ia64/pv_ops/xen: paravirtualize read/write ar.itc and ar.itm
paravirtualize ar.itc and ar.itm in order to support save/restore.
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/include/asm/xen/inst.h b/arch/ia64/include/asm/xen/inst.h
index e8e01b2..90537dc 100644
--- a/arch/ia64/include/asm/xen/inst.h
+++ b/arch/ia64/include/asm/xen/inst.h
@@ -113,6 +113,27 @@
.endm
#define MOV_FROM_PSR(pred, reg, clob) __MOV_FROM_PSR pred, reg, clob
+/* assuming ar.itc is read with interrupt disabled. */
+#define MOV_FROM_ITC(pred, pred_clob, reg, clob) \
+(pred) movl clob = XSI_ITC_OFFSET; \
+ ;; \
+(pred) ld8 clob = [clob]; \
+(pred) mov reg = ar.itc; \
+ ;; \
+(pred) add reg = reg, clob; \
+ ;; \
+(pred) movl clob = XSI_ITC_LAST; \
+ ;; \
+(pred) ld8 clob = [clob]; \
+ ;; \
+(pred) cmp.geu.unc pred_clob, p0 = clob, reg; \
+ ;; \
+(pred_clob) add reg = 1, clob; \
+ ;; \
+(pred) movl clob = XSI_ITC_LAST; \
+ ;; \
+(pred) st8 [clob] = reg
+
#define MOV_TO_IFA(reg, clob) \
movl clob = XSI_IFA; \