dtu_simple/app/FreeRTOS-8.2.3/portable/IAR/ARM_CM4F/portasm.s

/*
    FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd.
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    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.

    ***************************************************************************
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    >>!   outside of the FreeRTOS kernel.                                   !<<
    ***************************************************************************

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    ***************************************************************************
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*/

#include <FreeRTOSConfig.h>

	RSEG    CODE:CODE(2)
	thumb

	EXTERN pxCurrentTCB
	EXTERN vTaskSwitchContext

	PUBLIC xPortPendSVHandler
	PUBLIC vPortSVCHandler
	PUBLIC vPortStartFirstTask
	PUBLIC vPortEnableVFP


/*-----------------------------------------------------------*/

xPortPendSVHandler:
	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
	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
	#ifdef WORKAROUND_PMU_CM001 /* XMC4000 specific errata */
		#if WORKAROUND_PMU_CM001 == 1
			push { r14 }
			pop { pc }
		#endif
	#endif

	bx r14


/*-----------------------------------------------------------*/

vPortSVCHandler:
	/* 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

/*-----------------------------------------------------------*/

vPortStartFirstTask
	/* Use the NVIC offset register to locate the stack. */
	ldr r0, =0xE000ED08
	ldr r0, [r0]
	ldr r0, [r0]
	/* Set the msp back to the start of the stack. */
	msr msp, r0
	/* Call SVC to start the first task. */
	cpsie i
	cpsie f
	dsb
	isb
	svc 0

/*-----------------------------------------------------------*/

vPortEnableVFP:
	/* The FPU enable bits are in the CPACR. */
	ldr.w r0, =0xE000ED88
	ldr	r1, [r0]

	/* Enable CP10 and CP11 coprocessors, then save back. */
	orr	r1, r1, #( 0xf << 20 )
	str r1, [r0]
	bx	r14



	END