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 47ENTRY(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 59vsufpuon1: 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 96ENTRY(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 112vsdfpuon1: 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... */ 141 142