[PATCH] xen/arm: Using unsigned long for arm64 MPIDR mask

[Wei Chen <wei.chen@xxxxxxx>]

Curretly, Xen is using UINT32 for MPIDR mask to retrieve
affinity[0,1,2,3] values for MPIDR_EL1 register. The value
of MPIDR_EL1 is 64-bit unsigned long. The operation of 64-bit
and 32-bit integers are compiler related. This means the value
is unpredictable.

For example, when we are using MPIDR_AFF0_MASK to get
cluster_id from a 64-bit integer in gic-v3 driver:
uint64_t cluster_id = cpu_logical_map(cpu) & ~MPIDR_AFF0_MASK;

When MPIDR_AFF0_MASK is UINT32, compiler output:
    f7c: 92785c16 and x22, x0, #0xffffff00
When MPIDR_AFF0_MASK is unsigned long, compiler output:
    f88: 9278dc75 and x21, x3, #0xffffffffffffff00

If we have a cpu_logical_map(cpu)= 0x1,00000000. We except
to get a cluster_id 1, but with UINT32 MPIDR_AFF0_MASK, we
will get 0.

So, in this patch, we force aarch64 to use unsigned long
as MPIDR mask to avoid such unpredictable operations.

Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
---
 xen/include/asm-arm/processor.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/xen/include/asm-arm/processor.h b/xen/include/asm-arm/processor.h
index 87c8136022..5c1768cdec 100644
--- a/xen/include/asm-arm/processor.h
+++ b/xen/include/asm-arm/processor.h
@@ -75,11 +75,11 @@
 
 /* MPIDR Multiprocessor Affinity Register */
 #define _MPIDR_UP           (30)
-#define MPIDR_UP            (_AC(1,U) << _MPIDR_UP)
+#define MPIDR_UP            (_AC(1,UL) << _MPIDR_UP)
 #define _MPIDR_SMP          (31)
-#define MPIDR_SMP           (_AC(1,U) << _MPIDR_SMP)
+#define MPIDR_SMP           (_AC(1,UL) << _MPIDR_SMP)
 #define MPIDR_AFF0_SHIFT    (0)
-#define MPIDR_AFF0_MASK     (_AC(0xff,U) << MPIDR_AFF0_SHIFT)
+#define MPIDR_AFF0_MASK     (_AC(0xff,UL) << MPIDR_AFF0_SHIFT)
 #ifdef CONFIG_ARM_64
 #define MPIDR_HWID_MASK     _AC(0xff00ffffff,UL)
 #else
-- 
2.25.1