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powerpc/32: add helper to write into segment registers

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

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2019-02-21 19:08:44 +00:00 committed by Michael Ellerman
parent df25f86390
commit 02d5d13b45
1 changed files with 5 additions and 0 deletions
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5
arch/powerpc/include/asm/reg.h
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@ -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")