MD support for PCI Message Signalled Interrupts on amd64 and i386:

- Add a new apic_alloc_vectors() method to the local APIC support code
  to allocate N contiguous IDT vectors (aligned on a M >= N boundary).
  This function is used to allocate IDT vectors for a group of MSI
  messages.
- Add MSI and MSI-X PICs.  The PIC code here provides methods to manage
  edge-triggered MSI messages as x86 interrupt sources.  In addition to
  the PIC methods, msi.c also includes methods to allocate and release
  MSI and MSI-X messages.  For x86, we allow for up to 128 different
  MSI IRQs starting at IRQ 256 (IRQs 0-15 are reserved for ISA IRQs,
  16-254 for APIC PCI IRQs, and IRQ 255 is reserved).
- Add pcib_(alloc|release)_msi[x]() methods to the MD x86 PCI bridge
  drivers to bubble the request up to the nexus driver.
- Add pcib_(alloc|release)_msi[x]() methods to the x86 nexus drivers that
  ask the MSI PIC code to allocate resources and IDT vectors.

MFC after:	2 months

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/amd64/include/apicvar.h b/sys/amd64/include/apicvar.h
index ebd8f04..6cc37c6 100644
--- a/sys/amd64/include/apicvar.h
+++ b/sys/amd64/include/apicvar.h
@@ -175,6 +175,7 @@ inthand_t
 	IDTVEC(apic_isr7), IDTVEC(spuriousint), IDTVEC(timerint);
 
 u_int	apic_alloc_vector(u_int irq);
+u_int	apic_alloc_vectors(u_int *irqs, u_int count, u_int align);
 void	apic_enable_vector(u_int vector);
 void	apic_free_vector(u_int vector, u_int irq);
 u_int	apic_idt_to_irq(u_int vector);