osfmk/console/ppc/video_scroll.s

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_FREE_COPYRIGHT@
  30  *
  31  */
  32
  33 /* Routines to perform high-speed scrolling, assuming that the memory is
  34  * non-cached, and that the amount of memory to be scrolled is a multiple
  35  * of (at least) 16.
  36  */
  37
  38 #include <ppc/asm.h>
  39 #include <ppc/proc_reg.h>
  40
  41 /*
  42  * void video_scroll_up(unsigned long start,
  43  *                      unsigned long end,
  44  *                      unsigned long dest)
  45  */
  46
  47 ENTRY(video_scroll_up, TAG_NO_FRAME_USED)
  48
  49                         mfmsr   r0                                                                      /* Get the MSR */
  50                         mflr    r6                                                                      /* Get the LR */
  51                         ori             r7,r0,1<<(31-MSR_FP_BIT)                        /* Turn on floating point */
  52                         stwu    r1,-(FM_SIZE+16)(r1)                            /* Get space for a couple of registers on stack */
  53                         rlwinm  r7,r7,0,MSR_EE_BIT+1,MSR_EE_BIT-1       /* Turn off interrupts */
  54                         stw             r6,(FM_SIZE+16+FM_LR_SAVE)(r1)          /* Save the return */
  55
  56                         mtmsr   r7                                                                      /* Turn on FPU */
  57                         isync                                                                           /* Wait for it */
  58
  59 vsufpuon1:      stfd    f0,(FM_SIZE+0)(r1)                                      /* Save one register */
  60                         stfd    f1,(FM_SIZE+8)(r1)                                      /* and the second */
  61
  62 /* ok, now we can use the FPU registers to do some fast copying
  63  */
  64
  65 .L_vscr_up_loop:
  66                         lfd     f0,     0(r3)
  67                         lfd     f1,     8(r3)
  68
  69                         addi    r3,     r3,     16
  70
  71                         stfd    f0,     0(r5)
  72
  73                         cmpl    cr0,    r3,     r4
  74
  75                         stfd    f1,     8(r5)
  76
  77                         addi    r5,     r5,     16
  78
  79                         blt+    cr0,    .L_vscr_up_loop
  80
  81                         lfd             f0,(FM_SIZE+0)(r1)                                      /* Load back one register */
  82                         lfd             f1,(FM_SIZE+8)(r1)                                      /* and the second */
  83                         lwz             r1,0(r1)                                                        /* Pop the stack */
  84
  85                         mtmsr   r0                                                                      /* Turn off FPU again */
  86                         isync                                                                           /* Wait for it */
  87                         blr                                                                                     /* Go away, don't bother me... */
  88
  89
  90 /*
  91  * void video_scroll_down(unsigned long start,   HIGH address to scroll from
  92  *                        unsigned long end,     LOW address
  93  *                        unsigned long dest)    HIGH address
  94  */
  95
  96 ENTRY(video_scroll_down, TAG_NO_FRAME_USED)
  97
  98         /* Save off the link register, we want to call fpu_save.
  99          */
 100
 101
 102                         mfmsr   r0                                                                      /* Get the MSR */
 103                         mflr    r6                                                                      /* Get the LR */
 104                         ori             r7,r0,1<<(31-MSR_FP_BIT)                        /* Turn on floating point */
 105                         stwu    r1,-(FM_SIZE+16)(r1)                            /* Get space for a couple of registers on stack */
 106                         rlwinm  r7,r7,0,MSR_EE_BIT+1,MSR_EE_BIT-1       /* Turn off interrupts */
 107                         stw             r6,(FM_SIZE+16+FM_LR_SAVE)(r1)          /* Save the return */
 108
 109                         mtmsr   r7                                                                      /* Turn on FPU */
 110                         isync                                                                           /* Wait for it */
 111
 112 vsdfpuon1:      stfd    f0,(FM_SIZE+0)(r1)                                      /* Save one register */
 113                         stfd    f1,(FM_SIZE+8)(r1)                                      /* and the second */
 114
 115 /* ok, now we can use the FPU registers to do some fast copying  */
 116
 117 .L_vscr_down_loop:
 118                         lfd     f0,     -16(r3)
 119                         lfd     f1,     -8(r3)
 120
 121                         subi    r3,     r3,     16
 122
 123                         stfd    f0,     -16(r5)
 124
 125                         cmpl    cr0,    r3,     r4
 126
 127                         stfd    f1,     -8(r5)
 128
 129                         subi    r5,     r5,     16
 130
 131                         bgt+    cr0,    .L_vscr_down_loop
 132
 133
 134                         lfd             f0,(FM_SIZE+0)(r1)                                      /* Load back one register */
 135                         lfd             f1,(FM_SIZE+8)(r1)                                      /* and the second */
 136                         lwz             r1,0(r1)                                                        /* Pop the stack */
 137
 138                         mtmsr   r0                                                                      /* Turn off FPU again */
 139                         isync                                                                           /* Wait for it */
 140                         blr                                                                                     /* Go away, don't bother me... */
 141