Hi all,
I am trying to get one of the two CPUs of my linux box isolated from
interrupts. Sp I have made some changes in the io_apic.c and smp.c
files of my linux-2.1.131 kernel. But when I make a 'cat
/proc/interrupts' this is what it lists:
/*************/
CPU0 CPU1
0: 73310 90992 IO-APIC-edge timer
1: 1 1 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
8: 1 0 IO-APIC-edge rtc
12: 471 351 IO-APIC-edge PS/2 Mouse
13: 1 0 XT-PIC fpu
16: 9848 0 IO-APIC-level aic7xxx, aic7xxx
20: 9289 0 IO-APIC-level Intel EtherExpress
Pro 10/100 Ethernet
21: 2201 0 IO-APIC-level eni
NMI: 0
IPI: 0
/*******************/
which means that edge trigger interruptions are arriving to CPU #1
(which is the one I am trying to isolate).
I enclose the patch for io_apic.c and smp.c that I have made, to show
you what I have done... could you please explain me why I do not get to
isolate CPU #1 from edge-trigger interruptions??- Thank you in advance
/***************/
diff -u -r linux-2.1.131/arch/i386/kernel/io_apic.c
linux-2.1.131.patched/arch/i386/kernel/io_apic.c
--- linux-2.1.131/arch/i386/kernel/io_apic.c Wed Oct 7 01:44:00 1998
+++ linux-2.1.131.patched/arch/i386/kernel/io_apic.c Thu Jan 7 12:07:19
1999
@@ -594,7 +594,7 @@
if (irq_trigger(idx)) {
entry.trigger = 1;
entry.mask = 1;
- entry.dest.logical.logical_dest = 0xff;
+ entry.dest.logical.logical_dest = 0x1; /* mpadmin patch */
}
irq = pin_2_irq(idx,pin);
diff -u -r linux-2.1.131/arch/i386/kernel/smp.c
linux-2.1.131.patched/arch/i386/kernel/smp.c
--- linux-2.1.131/arch/i386/kernel/smp.c Mon Oct 5 22:19:44 1998
+++ linux-2.1.131.patched/arch/i386/kernel/smp.c Thu Jan 7 12:07:52
1999
@@ -648,6 +648,10 @@
value &= ~(1<<9); /* Enable focus processor (bit==0) */
value |= 0xff; /* Set spurious IRQ vector to 0xff */
apic_write(APIC_SPIV,value);
+
+ value=apic_read(APIC_LDR);
+ value=(value&0xffffff) | (0x2<<24);
+ apic_write(APIC_LDR, value);
value = apic_read(APIC_TASKPRI);
value &= ~APIC_TPRI_MASK; /* Set Task Priority to 'accept all' */
@@ -983,7 +987,7 @@
void __init smp_boot_cpus(void)
{
int i;
- unsigned long cfg;
+ unsigned long cfg, l;
#ifdef CONFIG_MTRR
/* Must be done before other processors booted */
@@ -1078,6 +1082,10 @@
*/
setup_APIC_clock ();
+ l=apic_read(APIC_LDR);
+ l=(l&0xffffff) | (0x1<<24);
+ apic_write(APIC_LDR, l);
+
/*
* Now scan the CPU present map and fire up the other CPUs.
*/
@@ -1795,6 +1803,10 @@
*/
ack_APIC_irq ();
+
+ printk("LOCAL APIC for CPU hard %d, id %d: LDR=0x%x DFR=0x%x\n",
+ hard_smp_processor_id(), smp_processor_id(),
+ apic_read(APIC_LDR), apic_read(APIC_DFR));
__restore_flags(flags);
}
/*****************************/
Looking forward to hearing from you.
Best Regards
--
..............................................................................
Elena Nistal
Telefonica I+D
Servicios Avanzados en Red
Emilio Vargas, 6
28043 Madrid (Spain)
tel.:+34 913379915 fax: +34 913374491
e-mail:[EMAIL PROTECTED]
http://www.tid.es
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