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/*====================================================================
filename: gdsp_interpreter.cpp
project: GCemu
created: 2004-6-18
mail: duddie@walla.com
Copyright (c) 2005 Duddie & Tratax
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
====================================================================*/
#include "Common.h"
#include "DSPCore.h"
#include "DSPAnalyzer.h"
#include "MemoryUtil.h"
#include "gdsp_interface.h"
#include "gdsp_registers.h"
#include "gdsp_opcodes_helper.h"
//namespace DSPCore
//{
SDSP g_dsp;
//-------------------------------------------------------------------------------
void gdsp_init()
{
g_dsp.irom = (u16*)AllocateMemoryPages(DSP_IROM_BYTE_SIZE);
g_dsp.iram = (u16*)AllocateMemoryPages(DSP_IRAM_BYTE_SIZE);
g_dsp.dram = (u16*)AllocateMemoryPages(DSP_DRAM_BYTE_SIZE);
g_dsp.coef = (u16*)AllocateMemoryPages(DSP_COEF_BYTE_SIZE);
// Fill roms with zeros.
memset(g_dsp.irom, 0, DSP_IROM_BYTE_SIZE);
memset(g_dsp.coef, 0, DSP_COEF_BYTE_SIZE);
for (int i = 0; i < 32; i++)
{
g_dsp.r[i] = 0;
}
for (int i = 0; i < 4; i++)
{
g_dsp.reg_stack_ptr[i] = 0;
for (int j = 0; j < DSP_STACK_DEPTH; j++)
{
g_dsp.reg_stack[i][j] = 0;
}
}
// Fill IRAM with HALT opcodes.
for (int i = 0; i < DSP_IRAM_SIZE; i++)
{
g_dsp.iram[i] = 0x0021; // HALT opcode
}
// Just zero out DRAM.
for (int i = 0; i < DSP_DRAM_SIZE; i++)
{
g_dsp.dram[i] = 0x2100;
}
// copied from a real console after the custom UCode has been loaded
g_dsp.r[0x08] = 0xffff;
g_dsp.r[0x09] = 0xffff;
g_dsp.r[0x0a] = 0xffff;
g_dsp.r[0x0b] = 0xffff;
g_dsp.cr = 0x804;
gdsp_ifx_init();
// Mostly keep IRAM write protected. We unprotect only when DMA-ing
// in new ucodes.
WriteProtectMemory(g_dsp.iram, DSP_IRAM_BYTE_SIZE, false);
DSPAnalyzer::Analyze();
}
void gdsp_shutdown()
{
FreeMemoryPages(g_dsp.irom, DSP_IROM_BYTE_SIZE);
FreeMemoryPages(g_dsp.iram, DSP_IRAM_BYTE_SIZE);
FreeMemoryPages(g_dsp.dram, DSP_DRAM_BYTE_SIZE);
FreeMemoryPages(g_dsp.coef, DSP_COEF_BYTE_SIZE);
}
void gdsp_reset()
{
_assert_msg_(MASTER_LOG, !g_dsp.exception_in_progress_hack, "reset while exception");
g_dsp.pc = DSP_RESET_VECTOR;
g_dsp.exception_in_progress_hack = false;
}
void gdsp_generate_exception(u8 level)
{
g_dsp.exceptions |= 1 << level;
}
bool gdsp_load_irom(const char *fname)
{
FILE *pFile = fopen(fname, "rb");
if (pFile)
{
size_t size_in_bytes = DSP_IROM_SIZE * sizeof(u16);
size_t read_bytes = fread(g_dsp.irom, 1, size_in_bytes, pFile);
if (read_bytes != size_in_bytes)
{
PanicAlert("IROM too short : %i/%i", (int)read_bytes, (int)size_in_bytes);
fclose(pFile);
return false;
}
fclose(pFile);
// Byteswap the rom.
for (int i = 0; i < DSP_IROM_SIZE; i++)
g_dsp.irom[i] = Common::swap16(g_dsp.irom[i]);
return true;
}
// Always keep IROM write protected.
WriteProtectMemory(g_dsp.irom, DSP_IROM_BYTE_SIZE, false);
return false;
}
bool gdsp_load_coef(const char *fname)
{
FILE *pFile = fopen(fname, "rb");
if (pFile)
{
size_t size_in_bytes = DSP_COEF_SIZE * sizeof(u16);
size_t read_bytes = fread(g_dsp.coef, 1, size_in_bytes, pFile);
if (read_bytes != size_in_bytes)
{
PanicAlert("COEF too short : %i/%i", (int)read_bytes, (int)size_in_bytes);
fclose(pFile);
return false;
}
fclose(pFile);
// Byteswap the rom.
for (int i = 0; i < DSP_IROM_SIZE; i++)
g_dsp.coef[i] = Common::swap16(g_dsp.coef[i]);
return true;
}
// Always keep COEF write protected. We unprotect only when DMA-ing
WriteProtectMemory(g_dsp.coef, DSP_COEF_BYTE_SIZE, false);
return false;
}
void gdsp_check_external_int()
{
// check if there is an external interrupt
if (g_dsp.cr & CR_EXTERNAL_INT)
{
if (dsp_SR_is_flag_set(FLAG_ENABLE_INTERUPT) && (g_dsp.exception_in_progress_hack == false))
{
// level 7 is the interrupt exception
gdsp_generate_exception(7);
g_dsp.cr &= ~0x0002;
}
}
}
void gdsp_check_exceptions()
{
// check exceptions
if ((g_dsp.exceptions != 0) && (!g_dsp.exception_in_progress_hack))
{
for (int i = 0; i < 8; i++)
{
if (g_dsp.exceptions & (1 << i))
{
_assert_msg_(MASTER_LOG, !g_dsp.exception_in_progress_hack, "assert while exception");
dsp_reg_store_stack(DSP_STACK_C, g_dsp.pc);
dsp_reg_store_stack(DSP_STACK_D, g_dsp.r[DSP_REG_SR]);
g_dsp.pc = i * 2;
g_dsp.exceptions &= ~(1 << i);
g_dsp.exception_in_progress_hack = true;
break;
}
}
}
}
//} // namespace
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