diff options
Diffstat (limited to 'trunk/src/emu/cpu/psx/irq.c')
-rw-r--r-- | trunk/src/emu/cpu/psx/irq.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/trunk/src/emu/cpu/psx/irq.c b/trunk/src/emu/cpu/psx/irq.c new file mode 100644 index 00000000000..ff9d00c13e5 --- /dev/null +++ b/trunk/src/emu/cpu/psx/irq.c @@ -0,0 +1,112 @@ +/* + * PlayStation IRQ emulator + * + * Copyright 2003-2011 smf + * + */ + +#include "psx.h" +#include "irq.h" + +#define VERBOSE_LEVEL ( 0 ) + +INLINE void ATTR_PRINTF(3,4) verboselog( running_machine& machine, int n_level, const char *s_fmt, ... ) +{ + if( VERBOSE_LEVEL >= n_level ) + { + va_list v; + char buf[ 32768 ]; + va_start( v, s_fmt ); + vsprintf( buf, s_fmt, v ); + va_end( v ); + logerror( "%s: %s", machine.describe_context(), buf ); + } +} + +const device_type PSX_IRQ = &device_creator<psxirq_device>; + +psxirq_device::psxirq_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, PSX_IRQ, "PSX IRQ", tag, owner, clock) +{ +} + +void psxirq_device::device_reset() +{ + n_irqdata = 0; + n_irqmask = 0; + + psx_irq_update(); +} + +void psxirq_device::device_post_load() +{ + psx_irq_update(); +} + +void psxirq_device::device_start() +{ + save_item( NAME( n_irqdata ) ); + save_item( NAME( n_irqmask ) ); +} + +void psxirq_device::set( UINT32 bitmask ) +{ + verboselog( machine(), 2, "psx_irq_set %08x\n", bitmask ); + n_irqdata |= bitmask; + psx_irq_update(); +} + +void psxirq_device::psx_irq_update( void ) +{ + if( ( n_irqdata & n_irqmask ) != 0 ) + { + verboselog( machine(), 2, "psx irq assert\n" ); + cputag_set_input_line( machine(), "maincpu", PSXCPU_IRQ0, ASSERT_LINE ); + } + else + { + verboselog( machine(), 2, "psx irq clear\n" ); + cputag_set_input_line( machine(), "maincpu", PSXCPU_IRQ0, CLEAR_LINE ); + } +} + +WRITE32_MEMBER( psxirq_device::write ) +{ + switch( offset ) + { + case 0x00: + verboselog( machine(), 2, "psx irq data ( %08x, %08x ) %08x -> %08x\n", data, mem_mask, n_irqdata, ( n_irqdata & ~mem_mask ) | ( n_irqdata & n_irqmask & data ) ); + n_irqdata = ( n_irqdata & ~mem_mask ) | ( n_irqdata & n_irqmask & data ); + psx_irq_update(); + break; + case 0x01: + verboselog( machine(), 2, "psx irq mask ( %08x, %08x ) %08x -> %08x\n", data, mem_mask, n_irqmask, ( n_irqmask & ~mem_mask ) | data ); + n_irqmask = ( n_irqmask & ~mem_mask ) | data; + if( ( n_irqmask &~ PSX_IRQ_MASK ) != 0 ) + { + verboselog( machine(), 0, "psx_irq_w( %08x, %08x, %08x ) unknown irq\n", offset, data, mem_mask ); + } + psx_irq_update(); + break; + default: + verboselog( machine(), 0, "psx_irq_w( %08x, %08x, %08x ) unknown register\n", offset, data, mem_mask ); + break; + } +} + +READ32_MEMBER( psxirq_device::read ) +{ + switch( offset ) + { + case 0x00: + verboselog( machine(), 1, "psx_irq_r irq data %08x\n", n_irqdata ); + return n_irqdata; + case 0x01: + verboselog( machine(), 1, "psx_irq_r irq mask %08x\n", n_irqmask ); + return n_irqmask; + default: + verboselog( machine(), 0, "psx_irq_r unknown register %d\n", offset ); + break; + } + return 0; +} |