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Annotation of qemu/roms/SLOF/board-js2x/llfw/board_io.S, revision 1.1

1.1     ! root        1: /******************************************************************************
        !             2:  * Copyright (c) 2004, 2008 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: C_ENTRY(copy_from_flash)
        !            19: # size in GPR3 (multiple of 64), from GPR4, to GPR5
        !            20:        mflr 24 ; mtctr 3 ; addi 4,4,-64 ; addi 5,5,-64
        !            21: 0:     SETCI(r0)
        !            22:        ldu 16,64(4) ; ld 17,8(4) ; ld 18,16(4) ; ld 19,24(4)
        !            23:        ld 20,32(4) ; ld 21,40(4) ; ld 22,48(4) ; ld 23,56(4)
        !            24:        CLRCI(r0)
        !            25:        stdu 16,64(5) ; std 17,8(5) ; std 18,16(5) ; std 19,24(5)
        !            26:        std 20,32(5) ; std 21,40(5) ; std 22,48(5) ; std 23,56(5)
        !            27:        sync ; icbi 0,2 ; bdnz 0b ; sync ; isync ; mtlr 24 ; blr
        !            28: 
        !            29: /****************************************************************************
        !            30:  * prints one character to serial console
        !            31:  *
        !            32:  * Input:
        !            33:  * R3 - character
        !            34:  *
        !            35:  * Returns: -
        !            36:  *
        !            37:  * Modifies Registers:
        !            38:  * R3, R4, R5, R6, R7
        !            39:  ****************************************************************************/
        !            40: ENTRY(io_putchar)
        !            41:        mflr    r7
        !            42: 
        !            43:        SETCI(r0)
        !            44: 
        !            45:        # always use serial1
        !            46:        li 4,0x3f8 ; oris 4,4,0xf400
        !            47: 
        !            48:        # print one char
        !            49: 0:     lbz 0,5(4) ; andi. 0,0,0x20 ; beq 0b ; stb 3,0(4) ; eieio 
        !            50: 
        !            51:        # also print char to serial2 if on a JS21
        !            52:        # read ID register: only if it is a PC87427 (JS21) also use serial2
        !            53:        addi 4,4,-0x3f8
        !            54:        li 5,0x20 ; stb 5,0x2e(4) ; lbz 5,0x2f(4) ; cmpdi 5,0xf2 ; bne 1f
        !            55: 
        !            56:        addi 4,4,0x2f8
        !            57: 0:     lbz 0,5(4) ; andi. 0,0,0x20 ; beq 0b ; stb 3,0(4) ; eieio 
        !            58: 
        !            59: 1:     CLRCI(r0)
        !            60: 
        !            61:        mtlr    r7
        !            62:        blr

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