qemu/roms/SLOF/board-qemu/llfw/board_io.S

   1 /******************************************************************************
   2  * Copyright (c) 2004, 2011 IBM Corporation
   3  * All rights reserved.
   4  * This program and the accompanying materials
   5  * are made available under the terms of the BSD License
   6  * which accompanies this distribution, and is available at
   7  * http://www.opensource.org/licenses/bsd-license.php
   8  *
   9  * Contributors:
  10  *     IBM Corporation - initial implementation
  11  *****************************************************************************/
  12
  13 #include <macros.h>
  14 #include <cpu.h>
  15
  16         .text
  17
  18 /****************************************************************************
  19  * prints one character to serial console
  20  *
  21  * Input:
  22  * R3 - character
  23  *
  24  * Returns: -
  25  *
  26  * Modifies Registers:
  27  * R3, R4, R5, R6, R7
  28  ****************************************************************************/
  29 ENTRY(io_putchar)
  30         sldi    r6,r3,(24+32)
  31         li      r3,0x58
  32         li      r4,0
  33         li      r5,1
  34         .long 0x44000022
  35         blr
  36
  37 ENTRY(io_getchar)
  38         mr      r10,r3
  39         li      r3,0x54
  40         li      r4,0
  41         .long 0x44000022
  42         mr.     r3,r4
  43         beq     1f
  44         srdi    r3,r5,(24+32)
  45         stb     r3,0(r10)
  46 1:      blr