[PATCH v2 12/16] ARM: Xen: Document UEFI support on Xen ARM virtual platforms
From: Shannon Zhao <hidden>
Date: 2016-01-15 06:56:54
Also in:
linux-arm-kernel, linux-efi, lkml
Subsystem:
open firmware and flattened device tree bindings, the rest · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
From: Shannon Zhao <redacted> Add a "uefi" node under /hypervisor node in FDT, then Linux kernel could scan this to get the UEFI information. Signed-off-by: Shannon Zhao <redacted> --- Documentation/devicetree/bindings/arm/xen.txt | 42 +++++++++++++++++++++++++++ 1 file changed, 42 insertions(+)
diff --git a/Documentation/devicetree/bindings/arm/xen.txt b/Documentation/devicetree/bindings/arm/xen.txt
index 0f7b9c2..fbc17ae 100644
--- a/Documentation/devicetree/bindings/arm/xen.txt
+++ b/Documentation/devicetree/bindings/arm/xen.txt@@ -15,6 +15,36 @@ the following properties: - interrupts: the interrupt used by Xen to inject event notifications. A GIC node is also required. +To support UEFI on Xen ARM virtual platforms, Xen pupulates 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. +-------------------------------------------------------------------------------- + +Below is the format of the mmap descriptor. +typedef struct { + u32 type; + u32 pad; + u64 phys_addr; + u64 virt_addr; + u64 num_pages; + u64 attribute; +} efi_memory_desc_t; Example (assuming #address-cells = <2> and #size-cells = <2>):
@@ -22,4 +52,16 @@ 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>; + }; }; + +These "xen,uefi-*" parameters are similar to those in Documentation/arm/uefi.txt +which are used by normal UEFI. But to Xen ARM virtual platforms, it needs to +introduce a Xen specific UEFI and it doesn't want to mix with normal UEFI. +Therefore, it defines these parameters under /hypervisor node.
--
2.0.4