diff options
Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/external/freertos/portable/ARM/nrf51/port.c')
-rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/external/freertos/portable/ARM/nrf51/port.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/external/freertos/portable/ARM/nrf51/port.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/freertos/portable/ARM/nrf51/port.c new file mode 100644 index 0000000..271c269 --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/freertos/portable/ARM/nrf51/port.c @@ -0,0 +1,128 @@ +/* + * 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 ); + +/* + * Exception handlers. + */ +void xPortPendSVHandler( void ); +void vPortSVCHandler( void ); + + +/*-----------------------------------------------------------*/ + +__asm void vPortSVCHandler( void ) +{ + /* This function is no longer used, but retained for backward + compatibility. */ +} +/*-----------------------------------------------------------*/ + +__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 + + ldr r3, =pxCurrentTCB /* Obtain location of pxCurrentTCB. */ + ldr r1, [r3] + ldr r0, [r1] /* The first item in pxCurrentTCB is the task top of stack. */ + adds r0, #32 /* Discard everything up to r0. */ + msr psp, r0 /* This is now the new top of stack to use in the task. */ + movs r0, #2 /* Switch to the psp stack. */ + msr CONTROL, r0 + pop {r0-r5} /* Pop the registers that are saved automatically. */ + mov lr, r5 /* lr is now in r5. */ + cpsie i /* The first task has its context and interrupts can be enabled. */ + pop {pc} /* Finally, pop the PC to jump to the user defined task code. */ + + ALIGN +} +/*-----------------------------------------------------------*/ + +__asm void xPortPendSVHandler( void ) +{ + extern vPortSafeTaskSwitchContext + extern pxCurrentTCB + + PRESERVE8 + + mrs r0, psp + + ldr r3, =pxCurrentTCB /* Get the location of the current TCB. */ + ldr r2, [r3] + + subs r0, #32 /* Make space for the remaining low registers. */ + str r0, [r2] /* Save the new top of stack. */ + stmia r0!, {r4-r7} /* Store the low registers that are not saved automatically. */ + mov r4, r8 /* Store the high registers. */ + mov r5, r9 + mov r6, r10 + mov r7, r11 + stmia r0!, {r4-r7} + + push {r3, r14} + bl vPortSafeTaskSwitchContext + pop {r2, r3} /* lr goes in r3. r2 now holds tcb pointer. */ + + ldr r1, [r2] + ldr r0, [r1] /* The first item in pxCurrentTCB is the task top of stack. */ + adds r0, #16 /* Move to the high registers. */ + ldmia r0!, {r4-r7} /* Pop the high registers. */ + mov r8, r4 + mov r9, r5 + mov r10, r6 + mov r11, r7 + + msr psp, r0 /* Remember the new top of stack for the task. */ + + subs r0, #32 /* Go back for the low registers that are not automatically restored. */ + ldmia r0!, {r4-r7} /* Pop low registers. */ + + bx r3 + ALIGN +} +/*-----------------------------------------------------------*/ + |