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| author | Gautham R. Shenoy <ego@linux.vnet.ibm.com> | 2015-08-05 12:38:31 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2015-08-14 15:58:28 +1000 |
| commit | e63dbd16ab7be41f5b66a70f1082242d76dd21d7 (patch) | |
| tree | 55996fb7acda110d3a4dd4fedb0673ed259f1607 /arch/powerpc/include/asm/reg.h | |
| parent | 9afac933433ca71e0f78958a1286a8d3b9de5582 (diff) | |
| download | op-kernel-dev-e63dbd16ab7be41f5b66a70f1082242d76dd21d7.zip op-kernel-dev-e63dbd16ab7be41f5b66a70f1082242d76dd21d7.tar.gz | |
powerpc: Add an inline function to update POWER8 HID0
Section 3.7 of Version 1.2 of the Power8 Processor User's Manual
prescribes that updates to HID0 be preceded by a SYNC instruction and
followed by an ISYNC instruction (Page 91).
Create an inline function name update_power8_hid0() which follows this
recipe and invoke it from the static split core path.
Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Reviewed-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Tested-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/reg.h')
| -rw-r--r-- | arch/powerpc/include/asm/reg.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index bb27588..aa1cc5f0 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -1280,6 +1280,15 @@ struct pt_regs; extern void ppc_save_regs(struct pt_regs *regs); +static inline void update_power8_hid0(unsigned long hid0) +{ + /* + * The HID0 update on Power8 should at the very least be + * preceded by a a SYNC instruction followed by an ISYNC + * instruction + */ + asm volatile("sync; mtspr %0,%1; isync":: "i"(SPRN_HID0), "r"(hid0)); +} #endif /* __ASSEMBLY__ */ #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_REG_H */ |
