diff options
Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/external/freertos/portable/GCC/nrf51/port.c')
| -rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/external/freertos/portable/GCC/nrf51/port.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/external/freertos/portable/GCC/nrf51/port.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/freertos/portable/GCC/nrf51/port.c new file mode 100644 index 0000000..b11642c --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/freertos/portable/GCC/nrf51/port.c @@ -0,0 +1,134 @@ +/* + * FreeRTOS Kernel V10.0.0 + * Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy of + * this software and associated documentation files (the "Software"), to deal in + * the Software without restriction, including without limitation the rights to + * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of + * the Software, and to permit persons to whom the Software is furnished to do so, + * subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all + * copies or substantial portions of the Software. If you wish to use our Amazon + * FreeRTOS name, please do so in a fair use way that does not cause confusion. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS + * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR + * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER + * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + * http://www.FreeRTOS.org + * http://aws.amazon.com/freertos + * + * 1 tab == 4 spaces! + */ + +/*----------------------------------------------------------- + * Implementation of functions defined in portable.h for the ARM CM0 port. + *----------------------------------------------------------*/ + +/* Scheduler includes. */ +#include "FreeRTOS.h" +#include "task.h" + +/* + * Start first task is a separate function so it can be tested in isolation. + */ +void vPortStartFirstTask( void ) __attribute__ (( naked )); + +/* + * Exception handlers. + */ +void vPortSVCHandler( void ); +void xPortPendSVHandler( void ) __attribute__ (( naked )); + + +/*-----------------------------------------------------------*/ + +void vPortStartFirstTask( void ) +{ + __asm volatile( + " .syntax unified \n" + " \n" +#if defined(__SES_ARM) + " ldr r0, =_vectors \n" /* Locate the stack using _vectors table. */ +#else + " ldr r0, =__isr_vector \n" /* Locate the stack using __isr_vector table. */ +#endif + " ldr r0, [r0] \n" + " msr msp, r0 \n" /* Set the msp back to the start of the stack. */ + " \n" + " ldr r3, =pxCurrentTCB \n" /* Obtain location of pxCurrentTCB. */ + " ldr r1, [r3] \n" + " ldr r0, [r1] \n" /* The first item in pxCurrentTCB is the task top of stack. */ + " adds r0, #32 \n" /* Discard everything up to r0 */ + " msr psp, r0 \n" /* This is now the new top of stack to use in the task. */ + " movs r0, #2 \n" /* Switch to the psp stack. */ + " msr CONTROL, r0 \n" + " pop {r0-r5} \n" /* Pop the registers that are saved automatically. */ + " mov lr, r5 \n" /* lr is now in r5. */ + " cpsie i \n" /* The first task has its context and interrupts can be enabled. */ + " pop {pc} \n" /* Finally, pop the PC to jump to the user defined task code. */ + " \n" + " .align 2 \n" + ); +} + +/*-----------------------------------------------------------*/ + +void vPortSVCHandler( void ) +{ + /* This function is no longer used, but retained for backward + compatibility. */ +} + +/*-----------------------------------------------------------*/ + +void xPortPendSVHandler( void ) +{ + /* This is a naked function. */ + + __asm volatile + ( + " .syntax unified \n" + " \n" + " mrs r0, psp \n" + " \n" + " ldr r3, =pxCurrentTCB \n" /* Get the location of the current TCB. */ + " ldr r2, [r3] \n" + " \n" + " subs r0, #32 \n" /* Make space for the remaining low registers. */ + " str r0, [r2] \n" /* Save the new top of stack. */ + " stmia r0!, {r4-r7} \n" /* Store the low registers that are not saved automatically. */ + " mov r4, r8 \n" /* Store the high registers. */ + " mov r5, r9 \n" + " mov r6, r10 \n" + " mov r7, r11 \n" + " stmia r0!, {r4-r7} \n" + " \n" + " push {r3, r14} \n" + " bl vPortSafeTaskSwitchContext \n" + " pop {r2, r3} \n" /* lr goes in r3. r2 now holds tcb pointer. */ + " \n" + " ldr r1, [r2] \n" + " ldr r0, [r1] \n" /* The first item in pxCurrentTCB is the task top of stack. */ + " adds r0, #16 \n" /* Move to the high registers. */ + " ldmia r0!, {r4-r7} \n" /* Pop the high registers. */ + " mov r8, r4 \n" + " mov r9, r5 \n" + " mov r10, r6 \n" + " mov r11, r7 \n" + " \n" + " msr psp, r0 \n" /* Remember the new top of stack for the task. */ + " \n" + " subs r0, #32 \n" /* Go back for the low registers that are not automatically restored. */ + " ldmia r0!, {r4-r7} \n" /* Pop low registers. */ + " \n" + " bx r3 \n" + " \n" + " .align 2 \n" + ); +} |