/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * @OSF_FREE_COPYRIGHT@ * */ /* Routines to perform high-speed scrolling, assuming that the memory is * non-cached, and that the amount of memory to be scrolled is a multiple * of (at least) 16. */ #include <ppc/asm.h> #include <ppc/proc_reg.h> /* * void video_scroll_up(unsigned long start, * unsigned long end, * unsigned long dest) */ ENTRY(video_scroll_up, TAG_NO_FRAME_USED) mfmsr r0 /* Get the MSR */ mflr r6 /* Get the LR */ ori r7,r0,1<<(31-MSR_FP_BIT) /* Turn on floating point */ stwu r1,-(FM_SIZE+16)(r1) /* Get space for a couple of registers on stack */ rlwinm r7,r7,0,MSR_EE_BIT+1,MSR_EE_BIT-1 /* Turn off interrupts */ stw r6,(FM_SIZE+16+FM_LR_SAVE)(r1) /* Save the return */ mtmsr r7 /* Turn on FPU */ isync /* Wait for it */ vsufpuon1: stfd f0,(FM_SIZE+0)(r1) /* Save one register */ stfd f1,(FM_SIZE+8)(r1) /* and the second */ stw r0,(FM_SIZE+FM_LR_SAVE)(r1) /* Save return */ /* ok, now we can use the FPU registers to do some fast copying */ .L_vscr_up_loop: lfd f0, 0(r3) lfd f1, 8(r3) addi r3, r3, 16 stfd f0, 0(r5) cmpl cr0, r3, r4 stfd f1, 8(r5) addi r5, r5, 16 blt+ cr0, .L_vscr_up_loop lfd f0,(FM_SIZE+0)(r1) /* Load back one register */ lfd f1,(FM_SIZE+8)(r1) /* and the second */ lwz r1,0(r1) /* Pop the stack */ mtmsr r0 /* Turn off FPU again */ isync /* Wait for it */ blr /* Go away, don't bother me... */ /* * void video_scroll_down(unsigned long start, HIGH address to scroll from * unsigned long end, LOW address * unsigned long dest) HIGH address */ ENTRY(video_scroll_down, TAG_NO_FRAME_USED) /* Save off the link register, we want to call fpu_save. */ mfmsr r0 /* Get the MSR */ mflr r6 /* Get the LR */ ori r7,r0,1<<(31-MSR_FP_BIT) /* Turn on floating point */ stwu r1,-(FM_SIZE+16)(r1) /* Get space for a couple of registers on stack */ rlwinm r7,r7,0,MSR_EE_BIT+1,MSR_EE_BIT-1 /* Turn off interrupts */ stw r6,(FM_SIZE+16+FM_LR_SAVE)(r1) /* Save the return */ mtmsr r7 /* Turn on FPU */ isync /* Wait for it */ vsdfpuon1: stfd f0,(FM_SIZE+0)(r1) /* Save one register */ stfd f1,(FM_SIZE+8)(r1) /* and the second */ stw r0,(FM_SIZE+FM_LR_SAVE)(r1) /* Save return */ /* ok, now we can use the FPU registers to do some fast copying */ .L_vscr_down_loop: lfd f0, -16(r3) lfd f1, -8(r3) subi r3, r3, 16 stfd f0, -16(r5) cmpl cr0, r3, r4 stfd f1, -8(r5) subi r5, r5, 16 bgt+ cr0, .L_vscr_down_loop lfd f0,(FM_SIZE+0)(r1) /* Load back one register */ lfd f1,(FM_SIZE+8)(r1) /* and the second */ lwz r1,0(r1) /* Pop the stack */ mtmsr r0 /* Turn off FPU again */ isync /* Wait for it */ blr /* Go away, don't bother me... */