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/*  context.h
 *
 *  This include file contains all information about a context.
 *
 *  COPYRIGHT (c) 1989-1999.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.OARcorp.com/rtems/license.html.
 *
 *  $Id: context.h,v 1.2 2001-09-27 11:59:32 chris Exp $
 */
 
#ifndef __RTEMS_CONTEXT_h
#define __RTEMS_CONTEXT_h
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <rtems/score/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.
 */
 
SCORE_EXTERN volatile 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, _is_fp ) \
   _CPU_Context_Initialize( _the_context, _stack, _size, _isr, _entry, _is_fp )
 
/*
 *  _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 */

Line No.	Rev	Author	Line
1	30	unneback	`/* context.h`
2			`*`
3			`* This include file contains all information about a context.`
4			`*`
5			`* COPYRIGHT (c) 1989-1999.`
6			`* On-Line Applications Research Corporation (OAR).`
7			`*`
8			`* The license and distribution terms for this file may be`
9			`* found in the file LICENSE in this distribution or at`
10			`* http://www.OARcorp.com/rtems/license.html.`
11			`*`
12			`* $Id: context.h,v 1.2 2001-09-27 11:59:32 chris Exp $`
13			`*/`
14
15			`#ifndef __RTEMS_CONTEXT_h`
16			`#define __RTEMS_CONTEXT_h`
17
18			`#ifdef __cplusplus`
19			`extern "C" {`
20			`#endif`
21
22			`#include <rtems/score/cpu.h>`
23
24			`/*`
25			`* The following constant defines the number of bytes required`
26			`* to store a full floating point context.`
27			`*/`
28
29			`#define CONTEXT_FP_SIZE CPU_CONTEXT_FP_SIZE`
30
31			`/*`
32			`* The following variable is set to TRUE when a reschedule operation`
33			`* has determined that the processor should be taken away from the`
34			`* currently executing thread and given to the heir thread.`
35			`*/`
36
37			`SCORE_EXTERN volatile boolean _Context_Switch_necessary;`
38
39			`/*`
40			`* _Context_Initialize`
41			`*`
42			`* DESCRIPTION:`
43			`*`
44			`* This routine initializes THE_CONTEXT such that the stack`
45			`* pointer, interrupt level, and entry point are correct for the`
46			`* thread's initial state.`
47			`*/`
48
49			`#define \`
50			`_Context_Initialize( _the_context, _stack, _size, _isr, _entry, _is_fp ) \`
51			`_CPU_Context_Initialize( _the_context, _stack, _size, _isr, _entry, _is_fp )`
52
53			`/*`
54			`* _Context_Switch`
55			`*`
56			`* DESCRIPTION:`
57			`*`
58			`* This routine saves the current context into the EXECUTING`
59			`* context record and restores the context specified by HEIR.`
60			`*/`
61
62			`#define _Context_Switch( _executing, _heir ) \`
63			`_CPU_Context_switch( _executing, _heir )`
64
65			`/*`
66			`* _Context_Restart_self`
67			`*`
68			`* DESCRIPTION:`
69			`*`
70			`* This routine restarts the calling thread by restoring its initial`
71			`* stack pointer and returning to the thread's entry point.`
72			`*/`
73
74			`#define _Context_Restart_self( _the_context ) \`
75			`_CPU_Context_Restart_self( _the_context )`
76
77			`/*`
78			`* _Context_Fp_start`
79			`*`
80			`* DESCRIPTION:`
81			`*`
82			`* This function returns the starting address of the floating`
83			`* point context save area. It is assumed that the are reserved`
84			`* for the floating point save area is large enough.`
85			`*/`
86
87			`#define _Context_Fp_start( _base, _offset ) \`
88			`_CPU_Context_Fp_start( (_base), (_offset) )`
89
90			`/*`
91			`* _Context_Initialize_fp`
92			`*`
93			`* DESCRIPTION:`
94			`*`
95			`* This routine initializes the floating point context save`
96			`* area to contain an initial known state.`
97			`*/`
98
99			`#define _Context_Initialize_fp( _fp_area ) \`
100			`_CPU_Context_Initialize_fp( _fp_area )`
101
102			`/*`
103			`* _Context_Restore_fp`
104			`*`
105			`* DESCRIPTION:`
106			`*`
107			`* This routine restores the floating point context contained`
108			`* in the FP_CONTEXT area. It is assumed that the current`
109			`* floating point context has been saved by a previous invocation`
110			`* of SAVE_FP.`
111			`*/`
112
113			`#define _Context_Restore_fp( _fp ) \`
114			`_CPU_Context_restore_fp( _fp )`
115
116			`/*`
117			`* _Context_Save_fp`
118			`*`
119			`* DESCRIPTION:`
120			`*`
121			`* This routine saves the current floating point context`
122			`* in the FP_CONTEXT area.`
123			`*/`
124
125			`#define _Context_Save_fp( _fp ) \`
126			`_CPU_Context_save_fp( _fp )`
127
128			`#ifdef __cplusplus`
129			`}`
130			`#endif`
131
132			`#endif`
133			`/* end of include file */`

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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [score/] [include/] [rtems/] [score/] [context.h] - Blame information for rev 587