Subversion Repositories openrisc_me

/* mvme.S -- board support for m68k
 *
 * Copyright (c) 1995, 1996 Cygnus Support
 *
 * 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 "asm.h"

        .title "mvme.S for m68k-coff"

        .align  2
        .text
        .global SYM (_exit)
        .global SYM (outln)
        .global SYM (outbyte)
        .global SYM (putDebugChar)
        .global SYM (inbyte)
        .global SYM (getDebugChar)
        .global SYM (havebyte)
        .global SYM (exceptionHandler)

        .set    vbr_size, 0x400
        .comm   SYM (vbr_table), vbr_size

/*
 * _exit -- Exit from the application. Normally we cause a user trap
 *          to return to the ROM monitor for another run.
 */
SYM (_exit):
        unlk    a6
        trap IMM(15)
        .word return

        .align  2

/*
 * inbyte -- get a byte from the serial port
 *      d0 - contains the byte read in
 */
        .align  2
SYM (getDebugChar):             /* symbol name used by m68k-stub */
SYM (inbyte):
        link    a6, IMM(-8)
        trap    IMM(15)
        .word   inchr
        moveb   sp@, d0
        extw    d0
        extl    d0
        unlk    a6
        rts

/*
 * outbyte -- sends a byte out the serial port
 *      d0 - contains the byte to be sent
 */
        .align  2
SYM (putDebugChar):             /* symbol name used by m68k-stub */
SYM (outbyte):
        link    fp, IMM(-4)
        moveb   fp@(11), sp@
        trap    IMM(15)
        .word   outchr
        unlk    fp
        rts

/*
 * outln -- sends a string of bytes out the serial port with a CR/LF
 *      a0 - contains the address of the string's first byte
 *      a1 - contains the address of the string's last byte
 */
        .align  2
SYM (outln):
        link    a6, IMM(-8)
        moveml  a0/a1, sp@
        trap    IMM(15)
        .word   outln
        unlk    a6
        rts

/*
 * outstr -- sends a string of bytes out the serial port without a CR/LF
 *      a0 - contains the address of the string's first byte
 *      a1 - contains the address of the string's last byte
 */
        .align  2
SYM (outstr):
        link    a6, IMM(-8)
        moveml  a0/a1, sp@
        trap    IMM(15)
        .word   outstr
        unlk    a6
        rts

/*
 * havebyte -- checks to see if there is a byte in the serial port,
 *             returns 1 if there is a byte, 0 otherwise.
 */
SYM (havebyte):
        trap    IMM(15)
        .word   instat
        beqs    empty
        movel   IMM(1), d0
        rts
empty:
        movel   IMM(0), d0
        rts

/*
 * These constants are for the MVME-135 board's boot monitor. They
 * are used with a TRAP 15 call to access the monitor's I/O routines.
 * they must be in the word following the trap call.
 */
        .set inchr, 0x0
        .set instat, 0x1
        .set inln, 0x2
        .set readstr, 0x3
        .set readln, 0x4
        .set chkbrk, 0x5

        .set outchr, 0x20
        .set outstr, 0x21
        .set outln, 0x22
        .set write, 0x23
        .set writeln, 0x24
        .set writdln, 0x25
        .set pcrlf, 0x26
        .set eraseln, 0x27
        .set writd, 0x28
        .set sndbrk, 0x29

        .set tm_ini, 0x40
        .set dt_ini, 0x42
        .set tm_disp, 0x43
        .set tm_rd, 0x44

        .set redir, 0x60
        .set redir_i, 0x61
        .set redir_o, 0x62
        .set return, 0x63
        .set bindec, 0x64

        .set changev, 0x67
        .set strcmp, 0x68
        .set mulu32, 0x69
        .set divu32, 0x6A
        .set chk_sum, 0x6B