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Diffstat (limited to 'trunk/src/emu/cpu/psx/irq.c')
-rw-r--r--trunk/src/emu/cpu/psx/irq.c112
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;
+}