From mboxrd@z Thu Jan 1 00:00:00 1970 From: Julien Grall Subject: Re: [PATCH v7 13/17] ARM: Xen: Document UEFI support on Xen ARM virtual platforms Date: Tue, 29 Mar 2016 18:21:35 +0100 Message-ID: <56FAB99F.5030606@arm.com> References: <1458830676-27075-1-git-send-email-shannon.zhao@linaro.org> <1458830676-27075-14-git-send-email-shannon.zhao@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1458830676-27075-14-git-send-email-shannon.zhao-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Shannon Zhao , linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, stefano.stabellini-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org, david.vrabel-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, catalin.marinas-5wv7dgnIgG8@public.gmane.org, will.deacon-5wv7dgnIgG8@public.gmane.org, peter.huangpeng-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, xen-devel-GuqFBffKawuEi8DpZVb4nw@public.gmane.org, zhaoshenglong-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, Rob Herring List-Id: devicetree@vger.kernel.org Hi Shannon, On 24/03/16 14:44, Shannon Zhao wrote: > Add a "uefi" node under /hypervisor node in FDT, then Linux kernel could > scan this to get the UEFI information. > > CC: Rob Herring > Signed-off-by: Shannon Zhao > Acked-by: Rob Herring > Reviewed-by: Stefano Stabellini > --- > Documentation/devicetree/bindings/arm/xen.txt | 33 +++++++++++++++++++++++++++ > 1 file changed, 33 insertions(+) > > diff --git a/Documentation/devicetree/bindings/arm/xen.txt b/Documentation/devicetree/bindings/arm/xen.txt > index 0f7b9c2..6f83f76 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. You need to update the recent of the document based on the changes you made in the Xen one. See [1]. > +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 +42,17 @@ 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 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 > +http://xenbits.xen.org/docs/unstable/hypercall/x86_64/include,public,platform.h.html. > Regards, [1] http://lists.xenproject.org/archives/html/xen-devel/2016-03/msg03413.html -- Julien Grall