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Diffstat (limited to 'libgloss/or1k/outbyte.S')
| -rw-r--r-- | libgloss/or1k/outbyte.S | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/libgloss/or1k/outbyte.S b/libgloss/or1k/outbyte.S new file mode 100644 index 000000000..2cd514855 --- /dev/null +++ b/libgloss/or1k/outbyte.S @@ -0,0 +1,34 @@ +/* outbyte.S -- Write one byte for OpenRISC 1000. + * + * Copyright (c) 2014 Authors + * + * Contributor Stefan Wallentowitz <stefan.wallentowitz@tum.de> + * + * The authors hereby grant permission to use, copy, modify, distribute, + * and license this software and its documentation for any purpose, provided + * that existing copyright notices are retained in all copies and that this + * notice is included verbatim in any distributions. No written agreement, + * license, or royalty fee is required for any of the authorized uses. + * Modifications to this software may be copyrighted by their authors + * and need not follow the licensing terms described here, provided that + * the new terms are clearly indicated on the first page of each file where + * they apply. + */ + +#include "include/or1k-asm.h" + +.global _or1k_outbyte + +.text +_or1k_outbyte: + LOAD_SYMBOL_2_GPR(r4,_or1k_board_uart_base) + l.lwz r4, 0(r4) + l.sfeq r4, r0 + OR1K_DELAYED_NOP(l.bf .Lnouart) +.Luart: + OR1K_DELAYED_NOP(l.j _or1k_uart_write) +.Lnouart: + OR1K_DELAYED( + OR1K_INST(l.nop 0x4), + OR1K_INST(l.jr r9) + ) |