uint8 S9xSA1GetByte_PPU (uint32 address) {
- return (S9xGetSA1 (address & 0xffff));
-}
-static uint8 S9xSA1GetByte_SA1RAM (uint32 address) {
- return (*(Memory.SRAM + (address & 0xffff)));
-}
-static uint8 S9xSA1GetByte_BWRAM (uint32 address) {
- return (*(SA1.BWRAM + ((address & 0x7fff) - 0x6000)));
-}
-static uint8 S9xSA1GetByte_BWRAM_BITMAP (uint32 address) {
- address -= 0x600000;
- if (SA1.VirtualBitmapFormat == 2)
- return ((Memory.SRAM [(address >> 2) & 0xffff] >> ((address & 3) << 1)) & 3);
- else
- return ((Memory.SRAM [(address >> 1) & 0xffff] >> ((address & 1) << 2)) & 15);
-}
-static uint8 S9xSA1GetByte_BWRAM_BITMAP2 (uint32 address) {
- address = (address & 0xffff) - 0x6000;
- if (SA1.VirtualBitmapFormat == 2)
- return ((SA1.BWRAM [(address >> 2) & 0xffff] >> ((address & 3) << 1)) & 3);
- else
- return ((SA1.BWRAM [(address >> 1) & 0xffff] >> ((address & 1) << 2)) & 15);
-}
-
-// GetByte JumpTable for Memmory map modes
-uint8 (*S9xSA1GetByte_JumpTable[(1 << (16 - 12))]) (uint32 address) = {
- S9xSA1GetByte_PPU, // MAP_PPU
- S9xSA1GetByte_default, // MAP_CPU
- S9xSA1GetByte_default, // MAP_DSP
- S9xSA1GetByte_SA1RAM, // MAP_LOROM_SRAM
- S9xSA1GetByte_default, // MAP_HIROM_SRAM
- S9xSA1GetByte_default, // MAP_NONE
- S9xSA1GetByte_default, // MAP_DEBUG
- S9xSA1GetByte_default, // MAP_C4
- S9xSA1GetByte_BWRAM, // MAP_BWRAM
- S9xSA1GetByte_BWRAM_BITMAP, // MAP_BWRAM_BITMAP
- S9xSA1GetByte_BWRAM_BITMAP2, // MAP_BWRAM_BITMAP2
- S9xSA1GetByte_SA1RAM, // MAP_SA1RAM
- S9xSA1GetByte_default, // MAP_LAST
- S9xSA1GetByte_default, // MAP_LAST+1
- S9xSA1GetByte_default, // MAP_LAST+2
- S9xSA1GetByte_default // MAP_LAST+3
-};
-
-uint8 S9xSA1GetByte (uint32 address)
-{
- uint8 *GetAddress = SA1_Map [(address >> MEMMAP_SHIFT) & MEMMAP_MASK];
- if (GetAddress >= (uint8 *) CMemory::MAP_LAST) return (*(GetAddress + (address & 0xffff)));
- return S9xSA1GetByte_JumpTable[(intptr_t) GetAddress](address);
-// return (SA1_Map [(address >> MEMMAP_SHIFT) & MEMMAP_MASK] >= (uint8 *)CMemory::MAP_LAST) ?
-// (*((uint8 *)(SA1_Map [(address >> MEMMAP_SHIFT) & MEMMAP_MASK]) + (address & 0xffff))) :
-// S9xSA1GetByte_JumpTable[(int) SA1_Map [(address >> MEMMAP_SHIFT) & MEMMAP_MASK]](address);
-}
-
-/*
-uint16 S9xSA1GetWord (uint32 address)
-{
- uint8 *GetAddress = SA1_Map [(address >> MEMMAP_SHIFT) & MEMMAP_MASK];
- if (GetAddress >= (uint8 *) CMemory::MAP_LAST)
- return (*(GetAddress + (address & 0xffff))) | ((*(GetAddress + ((address+1) & 0xffff))) << 8);
- return (S9xSA1GetByte_JumpTable[(int) GetAddress](address)) | ((S9xSA1GetByte_JumpTable[(int) GetAddress](address+1)) << 8);
-}
-*/
-// SA9xSA1SetByte --- begin
-static void S9xSA1SetByte_default (uint8 byte, uint32 address) {
-}
-static void S9xSA1SetByte_PPU (uint8 byte, uint32 address) {
- S9xSetSA1 (byte, address & 0xffff);
-}
-static void S9xSA1SetByte_SA1RAM (uint8 byte, uint32 address) {
- *(Memory.SRAM + (address & 0xffff)) = byte;
-}
-static void S9xSA1SetByte_BWRAM (uint8 byte, uint32 address) {
- *(SA1.BWRAM + ((address & 0x7fff) - 0x6000)) = byte;
-}
-static void S9xSA1SetByte_BWRAM_BITMAP (uint8 byte, uint32 address) {
- uint8 *ptr;
- address -= 0x600000;
- if (SA1.VirtualBitmapFormat == 2) {
- ptr = &Memory.SRAM [(address >> 2) & 0xffff];
- *ptr &= ~(3 << ((address & 3) << 1));
- *ptr |= (byte & 3) << ((address & 3) << 1);
- } else {
- ptr = &Memory.SRAM [(address >> 1) & 0xffff];
- *ptr &= ~(15 << ((address & 1) << 2));
- *ptr |= (byte & 15) << ((address & 1) << 2);
- }
- address -= 0x600000;
-}
-static void S9xSA1SetByte_BWRAM_BITMAP2 (uint8 byte, uint32 address) {
- uint8 *ptr;
- address = (address & 0xffff) - 0x6000;
- if (SA1.VirtualBitmapFormat == 2)
- {
- ptr = &SA1.BWRAM [(address >> 2) & 0xffff];
- *ptr &= ~(3 << ((address & 3) << 1));
- *ptr |= (byte & 3) << ((address & 3) << 1);
- }
- else
- {
- ptr = &SA1.BWRAM [(address >> 1) & 0xffff];
- *ptr &= ~(15 << ((address & 1) << 2));
- *ptr |= (byte & 15) << ((address & 1) << 2);
- }
-}
-
-// SetByte JumpTable for Memmory map modes
-void (*S9xSA1SetByte_JumpTable[(1 << (16 - 12))]) (uint8 byte, uint32 address) = {
- S9xSA1SetByte_PPU, // MAP_PPU
- S9xSA1SetByte_default, // MAP_CPU
- S9xSA1SetByte_default, // MAP_DSP
- S9xSA1SetByte_SA1RAM, // MAP_LOROM_SRAM
- S9xSA1SetByte_default, // MAP_HIROM_SRAM
- S9xSA1SetByte_default, // MAP_NONE
- S9xSA1SetByte_default, // MAP_DEBUG
- S9xSA1SetByte_default, // MAP_C4
- S9xSA1SetByte_BWRAM, // MAP_BWRAM
- S9xSA1SetByte_BWRAM_BITMAP, // MAP_BWRAM_BITMAP
- S9xSA1SetByte_BWRAM_BITMAP2, // MAP_BWRAM_BITMAP2
- S9xSA1SetByte_SA1RAM, // MAP_SA1RAM
- S9xSA1SetByte_default, // MAP_LAST
- S9xSA1SetByte_default, // MAP_LAST+1
- S9xSA1SetByte_default, // MAP_LAST+2
- S9xSA1SetByte_default // MAP_LAST+3
-};
-
-void S9xSA1SetByte (uint8 byte, uint32 address)
-{
- // MEMMAP_SHIFT 12
- // MEMMAP_MASK 0xFFF
-
- uint8 *Setaddress = SA1_WriteMap [(address >> MEMMAP_SHIFT) & MEMMAP_MASK];
- if (Setaddress >= (uint8 *) CMemory::MAP_LAST)
- {
- *(Setaddress + (address & 0xffff)) = byte;
- return;
- }
- S9xSA1SetByte_JumpTable[(intptr_t)Setaddress](byte, address);
-}
-
-void S9xSA1SetPCBase (uint32 address)
-{
- uint8 *GetAddress = SA1_Map [(address >> MEMMAP_SHIFT) & MEMMAP_MASK];
- if (GetAddress >= (uint8 *) CMemory::MAP_LAST)
- {
- SA1.PCBase = GetAddress;
- SA1.PC = GetAddress + (address & 0xffff);
- return;
- }
-
- switch ((intptr_t) GetAddress)
- {
- case CMemory::MAP_PPU:
- SA1.PCBase = Memory.FillRAM - 0x2000;
- SA1.PC = SA1.PCBase + (address & 0xffff);
- return;
-
- case CMemory::MAP_CPU:
- SA1.PCBase = Memory.FillRAM - 0x4000;
- SA1.PC = SA1.PCBase + (address & 0xffff);
- return;
-
- case CMemory::MAP_DSP:
- SA1.PCBase = Memory.FillRAM - 0x6000;
- SA1.PC = SA1.PCBase + (address & 0xffff);
- return;
-
- case CMemory::MAP_SA1RAM:
- case CMemory::MAP_LOROM_SRAM:
- SA1.PCBase = Memory.SRAM;
- SA1.PC = SA1.PCBase + (address & 0xffff);
- return;
-
- case CMemory::MAP_BWRAM:
- SA1.PCBase = SA1.BWRAM - 0x6000;
- SA1.PC = SA1.PCBase + (address & 0xffff);
- return;
- case CMemory::MAP_HIROM_SRAM:
- SA1.PCBase = Memory.SRAM - 0x6000;
- SA1.PC = SA1.PCBase + (address & 0xffff);
- return;
-
- case CMemory::MAP_DEBUG:
-#ifdef DEBUGGER
- printf ("SBP %06x\n", address);
-#endif
-
- default:
- case CMemory::MAP_NONE:
- SA1.PCBase = Memory.RAM;
- SA1.PC = Memory.RAM + (address & 0xffff);
- return;
- }
-}
-
-void S9xSA1ExecuteDuringSleep ()
-{
-}
-
-void S9xSetSA1MemMap (uint32 which1, uint8 map)
-{
- int c;
- int start = which1 * 0x100 + 0xc00;
- int start2 = which1 * 0x200;
- uint8 *block;
- int i;
-
- if (which1 >= 2)
- start2 += 0x400;
-
- for (c = 0; c < 0x100; c += 16)
- {
- block = &Memory.ROM [(map & 7) * 0x100000 + (c << 12)];
- for (i = c; i < c + 16; i++)
- Memory.Map [start + i] = SA1_Map [start + i] = block;
- }
-
- for (c = 0; c < 0x200; c += 16)
- {
- block = &Memory.ROM [(map & 7) * 0x100000 + (c << 11) - 0x8000];
- for (i = c + 8; i < c + 16; i++)
- Memory.Map [start2 + i] = SA1_Map [start2 + i] = block;
- }
-}
-
-uint8 S9xGetSA1 (uint32 address)
-{
- if ((address < 0x2300) && (address > 0x230d)) return (Memory.FillRAM [address]);
- switch (address)
- {
- case 0x2300:
- return ((uint8) ((Memory.FillRAM [0x2209] & 0x5f) |
- (CPU.IRQActive & (SA1_IRQ_SOURCE | SA1_DMA_IRQ_SOURCE))));
- case 0x2301:
- return ((Memory.FillRAM [0x2200] & 0xf) |
- (Memory.FillRAM [0x2301] & 0xf0));
- case 0x2306:
- return ((uint8) SA1.sum);
- case 0x2307:
- return ((uint8) (SA1.sum >> 8));
- case 0x2308:
- return ((uint8) (SA1.sum >> 16));
- case 0x2309:
- return ((uint8) (SA1.sum >> 24));
- case 0x230a:
- return ((uint8) (SA1.sum >> 32));
- case 0x230b:
- return (Memory.FillRAM [address]);
- case 0x230c:
- return (Memory.FillRAM [0x230c]);
- case 0x230d:
- {
- uint8 byte = Memory.FillRAM [0x230d];
-
- if (Memory.FillRAM [0x2258] & 0x80)
- {
- S9xSA1ReadVariableLengthData (TRUE, FALSE);
- }
- return (byte);
- }
- }
-
-}
-
-void S9xSetSA1 (uint8 byte, uint32 address)
-{
-
- if (address < 0x2200 || address > 0x22ff) return;
-
- switch (address)
- {
- case 0x2200:
- SA1.Waiting = (byte & 0x60) != 0;
-
- if (!(byte & 0x20) && (Memory.FillRAM [0x2200] & 0x20))
- {
- S9xSA1Reset ();
- }
- if (byte & 0x80)
- {
- Memory.FillRAM [0x2301] |= 0x80;
- if (Memory.FillRAM [0x220a] & 0x80)
- {
- SA1.Flags |= IRQ_PENDING_FLAG;
- SA1.IRQActive |= SNES_IRQ_SOURCE;
- SA1.Executing = !SA1.Waiting && SA1.S9xOpcodes;
- }
- }
- if (byte & 0x10)
- {
- Memory.FillRAM [0x2301] |= 0x10;
- }
- break;
-
- case 0x2201:
- if (((byte ^ Memory.FillRAM [0x2201]) & 0x80) &&
- (Memory.FillRAM [0x2300] & byte & 0x80))
- {
- S9xSetIRQ (SA1_IRQ_SOURCE);
- }
- if (((byte ^ Memory.FillRAM [0x2201]) & 0x20) &&
- (Memory.FillRAM [0x2300] & byte & 0x20))
- {
- S9xSetIRQ (SA1_DMA_IRQ_SOURCE);
- }
- break;
- case 0x2202:
- if (byte & 0x80)
- {
- Memory.FillRAM [0x2300] &= ~0x80;
- S9xClearIRQ (SA1_IRQ_SOURCE);
- }
- if (byte & 0x20)
- {
- Memory.FillRAM [0x2300] &= ~0x20;
- S9xClearIRQ (SA1_DMA_IRQ_SOURCE);
- }
- break;
-
- case 0x2209:
- Memory.FillRAM [0x2209] = byte;
- if (byte & 0x80)
- Memory.FillRAM [0x2300] |= 0x80;
-
- if (byte & Memory.FillRAM [0x2201] & 0x80)
- {
- S9xSetIRQ (SA1_IRQ_SOURCE);
- }
- return;
- case 0x220a:
- if (((byte ^ Memory.FillRAM [0x220a]) & 0x80) &&
- (Memory.FillRAM [0x2301] & byte & 0x80))
- {
- SA1.Flags |= IRQ_PENDING_FLAG;
- SA1.IRQActive |= SNES_IRQ_SOURCE;
- }
- if (((byte ^ Memory.FillRAM [0x220a]) & 0x40) &&
- (Memory.FillRAM [0x2301] & byte & 0x40))
- {
- SA1.Flags |= IRQ_PENDING_FLAG;
- SA1.IRQActive |= TIMER_IRQ_SOURCE;
- }
- if (((byte ^ Memory.FillRAM [0x220a]) & 0x20) &&
- (Memory.FillRAM [0x2301] & byte & 0x20))
- {
- SA1.Flags |= IRQ_PENDING_FLAG;
- SA1.IRQActive |= DMA_IRQ_SOURCE;
- }
- if (((byte ^ Memory.FillRAM [0x220a]) & 0x10) &&
- (Memory.FillRAM [0x2301] & byte & 0x10))
- {
- }
- break;
- case 0x220b:
- if (byte & 0x80)
- {
- SA1.IRQActive &= ~SNES_IRQ_SOURCE;
- Memory.FillRAM [0x2301] &= ~0x80;
- }
- if (byte & 0x40)
- {
- SA1.IRQActive &= ~TIMER_IRQ_SOURCE;
- Memory.FillRAM [0x2301] &= ~0x40;
- }
- if (byte & 0x20)
- {
- SA1.IRQActive &= ~DMA_IRQ_SOURCE;
- Memory.FillRAM [0x2301] &= ~0x20;
- }
- if (byte & 0x10)
- {
- // Clear NMI
- Memory.FillRAM [0x2301] &= ~0x10;
- }
- if (!SA1.IRQActive)
- SA1.Flags &= ~IRQ_PENDING_FLAG;
- break;
- case 0x2220:
- case 0x2221:
- case 0x2222:
- case 0x2223:
- S9xSetSA1MemMap (address - 0x2220, byte);
- break;
- case 0x2224:
- Memory.BWRAM = Memory.SRAM + (byte & 7) * 0x2000;
- break;
- case 0x2225:
- if (byte != Memory.FillRAM [address])
- S9xSA1SetBWRAMMemMap (byte);
- break;
- case 0x2231:
- if (byte & 0x80)
- SA1.in_char_dma = FALSE;
- break;
- case 0x2236:
- Memory.FillRAM [address] = byte;
- if ((Memory.FillRAM [0x2230] & 0xa4) == 0x80)
- {
- // Normal DMA to I-RAM
- S9xSA1DMA ();
- }
- else
- if ((Memory.FillRAM [0x2230] & 0xb0) == 0xb0)
- {
- Memory.FillRAM [0x2300] |= 0x20;
- if (Memory.FillRAM [0x2201] & 0x20)
- S9xSetIRQ (SA1_DMA_IRQ_SOURCE);
- SA1.in_char_dma = TRUE;
- }
- return;
- case 0x2237:
- Memory.FillRAM [address] = byte;
- if ((Memory.FillRAM [0x2230] & 0xa4) == 0x84)
- {
- // Normal DMA to BW-RAM
- S9xSA1DMA ();
- }
- return;
- case 0x223f:
- SA1.VirtualBitmapFormat = (byte & 0x80) ? 2 : 4;
- break;
-
- case 0x224f:
- Memory.FillRAM [address] = byte;
- if ((Memory.FillRAM [0x2230] & 0xb0) == 0xa0)
- {
- // Char conversion 2 DMA enabled
- memmove (&Memory.ROM [CMemory::MAX_ROM_SIZE - 0x10000] + (SA1.in_char_dma << 4),
- &Memory.FillRAM [0x2240], 16);
- SA1.in_char_dma = (SA1.in_char_dma + 1) & 7;
- if ((SA1.in_char_dma & 3) == 0)
- {
- S9xSA1CharConv2 ();
- }
- }
- return;
- case 0x2250:
- if (byte & 2)
- SA1.sum = 0;
- SA1.arithmetic_op = byte & 3;
- break;
-
- case 0x2251:
- SA1.op1 = (SA1.op1 & 0xff00) | byte;
- break;
- case 0x2252:
- SA1.op1 = (SA1.op1 & 0xff) | (byte << 8);
- break;
- case 0x2253:
- SA1.op2 = (SA1.op2 & 0xff00) | byte;
- break;
- case 0x2254:
- SA1.op2 = (SA1.op2 & 0xff) | (byte << 8);
- switch (SA1.arithmetic_op)
- {
- case 0: // multiply
- SA1.sum = SA1.op1 * SA1.op2;
- break;
- case 1: // divide
- if (SA1.op2 == 0)
- SA1.sum = SA1.op1 << 16;
- else
- {
- unsigned int x = (SA1.op1 / (int) ((uint16) SA1.op2));
- SA1.sum = x | ((SA1.op1 - (x * (uint16) SA1.op2)) << 16);
- // SA1.sum = (SA1.op1 / (int) ((uint16) SA1.op2)) |
- //((SA1.op1 % (int) ((uint16) SA1.op2)) << 16);
- }
- break;
- default: // cumulative sum
- SA1.sum += SA1.op1 * SA1.op2;
- if (SA1.sum & ((int64) 0xffffff << 32))
- SA1.overflow = TRUE;
- break;
- }
- break;
- case 0x2258: // Variable bit-field length/auto inc/start.
- Memory.FillRAM [0x2258] = byte;
- S9xSA1ReadVariableLengthData (TRUE, FALSE);
- return;
- case 0x2259:
- case 0x225a:
- case 0x225b: // Variable bit-field start address
- Memory.FillRAM [address] = byte;
- // XXX: ???
- SA1.variable_bit_pos = 0;
- S9xSA1ReadVariableLengthData (FALSE, TRUE);
- return;
- }
- if (address >= 0x2200 && address <= 0x22ff)
- Memory.FillRAM [address] = byte;
-}
-
-static void S9xSA1CharConv2 ()
-{
- uint32 dest = Memory.FillRAM [0x2235] | (Memory.FillRAM [0x2236] << 8);
- uint32 offset = (SA1.in_char_dma & 7) ? 0 : 1;
- int depth = (Memory.FillRAM [0x2231] & 3) == 0 ? 8 :
- (Memory.FillRAM [0x2231] & 3) == 1 ? 4 : 2;
- int bytes_per_char = 8 * depth;
- uint8 *p = &Memory.FillRAM [0x3000] + dest + offset * bytes_per_char;
- uint8 *q = &Memory.ROM [CMemory::MAX_ROM_SIZE - 0x10000] + offset * 64;
-
- if (depth == 8)
- {
- for (int l = 0; l < 8; l++, q += 8)
- {
- for (int b = 0; b < 8; b++)
- {
- uint8 r = *(q + b);
- *(p + 0) = (*(p + 0) << 1) | ((r >> 0) & 1);
- *(p + 1) = (*(p + 1) << 1) | ((r >> 1) & 1);
- *(p + 16) = (*(p + 16) << 1) | ((r >> 2) & 1);
- *(p + 17) = (*(p + 17) << 1) | ((r >> 3) & 1);
- *(p + 32) = (*(p + 32) << 1) | ((r >> 4) & 1);
- *(p + 33) = (*(p + 33) << 1) | ((r >> 5) & 1);
- *(p + 48) = (*(p + 48) << 1) | ((r >> 6) & 1);
- *(p + 49) = (*(p + 49) << 1) | ((r >> 7) & 1);
- }
- p += 2;
- }
- }
-}
-
-static void S9xSA1DMA ()
-{
- uint32 src = Memory.FillRAM [0x2232] |
- (Memory.FillRAM [0x2233] << 8) |
- (Memory.FillRAM [0x2234] << 16);
- uint32 dst = Memory.FillRAM [0x2235] |
- (Memory.FillRAM [0x2236] << 8) |
- (Memory.FillRAM [0x2237] << 16);
- uint32 len = Memory.FillRAM [0x2238] |
- (Memory.FillRAM [0x2239] << 8);
-
- uint8 *s;
- uint8 *d;
-
- switch (Memory.FillRAM [0x2230] & 3)
- {
- case 0: // ROM
- s = SA1_Map [(src >> MEMMAP_SHIFT) & MEMMAP_MASK];
- if (s >= (uint8 *) CMemory::MAP_LAST)
- s += (src & 0xffff);
- else
- s = Memory.ROM + (src & 0xffff);
- break;
- case 1: // BW-RAM
- src &= CPU.Memory_SRAMMask;
- len &= CPU.Memory_SRAMMask;
- s = Memory.SRAM + src;
- break;
- default:
- case 2:
- src &= 0x3ff;
- len &= 0x3ff;
- s = &Memory.FillRAM [0x3000] + src;
- break;
- }
-
- if (Memory.FillRAM [0x2230] & 4)
- {
- dst &= CPU.Memory_SRAMMask;
- len &= CPU.Memory_SRAMMask;
- d = Memory.SRAM + dst;
- }
- else
- {
- dst &= 0x3ff;
- len &= 0x3ff;
- d = &Memory.FillRAM [0x3000] + dst;
- }
- memmove (d, s, len);
- Memory.FillRAM [0x2301] |= 0x20;
-
- if (Memory.FillRAM [0x220a] & 0x20)
- {
- SA1.Flags |= IRQ_PENDING_FLAG;
- SA1.IRQActive |= DMA_IRQ_SOURCE;
- }
-}
-
-void S9xSA1ReadVariableLengthData (bool8 inc, bool8 no_shift)
-{
- uint32 addr = Memory.FillRAM [0x2259] |
- (Memory.FillRAM [0x225a] << 8) |
- (Memory.FillRAM [0x225b] << 16);
- uint8 shift = Memory.FillRAM [0x2258] & 15;
-
- if (no_shift)
- shift = 0;
- else
- if (shift == 0)
- shift = 16;
-
- uint8 s = shift + SA1.variable_bit_pos;
-
- if (s >= 16)
- {
- addr += (s >> 4) << 1;
- s &= 15;
- }
- uint32 data = S9xSA1GetWord (addr) |
- (S9xSA1GetWord (addr + 2) << 16);
-
- data >>= s;
- Memory.FillRAM [0x230c] = (uint8) data;
- Memory.FillRAM [0x230d] = (uint8) (data >> 8);
- if (inc)
- {
- SA1.variable_bit_pos = (SA1.variable_bit_pos + shift) & 15;
- Memory.FillRAM [0x2259] = (uint8) addr;
- Memory.FillRAM [0x225a] = (uint8) (addr >> 8);
- Memory.FillRAM [0x225b] = (uint8) (addr >> 16);
- }
-}
-
-#endif // USE_SA1
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