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1.1 root 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 */
44: mflr r6 /* Get the LR */
45: ori r7,r0,1<<(31-MSR_FP_BIT) /* Turn on floating point */
46: stwu r1,-(FM_SIZE+16)(r1) /* Get space for a couple of registers on stack */
47: rlwinm r7,r7,0,MSR_EE_BIT+1,MSR_EE_BIT-1 /* Turn off interrupts */
48: stw r6,(FM_SIZE+16+FM_LR_SAVE)(r1) /* Save the return */
49:
50: mtmsr r7 /* Turn on FPU */
51: isync /* Wait for it */
52:
53: vsufpuon1: stfd f0,(FM_SIZE+0)(r1) /* Save one register */
54: stfd f1,(FM_SIZE+8)(r1) /* and the second */
55:
56: stw r0,(FM_SIZE+FM_LR_SAVE)(r1) /* Save return */
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 */
99: mflr r6 /* Get the LR */
100: ori r7,r0,1<<(31-MSR_FP_BIT) /* Turn on floating point */
101: stwu r1,-(FM_SIZE+16)(r1) /* Get space for a couple of registers on stack */
102: rlwinm r7,r7,0,MSR_EE_BIT+1,MSR_EE_BIT-1 /* Turn off interrupts */
103: stw r6,(FM_SIZE+16+FM_LR_SAVE)(r1) /* Save the return */
104:
105: mtmsr r7 /* Turn on FPU */
106: isync /* Wait for it */
107:
108: vsdfpuon1: stfd f0,(FM_SIZE+0)(r1) /* Save one register */
109: stfd f1,(FM_SIZE+8)(r1) /* and the second */
110:
111: stw r0,(FM_SIZE+FM_LR_SAVE)(r1) /* Save return */
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:
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