FreeRTOS-Kernel/FreeRTOS/Source/portable/GCC/ColdFire_V2/portasm.S

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*/

/*
 * Purpose: Lowest level routines for all ColdFire processors.
 *
 * Notes:
 * 
 * ulPortSetIPL() and mcf5xxx_wr_cacr() copied with permission from FreeScale
 * supplied source files.
 */

    .global ulPortSetIPL
    .global mcf5xxx_wr_cacr
    .global __cs3_isr_interrupt_80
    .global vPortStartFirstTask

    .text

.macro portSAVE_CONTEXT

	lea.l		(-60, %sp), %sp
	movem.l		%d0-%fp, (%sp)
	move.l		pxCurrentTCB, %a0
	move.l		%sp, (%a0)

	.endm

.macro portRESTORE_CONTEXT

	move.l		pxCurrentTCB, %a0
	move.l		(%a0), %sp
	movem.l		(%sp), %d0-%fp
	lea.l		%sp@(60), %sp
	rte

	.endm

/********************************************************************/
/*
 * This routines changes the IPL to the value passed into the routine.
 * It also returns the old IPL value back.
 * Calling convention from C:
 *   old_ipl = asm_set_ipl(new_ipl);
 * For the Diab Data C compiler, it passes return value thru D0.
 * Note that only the least significant three bits of the passed
 * value are used.
 */

ulPortSetIPL:
    link    A6,#-8
    movem.l D6-D7,(SP)

    move.w  SR,D7       /* current sr    */

    move.l  D7,D0       /* prepare return value  */
    andi.l  #0x0700,D0  /* mask out IPL  */
    lsr.l   #8,D0       /* IPL   */

    move.l  8(A6),D6    /* get argument  */
    andi.l  #0x07,D6    /* least significant three bits  */
    lsl.l   #8,D6       /* move over to make mask    */

    andi.l  #0x0000F8FF,D7  /* zero out current IPL  */
    or.l    D6,D7           /* place new IPL in sr   */
    move.w  D7,SR

    movem.l (SP),D6-D7
    lea     8(SP),SP
    unlk    A6
    rts
/********************************************************************/

mcf5xxx_wr_cacr:
    move.l  4(sp),d0
    .long   0x4e7b0002  /* movec d0,cacr   */
    nop
    rts

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

/* Yield interrupt. */
__cs3_isr_interrupt_80:
	portSAVE_CONTEXT
	jsr vPortYieldHandler
	portRESTORE_CONTEXT

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


vPortStartFirstTask:
	portRESTORE_CONTEXT

    .end