[rtems commit] score: Add processor mask to/from cpu_set_t

[Sebastian Huber]

Module:    rtems
Branch:    master
Commit:    7a5e4d94774d2cbfeb96664ed7295f20b8618fe8
Changeset: http://git.rtems.org/rtems/commit/?id=7a5e4d94774d2cbfeb96664ed7295f20b8618fe8

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Mon Jul  3 13:14:35 2017 +0200

score: Add processor mask to/from cpu_set_t

Update #3059.

---

 cpukit/score/Makefile.am                         |  1 +
 cpukit/score/include/rtems/score/processormask.h | 52 +++++++++++++++-
 cpukit/score/src/processormaskcopy.c             | 75 ++++++++++++++++++++++++
 3 files changed, 126 insertions(+), 2 deletions(-)

diff --git a/cpukit/score/Makefile.am b/cpukit/score/Makefile.am
index 46b4417..1ac7c15 100644
--- a/cpukit/score/Makefile.am
+++ b/cpukit/score/Makefile.am
@@ -354,6 +354,7 @@ libscore_a_SOURCES += src/semaphore.c
 libscore_a_SOURCES += src/smpbarrierwait.c
 libscore_a_SOURCES += src/kern_tc.c
 libscore_a_SOURCES += src/libatomic.c
+libscore_a_SOURCES += src/processormaskcopy.c
 
 EXTRA_DIST = src/Unlimited.txt
 
diff --git a/cpukit/score/include/rtems/score/processormask.h b/cpukit/score/include/rtems/score/processormask.h
index ebf19ca..27c35d3 100644
--- a/cpukit/score/include/rtems/score/processormask.h
+++ b/cpukit/score/include/rtems/score/processormask.h
@@ -25,8 +25,7 @@
 
 #include <rtems/score/cpu.h>
 
-#include <sys/_bitset.h>
-#include <sys/bitset.h>
+#include <sys/cpuset.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -105,6 +104,55 @@ RTEMS_INLINE_ROUTINE uint32_t _Processor_mask_To_uint32_t(
   return (uint32_t) (bits >> (32 * (index % _BITSET_BITS) / 32));
 }
 
+typedef enum {
+  PROCESSOR_MASK_COPY_LOSSLESS,
+  PROCESSOR_MASK_COPY_PARTIAL_LOSS,
+  PROCESSOR_MASK_COPY_COMPLETE_LOSS,
+  PROCESSOR_MASK_COPY_INVALID_SIZE
+} Processor_mask_Copy_status;
+
+RTEMS_INLINE_ROUTINE bool _Processor_mask_Is_at_most_partial_loss(
+  Processor_mask_Copy_status status
+)
+{
+  return (unsigned int) status <= PROCESSOR_MASK_COPY_PARTIAL_LOSS;
+}
+
+Processor_mask_Copy_status _Processor_mask_Copy(
+  long       *dst,
+  size_t      dst_size,
+  const long *src,
+  size_t      src_size
+);
+
+RTEMS_INLINE_ROUTINE Processor_mask_Copy_status _Processor_mask_To_cpu_set_t(
+  const Processor_mask *src,
+  size_t                dst_size,
+  cpu_set_t            *dst
+)
+{
+  return _Processor_mask_Copy(
+    &dst->__bits[ 0 ],
+    dst_size,
+    &src->__bits[ 0 ],
+    sizeof( *src )
+  );
+}
+
+RTEMS_INLINE_ROUTINE Processor_mask_Copy_status _Processor_mask_From_cpu_set_t(
+  Processor_mask  *dst,
+  size_t           src_size,
+  const cpu_set_t *src
+)
+{
+  return _Processor_mask_Copy(
+    &dst->__bits[ 0 ],
+    sizeof( *dst ),
+    &src->__bits[ 0 ],
+    src_size
+  );
+}
+
 /** @} */
 
 #ifdef __cplusplus
diff --git a/cpukit/score/src/processormaskcopy.c b/cpukit/score/src/processormaskcopy.c
new file mode 100644
index 0000000..bf8082d
--- /dev/null
+++ b/cpukit/score/src/processormaskcopy.c
@@ -0,0 +1,75 @@
+/**
+ * @file
+ *
+ * @brief Processor Mask Implementation
+ *
+ * @ingroup ScoreProcessorMask
+ */
+
+/*
+ * Copyright (c) 2017 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Dornierstr. 4
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems at embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/score/processormask.h>
+
+Processor_mask_Copy_status _Processor_mask_Copy(
+  long       *dst,
+  size_t      dst_size,
+  const long *src,
+  size_t      src_size
+)
+{
+  long inclusive = 0;
+  long exclusive = 0;
+
+  if ( ( dst_size | src_size ) % sizeof( long ) != 0 ) {
+    return PROCESSOR_MASK_COPY_INVALID_SIZE;
+  }
+
+  while ( dst_size > 0 && src_size > 0 ) {
+    long bits = *src;
+
+    inclusive |= bits;
+    *dst = bits;
+    ++dst;
+    ++src;
+    dst_size -= sizeof( long );
+    src_size -= sizeof( long );
+  }
+
+  while ( dst_size > 0 ) {
+    *dst = 0;
+    ++dst;
+    dst_size -= sizeof( long );
+  }
+
+  while ( src_size > 0 ) {
+    exclusive |= *src;
+    ++src;
+    src_size -= sizeof( long );
+  }
+
+  if ( exclusive != 0 ) {
+    if ( inclusive != 0 ) {
+      return PROCESSOR_MASK_COPY_PARTIAL_LOSS;
+    } else {
+      return PROCESSOR_MASK_COPY_COMPLETE_LOSS;
+    }
+  }
+
+  return PROCESSOR_MASK_COPY_LOSSLESS;
+}