[POWERPC] Fix MMIO ops to provide expected barrier behaviour
[pandora-kernel.git] / arch / powerpc / kernel / misc.S
1 /*
2  * This file contains miscellaneous low-level functions.
3  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4  *
5  * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
6  * and Paul Mackerras.
7  *
8  * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
9  * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
10  *
11  * This program is free software; you can redistribute it and/or
12  * modify it under the terms of the GNU General Public License
13  * as published by the Free Software Foundation; either version
14  * 2 of the License, or (at your option) any later version.
15  */
16 #include <asm/ppc_asm.h>
17
18         .text
19
20 /*
21  * Returns (address we are running at) - (address we were linked at)
22  * for use before the text and data are mapped to KERNELBASE.
23  */
24
25 _GLOBAL(reloc_offset)
26         mflr    r0
27         bl      1f
28 1:      mflr    r3
29         LOAD_REG_IMMEDIATE(r4,1b)
30         subf    r3,r4,r3
31         mtlr    r0
32         blr
33
34 /*
35  * add_reloc_offset(x) returns x + reloc_offset().
36  */
37 _GLOBAL(add_reloc_offset)
38         mflr    r0
39         bl      1f
40 1:      mflr    r5
41         LOAD_REG_IMMEDIATE(r4,1b)
42         subf    r5,r4,r5
43         add     r3,r3,r5
44         mtlr    r0
45         blr
46
47 /*
48  * I/O string operations
49  *
50  * insb(port, buf, len)
51  * outsb(port, buf, len)
52  * insw(port, buf, len)
53  * outsw(port, buf, len)
54  * insl(port, buf, len)
55  * outsl(port, buf, len)
56  * insw_ns(port, buf, len)
57  * outsw_ns(port, buf, len)
58  * insl_ns(port, buf, len)
59  * outsl_ns(port, buf, len)
60  *
61  * The *_ns versions don't do byte-swapping.
62  */
63 _GLOBAL(_insb)
64         sync
65         cmpwi   0,r5,0
66         mtctr   r5
67         subi    r4,r4,1
68         blelr-
69 00:     lbz     r5,0(r3)
70         eieio
71         stbu    r5,1(r4)
72         bdnz    00b
73         twi     0,r5,0
74         isync
75         blr
76
77 _GLOBAL(_outsb)
78         cmpwi   0,r5,0
79         mtctr   r5
80         subi    r4,r4,1
81         blelr-
82         sync
83 00:     lbzu    r5,1(r4)
84         stb     r5,0(r3)
85         bdnz    00b
86         sync
87         blr
88
89 _GLOBAL(_insw)
90         sync
91         cmpwi   0,r5,0
92         mtctr   r5
93         subi    r4,r4,2
94         blelr-
95 00:     lhbrx   r5,0,r3
96         eieio
97         sthu    r5,2(r4)
98         bdnz    00b
99         twi     0,r5,0
100         isync
101         blr
102
103 _GLOBAL(_outsw)
104         cmpwi   0,r5,0
105         mtctr   r5
106         subi    r4,r4,2
107         blelr-
108         sync
109 00:     lhzu    r5,2(r4)
110         sthbrx  r5,0,r3
111         bdnz    00b
112         sync
113         blr
114
115 _GLOBAL(_insl)
116         sync
117         cmpwi   0,r5,0
118         mtctr   r5
119         subi    r4,r4,4
120         blelr-
121 00:     lwbrx   r5,0,r3
122         eieio
123         stwu    r5,4(r4)
124         bdnz    00b
125         twi     0,r5,0
126         isync
127         blr
128
129 _GLOBAL(_outsl)
130         cmpwi   0,r5,0
131         mtctr   r5
132         subi    r4,r4,4
133         blelr-
134         sync
135 00:     lwzu    r5,4(r4)
136         stwbrx  r5,0,r3
137         bdnz    00b
138         sync
139         blr
140
141 #ifdef CONFIG_PPC32
142 _GLOBAL(__ide_mm_insw)
143 #endif
144 _GLOBAL(_insw_ns)
145         sync
146         cmpwi   0,r5,0
147         mtctr   r5
148         subi    r4,r4,2
149         blelr-
150 00:     lhz     r5,0(r3)
151         eieio
152         sthu    r5,2(r4)
153         bdnz    00b
154         twi     0,r5,0
155         isync
156         blr
157
158 #ifdef CONFIG_PPC32
159 _GLOBAL(__ide_mm_outsw)
160 #endif
161 _GLOBAL(_outsw_ns)
162         cmpwi   0,r5,0
163         mtctr   r5
164         subi    r4,r4,2
165         blelr-
166         sync
167 00:     lhzu    r5,2(r4)
168         sth     r5,0(r3)
169         bdnz    00b
170         sync
171         blr
172
173 #ifdef CONFIG_PPC32
174 _GLOBAL(__ide_mm_insl)
175 #endif
176 _GLOBAL(_insl_ns)
177         sync
178         cmpwi   0,r5,0
179         mtctr   r5
180         subi    r4,r4,4
181         blelr-
182 00:     lwz     r5,0(r3)
183         eieio
184         stwu    r5,4(r4)
185         bdnz    00b
186         twi     0,r5,0
187         isync
188         blr
189
190 #ifdef CONFIG_PPC32
191 _GLOBAL(__ide_mm_outsl)
192 #endif
193 _GLOBAL(_outsl_ns)
194         cmpwi   0,r5,0
195         mtctr   r5
196         subi    r4,r4,4
197         blelr-
198         sync
199 00:     lwzu    r5,4(r4)
200         stw     r5,0(r3)
201         bdnz    00b
202         sync
203         blr
204