From a5b65b0066b63468f09e0d714079f4603fb84dae Mon Sep 17 00:00:00 2001
From: Richard Barry <ribarry@amazon.com>
Date: Fri, 24 Feb 2012 12:05:01 +0000
Subject: [PATCH] Added IAR port layer for the Cortex-M0.
---
Source/portable/IAR/ARM_CM0/port.c | 208 ++++++++++++++++++++++++
Source/portable/IAR/ARM_CM0/portasm.s | 155 ++++++++++++++++++
Source/portable/IAR/ARM_CM0/portmacro.h | 131 +++++++++++++++
3 files changed, 494 insertions(+)
create mode 100644 Source/portable/IAR/ARM_CM0/port.c
create mode 100644 Source/portable/IAR/ARM_CM0/portasm.s
create mode 100644 Source/portable/IAR/ARM_CM0/portmacro.h
diff --git a/Source/portable/IAR/ARM_CM0/port.c b/Source/portable/IAR/ARM_CM0/port.c
new file mode 100644
index 0000000000..55665d7e0b
--- /dev/null
+++ b/Source/portable/IAR/ARM_CM0/port.c
@@ -0,0 +1,208 @@
+/*
+ FreeRTOS V7.1.0 - Copyright (C) 2011 Real Time Engineers Ltd.
+
+
+ ***************************************************************************
+ * *
+ * FreeRTOS tutorial books are available in pdf and paperback. *
+ * Complete, revised, and edited pdf reference manuals are also *
+ * available. *
+ * *
+ * Purchasing FreeRTOS documentation will not only help you, by *
+ * ensuring you get running as quickly as possible and with an *
+ * in-depth knowledge of how to use FreeRTOS, it will also help *
+ * the FreeRTOS project to continue with its mission of providing *
+ * professional grade, cross platform, de facto standard solutions *
+ * for microcontrollers - completely free of charge! *
+ * *
+ * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
+ * *
+ * Thank you for using FreeRTOS, and 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 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. 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 CM0 port.
+ *----------------------------------------------------------*/
+
+/* Scheduler includes. */
+#include "FreeRTOS.h"
+#include "task.h"
+
+/* 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 portMIN_INTERRUPT_PRIORITY ( 255UL )
+#define portNVIC_PENDSV_PRI ( portMIN_INTERRUPT_PRIORITY << 16UL )
+#define portNVIC_SYSTICK_PRI ( portMIN_INTERRUPT_PRIORITY << 24UL )
+
+/* Constants required to set up the initial stack. */
+#define portINITIAL_XPSR ( 0x01000000 )
+
+/* For backward compatibility, ensure configKERNEL_INTERRUPT_PRIORITY is
+defined. The value 255 should also ensure backward compatibility.
+FreeRTOS.org versions prior to V4.3.0 did not include this definition. */
+#ifndef configKERNEL_INTERRUPT_PRIORITY
+ #define configKERNEL_INTERRUPT_PRIORITY 0
+#endif
+
+/* 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 xPortSysTickHandler( void );
+
+/*
+ * Start first task is a separate function so it can be tested in isolation.
+ */
+extern void vPortStartFirstTask( void );
+
+/*-----------------------------------------------------------*/
+
+/*
+ * 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 -= 6; /* LR, R12, R3..R1 */
+ *pxTopOfStack = ( portSTACK_TYPE ) pvParameters; /* R0 */
+ pxTopOfStack -= 8; /* R11..R4. */
+
+ return pxTopOfStack;
+}
+/*-----------------------------------------------------------*/
+
+/*
+ * See header file for description.
+ */
+portBASE_TYPE xPortStartScheduler( void )
+{
+ /* Make PendSV and SysTick the lowest priority interrupts. */
+ *(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 CM0 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 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.
+ */
+static 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;
+}
+/*-----------------------------------------------------------*/
+
diff --git a/Source/portable/IAR/ARM_CM0/portasm.s b/Source/portable/IAR/ARM_CM0/portasm.s
new file mode 100644
index 0000000000..966d976206
--- /dev/null
+++ b/Source/portable/IAR/ARM_CM0/portasm.s
@@ -0,0 +1,155 @@
+/*
+ FreeRTOS V7.1.0 - Copyright (C) 2011 Real Time Engineers Ltd.
+
+
+ ***************************************************************************
+ * *
+ * FreeRTOS tutorial books are available in pdf and paperback. *
+ * Complete, revised, and edited pdf reference manuals are also *
+ * available. *
+ * *
+ * Purchasing FreeRTOS documentation will not only help you, by *
+ * ensuring you get running as quickly as possible and with an *
+ * in-depth knowledge of how to use FreeRTOS, it will also help *
+ * the FreeRTOS project to continue with its mission of providing *
+ * professional grade, cross platform, de facto standard solutions *
+ * for microcontrollers - completely free of charge! *
+ * *
+ * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
+ * *
+ * Thank you for using FreeRTOS, and 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 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. 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.
+*/
+
+#include <FreeRTOSConfig.h>
+
+/* For backward compatibility, ensure configKERNEL_INTERRUPT_PRIORITY is
+defined. The value zero should also ensure backward compatibility.
+FreeRTOS.org versions prior to V4.3.0 did not include this definition. */
+#ifndef configKERNEL_INTERRUPT_PRIORITY
+ #define configKERNEL_INTERRUPT_PRIORITY 0
+#endif
+
+
+ RSEG CODE:CODE(2)
+ thumb
+
+ EXTERN vPortYieldFromISR
+ EXTERN pxCurrentTCB
+ EXTERN vTaskSwitchContext
+
+ PUBLIC vSetMSP
+ PUBLIC xPortPendSVHandler
+ PUBLIC vPortSVCHandler
+ PUBLIC vPortStartFirstTask
+
+
+/*-----------------------------------------------------------*/
+
+vSetMSP
+ msr msp, r0
+ bx lr
+
+/*-----------------------------------------------------------*/
+
+xPortPendSVHandler:
+ mrs r0, psp
+
+ ldr r3, =pxCurrentTCB /* Get the location of the current TCB. */
+ ldr r2, [r3]
+
+ subs r0, 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}
+ cpsid i
+ bl vTaskSwitchContext
+ cpsie i
+ 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, 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, r0, #32 /* Go back for the low registers that are not automatically restored. */
+ ldmia r0!, {r4-r7} /* Pop low registers. */
+
+ bx r3
+
+/*-----------------------------------------------------------*/
+
+vPortSVCHandler;
+ ldr r3, =pxCurrentTCB /* Restore the context. */
+ ldr r1, [r3] /* Get the pxCurrentTCB address. */
+ ldr r0, [r1] /* The first item in pxCurrentTCB is the task top of stack. */
+ adds r0, 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, r0, #32 /* Go back for the low registers that are not automatically restored. */
+ ldmia r0!, {r4-r7} /* Pop low registers. */
+ mov r1, r14 /* OR R14 with 0x0d. */
+ movs r0, #0x0d
+ orrs r1, r0
+ bx r1
+
+/*-----------------------------------------------------------*/
+
+vPortStartFirstTask
+ movs r0, #0x00 /* Locate the top of stack. */
+ ldr r0, [r0]
+ msr msp, r0 /* Set the msp back to the start of the stack. */
+ cpsie i /* Globally enable interrupts. */
+ svc 0 /* System call to start first task. */
+ nop
+
+ END
+
\ No newline at end of file
diff --git a/Source/portable/IAR/ARM_CM0/portmacro.h b/Source/portable/IAR/ARM_CM0/portmacro.h
new file mode 100644
index 0000000000..806e99d2d2
--- /dev/null
+++ b/Source/portable/IAR/ARM_CM0/portmacro.h
@@ -0,0 +1,131 @@
+/*
+ FreeRTOS V7.1.0 - Copyright (C) 2011 Real Time Engineers Ltd.
+
+
+ ***************************************************************************
+ * *
+ * FreeRTOS tutorial books are available in pdf and paperback. *
+ * Complete, revised, and edited pdf reference manuals are also *
+ * available. *
+ * *
+ * Purchasing FreeRTOS documentation will not only help you, by *
+ * ensuring you get running as quickly as possible and with an *
+ * in-depth knowledge of how to use FreeRTOS, it will also help *
+ * the FreeRTOS project to continue with its mission of providing *
+ * professional grade, cross platform, de facto standard solutions *
+ * for microcontrollers - completely free of charge! *
+ * *
+ * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
+ * *
+ * Thank you for using FreeRTOS, and 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 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. 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.
+*/
+
+
+#ifndef PORTMACRO_H
+#define PORTMACRO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*-----------------------------------------------------------
+ * Port specific definitions.
+ *
+ * The settings in this file configure FreeRTOS correctly for the
+ * given hardware and compiler.
+ *
+ * These settings should not be altered.
+ *-----------------------------------------------------------
+ */
+
+/* Type definitions. */
+#define portCHAR char
+#define portFLOAT float
+#define portDOUBLE double
+#define portLONG long
+#define portSHORT short
+#define portSTACK_TYPE unsigned portLONG
+#define portBASE_TYPE long
+
+#if( configUSE_16_BIT_TICKS == 1 )
+ typedef unsigned portSHORT portTickType;
+ #define portMAX_DELAY ( portTickType ) 0xffff
+#else
+ typedef unsigned portLONG portTickType;
+ #define portMAX_DELAY ( portTickType ) 0xffffffff
+#endif
+/*-----------------------------------------------------------*/
+
+/* Architecture specifics. */
+#define portSTACK_GROWTH ( -1 )
+#define portTICK_RATE_MS ( ( portTickType ) 1000 / configTICK_RATE_HZ )
+#define portBYTE_ALIGNMENT 8
+/*-----------------------------------------------------------*/
+
+
+/* Scheduler utilities. */
+extern void vPortYieldFromISR( void );
+
+#define portYIELD() vPortYieldFromISR()
+
+#define portEND_SWITCHING_ISR( xSwitchRequired ) if( xSwitchRequired ) vPortYieldFromISR()
+/*-----------------------------------------------------------*/
+
+
+/* Critical section management. */
+
+extern void vPortEnterCritical( void );
+extern void vPortExitCritical( void );
+
+#define portDISABLE_INTERRUPTS() __asm volatile( "cpsid i" )
+#define portENABLE_INTERRUPTS() __asm volatile( "cpsie i" )
+#define portENTER_CRITICAL() vPortEnterCritical()
+#define portEXIT_CRITICAL() vPortExitCritical()
+#define portSET_INTERRUPT_MASK_FROM_ISR() 0;portDISABLE_INTERRUPTS()
+#define portCLEAR_INTERRUPT_MASK_FROM_ISR(x) portENABLE_INTERRUPTS();(void)x
+
+/*-----------------------------------------------------------*/
+
+/* Task function macros as described on the FreeRTOS.org WEB site. */
+#define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void *pvParameters )
+#define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void *pvParameters )
+
+#define portNOP()
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PORTMACRO_H */
+