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Diffstat (limited to 'contrib/FreeRTOS_Library/portable/port.c')
| -rw-r--r-- | contrib/FreeRTOS_Library/portable/port.c | 281 |
1 files changed, 0 insertions, 281 deletions
diff --git a/contrib/FreeRTOS_Library/portable/port.c b/contrib/FreeRTOS_Library/portable/port.c deleted file mode 100644 index 6f35e6d..0000000 --- a/contrib/FreeRTOS_Library/portable/port.c +++ /dev/null @@ -1,281 +0,0 @@ -/*
- FreeRTOS V6.1.0 - Copyright (C) 2010 Real Time Engineers Ltd.
-
- ***************************************************************************
- * *
- * If you are: *
- * *
- * + New to FreeRTOS, *
- * + Wanting to learn FreeRTOS or multitasking in general quickly *
- * + Looking for basic training, *
- * + Wanting to improve your FreeRTOS skills and productivity *
- * *
- * then take a look at the FreeRTOS books - available as PDF or paperback *
- * *
- * "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
- * http://www.FreeRTOS.org/Documentation *
- * *
- * A pdf reference manual is also available. Both are usually delivered *
- * to your inbox within 20 minutes to two hours when purchased between 8am *
- * and 8pm GMT (although please allow up to 24 hours in case of *
- * exceptional circumstances). Thank you for your support! *
- * *
- ***************************************************************************
-
- This file is part of the FreeRTOS distribution.
-
- FreeRTOS is free software; you can redistribute it and/or modify it under
- the terms of the GNU General Public License (version 2) as published by the
- Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
- ***NOTE*** The exception to the GPL is included to allow you to distribute
- a combined work that includes FreeRTOS without being obliged to provide the
- source code for proprietary components outside of the FreeRTOS kernel.
- FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- more details. You should have received a copy of the GNU General Public
- License and the FreeRTOS license exception along with FreeRTOS; if not it
- can be viewed here: http://www.freertos.org/a00114.html and also obtained
- by writing to Richard Barry, contact details for whom are available on the
- FreeRTOS WEB site.
-
- 1 tab == 4 spaces!
-
- http://www.FreeRTOS.org - Documentation, latest information, license and
- contact details.
-
- http://www.SafeRTOS.com - A version that is certified for use in safety
- critical systems.
-
- http://www.OpenRTOS.com - Commercial support, development, porting,
- licensing and training services.
-*/
-
-/*-----------------------------------------------------------
- * Implementation of functions defined in portable.h for the ARM CM3 port.
- *----------------------------------------------------------*/
-
-/* Scheduler includes. */
-#include "FreeRTOS.h"
-#include "task.h"
-
-/* For backward compatibility, ensure configKERNEL_INTERRUPT_PRIORITY is
-defined. The value should also ensure backward compatibility.
-FreeRTOS.org versions prior to V4.4.0 did not include this definition. */
-#ifndef configKERNEL_INTERRUPT_PRIORITY
- #define configKERNEL_INTERRUPT_PRIORITY 255
-#endif
-
-/* Constants required to manipulate the NVIC. */
-#define portNVIC_SYSTICK_CTRL ( ( volatile unsigned long *) 0xe000e010 )
-#define portNVIC_SYSTICK_LOAD ( ( volatile unsigned long *) 0xe000e014 )
-#define portNVIC_INT_CTRL ( ( volatile unsigned long *) 0xe000ed04 )
-#define portNVIC_SYSPRI2 ( ( volatile unsigned long *) 0xe000ed20 )
-#define portNVIC_SYSTICK_CLK 0x00000004
-#define portNVIC_SYSTICK_INT 0x00000002
-#define portNVIC_SYSTICK_ENABLE 0x00000001
-#define portNVIC_PENDSVSET 0x10000000
-#define portNVIC_PENDSV_PRI ( ( ( unsigned long ) configKERNEL_INTERRUPT_PRIORITY ) << 16 )
-#define portNVIC_SYSTICK_PRI ( ( ( unsigned long ) configKERNEL_INTERRUPT_PRIORITY ) << 24 )
-
-/* Constants required to set up the initial stack. */
-#define portINITIAL_XPSR ( 0x01000000 )
-
-/* The priority used by the kernel is assigned to a variable to make access
-from inline assembler easier. */
-const unsigned long ulKernelPriority = configKERNEL_INTERRUPT_PRIORITY;
-
-/* Each task maintains its own interrupt status in the critical nesting
-variable. */
-static unsigned portBASE_TYPE uxCriticalNesting = 0xaaaaaaaa;
-
-/*
- * Setup the timer to generate the tick interrupts.
- */
-static void prvSetupTimerInterrupt( void );
-
-/*
- * Exception handlers.
- */
-void xPortPendSVHandler( void ) __attribute__ (( naked ));
-void xPortSysTickHandler( void );
-void vPortSVCHandler( void ) __attribute__ (( naked ));
-
-/*
- * Start first task is a separate function so it can be tested in isolation.
- */
-void vPortStartFirstTask( void ) __attribute__ (( naked ));
-
-/*-----------------------------------------------------------*/
-
-/*
- * See header file for description.
- */
-portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
-{
- /* Simulate the stack frame as it would be created by a context switch
- interrupt. */
- pxTopOfStack--; /* Offset added to account for the way the MCU uses the stack on entry/exit of interrupts. */
- *pxTopOfStack = portINITIAL_XPSR; /* xPSR */
- pxTopOfStack--;
- *pxTopOfStack = ( portSTACK_TYPE ) pxCode; /* PC */
- pxTopOfStack--;
- *pxTopOfStack = 0; /* LR */
- pxTopOfStack -= 5; /* R12, R3, R2 and R1. */
- *pxTopOfStack = ( portSTACK_TYPE ) pvParameters; /* R0 */
- pxTopOfStack -= 8; /* R11, R10, R9, R8, R7, R6, R5 and R4. */
-
- return pxTopOfStack;
-}
-/*-----------------------------------------------------------*/
-
-void vPortSVCHandler( void )
-{
- __asm volatile (
- " ldr r3, pxCurrentTCBConst2 \n" /* Restore the context. */
- " ldr r1, [r3] \n" /* Use pxCurrentTCBConst to get the pxCurrentTCB address. */
- " ldr r0, [r1] \n" /* The first item in pxCurrentTCB is the task top of stack. */
- " ldmia r0!, {r4-r11} \n" /* Pop the registers that are not automatically saved on exception entry and the critical nesting count. */
- " msr psp, r0 \n" /* Restore the task stack pointer. */
- " mov r0, #0 \n"
- " msr basepri, r0 \n"
- " orr r14, #0xd \n"
- " bx r14 \n"
- " \n"
- " .align 2 \n"
- "pxCurrentTCBConst2: .word pxCurrentTCB \n"
- );
-}
-/*-----------------------------------------------------------*/
-
-void vPortStartFirstTask( void )
-{
- __asm volatile(
- " ldr r0, =0xE000ED08 \n" /* Use the NVIC offset register to locate the stack. */
- " ldr r0, [r0] \n"
- " ldr r0, [r0] \n"
- " msr msp, r0 \n" /* Set the msp back to the start of the stack. */
- " svc 0 \n" /* System call to start first task. */
- );
-}
-/*-----------------------------------------------------------*/
-
-/*
- * See header file for description.
- */
-portBASE_TYPE xPortStartScheduler( void )
-{
- /* Make PendSV, CallSV and SysTick the same priroity as the kernel. */
- *(portNVIC_SYSPRI2) |= portNVIC_PENDSV_PRI;
- *(portNVIC_SYSPRI2) |= portNVIC_SYSTICK_PRI;
-
- /* Start the timer that generates the tick ISR. Interrupts are disabled
- here already. */
- prvSetupTimerInterrupt();
-
- /* Initialise the critical nesting count ready for the first task. */
- uxCriticalNesting = 0;
-
- /* Start the first task. */
- vPortStartFirstTask();
-
- /* Should not get here! */
- return 0;
-}
-/*-----------------------------------------------------------*/
-
-void vPortEndScheduler( void )
-{
- /* It is unlikely that the CM3 port will require this function as there
- is nothing to return to. */
-}
-/*-----------------------------------------------------------*/
-
-void vPortYieldFromISR( void )
-{
- /* Set a PendSV to request a context switch. */
- *(portNVIC_INT_CTRL) = portNVIC_PENDSVSET;
-}
-/*-----------------------------------------------------------*/
-
-void vPortEnterCritical( void )
-{
- portDISABLE_INTERRUPTS();
- uxCriticalNesting++;
-}
-/*-----------------------------------------------------------*/
-
-void vPortExitCritical( void )
-{
- uxCriticalNesting--;
- if( uxCriticalNesting == 0 )
- {
- portENABLE_INTERRUPTS();
- }
-}
-/*-----------------------------------------------------------*/
-
-void xPortPendSVHandler( void )
-{
- /* This is a naked function. */
-
- __asm volatile
- (
- " mrs r0, psp \n"
- " \n"
- " ldr r3, pxCurrentTCBConst \n" /* Get the location of the current TCB. */
- " ldr r2, [r3] \n"
- " \n"
- " stmdb r0!, {r4-r11} \n" /* Save the remaining registers. */
- " str r0, [r2] \n" /* Save the new top of stack into the first member of the TCB. */
- " \n"
- " stmdb sp!, {r3, r14} \n"
- " mov r0, %0 \n"
- " msr basepri, r0 \n"
- " bl vTaskSwitchContext \n"
- " mov r0, #0 \n"
- " msr basepri, r0 \n"
- " ldmia sp!, {r3, r14} \n"
- " \n" /* Restore the context, including the critical nesting count. */
- " ldr r1, [r3] \n"
- " ldr r0, [r1] \n" /* The first item in pxCurrentTCB is the task top of stack. */
- " ldmia r0!, {r4-r11} \n" /* Pop the registers. */
- " msr psp, r0 \n"
- " bx r14 \n"
- " \n"
- " .align 2 \n"
- "pxCurrentTCBConst: .word pxCurrentTCB \n"
- ::"i"(configMAX_SYSCALL_INTERRUPT_PRIORITY)
- );
-}
-/*-----------------------------------------------------------*/
-
-void xPortSysTickHandler( void )
-{
-unsigned long ulDummy;
-
- /* If using preemption, also force a context switch. */
- #if configUSE_PREEMPTION == 1
- *(portNVIC_INT_CTRL) = portNVIC_PENDSVSET;
- #endif
-
- ulDummy = portSET_INTERRUPT_MASK_FROM_ISR();
- {
- vTaskIncrementTick();
- }
- portCLEAR_INTERRUPT_MASK_FROM_ISR( ulDummy );
-}
-/*-----------------------------------------------------------*/
-
-/*
- * Setup the systick timer to generate the tick interrupts at the required
- * frequency.
- */
-void prvSetupTimerInterrupt( void )
-{
- /* Configure SysTick to interrupt at the requested rate. */
- *(portNVIC_SYSTICK_LOAD) = ( configCPU_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL;
- *(portNVIC_SYSTICK_CTRL) = portNVIC_SYSTICK_CLK | portNVIC_SYSTICK_INT | portNVIC_SYSTICK_ENABLE;
-}
-/*-----------------------------------------------------------*/
-
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