[Xen-devel] [PATCH v2 12/16] ARM: Xen: Document UEFI support on Xen ARM virtual platforms

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

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 <shannon.zhao@xxxxxxxxxx>
---
 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



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