23 static __u8 mac_asc_wave_tab[ 0x800 ];
26  * Alan's original sine table; needs interpolating to 0x800
27  * (hint: interpolate or hardwire [0 -> Pi/2[, it's symmetric)
30 	0,  39,  75,  103,  121,  127,  121,  103,  75,  39,
31 	0, -39, -75, -103, -121, -127, -121, -103, -75, -39
37 static volatile __u8* mac_asc_regs = ( void* )0x50F14000;
44 static unsigned long mac_bell_phase; /* 0..2*Pi -> 0..0x800 (wavetable size) */
74 	 *	mac_asc_regs[ 0x800 ] & 0xF0 != 0  in mac_init_asc()
84 			mac_asc_regs = ( void* )0x50010000;  in mac_init_asc()
147 	for ( i = 0; i < 0x400; i++ )  in mac_init_asc()
150 		mac_asc_wave_tab[ i + 0x400 ] = 0xFF - i / 4;  in mac_init_asc()
185 	if ( freq < 20 || freq > 20000 || length == 0 )  in mac_mksound()
187 		mac_nosound( 0 );  in mac_mksound()
195 	for ( i = 0; i < 0x800; i++ )  in mac_mksound()
196 		mac_asc_regs[ i ] = 0;  in mac_mksound()
197 	for ( i = 0; i < 0x800; i++ )  in mac_mksound()
200 	for ( i = 0; i < 8; i++ )  in mac_mksound()
201 		*( __u32* )( ( __u32 )mac_asc_regs + ASC_CONTROL + 0x814 + 8 * i ) = cfreq;  in mac_mksound()
203 	mac_asc_regs[ 0x807 ] = 0;  in mac_mksound()
205 	mac_asc_regs[ 0x805 ] = 0;  in mac_mksound()
206 	mac_asc_regs[ 0x80F ] = 0;  in mac_mksound()
221 	mac_asc_regs[ ASC_ENABLE ] = 0;  in mac_nosound()
232 	if ( mac_bell_duration > 0 )  in mac_quadra_start_bell()
239 	mac_bell_phase = 0;  in mac_quadra_start_bell()
246 	mac_asc_regs[ 0x806 ] = volume;  in mac_quadra_start_bell()
249 	if ( mac_asc_regs[ 0x801 ] != 1 )  in mac_quadra_start_bell()
252 		mac_asc_regs[ 0x807 ] = 0;  in mac_quadra_start_bell()
254 		mac_asc_regs[ 0x802 ] = 0;  in mac_quadra_start_bell()
256 		mac_asc_regs[ 0x801 ] = 1;  in mac_quadra_start_bell()
257 		mac_asc_regs[ 0x803 ] |= 0x80;  in mac_quadra_start_bell()
258 		mac_asc_regs[ 0x803 ] &= 0x7F;  in mac_quadra_start_bell()
289 	if ( mac_bell_duration-- > 0 )  in mac_quadra_ring_bell()
291 		for ( i = 0; i < count; i++ )  in mac_quadra_ring_bell()
294 			mac_asc_regs[ 0 ] = mac_asc_wave_tab[ mac_bell_phase & ( sizeof( mac_asc_wave_tab ) - 1 ) ];  in mac_quadra_ring_bell()
300 		mac_asc_regs[ 0x801 ] = 0;  in mac_quadra_ring_bell()