/*\r
- FreeRTOS V7.2.0 - Copyright (C) 2012 Real Time Engineers Ltd.\r
- \r
-\r
- ***************************************************************************\r
- * *\r
- * FreeRTOS tutorial books are available in pdf and paperback. *\r
- * Complete, revised, and edited pdf reference manuals are also *\r
- * available. *\r
- * *\r
- * Purchasing FreeRTOS documentation will not only help you, by *\r
- * ensuring you get running as quickly as possible and with an *\r
- * in-depth knowledge of how to use FreeRTOS, it will also help *\r
- * the FreeRTOS project to continue with its mission of providing *\r
- * professional grade, cross platform, de facto standard solutions *\r
- * for microcontrollers - completely free of charge! *\r
- * *\r
- * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *\r
- * *\r
- * Thank you for using FreeRTOS, and thank you for your support! *\r
- * *\r
- ***************************************************************************\r
-\r
-\r
- This file is part of the FreeRTOS distribution.\r
-\r
- FreeRTOS is free software; you can redistribute it and/or modify it under\r
- the terms of the GNU General Public License (version 2) as published by the\r
- Free Software Foundation AND MODIFIED BY the FreeRTOS exception.\r
- >>>NOTE<<< The modification to the GPL is included to allow you to\r
- distribute a combined work that includes FreeRTOS without being obliged to\r
- provide the source code for proprietary components outside of the FreeRTOS\r
- kernel. FreeRTOS is distributed in the hope that it will be useful, but\r
- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY\r
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for\r
- more details. You should have received a copy of the GNU General Public\r
- License and the FreeRTOS license exception along with FreeRTOS; if not it\r
- can be viewed here: http://www.freertos.org/a00114.html and also obtained\r
- by writing to Richard Barry, contact details for whom are available on the\r
- FreeRTOS WEB site.\r
-\r
- 1 tab == 4 spaces!\r
- \r
- ***************************************************************************\r
- * *\r
- * Having a problem? Start by reading the FAQ "My application does *\r
- * not run, what could be wrong? *\r
- * *\r
- * http://www.FreeRTOS.org/FAQHelp.html *\r
- * *\r
- ***************************************************************************\r
-\r
- \r
- http://www.FreeRTOS.org - Documentation, training, latest information, \r
- license and contact details.\r
- \r
- http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
- including FreeRTOS+Trace - an indispensable productivity tool.\r
-\r
- Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell \r
- the code with commercial support, indemnification, and middleware, under \r
- the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also\r
- provide a safety engineered and independently SIL3 certified version under \r
- the SafeRTOS brand: http://www.SafeRTOS.com.\r
-*/\r
+ * FreeRTOS Kernel V10.3.0\r
+ * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.\r
+ *\r
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of\r
+ * this software and associated documentation files (the "Software"), to deal in\r
+ * the Software without restriction, including without limitation the rights to\r
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of\r
+ * the Software, and to permit persons to whom the Software is furnished to do so,\r
+ * subject to the following conditions:\r
+ *\r
+ * The above copyright notice and this permission notice shall be included in all\r
+ * copies or substantial portions of the Software.\r
+ *\r
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS\r
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR\r
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER\r
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN\r
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\r
+ *\r
+ * http://www.FreeRTOS.org\r
+ * http://aws.amazon.com/freertos\r
+ *\r
+ * 1 tab == 4 spaces!\r
+ */\r
\r
#include <FreeRTOSConfig.h>\r
\r
-/* For backward compatibility, ensure configKERNEL_INTERRUPT_PRIORITY is\r
-defined. The value zero should also ensure backward compatibility.\r
-FreeRTOS.org versions prior to V4.3.0 did not include this definition. */\r
-#ifndef configKERNEL_INTERRUPT_PRIORITY\r
- #define configKERNEL_INTERRUPT_PRIORITY 0\r
-#endif\r
-\r
- \r
RSEG CODE:CODE(2)\r
thumb\r
\r
PUBLIC xPortPendSVHandler\r
PUBLIC vPortSVCHandler\r
PUBLIC vPortStartFirstTask\r
-\r
+ PUBLIC ulSetInterruptMaskFromISR\r
+ PUBLIC vClearInterruptMaskFromISR\r
\r
/*-----------------------------------------------------------*/\r
\r
vSetMSP\r
msr msp, r0\r
bx lr\r
- \r
+\r
/*-----------------------------------------------------------*/\r
\r
xPortPendSVHandler:\r
- mrs r0, psp \r
- \r
+ mrs r0, psp\r
+\r
ldr r3, =pxCurrentTCB /* Get the location of the current TCB. */\r
- ldr r2, [r3] \r
- \r
+ ldr r2, [r3]\r
+\r
subs r0, r0, #32 /* Make space for the remaining low registers. */\r
str r0, [r2] /* Save the new top of stack. */\r
stmia r0!, {r4-r7} /* Store the low registers that are not saved automatically. */\r
mov r4, r8 /* Store the high registers. */\r
- mov r5, r9 \r
- mov r6, r10 \r
- mov r7, r11 \r
- stmia r0!, {r4-r7} \r
- \r
- push {r3, r14} \r
- cpsid i \r
- bl vTaskSwitchContext \r
- cpsie i \r
+ mov r5, r9\r
+ mov r6, r10\r
+ mov r7, r11\r
+ stmia r0!, {r4-r7}\r
+\r
+ push {r3, r14}\r
+ cpsid i\r
+ bl vTaskSwitchContext\r
+ cpsie i\r
pop {r2, r3} /* lr goes in r3. r2 now holds tcb pointer. */\r
- \r
- ldr r1, [r2] \r
+\r
+ ldr r1, [r2]\r
ldr r0, [r1] /* The first item in pxCurrentTCB is the task top of stack. */\r
adds r0, r0, #16 /* Move to the high registers. */\r
ldmia r0!, {r4-r7} /* Pop the high registers. */\r
- mov r8, r4 \r
- mov r9, r5 \r
- mov r10, r6 \r
- mov r11, r7 \r
- \r
+ mov r8, r4\r
+ mov r9, r5\r
+ mov r10, r6\r
+ mov r11, r7\r
+\r
msr psp, r0 /* Remember the new top of stack for the task. */\r
- \r
+\r
subs r0, r0, #32 /* Go back for the low registers that are not automatically restored. */\r
ldmia r0!, {r4-r7} /* Pop low registers. */\r
- \r
- bx r3 \r
+\r
+ bx r3\r
\r
/*-----------------------------------------------------------*/\r
\r
vPortSVCHandler;\r
- ldr r3, =pxCurrentTCB /* Restore the context. */\r
- ldr r1, [r3] /* Get the pxCurrentTCB address. */\r
- ldr r0, [r1] /* The first item in pxCurrentTCB is the task top of stack. */\r
- adds r0, r0, #16 /* Move to the high registers. */\r
- ldmia r0!, {r4-r7} /* Pop the high registers. */\r
- mov r8, r4 \r
- mov r9, r5 \r
- mov r10, r6 \r
- mov r11, r7 \r
- \r
- msr psp, r0 /* Remember the new top of stack for the task. */\r
- \r
- subs r0, r0, #32 /* Go back for the low registers that are not automatically restored. */\r
- ldmia r0!, {r4-r7} /* Pop low registers. */\r
- mov r1, r14 /* OR R14 with 0x0d. */\r
- movs r0, #0x0d \r
- orrs r1, r0 \r
- bx r1 \r
+ /* This function is no longer used, but retained for backward\r
+ compatibility. */\r
+ bx lr\r
\r
/*-----------------------------------------------------------*/\r
\r
vPortStartFirstTask\r
- movs r0, #0x00 /* Locate the top of stack. */\r
- ldr r0, [r0] \r
- msr msp, r0 /* Set the msp back to the start of the stack. */\r
- cpsie i /* Globally enable interrupts. */\r
- svc 0 /* System call to start first task. */\r
- nop \r
- \r
+ /* The MSP stack is not reset as, unlike on M3/4 parts, there is no vector\r
+ table offset register that can be used to locate the initial stack value.\r
+ Not all M0 parts have the application vector table at address 0. */\r
+\r
+ ldr r3, =pxCurrentTCB /* Obtain location of pxCurrentTCB. */\r
+ ldr r1, [r3]\r
+ ldr r0, [r1] /* The first item in pxCurrentTCB is the task top of stack. */\r
+ adds r0, #32 /* Discard everything up to r0. */\r
+ msr psp, r0 /* This is now the new top of stack to use in the task. */\r
+ movs r0, #2 /* Switch to the psp stack. */\r
+ msr CONTROL, r0\r
+ isb\r
+ pop {r0-r5} /* Pop the registers that are saved automatically. */\r
+ mov lr, r5 /* lr is now in r5. */\r
+ pop {r3} /* The return address is now in r3. */\r
+ pop {r2} /* Pop and discard the XPSR. */\r
+ cpsie i /* The first task has its context and interrupts can be enabled. */\r
+ bx r3 /* Jump to the user defined task code. */\r
+\r
+/*-----------------------------------------------------------*/\r
+\r
+ulSetInterruptMaskFromISR\r
+ mrs r0, PRIMASK\r
+ cpsid i\r
+ bx lr\r
+\r
+/*-----------------------------------------------------------*/\r
+\r
+vClearInterruptMaskFromISR\r
+ msr PRIMASK, r0\r
+ bx lr\r
+\r
END\r
-
\ No newline at end of file
projects / freertos / blobdiff