Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Optimized memory copy routines. | |
3 | * | |
4 | * Copyright (C) 2004 Randolph Chung <tausq@debian.org> | |
5b879d78 | 5 | * Copyright (C) 2013 Helge Deller <deller@gmx.de> |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2, or (at your option) | |
10 | * any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | * | |
21 | * Portions derived from the GNU C Library | |
22 | * Copyright (C) 1991, 1997, 2003 Free Software Foundation, Inc. | |
23 | * | |
24 | * Several strategies are tried to try to get the best performance for various | |
25 | * conditions. In the optimal case, we copy 64-bytes in an unrolled loop using | |
26 | * fp regs. This is followed by loops that copy 32- or 16-bytes at a time using | |
27 | * general registers. Unaligned copies are handled either by aligning the | |
28 | * destination and then using shift-and-write method, or in a few cases by | |
29 | * falling back to a byte-at-a-time copy. | |
30 | * | |
31 | * I chose to implement this in C because it is easier to maintain and debug, | |
32 | * and in my experiments it appears that the C code generated by gcc (3.3/3.4 | |
33 | * at the time of writing) is fairly optimal. Unfortunately some of the | |
34 | * semantics of the copy routine (exception handling) is difficult to express | |
35 | * in C, so we have to play some tricks to get it to work. | |
36 | * | |
37 | * All the loads and stores are done via explicit asm() code in order to use | |
38 | * the right space registers. | |
39 | * | |
40 | * Testing with various alignments and buffer sizes shows that this code is | |
41 | * often >10x faster than a simple byte-at-a-time copy, even for strangely | |
42 | * aligned operands. It is interesting to note that the glibc version | |
43 | * of memcpy (written in C) is actually quite fast already. This routine is | |
44 | * able to beat it by 30-40% for aligned copies because of the loop unrolling, | |
45 | * but in some cases the glibc version is still slightly faster. This lends | |
46 | * more credibility that gcc can generate very good code as long as we are | |
47 | * careful. | |
48 | * | |
49 | * TODO: | |
50 | * - cache prefetching needs more experimentation to get optimal settings | |
51 | * - try not to use the post-increment address modifiers; they create additional | |
52 | * interlocks | |
53 | * - replace byte-copy loops with stybs sequences | |
54 | */ | |
55 | ||
56 | #ifdef __KERNEL__ | |
1da177e4 LT |
57 | #include <linux/module.h> |
58 | #include <linux/compiler.h> | |
db080f9c | 59 | #include <linux/uaccess.h> |
1da177e4 LT |
60 | #define s_space "%%sr1" |
61 | #define d_space "%%sr2" | |
62 | #else | |
63 | #include "memcpy.h" | |
64 | #define s_space "%%sr0" | |
65 | #define d_space "%%sr0" | |
66 | #define pa_memcpy new2_copy | |
67 | #endif | |
68 | ||
69 | DECLARE_PER_CPU(struct exception_data, exception_data); | |
70 | ||
71 | #define preserve_branch(label) do { \ | |
d8d0524a | 72 | volatile int dummy = 0; \ |
1da177e4 LT |
73 | /* The following branch is never taken, it's just here to */ \ |
74 | /* prevent gcc from optimizing away our exception code. */ \ | |
75 | if (unlikely(dummy != dummy)) \ | |
76 | goto label; \ | |
77 | } while (0) | |
78 | ||
79 | #define get_user_space() (segment_eq(get_fs(), KERNEL_DS) ? 0 : mfsp(3)) | |
80 | #define get_kernel_space() (0) | |
81 | ||
82 | #define MERGE(w0, sh_1, w1, sh_2) ({ \ | |
83 | unsigned int _r; \ | |
84 | asm volatile ( \ | |
85 | "mtsar %3\n" \ | |
86 | "shrpw %1, %2, %%sar, %0\n" \ | |
87 | : "=r"(_r) \ | |
88 | : "r"(w0), "r"(w1), "r"(sh_2) \ | |
89 | ); \ | |
90 | _r; \ | |
91 | }) | |
92 | #define THRESHOLD 16 | |
93 | ||
94 | #ifdef DEBUG_MEMCPY | |
91bae23c | 95 | #define DPRINTF(fmt, args...) do { printk(KERN_DEBUG "%s:%d:%s ", __FILE__, __LINE__, __func__ ); printk(KERN_DEBUG fmt, ##args ); } while (0) |
1da177e4 LT |
96 | #else |
97 | #define DPRINTF(fmt, args...) | |
98 | #endif | |
99 | ||
1da177e4 LT |
100 | #define def_load_ai_insn(_insn,_sz,_tt,_s,_a,_t,_e) \ |
101 | __asm__ __volatile__ ( \ | |
0b3d643f HD |
102 | "1:\t" #_insn ",ma " #_sz "(" _s ",%1), %0\n\t" \ |
103 | ASM_EXCEPTIONTABLE_ENTRY(1b,_e) \ | |
1da177e4 LT |
104 | : _tt(_t), "+r"(_a) \ |
105 | : \ | |
106 | : "r8") | |
107 | ||
108 | #define def_store_ai_insn(_insn,_sz,_tt,_s,_a,_t,_e) \ | |
109 | __asm__ __volatile__ ( \ | |
0b3d643f HD |
110 | "1:\t" #_insn ",ma %1, " #_sz "(" _s ",%0)\n\t" \ |
111 | ASM_EXCEPTIONTABLE_ENTRY(1b,_e) \ | |
1da177e4 LT |
112 | : "+r"(_a) \ |
113 | : _tt(_t) \ | |
114 | : "r8") | |
115 | ||
116 | #define ldbma(_s, _a, _t, _e) def_load_ai_insn(ldbs,1,"=r",_s,_a,_t,_e) | |
117 | #define stbma(_s, _t, _a, _e) def_store_ai_insn(stbs,1,"r",_s,_a,_t,_e) | |
118 | #define ldwma(_s, _a, _t, _e) def_load_ai_insn(ldw,4,"=r",_s,_a,_t,_e) | |
119 | #define stwma(_s, _t, _a, _e) def_store_ai_insn(stw,4,"r",_s,_a,_t,_e) | |
120 | #define flddma(_s, _a, _t, _e) def_load_ai_insn(fldd,8,"=f",_s,_a,_t,_e) | |
121 | #define fstdma(_s, _t, _a, _e) def_store_ai_insn(fstd,8,"f",_s,_a,_t,_e) | |
122 | ||
123 | #define def_load_insn(_insn,_tt,_s,_o,_a,_t,_e) \ | |
124 | __asm__ __volatile__ ( \ | |
0b3d643f HD |
125 | "1:\t" #_insn " " #_o "(" _s ",%1), %0\n\t" \ |
126 | ASM_EXCEPTIONTABLE_ENTRY(1b,_e) \ | |
1da177e4 LT |
127 | : _tt(_t) \ |
128 | : "r"(_a) \ | |
129 | : "r8") | |
130 | ||
131 | #define def_store_insn(_insn,_tt,_s,_t,_o,_a,_e) \ | |
132 | __asm__ __volatile__ ( \ | |
0b3d643f HD |
133 | "1:\t" #_insn " %0, " #_o "(" _s ",%1)\n\t" \ |
134 | ASM_EXCEPTIONTABLE_ENTRY(1b,_e) \ | |
1da177e4 LT |
135 | : \ |
136 | : _tt(_t), "r"(_a) \ | |
137 | : "r8") | |
138 | ||
139 | #define ldw(_s,_o,_a,_t,_e) def_load_insn(ldw,"=r",_s,_o,_a,_t,_e) | |
140 | #define stw(_s,_t,_o,_a,_e) def_store_insn(stw,"r",_s,_t,_o,_a,_e) | |
141 | ||
142 | #ifdef CONFIG_PREFETCH | |
f13cec84 | 143 | static inline void prefetch_src(const void *addr) |
1da177e4 LT |
144 | { |
145 | __asm__("ldw 0(" s_space ",%0), %%r0" : : "r" (addr)); | |
146 | } | |
147 | ||
f13cec84 | 148 | static inline void prefetch_dst(const void *addr) |
1da177e4 LT |
149 | { |
150 | __asm__("ldd 0(" d_space ",%0), %%r0" : : "r" (addr)); | |
151 | } | |
152 | #else | |
0b3d643f HD |
153 | #define prefetch_src(addr) do { } while(0) |
154 | #define prefetch_dst(addr) do { } while(0) | |
1da177e4 LT |
155 | #endif |
156 | ||
5b879d78 HD |
157 | #define PA_MEMCPY_OK 0 |
158 | #define PA_MEMCPY_LOAD_ERROR 1 | |
159 | #define PA_MEMCPY_STORE_ERROR 2 | |
160 | ||
1da177e4 LT |
161 | /* Copy from a not-aligned src to an aligned dst, using shifts. Handles 4 words |
162 | * per loop. This code is derived from glibc. | |
163 | */ | |
5b879d78 HD |
164 | static inline unsigned long copy_dstaligned(unsigned long dst, |
165 | unsigned long src, unsigned long len) | |
1da177e4 LT |
166 | { |
167 | /* gcc complains that a2 and a3 may be uninitialized, but actually | |
168 | * they cannot be. Initialize a2/a3 to shut gcc up. | |
169 | */ | |
170 | register unsigned int a0, a1, a2 = 0, a3 = 0; | |
171 | int sh_1, sh_2; | |
1da177e4 LT |
172 | |
173 | /* prefetch_src((const void *)src); */ | |
174 | ||
175 | /* Calculate how to shift a word read at the memory operation | |
176 | aligned srcp to make it aligned for copy. */ | |
177 | sh_1 = 8 * (src % sizeof(unsigned int)); | |
178 | sh_2 = 8 * sizeof(unsigned int) - sh_1; | |
179 | ||
180 | /* Make src aligned by rounding it down. */ | |
181 | src &= -sizeof(unsigned int); | |
182 | ||
183 | switch (len % 4) | |
184 | { | |
185 | case 2: | |
186 | /* a1 = ((unsigned int *) src)[0]; | |
187 | a2 = ((unsigned int *) src)[1]; */ | |
188 | ldw(s_space, 0, src, a1, cda_ldw_exc); | |
189 | ldw(s_space, 4, src, a2, cda_ldw_exc); | |
190 | src -= 1 * sizeof(unsigned int); | |
191 | dst -= 3 * sizeof(unsigned int); | |
192 | len += 2; | |
193 | goto do1; | |
194 | case 3: | |
195 | /* a0 = ((unsigned int *) src)[0]; | |
196 | a1 = ((unsigned int *) src)[1]; */ | |
197 | ldw(s_space, 0, src, a0, cda_ldw_exc); | |
198 | ldw(s_space, 4, src, a1, cda_ldw_exc); | |
199 | src -= 0 * sizeof(unsigned int); | |
200 | dst -= 2 * sizeof(unsigned int); | |
201 | len += 1; | |
202 | goto do2; | |
203 | case 0: | |
204 | if (len == 0) | |
5b879d78 | 205 | return PA_MEMCPY_OK; |
1da177e4 LT |
206 | /* a3 = ((unsigned int *) src)[0]; |
207 | a0 = ((unsigned int *) src)[1]; */ | |
208 | ldw(s_space, 0, src, a3, cda_ldw_exc); | |
209 | ldw(s_space, 4, src, a0, cda_ldw_exc); | |
210 | src -=-1 * sizeof(unsigned int); | |
211 | dst -= 1 * sizeof(unsigned int); | |
212 | len += 0; | |
213 | goto do3; | |
214 | case 1: | |
215 | /* a2 = ((unsigned int *) src)[0]; | |
216 | a3 = ((unsigned int *) src)[1]; */ | |
217 | ldw(s_space, 0, src, a2, cda_ldw_exc); | |
218 | ldw(s_space, 4, src, a3, cda_ldw_exc); | |
219 | src -=-2 * sizeof(unsigned int); | |
220 | dst -= 0 * sizeof(unsigned int); | |
221 | len -= 1; | |
222 | if (len == 0) | |
223 | goto do0; | |
224 | goto do4; /* No-op. */ | |
225 | } | |
226 | ||
227 | do | |
228 | { | |
229 | /* prefetch_src((const void *)(src + 4 * sizeof(unsigned int))); */ | |
230 | do4: | |
231 | /* a0 = ((unsigned int *) src)[0]; */ | |
232 | ldw(s_space, 0, src, a0, cda_ldw_exc); | |
233 | /* ((unsigned int *) dst)[0] = MERGE (a2, sh_1, a3, sh_2); */ | |
234 | stw(d_space, MERGE (a2, sh_1, a3, sh_2), 0, dst, cda_stw_exc); | |
235 | do3: | |
236 | /* a1 = ((unsigned int *) src)[1]; */ | |
237 | ldw(s_space, 4, src, a1, cda_ldw_exc); | |
238 | /* ((unsigned int *) dst)[1] = MERGE (a3, sh_1, a0, sh_2); */ | |
239 | stw(d_space, MERGE (a3, sh_1, a0, sh_2), 4, dst, cda_stw_exc); | |
240 | do2: | |
241 | /* a2 = ((unsigned int *) src)[2]; */ | |
242 | ldw(s_space, 8, src, a2, cda_ldw_exc); | |
243 | /* ((unsigned int *) dst)[2] = MERGE (a0, sh_1, a1, sh_2); */ | |
244 | stw(d_space, MERGE (a0, sh_1, a1, sh_2), 8, dst, cda_stw_exc); | |
245 | do1: | |
246 | /* a3 = ((unsigned int *) src)[3]; */ | |
247 | ldw(s_space, 12, src, a3, cda_ldw_exc); | |
248 | /* ((unsigned int *) dst)[3] = MERGE (a1, sh_1, a2, sh_2); */ | |
249 | stw(d_space, MERGE (a1, sh_1, a2, sh_2), 12, dst, cda_stw_exc); | |
250 | ||
251 | src += 4 * sizeof(unsigned int); | |
252 | dst += 4 * sizeof(unsigned int); | |
253 | len -= 4; | |
254 | } | |
255 | while (len != 0); | |
256 | ||
257 | do0: | |
258 | /* ((unsigned int *) dst)[0] = MERGE (a2, sh_1, a3, sh_2); */ | |
259 | stw(d_space, MERGE (a2, sh_1, a3, sh_2), 0, dst, cda_stw_exc); | |
260 | ||
261 | preserve_branch(handle_load_error); | |
262 | preserve_branch(handle_store_error); | |
263 | ||
5b879d78 | 264 | return PA_MEMCPY_OK; |
1da177e4 LT |
265 | |
266 | handle_load_error: | |
267 | __asm__ __volatile__ ("cda_ldw_exc:\n"); | |
5b879d78 | 268 | return PA_MEMCPY_LOAD_ERROR; |
1da177e4 LT |
269 | |
270 | handle_store_error: | |
271 | __asm__ __volatile__ ("cda_stw_exc:\n"); | |
5b879d78 | 272 | return PA_MEMCPY_STORE_ERROR; |
1da177e4 LT |
273 | } |
274 | ||
275 | ||
5b879d78 HD |
276 | /* Returns PA_MEMCPY_OK, PA_MEMCPY_LOAD_ERROR or PA_MEMCPY_STORE_ERROR. |
277 | * In case of an access fault the faulty address can be read from the per_cpu | |
278 | * exception data struct. */ | |
279 | static unsigned long pa_memcpy_internal(void *dstp, const void *srcp, | |
280 | unsigned long len) | |
1da177e4 LT |
281 | { |
282 | register unsigned long src, dst, t1, t2, t3; | |
283 | register unsigned char *pcs, *pcd; | |
284 | register unsigned int *pws, *pwd; | |
285 | register double *pds, *pdd; | |
5b879d78 | 286 | unsigned long ret; |
1da177e4 LT |
287 | |
288 | src = (unsigned long)srcp; | |
289 | dst = (unsigned long)dstp; | |
290 | pcs = (unsigned char *)srcp; | |
291 | pcd = (unsigned char *)dstp; | |
292 | ||
1da177e4 LT |
293 | /* prefetch_src((const void *)srcp); */ |
294 | ||
295 | if (len < THRESHOLD) | |
296 | goto byte_copy; | |
297 | ||
298 | /* Check alignment */ | |
299 | t1 = (src ^ dst); | |
300 | if (unlikely(t1 & (sizeof(double)-1))) | |
301 | goto unaligned_copy; | |
302 | ||
303 | /* src and dst have same alignment. */ | |
304 | ||
305 | /* Copy bytes till we are double-aligned. */ | |
306 | t2 = src & (sizeof(double) - 1); | |
307 | if (unlikely(t2 != 0)) { | |
308 | t2 = sizeof(double) - t2; | |
309 | while (t2 && len) { | |
310 | /* *pcd++ = *pcs++; */ | |
311 | ldbma(s_space, pcs, t3, pmc_load_exc); | |
312 | len--; | |
313 | stbma(d_space, t3, pcd, pmc_store_exc); | |
314 | t2--; | |
315 | } | |
316 | } | |
317 | ||
318 | pds = (double *)pcs; | |
319 | pdd = (double *)pcd; | |
320 | ||
fa681a18 | 321 | #if 0 |
1da177e4 LT |
322 | /* Copy 8 doubles at a time */ |
323 | while (len >= 8*sizeof(double)) { | |
324 | register double r1, r2, r3, r4, r5, r6, r7, r8; | |
325 | /* prefetch_src((char *)pds + L1_CACHE_BYTES); */ | |
326 | flddma(s_space, pds, r1, pmc_load_exc); | |
327 | flddma(s_space, pds, r2, pmc_load_exc); | |
328 | flddma(s_space, pds, r3, pmc_load_exc); | |
329 | flddma(s_space, pds, r4, pmc_load_exc); | |
330 | fstdma(d_space, r1, pdd, pmc_store_exc); | |
331 | fstdma(d_space, r2, pdd, pmc_store_exc); | |
332 | fstdma(d_space, r3, pdd, pmc_store_exc); | |
333 | fstdma(d_space, r4, pdd, pmc_store_exc); | |
334 | ||
335 | #if 0 | |
336 | if (L1_CACHE_BYTES <= 32) | |
337 | prefetch_src((char *)pds + L1_CACHE_BYTES); | |
338 | #endif | |
339 | flddma(s_space, pds, r5, pmc_load_exc); | |
340 | flddma(s_space, pds, r6, pmc_load_exc); | |
341 | flddma(s_space, pds, r7, pmc_load_exc); | |
342 | flddma(s_space, pds, r8, pmc_load_exc); | |
343 | fstdma(d_space, r5, pdd, pmc_store_exc); | |
344 | fstdma(d_space, r6, pdd, pmc_store_exc); | |
345 | fstdma(d_space, r7, pdd, pmc_store_exc); | |
346 | fstdma(d_space, r8, pdd, pmc_store_exc); | |
347 | len -= 8*sizeof(double); | |
348 | } | |
fa681a18 | 349 | #endif |
1da177e4 LT |
350 | |
351 | pws = (unsigned int *)pds; | |
352 | pwd = (unsigned int *)pdd; | |
353 | ||
354 | word_copy: | |
355 | while (len >= 8*sizeof(unsigned int)) { | |
356 | register unsigned int r1,r2,r3,r4,r5,r6,r7,r8; | |
357 | /* prefetch_src((char *)pws + L1_CACHE_BYTES); */ | |
358 | ldwma(s_space, pws, r1, pmc_load_exc); | |
359 | ldwma(s_space, pws, r2, pmc_load_exc); | |
360 | ldwma(s_space, pws, r3, pmc_load_exc); | |
361 | ldwma(s_space, pws, r4, pmc_load_exc); | |
362 | stwma(d_space, r1, pwd, pmc_store_exc); | |
363 | stwma(d_space, r2, pwd, pmc_store_exc); | |
364 | stwma(d_space, r3, pwd, pmc_store_exc); | |
365 | stwma(d_space, r4, pwd, pmc_store_exc); | |
366 | ||
367 | ldwma(s_space, pws, r5, pmc_load_exc); | |
368 | ldwma(s_space, pws, r6, pmc_load_exc); | |
369 | ldwma(s_space, pws, r7, pmc_load_exc); | |
370 | ldwma(s_space, pws, r8, pmc_load_exc); | |
371 | stwma(d_space, r5, pwd, pmc_store_exc); | |
372 | stwma(d_space, r6, pwd, pmc_store_exc); | |
373 | stwma(d_space, r7, pwd, pmc_store_exc); | |
374 | stwma(d_space, r8, pwd, pmc_store_exc); | |
375 | len -= 8*sizeof(unsigned int); | |
376 | } | |
377 | ||
378 | while (len >= 4*sizeof(unsigned int)) { | |
379 | register unsigned int r1,r2,r3,r4; | |
380 | ldwma(s_space, pws, r1, pmc_load_exc); | |
381 | ldwma(s_space, pws, r2, pmc_load_exc); | |
382 | ldwma(s_space, pws, r3, pmc_load_exc); | |
383 | ldwma(s_space, pws, r4, pmc_load_exc); | |
384 | stwma(d_space, r1, pwd, pmc_store_exc); | |
385 | stwma(d_space, r2, pwd, pmc_store_exc); | |
386 | stwma(d_space, r3, pwd, pmc_store_exc); | |
387 | stwma(d_space, r4, pwd, pmc_store_exc); | |
388 | len -= 4*sizeof(unsigned int); | |
389 | } | |
390 | ||
391 | pcs = (unsigned char *)pws; | |
392 | pcd = (unsigned char *)pwd; | |
393 | ||
394 | byte_copy: | |
395 | while (len) { | |
396 | /* *pcd++ = *pcs++; */ | |
397 | ldbma(s_space, pcs, t3, pmc_load_exc); | |
398 | stbma(d_space, t3, pcd, pmc_store_exc); | |
399 | len--; | |
400 | } | |
401 | ||
5b879d78 | 402 | return PA_MEMCPY_OK; |
1da177e4 LT |
403 | |
404 | unaligned_copy: | |
405 | /* possibly we are aligned on a word, but not on a double... */ | |
87451d85 | 406 | if (likely((t1 & (sizeof(unsigned int)-1)) == 0)) { |
1da177e4 LT |
407 | t2 = src & (sizeof(unsigned int) - 1); |
408 | ||
409 | if (unlikely(t2 != 0)) { | |
410 | t2 = sizeof(unsigned int) - t2; | |
411 | while (t2) { | |
412 | /* *pcd++ = *pcs++; */ | |
413 | ldbma(s_space, pcs, t3, pmc_load_exc); | |
414 | stbma(d_space, t3, pcd, pmc_store_exc); | |
415 | len--; | |
416 | t2--; | |
417 | } | |
418 | } | |
419 | ||
420 | pws = (unsigned int *)pcs; | |
421 | pwd = (unsigned int *)pcd; | |
422 | goto word_copy; | |
423 | } | |
424 | ||
425 | /* Align the destination. */ | |
426 | if (unlikely((dst & (sizeof(unsigned int) - 1)) != 0)) { | |
427 | t2 = sizeof(unsigned int) - (dst & (sizeof(unsigned int) - 1)); | |
428 | while (t2) { | |
429 | /* *pcd++ = *pcs++; */ | |
430 | ldbma(s_space, pcs, t3, pmc_load_exc); | |
431 | stbma(d_space, t3, pcd, pmc_store_exc); | |
432 | len--; | |
433 | t2--; | |
434 | } | |
435 | dst = (unsigned long)pcd; | |
436 | src = (unsigned long)pcs; | |
437 | } | |
438 | ||
5b879d78 | 439 | ret = copy_dstaligned(dst, src, len / sizeof(unsigned int)); |
1da177e4 LT |
440 | if (ret) |
441 | return ret; | |
442 | ||
443 | pcs += (len & -sizeof(unsigned int)); | |
444 | pcd += (len & -sizeof(unsigned int)); | |
445 | len %= sizeof(unsigned int); | |
446 | ||
447 | preserve_branch(handle_load_error); | |
448 | preserve_branch(handle_store_error); | |
449 | ||
450 | goto byte_copy; | |
451 | ||
452 | handle_load_error: | |
453 | __asm__ __volatile__ ("pmc_load_exc:\n"); | |
5b879d78 | 454 | return PA_MEMCPY_LOAD_ERROR; |
1da177e4 LT |
455 | |
456 | handle_store_error: | |
457 | __asm__ __volatile__ ("pmc_store_exc:\n"); | |
5b879d78 HD |
458 | return PA_MEMCPY_STORE_ERROR; |
459 | } | |
460 | ||
461 | ||
462 | /* Returns 0 for success, otherwise, returns number of bytes not transferred. */ | |
463 | static unsigned long pa_memcpy(void *dstp, const void *srcp, unsigned long len) | |
464 | { | |
465 | unsigned long ret, fault_addr, reference; | |
466 | struct exception_data *d; | |
467 | ||
468 | ret = pa_memcpy_internal(dstp, srcp, len); | |
469 | if (likely(ret == PA_MEMCPY_OK)) | |
470 | return 0; | |
471 | ||
472 | /* if a load or store fault occured we can get the faulty addr */ | |
1da177e4 | 473 | d = &__get_cpu_var(exception_data); |
5b879d78 HD |
474 | fault_addr = d->fault_addr; |
475 | ||
476 | /* error in load or store? */ | |
477 | if (ret == PA_MEMCPY_LOAD_ERROR) | |
478 | reference = (unsigned long) srcp; | |
479 | else | |
480 | reference = (unsigned long) dstp; | |
481 | ||
482 | DPRINTF("pa_memcpy: fault type = %lu, len=%lu fault_addr=%lu ref=%lu\n", | |
483 | ret, len, fault_addr, reference); | |
484 | ||
485 | if (fault_addr >= reference) | |
486 | return len - (fault_addr - reference); | |
487 | else | |
488 | return len; | |
1da177e4 LT |
489 | } |
490 | ||
491 | #ifdef __KERNEL__ | |
492 | unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len) | |
493 | { | |
494 | mtsp(get_kernel_space(), 1); | |
495 | mtsp(get_user_space(), 2); | |
496 | return pa_memcpy((void __force *)dst, src, len); | |
497 | } | |
498 | ||
888c31fc HD |
499 | EXPORT_SYMBOL(__copy_from_user); |
500 | unsigned long __copy_from_user(void *dst, const void __user *src, unsigned long len) | |
1da177e4 LT |
501 | { |
502 | mtsp(get_user_space(), 1); | |
503 | mtsp(get_kernel_space(), 2); | |
504 | return pa_memcpy(dst, (void __force *)src, len); | |
505 | } | |
506 | ||
507 | unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len) | |
508 | { | |
509 | mtsp(get_user_space(), 1); | |
510 | mtsp(get_user_space(), 2); | |
511 | return pa_memcpy((void __force *)dst, (void __force *)src, len); | |
512 | } | |
513 | ||
514 | ||
515 | void * memcpy(void * dst,const void *src, size_t count) | |
516 | { | |
517 | mtsp(get_kernel_space(), 1); | |
518 | mtsp(get_kernel_space(), 2); | |
519 | pa_memcpy(dst, src, count); | |
520 | return dst; | |
521 | } | |
522 | ||
523 | EXPORT_SYMBOL(copy_to_user); | |
524 | EXPORT_SYMBOL(copy_from_user); | |
525 | EXPORT_SYMBOL(copy_in_user); | |
526 | EXPORT_SYMBOL(memcpy); | |
db080f9c HD |
527 | |
528 | long probe_kernel_read(void *dst, const void *src, size_t size) | |
529 | { | |
530 | unsigned long addr = (unsigned long)src; | |
531 | ||
532 | if (size < 0 || addr < PAGE_SIZE) | |
533 | return -EFAULT; | |
534 | ||
535 | /* check for I/O space F_EXTEND(0xfff00000) access as well? */ | |
536 | ||
537 | return __probe_kernel_read(dst, src, size); | |
538 | } | |
539 | ||
1da177e4 | 540 | #endif |