2023-08-30 17:31:07 +02:00
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* Xen hypervisor device tree bindings
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Xen ARM virtual platforms shall have a top-level "hypervisor" node with
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the following properties:
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- compatible:
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compatible = "xen,xen-<version>", "xen,xen";
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where <version> is the version of the Xen ABI of the platform.
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- reg: specifies the base physical address and size of the regions in memory
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where the special resources should be mapped to, using an HYPERVISOR_memory_op
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hypercall.
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Region 0 is reserved for mapping grant table, it must be always present.
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The memory region is large enough to map the whole grant table (it is larger
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or equal to gnttab_max_grant_frames()).
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Regions 1...N are extended regions (unused address space) for mapping foreign
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GFNs and grants, they might be absent if there is nothing to expose.
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- interrupts: the interrupt used by Xen to inject event notifications.
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A GIC node is also required.
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To support UEFI on Xen ARM virtual platforms, Xen populates the FDT "uefi" node
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under /hypervisor with following parameters:
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________________________________________________________________________________
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Name | Size | Description
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================================================================================
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xen,uefi-system-table | 64-bit | Guest physical address of the UEFI System
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| | Table.
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--------------------------------------------------------------------------------
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xen,uefi-mmap-start | 64-bit | Guest physical address of the UEFI memory
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| | map.
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--------------------------------------------------------------------------------
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xen,uefi-mmap-size | 32-bit | Size in bytes of the UEFI memory map
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| | pointed to in previous entry.
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--------------------------------------------------------------------------------
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xen,uefi-mmap-desc-size | 32-bit | Size in bytes of each entry in the UEFI
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| | memory map.
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--------------------------------------------------------------------------------
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xen,uefi-mmap-desc-ver | 32-bit | Version of the mmap descriptor format.
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--------------------------------------------------------------------------------
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Example (assuming #address-cells = <2> and #size-cells = <2>):
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hypervisor {
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compatible = "xen,xen-4.3", "xen,xen";
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reg = <0 0xb0000000 0 0x20000>;
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interrupts = <1 15 0xf08>;
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uefi {
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xen,uefi-system-table = <0xXXXXXXXX>;
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xen,uefi-mmap-start = <0xXXXXXXXX>;
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xen,uefi-mmap-size = <0xXXXXXXXX>;
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xen,uefi-mmap-desc-size = <0xXXXXXXXX>;
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xen,uefi-mmap-desc-ver = <0xXXXXXXXX>;
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};
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};
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The format and meaning of the "xen,uefi-*" parameters are similar to those in
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2023-10-24 12:59:35 +02:00
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Documentation/arch/arm/uefi.rst, which are provided by the regular UEFI stub. However
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2023-08-30 17:31:07 +02:00
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they differ because they are provided by the Xen hypervisor, together with a set
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of UEFI runtime services implemented via hypercalls, see
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http://xenbits.xen.org/docs/unstable/hypercall/x86_64/include,public,platform.h.html.
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