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| author | David Daney | 2008-12-12 00:33:33 +0100 |
|---|---|---|
| committer | Ralf Baechle | 2009-01-11 10:57:24 +0100 |
| commit | 2a219b0eaa7bb9f1a7dae4e8ac5b1bf68adab289 (patch) | |
| tree | c1b6be0b186db917c4d4ce3f5ed947e8d93a8ce1 | |
| parent | MIPS: Add SMP_ICACHE_FLUSH for the Cavium CPU family. (diff) | |
| download | kernel-qcow2-linux-2a219b0eaa7bb9f1a7dae4e8ac5b1bf68adab289.tar.gz kernel-qcow2-linux-2a219b0eaa7bb9f1a7dae4e8ac5b1bf68adab289.tar.xz kernel-qcow2-linux-2a219b0eaa7bb9f1a7dae4e8ac5b1bf68adab289.zip | |
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>
| -rw-r--r-- | arch/mips/include/asm/stackframe.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/mips/include/asm/stackframe.h b/arch/mips/include/asm/stackframe.h index 4c37c4e5f72e..db0fa7b5aeaf 100644 --- a/arch/mips/include/asm/stackframe.h +++ b/arch/mips/include/asm/stackframe.h @@ -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 |