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powerpc: iSeries has only 256 IRQs

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The iSeries Hypervisor only allows us to specify IRQ numbers up to 255 (it
has a u8 field to pass it in).  This patch allows platforms to specify a
maximum to the virtual IRQ numbers we will use and has iSeries set that
to 255.  If not set, the maximum is NR_IRQS - 1 (as before).

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
This commit is contained in:
Stephen Rothwell
2006-04-04 14:49:48 +10:00
parent 6246b6128b
commit 7d01c88085
3 changed files with 36 additions and 14 deletions
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7
include/asm-powerpc/irq.h
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@@ -54,6 +54,13 @@
*/
extern unsigned int virt_irq_to_real_map[NR_IRQS];
/* The maximum virtual IRQ number that we support. This
* can be set by the platform and will be reduced by the
* value of __irq_offset_value. It defaults to and is
* capped by (NR_IRQS - 1).
*/
extern unsigned int virt_irq_max;
/* Create a mapping for a real_irq if it doesn't already exist.
* Return the virtual irq as a convenience.
*/