1 files changed, 20 insertions, 0 deletions

diff --git a/arch/ia64/kernel/patch.c b/arch/ia64/kernel/patch.c
index bc11bb096f58..e796e29f8e15 100644
--- a/arch/ia64/kernel/patch.c
+++ b/arch/ia64/kernel/patch.c
@@ -195,3 +195,23 @@ ia64_patch_gate (void)
         ia64_patch_vtop(START(vtop), END(vtop));
         ia64_patch_mckinley_e9(START(mckinley_e9), END(mckinley_e9));
 }
+
+void ia64_patch_phys_stack_reg(unsigned long val)
+{
+        s32 * offp = (s32 *) __start___phys_stack_reg_patchlist;
+        s32 * end = (s32 *) __end___phys_stack_reg_patchlist;
+        u64 ip, mask, imm;
+
+        /* see instruction format A4: adds r1 = imm13, r3 */
+        mask = (0x3fUL << 27) | (0x7f << 13);
+        imm = (((val >> 7) & 0x3f) << 27) | (val & 0x7f) << 13;
+
+        while (offp < end) {
+                ip = (u64) offp + *offp;
+                ia64_patch(ip, mask, imm);
+                ia64_fc(ip);
+                ++offp;
+        }
+        ia64_sync_i();
+        ia64_srlz_i();
+}