[kvm-unit-tests PATCH 01/10] arm64: Provide read/write_sysreg_s

[Eric Auger]

From: Andrew Jones <address@hidden>

Sometimes we need to test access to system registers which are
missing assembler mnemonics.

Signed-off-by: Andrew Jones <address@hidden>
Reviewed-by: Alexandru Elisei <address@hidden>
---
 lib/arm64/asm/sysreg.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lib/arm64/asm/sysreg.h b/lib/arm64/asm/sysreg.h
index a03830b..a45eebd 100644
--- a/lib/arm64/asm/sysreg.h
+++ b/lib/arm64/asm/sysreg.h
@@ -38,6 +38,17 @@
        asm volatile("msr " xstr(r) ", %x0" : : "rZ" (__val));  \
 } while (0)
 
+#define read_sysreg_s(r) ({                                    \
+       u64 __val;                                              \
+       asm volatile("mrs_s %0, " xstr(r) : "=r" (__val));      \
+       __val;                                                  \
+})
+
+#define write_sysreg_s(v, r) do {                              \
+       u64 __val = (u64)v;                                     \
+       asm volatile("msr_s " xstr(r) ", %x0" : : "rZ" (__val));\
+} while (0)
+
 asm(
 "      .irp    
num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30\n"
 "      .equ    .L__reg_num_x\\num, \\num\n"
-- 
2.20.1