On Mon, Jan 25, 2016 at 03:50:52PM +0000, Stefano Stabellini wrote: > On Sat, 23 Jan 2016, Shannon Zhao wrote: > > From: Shannon Zhao <shannon.zhao@xxxxxxxxxx> > > > > Add a "uefi" node under /hypervisor node in FDT, then Linux kernel could > > scan this to get the UEFI information. > > > > Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx> > > Acked-by: Rob Herring <robh@xxxxxxxxxx> > > --- > > CC: Rob Herring <robh@xxxxxxxxxx> > > --- > > Documentation/devicetree/bindings/arm/xen.txt | 34 +++++++++++++++++++++++++++ > > 1 file changed, 34 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/arm/xen.txt b/Documentation/devicetree/bindings/arm/xen.txt > > index 0f7b9c2..aa69405 100644 > > --- a/Documentation/devicetree/bindings/arm/xen.txt > > +++ b/Documentation/devicetree/bindings/arm/xen.txt > > @@ -15,6 +15,26 @@ the following properties: > > - interrupts: the interrupt used by Xen to inject event notifications. > > A GIC node is also required. > > > > +To support UEFI on Xen ARM virtual platforms, Xen populates the FDT "uefi" node > > +under /hypervisor with following parameters: > > + > > +________________________________________________________________________________ > > +Name | Size | Description > > +================================================================================ > > +xen,uefi-system-table | 64-bit | Guest physical address of the UEFI System > > + | | Table. > > +-------------------------------------------------------------------------------- > > +xen,uefi-mmap-start | 64-bit | Guest physical address of the UEFI memory > > + | | map. > > +-------------------------------------------------------------------------------- > > +xen,uefi-mmap-size | 32-bit | Size in bytes of the UEFI memory map > > + | | pointed to in previous entry. > > +-------------------------------------------------------------------------------- > > +xen,uefi-mmap-desc-size | 32-bit | Size in bytes of each entry in the UEFI > > + | | memory map. > > +-------------------------------------------------------------------------------- > > +xen,uefi-mmap-desc-ver | 32-bit | Version of the mmap descriptor format. > > +-------------------------------------------------------------------------------- > > > > Example (assuming #address-cells = <2> and #size-cells = <2>): > > > > @@ -22,4 +42,18 @@ hypervisor { > > compatible = "xen,xen-4.3", "xen,xen"; > > reg = <0 0xb0000000 0 0x20000>; > > interrupts = <1 15 0xf08>; > > + uefi { > > + xen,uefi-system-table = <0xXXXXXXXX>; > > + xen,uefi-mmap-start = <0xXXXXXXXX>; > > + xen,uefi-mmap-size = <0xXXXXXXXX>; > > + xen,uefi-mmap-desc-size = <0xXXXXXXXX>; > > + xen,uefi-mmap-desc-ver = <0xXXXXXXXX>; > > + }; > > }; > > + > > +The format and meaning of these "xen,uefi-*" parameters are similar to those in > > +Documentation/arm/uefi.txt which are used by normal UEFI. But to distinguish > > +from normal UEFI, for Xen ARM virtual platforms it needs to introduce a Xen > > +specific UEFI which requires Xen hypervisor to provide hypercalls for Dom0 to > > +make use of the runtime services. Therefore, it defines these parameters under > > +/hypervisor node. > > Please replace the paragraph with the following which mentions > include/xen/interface/platform.h and improves the wording: > > "The format and meaning of the "xen,uefi-*" parameters are similar to > those in Documentation/arm/uefi.txt, which are provided by the regular > UEFI stub. However they differ because they are provided by the Xen > hypervisor, together with a set of UEFI runtime services implemented via > hypercalls, see include/xen/interface/platform.h." I would prefer if we didn't refer to Linux paths here, for the usual rationale of keeping bindings distinct from Linux implementation details. Could we either drop the "see include/xen/interface/platform.h" part, or refer to some Xen documentation? Thanks, Mark. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html