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1da177e4 LT |
1 | /* -*- mode: asm -*- |
2 | * Due to problems while transferring data I've put these routines as assembly | |
3 | * code. | |
4 | * Since I'm no PPC assembler guru, the code is just the assembler version of | |
5 | ||
6 | int oktag_to_io(long *paddr,long *addr,long len) | |
7 | { | |
8 | long *addr2 = addr; | |
9 | for(len=(len+sizeof(long)-1)/sizeof(long);len--;) | |
10 | *paddr = *addr2++; | |
11 | return addr2 - addr; | |
12 | } | |
13 | ||
14 | int oktag_from_io(long *addr,long *paddr,long len) | |
15 | { | |
16 | long *addr2 = addr; | |
17 | for(len=(len+sizeof(long)-1)/sizeof(long);len--;) | |
18 | *addr2++ = *paddr; | |
19 | return addr2 - addr; | |
20 | } | |
21 | ||
22 | * assembled using gcc -O2 -S, with two exception catch points where data | |
23 | * is moved to/from the IO register. | |
24 | */ | |
25 | ||
26 | #include <linux/config.h> | |
27 | ||
28 | #ifdef CONFIG_APUS | |
29 | ||
30 | .file "oktagon_io.c" | |
31 | ||
32 | gcc2_compiled.: | |
33 | /* | |
34 | .section ".text" | |
35 | */ | |
36 | .align 2 | |
37 | .globl oktag_to_io | |
38 | .type oktag_to_io,@function | |
39 | oktag_to_io: | |
40 | addi 5,5,3 | |
41 | srwi 5,5,2 | |
42 | cmpwi 1,5,0 | |
43 | mr 9,3 | |
44 | mr 3,4 | |
45 | addi 5,5,-1 | |
46 | bc 12,6,.L3 | |
47 | .L5: | |
48 | cmpwi 1,5,0 | |
49 | lwz 0,0(3) | |
50 | addi 3,3,4 | |
51 | addi 5,5,-1 | |
52 | exp1: stw 0,0(9) | |
53 | bc 4,6,.L5 | |
54 | .L3: | |
55 | ret1: subf 3,4,3 | |
56 | srawi 3,3,2 | |
57 | blr | |
58 | .Lfe1: | |
59 | .size oktag_to_io,.Lfe1-oktag_to_io | |
60 | .align 2 | |
61 | .globl oktag_from_io | |
62 | .type oktag_from_io,@function | |
63 | oktag_from_io: | |
64 | addi 5,5,3 | |
65 | srwi 5,5,2 | |
66 | cmpwi 1,5,0 | |
67 | mr 9,3 | |
68 | addi 5,5,-1 | |
69 | bc 12,6,.L9 | |
70 | .L11: | |
71 | cmpwi 1,5,0 | |
72 | exp2: lwz 0,0(4) | |
73 | addi 5,5,-1 | |
74 | stw 0,0(3) | |
75 | addi 3,3,4 | |
76 | bc 4,6,.L11 | |
77 | .L9: | |
78 | ret2: subf 3,9,3 | |
79 | srawi 3,3,2 | |
80 | blr | |
81 | .Lfe2: | |
82 | .size oktag_from_io,.Lfe2-oktag_from_io | |
83 | .ident "GCC: (GNU) egcs-2.90.29 980515 (egcs-1.0.3 release)" | |
84 | ||
85 | /* | |
86 | * Exception table. | |
87 | * Second longword shows where to jump when an exception at the addr the first | |
88 | * longword is pointing to is caught. | |
89 | */ | |
90 | ||
91 | .section __ex_table,"a" | |
92 | .align 2 | |
93 | oktagon_except: | |
94 | .long exp1,ret1 | |
95 | .long exp2,ret2 | |
96 | ||
97 | #else | |
98 | ||
99 | /* | |
100 | The code which follows is for 680x0 based assembler and is meant for | |
101 | Linux/m68k. It was created by cross compiling the code using the | |
102 | instructions given above. I then added the four labels used in the | |
103 | exception handler table at the bottom of this file. | |
104 | - Kevin <kcozens@interlog.com> | |
105 | */ | |
106 | ||
107 | #ifdef CONFIG_AMIGA | |
108 | ||
109 | .file "oktagon_io.c" | |
110 | .version "01.01" | |
111 | gcc2_compiled.: | |
112 | .text | |
113 | .align 2 | |
114 | .globl oktag_to_io | |
115 | .type oktag_to_io,@function | |
116 | oktag_to_io: | |
117 | link.w %a6,#0 | |
118 | move.l %d2,-(%sp) | |
119 | move.l 8(%a6),%a1 | |
120 | move.l 12(%a6),%d1 | |
121 | move.l %d1,%a0 | |
122 | move.l 16(%a6),%d0 | |
123 | addq.l #3,%d0 | |
124 | lsr.l #2,%d0 | |
125 | subq.l #1,%d0 | |
126 | moveq.l #-1,%d2 | |
127 | cmp.l %d0,%d2 | |
128 | jbeq .L3 | |
129 | .L5: | |
130 | exp1: | |
131 | move.l (%a0)+,(%a1) | |
132 | dbra %d0,.L5 | |
133 | clr.w %d0 | |
134 | subq.l #1,%d0 | |
135 | jbcc .L5 | |
136 | .L3: | |
137 | ret1: | |
138 | move.l %a0,%d0 | |
139 | sub.l %d1,%d0 | |
140 | asr.l #2,%d0 | |
141 | move.l -4(%a6),%d2 | |
142 | unlk %a6 | |
143 | rts | |
144 | ||
145 | .Lfe1: | |
146 | .size oktag_to_io,.Lfe1-oktag_to_io | |
147 | .align 2 | |
148 | .globl oktag_from_io | |
149 | .type oktag_from_io,@function | |
150 | oktag_from_io: | |
151 | link.w %a6,#0 | |
152 | move.l %d2,-(%sp) | |
153 | move.l 8(%a6),%d1 | |
154 | move.l 12(%a6),%a1 | |
155 | move.l %d1,%a0 | |
156 | move.l 16(%a6),%d0 | |
157 | addq.l #3,%d0 | |
158 | lsr.l #2,%d0 | |
159 | subq.l #1,%d0 | |
160 | moveq.l #-1,%d2 | |
161 | cmp.l %d0,%d2 | |
162 | jbeq .L9 | |
163 | .L11: | |
164 | exp2: | |
165 | move.l (%a1),(%a0)+ | |
166 | dbra %d0,.L11 | |
167 | clr.w %d0 | |
168 | subq.l #1,%d0 | |
169 | jbcc .L11 | |
170 | .L9: | |
171 | ret2: | |
172 | move.l %a0,%d0 | |
173 | sub.l %d1,%d0 | |
174 | asr.l #2,%d0 | |
175 | move.l -4(%a6),%d2 | |
176 | unlk %a6 | |
177 | rts | |
178 | .Lfe2: | |
179 | .size oktag_from_io,.Lfe2-oktag_from_io | |
180 | .ident "GCC: (GNU) 2.7.2.1" | |
181 | ||
182 | /* | |
183 | * Exception table. | |
184 | * Second longword shows where to jump when an exception at the addr the first | |
185 | * longword is pointing to is caught. | |
186 | */ | |
187 | ||
188 | .section __ex_table,"a" | |
189 | .align 2 | |
190 | oktagon_except: | |
191 | .long exp1,ret1 | |
192 | .long exp2,ret2 | |
193 | ||
194 | #endif | |
195 | #endif |