implement 'wait' instruction

Commit Message

Zhenyu Wang June 29, 2010, 3:04 a.m. UTC

None

Patch

diff --git a/src/mesa/drivers/dri/i965/brw_eu.h b/src/mesa/drivers/dri/i965/brw_eu.h
index a6fcd83..3a01000 100644
--- a/src/mesa/drivers/dri/i965/brw_eu.h
+++ b/src/mesa/drivers/dri/i965/brw_eu.h
@@ -520,6 +520,20 @@  static INLINE struct brw_reg brw_acc_reg( void )
 		       0);
 }
 
+static INLINE struct brw_reg brw_notification_1_reg(void)
+{
+
+   return brw_reg(BRW_ARCHITECTURE_REGISTER_FILE,
+		  BRW_ARF_NOTIFICATION_COUNT,
+		  1,
+		  BRW_REGISTER_TYPE_UD,
+		  BRW_VERTICAL_STRIDE_0,
+		  BRW_WIDTH_1,
+		  BRW_HORIZONTAL_STRIDE_0,
+		  BRW_SWIZZLE_XXXX,
+		  WRITEMASK_X);
+}
+
 
 static INLINE struct brw_reg brw_flag_reg( void )
 {
@@ -919,6 +933,8 @@  void brw_land_fwd_jump(struct brw_compile *p,
 
 void brw_NOP(struct brw_compile *p);
 
+void brw_WAIT(struct brw_compile *p);
+
 /* Special case: there is never a destination, execution size will be
  * taken from src0:
  */
diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
index 34dfe10..10e9ebc 100644
--- a/src/mesa/drivers/dri/i965/brw_eu_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c
@@ -906,6 +906,20 @@  void brw_CMP(struct brw_compile *p,
    }
 }
 
+/* Issue 'wait' instruction for n1, host could program MMIO
+   to wake up thread. */
+void brw_WAIT (struct brw_compile *p)
+{
+   struct brw_instruction *insn = next_insn(p, BRW_OPCODE_WAIT);
+   struct brw_reg src = brw_notification_1_reg();
+
+   brw_set_dest(insn, src);
+   brw_set_src0(insn, src);
+   brw_set_src1(insn, brw_null_reg());
+   insn->header.execution_size = 0; /* must */
+   insn->header.predicate_control = 0;
+   insn->header.compression_control = 0;
+}
 
 
 /***********************************************************************