CVS commit: src/sys/arch/xen

["Cherry G. Mathew" <cherry%netbsd.org@localhost>]

Module Name:    src
Committed By:   cherry
Date:           Tue Feb 12 08:04:53 UTC 2019

Modified Files:
        src/sys/arch/xen/include: xenfunc.h
        src/sys/arch/xen/x86: xen_intr.c

Log Message:
Move xen event related code which interfaces with the NetBSD interrupt
subsystem into a separate namespace where it can co-exist with the
native equivalent in PVHVM mode.

On PV, we alias and export the native symbols - this means that
although the namespace is different, the semantics must be identical.

Eg: xen_intr_establish_xname() vs. intr_establish_xname().

The specific functions we need in PVHVM are:

 - spllower, xen_spllower (for native as well as XEN event spl
   despatch/defer)
 - xen_disable_intr()/xen_enable_intr() ,
   x86_disable_intr()/x86_enable_intr()
 - xen_read_psl()/xen_write_psl(),
   x86_read_psl()/x86_write_psl()
 - intr_establish() et. al, xen_intr_establish() et. al.

This gives us the ability to manage Paravirtualised drivers such as
xbd(4) as well as fully emulated ones such as wd(4)., for eg


To generate a diff of this commit:
cvs rdiff -u -r1.16 -r1.17 src/sys/arch/xen/include/xenfunc.h
cvs rdiff -u -r1.13 -r1.14 src/sys/arch/xen/x86/xen_intr.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.