Code optimizations.

   - Reduce DCBZ and ICBI calls in memory copy and init functions.
   - Reduce strlen calls in trace.
   - Set thread to low priority while waiting on in-kernel barrier.

Change-Id: Ic9c23b1e26797ff393e5862819830de60554747e
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/871
Tested-by: Jenkins Server
Reviewed-by: Douglas R. Gilbert <dgilbert@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
Reviewed-by: Brian H. Horton <brianh@linux.ibm.com>
Reviewed-by: A. Patrick Williams III <iawillia@us.ibm.com>

1 files changed, 27 insertions, 15 deletions

diff --git a/src/include/arch/ppc.H b/src/include/arch/ppc.H
index ae70f3547..77122be0d 100644
--- a/src/include/arch/ppc.H
+++ b/src/include/arch/ppc.H
@@ -258,21 +258,33 @@ inline void doze()
     asm volatile("doze");
 }
 
-/** @brief  This is a special assembler instruction that is a nop on 
+ALWAYS_INLINE
+inline size_t getCacheLineBytes()
+{
+    return 128;
+}
+
+ALWAYS_INLINE
+inline size_t getCacheLineWords()
+{
+    return getCacheLineBytes() / sizeof(uint64_t);
+}
+
+/** @brief  This is a special assembler instruction that is a nop on
  *  regular hardware, but has special meaning to Simics.  Code that
- *  executes this instruction in Simics will cause a "hap," a 
+ *  executes this instruction in Simics will cause a "hap," a
  *  Simics term.  If there is no hap handler registered, and magic
  *  breakpoints have not been enabled with
- *      simics> enable-magic-breakpoint 
- *  then this instruction is also a nop in Simics. 
- * 
+ *      simics> enable-magic-breakpoint
+ *  then this instruction is also a nop in Simics.
+ *
  *  If magic breakpoints are enabled, and there is no hap handler, then
  *  when Hostboot code executes this instruction in Simics, Simics will
  *  stop the simulation. (Prompt changes from running> to simics> )
- * 
+ *
  *  If a hap is registered, then Simics will call the hap handler.  Hap
  *  handlers are written in Python, and the best place for them is
- * 
+ *
  *     src/build/debug/simics-debug-framework.py
  *
  *  Sample code to register the hap handler:
@@ -282,17 +294,17 @@ inline void doze()
  *            print "Hit magic instruction ", arg
  *            # Or else stop the simulation...
  *            SIM_break_simulation( "Stopped at magic instruction" )
- * 
+ *
  *        # Register the magic instruction callback.
  *        SIM_hap_add_callback( "Core_Magic_Instruction", magic_instruction_callback, None )
  *
  *        # Better to register the Hostboot range 7000-7999
  *        # so that PHYP and others won't be affected.
  *        SIM_hap_add_callback_range( "Core_Magic_Instruction", magic_instruction_callback, None, 7000, 7999 )
- * 
+ *
  *  The argument n is an integer from 0..8191 which Simics passes to the hap
- *  handler in parameter 3, or "arg" in the sample code above. 
- */ 
+ *  handler in parameter 3, or "arg" in the sample code above.
+ */
 ALWAYS_INLINE
 inline void MAGIC_INSTRUCTION(int _n)
 {
@@ -303,10 +315,10 @@ inline void MAGIC_INSTRUCTION(int _n)
         "i" ((((n) >> 0) & 0xf) | 16));
 }
 
-// Arguments to MAGIC_INSTRUCTION(). 
-// To ensure they do not conflict with haps from other groups (PHYP 
+// Arguments to MAGIC_INSTRUCTION().
+// To ensure they do not conflict with haps from other groups (PHYP
 // for example), assign hap numbers in the range 7000..7999 (decimal).
-// Presently, the hap handler for magic instruction is found in 
+// Presently, the hap handler for magic instruction is found in
 // src/build/debug/simics-debug-framework.py
 // Jan 2012 Monte
 
@@ -314,7 +326,7 @@ enum
 {
     MAGIC_SHUTDOWN            =  7006, // KernelMisc::shutdown() called.
     MAGIC_BREAK               =  7007, // hard-code a breakpoint
-    MAGIC_CONTINUOUS_TRACE    =  7055  // extract mixed trace buffer 
+    MAGIC_CONTINUOUS_TRACE    =  7055  // extract mixed trace buffer
 };