diff options
Diffstat (limited to 'arch/mips64/sgi-ip22/ip22-int.c')
| -rw-r--r-- | arch/mips64/sgi-ip22/ip22-int.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/arch/mips64/sgi-ip22/ip22-int.c b/arch/mips64/sgi-ip22/ip22-int.c index 420e47fc7..a26ad631d 100644 --- a/arch/mips64/sgi-ip22/ip22-int.c +++ b/arch/mips64/sgi-ip22/ip22-int.c @@ -1,4 +1,4 @@ -/* $Id: ip22-int.c,v 1.3 1999/12/04 03:59:01 ralf Exp $ +/* $Id: ip22-int.c,v 1.4 2000/02/04 07:40:24 ralf Exp $ * * indy_int.c: Routines for generic manipulation of the INT[23] ASIC * found on INDY workstations.. @@ -37,6 +37,24 @@ #include <asm/sgi/sgint23.h> #include <asm/sgialib.h> +/* + * Linux has a controller-independent x86 interrupt architecture. + * every controller has a 'controller-template', that is used + * by the main code to do the right thing. Each driver-visible + * interrupt source is transparently wired to the apropriate + * controller. Thus drivers need not be aware of the + * interrupt-controller. + * + * Various interrupt controllers we handle: 8259 PIC, SMP IO-APIC, + * PIIX4's internal 8259 PIC and SGI's Visual Workstation Cobalt (IO-)APIC. + * (IO-APICs assumed to be messaging to Pentium local-APICs) + * + * the code is designed to be easily extended with new/different + * interrupt controllers, without having to do assembly magic. + */ + +irq_cpustat_t irq_stat [NR_CPUS]; + struct sgi_int2_regs *sgi_i2regs; struct sgi_int3_regs *sgi_i3regs; struct sgi_ioc_ints *ioc_icontrol; |