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Annotation of kernel/bsd/dev/ppc/video_scroll.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*
        !            26:  * Copyright 1996 1995 by Open Software Foundation, Inc. 1997 1996 1995 1994 1993 1992 1991  
        !            27:  *              All Rights Reserved 
        !            28:  *  
        !            29:  * Permission to use, copy, modify, and distribute this software and 
        !            30:  * its documentation for any purpose and without fee is hereby granted, 
        !            31:  * provided that the above copyright notice appears in all copies and 
        !            32:  * that both the copyright notice and this permission notice appear in 
        !            33:  * supporting documentation. 
        !            34:  *  
        !            35:  * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 
        !            36:  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
        !            37:  * FOR A PARTICULAR PURPOSE. 
        !            38:  *  
        !            39:  * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR 
        !            40:  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 
        !            41:  * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, 
        !            42:  * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 
        !            43:  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 
        !            44:  * 
        !            45:  */
        !            46: /*
        !            47:  * MKLINUX-1.0DR2
        !            48:  */
        !            49: 
        !            50: /* Routines to perform high-speed scrolling, assuming that the memory is
        !            51:  * non-cached, and that the amount of memory to be scrolled is a multiple
        !            52:  * of (at least) 16.
        !            53:  */
        !            54: 
        !            55: #if 1 //notdef_next
        !            56: #include <ppc/asm.h>
        !            57: #include <ppc/proc_reg.h>
        !            58: 
        !            59: /*
        !            60:  * void video_scroll_up(unsigned long start,
        !            61:  *              unsigned long end,
        !            62:  *              unsigned long dest)
        !            63:  */
        !            64: 
        !            65: ENTRY(video_scroll_up, TAG_NO_FRAME_USED)
        !            66:     
        !            67:     /*
        !            68:      * Turn the FPU on, save regs
        !            69:      */
        !            70:     mfmsr      ARG4
        !            71:     ori        ARG3,   ARG4,   MASK(MSR_FP)    /* bit is in low-order 16 */
        !            72:     mtmsr      ARG3
        !            73:     isync
        !            74: 
        !            75:     stfd       f0, -16(r1)
        !            76:     stfd       f1, -8(r1)
        !            77: 
        !            78:     /* ok, now we can use the FPU registers to do some fast copying,
        !            79:      * maybe this can be more optimal but it's not bad
        !            80:      */
        !            81: 
        !            82: .L_vscr_up_loop:
        !            83:     lfd f0, 0(ARG0)
        !            84:     lfd f1, 8(ARG0)
        !            85: 
        !            86:     addi    ARG0,   ARG0,   16
        !            87:     
        !            88:     stfd    f0, 0(ARG2)
        !            89: 
        !            90:     cmp    CR0,0,    ARG0,   ARG1
        !            91: 
        !            92:     stfd    f1, 8(ARG2)
        !            93: 
        !            94:     addi    ARG2,   ARG2,   16
        !            95: 
        !            96:     blt+    CR0,    .L_vscr_up_loop
        !            97: 
        !            98:     lfd                f0, -16(r1)
        !            99:     lfd                f1, -8(r1)
        !           100: 
        !           101:     /* re-disable the FPU */
        !           102:     sync
        !           103:     mtmsr   ARG4
        !           104:     isync
        !           105:     
        !           106:     blr
        !           107: 
        !           108: /*
        !           109:  * void video_scroll_down(unsigned long start,   HIGH address to scroll from
        !           110:  *                unsigned long end,     LOW address 
        !           111:  *                unsigned long dest)    HIGH address
        !           112:  */
        !           113: 
        !           114: ENTRY(video_scroll_down, TAG_NO_FRAME_USED)
        !           115: 
        !           116:     /*
        !           117:      * Turn the FPU on, save regs
        !           118:      */
        !           119:     mfmsr      ARG4
        !           120:     ori        ARG3,   ARG4,   MASK(MSR_FP)    /* bit is in low-order 16 */
        !           121:     mtmsr      ARG3
        !           122:     isync
        !           123: 
        !           124:     stfd       f0, -16(r1)
        !           125:     stfd       f1, -8(r1)
        !           126: 
        !           127:     /* ok, now we can use the FPU registers to do some fast copying,
        !           128:      * maybe this can be more optimal but it's not bad
        !           129:      */
        !           130: 
        !           131: .L_vscr_down_loop:
        !           132:     lfd f0, -16(ARG0)
        !           133:     lfd f1, -8(ARG0)
        !           134: 
        !           135:     subi    ARG0,   ARG0,   16
        !           136:     
        !           137:     stfd    f0, -16(ARG2)
        !           138: 
        !           139:     cmp    CR0,0,    ARG0,   ARG1
        !           140: 
        !           141:     stfd    f1, -8(ARG2)
        !           142: 
        !           143:     subi    ARG2,   ARG2,   16
        !           144: 
        !           145:     bgt+    CR0,    .L_vscr_down_loop
        !           146: 
        !           147:     lfd                f0, -16(r1)
        !           148:     lfd                f1, -8(r1)
        !           149: 
        !           150:     /* re-disable the FPU */
        !           151:     sync
        !           152:     mtmsr   ARG4
        !           153:     isync
        !           154:     
        !           155:     blr
        !           156: #endif notdef_next
        !           157: 

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