patch-2.3.9 linux/arch/mips/sgi/kernel/indy_int.c

• Lines: 183
• Date: Wed Jun 30 11:24:54 1999
• Orig file: v2.3.8/linux/arch/mips/sgi/kernel/indy_int.c
• Orig date: Tue Oct 20 13:52:55 1998

diff -u --recursive --new-file v2.3.8/linux/arch/mips/sgi/kernel/indy_int.c linux/arch/mips/sgi/kernel/indy_int.c
@@ -1,14 +1,15 @@
-/* $Id: indy_int.c,v 1.9 1998/05/28 03:18:00 ralf Exp $
+/* $Id: indy_int.c,v 1.13 1999/06/12 17:26:15 ulfc Exp $
  *
  * indy_int.c: Routines for generic manipulation of the INT[23] ASIC
  *             found on INDY workstations..
  *
  * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
  * Copyright (C) 1997, 1998 Ralf Baechle (ralf@gnu.org)
+ * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu) 
+ *                    - Indigo2 changes
+ *                    - Interrupt handling fixes
  */
-#include <linux/config.h>
 #include <linux/init.h>
-
 #include <linux/errno.h>
 #include <linux/kernel_stat.h>
 #include <linux/signal.h>
@@ -35,6 +36,7 @@
 #include <asm/sgihpc.h>
 #include <asm/sgint23.h>
 #include <asm/sgialib.h>
+#include <asm/gdb-stub.h>
 
 /* #define DEBUG_SGINT */
 
@@ -51,10 +53,6 @@
 
 extern asmlinkage void indyIRQ(void);
 
-#ifdef CONFIG_REMOTE_DEBUG
-extern void rs_kgdb_hook(int);
-#endif
-
 unsigned int local_bh_count[NR_CPUS];
 unsigned int local_irq_count[NR_CPUS];
 unsigned long spurious_count = 0;
@@ -274,7 +272,7 @@
 	int do_random, cpu;
 
 	cpu = smp_processor_id();
-	irq_enter(cpu, irq);
+	hardirq_enter(cpu);
 	kstat.irqs[0][irq]++;
 
 	printk("Got irq %d, press a key.", irq);
@@ -310,7 +308,7 @@
 			add_interrupt_randomness(irq);
 		__cli();
 	}
-	irq_exit(cpu, irq);
+	hardirq_exit(cpu);
 
 	/* unmasking and bottom half handling is done magically for us. */
 }
@@ -448,10 +446,23 @@
 		action = local_irq_action[irq];
 	}
 
-	irq_enter(cpu, irq);
+	/* if irq == 0, then the interrupt has already been cleared */
+	if ( irq == 0 ) { goto end; }
+	/* if action == NULL, then we do have a handler for the irq */
+	if ( action == NULL ) { goto no_handler; }
+	
+	hardirq_enter(cpu);
 	kstat.irqs[0][irq + 16]++;
 	action->handler(irq, action->dev_id, regs);
-	irq_exit(cpu, irq);
+	hardirq_exit(cpu);
+	goto end;
+
+no_handler:
+	printk("No handler for local0 irq: %i\n", irq);
+
+end:	
+	return;	
+	
 }
 
 void indy_local1_irqdispatch(struct pt_regs *regs)
@@ -472,10 +483,23 @@
 		irq = lc1msk_to_irqnr[mask];
 		action = local_irq_action[irq];
 	}
-	irq_enter(cpu, irq);
+	/* if irq == 0, then the interrupt has already been cleared */
+	/* not sure if it is needed here, but it is needed for local0 */
+	if ( irq == 0 ) { goto end; }
+	/* if action == NULL, then we do have a handler for the irq */
+	if ( action == NULL ) { goto no_handler; }
+	
+	hardirq_enter(cpu);
 	kstat.irqs[0][irq + 24]++;
 	action->handler(irq, action->dev_id, regs);
-	irq_exit(cpu, irq);
+	hardirq_exit(cpu);
+	goto end;
+	
+no_handler:
+	printk("No handler for local1 irq: %i\n", irq);
+
+end:	
+	return;	
 }
 
 void indy_buserror_irq(struct pt_regs *regs)
@@ -483,13 +507,13 @@
 	int cpu = smp_processor_id();
 	int irq = 6;
 
-	irq_enter(cpu, irq);
+	hardirq_enter(cpu);
 	kstat.irqs[0][irq]++;
 	printk("Got a bus error IRQ, shouldn't happen yet\n");
 	show_regs(regs);
 	printk("Spinning...\n");
 	while(1);
-	irq_exit(cpu, irq);
+	hardirq_exit(cpu);
 }
 
 /* Misc. crap just to keep the kernel linking... */
@@ -506,9 +530,6 @@
 __initfunc(void sgint_init(void))
 {
 	int i;
-#ifdef CONFIG_REMOTE_DEBUG
-	char *ctype;
-#endif
 
 	sgi_i2regs = (struct sgi_int2_regs *) (KSEG1 + SGI_INT2_BASE);
 	sgi_i3regs = (struct sgi_int3_regs *) (KSEG1 + SGI_INT3_BASE);
@@ -563,9 +584,16 @@
 		}
 	}
 
-	ioc_icontrol = &sgi_i3regs->ints;
-	ioc_timers = &sgi_i3regs->timers;
-	ioc_tclear = &sgi_i3regs->tclear;
+	/* Indy uses an INT3, Indigo2 uses an INT2 */
+	if (sgi_guiness) {
+		ioc_icontrol = &sgi_i3regs->ints;
+		ioc_timers = &sgi_i3regs->timers;
+		ioc_tclear = &sgi_i3regs->tclear;
+	} else {
+		ioc_icontrol = &sgi_i2regs->ints;
+		ioc_timers = &sgi_i2regs->timers;
+		ioc_tclear = &sgi_i2regs->tclear;
+	}
 
 	/* Mask out all interrupts. */
 	ioc_icontrol->imask0 = 0;
@@ -575,28 +603,4 @@
 
 	/* Now safe to set the exception vector. */
 	set_except_vector(0, indyIRQ);
-
-#ifdef CONFIG_REMOTE_DEBUG
-	ctype = prom_getcmdline();
-	for(i = 0; i < strlen(ctype); i++) {
-		if(ctype[i]=='k' && ctype[i+1]=='g' &&
-		   ctype[i+2]=='d' && ctype[i+3]=='b' &&
-		   ctype[i+4]=='=' && ctype[i+5]=='t' &&
-		   ctype[i+6]=='t' && ctype[i+7]=='y' &&
-		   ctype[i+8]=='d' &&
-		   (ctype[i+9] == '1' || ctype[i+9] == '2')) {
-			printk("KGDB: Using serial line /dev/ttyd%d for "
-			       "session\n", (ctype[i+9] - '0'));
-				if(ctype[i+9]=='1')
-					rs_kgdb_hook(1);
-				else if(ctype[i+9]=='2')
-					rs_kgdb_hook(0);
-				else {
-					printk("KGDB: whoops bogon tty line "
-					       "requested, disabling session\n");
-				}
-
-		}
-	}
-#endif
 }