2 FreeRTOS.org V4.7.2 - Copyright (C) 2003-2008 Richard Barry.
\r
4 This file is part of the FreeRTOS.org distribution.
\r
6 FreeRTOS.org is free software; you can redistribute it and/or modify
\r
7 it under the terms of the GNU General Public License as published by
\r
8 the Free Software Foundation; either version 2 of the License, or
\r
9 (at your option) any later version.
\r
11 FreeRTOS.org is distributed in the hope that it will be useful,
\r
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
\r
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\r
14 GNU General Public License for more details.
\r
16 You should have received a copy of the GNU General Public License
\r
17 along with FreeRTOS.org; if not, write to the Free Software
\r
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
\r
20 A special exception to the GPL can be applied should you wish to distribute
\r
21 a combined work that includes FreeRTOS.org, without being obliged to provide
\r
22 the source code for any proprietary components. See the licensing section
\r
23 of http://www.FreeRTOS.org for full details of how and when the exception
\r
26 ***************************************************************************
\r
28 Please ensure to read the configuration and relevant port sections of the
\r
29 online documentation.
\r
31 +++ http://www.FreeRTOS.org +++
\r
32 Documentation, latest information, license and contact details.
\r
34 +++ http://www.SafeRTOS.com +++
\r
35 A version that is certified for use in safety critical systems.
\r
37 +++ http://www.OpenRTOS.com +++
\r
38 Commercial support, development, porting, licensing and training services.
\r
40 ***************************************************************************
\r
46 + Introduced usage of configKERNEL_INTERRUPT_PRIORITY macro to set the
\r
47 interrupt priority used by the kernel.
\r
50 #include <FreeRTOSConfig.h>
\r
52 /* For backward compatibility, ensure configKERNEL_INTERRUPT_PRIORITY is
\r
53 defined. The value zero should also ensure backward compatibility.
\r
54 FreeRTOS.org versions prior to V4.3.0 did not include this definition. */
\r
55 #ifndef configKERNEL_INTERRUPT_PRIORITY
\r
56 #define configKERNEL_INTERRUPT_PRIORITY 0
\r
63 EXTERN vPortYieldFromISR
\r
64 EXTERN uxCriticalNesting
\r
66 EXTERN vTaskSwitchContext
\r
69 PUBLIC xPortPendSVHandler
\r
70 PUBLIC vPortSetInterruptMask
\r
71 PUBLIC vPortClearInterruptMask
\r
72 PUBLIC vPortSVCHandler
\r
73 PUBLIC vPortStartFirstTask
\r
76 /*-----------------------------------------------------------*/
\r
82 /*-----------------------------------------------------------*/
\r
86 ldr r3, =pxCurrentTCB /* Get the location of the current TCB. */
\r
89 ldr r1, =uxCriticalNesting /* Save the remaining registers and the critical nesting count onto the task stack. */
\r
91 stmdb r0!, {r1,r4-r11}
\r
92 str r0, [r2] /* Save the new top of stack into the first member of the TCB. */
\r
94 stmdb sp!, {r3, r14}
\r
95 bl vTaskSwitchContext
\r
96 ldmia sp!, {r3, r14}
\r
99 ldr r2, =uxCriticalNesting
\r
100 ldr r0, [r1] /* The first item in pxCurrentTCB is the task top of stack. */
\r
101 ldmia r0!, {r1, r4-r11} /* Pop the registers and the critical nesting count. */
\r
102 str r1, [r2] /* Save the new critical nesting value into ulCriticalNesting. */
\r
106 cbnz r1, sv_disable_interrupts /* If the nesting count is greater than 0 we need to exit with interrupts masked. */
\r
109 sv_disable_interrupts:
\r
110 mov r1, #configKERNEL_INTERRUPT_PRIORITY
\r
114 /*-----------------------------------------------------------*/
\r
116 vPortSetInterruptMask:
\r
118 mov R0, #configKERNEL_INTERRUPT_PRIORITY
\r
124 /*-----------------------------------------------------------*/
\r
126 vPortClearInterruptMask:
\r
134 /*-----------------------------------------------------------*/
\r
137 ldr r3, =pxCurrentTCB
\r
140 ldmia r0!, {r1, r4-r11}
\r
141 ldr r2, =uxCriticalNesting
\r
147 /*-----------------------------------------------------------*/
\r
149 vPortStartFirstTask
\r