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SubjectRe: [RFC][2.6.12.3] Use vectors 0x21-0x2F
Date
Quick and dirty patch to use the 16 vectors that appear to have
fallen through the cracks. This also is useful for older CPUs that
have serial APICS: P54C, P6, P2, P3, K5, K6, etc. They can benefit
from the extra vector space to hash the IRQs.

I suppose I could have started at 0x20 instead of 0x21. The extra
level probably would more than compensate for having to skip 0x80 on
the initial allocations.

Signed-off-by: James Cleverdon <jamesclv@us.ibm.com>


diff -pru 2.6.12.3/include/asm-i386/mach-default/irq_vectors.h z12.3/include/asm-i386/mach-default/irq_vectors.h
--- 2.6.12.3/include/asm-i386/mach-default/irq_vectors.h 2005-07-15 14:18:57.000000000 -0700
+++ z12.3/include/asm-i386/mach-default/irq_vectors.h 2005-08-14 15:35:46.000000000 -0700
@@ -31,10 +31,6 @@
#define SYSCALL_VECTOR 0x80

/*
- * Vectors 0x20-0x2f are used for ISA interrupts.
- */
-
-/*
* Special IRQ vectors used by the SMP architecture, 0xf0-0xff
*
* some of the following vectors are 'rare', they are merged
@@ -58,11 +54,11 @@
#define LOCAL_TIMER_VECTOR 0xef

/*
- * First APIC vector available to drivers: (vectors 0x30-0xee)
- * we start at 0x31 to spread out vectors evenly between priority
+ * First APIC vector available to drivers: (vectors 0x20-0xee)
+ * we start at 0x21 to spread out vectors evenly between priority
* levels. (0x80 is the syscall vector)
*/
-#define FIRST_DEVICE_VECTOR 0x31
+#define FIRST_DEVICE_VECTOR 0x21
#define FIRST_SYSTEM_VECTOR 0xef

#define TIMER_IRQ 0
diff -pru 2.6.12.3/include/asm-x86_64/hw_irq.h z12.3/include/asm-x86_64/hw_irq.h
--- 2.6.12.3/include/asm-x86_64/hw_irq.h 2005-07-15 14:18:57.000000000 -0700
+++ z12.3/include/asm-x86_64/hw_irq.h 2005-08-14 15:37:30.000000000 -0700
@@ -36,10 +36,6 @@ struct hw_interrupt_type;


/*
- * Vectors 0x20-0x2f are used for ISA interrupts.
- */
-
-/*
* Special IRQ vectors used by the SMP architecture, 0xf0-0xff
*
* some of the following vectors are 'rare', they are merged
@@ -67,11 +63,11 @@ struct hw_interrupt_type;
#define LOCAL_TIMER_VECTOR 0xef

/*
- * First APIC vector available to drivers: (vectors 0x30-0xee)
- * we start at 0x31 to spread out vectors evenly between priority
+ * First APIC vector available to drivers: (vectors 0x20-0xee)
+ * we start at 0x21 to spread out vectors evenly between priority
* levels. (0x80 is the syscall vector)
*/
-#define FIRST_DEVICE_VECTOR 0x31
+#define FIRST_DEVICE_VECTOR 0x21
#define FIRST_SYSTEM_VECTOR 0xef /* duplicated in irq.h */



--
James Cleverdon
IBM LTC (xSeries Linux Solutions)
{jamesclv(Unix, preferred), cleverdj(Notes)} at us dot ibm dot comm
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