[RFC PATCH v2 09/11] powerpc/32: add helper to write into segment registers

From: Christophe Leroy
Date: Wed Nov 28 2018 - 04:27:25 EST


This patch add an helper which wraps 'mtsrin' instruction
to write into segment registers.

Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxx>
---
arch/powerpc/include/asm/reg.h | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index d9598e6790d8..6b5d2a61af5a 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -1424,6 +1424,11 @@ static inline void msr_check_and_clear(unsigned long bits)
#define mfsrin(v) ({unsigned int rval; \
asm volatile("mfsrin %0,%1" : "=r" (rval) : "r" (v)); \
rval;})
+
+static inline void mtsrin(u32 val, u32 idx)
+{
+ asm volatile("mtsrin %0, %1" : : "r" (val), "r" (idx));
+}
#endif

#define proc_trap() asm volatile("trap")
--
2.13.3