mirror of
https://github.com/holub/mame
synced 2025-05-17 19:24:59 +03:00
98c40f06db
machine configuration just as any other device, and the standard CPU configuration is performed via the inline configuration macros. Change cpu_type from an enumeration into a pointer to the CPU's get_info function, very similar to device behavior. For now all CPUs are declared in cpuintrf.h, but eventually they should be declared in the CPU's header file, and the driver should #include that header. Added function cpu_get_type() to return the CPU type. Changed several cpu_* functions into macros that call through to the equivalent device_* function. The device system now maintains a parallel list of devices based on type, for faster iteration through all devices of a given type. Cleaned up code that looped over CPUs via the machine->cpu array to now loop using the type-based device list. Removed start/stop/reset/nvram functions from the device_config in favor of grabbing them as needed. Cleaned up the generic interrupt_enable code to work with CPU devices instead of numbers. Mapped the devtag_* functions to device_* functions via macros instead of parallel implementations.
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/***************************************************************************
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z80daisy.c
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Z80/180 daisy chaining support functions.
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***************************************************************************/
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#include "driver.h"
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#include "z80daisy.h"
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struct _z80_daisy_state
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{
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z80_daisy_state * next; /* next device */
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const device_config * device; /* associated device */
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z80_daisy_irq_state irq_state; /* IRQ state callback */
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z80_daisy_irq_ack irq_ack; /* IRQ ack callback */
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z80_daisy_irq_reti irq_reti; /* IRQ reti callback */
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};
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z80_daisy_state *z80daisy_init(const device_config *cpudevice, const z80_daisy_chain *daisy)
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{
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astring *tempstring = astring_alloc();
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z80_daisy_state *head = NULL;
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z80_daisy_state **tailptr = &head;
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/* create a linked list of devices */
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for ( ; daisy->devtype != NULL; daisy++)
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{
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*tailptr = auto_malloc(sizeof(**tailptr));
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(*tailptr)->next = NULL;
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(*tailptr)->device = devtag_get_device(cpudevice->machine, daisy->devtype, device_inherit_tag(tempstring, cpudevice->tag, daisy->devname));
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if ((*tailptr)->device == NULL)
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fatalerror("Unable to locate device '%s'", daisy->devname);
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(*tailptr)->irq_state = (z80_daisy_irq_state)device_get_info_fct((*tailptr)->device, DEVINFO_FCT_IRQ_STATE);
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(*tailptr)->irq_ack = (z80_daisy_irq_ack)device_get_info_fct((*tailptr)->device, DEVINFO_FCT_IRQ_ACK);
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(*tailptr)->irq_reti = (z80_daisy_irq_reti)device_get_info_fct((*tailptr)->device, DEVINFO_FCT_IRQ_RETI);
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tailptr = &(*tailptr)->next;
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}
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astring_free(tempstring);
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return head;
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}
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void z80daisy_reset(z80_daisy_state *daisy)
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{
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/* loop over all devices and call their reset function */
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for ( ; daisy != NULL; daisy = daisy->next)
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device_reset(daisy->device);
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}
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int z80daisy_update_irq_state(z80_daisy_state *daisy)
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{
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/* loop over all devices; dev[0] is highest priority */
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for ( ; daisy != NULL; daisy = daisy->next)
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{
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int state = (*daisy->irq_state)(daisy->device);
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/* if this device is asserting the INT line, that's the one we want */
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if (state & Z80_DAISY_INT)
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return ASSERT_LINE;
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/* if this device is asserting the IEO line, it blocks everyone else */
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if (state & Z80_DAISY_IEO)
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return CLEAR_LINE;
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}
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return CLEAR_LINE;
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}
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int z80daisy_call_ack_device(z80_daisy_state *daisy)
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{
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/* loop over all devices; dev[0] is the highest priority */
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for ( ; daisy != NULL; daisy = daisy->next)
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{
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int state = (*daisy->irq_state)(daisy->device);
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/* if this device is asserting the INT line, that's the one we want */
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if (state & Z80_DAISY_INT)
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return (*daisy->irq_ack)(daisy->device);
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}
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logerror("z80daisy_call_ack_device: failed to find an device to ack!\n");
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return 0;
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}
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void z80daisy_call_reti_device(z80_daisy_state *daisy)
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{
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/* loop over all devices; dev[0] is the highest priority */
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for ( ; daisy != NULL; daisy = daisy->next)
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{
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int state = (*daisy->irq_state)(daisy->device);
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/* if this device is asserting the IEO line, that's the one we want */
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if (state & Z80_DAISY_IEO)
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{
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(*daisy->irq_reti)(daisy->device);
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return;
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}
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}
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logerror("z80daisy_call_reti_device: failed to find an device to reti!\n");
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}
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