diff options
Diffstat (limited to 'FreeRTOS/Source/portable/ThirdParty/GCC/RISC-V/port.c')
| -rw-r--r-- | FreeRTOS/Source/portable/ThirdParty/GCC/RISC-V/port.c | 385 |
1 files changed, 0 insertions, 385 deletions
diff --git a/FreeRTOS/Source/portable/ThirdParty/GCC/RISC-V/port.c b/FreeRTOS/Source/portable/ThirdParty/GCC/RISC-V/port.c deleted file mode 100644 index 3d96ce8aa..000000000 --- a/FreeRTOS/Source/portable/ThirdParty/GCC/RISC-V/port.c +++ /dev/null @@ -1,385 +0,0 @@ -/*
- FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd.
- All rights reserved
-
- VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
-
- This file is part of the FreeRTOS distribution and was contributed
- to the project by Technolution B.V. (www.technolution.nl,
- freertos-riscv@technolution.eu) under the terms of the FreeRTOS
- contributors license.
-
- 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 modification 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. Full license text is available on the following
- link: http://www.freertos.org/a00114.html
-
- ***************************************************************************
- * *
- * FreeRTOS provides completely free yet professionally developed, *
- * robust, strictly quality controlled, supported, and cross *
- * platform software that is more than just the market leader, it *
- * is the industry's de facto standard. *
- * *
- * Help yourself get started quickly while simultaneously helping *
- * to support the FreeRTOS project by purchasing a FreeRTOS *
- * tutorial book, reference manual, or both: *
- * http://www.FreeRTOS.org/Documentation *
- * *
- ***************************************************************************
-
- http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
- the FAQ page "My application does not run, what could be wrong?". Have you
- defined configASSERT()?
-
- http://www.FreeRTOS.org/support - In return for receiving this top quality
- embedded software for free we request you assist our global community by
- participating in the support forum.
-
- http://www.FreeRTOS.org/training - Investing in training allows your team to
- be as productive as possible as early as possible. Now you can receive
- FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
- Ltd, and the world's leading authority on the world's leading RTOS.
-
- http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
- including FreeRTOS+Trace - an indispensable productivity tool, a DOS
- compatible FAT file system, and our tiny thread aware UDP/IP stack.
-
- http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
- Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
-
- http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
- Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
- licenses offer ticketed support, indemnification and commercial middleware.
-
- http://www.SafeRTOS.com - High Integrity Systems also provide a safety
- engineered and independently SIL3 certified version for use in safety and
- mission critical applications that require provable dependability.
-
- 1 tab == 4 spaces!
-*/
-
-/*-----------------------------------------------------------
- * Implementation of functions defined in portable.h for the RISC-V port.
- *----------------------------------------------------------*/
-
-/* Scheduler includes. */
-#include "FreeRTOS.h"
-#include "task.h"
-#include "portmacro.h"
-
-#include "riscv_hal.h"
-
-#ifdef __riscv64
-# define STORE sd
-# define LOAD ld
-# define REGBYTES 8
-#else
-# define STORE sw
-# define LOAD lw
-# define REGBYTES 4
-#endif
-/* A variable is used to keep track of the critical section nesting. This
-variable has to be stored as part of the task context and must be initialized to
-a non zero value to ensure interrupts don't inadvertently become unmasked before
-the scheduler starts. As it is stored as part of the task context it will
-automatically be set to 0 when the first task is started. */
-static UBaseType_t uxCriticalNesting = 0xaaaaaaaa;
-
-/* Contains context when starting scheduler, save all 31 registers */
-#ifdef __gracefulExit
-BaseType_t xStartContext[31] = {0};
-#endif
-
-
-typedef struct
-{
- uint32_t val_low;
- uint32_t val_high;
-}riscv_machine_timer_t;
-
-static volatile riscv_machine_timer_t *mtime = (riscv_machine_timer_t *)0x4400BFF8;
-
-static volatile riscv_machine_timer_t *mtimecmp = (riscv_machine_timer_t *)0x44004000;
-
-/*
- * Setup the timer to generate the tick interrupts.
- */
-void vPortSetupTimer( void );
-
-/*
- * Set the next interval for the timer
- */
-static void prvSetNextTimerInterrupt( void );
-
-/*
- * Used to catch tasks that attempt to return from their implementing function.
- */
-static void prvTaskExitError( void );
-
-void vPortEnterCritical( void )
-{
- portDISABLE_INTERRUPTS();
- uxCriticalNesting++;
-}
-/*-----------------------------------------------------------*/
-
-void vPortExitCritical( void )
-{
- uxCriticalNesting--;
- if( uxCriticalNesting == 0 )
- {
- portENABLE_INTERRUPTS();
- }
-}
-/*-----------------------------------------------------------*/
-
-/* Sets the next timer interrupt
- * Reads previous timer compare register, and adds tickrate */
-static void prvSetNextTimerInterrupt(void)
-{
- uint64_t time;
-
- time = mtime->val_low;
- time |= ((uint64_t)mtime->val_high << 32);
-
- time += (configCPU_CLOCK_HZ / configTICK_RATE_HZ);
-
- mtimecmp->val_low = (uint32_t)(time & 0xFFFFFFFF);
- mtimecmp->val_high = (uint32_t)((time >> 32) & 0xFFFFFFFF);
-
- /* Enable timer interrupt */
- __asm volatile("csrs mie,%0"::"r"(0x80));
-}
-/*-----------------------------------------------------------*/
-
-/* Sets and enable the timer interrupt */
-void vPortSetupTimer(void)
-{
- uint64_t time;
-
- time = mtime->val_low;
- time |= ((uint64_t)mtime->val_high << 32);
-
- time += (configCPU_CLOCK_HZ / configTICK_RATE_HZ);
-
- mtimecmp->val_low = (uint32_t)(time & 0xFFFFFFFF);
- mtimecmp->val_high = (uint32_t)((time >> 32) & 0xFFFFFFFF);
-
-
- /* Enable timer interrupt */
- __asm volatile("csrs mie,%0"::"r"(0x80));
-}
-/*-----------------------------------------------------------*/
-
-void prvTaskExitError( void )
-{
- /* A function that implements a task must not exit or attempt to return to
- its caller as there is nothing to return to. If a task wants to exit it
- should instead call vTaskDelete( NULL ).
-
- Artificially force an assert() to be triggered if configASSERT() is
- defined, then stop here so application writers can catch the error. */
- configASSERT( uxCriticalNesting == ~0UL );
- portDISABLE_INTERRUPTS();
- for( ;; );
-}
-/*-----------------------------------------------------------*/
-
-/* Clear current interrupt mask and set given mask */
-void vPortClearInterruptMask(int mask)
-{
- __asm volatile("csrw mie, %0"::"r"(mask));
-}
-/*-----------------------------------------------------------*/
-
-/* Set interrupt mask and return current interrupt enable register */
-int vPortSetInterruptMask(void)
-{
- int ret;
- __asm volatile("csrr %0,mie":"=r"(ret));
- __asm volatile("csrc mie,%0"::"i"(7));
- return ret;
-}
-
-/*
- * See header file for description.
- */
-StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters )
-{
- /* Simulate the stack frame as it would be created by a context switch
- interrupt. */
- register int *tp asm("x3");
- pxTopOfStack--;
- *pxTopOfStack = (portSTACK_TYPE)pxCode; /* Start address */
- pxTopOfStack -= 22;
- *pxTopOfStack = (portSTACK_TYPE)pvParameters; /* Register a0 */
- pxTopOfStack -= 6;
- *pxTopOfStack = (portSTACK_TYPE)tp; /* Register thread pointer */
- pxTopOfStack -= 3;
- *pxTopOfStack = (portSTACK_TYPE)prvTaskExitError; /* Register ra */
-
- return pxTopOfStack;
-}
-/*-----------------------------------------------------------*/
-
-void vPortSysTickHandler( void )
-{
- /*Save Context*/
- {
- __asm volatile("lw t0, pxCurrentTCB");
- __asm volatile("sw a2, 0x0(t0)");
- }
-
- /* Increment the RTOS tick. */
- prvSetNextTimerInterrupt();
-
- /*Switch task */
- if( xTaskIncrementTick() != pdFALSE )
- {
- vTaskSwitchContext();
- }
-
- /*Restore Context*/
- {
- __asm volatile("lw sp, pxCurrentTCB");
- __asm volatile("lw sp, 0x0(sp)");
-
- __asm volatile("lw t0, 31 * 4(sp)");
- __asm volatile("csrw mepc, t0");
-
- __asm volatile("lw x1, 0x0(sp)");
- __asm volatile("lw x4, 3 * 4(sp)");
- __asm volatile("lw x5, 4 * 4(sp)");
- __asm volatile("lw x6, 5 * 4(sp)");
- __asm volatile("lw x7, 6 * 4(sp)");
- __asm volatile("lw x8, 7 * 4(sp)");
- __asm volatile("lw x9, 8 * 4(sp)");
- __asm volatile("lw x10, 9 * 4(sp)");
- __asm volatile("lw x11, 10 * 4(sp)");
- __asm volatile("lw x12, 11 * 4(sp)");
- __asm volatile("lw x13, 12 * 4(sp)");
- __asm volatile("lw x14, 13 * 4(sp)");
- __asm volatile("lw x15, 14 * 4(sp)");
- __asm volatile("lw x16, 15 * 4(sp)");
- __asm volatile("lw x17, 16 * 4(sp)");
- __asm volatile("lw x18, 17 * 4(sp)");
- __asm volatile("lw x19, 18 * 4(sp)");
- __asm volatile("lw x20, 19 * 4(sp)");
- __asm volatile("lw x21, 20 * 4(sp)");
- __asm volatile("lw x22, 21 * 4(sp)");
- __asm volatile("lw x23, 22 * 4(sp)");
- __asm volatile("lw x24, 23 * 4(sp)");
- __asm volatile("lw x25, 24 * 4(sp)");
- __asm volatile("lw x26, 25 * 4(sp)");
- __asm volatile("lw x27, 26 * 4(sp)");
- __asm volatile("lw x28, 27 * 4(sp)");
- __asm volatile("lw x29, 28 * 4(sp)");
- __asm volatile("lw x30, 29 * 4(sp)");
- __asm volatile("lw x31, 30 * 4(sp)");
-
- __asm volatile("addi sp, sp, 4 * 32");
-
- __asm volatile("mret");
- }
-}
-uint32_t g_startscheduler = 0;
-BaseType_t xPortStartScheduler( void )
-{
- vPortSetupTimer();
- uxCriticalNesting = 0;
- g_startscheduler = 1;
- __enable_irq();
-
- raise_soft_interrupt();
-
- /*Should not get here*/
- return pdFALSE;
-}
-
-void Software_IRQHandler(void)
-{
- if(1 == g_startscheduler)
- {
- g_startscheduler = 2; //skip the save n switch context first time when scheduler is starting.
- }
- else
- {
- /*Save Context*/
- {
- __asm volatile("lw t0, pxCurrentTCB");
- __asm volatile("sw a2, 0x0(t0)");
- }
-
- vTaskSwitchContext();
- }
-
- /*Restore Context*/
- {
- __asm volatile("lw sp, pxCurrentTCB");
- __asm volatile("lw sp, 0x0(sp)");
-
- __asm volatile("lw t0, 31 * 4(sp)");
- __asm volatile("csrw mepc, t0");
-
- __asm volatile("lw x1, 0x0(sp)");
- __asm volatile("lw x4, 3 * 4(sp)");
- __asm volatile("lw x5, 4 * 4(sp)");
- __asm volatile("lw x6, 5 * 4(sp)");
- __asm volatile("lw x7, 6 * 4(sp)");
- __asm volatile("lw x8, 7 * 4(sp)");
- __asm volatile("lw x9, 8 * 4(sp)");
- __asm volatile("lw x10, 9 * 4(sp)");
- __asm volatile("lw x11, 10 * 4(sp)");
- __asm volatile("lw x12, 11 * 4(sp)");
- __asm volatile("lw x13, 12 * 4(sp)");
- __asm volatile("lw x14, 13 * 4(sp)");
- __asm volatile("lw x15, 14 * 4(sp)");
- __asm volatile("lw x16, 15 * 4(sp)");
- __asm volatile("lw x17, 16 * 4(sp)");
- __asm volatile("lw x18, 17 * 4(sp)");
- __asm volatile("lw x19, 18 * 4(sp)");
- __asm volatile("lw x20, 19 * 4(sp)");
- __asm volatile("lw x21, 20 * 4(sp)");
- __asm volatile("lw x22, 21 * 4(sp)");
- __asm volatile("lw x23, 22 * 4(sp)");
- __asm volatile("lw x24, 23 * 4(sp)");
- __asm volatile("lw x25, 24 * 4(sp)");
- __asm volatile("lw x26, 25 * 4(sp)");
- __asm volatile("lw x27, 26 * 4(sp)");
- __asm volatile("lw x28, 27 * 4(sp)");
- __asm volatile("lw x29, 28 * 4(sp)");
- __asm volatile("lw x30, 29 * 4(sp)");
- __asm volatile("lw x31, 30 * 4(sp)");
-
- __asm volatile("addi sp, sp, 4 * 32");
-
- //PRCI->MSIP[0] = 0x00;
-
- __asm volatile("addi sp, sp, -1*4");
- __asm volatile("sw t0, 0(sp)");
- __asm volatile("li t0, 0x44000000"); // address of PRCI->MSIP[0]
- __asm volatile("sw zero,0(t0)");
- __asm volatile("lw t0, 0(sp)");
- __asm volatile("addi sp, sp, 1*4");
-
- __asm volatile("mret");
- }
-}
-
-void vPortYield( void )
-{
- raise_soft_interrupt();
-}
-
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