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Annotation of qemu/roms/SLOF/board-js2x/llfw/board_io.S, revision 1.1.1.1

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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