Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757889AbcC2RVl (ORCPT ); Tue, 29 Mar 2016 13:21:41 -0400 Received: from foss.arm.com ([217.140.101.70]:41964 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753103AbcC2RVj (ORCPT ); Tue, 29 Mar 2016 13:21:39 -0400 Subject: Re: [PATCH v7 13/17] ARM: Xen: Document UEFI support on Xen ARM virtual platforms To: Shannon Zhao , linux-arm-kernel@lists.infradead.org, stefano.stabellini@citrix.com, david.vrabel@citrix.com References: <1458830676-27075-1-git-send-email-shannon.zhao@linaro.org> <1458830676-27075-14-git-send-email-shannon.zhao@linaro.org> Cc: devicetree@vger.kernel.org, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, catalin.marinas@arm.com, will.deacon@arm.com, peter.huangpeng@huawei.com, xen-devel@lists.xen.org, zhaoshenglong@huawei.com, Rob Herring From: Julien Grall Message-ID: <56FAB99F.5030606@arm.com> Date: Tue, 29 Mar 2016 18:21:35 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1 MIME-Version: 1.0 In-Reply-To: <1458830676-27075-14-git-send-email-shannon.zhao@linaro.org> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3325 Lines: 75 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