diff options
Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/external/freertos/portable/ARM/nrf52/port.c')
-rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/external/freertos/portable/ARM/nrf52/port.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/external/freertos/portable/ARM/nrf52/port.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/freertos/portable/ARM/nrf52/port.c new file mode 100644 index 0000000..5a09444 --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/freertos/portable/ARM/nrf52/port.c @@ -0,0 +1,153 @@ +/* + * 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 CM4F 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 ); + +/* + * Exception handlers. + */ +void xPortPendSVHandler( void ); +void vPortSVCHandler( void ); + + +/*-----------------------------------------------------------*/ + +__asm void vPortSVCHandler( void ) +{ + PRESERVE8 + + /* Get the location of the current TCB. */ + ldr r3, =pxCurrentTCB + ldr r1, [r3] + ldr r0, [r1] + /* Pop the core registers. */ + ldmia r0!, {r4-r11, r14} + msr psp, r0 + isb + mov r0, #0 + msr basepri, r0 + bx r14 +} +/*-----------------------------------------------------------*/ + +__asm void vPortStartFirstTask( void ) +{ + PRESERVE8 + EXTERN __Vectors + + /* Use the NVIC offset register to locate the stack. */ + ldr r0, =__Vectors + ldr r0, [r0] + /* Set the msp back to the start of the stack. */ + msr msp, r0 + /* Globally enable interrupts. */ + cpsie i + cpsie f + dsb + isb +#ifdef SOFTDEVICE_PRESENT + /* Block kernel interrupts only (PendSV) before calling SVC */ + mov r0, #(configKERNEL_INTERRUPT_PRIORITY << (8 - configPRIO_BITS)) + msr basepri, r0 +#endif + /* Call SVC to start the first task. */ + svc 0 + + ALIGN +} +/*-----------------------------------------------------------*/ + +__asm void xPortPendSVHandler( void ) +{ + extern uxCriticalNesting; + extern pxCurrentTCB; + extern vTaskSwitchContext; + + PRESERVE8 + + mrs r0, psp + isb + /* Get the location of the current TCB. */ + ldr r3, =pxCurrentTCB + ldr r2, [r3] + + /* Is the task using the FPU context? If so, push high vfp registers. */ + tst r14, #0x10 + it eq + vstmdbeq r0!, {s16-s31} + + /* Save the core registers. */ + stmdb r0!, {r4-r11, r14} + + /* Save the new top of stack into the first member of the TCB. */ + str r0, [r2] + + stmdb sp!, {r3} + mov r0, #(configMAX_SYSCALL_INTERRUPT_PRIORITY << (8 - configPRIO_BITS)) + msr basepri, r0 + dsb + isb + bl vTaskSwitchContext + mov r0, #0 + msr basepri, r0 + ldmia sp!, {r3} + + /* The first item in pxCurrentTCB is the task top of stack. */ + ldr r1, [r3] + ldr r0, [r1] + + /* Pop the core registers. */ + ldmia r0!, {r4-r11, r14} + + /* Is the task using the FPU context? If so, pop the high vfp registers + too. */ + tst r14, #0x10 + it eq + vldmiaeq r0!, {s16-s31} + + msr psp, r0 + isb + + bx r14 + + ALIGN +} +/*-----------------------------------------------------------*/ + |