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author | David S. Miller <davem@davemloft.net> | 2006-06-20 01:22:35 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2006-06-20 01:22:35 -0700 |
commit | 8047e247c899f80c33a23ad7e9e250224f0d26a5 (patch) | |
tree | 253a7ba3c902730928214df5c2b5630d7875cc11 /arch/sparc64/kernel/pci_sun4v.c | |
parent | 37cdcd9e82108f9b899f1631f66ade2e45738a6e (diff) | |
download | kernel_samsung_smdk4412-8047e247c899f80c33a23ad7e9e250224f0d26a5.zip kernel_samsung_smdk4412-8047e247c899f80c33a23ad7e9e250224f0d26a5.tar.gz kernel_samsung_smdk4412-8047e247c899f80c33a23ad7e9e250224f0d26a5.tar.bz2 |
[SPARC64]: Virtualize IRQ numbers.
Inspired by PowerPC XICS interrupt support code.
All IRQs are virtualized in order to keep NR_IRQS from needing
to be too large. Interrupts on sparc64 are arbitrary 11-bit
values, but we don't need to define NR_IRQS to 2048 if we
virtualize the IRQs.
As PCI and SBUS controller drivers build device IRQs, we divy
out virtual IRQ numbers incrementally starting at 1. Zero is
a special virtual IRQ used for the timer interrupt.
So device drivers all see virtual IRQs, and all the normal
interfaces such as request_irq(), enable_irq(), etc. translate
that into a real IRQ number in order to configure the IRQ.
At this point knowledge of the struct ino_bucket is almost
entirely contained within arch/sparc64/kernel/irq.c There are
a few small bits in the PCI controller drivers that need to
be swept away before we can remove ino_bucket's definition
out of asm-sparc64/irq.h and privately into kernel/irq.c
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/kernel/pci_sun4v.c')
0 files changed, 0 insertions, 0 deletions