[v2,08/15] powerpc/32: add helper to write into segment registers
diff mbox series

Message ID 597539a98a4ac4b01b465408a26fba6bc9935a97.1547132681.git.christophe.leroy@c-s.fr
State Superseded
Headers show
Series
  • powerpc/32s: Use BATs/LTLBs for STRICT_KERNEL_RWX
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snowpatch_ozlabs/checkpatch warning total: 0 errors, 1 warnings, 0 checks, 11 lines checked
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Commit Message

Christophe Leroy Jan. 10, 2019, 3:11 p.m. UTC
This patch add an helper which wraps 'mtsrin' instruction
to write into segment registers.

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

Patch
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diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 1c98ef1f2d5b..a70cbaf5c26f 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -1425,6 +1425,11 @@  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")