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MIPS: Cavium OCTEON multiplier state preservation. 

For OCTEON, implement a save and restore of the multiplier state
across context switches.

Signed-off-by: Tomaso Paoletti <tpaoletti@caviumnetworks.com>
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney 2008-12-11 15:33:33 -08:00 committed by Ralf Baechle
parent ddcdb1b4a4
commit 2a219b0eaa
1 changed files with 17 additions and 0 deletions
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17
arch/mips/include/asm/stackframe.h
View File

@ -194,6 +194,19 @@
LONG_S $31, PT_R31(sp)
ori $28, sp, _THREAD_MASK
xori $28, _THREAD_MASK
#ifdef CONFIG_CPU_CAVIUM_OCTEON
.set mips64
pref 0, 0($28) /* Prefetch the current pointer */
pref 0, PT_R31(sp) /* Prefetch the $31(ra) */
/* The Octeon multiplier state is affected by general multiply
instructions. It must be saved before and kernel code might
corrupt it */
jal octeon_mult_save
LONG_L v1, 0($28) /* Load the current pointer */
/* Restore $31(ra) that was changed by the jal */
LONG_L ra, PT_R31(sp)
pref 0, 0(v1) /* Prefetch the current thread */
#endif
.set pop
.endm
@ -324,6 +337,10 @@
DVPE 5 # dvpe a1
jal mips_ihb
#endif /* CONFIG_MIPS_MT_SMTC */
#ifdef CONFIG_CPU_CAVIUM_OCTEON
/* Restore the Octeon multiplier state */
jal octeon_mult_restore
#endif
mfc0 a0, CP0_STATUS
ori a0, STATMASK
xori a0, STATMASK