68 lines
1.4 KiB
NASM
68 lines
1.4 KiB
NASM
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; Copyright (C) 2014 Renesas Electronics Corporation
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; RENESAS ELECTRONICS CONFIDENTIAL AND PROPRIETARY.
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; This program must be used solely for the purpose for which
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; it was furnished by Renesas Electronics Corporation. No part of this
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; program may be reproduced or disclosed to others, in any
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; form, without the prior written permission of Renesas Electronics
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; Corporation.
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;---------------------------------------------------------------------
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; _stkinit
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;
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; void _stkinit(void __near * stackbss);
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;
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; input:
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; stackbss = AX (#LOWW(_stackend))
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; output:
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; NONE
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;---------------------------------------------------------------------
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; NOTE : THIS IS A TYPICAL EXAMPLE.
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.PUBLIC _stkinit
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.textf .CSEG TEXTF
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_stkinit:
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MOVW HL,AX ; stack_end_addr
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MOV [SP+3],#0x00 ; [SP+0]-[SP+2] for return address
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MOVW AX,SP
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SUBW AX,HL ; SUBW AX,#LOWW _@STEND
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BNH $LSTINIT3 ; goto end
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SHRW AX,5 ; loop count for 32 byte transfer
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MOVW BC,AX
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CLRW AX
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LSTINIT1:
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CMPW AX,BC
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BZ $LSTINIT2
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MOVW [HL],AX
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MOVW [HL+2],AX
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MOVW [HL+4],AX
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MOVW [HL+6],AX
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MOVW [HL+8],AX
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MOVW [HL+10],AX
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MOVW [HL+12],AX
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MOVW [HL+14],AX
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MOVW [HL+16],AX
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MOVW [HL+18],AX
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MOVW [HL+20],AX
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MOVW [HL+22],AX
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MOVW [HL+24],AX
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MOVW [HL+26],AX
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MOVW [HL+28],AX
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MOVW [HL+30],AX
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XCHW AX,HL
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ADDW AX,#0x20
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XCHW AX,HL
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DECW BC
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BR $LSTINIT1
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LSTINIT2:
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MOVW AX,SP
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CMPW AX,HL
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BZ $LSTINIT3 ; goto end
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CLRW AX
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MOVW [HL],AX
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INCW HL
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INCW HL
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BR $LSTINIT2
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LSTINIT3:
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RET
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