git: 9front

Info  •  Files  •  Log  •  Branches

improved interrupt vector allocation code

--- a/sys/src/9/pc/mp.c

+++ b/sys/src/9/pc/mp.c

@@ -705,7 +705,25 @@

 	return mpapic[i].apicno;

 }

+/* hardcoded VectorAPIC and stuff. bad. */

 static int

+allocvector(void)

+{

+	static int round = 0, num = 1;

+	static Lock l;

+	int vno;

+	

+	lock(&l);

+	if(num >= 24) {

+		if(++round >= 8) round = 0;

+		num = 1;

+	}

+	vno = 64 + num++ * 8 + round;

+	unlock(&l);

+	return vno;

+}

+

+static int

 mpintrenablex(Vctl* v, int tbdf)

 {

 	Bus *bus;

@@ -806,13 +824,7 @@

 		 *    vector regardless of whether the devices on that pin use

 		 *    the same IRQ as devices on another pin.

 		 */

-		vno = VectorAPIC + (incref(&mpvnoref)-1)*8;

-//print("%s vector %d (imask)\n", v->name, vno);

-		if(vno > MaxVectorAPIC){

-			print("mpintrenable: vno %d, irq %d, tbdf %uX\n",

-				vno, v->irq, tbdf);

-			return -1;

-		}

+		vno = allocvector();

 		hi = mpintrcpu()<<24;

 		lo = mpintrinit(bus, aintr->intr, vno, v->irq);

 		//print("lo 0x%uX: busno %d intr %d vno %d irq %d elcr 0x%uX\n",

@@ -869,11 +881,7 @@

 			break;

 	}

-	vno = VectorAPIC + (incref(&mpvnoref)-1)*8;

-	if(vno > MaxVectorAPIC) {

-		print("msiintrenable: vno %d\n", vno);

-		return -1;

-	}

+	vno = allocvector();

 	cpu = mpintrcpu();

 	pcicfgw32(pci, cap + MSIAddr, (0xFEE << 20) | (cpu << 12));

 	pcicfgw32(pci, cap + MSIAddr + 4, 0);

-- 

⑨