1 files changed, 15 insertions, 0 deletions

diff --git a/include/asm-sparc64/tsb.h b/include/asm-sparc64/tsb.h
index 6e6768067e38..e82612cd9f33 100644
--- a/include/asm-sparc64/tsb.h
+++ b/include/asm-sparc64/tsb.h
@@ -243,6 +243,7 @@ extern struct tsb_phys_patch_entry __tsb_phys_patch, __tsb_phys_patch_end;
 #define KERNEL_TSB_SIZE_BYTES   (32 * 1024)
 #define KERNEL_TSB_NENTRIES     \
         (KERNEL_TSB_SIZE_BYTES / 16)
+#define KERNEL_TSB4M_NENTRIES   4096
 
         /* Do a kernel TSB lookup at tl>0 on VADDR+TAG, branch to OK_LABEL
          * on TSB hit.  REG1, REG2, REG3, and REG4 are used as temporaries
@@ -263,4 +264,18 @@ extern struct tsb_phys_patch_entry __tsb_phys_patch, __tsb_phys_patch_end;
         be,a,pt         %xcc, OK_LABEL; \
          mov            REG4, REG1;
 
+        /* This version uses a trick, the TAG is already (VADDR >> 22) so
+         * we can make use of that for the index computation.
+         */
+#define KERN_TSB4M_LOOKUP_TL1(TAG, REG1, REG2, REG3, REG4, OK_LABEL) \
+        sethi           %hi(swapper_4m_tsb), REG1; \
+        or              REG1, %lo(swapper_4m_tsb), REG1; \
+        and             TAG, (KERNEL_TSB_NENTRIES - 1), REG2; \
+        sllx            REG2, 4, REG2; \
+        add             REG1, REG2, REG2; \
+        KTSB_LOAD_QUAD(REG2, REG3); \
+        cmp             REG3, TAG; \
+        be,a,pt         %xcc, OK_LABEL; \
+         mov            REG4, REG1;
+
 #endif /* !(_SPARC64_TSB_H) */