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/* unofficial gameplaySP kai
*
* Copyright (C) 2006 Exophase <exophase@gmail.com>
* Copyright (C) 2007 takka <takka@tfact.net>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "common.h"
const uint8_t bit_count[256] =
{
0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
};
const uint32_t psr_masks[16] =
{
0x00000000, 0x000000FF, 0x0000FF00, 0x0000FFFF, 0x00FF0000,
0x00FF00FF, 0x00FFFF00, 0x00FFFFFF, 0xFF000000, 0xFF0000FF,
0xFF00FF00, 0xFF00FFFF, 0xFFFF0000, 0xFFFF00FF, 0xFFFFFF00,
0xFFFFFFFF
};
void set_cpu_mode(CPU_MODE_TYPE new_mode)
{
uint32_t i;
CPU_MODE_TYPE cpu_mode = reg[CPU_MODE];
if(cpu_mode != new_mode)
{
if(new_mode == MODE_FIQ)
{
for(i = 8; i < 15; i++)
{
reg_mode[cpu_mode][i - 8] = reg[i];
}
}
else
{
reg_mode[cpu_mode][5] = reg[REG_SP];
reg_mode[cpu_mode][6] = reg[REG_LR];
}
if(cpu_mode == MODE_FIQ)
{
for(i = 8; i < 15; i++)
{
reg[i] = reg_mode[new_mode][i - 8];
}
}
else
{
reg[REG_SP] = reg_mode[new_mode][5];
reg[REG_LR] = reg_mode[new_mode][6];
}
reg[CPU_MODE] = new_mode;
}
}
void raise_interrupt(IRQ_TYPE irq_raised)
{
// The specific IRQ must be enabled in IE, master IRQ enable must be on,
// and it must be on in the flags.
io_registers[REG_IF] |= irq_raised;
if((io_registers[REG_IME] & 0x01) && (io_registers[REG_IE] & io_registers[REG_IF]) && ((reg[REG_CPSR] & 0x80) == 0))
{
bios_read_protect = 0xe55ec002;
// Interrupt handler in BIOS
reg_mode[MODE_IRQ][6] = reg[REG_PC] + 4;
spsr[MODE_IRQ] = reg[REG_CPSR];
reg[REG_CPSR] = 0xD2;
reg[REG_PC] = 0x00000018;
bios_region_read_allow();
set_cpu_mode(MODE_IRQ);
reg[CPU_HALT_STATE] = CPU_ACTIVE;
reg[CHANGED_PC_STATUS] = 1;
}
}
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