MIPS: OCTEON: Use correct instruction to read 64-bit COP0 register

Use dmfc0/dmtc0 instructions for reading CvmMemCtl COP0 register,
its a 64-bit wide.

Signed-off-by: Chandrakala Chavva <cchavva@caviumnetworks.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@auriga.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: David Daney <david.daney@cavium.com>
Patchwork: https://patchwork.linux-mips.org/patch/8936/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/kernel/octeon_switch.S b/arch/mips/kernel/octeon_switch.S
index 590ca2d..f0a699d 100644 (file)
--- a/arch/mips/kernel/octeon_switch.S
+++ b/arch/mips/kernel/octeon_switch.S
@@ -80,7 +80,7 @@
 1:
 #if CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE > 0
        /* Check if we need to store CVMSEG state */
-       mfc0    t0, $11,7       /* CvmMemCtl */
+       dmfc0   t0, $11,7       /* CvmMemCtl */
        bbit0   t0, 6, 3f       /* Is user access enabled? */
 
        /* Store the CVMSEG state */
@@ -104,9 +104,9 @@
        .set reorder
 
        /* Disable access to CVMSEG */
-       mfc0    t0, $11,7       /* CvmMemCtl */
+       dmfc0   t0, $11,7       /* CvmMemCtl */
        xori    t0, t0, 0x40    /* Bit 6 is CVMSEG user enable */
-       mtc0    t0, $11,7       /* CvmMemCtl */
+       dmtc0   t0, $11,7       /* CvmMemCtl */
 #endif
 3: