OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Source/] [portable/] [oWatcom/] [16BitDOS/] [common/] [portasm.h] - Blame information for rev 572

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 572 jeremybenn
/*
2
    FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
3
 
4
    ***************************************************************************
5
    *                                                                         *
6
    * If you are:                                                             *
7
    *                                                                         *
8
    *    + New to FreeRTOS,                                                   *
9
    *    + Wanting to learn FreeRTOS or multitasking in general quickly       *
10
    *    + Looking for basic training,                                        *
11
    *    + Wanting to improve your FreeRTOS skills and productivity           *
12
    *                                                                         *
13
    * then take a look at the FreeRTOS books - available as PDF or paperback  *
14
    *                                                                         *
15
    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *
16
    *                  http://www.FreeRTOS.org/Documentation                  *
17
    *                                                                         *
18
    * A pdf reference manual is also available.  Both are usually delivered   *
19
    * to your inbox within 20 minutes to two hours when purchased between 8am *
20
    * and 8pm GMT (although please allow up to 24 hours in case of            *
21
    * exceptional circumstances).  Thank you for your support!                *
22
    *                                                                         *
23
    ***************************************************************************
24
 
25
    This file is part of the FreeRTOS distribution.
26
 
27
    FreeRTOS is free software; you can redistribute it and/or modify it under
28
    the terms of the GNU General Public License (version 2) as published by the
29
    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
30
    ***NOTE*** The exception to the GPL is included to allow you to distribute
31
    a combined work that includes FreeRTOS without being obliged to provide the
32
    source code for proprietary components outside of the FreeRTOS kernel.
33
    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
34
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
35
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
36
    more details. You should have received a copy of the GNU General Public
37
    License and the FreeRTOS license exception along with FreeRTOS; if not it
38
    can be viewed here: http://www.freertos.org/a00114.html and also obtained
39
    by writing to Richard Barry, contact details for whom are available on the
40
    FreeRTOS WEB site.
41
 
42
    1 tab == 4 spaces!
43
 
44
    http://www.FreeRTOS.org - Documentation, latest information, license and
45
    contact details.
46
 
47
    http://www.SafeRTOS.com - A version that is certified for use in safety
48
    critical systems.
49
 
50
    http://www.OpenRTOS.com - Commercial support, development, porting,
51
    licensing and training services.
52
*/
53
 
54
typedef void tskTCB;
55
extern volatile tskTCB * volatile pxCurrentTCB;
56
extern void vTaskSwitchContext( void );
57
 
58
/*
59
 * Saves the stack pointer for one task into its TCB, calls
60
 * vTaskSwitchContext() to update the TCB being used, then restores the stack
61
 * from the new TCB read to run the task.
62
 */
63
void portSWITCH_CONTEXT( void );
64
 
65
/*
66
 * Load the stack pointer from the TCB of the task which is going to be first
67
 * to execute.  Then force an IRET so the registers and IP are popped off the
68
 * stack.
69
 */
70
void portFIRST_CONTEXT( void );
71
 
72
/* There are slightly different versions depending on whether you are building
73
to include debugger information.  If debugger information is used then there
74
are a couple of extra bytes left of the ISR stack (presumably for use by the
75
debugger).  The true stack pointer is then stored in the bp register.  We add
76
2 to the stack pointer to remove the extra bytes before we restore our context. */
77
 
78
#ifdef DEBUG_BUILD
79
 
80
        #pragma aux portSWITCH_CONTEXT =        "mov    ax, seg pxCurrentTCB"                                                                                                           \
81
                                                                                "mov    ds, ax"                                                                                                                                         \
82
                                                                                "les    bx, pxCurrentTCB"                       /* Save the stack pointer into the TCB. */              \
83
                                                                                "mov    es:0x2[ bx ], ss"                                                                                                                       \
84
                                                                                "mov    es:[ bx ], sp"                                                                                                                          \
85
                                                                                "call   vTaskSwitchContext"                     /* Perform the switch. */                                               \
86
                                                                                "mov    ax, seg pxCurrentTCB"           /* Restore the stack pointer from the TCB. */   \
87
                                                                                "mov    ds, ax"                                                                                                                                         \
88
                                                                                "les    bx, dword ptr pxCurrentTCB"                                                                                                     \
89
                                                                                "mov    ss, es:[ bx + 2 ]"                                                                                                                      \
90
                                                                                "mov    sp, es:[ bx ]"                                                                                                                          \
91
                                                                                "mov    bp, sp"                                         /* Prepair the bp register for the restoration of the SP in the compiler generated portion of the ISR */        \
92
                                                                                "add    bp, 0x0002"
93
 
94
 
95
 
96
        #pragma aux portFIRST_CONTEXT =         "mov    ax, seg pxCurrentTCB"                   \
97
                                                                                "mov    ds, ax"                                                 \
98
                                                                                "les    bx, dword ptr pxCurrentTCB"             \
99
                                                                                "mov    ss, es:[ bx + 2 ]"                              \
100
                                                                                "mov    sp, es:[ bx ]"                                  \
101
                                                                                "add    sp, 0x0002"                                             /* Remove the extra bytes that exist in debug builds before restoring the context. */ \
102
                                                                                "pop    ax"                                                             \
103
                                                                                "pop    ax"                                                             \
104
                                                                                "pop    es"                                                             \
105
                                                                                "pop    ds"                                                             \
106
                                                                                "popa"                                                                  \
107
                                                                                "iret"
108
#else
109
 
110
        #pragma aux portSWITCH_CONTEXT =        "mov    ax, seg pxCurrentTCB"                                                                                                           \
111
                                                                                "mov    ds, ax"                                                                                                                                         \
112
                                                                                "les    bx, pxCurrentTCB"                       /* Save the stack pointer into the TCB. */              \
113
                                                                                "mov    es:0x2[ bx ], ss"                                                                                                                       \
114
                                                                                "mov    es:[ bx ], sp"                                                                                                                          \
115
                                                                                "call   vTaskSwitchContext"                     /* Perform the switch. */                                               \
116
                                                                                "mov    ax, seg pxCurrentTCB"           /* Restore the stack pointer from the TCB. */   \
117
                                                                                "mov    ds, ax"                                                                                                                                         \
118
                                                                                "les    bx, dword ptr pxCurrentTCB"                                                                                                     \
119
                                                                                "mov    ss, es:[ bx + 2 ]"                                                                                                                      \
120
                                                                                "mov    sp, es:[ bx ]"
121
 
122
 
123
        #pragma aux portFIRST_CONTEXT =         "mov    ax, seg pxCurrentTCB"                   \
124
                                                                                "mov    ds, ax"                                                 \
125
                                                                                "les    bx, dword ptr pxCurrentTCB"             \
126
                                                                                "mov    ss, es:[ bx + 2 ]"                              \
127
                                                                                "mov    sp, es:[ bx ]"                                  \
128
                                                                                "pop    ax"                                                             \
129
                                                                                "pop    ax"                                                             \
130
                                                                                "pop    es"                                                             \
131
                                                                                "pop    ds"                                                             \
132
                                                                                "popa"                                                                  \
133
                                                                                "iret"
134
#endif
135
 
136
 

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.