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/*
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* File: mcf5xxx.s
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* Purpose: Lowest level routines for all ColdFire processors.
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*
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* Notes:
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*
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* Function copied from mcf5xxx.S provided by FreeScale.
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*/
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.global ulPortSetIPL
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.global mcf5xxx_wr_cacr
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.global __cs3_isr_interrupt_127
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.global vPortStartFirstTask
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.text
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.macro portSAVE_CONTEXT
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lea.l (-60, %sp), %sp
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movem.l %d0-%fp, (%sp)
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move.l pxCurrentTCB, %a0
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move.l %sp, (%a0)
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.endm
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.macro portRESTORE_CONTEXT
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move.l pxCurrentTCB, %a0
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move.l (%a0), %sp
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movem.l (%sp), %d0-%fp
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lea.l %sp@(60), %sp
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rte
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.endm
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/********************************************************************/
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/*
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* This routines changes the IPL to the value passed into the routine.
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* It also returns the old IPL value back.
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* Calling convention from C:
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* old_ipl = asm_set_ipl(new_ipl);
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* For the Diab Data C compiler, it passes return value thru D0.
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* Note that only the least significant three bits of the passed
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* value are used.
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*/
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ulPortSetIPL:
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link A6,#-8
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movem.l D6-D7,(SP)
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move.w SR,D7 /* current sr */
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move.l D7,D0 /* prepare return value */
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andi.l #0x0700,D0 /* mask out IPL */
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lsr.l #8,D0 /* IPL */
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move.l 8(A6),D6 /* get argument */
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andi.l #0x07,D6 /* least significant three bits */
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lsl.l #8,D6 /* move over to make mask */
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andi.l #0x0000F8FF,D7 /* zero out current IPL */
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or.l D6,D7 /* place new IPL in sr */
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move.w D7,SR
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movem.l (SP),D6-D7
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lea 8(SP),SP
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unlk A6
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rts
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/********************************************************************/
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mcf5xxx_wr_cacr:
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move.l 4(sp),d0
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.long 0x4e7b0002 /* movec d0,cacr */
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nop
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rts
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/********************************************************************/
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/* Yield interrupt. */
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__cs3_isr_interrupt_127:
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portSAVE_CONTEXT
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jsr vPortYieldHandler
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portRESTORE_CONTEXT
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/********************************************************************/
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vPortStartFirstTask:
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portRESTORE_CONTEXT
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.end
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