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| author | Shannon Zhao <shannon.zhao@linaro.org> | 2016-04-07 20:03:30 +0800 |
|---|---|---|
| committer | David Vrabel <david.vrabel@citrix.com> | 2016-07-06 10:34:45 +0100 |
| commit | 9d2f145fce926ac35f1f602ed87bc61547cc6da5 (patch) | |
| tree | e638b3715b17b2e168dd2d25460e60c9db8b004a | |
| parent | 9b08aaa3199a4dffca73c7cdec813b483b5b2d3b (diff) | |
| download | linux-9d2f145fce926ac35f1f602ed87bc61547cc6da5.tar.bz2 | |
ARM: Xen: Document UEFI support on Xen ARM virtual platforms
Add a "uefi" node under /hypervisor node in FDT, then Linux kernel could
scan this to get the UEFI information.
CC: Rob Herring <robh@kernel.org>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Tested-by: Julien Grall <julien.grall@arm.com>
| -rw-r--r-- | Documentation/devicetree/bindings/arm/xen.txt | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/arm/xen.txt b/Documentation/devicetree/bindings/arm/xen.txt index 0f7b9c2109f8..c9b9321434ea 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. |