1991/0709/pc/io.h (diff list | history)

1991/0706/sys/src/9/pc/io.h:1,21 – 1991/0709/sys/src/9/pc/io.h:1,12 (short | long | prev | next)
1991/0703		/*
1991/0704		* 8259 interrupt controllers
1991/0709		* programmable interrupt vectors (for the 8259)
1991/0703		*/
1991/0704		enum { Int0ctl= 0x20, /* control port */ Int0aux= 0x21, /* everything else port */ Int1ctl= 0xA0, /* control port */ Int1aux= 0xA1, /* everything else port */                  Intena= 0x20, /* written to Intctlport, enables next int */
1991/0706		Int0vec= 16, /* first interrupt vector used by the 8259 */
1991/0704		Clockvec= Int0vec+0, /* clock interrupts */ Kbdvec= Int0vec+1, /* keyboard interrupts */
1991/0703		};
1991/0704		#define INT0ENABLE outb(Int0ctl, Intena) #define INT1ENABLE outb(Int1ctl, Intena)
1991/0703		/*
1991/0704		* 8237 dma controllers