projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c79356b A |
1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 6 | * The contents of this file constitute Original Code as defined in and | |
| 7 | * are subject to the Apple Public Source License Version 1.1 (the | |
| 8 | * "License"). You may not use this file except in compliance with the | |
| 9 | * License. Please obtain a copy of the License at | |
| 10 | * http://www.apple.com/publicsource and read it before using this file. | |
| 11 | * | |
| 12 | * This Original Code and all software distributed under the License are | |
| 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the | |
| 17 | * License for the specific language governing rights and limitations | |
| 18 | * under the License. | |
| 19 | * | |
| 20 | * @APPLE_LICENSE_HEADER_END@ | |
| 21 | */ | |
| 22 | /* | |
| 23 | * @OSF_FREE_COPYRIGHT@ | |
| 24 | * | |
| 25 | */ | |
| 26 | ||
| 27 | /* Routines to perform high-speed scrolling, assuming that the memory is | |
| 28 | * non-cached, and that the amount of memory to be scrolled is a multiple | |
| 29 | * of (at least) 16. | |
| 30 | */ | |
| 31 | ||
| 32 | #include <ppc/asm.h> | |
| 33 | #include <ppc/proc_reg.h> | |
| 34 | ||
| 35 | /* | |
| 36 | * void video_scroll_up(unsigned long start, | |
| 37 | * unsigned long end, | |
| 38 | * unsigned long dest) | |
| 39 | */ | |
| 40 | ||
| 41 | ENTRY(video_scroll_up, TAG_NO_FRAME_USED) | |
| 42 | ||
| 43 | mfmsr r0 /* Get the MSR */ | |
| 9bccf70c A |
44 | rlwinm r0,r0,0,MSR_FP_BIT+1,MSR_FP_BIT-1 ; Force floating point off |
| 45 | rlwinm r0,r0,0,MSR_VEC_BIT+1,MSR_VEC_BIT-1 ; Force vectors off | |
| 1c79356b A |
46 | mflr r6 /* Get the LR */ |
| 47 | ori r7,r0,1<<(31-MSR_FP_BIT) /* Turn on floating point */ | |
| 48 | stwu r1,-(FM_SIZE+16)(r1) /* Get space for a couple of registers on stack */ | |
| 49 | rlwinm r7,r7,0,MSR_EE_BIT+1,MSR_EE_BIT-1 /* Turn off interrupts */ | |
| 50 | stw r6,(FM_SIZE+16+FM_LR_SAVE)(r1) /* Save the return */ | |
| 51 | ||
| 52 | mtmsr r7 /* Turn on FPU */ | |
| 53 | isync /* Wait for it */ | |
| 54 | ||
| 55 | vsufpuon1: stfd f0,(FM_SIZE+0)(r1) /* Save one register */ | |
| 56 | stfd f1,(FM_SIZE+8)(r1) /* and the second */ | |
| 1c79356b A |
57 | |
| 58 | /* ok, now we can use the FPU registers to do some fast copying | |
| 59 | */ | |
| 60 | ||
| 61 | .L_vscr_up_loop: | |
| 62 | lfd f0, 0(r3) | |
| 63 | lfd f1, 8(r3) | |
| 64 | ||
| 65 | addi r3, r3, 16 | |
| 66 | ||
| 67 | stfd f0, 0(r5) | |
| 68 | ||
| 69 | cmpl cr0, r3, r4 | |
| 70 | ||
| 71 | stfd f1, 8(r5) | |
| 72 | ||
| 73 | addi r5, r5, 16 | |
| 74 | ||
| 75 | blt+ cr0, .L_vscr_up_loop | |
| 76 | ||
| 77 | lfd f0,(FM_SIZE+0)(r1) /* Load back one register */ | |
| 78 | lfd f1,(FM_SIZE+8)(r1) /* and the second */ | |
| 79 | lwz r1,0(r1) /* Pop the stack */ | |
| 80 | ||
| 81 | mtmsr r0 /* Turn off FPU again */ | |
| 82 | isync /* Wait for it */ | |
| 83 | blr /* Go away, don't bother me... */ | |
| 84 | ||
| 85 | ||
| 86 | /* | |
| 87 | * void video_scroll_down(unsigned long start, HIGH address to scroll from | |
| 88 | * unsigned long end, LOW address | |
| 89 | * unsigned long dest) HIGH address | |
| 90 | */ | |
| 91 | ||
| 92 | ENTRY(video_scroll_down, TAG_NO_FRAME_USED) | |
| 93 | ||
| 94 | /* Save off the link register, we want to call fpu_save. | |
| 95 | */ | |
| 96 | ||
| 97 | ||
| 98 | mfmsr r0 /* Get the MSR */ | |
| 9bccf70c A |
99 | rlwinm r0,r0,0,MSR_FP_BIT+1,MSR_FP_BIT-1 ; Force floating point off |
| 100 | rlwinm r0,r0,0,MSR_VEC_BIT+1,MSR_VEC_BIT-1 ; Force vectors off | |
| 1c79356b A |
101 | mflr r6 /* Get the LR */ |
| 102 | ori r7,r0,1<<(31-MSR_FP_BIT) /* Turn on floating point */ | |
| 103 | stwu r1,-(FM_SIZE+16)(r1) /* Get space for a couple of registers on stack */ | |
| 104 | rlwinm r7,r7,0,MSR_EE_BIT+1,MSR_EE_BIT-1 /* Turn off interrupts */ | |
| 105 | stw r6,(FM_SIZE+16+FM_LR_SAVE)(r1) /* Save the return */ | |
| 106 | ||
| 107 | mtmsr r7 /* Turn on FPU */ | |
| 108 | isync /* Wait for it */ | |
| 109 | ||
| 110 | vsdfpuon1: stfd f0,(FM_SIZE+0)(r1) /* Save one register */ | |
| 111 | stfd f1,(FM_SIZE+8)(r1) /* and the second */ | |
| 1c79356b A |
112 | |
| 113 | /* ok, now we can use the FPU registers to do some fast copying */ | |
| 114 | ||
| 115 | .L_vscr_down_loop: | |
| 116 | lfd f0, -16(r3) | |
| 117 | lfd f1, -8(r3) | |
| 118 | ||
| 119 | subi r3, r3, 16 | |
| 120 | ||
| 121 | stfd f0, -16(r5) | |
| 122 | ||
| 123 | cmpl cr0, r3, r4 | |
| 124 | ||
| 125 | stfd f1, -8(r5) | |
| 126 | ||
| 127 | subi r5, r5, 16 | |
| 128 | ||
| 129 | bgt+ cr0, .L_vscr_down_loop | |
| 130 | ||
| 131 | ||
| 132 | lfd f0,(FM_SIZE+0)(r1) /* Load back one register */ | |
| 133 | lfd f1,(FM_SIZE+8)(r1) /* and the second */ | |
| 134 | lwz r1,0(r1) /* Pop the stack */ | |
| 135 | ||
| 136 | mtmsr r0 /* Turn off FPU again */ | |
| 137 | isync /* Wait for it */ | |
| 138 | blr /* Go away, don't bother me... */ | |
| 139 |