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ARM: Xen: Document UEFI support on Xen ARM virtual platforms

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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>
This commit is contained in:
Shannon Zhao 2016-04-07 20:03:30 +08:00 committed by David Vrabel
parent 9b08aaa319
commit 9d2f145fce
1 changed files with 35 additions and 0 deletions
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35
Documentation/devicetree/bindings/arm/xen.txt
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@ -11,10 +11,32 @@ the following properties:
memory where the grant table should be mapped to, using an memory where the grant table should be mapped to, using an
HYPERVISOR_memory_op hypercall. The memory region is large enough to map 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()). 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. - interrupts: the interrupt used by Xen to inject event notifications.
A GIC node is also required. 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>): Example (assuming #address-cells = <2> and #size-cells = <2>):
@ -22,4 +44,17 @@ hypervisor {
compatible = "xen,xen-4.3", "xen,xen"; compatible = "xen,xen-4.3", "xen,xen";
reg = <0 0xb0000000 0 0x20000>; reg = <0 0xb0000000 0 0x20000>;
interrupts = <1 15 0xf08>; 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.