[Xen-devel] [PATCH v4 4/4] xen/arm: arm64: Remove MPIDR multiprocessing extensions check

[Wei Chen <wei.chen@xxxxxxxxxx>]

In AArch32, MPIDR bit 31 is defined as multiprocessing extensions bit.
But in AArch64, this bit is always RES1. So the value check for this
bit is no longer necessary in AArch64.

Signed-off-by: Wei Chen <Wei.Chen@xxxxxxxxxx>
Reviewed-by: Julien Grall <julien.grall@xxxxxxx>
---
v3-->v4:
1. Add missed Reviewed-by tag.

v2--v3:
1. Fix a typo in commit messages.
2. Add Julien's Reviewed-by.

v1-->v2:
Make clear the status of MPIDR.SMP bit in AArch32 and AArch64.
---
 xen/arch/arm/arm64/head.S | 1 -
 1 file changed, 1 deletion(-)

diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S
index 3090beb..91e2817 100644
--- a/xen/arch/arm/arm64/head.S
+++ b/xen/arch/arm/arm64/head.S
@@ -267,7 +267,6 @@ common_start:
                                       * find that multiprocessor extensions are
                                       * present and the system is SMP  */
         mrs   x0, mpidr_el1
-        tbz   x0, _MPIDR_SMP, 1f     /* Multiprocessor extension not 
supported? */
         tbnz  x0, _MPIDR_UP, 1f      /* Uniprocessor system? */
 
         ldr   x13, =(~MPIDR_HWID_MASK)
-- 
2.7.4


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