#------------------------------------------------------------------------------
#  /etc/rc.d/rc930.setcyrix - cyrix cpu optimization               __FLI4LVER__
#
#  Creation:     31.01.2004 mp
#  Last Update:  $Id$
#
#  Copyright (c) 2004 Maximilian Pasternak
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#------------------------------------------------------------------------------

if [ "$OPT_SETCYRIX" = yes ]
then
    begin_script SETCYRIX

    echo -n "Cyrix 6x86: Suspend-on-Halt, "
    /usr/local/bin/set6x86 -p 0xC2 -s 0x08

    # MAPEN (access to CCR4/5 enabled -- needed for settings below)
    /usr/local/bin/set6x86 -p 0xC3 -s 0x10

    echo -n "Enable Memory Bypass, "
    /usr/local/bin/set6x86 -p 0xE8 -s 0x80

    echo -n "Enable DTE, "
    /usr/local/bin/set6x86 -p 0xE8 -s 0x10

    echo -n "Fast FPU, "
    /usr/local/bin/set6x86 -p 0xE8 -s 0x20

    echo -n "Disable LSSER, "
    /usr/local/bin/set6x86 -p 0x20 -c 0x80

    echo -n "Enable Incrementor, "
    if [ "$SETCYRIX_CPUSPEED" != none ]
    then
        if [ "$SETCYRIX_CPUSPEED" -ge 300 ]
        then
            /usr/local/bin/set6x86 -p 0xF0 -s 0x02
            /usr/local/bin/set6x86 -p 0x20 -s 0x05
        else
            /usr/local/bin/set6x86 -p 0xF0 -s 0x02
            /usr/local/bin/set6x86 -p 0x20 -s 0x04
        fi
    fi

    # Don't reset SLOP here, as this would require a kernel delay loop
    # recalibration, which can only be done inside the kernel
    #echo -n "Fast LOOP, "
    #/usr/local/bin/set6x86 -p 0xE9 -c 0x02


    if [ "$SETCYRIX_VIDMEM" = yes ]
    then
        # This enables some performance features for the linear memory mapped
        # VGA memory buffer, assuming it's on address 0xE0000000.
        #
        # On some systems, memory bandwidth goes from 44 MB/sec to 78 MB/sec.
        #
        # It is disabled here, because this is very system-dependent.
        #
        echo -n "Fast Lin. VidMem."
        /usr/local/bin/set6x86 -p 0xD6 0xE0
        /usr/local/bin/set6x86 -p 0xD7 0x00
        /usr/local/bin/set6x86 -p 0xD8 0x0A
        /usr/local/bin/set6x86 -p 0xE2 0x09
    fi

    # MAPEN (disable access to CCR4/5)
    /usr/local/bin/set6x86 -p 0xC3 -c 0x10

    echo
    
    end_script
fi