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MIPS: Move cop2 save/restore to switch_to()

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Move the common code for saving and restoring platform specific COP2
registers to switch_to(). This will make supporting new platforms (like
Netlogic XLP) easier.

The platform specific COP2 definitions are to be specified in
asm/processor.h and in asm/cop2.h.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Cc: ddaney.cavm@gmail.com
Patchwork: https://patchwork.linux-mips.org/patch/5411/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Jayachandran C
2013-06-10 06:30:00 +00:00
committed by Ralf Baechle
parent 79f8511c83
commit 2c952e06e4
4 changed files with 44 additions and 39 deletions
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27
arch/mips/kernel/octeon_switch.S
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@@ -40,33 +40,6 @@
cpu_save_nonscratch a0
LONG_S ra, THREAD_REG31(a0)
/* check if we need to save COP2 registers */
PTR_L t2, TASK_THREAD_INFO(a0)
LONG_L t0, ST_OFF(t2)
bbit0 t0, 30, 1f
/* Disable COP2 in the stored process state */
li t1, ST0_CU2
xor t0, t1
LONG_S t0, ST_OFF(t2)
/* Enable COP2 so we can save it */
mfc0 t0, CP0_STATUS
or t0, t1
mtc0 t0, CP0_STATUS
/* Save COP2 */
daddu a0, THREAD_CP2
jal octeon_cop2_save
dsubu a0, THREAD_CP2
/* Disable COP2 now that we are done */
mfc0 t0, CP0_STATUS
li t1, ST0_CU2
xor t0, t1
mtc0 t0, CP0_STATUS
1:
#if CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE > 0
/* Check if we need to store CVMSEG state */
mfc0 t0, $11,7 /* CvmMemCtl */