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Annotation of qemu/roms/SLOF/board-qemu/llfw/board_io.S, revision 1.1.1.1

1.1       root        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

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