git: 9front

ref: 869ddb3e052d5be3afe7c5b339e37e7ca152ed7a
dir: /sys/src/9/arm64/io.h/

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enum {
	IRQfiq		= -1,

	PPI		= 16,
	SPI		= 32,

	IRQcntvns	= PPI+11,

	IRQuart		= SPI+1,

	IRQpci1		= SPI+3,
	IRQpci2		= SPI+4,
	IRQpci3		= SPI+5,
	IRQpci4		= SPI+6,
};

#define BUSUNKNOWN (-1)