Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932613AbcDAPvg (ORCPT ); Fri, 1 Apr 2016 11:51:36 -0400 Received: from mail-pa0-f52.google.com ([209.85.220.52]:34118 "EHLO mail-pa0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932601AbcDAPv2 (ORCPT ); Fri, 1 Apr 2016 11:51:28 -0400 From: Shannon Zhao To: linux-arm-kernel@lists.infradead.org, stefano.stabellini@citrix.com Cc: david.vrabel@citrix.com, devicetree@vger.kernel.org, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, catalin.marinas@arm.com, will.deacon@arm.com, julien.grall@arm.com, peter.huangpeng@huawei.com, xen-devel@lists.xen.org, zhaoshenglong@huawei.com, shannon.zhao@linaro.org, Rob Herring Subject: [PATCH v10 13/17] ARM: Xen: Document UEFI support on Xen ARM virtual platforms Date: Fri, 1 Apr 2016 23:49:11 +0800 Message-Id: <1459525755-36968-14-git-send-email-shannon.zhao@linaro.org> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1459525755-36968-1-git-send-email-shannon.zhao@linaro.org> References: <1459525755-36968-1-git-send-email-shannon.zhao@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3294 Lines: 68 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 | 35 +++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/Documentation/devicetree/bindings/arm/xen.txt b/Documentation/devicetree/bindings/arm/xen.txt index 0f7b9c2..c9b9321 100644 --- a/Documentation/devicetree/bindings/arm/xen.txt +++ b/Documentation/devicetree/bindings/arm/xen.txt @@ -11,10 +11,32 @@ the following properties: memory where the grant table should be mapped to, using an HYPERVISOR_memory_op hypercall. The memory region is large enough to map the whole grant table (it is larger or equal to gnttab_max_grant_frames()). + This property is unnecessary when booting Dom0 using ACPI. - interrupts: the interrupt used by Xen to inject event notifications. A GIC node is also required. + This property is unnecessary when booting Dom0 using ACPI. +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 +44,17 @@ 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. -- 2.1.4