111 lines
2.5 KiB
C++
111 lines
2.5 KiB
C++
/*====================================================================
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filename: gdsp_memory.cpp
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project: GCemu
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created: 2004-6-18
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mail: duddie@walla.com
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Copyright (c) 2005 Duddie & Tratax
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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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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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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 <stdio.h>
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#include "Globals.h"
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#include "gdsp_interpreter.h"
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#include "gdsp_memory.h"
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#include "gdsp_interface.h"
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u16 dsp_swap16(u16 x)
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{
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return (x >> 8) | (x << 8);
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}
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u16 dsp_imem_read(u16 addr)
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{
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switch (addr >> 12)
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{
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case 0:
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return dsp_swap16(g_dsp.iram[addr & DSP_IRAM_MASK]);
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case 8:
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return dsp_swap16(g_dsp.irom[addr & DSP_IROM_MASK]);
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default:
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ERROR_LOG(DSPLLE, "%04x DSP ERROR: Executing from invalid (%04x) memory", g_dsp.pc, addr);
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return 0;
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}
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}
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u16 dsp_dmem_read(u16 addr)
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{
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switch (addr >> 12)
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{
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case 0x0: // 0xxx DRAM
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return dsp_swap16(g_dsp.dram[addr & DSP_DRAM_MASK]);
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case 0x1: // 1xxx COEF
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return dsp_swap16(g_dsp.coef[addr & DSP_COEF_MASK]);
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// FIXME: unknown addresses used by zelda
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/* case 0x2:
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case 0x3:
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case 0x4:
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break;*/
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case 0xf: // Fxxx HW regs
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return gdsp_ifx_read(addr);
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default: // error
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ERROR_LOG(DSPLLE, "%04x DSP ERROR: Read from UNKNOWN (%04x) memory", g_dsp.pc, addr);
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return 0;
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}
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}
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void dsp_dmem_write(u16 addr, u16 val)
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{
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switch (addr >> 12)
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{
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case 0x0: // 0xxx DRAM
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g_dsp.dram[addr & DSP_DRAM_MASK] = dsp_swap16(val);
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break;
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case 0x1: // 1xxx COEF
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ERROR_LOG(DSPLLE, "someone writes to COEF");
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break;
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case 0xf: // Fxxx HW regs
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gdsp_ifx_write(addr, val);
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break;
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default: // error
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ERROR_LOG(DSPLLE, "%04x DSP ERROR: Write to UNKNOWN (%04x) memory", g_dsp.pc, addr);
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break;
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}
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}
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u16 dsp_fetch_code()
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{
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u16 opc = dsp_imem_read(g_dsp.pc);
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g_dsp.pc++;
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return opc;
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}
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u16 dsp_peek_code()
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{
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return dsp_imem_read(g_dsp.pc);
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}
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