[Xen-changelog] [xen master] xen/arm64: Document the register mapping aarch64 <-> aarch32

[patchbot@xxxxxxx]

commit 1f38c6603c7160a2ee6b714293bf936f4f371b73
Author:     Julien Grall <julien.grall@xxxxxxxxxx>
AuthorDate: Fri Dec 11 15:28:21 2015 +0000
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Tue Jan 5 11:49:39 2016 +0000

    xen/arm64: Document the register mapping aarch64 <-> aarch32
    
    The mapping between aarch64 and aarch32 has not been chosen in random.
    It's based on D1.20.1 in ARM DDI 0487A.d.
    
    The section is not obvious to find in the spec, so make it clear for the
    anyone else.
    
    Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/include/asm-arm/arm64/processor.h |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/xen/include/asm-arm/arm64/processor.h 
b/xen/include/asm-arm/arm64/processor.h
index 3a9c0cd..fef35a5 100644
--- a/xen/include/asm-arm/arm64/processor.h
+++ b/xen/include/asm-arm/arm64/processor.h
@@ -15,7 +15,12 @@
 /* On stack VCPU state */
 struct cpu_user_regs
 {
-    /*         Aarch64       Aarch32 */
+    /*
+     * The mapping AArch64 <-> AArch32 is based on D1.20.1 in ARM DDI
+     * 0487A.d.
+     *
+     *         AArch64       AArch32
+     */
     __DECL_REG(x0,           r0/*_usr*/);
     __DECL_REG(x1,           r1/*_usr*/);
     __DECL_REG(x2,           r2/*_usr*/);
--
generated by git-patchbot for /home/xen/git/xen.git#master

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