powerpc/85xx: Add support for link stack & STAC on e5500

The e5500 has a link register stack and segment target address cache.
Its safe to enable these bits on older e500 cores as the bits are
implemented in the register.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 9ec319a..844552c 100644 (file)
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -534,9 +534,11 @@
 #define SPRN_MCSRR0    0x23a   /* Machine Check Save and Restore Register 0 */
 #define SPRN_MCSRR1    0x23b   /* Machine Check Save and Restore Register 1 */
 #define SPRN_BUCSR     0x3f5   /* Branch Control and Status Register */
+#define          BUCSR_STAC_EN 0x01000000      /* Segment target addr cache enable */
+#define          BUCSR_LS_EN   0x00400000      /* Link stack enable */
 #define          BUCSR_BBFI    0x00000200      /* Branch buffer flash invalidate */
 #define          BUCSR_BPEN    0x00000001      /* Branch prediction enable */
-#define   BUCSR_ENABLE (BUCSR_BBFI|BUCSR_BPEN)
+#define   BUCSR_ENABLE (BUCSR_STAC_EN|BUCSR_LS_EN|BUCSR_BBFI|BUCSR_BPEN)
 #define SPRN_BBEAR     0x201   /* Branch Buffer Entry Address Register */
 #define SPRN_BBTAR     0x202   /* Branch Buffer Target Address Register */
 #define SPRN_PID1      0x279   /* Process ID Register 1 */