35 lines
1.0 KiB
ArmAsm
35 lines
1.0 KiB
ArmAsm
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/* outbyte.S -- Write one byte for OpenRISC 1000.
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*
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* Copyright (c) 2014 Authors
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*
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* Contributor Stefan Wallentowitz <stefan.wallentowitz@tum.de>
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#include "include/or1k-asm.h"
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.global _or1k_outbyte
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.text
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_or1k_outbyte:
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LOAD_SYMBOL_2_GPR(r4,_or1k_board_uart_base)
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l.lwz r4, 0(r4)
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l.sfeq r4, r0
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OR1K_DELAYED_NOP(l.bf .Lnouart)
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.Luart:
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OR1K_DELAYED_NOP(l.j _or1k_uart_write)
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.Lnouart:
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OR1K_DELAYED(
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OR1K_INST(l.nop 0x4),
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OR1K_INST(l.jr r9)
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)
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