deal with some strict aliasing issues

[picodrive.git] / pico / cd / misc.c

/*
 * PicoDrive
 * (C) notaz, 2007
 *
 * This work is licensed under the terms of MAME license.
 * See COPYING file in the top-level directory.
 */

#include "../pico_int.h"

unsigned char formatted_bram[4*0x10] =
{
#if 0
	0x00, 0xd4, 0x63, 0x00, 0x00, 0x03, 0x03, 0x00, 0x03, 0x03, 0x03, 0x00, 0x03, 0x00, 0x00, 0x03,
	0x00, 0x03, 0x00, 0x00, 0x00, 0x03, 0x03, 0x00, 0x53, 0xd2, 0xf5, 0x3a, 0x48, 0x50, 0x35, 0x0f,
	0x47, 0x14, 0xf5, 0x7e, 0x5c, 0xd4, 0xf3, 0x03, 0x00, 0x03, 0x12, 0x00, 0x0a, 0xff, 0xca, 0xa6,
	0xf5, 0x27, 0xed, 0x22, 0x47, 0xfa, 0x22, 0x96, 0x6c, 0xa5, 0x88, 0x14, 0x48, 0x48, 0x0a, 0xbb,
#endif
	0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x00, 0x00, 0x00, 0x00, 0x40,
	0x00, 0x7d, 0x00, 0x7d, 0x00, 0x7d, 0x00, 0x7d, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x53, 0x45, 0x47, 0x41, 0x5f, 0x43, 0x44, 0x5f, 0x52, 0x4f, 0x4d, 0x00, 0x01, 0x00, 0x00, 0x00,
	0x52, 0x41, 0x4d, 0x5f, 0x43, 0x41, 0x52, 0x54, 0x52, 0x49, 0x44, 0x47, 0x45, 0x5f, 0x5f, 0x5f,
	// SEGA_CD_ROM.....RAM_CARTRIDGE___
};


// offs | 2Mbit  | 1Mbit  |
//   0  | [ 2M   | unused |
// 128K |  bit ] | bank0  |
// 256K | unused | bank1  |

#ifndef _ASM_MISC_C
PICO_INTERNAL_ASM void wram_2M_to_1M(unsigned char *m)
{
	unsigned short *m1M_b0, *m1M_b1;
	unsigned int i, tmp, *m2M;

	m2M = (unsigned int *) (m + 0x40000);
	m1M_b0 = (unsigned short *) m2M;
	m1M_b1 = (unsigned short *) (m + 0x60000);

	for (i = 0x40000/4; i; i--)
	{
		tmp = *(--m2M);
		*(--m1M_b0) = tmp;
		*(--m1M_b1) = tmp >> 16;
	}
}

PICO_INTERNAL_ASM void wram_1M_to_2M(unsigned char *m)
{
	unsigned short *m1M_b0, *m1M_b1;
	unsigned int i, tmp, *m2M;

	m2M = (unsigned int *) m;
	m1M_b0 = (unsigned short *) (m + 0x20000);
	m1M_b1 = (unsigned short *) (m + 0x40000);

	for (i = 0x40000/4; i; i--)
	{
		tmp = *m1M_b0++ | (*m1M_b1++ << 16);
		*m2M++ = tmp;
	}
}
#endif