From ac7d5ef06a6d6e8d84abbd1f0b82162725f98326 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Thu, 11 May 1995 17:39:37 +0000
Subject: Initial revision

---
 cpukit/score/include/rtems/score/context.h | 133 +++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 cpukit/score/include/rtems/score/context.h

(limited to 'cpukit/score/include/rtems/score/context.h')

diff --git a/cpukit/score/include/rtems/score/context.h b/cpukit/score/include/rtems/score/context.h
new file mode 100644
index 0000000000..9b8ee92b04
--- /dev/null
+++ b/cpukit/score/include/rtems/score/context.h
@@ -0,0 +1,133 @@
+/*  context.h
+ *
+ *  This include file contains all information about a context.
+ *
+ *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
+ *  On-Line Applications Research Corporation (OAR).
+ *  All rights assigned to U.S. Government, 1994.
+ *
+ *  This material may be reproduced by or for the U.S. Government pursuant
+ *  to the copyright license under the clause at DFARS 252.227-7013.  This
+ *  notice must appear in all copies of this file and its derivatives.
+ *
+ *  $Id$
+ */
+
+#ifndef __RTEMS_CONTEXT_h
+#define __RTEMS_CONTEXT_h
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rtems/cpu.h>
+
+/*
+ *  The following constant defines the number of bytes required
+ *  to store a full floating point context.
+ */
+
+#define CONTEXT_FP_SIZE CPU_CONTEXT_FP_SIZE
+
+/*
+ *  The following variable is set to TRUE when a reschedule operation
+ *  has determined that the processor should be taken away from the
+ *  currently executing thread and given to the heir thread.
+ */
+
+EXTERN boolean _Context_Switch_necessary;
+
+/*
+ *  _Context_Initialize
+ *
+ *  DESCRIPTION:
+ *
+ *  This routine initializes THE_CONTEXT such that the stack
+ *  pointer, interrupt level, and entry point are correct for the
+ *  thread's initial state.
+ */
+
+#define _Context_Initialize( _the_context, _stack, _size, _isr, _entry ) \
+   _CPU_Context_Initialize( _the_context, _stack, _size, _isr, _entry )
+
+/*
+ *  _Context_Switch
+ *
+ *  DESCRIPTION:
+ *
+ *  This routine saves the current context into the EXECUTING
+ *  context record and restores the context specified by HEIR.
+ */
+
+#define _Context_Switch( _executing, _heir ) \
+   _CPU_Context_switch( _executing, _heir )
+
+/*
+ *  _Context_Restart_self
+ *
+ *  DESCRIPTION:
+ *
+ *  This routine restarts the calling thread by restoring its initial
+ *  stack pointer and returning to the thread's entry point.
+ */
+
+#define _Context_Restart_self( _the_context ) \
+   _CPU_Context_Restart_self( _the_context )
+
+/*
+ *  _Context_Fp_start
+ *
+ *  DESCRIPTION:
+ *
+ *  This function returns the starting address of the floating
+ *  point context save area.  It is assumed that the are reserved
+ *  for the floating point save area is large enough.
+ */
+
+#define _Context_Fp_start( _base, _offset ) \
+   _CPU_Context_Fp_start( (_base), (_offset) )
+
+/*
+ *  _Context_Initialize_fp
+ *
+ *  DESCRIPTION:
+ *
+ *  This routine initializes the floating point context save
+ *  area to contain an initial known state.
+ */
+
+#define _Context_Initialize_fp( _fp_area ) \
+   _CPU_Context_Initialize_fp( _fp_area )
+
+/*
+ *  _Context_Restore_fp
+ *
+ *  DESCRIPTION:
+ *
+ *  This routine restores the floating point context contained
+ *  in the FP_CONTEXT area.  It is assumed that the current
+ *  floating point context has been saved by a previous invocation
+ *  of SAVE_FP.
+ */
+
+#define _Context_Restore_fp( _fp ) \
+   _CPU_Context_restore_fp( _fp )
+
+/*
+ *  _Context_Save_fp
+ *
+ *  DESCRIPTION:
+ *
+ *  This routine saves the current floating point context
+ *  in the FP_CONTEXT area.
+ */
+
+#define _Context_Save_fp( _fp ) \
+   _CPU_Context_save_fp( _fp )
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+/* end of include file */
-- 
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