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powerpc/time: refactor MFTB() to limit number of ifdefs

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The 8xx cannot access the TBL and TBU registers using mfspr/mtspr
It must be accessed using mftb/mftbu

Due to this, there is a number of places with #ifdef CONFIG_8xx

This patch defines new macros MFTBL(x) and MFTBU(x) on the same model
as MFTB(x) and tries to make use of them as much as possible.

In arch/powerpc/include/asm/timex.h, we also remove the ifdef
for the asm() operands as the compiler doesn't mind unused operands

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
2017-08-08 13:58:50 +02:00
committed by Michael Ellerman
parent de41ef6e4d
commit 72e4b2cdf0
5 changed files with 25 additions and 35 deletions
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12
arch/powerpc/kernel/vdso32/gettimeofday.S
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@@ -232,15 +232,9 @@ __do_get_tspec:
lwz r6,(CFG_TB_ORIG_STAMP+4)(r9)
/* Get a stable TB value */
#ifdef CONFIG_8xx
2: mftbu r3
mftbl r4
mftbu r0
#else
2: mfspr r3, SPRN_TBRU
mfspr r4, SPRN_TBRL
mfspr r0, SPRN_TBRU
#endif
2: MFTBU(r3)
MFTBL(r4)
MFTBU(r0)
cmplw cr0,r3,r0
bne- 2b