1993/0217/pc/trap.c (diff list | history)

1993/0216/sys/src/9/pc/trap.c:32,37 – 1993/0217/sys/src/9/pc/trap.c:32,39 (short | long | prev | next)
1991/0709		Int1aux= 0xA1, /* everything else (ICW2, ICW3, ICW4, OCW1) */ EOI= 0x20, /* non-specific end of interrupt */
1993/0217		Maxhandler= 128, /* max number of interrupt handlers */
1991/0709		};
1991/1001		int int0mask = 0xff; /* interrupts enabled for first 8259 */
1993/0216/sys/src/9/pc/trap.c:41,48 – 1993/0217/sys/src/9/pc/trap.c:43,64
1991/0614		* trap/interrupt gates
1991/0613		*/
1991/0703		Segdesc ilt[256]; void (*ivec[256])(void*);
1993/0217		typedef struct Handler Handler; struct Handler { void (*r)(void*); Handler *next; }; struct { Lock; Handler *ivec[256]; Handler h[Maxhandler]; int free; } halloc;
1991/0703		void
1991/0710		sethvec(int v, void (*r)(void), int type, int pri)
1991/0613		{
1993/0216/sys/src/9/pc/trap.c:53,60 – 1993/0217/sys/src/9/pc/trap.c:69,85
1991/0703		void
1991/0716		setvec(int v, void (*r)(Ureg*))
1991/0703		{ ivec[v] = r;
1993/0217		Handler *h;
1991/0709
1993/0217		lock(&halloc); if(halloc.free >= Maxhandler) panic("out of interrupt handlers"); h = &halloc.h[halloc.free++]; h->next = halloc.ivec[v]; h->r = r; halloc.ivec[v] = h; unlock(&halloc);
1991/0709		/* * enable corresponding interrupt in 8259 */
1993/0216/sys/src/9/pc/trap.c:201,206 – 1993/0217/sys/src/9/pc/trap.c:226,232
1991/1112		int v, user;
1991/0731		int c;
1991/1113		char buf[ERRLEN];
1993/0217		Handler *h;
1991/0703
1991/0731		v = ur->trap;
1993/0216/sys/src/9/pc/trap.c:222,228 – 1993/0217/sys/src/9/pc/trap.c:248,254
1991/0823		uartintr0(ur);
1991/1113		} if(v>=256 || ivec[v] == 0){
1993/0217		if(v>=256 || (h = halloc.ivec[v]) == 0){
1991/1214		if(v == 13) return;
1991/1113		if(v <= 16){
1993/0216/sys/src/9/pc/trap.c:239,245 – 1993/0217/sys/src/9/pc/trap.c:265,274
1992/0918		return;
1991/0731		}
1991/0801		(*ivec[v])(ur);
1993/0217		do { (*h->r)(ur); h = h->next; } while(h);
1991/0910
1991/0913		/*
1992/0108		* check user since syscall does its own notifying