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authorThomas Gleixner <tglx@linutronix.de>2007-10-11 05:16:33 -0400
committerThomas Gleixner <tglx@linutronix.de>2007-10-11 05:16:33 -0400
commit44f0257fc316ff4b33aa3438dd8d891b7d6d72b9 (patch)
treec1a9a571db37d631489f18e1dfe5554874b19027 /arch/x86/lib
parentda957e111bb0c189a4a3bf8a00caaecb59ed94ca (diff)
i386: move lib
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/lib')
-rw-r--r--arch/x86/lib/Makefile5
-rw-r--r--arch/x86/lib/Makefile_3211
-rw-r--r--arch/x86/lib/bitops_32.c70
-rw-r--r--arch/x86/lib/checksum_32.S546
-rw-r--r--arch/x86/lib/delay_32.c103
-rw-r--r--arch/x86/lib/getuser_32.S78
-rw-r--r--arch/x86/lib/memcpy_32.c43
-rw-r--r--arch/x86/lib/mmx_32.c403
-rw-r--r--arch/x86/lib/msr-on-cpu.c119
-rw-r--r--arch/x86/lib/putuser_32.S98
-rw-r--r--arch/x86/lib/semaphore_32.S219
-rw-r--r--arch/x86/lib/string_32.c257
-rw-r--r--arch/x86/lib/strstr_32.c31
-rw-r--r--arch/x86/lib/usercopy_32.c882
14 files changed, 2865 insertions, 0 deletions
diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
new file mode 100644
index 000000000000..2d7d724a2a6a
--- /dev/null
+++ b/arch/x86/lib/Makefile
@@ -0,0 +1,5 @@
1ifeq ($(CONFIG_X86_32),y)
2include ${srctree}/arch/x86/lib/Makefile_32
3else
4include ${srctree}/arch/x86_64/lib/Makefile_64
5endif
diff --git a/arch/x86/lib/Makefile_32 b/arch/x86/lib/Makefile_32
new file mode 100644
index 000000000000..98d1f1e2e2ef
--- /dev/null
+++ b/arch/x86/lib/Makefile_32
@@ -0,0 +1,11 @@
1#
2# Makefile for i386-specific library files..
3#
4
5
6lib-y = checksum_32.o delay_32.o usercopy_32.o getuser_32.o putuser_32.o memcpy_32.o strstr_32.o \
7 bitops_32.o semaphore_32.o string_32.o
8
9lib-$(CONFIG_X86_USE_3DNOW) += mmx_32.o
10
11obj-$(CONFIG_SMP) += msr-on-cpu.o
diff --git a/arch/x86/lib/bitops_32.c b/arch/x86/lib/bitops_32.c
new file mode 100644
index 000000000000..afd0045595d4
--- /dev/null
+++ b/arch/x86/lib/bitops_32.c
@@ -0,0 +1,70 @@
1#include <linux/bitops.h>
2#include <linux/module.h>
3
4/**
5 * find_next_bit - find the first set bit in a memory region
6 * @addr: The address to base the search on
7 * @offset: The bitnumber to start searching at
8 * @size: The maximum size to search
9 */
10int find_next_bit(const unsigned long *addr, int size, int offset)
11{
12 const unsigned long *p = addr + (offset >> 5);
13 int set = 0, bit = offset & 31, res;
14
15 if (bit) {
16 /*
17 * Look for nonzero in the first 32 bits:
18 */
19 __asm__("bsfl %1,%0\n\t"
20 "jne 1f\n\t"
21 "movl $32, %0\n"
22 "1:"
23 : "=r" (set)
24 : "r" (*p >> bit));
25 if (set < (32 - bit))
26 return set + offset;
27 set = 32 - bit;
28 p++;
29 }
30 /*
31 * No set bit yet, search remaining full words for a bit
32 */
33 res = find_first_bit (p, size - 32 * (p - addr));
34 return (offset + set + res);
35}
36EXPORT_SYMBOL(find_next_bit);
37
38/**
39 * find_next_zero_bit - find the first zero bit in a memory region
40 * @addr: The address to base the search on
41 * @offset: The bitnumber to start searching at
42 * @size: The maximum size to search
43 */
44int find_next_zero_bit(const unsigned long *addr, int size, int offset)
45{
46 const unsigned long *p = addr + (offset >> 5);
47 int set = 0, bit = offset & 31, res;
48
49 if (bit) {
50 /*
51 * Look for zero in the first 32 bits.
52 */
53 __asm__("bsfl %1,%0\n\t"
54 "jne 1f\n\t"
55 "movl $32, %0\n"
56 "1:"
57 : "=r" (set)
58 : "r" (~(*p >> bit)));
59 if (set < (32 - bit))
60 return set + offset;
61 set = 32 - bit;
62 p++;
63 }
64 /*
65 * No zero yet, search remaining full bytes for a zero
66 */
67 res = find_first_zero_bit(p, size - 32 * (p - addr));
68 return (offset + set + res);
69}
70EXPORT_SYMBOL(find_next_zero_bit);
diff --git a/arch/x86/lib/checksum_32.S b/arch/x86/lib/checksum_32.S
new file mode 100644
index 000000000000..adbccd0bbb78
--- /dev/null
+++ b/arch/x86/lib/checksum_32.S
@@ -0,0 +1,546 @@
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * IP/TCP/UDP checksumming routines
7 *
8 * Authors: Jorge Cwik, <jorge@laser.satlink.net>
9 * Arnt Gulbrandsen, <agulbra@nvg.unit.no>
10 * Tom May, <ftom@netcom.com>
11 * Pentium Pro/II routines:
12 * Alexander Kjeldaas <astor@guardian.no>
13 * Finn Arne Gangstad <finnag@guardian.no>
14 * Lots of code moved from tcp.c and ip.c; see those files
15 * for more names.
16 *
17 * Changes: Ingo Molnar, converted csum_partial_copy() to 2.1 exception
18 * handling.
19 * Andi Kleen, add zeroing on error
20 * converted to pure assembler
21 *
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License
24 * as published by the Free Software Foundation; either version
25 * 2 of the License, or (at your option) any later version.
26 */
27
28#include <linux/linkage.h>
29#include <asm/dwarf2.h>
30#include <asm/errno.h>
31
32/*
33 * computes a partial checksum, e.g. for TCP/UDP fragments
34 */
35
36/*
37unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum)
38 */
39
40.text
41
42#ifndef CONFIG_X86_USE_PPRO_CHECKSUM
43
44 /*
45 * Experiments with Ethernet and SLIP connections show that buff
46 * is aligned on either a 2-byte or 4-byte boundary. We get at
47 * least a twofold speedup on 486 and Pentium if it is 4-byte aligned.
48 * Fortunately, it is easy to convert 2-byte alignment to 4-byte
49 * alignment for the unrolled loop.
50 */
51ENTRY(csum_partial)
52 CFI_STARTPROC
53 pushl %esi
54 CFI_ADJUST_CFA_OFFSET 4
55 CFI_REL_OFFSET esi, 0
56 pushl %ebx
57 CFI_ADJUST_CFA_OFFSET 4
58 CFI_REL_OFFSET ebx, 0
59 movl 20(%esp),%eax # Function arg: unsigned int sum
60 movl 16(%esp),%ecx # Function arg: int len
61 movl 12(%esp),%esi # Function arg: unsigned char *buff
62 testl $3, %esi # Check alignment.
63 jz 2f # Jump if alignment is ok.
64 testl $1, %esi # Check alignment.
65 jz 10f # Jump if alignment is boundary of 2bytes.
66
67 # buf is odd
68 dec %ecx
69 jl 8f
70 movzbl (%esi), %ebx
71 adcl %ebx, %eax
72 roll $8, %eax
73 inc %esi
74 testl $2, %esi
75 jz 2f
7610:
77 subl $2, %ecx # Alignment uses up two bytes.
78 jae 1f # Jump if we had at least two bytes.
79 addl $2, %ecx # ecx was < 2. Deal with it.
80 jmp 4f
811: movw (%esi), %bx
82 addl $2, %esi
83 addw %bx, %ax
84 adcl $0, %eax
852:
86 movl %ecx, %edx
87 shrl $5, %ecx
88 jz 2f
89 testl %esi, %esi
901: movl (%esi), %ebx
91 adcl %ebx, %eax
92 movl 4(%esi), %ebx
93 adcl %ebx, %eax
94 movl 8(%esi), %ebx
95 adcl %ebx, %eax
96 movl 12(%esi), %ebx
97 adcl %ebx, %eax
98 movl 16(%esi), %ebx
99 adcl %ebx, %eax
100 movl 20(%esi), %ebx
101 adcl %ebx, %eax
102 movl 24(%esi), %ebx
103 adcl %ebx, %eax
104 movl 28(%esi), %ebx
105 adcl %ebx, %eax
106 lea 32(%esi), %esi
107 dec %ecx
108 jne 1b
109 adcl $0, %eax
1102: movl %edx, %ecx
111 andl $0x1c, %edx
112 je 4f
113 shrl $2, %edx # This clears CF
1143: adcl (%esi), %eax
115 lea 4(%esi), %esi
116 dec %edx
117 jne 3b
118 adcl $0, %eax
1194: andl $3, %ecx
120 jz 7f
121 cmpl $2, %ecx
122 jb 5f
123 movw (%esi),%cx
124 leal 2(%esi),%esi
125 je 6f
126 shll $16,%ecx
1275: movb (%esi),%cl
1286: addl %ecx,%eax
129 adcl $0, %eax
1307:
131 testl $1, 12(%esp)
132 jz 8f
133 roll $8, %eax
1348:
135 popl %ebx
136 CFI_ADJUST_CFA_OFFSET -4
137 CFI_RESTORE ebx
138 popl %esi
139 CFI_ADJUST_CFA_OFFSET -4
140 CFI_RESTORE esi
141 ret
142 CFI_ENDPROC
143ENDPROC(csum_partial)
144
145#else
146
147/* Version for PentiumII/PPro */
148
149ENTRY(csum_partial)
150 CFI_STARTPROC
151 pushl %esi
152 CFI_ADJUST_CFA_OFFSET 4
153 CFI_REL_OFFSET esi, 0
154 pushl %ebx
155 CFI_ADJUST_CFA_OFFSET 4
156 CFI_REL_OFFSET ebx, 0
157 movl 20(%esp),%eax # Function arg: unsigned int sum
158 movl 16(%esp),%ecx # Function arg: int len
159 movl 12(%esp),%esi # Function arg: const unsigned char *buf
160
161 testl $3, %esi
162 jnz 25f
16310:
164 movl %ecx, %edx
165 movl %ecx, %ebx
166 andl $0x7c, %ebx
167 shrl $7, %ecx
168 addl %ebx,%esi
169 shrl $2, %ebx
170 negl %ebx
171 lea 45f(%ebx,%ebx,2), %ebx
172 testl %esi, %esi
173 jmp *%ebx
174
175 # Handle 2-byte-aligned regions
17620: addw (%esi), %ax
177 lea 2(%esi), %esi
178 adcl $0, %eax
179 jmp 10b
18025:
181 testl $1, %esi
182 jz 30f
183 # buf is odd
184 dec %ecx
185 jl 90f
186 movzbl (%esi), %ebx
187 addl %ebx, %eax
188 adcl $0, %eax
189 roll $8, %eax
190 inc %esi
191 testl $2, %esi
192 jz 10b
193
19430: subl $2, %ecx
195 ja 20b
196 je 32f
197 addl $2, %ecx
198 jz 80f
199 movzbl (%esi),%ebx # csumming 1 byte, 2-aligned
200 addl %ebx, %eax
201 adcl $0, %eax
202 jmp 80f
20332:
204 addw (%esi), %ax # csumming 2 bytes, 2-aligned
205 adcl $0, %eax
206 jmp 80f
207
20840:
209 addl -128(%esi), %eax
210 adcl -124(%esi), %eax
211 adcl -120(%esi), %eax
212 adcl -116(%esi), %eax
213 adcl -112(%esi), %eax
214 adcl -108(%esi), %eax
215 adcl -104(%esi), %eax
216 adcl -100(%esi), %eax
217 adcl -96(%esi), %eax
218 adcl -92(%esi), %eax
219 adcl -88(%esi), %eax
220 adcl -84(%esi), %eax
221 adcl -80(%esi), %eax
222 adcl -76(%esi), %eax
223 adcl -72(%esi), %eax
224 adcl -68(%esi), %eax
225 adcl -64(%esi), %eax
226 adcl -60(%esi), %eax
227 adcl -56(%esi), %eax
228 adcl -52(%esi), %eax
229 adcl -48(%esi), %eax
230 adcl -44(%esi), %eax
231 adcl -40(%esi), %eax
232 adcl -36(%esi), %eax
233 adcl -32(%esi), %eax
234 adcl -28(%esi), %eax
235 adcl -24(%esi), %eax
236 adcl -20(%esi), %eax
237 adcl -16(%esi), %eax
238 adcl -12(%esi), %eax
239 adcl -8(%esi), %eax
240 adcl -4(%esi), %eax
24145:
242 lea 128(%esi), %esi
243 adcl $0, %eax
244 dec %ecx
245 jge 40b
246 movl %edx, %ecx
24750: andl $3, %ecx
248 jz 80f
249
250 # Handle the last 1-3 bytes without jumping
251 notl %ecx # 1->2, 2->1, 3->0, higher bits are masked
252 movl $0xffffff,%ebx # by the shll and shrl instructions
253 shll $3,%ecx
254 shrl %cl,%ebx
255 andl -128(%esi),%ebx # esi is 4-aligned so should be ok
256 addl %ebx,%eax
257 adcl $0,%eax
25880:
259 testl $1, 12(%esp)
260 jz 90f
261 roll $8, %eax
26290:
263 popl %ebx
264 CFI_ADJUST_CFA_OFFSET -4
265 CFI_RESTORE ebx
266 popl %esi
267 CFI_ADJUST_CFA_OFFSET -4
268 CFI_RESTORE esi
269 ret
270 CFI_ENDPROC
271ENDPROC(csum_partial)
272
273#endif
274
275/*
276unsigned int csum_partial_copy_generic (const char *src, char *dst,
277 int len, int sum, int *src_err_ptr, int *dst_err_ptr)
278 */
279
280/*
281 * Copy from ds while checksumming, otherwise like csum_partial
282 *
283 * The macros SRC and DST specify the type of access for the instruction.
284 * thus we can call a custom exception handler for all access types.
285 *
286 * FIXME: could someone double-check whether I haven't mixed up some SRC and
287 * DST definitions? It's damn hard to trigger all cases. I hope I got
288 * them all but there's no guarantee.
289 */
290
291#define SRC(y...) \
292 9999: y; \
293 .section __ex_table, "a"; \
294 .long 9999b, 6001f ; \
295 .previous
296
297#define DST(y...) \
298 9999: y; \
299 .section __ex_table, "a"; \
300 .long 9999b, 6002f ; \
301 .previous
302
303#ifndef CONFIG_X86_USE_PPRO_CHECKSUM
304
305#define ARGBASE 16
306#define FP 12
307
308ENTRY(csum_partial_copy_generic)
309 CFI_STARTPROC
310 subl $4,%esp
311 CFI_ADJUST_CFA_OFFSET 4
312 pushl %edi
313 CFI_ADJUST_CFA_OFFSET 4
314 CFI_REL_OFFSET edi, 0
315 pushl %esi
316 CFI_ADJUST_CFA_OFFSET 4
317 CFI_REL_OFFSET esi, 0
318 pushl %ebx
319 CFI_ADJUST_CFA_OFFSET 4
320 CFI_REL_OFFSET ebx, 0
321 movl ARGBASE+16(%esp),%eax # sum
322 movl ARGBASE+12(%esp),%ecx # len
323 movl ARGBASE+4(%esp),%esi # src
324 movl ARGBASE+8(%esp),%edi # dst
325
326 testl $2, %edi # Check alignment.
327 jz 2f # Jump if alignment is ok.
328 subl $2, %ecx # Alignment uses up two bytes.
329 jae 1f # Jump if we had at least two bytes.
330 addl $2, %ecx # ecx was < 2. Deal with it.
331 jmp 4f
332SRC(1: movw (%esi), %bx )
333 addl $2, %esi
334DST( movw %bx, (%edi) )
335 addl $2, %edi
336 addw %bx, %ax
337 adcl $0, %eax
3382:
339 movl %ecx, FP(%esp)
340 shrl $5, %ecx
341 jz 2f
342 testl %esi, %esi
343SRC(1: movl (%esi), %ebx )
344SRC( movl 4(%esi), %edx )
345 adcl %ebx, %eax
346DST( movl %ebx, (%edi) )
347 adcl %edx, %eax
348DST( movl %edx, 4(%edi) )
349
350SRC( movl 8(%esi), %ebx )
351SRC( movl 12(%esi), %edx )
352 adcl %ebx, %eax
353DST( movl %ebx, 8(%edi) )
354 adcl %edx, %eax
355DST( movl %edx, 12(%edi) )
356
357SRC( movl 16(%esi), %ebx )
358SRC( movl 20(%esi), %edx )
359 adcl %ebx, %eax
360DST( movl %ebx, 16(%edi) )
361 adcl %edx, %eax
362DST( movl %edx, 20(%edi) )
363
364SRC( movl 24(%esi), %ebx )
365SRC( movl 28(%esi), %edx )
366 adcl %ebx, %eax
367DST( movl %ebx, 24(%edi) )
368 adcl %edx, %eax
369DST( movl %edx, 28(%edi) )
370
371 lea 32(%esi), %esi
372 lea 32(%edi), %edi
373 dec %ecx
374 jne 1b
375 adcl $0, %eax
3762: movl FP(%esp), %edx
377 movl %edx, %ecx
378 andl $0x1c, %edx
379 je 4f
380 shrl $2, %edx # This clears CF
381SRC(3: movl (%esi), %ebx )
382 adcl %ebx, %eax
383DST( movl %ebx, (%edi) )
384 lea 4(%esi), %esi
385 lea 4(%edi), %edi
386 dec %edx
387 jne 3b
388 adcl $0, %eax
3894: andl $3, %ecx
390 jz 7f
391 cmpl $2, %ecx
392 jb 5f
393SRC( movw (%esi), %cx )
394 leal 2(%esi), %esi
395DST( movw %cx, (%edi) )
396 leal 2(%edi), %edi
397 je 6f
398 shll $16,%ecx
399SRC(5: movb (%esi), %cl )
400DST( movb %cl, (%edi) )
4016: addl %ecx, %eax
402 adcl $0, %eax
4037:
4045000:
405
406# Exception handler:
407.section .fixup, "ax"
408
4096001:
410 movl ARGBASE+20(%esp), %ebx # src_err_ptr
411 movl $-EFAULT, (%ebx)
412
413 # zero the complete destination - computing the rest
414 # is too much work
415 movl ARGBASE+8(%esp), %edi # dst
416 movl ARGBASE+12(%esp), %ecx # len
417 xorl %eax,%eax
418 rep ; stosb
419
420 jmp 5000b
421
4226002:
423 movl ARGBASE+24(%esp), %ebx # dst_err_ptr
424 movl $-EFAULT,(%ebx)
425 jmp 5000b
426
427.previous
428
429 popl %ebx
430 CFI_ADJUST_CFA_OFFSET -4
431 CFI_RESTORE ebx
432 popl %esi
433 CFI_ADJUST_CFA_OFFSET -4
434 CFI_RESTORE esi
435 popl %edi
436 CFI_ADJUST_CFA_OFFSET -4
437 CFI_RESTORE edi
438 popl %ecx # equivalent to addl $4,%esp
439 CFI_ADJUST_CFA_OFFSET -4
440 ret
441 CFI_ENDPROC
442ENDPROC(csum_partial_copy_generic)
443
444#else
445
446/* Version for PentiumII/PPro */
447
448#define ROUND1(x) \
449 SRC(movl x(%esi), %ebx ) ; \
450 addl %ebx, %eax ; \
451 DST(movl %ebx, x(%edi) ) ;
452
453#define ROUND(x) \
454 SRC(movl x(%esi), %ebx ) ; \
455 adcl %ebx, %eax ; \
456 DST(movl %ebx, x(%edi) ) ;
457
458#define ARGBASE 12
459
460ENTRY(csum_partial_copy_generic)
461 CFI_STARTPROC
462 pushl %ebx
463 CFI_ADJUST_CFA_OFFSET 4
464 CFI_REL_OFFSET ebx, 0
465 pushl %edi
466 CFI_ADJUST_CFA_OFFSET 4
467 CFI_REL_OFFSET edi, 0
468 pushl %esi
469 CFI_ADJUST_CFA_OFFSET 4
470 CFI_REL_OFFSET esi, 0
471 movl ARGBASE+4(%esp),%esi #src
472 movl ARGBASE+8(%esp),%edi #dst
473 movl ARGBASE+12(%esp),%ecx #len
474 movl ARGBASE+16(%esp),%eax #sum
475# movl %ecx, %edx
476 movl %ecx, %ebx
477 movl %esi, %edx
478 shrl $6, %ecx
479 andl $0x3c, %ebx
480 negl %ebx
481 subl %ebx, %esi
482 subl %ebx, %edi
483 lea -1(%esi),%edx
484 andl $-32,%edx
485 lea 3f(%ebx,%ebx), %ebx
486 testl %esi, %esi
487 jmp *%ebx
4881: addl $64,%esi
489 addl $64,%edi
490 SRC(movb -32(%edx),%bl) ; SRC(movb (%edx),%bl)
491 ROUND1(-64) ROUND(-60) ROUND(-56) ROUND(-52)
492 ROUND (-48) ROUND(-44) ROUND(-40) ROUND(-36)
493 ROUND (-32) ROUND(-28) ROUND(-24) ROUND(-20)
494 ROUND (-16) ROUND(-12) ROUND(-8) ROUND(-4)
4953: adcl $0,%eax
496 addl $64, %edx
497 dec %ecx
498 jge 1b
4994: movl ARGBASE+12(%esp),%edx #len
500 andl $3, %edx
501 jz 7f
502 cmpl $2, %edx
503 jb 5f
504SRC( movw (%esi), %dx )
505 leal 2(%esi), %esi
506DST( movw %dx, (%edi) )
507 leal 2(%edi), %edi
508 je 6f
509 shll $16,%edx
5105:
511SRC( movb (%esi), %dl )
512DST( movb %dl, (%edi) )
5136: addl %edx, %eax
514 adcl $0, %eax
5157:
516.section .fixup, "ax"
5176001: movl ARGBASE+20(%esp), %ebx # src_err_ptr
518 movl $-EFAULT, (%ebx)
519 # zero the complete destination (computing the rest is too much work)
520 movl ARGBASE+8(%esp),%edi # dst
521 movl ARGBASE+12(%esp),%ecx # len
522 xorl %eax,%eax
523 rep; stosb
524 jmp 7b
5256002: movl ARGBASE+24(%esp), %ebx # dst_err_ptr
526 movl $-EFAULT, (%ebx)
527 jmp 7b
528.previous
529
530 popl %esi
531 CFI_ADJUST_CFA_OFFSET -4
532 CFI_RESTORE esi
533 popl %edi
534 CFI_ADJUST_CFA_OFFSET -4
535 CFI_RESTORE edi
536 popl %ebx
537 CFI_ADJUST_CFA_OFFSET -4
538 CFI_RESTORE ebx
539 ret
540 CFI_ENDPROC
541ENDPROC(csum_partial_copy_generic)
542
543#undef ROUND
544#undef ROUND1
545
546#endif
diff --git a/arch/x86/lib/delay_32.c b/arch/x86/lib/delay_32.c
new file mode 100644
index 000000000000..f6edb11364df
--- /dev/null
+++ b/arch/x86/lib/delay_32.c
@@ -0,0 +1,103 @@
1/*
2 * Precise Delay Loops for i386
3 *
4 * Copyright (C) 1993 Linus Torvalds
5 * Copyright (C) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
6 *
7 * The __delay function must _NOT_ be inlined as its execution time
8 * depends wildly on alignment on many x86 processors. The additional
9 * jump magic is needed to get the timing stable on all the CPU's
10 * we have to worry about.
11 */
12
13#include <linux/module.h>
14#include <linux/sched.h>
15#include <linux/delay.h>
16
17#include <asm/processor.h>
18#include <asm/delay.h>
19#include <asm/timer.h>
20
21#ifdef CONFIG_SMP
22# include <asm/smp.h>
23#endif
24
25/* simple loop based delay: */
26static void delay_loop(unsigned long loops)
27{
28 int d0;
29
30 __asm__ __volatile__(
31 "\tjmp 1f\n"
32 ".align 16\n"
33 "1:\tjmp 2f\n"
34 ".align 16\n"
35 "2:\tdecl %0\n\tjns 2b"
36 :"=&a" (d0)
37 :"0" (loops));
38}
39
40/* TSC based delay: */
41static void delay_tsc(unsigned long loops)
42{
43 unsigned long bclock, now;
44
45 rdtscl(bclock);
46 do {
47 rep_nop();
48 rdtscl(now);
49 } while ((now-bclock) < loops);
50}
51
52/*
53 * Since we calibrate only once at boot, this
54 * function should be set once at boot and not changed
55 */
56static void (*delay_fn)(unsigned long) = delay_loop;
57
58void use_tsc_delay(void)
59{
60 delay_fn = delay_tsc;
61}
62
63int read_current_timer(unsigned long *timer_val)
64{
65 if (delay_fn == delay_tsc) {
66 rdtscl(*timer_val);
67 return 0;
68 }
69 return -1;
70}
71
72void __delay(unsigned long loops)
73{
74 delay_fn(loops);
75}
76
77inline void __const_udelay(unsigned long xloops)
78{
79 int d0;
80
81 xloops *= 4;
82 __asm__("mull %0"
83 :"=d" (xloops), "=&a" (d0)
84 :"1" (xloops), "0"
85 (cpu_data[raw_smp_processor_id()].loops_per_jiffy * (HZ/4)));
86
87 __delay(++xloops);
88}
89
90void __udelay(unsigned long usecs)
91{
92 __const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */
93}
94
95void __ndelay(unsigned long nsecs)
96{
97 __const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */
98}
99
100EXPORT_SYMBOL(__delay);
101EXPORT_SYMBOL(__const_udelay);
102EXPORT_SYMBOL(__udelay);
103EXPORT_SYMBOL(__ndelay);
diff --git a/arch/x86/lib/getuser_32.S b/arch/x86/lib/getuser_32.S
new file mode 100644
index 000000000000..6d84b53f12a2
--- /dev/null
+++ b/arch/x86/lib/getuser_32.S
@@ -0,0 +1,78 @@
1/*
2 * __get_user functions.
3 *
4 * (C) Copyright 1998 Linus Torvalds
5 *
6 * These functions have a non-standard call interface
7 * to make them more efficient, especially as they
8 * return an error value in addition to the "real"
9 * return value.
10 */
11#include <linux/linkage.h>
12#include <asm/dwarf2.h>
13#include <asm/thread_info.h>
14
15
16/*
17 * __get_user_X
18 *
19 * Inputs: %eax contains the address
20 *
21 * Outputs: %eax is error code (0 or -EFAULT)
22 * %edx contains zero-extended value
23 *
24 * These functions should not modify any other registers,
25 * as they get called from within inline assembly.
26 */
27
28.text
29ENTRY(__get_user_1)
30 CFI_STARTPROC
31 GET_THREAD_INFO(%edx)
32 cmpl TI_addr_limit(%edx),%eax
33 jae bad_get_user
341: movzbl (%eax),%edx
35 xorl %eax,%eax
36 ret
37 CFI_ENDPROC
38ENDPROC(__get_user_1)
39
40ENTRY(__get_user_2)
41 CFI_STARTPROC
42 addl $1,%eax
43 jc bad_get_user
44 GET_THREAD_INFO(%edx)
45 cmpl TI_addr_limit(%edx),%eax
46 jae bad_get_user
472: movzwl -1(%eax),%edx
48 xorl %eax,%eax
49 ret
50 CFI_ENDPROC
51ENDPROC(__get_user_2)
52
53ENTRY(__get_user_4)
54 CFI_STARTPROC
55 addl $3,%eax
56 jc bad_get_user
57 GET_THREAD_INFO(%edx)
58 cmpl TI_addr_limit(%edx),%eax
59 jae bad_get_user
603: movl -3(%eax),%edx
61 xorl %eax,%eax
62 ret
63 CFI_ENDPROC
64ENDPROC(__get_user_4)
65
66bad_get_user:
67 CFI_STARTPROC
68 xorl %edx,%edx
69 movl $-14,%eax
70 ret
71 CFI_ENDPROC
72END(bad_get_user)
73
74.section __ex_table,"a"
75 .long 1b,bad_get_user
76 .long 2b,bad_get_user
77 .long 3b,bad_get_user
78.previous
diff --git a/arch/x86/lib/memcpy_32.c b/arch/x86/lib/memcpy_32.c
new file mode 100644
index 000000000000..8ac51b82a632
--- /dev/null
+++ b/arch/x86/lib/memcpy_32.c
@@ -0,0 +1,43 @@
1#include <linux/string.h>
2#include <linux/module.h>
3
4#undef memcpy
5#undef memset
6
7void *memcpy(void *to, const void *from, size_t n)
8{
9#ifdef CONFIG_X86_USE_3DNOW
10 return __memcpy3d(to, from, n);
11#else
12 return __memcpy(to, from, n);
13#endif
14}
15EXPORT_SYMBOL(memcpy);
16
17void *memset(void *s, int c, size_t count)
18{
19 return __memset(s, c, count);
20}
21EXPORT_SYMBOL(memset);
22
23void *memmove(void *dest, const void *src, size_t n)
24{
25 int d0, d1, d2;
26
27 if (dest < src) {
28 memcpy(dest,src,n);
29 } else {
30 __asm__ __volatile__(
31 "std\n\t"
32 "rep\n\t"
33 "movsb\n\t"
34 "cld"
35 : "=&c" (d0), "=&S" (d1), "=&D" (d2)
36 :"0" (n),
37 "1" (n-1+(const char *)src),
38 "2" (n-1+(char *)dest)
39 :"memory");
40 }
41 return dest;
42}
43EXPORT_SYMBOL(memmove);
diff --git a/arch/x86/lib/mmx_32.c b/arch/x86/lib/mmx_32.c
new file mode 100644
index 000000000000..28084d2e8dd4
--- /dev/null
+++ b/arch/x86/lib/mmx_32.c
@@ -0,0 +1,403 @@
1#include <linux/types.h>
2#include <linux/string.h>
3#include <linux/sched.h>
4#include <linux/hardirq.h>
5#include <linux/module.h>
6
7#include <asm/i387.h>
8
9
10/*
11 * MMX 3DNow! library helper functions
12 *
13 * To do:
14 * We can use MMX just for prefetch in IRQ's. This may be a win.
15 * (reported so on K6-III)
16 * We should use a better code neutral filler for the short jump
17 * leal ebx. [ebx] is apparently best for K6-2, but Cyrix ??
18 * We also want to clobber the filler register so we don't get any
19 * register forwarding stalls on the filler.
20 *
21 * Add *user handling. Checksums are not a win with MMX on any CPU
22 * tested so far for any MMX solution figured.
23 *
24 * 22/09/2000 - Arjan van de Ven
25 * Improved for non-egineering-sample Athlons
26 *
27 */
28
29void *_mmx_memcpy(void *to, const void *from, size_t len)
30{
31 void *p;
32 int i;
33
34 if (unlikely(in_interrupt()))
35 return __memcpy(to, from, len);
36
37 p = to;
38 i = len >> 6; /* len/64 */
39
40 kernel_fpu_begin();
41
42 __asm__ __volatile__ (
43 "1: prefetch (%0)\n" /* This set is 28 bytes */
44 " prefetch 64(%0)\n"
45 " prefetch 128(%0)\n"
46 " prefetch 192(%0)\n"
47 " prefetch 256(%0)\n"
48 "2: \n"
49 ".section .fixup, \"ax\"\n"
50 "3: movw $0x1AEB, 1b\n" /* jmp on 26 bytes */
51 " jmp 2b\n"
52 ".previous\n"
53 ".section __ex_table,\"a\"\n"
54 " .align 4\n"
55 " .long 1b, 3b\n"
56 ".previous"
57 : : "r" (from) );
58
59
60 for(; i>5; i--)
61 {
62 __asm__ __volatile__ (
63 "1: prefetch 320(%0)\n"
64 "2: movq (%0), %%mm0\n"
65 " movq 8(%0), %%mm1\n"
66 " movq 16(%0), %%mm2\n"
67 " movq 24(%0), %%mm3\n"
68 " movq %%mm0, (%1)\n"
69 " movq %%mm1, 8(%1)\n"
70 " movq %%mm2, 16(%1)\n"
71 " movq %%mm3, 24(%1)\n"
72 " movq 32(%0), %%mm0\n"
73 " movq 40(%0), %%mm1\n"
74 " movq 48(%0), %%mm2\n"
75 " movq 56(%0), %%mm3\n"
76 " movq %%mm0, 32(%1)\n"
77 " movq %%mm1, 40(%1)\n"
78 " movq %%mm2, 48(%1)\n"
79 " movq %%mm3, 56(%1)\n"
80 ".section .fixup, \"ax\"\n"
81 "3: movw $0x05EB, 1b\n" /* jmp on 5 bytes */
82 " jmp 2b\n"
83 ".previous\n"
84 ".section __ex_table,\"a\"\n"
85 " .align 4\n"
86 " .long 1b, 3b\n"
87 ".previous"
88 : : "r" (from), "r" (to) : "memory");
89 from+=64;
90 to+=64;
91 }
92
93 for(; i>0; i--)
94 {
95 __asm__ __volatile__ (
96 " movq (%0), %%mm0\n"
97 " movq 8(%0), %%mm1\n"
98 " movq 16(%0), %%mm2\n"
99 " movq 24(%0), %%mm3\n"
100 " movq %%mm0, (%1)\n"
101 " movq %%mm1, 8(%1)\n"
102 " movq %%mm2, 16(%1)\n"
103 " movq %%mm3, 24(%1)\n"
104 " movq 32(%0), %%mm0\n"
105 " movq 40(%0), %%mm1\n"
106 " movq 48(%0), %%mm2\n"
107 " movq 56(%0), %%mm3\n"
108 " movq %%mm0, 32(%1)\n"
109 " movq %%mm1, 40(%1)\n"
110 " movq %%mm2, 48(%1)\n"
111 " movq %%mm3, 56(%1)\n"
112 : : "r" (from), "r" (to) : "memory");
113 from+=64;
114 to+=64;
115 }
116 /*
117 * Now do the tail of the block
118 */
119 __memcpy(to, from, len&63);
120 kernel_fpu_end();
121 return p;
122}
123
124#ifdef CONFIG_MK7
125
126/*
127 * The K7 has streaming cache bypass load/store. The Cyrix III, K6 and
128 * other MMX using processors do not.
129 */
130
131static void fast_clear_page(void *page)
132{
133 int i;
134
135 kernel_fpu_begin();
136
137 __asm__ __volatile__ (
138 " pxor %%mm0, %%mm0\n" : :
139 );
140
141 for(i=0;i<4096/64;i++)
142 {
143 __asm__ __volatile__ (
144 " movntq %%mm0, (%0)\n"
145 " movntq %%mm0, 8(%0)\n"
146 " movntq %%mm0, 16(%0)\n"
147 " movntq %%mm0, 24(%0)\n"
148 " movntq %%mm0, 32(%0)\n"
149 " movntq %%mm0, 40(%0)\n"
150 " movntq %%mm0, 48(%0)\n"
151 " movntq %%mm0, 56(%0)\n"
152 : : "r" (page) : "memory");
153 page+=64;
154 }
155 /* since movntq is weakly-ordered, a "sfence" is needed to become
156 * ordered again.
157 */
158 __asm__ __volatile__ (
159 " sfence \n" : :
160 );
161 kernel_fpu_end();
162}
163
164static void fast_copy_page(void *to, void *from)
165{
166 int i;
167
168 kernel_fpu_begin();
169
170 /* maybe the prefetch stuff can go before the expensive fnsave...
171 * but that is for later. -AV
172 */
173 __asm__ __volatile__ (
174 "1: prefetch (%0)\n"
175 " prefetch 64(%0)\n"
176 " prefetch 128(%0)\n"
177 " prefetch 192(%0)\n"
178 " prefetch 256(%0)\n"
179 "2: \n"
180 ".section .fixup, \"ax\"\n"
181 "3: movw $0x1AEB, 1b\n" /* jmp on 26 bytes */
182 " jmp 2b\n"
183 ".previous\n"
184 ".section __ex_table,\"a\"\n"
185 " .align 4\n"
186 " .long 1b, 3b\n"
187 ".previous"
188 : : "r" (from) );
189
190 for(i=0; i<(4096-320)/64; i++)
191 {
192 __asm__ __volatile__ (
193 "1: prefetch 320(%0)\n"
194 "2: movq (%0), %%mm0\n"
195 " movntq %%mm0, (%1)\n"
196 " movq 8(%0), %%mm1\n"
197 " movntq %%mm1, 8(%1)\n"
198 " movq 16(%0), %%mm2\n"
199 " movntq %%mm2, 16(%1)\n"
200 " movq 24(%0), %%mm3\n"
201 " movntq %%mm3, 24(%1)\n"
202 " movq 32(%0), %%mm4\n"
203 " movntq %%mm4, 32(%1)\n"
204 " movq 40(%0), %%mm5\n"
205 " movntq %%mm5, 40(%1)\n"
206 " movq 48(%0), %%mm6\n"
207 " movntq %%mm6, 48(%1)\n"
208 " movq 56(%0), %%mm7\n"
209 " movntq %%mm7, 56(%1)\n"
210 ".section .fixup, \"ax\"\n"
211 "3: movw $0x05EB, 1b\n" /* jmp on 5 bytes */
212 " jmp 2b\n"
213 ".previous\n"
214 ".section __ex_table,\"a\"\n"
215 " .align 4\n"
216 " .long 1b, 3b\n"
217 ".previous"
218 : : "r" (from), "r" (to) : "memory");
219 from+=64;
220 to+=64;
221 }
222 for(i=(4096-320)/64; i<4096/64; i++)
223 {
224 __asm__ __volatile__ (
225 "2: movq (%0), %%mm0\n"
226 " movntq %%mm0, (%1)\n"
227 " movq 8(%0), %%mm1\n"
228 " movntq %%mm1, 8(%1)\n"
229 " movq 16(%0), %%mm2\n"
230 " movntq %%mm2, 16(%1)\n"
231 " movq 24(%0), %%mm3\n"
232 " movntq %%mm3, 24(%1)\n"
233 " movq 32(%0), %%mm4\n"
234 " movntq %%mm4, 32(%1)\n"
235 " movq 40(%0), %%mm5\n"
236 " movntq %%mm5, 40(%1)\n"
237 " movq 48(%0), %%mm6\n"
238 " movntq %%mm6, 48(%1)\n"
239 " movq 56(%0), %%mm7\n"
240 " movntq %%mm7, 56(%1)\n"
241 : : "r" (from), "r" (to) : "memory");
242 from+=64;
243 to+=64;
244 }
245 /* since movntq is weakly-ordered, a "sfence" is needed to become
246 * ordered again.
247 */
248 __asm__ __volatile__ (
249 " sfence \n" : :
250 );
251 kernel_fpu_end();
252}
253
254#else
255
256/*
257 * Generic MMX implementation without K7 specific streaming
258 */
259
260static void fast_clear_page(void *page)
261{
262 int i;
263
264 kernel_fpu_begin();
265
266 __asm__ __volatile__ (
267 " pxor %%mm0, %%mm0\n" : :
268 );
269
270 for(i=0;i<4096/128;i++)
271 {
272 __asm__ __volatile__ (
273 " movq %%mm0, (%0)\n"
274 " movq %%mm0, 8(%0)\n"
275 " movq %%mm0, 16(%0)\n"
276 " movq %%mm0, 24(%0)\n"
277 " movq %%mm0, 32(%0)\n"
278 " movq %%mm0, 40(%0)\n"
279 " movq %%mm0, 48(%0)\n"
280 " movq %%mm0, 56(%0)\n"
281 " movq %%mm0, 64(%0)\n"
282 " movq %%mm0, 72(%0)\n"
283 " movq %%mm0, 80(%0)\n"
284 " movq %%mm0, 88(%0)\n"
285 " movq %%mm0, 96(%0)\n"
286 " movq %%mm0, 104(%0)\n"
287 " movq %%mm0, 112(%0)\n"
288 " movq %%mm0, 120(%0)\n"
289 : : "r" (page) : "memory");
290 page+=128;
291 }
292
293 kernel_fpu_end();
294}
295
296static void fast_copy_page(void *to, void *from)
297{
298 int i;
299
300
301 kernel_fpu_begin();
302
303 __asm__ __volatile__ (
304 "1: prefetch (%0)\n"
305 " prefetch 64(%0)\n"
306 " prefetch 128(%0)\n"
307 " prefetch 192(%0)\n"
308 " prefetch 256(%0)\n"
309 "2: \n"
310 ".section .fixup, \"ax\"\n"
311 "3: movw $0x1AEB, 1b\n" /* jmp on 26 bytes */
312 " jmp 2b\n"
313 ".previous\n"
314 ".section __ex_table,\"a\"\n"
315 " .align 4\n"
316 " .long 1b, 3b\n"
317 ".previous"
318 : : "r" (from) );
319
320 for(i=0; i<4096/64; i++)
321 {
322 __asm__ __volatile__ (
323 "1: prefetch 320(%0)\n"
324 "2: movq (%0), %%mm0\n"
325 " movq 8(%0), %%mm1\n"
326 " movq 16(%0), %%mm2\n"
327 " movq 24(%0), %%mm3\n"
328 " movq %%mm0, (%1)\n"
329 " movq %%mm1, 8(%1)\n"
330 " movq %%mm2, 16(%1)\n"
331 " movq %%mm3, 24(%1)\n"
332 " movq 32(%0), %%mm0\n"
333 " movq 40(%0), %%mm1\n"
334 " movq 48(%0), %%mm2\n"
335 " movq 56(%0), %%mm3\n"
336 " movq %%mm0, 32(%1)\n"
337 " movq %%mm1, 40(%1)\n"
338 " movq %%mm2, 48(%1)\n"
339 " movq %%mm3, 56(%1)\n"
340 ".section .fixup, \"ax\"\n"
341 "3: movw $0x05EB, 1b\n" /* jmp on 5 bytes */
342 " jmp 2b\n"
343 ".previous\n"
344 ".section __ex_table,\"a\"\n"
345 " .align 4\n"
346 " .long 1b, 3b\n"
347 ".previous"
348 : : "r" (from), "r" (to) : "memory");
349 from+=64;
350 to+=64;
351 }
352 kernel_fpu_end();
353}
354
355
356#endif
357
358/*
359 * Favour MMX for page clear and copy.
360 */
361
362static void slow_zero_page(void * page)
363{
364 int d0, d1;
365 __asm__ __volatile__( \
366 "cld\n\t" \
367 "rep ; stosl" \
368 : "=&c" (d0), "=&D" (d1)
369 :"a" (0),"1" (page),"0" (1024)
370 :"memory");
371}
372
373void mmx_clear_page(void * page)
374{
375 if(unlikely(in_interrupt()))
376 slow_zero_page(page);
377 else
378 fast_clear_page(page);
379}
380
381static void slow_copy_page(void *to, void *from)
382{
383 int d0, d1, d2;
384 __asm__ __volatile__( \
385 "cld\n\t" \
386 "rep ; movsl" \
387 : "=&c" (d0), "=&D" (d1), "=&S" (d2) \
388 : "0" (1024),"1" ((long) to),"2" ((long) from) \
389 : "memory");
390}
391
392
393void mmx_copy_page(void *to, void *from)
394{
395 if(unlikely(in_interrupt()))
396 slow_copy_page(to, from);
397 else
398 fast_copy_page(to, from);
399}
400
401EXPORT_SYMBOL(_mmx_memcpy);
402EXPORT_SYMBOL(mmx_clear_page);
403EXPORT_SYMBOL(mmx_copy_page);
diff --git a/arch/x86/lib/msr-on-cpu.c b/arch/x86/lib/msr-on-cpu.c
new file mode 100644
index 000000000000..7767962f25d3
--- /dev/null
+++ b/arch/x86/lib/msr-on-cpu.c
@@ -0,0 +1,119 @@
1#include <linux/module.h>
2#include <linux/preempt.h>
3#include <linux/smp.h>
4#include <asm/msr.h>
5
6struct msr_info {
7 u32 msr_no;
8 u32 l, h;
9 int err;
10};
11
12static void __rdmsr_on_cpu(void *info)
13{
14 struct msr_info *rv = info;
15
16 rdmsr(rv->msr_no, rv->l, rv->h);
17}
18
19static void __rdmsr_safe_on_cpu(void *info)
20{
21 struct msr_info *rv = info;
22
23 rv->err = rdmsr_safe(rv->msr_no, &rv->l, &rv->h);
24}
25
26static int _rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h, int safe)
27{
28 int err = 0;
29 preempt_disable();
30 if (smp_processor_id() == cpu)
31 if (safe)
32 err = rdmsr_safe(msr_no, l, h);
33 else
34 rdmsr(msr_no, *l, *h);
35 else {
36 struct msr_info rv;
37
38 rv.msr_no = msr_no;
39 if (safe) {
40 smp_call_function_single(cpu, __rdmsr_safe_on_cpu,
41 &rv, 0, 1);
42 err = rv.err;
43 } else {
44 smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 0, 1);
45 }
46 *l = rv.l;
47 *h = rv.h;
48 }
49 preempt_enable();
50 return err;
51}
52
53static void __wrmsr_on_cpu(void *info)
54{
55 struct msr_info *rv = info;
56
57 wrmsr(rv->msr_no, rv->l, rv->h);
58}
59
60static void __wrmsr_safe_on_cpu(void *info)
61{
62 struct msr_info *rv = info;
63
64 rv->err = wrmsr_safe(rv->msr_no, rv->l, rv->h);
65}
66
67static int _wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h, int safe)
68{
69 int err = 0;
70 preempt_disable();
71 if (smp_processor_id() == cpu)
72 if (safe)
73 err = wrmsr_safe(msr_no, l, h);
74 else
75 wrmsr(msr_no, l, h);
76 else {
77 struct msr_info rv;
78
79 rv.msr_no = msr_no;
80 rv.l = l;
81 rv.h = h;
82 if (safe) {
83 smp_call_function_single(cpu, __wrmsr_safe_on_cpu,
84 &rv, 0, 1);
85 err = rv.err;
86 } else {
87 smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 0, 1);
88 }
89 }
90 preempt_enable();
91 return err;
92}
93
94void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
95{
96 _wrmsr_on_cpu(cpu, msr_no, l, h, 0);
97}
98
99void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
100{
101 _rdmsr_on_cpu(cpu, msr_no, l, h, 0);
102}
103
104/* These "safe" variants are slower and should be used when the target MSR
105 may not actually exist. */
106int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
107{
108 return _wrmsr_on_cpu(cpu, msr_no, l, h, 1);
109}
110
111int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
112{
113 return _rdmsr_on_cpu(cpu, msr_no, l, h, 1);
114}
115
116EXPORT_SYMBOL(rdmsr_on_cpu);
117EXPORT_SYMBOL(wrmsr_on_cpu);
118EXPORT_SYMBOL(rdmsr_safe_on_cpu);
119EXPORT_SYMBOL(wrmsr_safe_on_cpu);
diff --git a/arch/x86/lib/putuser_32.S b/arch/x86/lib/putuser_32.S
new file mode 100644
index 000000000000..f58fba109d18
--- /dev/null
+++ b/arch/x86/lib/putuser_32.S
@@ -0,0 +1,98 @@
1/*
2 * __put_user functions.
3 *
4 * (C) Copyright 2005 Linus Torvalds
5 *
6 * These functions have a non-standard call interface
7 * to make them more efficient, especially as they
8 * return an error value in addition to the "real"
9 * return value.
10 */
11#include <linux/linkage.h>
12#include <asm/dwarf2.h>
13#include <asm/thread_info.h>
14
15
16/*
17 * __put_user_X
18 *
19 * Inputs: %eax[:%edx] contains the data
20 * %ecx contains the address
21 *
22 * Outputs: %eax is error code (0 or -EFAULT)
23 *
24 * These functions should not modify any other registers,
25 * as they get called from within inline assembly.
26 */
27
28#define ENTER CFI_STARTPROC ; \
29 pushl %ebx ; \
30 CFI_ADJUST_CFA_OFFSET 4 ; \
31 CFI_REL_OFFSET ebx, 0 ; \
32 GET_THREAD_INFO(%ebx)
33#define EXIT popl %ebx ; \
34 CFI_ADJUST_CFA_OFFSET -4 ; \
35 CFI_RESTORE ebx ; \
36 ret ; \
37 CFI_ENDPROC
38
39.text
40ENTRY(__put_user_1)
41 ENTER
42 cmpl TI_addr_limit(%ebx),%ecx
43 jae bad_put_user
441: movb %al,(%ecx)
45 xorl %eax,%eax
46 EXIT
47ENDPROC(__put_user_1)
48
49ENTRY(__put_user_2)
50 ENTER
51 movl TI_addr_limit(%ebx),%ebx
52 subl $1,%ebx
53 cmpl %ebx,%ecx
54 jae bad_put_user
552: movw %ax,(%ecx)
56 xorl %eax,%eax
57 EXIT
58ENDPROC(__put_user_2)
59
60ENTRY(__put_user_4)
61 ENTER
62 movl TI_addr_limit(%ebx),%ebx
63 subl $3,%ebx
64 cmpl %ebx,%ecx
65 jae bad_put_user
663: movl %eax,(%ecx)
67 xorl %eax,%eax
68 EXIT
69ENDPROC(__put_user_4)
70
71ENTRY(__put_user_8)
72 ENTER
73 movl TI_addr_limit(%ebx),%ebx
74 subl $7,%ebx
75 cmpl %ebx,%ecx
76 jae bad_put_user
774: movl %eax,(%ecx)
785: movl %edx,4(%ecx)
79 xorl %eax,%eax
80 EXIT
81ENDPROC(__put_user_8)
82
83bad_put_user:
84 CFI_STARTPROC simple
85 CFI_DEF_CFA esp, 2*4
86 CFI_OFFSET eip, -1*4
87 CFI_OFFSET ebx, -2*4
88 movl $-14,%eax
89 EXIT
90END(bad_put_user)
91
92.section __ex_table,"a"
93 .long 1b,bad_put_user
94 .long 2b,bad_put_user
95 .long 3b,bad_put_user
96 .long 4b,bad_put_user
97 .long 5b,bad_put_user
98.previous
diff --git a/arch/x86/lib/semaphore_32.S b/arch/x86/lib/semaphore_32.S
new file mode 100644
index 000000000000..c01eb39c0b43
--- /dev/null
+++ b/arch/x86/lib/semaphore_32.S
@@ -0,0 +1,219 @@
1/*
2 * i386 semaphore implementation.
3 *
4 * (C) Copyright 1999 Linus Torvalds
5 *
6 * Portions Copyright 1999 Red Hat, Inc.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 *
13 * rw semaphores implemented November 1999 by Benjamin LaHaise <bcrl@kvack.org>
14 */
15
16#include <linux/linkage.h>
17#include <asm/rwlock.h>
18#include <asm/alternative-asm.i>
19#include <asm/frame.i>
20#include <asm/dwarf2.h>
21
22/*
23 * The semaphore operations have a special calling sequence that
24 * allow us to do a simpler in-line version of them. These routines
25 * need to convert that sequence back into the C sequence when
26 * there is contention on the semaphore.
27 *
28 * %eax contains the semaphore pointer on entry. Save the C-clobbered
29 * registers (%eax, %edx and %ecx) except %eax whish is either a return
30 * value or just clobbered..
31 */
32 .section .sched.text
33ENTRY(__down_failed)
34 CFI_STARTPROC
35 FRAME
36 pushl %edx
37 CFI_ADJUST_CFA_OFFSET 4
38 CFI_REL_OFFSET edx,0
39 pushl %ecx
40 CFI_ADJUST_CFA_OFFSET 4
41 CFI_REL_OFFSET ecx,0
42 call __down
43 popl %ecx
44 CFI_ADJUST_CFA_OFFSET -4
45 CFI_RESTORE ecx
46 popl %edx
47 CFI_ADJUST_CFA_OFFSET -4
48 CFI_RESTORE edx
49 ENDFRAME
50 ret
51 CFI_ENDPROC
52 END(__down_failed)
53
54ENTRY(__down_failed_interruptible)
55 CFI_STARTPROC
56 FRAME
57 pushl %edx
58 CFI_ADJUST_CFA_OFFSET 4
59 CFI_REL_OFFSET edx,0
60 pushl %ecx
61 CFI_ADJUST_CFA_OFFSET 4
62 CFI_REL_OFFSET ecx,0
63 call __down_interruptible
64 popl %ecx
65 CFI_ADJUST_CFA_OFFSET -4
66 CFI_RESTORE ecx
67 popl %edx
68 CFI_ADJUST_CFA_OFFSET -4
69 CFI_RESTORE edx
70 ENDFRAME
71 ret
72 CFI_ENDPROC
73 END(__down_failed_interruptible)
74
75ENTRY(__down_failed_trylock)
76 CFI_STARTPROC
77 FRAME
78 pushl %edx
79 CFI_ADJUST_CFA_OFFSET 4
80 CFI_REL_OFFSET edx,0
81 pushl %ecx
82 CFI_ADJUST_CFA_OFFSET 4
83 CFI_REL_OFFSET ecx,0
84 call __down_trylock
85 popl %ecx
86 CFI_ADJUST_CFA_OFFSET -4
87 CFI_RESTORE ecx
88 popl %edx
89 CFI_ADJUST_CFA_OFFSET -4
90 CFI_RESTORE edx
91 ENDFRAME
92 ret
93 CFI_ENDPROC
94 END(__down_failed_trylock)
95
96ENTRY(__up_wakeup)
97 CFI_STARTPROC
98 FRAME
99 pushl %edx
100 CFI_ADJUST_CFA_OFFSET 4
101 CFI_REL_OFFSET edx,0
102 pushl %ecx
103 CFI_ADJUST_CFA_OFFSET 4
104 CFI_REL_OFFSET ecx,0
105 call __up
106 popl %ecx
107 CFI_ADJUST_CFA_OFFSET -4
108 CFI_RESTORE ecx
109 popl %edx
110 CFI_ADJUST_CFA_OFFSET -4
111 CFI_RESTORE edx
112 ENDFRAME
113 ret
114 CFI_ENDPROC
115 END(__up_wakeup)
116
117/*
118 * rw spinlock fallbacks
119 */
120#ifdef CONFIG_SMP
121ENTRY(__write_lock_failed)
122 CFI_STARTPROC simple
123 FRAME
1242: LOCK_PREFIX
125 addl $ RW_LOCK_BIAS,(%eax)
1261: rep; nop
127 cmpl $ RW_LOCK_BIAS,(%eax)
128 jne 1b
129 LOCK_PREFIX
130 subl $ RW_LOCK_BIAS,(%eax)
131 jnz 2b
132 ENDFRAME
133 ret
134 CFI_ENDPROC
135 END(__write_lock_failed)
136
137ENTRY(__read_lock_failed)
138 CFI_STARTPROC
139 FRAME
1402: LOCK_PREFIX
141 incl (%eax)
1421: rep; nop
143 cmpl $1,(%eax)
144 js 1b
145 LOCK_PREFIX
146 decl (%eax)
147 js 2b
148 ENDFRAME
149 ret
150 CFI_ENDPROC
151 END(__read_lock_failed)
152
153#endif
154
155#ifdef CONFIG_RWSEM_XCHGADD_ALGORITHM
156
157/* Fix up special calling conventions */
158ENTRY(call_rwsem_down_read_failed)
159 CFI_STARTPROC
160 push %ecx
161 CFI_ADJUST_CFA_OFFSET 4
162 CFI_REL_OFFSET ecx,0
163 push %edx
164 CFI_ADJUST_CFA_OFFSET 4
165 CFI_REL_OFFSET edx,0
166 call rwsem_down_read_failed
167 pop %edx
168 CFI_ADJUST_CFA_OFFSET -4
169 pop %ecx
170 CFI_ADJUST_CFA_OFFSET -4
171 ret
172 CFI_ENDPROC
173 END(call_rwsem_down_read_failed)
174
175ENTRY(call_rwsem_down_write_failed)
176 CFI_STARTPROC
177 push %ecx
178 CFI_ADJUST_CFA_OFFSET 4
179 CFI_REL_OFFSET ecx,0
180 calll rwsem_down_write_failed
181 pop %ecx
182 CFI_ADJUST_CFA_OFFSET -4
183 ret
184 CFI_ENDPROC
185 END(call_rwsem_down_write_failed)
186
187ENTRY(call_rwsem_wake)
188 CFI_STARTPROC
189 decw %dx /* do nothing if still outstanding active readers */
190 jnz 1f
191 push %ecx
192 CFI_ADJUST_CFA_OFFSET 4
193 CFI_REL_OFFSET ecx,0
194 call rwsem_wake
195 pop %ecx
196 CFI_ADJUST_CFA_OFFSET -4
1971: ret
198 CFI_ENDPROC
199 END(call_rwsem_wake)
200
201/* Fix up special calling conventions */
202ENTRY(call_rwsem_downgrade_wake)
203 CFI_STARTPROC
204 push %ecx
205 CFI_ADJUST_CFA_OFFSET 4
206 CFI_REL_OFFSET ecx,0
207 push %edx
208 CFI_ADJUST_CFA_OFFSET 4
209 CFI_REL_OFFSET edx,0
210 call rwsem_downgrade_wake
211 pop %edx
212 CFI_ADJUST_CFA_OFFSET -4
213 pop %ecx
214 CFI_ADJUST_CFA_OFFSET -4
215 ret
216 CFI_ENDPROC
217 END(call_rwsem_downgrade_wake)
218
219#endif
diff --git a/arch/x86/lib/string_32.c b/arch/x86/lib/string_32.c
new file mode 100644
index 000000000000..2c773fefa3dd
--- /dev/null
+++ b/arch/x86/lib/string_32.c
@@ -0,0 +1,257 @@
1/*
2 * Most of the string-functions are rather heavily hand-optimized,
3 * see especially strsep,strstr,str[c]spn. They should work, but are not
4 * very easy to understand. Everything is done entirely within the register
5 * set, making the functions fast and clean. String instructions have been
6 * used through-out, making for "slightly" unclear code :-)
7 *
8 * AK: On P4 and K7 using non string instruction implementations might be faster
9 * for large memory blocks. But most of them are unlikely to be used on large
10 * strings.
11 */
12
13#include <linux/string.h>
14#include <linux/module.h>
15
16#ifdef __HAVE_ARCH_STRCPY
17char *strcpy(char * dest,const char *src)
18{
19 int d0, d1, d2;
20 asm volatile( "1:\tlodsb\n\t"
21 "stosb\n\t"
22 "testb %%al,%%al\n\t"
23 "jne 1b"
24 : "=&S" (d0), "=&D" (d1), "=&a" (d2)
25 :"0" (src),"1" (dest) : "memory");
26 return dest;
27}
28EXPORT_SYMBOL(strcpy);
29#endif
30
31#ifdef __HAVE_ARCH_STRNCPY
32char *strncpy(char * dest,const char *src,size_t count)
33{
34 int d0, d1, d2, d3;
35 asm volatile( "1:\tdecl %2\n\t"
36 "js 2f\n\t"
37 "lodsb\n\t"
38 "stosb\n\t"
39 "testb %%al,%%al\n\t"
40 "jne 1b\n\t"
41 "rep\n\t"
42 "stosb\n"
43 "2:"
44 : "=&S" (d0), "=&D" (d1), "=&c" (d2), "=&a" (d3)
45 :"0" (src),"1" (dest),"2" (count) : "memory");
46 return dest;
47}
48EXPORT_SYMBOL(strncpy);
49#endif
50
51#ifdef __HAVE_ARCH_STRCAT
52char *strcat(char * dest,const char * src)
53{
54 int d0, d1, d2, d3;
55 asm volatile( "repne\n\t"
56 "scasb\n\t"
57 "decl %1\n"
58 "1:\tlodsb\n\t"
59 "stosb\n\t"
60 "testb %%al,%%al\n\t"
61 "jne 1b"
62 : "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3)
63 : "0" (src), "1" (dest), "2" (0), "3" (0xffffffffu): "memory");
64 return dest;
65}
66EXPORT_SYMBOL(strcat);
67#endif
68
69#ifdef __HAVE_ARCH_STRNCAT
70char *strncat(char * dest,const char * src,size_t count)
71{
72 int d0, d1, d2, d3;
73 asm volatile( "repne\n\t"
74 "scasb\n\t"
75 "decl %1\n\t"
76 "movl %8,%3\n"
77 "1:\tdecl %3\n\t"
78 "js 2f\n\t"
79 "lodsb\n\t"
80 "stosb\n\t"
81 "testb %%al,%%al\n\t"
82 "jne 1b\n"
83 "2:\txorl %2,%2\n\t"
84 "stosb"
85 : "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3)
86 : "0" (src),"1" (dest),"2" (0),"3" (0xffffffffu), "g" (count)
87 : "memory");
88 return dest;
89}
90EXPORT_SYMBOL(strncat);
91#endif
92
93#ifdef __HAVE_ARCH_STRCMP
94int strcmp(const char * cs,const char * ct)
95{
96 int d0, d1;
97 int res;
98 asm volatile( "1:\tlodsb\n\t"
99 "scasb\n\t"
100 "jne 2f\n\t"
101 "testb %%al,%%al\n\t"
102 "jne 1b\n\t"
103 "xorl %%eax,%%eax\n\t"
104 "jmp 3f\n"
105 "2:\tsbbl %%eax,%%eax\n\t"
106 "orb $1,%%al\n"
107 "3:"
108 :"=a" (res), "=&S" (d0), "=&D" (d1)
109 :"1" (cs),"2" (ct)
110 :"memory");
111 return res;
112}
113EXPORT_SYMBOL(strcmp);
114#endif
115
116#ifdef __HAVE_ARCH_STRNCMP
117int strncmp(const char * cs,const char * ct,size_t count)
118{
119 int res;
120 int d0, d1, d2;
121 asm volatile( "1:\tdecl %3\n\t"
122 "js 2f\n\t"
123 "lodsb\n\t"
124 "scasb\n\t"
125 "jne 3f\n\t"
126 "testb %%al,%%al\n\t"
127 "jne 1b\n"
128 "2:\txorl %%eax,%%eax\n\t"
129 "jmp 4f\n"
130 "3:\tsbbl %%eax,%%eax\n\t"
131 "orb $1,%%al\n"
132 "4:"
133 :"=a" (res), "=&S" (d0), "=&D" (d1), "=&c" (d2)
134 :"1" (cs),"2" (ct),"3" (count)
135 :"memory");
136 return res;
137}
138EXPORT_SYMBOL(strncmp);
139#endif
140
141#ifdef __HAVE_ARCH_STRCHR
142char *strchr(const char * s, int c)
143{
144 int d0;
145 char * res;
146 asm volatile( "movb %%al,%%ah\n"
147 "1:\tlodsb\n\t"
148 "cmpb %%ah,%%al\n\t"
149 "je 2f\n\t"
150 "testb %%al,%%al\n\t"
151 "jne 1b\n\t"
152 "movl $1,%1\n"
153 "2:\tmovl %1,%0\n\t"
154 "decl %0"
155 :"=a" (res), "=&S" (d0)
156 :"1" (s),"0" (c)
157 :"memory");
158 return res;
159}
160EXPORT_SYMBOL(strchr);
161#endif
162
163#ifdef __HAVE_ARCH_STRRCHR
164char *strrchr(const char * s, int c)
165{
166 int d0, d1;
167 char * res;
168 asm volatile( "movb %%al,%%ah\n"
169 "1:\tlodsb\n\t"
170 "cmpb %%ah,%%al\n\t"
171 "jne 2f\n\t"
172 "leal -1(%%esi),%0\n"
173 "2:\ttestb %%al,%%al\n\t"
174 "jne 1b"
175 :"=g" (res), "=&S" (d0), "=&a" (d1)
176 :"0" (0),"1" (s),"2" (c)
177 :"memory");
178 return res;
179}
180EXPORT_SYMBOL(strrchr);
181#endif
182
183#ifdef __HAVE_ARCH_STRLEN
184size_t strlen(const char * s)
185{
186 int d0;
187 int res;
188 asm volatile( "repne\n\t"
189 "scasb\n\t"
190 "notl %0\n\t"
191 "decl %0"
192 :"=c" (res), "=&D" (d0)
193 :"1" (s),"a" (0), "0" (0xffffffffu)
194 :"memory");
195 return res;
196}
197EXPORT_SYMBOL(strlen);
198#endif
199
200#ifdef __HAVE_ARCH_MEMCHR
201void *memchr(const void *cs,int c,size_t count)
202{
203 int d0;
204 void *res;
205 if (!count)
206 return NULL;
207 asm volatile( "repne\n\t"
208 "scasb\n\t"
209 "je 1f\n\t"
210 "movl $1,%0\n"
211 "1:\tdecl %0"
212 :"=D" (res), "=&c" (d0)
213 :"a" (c),"0" (cs),"1" (count)
214 :"memory");
215 return res;
216}
217EXPORT_SYMBOL(memchr);
218#endif
219
220#ifdef __HAVE_ARCH_MEMSCAN
221void *memscan(void * addr, int c, size_t size)
222{
223 if (!size)
224 return addr;
225 asm volatile("repnz; scasb\n\t"
226 "jnz 1f\n\t"
227 "dec %%edi\n"
228 "1:"
229 : "=D" (addr), "=c" (size)
230 : "0" (addr), "1" (size), "a" (c)
231 : "memory");
232 return addr;
233}
234EXPORT_SYMBOL(memscan);
235#endif
236
237#ifdef __HAVE_ARCH_STRNLEN
238size_t strnlen(const char *s, size_t count)
239{
240 int d0;
241 int res;
242 asm volatile( "movl %2,%0\n\t"
243 "jmp 2f\n"
244 "1:\tcmpb $0,(%0)\n\t"
245 "je 3f\n\t"
246 "incl %0\n"
247 "2:\tdecl %1\n\t"
248 "cmpl $-1,%1\n\t"
249 "jne 1b\n"
250 "3:\tsubl %2,%0"
251 :"=a" (res), "=&d" (d0)
252 :"c" (s),"1" (count)
253 :"memory");
254 return res;
255}
256EXPORT_SYMBOL(strnlen);
257#endif
diff --git a/arch/x86/lib/strstr_32.c b/arch/x86/lib/strstr_32.c
new file mode 100644
index 000000000000..a3dafbf59dae
--- /dev/null
+++ b/arch/x86/lib/strstr_32.c
@@ -0,0 +1,31 @@
1#include <linux/string.h>
2
3char * strstr(const char * cs,const char * ct)
4{
5int d0, d1;
6register char * __res;
7__asm__ __volatile__(
8 "movl %6,%%edi\n\t"
9 "repne\n\t"
10 "scasb\n\t"
11 "notl %%ecx\n\t"
12 "decl %%ecx\n\t" /* NOTE! This also sets Z if searchstring='' */
13 "movl %%ecx,%%edx\n"
14 "1:\tmovl %6,%%edi\n\t"
15 "movl %%esi,%%eax\n\t"
16 "movl %%edx,%%ecx\n\t"
17 "repe\n\t"
18 "cmpsb\n\t"
19 "je 2f\n\t" /* also works for empty string, see above */
20 "xchgl %%eax,%%esi\n\t"
21 "incl %%esi\n\t"
22 "cmpb $0,-1(%%eax)\n\t"
23 "jne 1b\n\t"
24 "xorl %%eax,%%eax\n\t"
25 "2:"
26 :"=a" (__res), "=&c" (d0), "=&S" (d1)
27 :"0" (0), "1" (0xffffffff), "2" (cs), "g" (ct)
28 :"dx", "di");
29return __res;
30}
31
diff --git a/arch/x86/lib/usercopy_32.c b/arch/x86/lib/usercopy_32.c
new file mode 100644
index 000000000000..9f38b12b4af1
--- /dev/null
+++ b/arch/x86/lib/usercopy_32.c
@@ -0,0 +1,882 @@
1/*
2 * User address space access functions.
3 * The non inlined parts of asm-i386/uaccess.h are here.
4 *
5 * Copyright 1997 Andi Kleen <ak@muc.de>
6 * Copyright 1997 Linus Torvalds
7 */
8#include <linux/mm.h>
9#include <linux/highmem.h>
10#include <linux/blkdev.h>
11#include <linux/module.h>
12#include <linux/backing-dev.h>
13#include <linux/interrupt.h>
14#include <asm/uaccess.h>
15#include <asm/mmx.h>
16
17static inline int __movsl_is_ok(unsigned long a1, unsigned long a2, unsigned long n)
18{
19#ifdef CONFIG_X86_INTEL_USERCOPY
20 if (n >= 64 && ((a1 ^ a2) & movsl_mask.mask))
21 return 0;
22#endif
23 return 1;
24}
25#define movsl_is_ok(a1,a2,n) \
26 __movsl_is_ok((unsigned long)(a1),(unsigned long)(a2),(n))
27
28/*
29 * Copy a null terminated string from userspace.
30 */
31
32#define __do_strncpy_from_user(dst,src,count,res) \
33do { \
34 int __d0, __d1, __d2; \
35 might_sleep(); \
36 __asm__ __volatile__( \
37 " testl %1,%1\n" \
38 " jz 2f\n" \
39 "0: lodsb\n" \
40 " stosb\n" \
41 " testb %%al,%%al\n" \
42 " jz 1f\n" \
43 " decl %1\n" \
44 " jnz 0b\n" \
45 "1: subl %1,%0\n" \
46 "2:\n" \
47 ".section .fixup,\"ax\"\n" \
48 "3: movl %5,%0\n" \
49 " jmp 2b\n" \
50 ".previous\n" \
51 ".section __ex_table,\"a\"\n" \
52 " .align 4\n" \
53 " .long 0b,3b\n" \
54 ".previous" \
55 : "=d"(res), "=c"(count), "=&a" (__d0), "=&S" (__d1), \
56 "=&D" (__d2) \
57 : "i"(-EFAULT), "0"(count), "1"(count), "3"(src), "4"(dst) \
58 : "memory"); \
59} while (0)
60
61/**
62 * __strncpy_from_user: - Copy a NUL terminated string from userspace, with less checking.
63 * @dst: Destination address, in kernel space. This buffer must be at
64 * least @count bytes long.
65 * @src: Source address, in user space.
66 * @count: Maximum number of bytes to copy, including the trailing NUL.
67 *
68 * Copies a NUL-terminated string from userspace to kernel space.
69 * Caller must check the specified block with access_ok() before calling
70 * this function.
71 *
72 * On success, returns the length of the string (not including the trailing
73 * NUL).
74 *
75 * If access to userspace fails, returns -EFAULT (some data may have been
76 * copied).
77 *
78 * If @count is smaller than the length of the string, copies @count bytes
79 * and returns @count.
80 */
81long
82__strncpy_from_user(char *dst, const char __user *src, long count)
83{
84 long res;
85 __do_strncpy_from_user(dst, src, count, res);
86 return res;
87}
88EXPORT_SYMBOL(__strncpy_from_user);
89
90/**
91 * strncpy_from_user: - Copy a NUL terminated string from userspace.
92 * @dst: Destination address, in kernel space. This buffer must be at
93 * least @count bytes long.
94 * @src: Source address, in user space.
95 * @count: Maximum number of bytes to copy, including the trailing NUL.
96 *
97 * Copies a NUL-terminated string from userspace to kernel space.
98 *
99 * On success, returns the length of the string (not including the trailing
100 * NUL).
101 *
102 * If access to userspace fails, returns -EFAULT (some data may have been
103 * copied).
104 *
105 * If @count is smaller than the length of the string, copies @count bytes
106 * and returns @count.
107 */
108long
109strncpy_from_user(char *dst, const char __user *src, long count)
110{
111 long res = -EFAULT;
112 if (access_ok(VERIFY_READ, src, 1))
113 __do_strncpy_from_user(dst, src, count, res);
114 return res;
115}
116EXPORT_SYMBOL(strncpy_from_user);
117
118/*
119 * Zero Userspace
120 */
121
122#define __do_clear_user(addr,size) \
123do { \
124 int __d0; \
125 might_sleep(); \
126 __asm__ __volatile__( \
127 "0: rep; stosl\n" \
128 " movl %2,%0\n" \
129 "1: rep; stosb\n" \
130 "2:\n" \
131 ".section .fixup,\"ax\"\n" \
132 "3: lea 0(%2,%0,4),%0\n" \
133 " jmp 2b\n" \
134 ".previous\n" \
135 ".section __ex_table,\"a\"\n" \
136 " .align 4\n" \
137 " .long 0b,3b\n" \
138 " .long 1b,2b\n" \
139 ".previous" \
140 : "=&c"(size), "=&D" (__d0) \
141 : "r"(size & 3), "0"(size / 4), "1"(addr), "a"(0)); \
142} while (0)
143
144/**
145 * clear_user: - Zero a block of memory in user space.
146 * @to: Destination address, in user space.
147 * @n: Number of bytes to zero.
148 *
149 * Zero a block of memory in user space.
150 *
151 * Returns number of bytes that could not be cleared.
152 * On success, this will be zero.
153 */
154unsigned long
155clear_user(void __user *to, unsigned long n)
156{
157 might_sleep();
158 if (access_ok(VERIFY_WRITE, to, n))
159 __do_clear_user(to, n);
160 return n;
161}
162EXPORT_SYMBOL(clear_user);
163
164/**
165 * __clear_user: - Zero a block of memory in user space, with less checking.
166 * @to: Destination address, in user space.
167 * @n: Number of bytes to zero.
168 *
169 * Zero a block of memory in user space. Caller must check
170 * the specified block with access_ok() before calling this function.
171 *
172 * Returns number of bytes that could not be cleared.
173 * On success, this will be zero.
174 */
175unsigned long
176__clear_user(void __user *to, unsigned long n)
177{
178 __do_clear_user(to, n);
179 return n;
180}
181EXPORT_SYMBOL(__clear_user);
182
183/**
184 * strnlen_user: - Get the size of a string in user space.
185 * @s: The string to measure.
186 * @n: The maximum valid length
187 *
188 * Get the size of a NUL-terminated string in user space.
189 *
190 * Returns the size of the string INCLUDING the terminating NUL.
191 * On exception, returns 0.
192 * If the string is too long, returns a value greater than @n.
193 */
194long strnlen_user(const char __user *s, long n)
195{
196 unsigned long mask = -__addr_ok(s);
197 unsigned long res, tmp;
198
199 might_sleep();
200
201 __asm__ __volatile__(
202 " testl %0, %0\n"
203 " jz 3f\n"
204 " andl %0,%%ecx\n"
205 "0: repne; scasb\n"
206 " setne %%al\n"
207 " subl %%ecx,%0\n"
208 " addl %0,%%eax\n"
209 "1:\n"
210 ".section .fixup,\"ax\"\n"
211 "2: xorl %%eax,%%eax\n"
212 " jmp 1b\n"
213 "3: movb $1,%%al\n"
214 " jmp 1b\n"
215 ".previous\n"
216 ".section __ex_table,\"a\"\n"
217 " .align 4\n"
218 " .long 0b,2b\n"
219 ".previous"
220 :"=r" (n), "=D" (s), "=a" (res), "=c" (tmp)
221 :"0" (n), "1" (s), "2" (0), "3" (mask)
222 :"cc");
223 return res & mask;
224}
225EXPORT_SYMBOL(strnlen_user);
226
227#ifdef CONFIG_X86_INTEL_USERCOPY
228static unsigned long
229__copy_user_intel(void __user *to, const void *from, unsigned long size)
230{
231 int d0, d1;
232 __asm__ __volatile__(
233 " .align 2,0x90\n"
234 "1: movl 32(%4), %%eax\n"
235 " cmpl $67, %0\n"
236 " jbe 3f\n"
237 "2: movl 64(%4), %%eax\n"
238 " .align 2,0x90\n"
239 "3: movl 0(%4), %%eax\n"
240 "4: movl 4(%4), %%edx\n"
241 "5: movl %%eax, 0(%3)\n"
242 "6: movl %%edx, 4(%3)\n"
243 "7: movl 8(%4), %%eax\n"
244 "8: movl 12(%4),%%edx\n"
245 "9: movl %%eax, 8(%3)\n"
246 "10: movl %%edx, 12(%3)\n"
247 "11: movl 16(%4), %%eax\n"
248 "12: movl 20(%4), %%edx\n"
249 "13: movl %%eax, 16(%3)\n"
250 "14: movl %%edx, 20(%3)\n"
251 "15: movl 24(%4), %%eax\n"
252 "16: movl 28(%4), %%edx\n"
253 "17: movl %%eax, 24(%3)\n"
254 "18: movl %%edx, 28(%3)\n"
255 "19: movl 32(%4), %%eax\n"
256 "20: movl 36(%4), %%edx\n"
257 "21: movl %%eax, 32(%3)\n"
258 "22: movl %%edx, 36(%3)\n"
259 "23: movl 40(%4), %%eax\n"
260 "24: movl 44(%4), %%edx\n"
261 "25: movl %%eax, 40(%3)\n"
262 "26: movl %%edx, 44(%3)\n"
263 "27: movl 48(%4), %%eax\n"
264 "28: movl 52(%4), %%edx\n"
265 "29: movl %%eax, 48(%3)\n"
266 "30: movl %%edx, 52(%3)\n"
267 "31: movl 56(%4), %%eax\n"
268 "32: movl 60(%4), %%edx\n"
269 "33: movl %%eax, 56(%3)\n"
270 "34: movl %%edx, 60(%3)\n"
271 " addl $-64, %0\n"
272 " addl $64, %4\n"
273 " addl $64, %3\n"
274 " cmpl $63, %0\n"
275 " ja 1b\n"
276 "35: movl %0, %%eax\n"
277 " shrl $2, %0\n"
278 " andl $3, %%eax\n"
279 " cld\n"
280 "99: rep; movsl\n"
281 "36: movl %%eax, %0\n"
282 "37: rep; movsb\n"
283 "100:\n"
284 ".section .fixup,\"ax\"\n"
285 "101: lea 0(%%eax,%0,4),%0\n"
286 " jmp 100b\n"
287 ".previous\n"
288 ".section __ex_table,\"a\"\n"
289 " .align 4\n"
290 " .long 1b,100b\n"
291 " .long 2b,100b\n"
292 " .long 3b,100b\n"
293 " .long 4b,100b\n"
294 " .long 5b,100b\n"
295 " .long 6b,100b\n"
296 " .long 7b,100b\n"
297 " .long 8b,100b\n"
298 " .long 9b,100b\n"
299 " .long 10b,100b\n"
300 " .long 11b,100b\n"
301 " .long 12b,100b\n"
302 " .long 13b,100b\n"
303 " .long 14b,100b\n"
304 " .long 15b,100b\n"
305 " .long 16b,100b\n"
306 " .long 17b,100b\n"
307 " .long 18b,100b\n"
308 " .long 19b,100b\n"
309 " .long 20b,100b\n"
310 " .long 21b,100b\n"
311 " .long 22b,100b\n"
312 " .long 23b,100b\n"
313 " .long 24b,100b\n"
314 " .long 25b,100b\n"
315 " .long 26b,100b\n"
316 " .long 27b,100b\n"
317 " .long 28b,100b\n"
318 " .long 29b,100b\n"
319 " .long 30b,100b\n"
320 " .long 31b,100b\n"
321 " .long 32b,100b\n"
322 " .long 33b,100b\n"
323 " .long 34b,100b\n"
324 " .long 35b,100b\n"
325 " .long 36b,100b\n"
326 " .long 37b,100b\n"
327 " .long 99b,101b\n"
328 ".previous"
329 : "=&c"(size), "=&D" (d0), "=&S" (d1)
330 : "1"(to), "2"(from), "0"(size)
331 : "eax", "edx", "memory");
332 return size;
333}
334
335static unsigned long
336__copy_user_zeroing_intel(void *to, const void __user *from, unsigned long size)
337{
338 int d0, d1;
339 __asm__ __volatile__(
340 " .align 2,0x90\n"
341 "0: movl 32(%4), %%eax\n"
342 " cmpl $67, %0\n"
343 " jbe 2f\n"
344 "1: movl 64(%4), %%eax\n"
345 " .align 2,0x90\n"
346 "2: movl 0(%4), %%eax\n"
347 "21: movl 4(%4), %%edx\n"
348 " movl %%eax, 0(%3)\n"
349 " movl %%edx, 4(%3)\n"
350 "3: movl 8(%4), %%eax\n"
351 "31: movl 12(%4),%%edx\n"
352 " movl %%eax, 8(%3)\n"
353 " movl %%edx, 12(%3)\n"
354 "4: movl 16(%4), %%eax\n"
355 "41: movl 20(%4), %%edx\n"
356 " movl %%eax, 16(%3)\n"
357 " movl %%edx, 20(%3)\n"
358 "10: movl 24(%4), %%eax\n"
359 "51: movl 28(%4), %%edx\n"
360 " movl %%eax, 24(%3)\n"
361 " movl %%edx, 28(%3)\n"
362 "11: movl 32(%4), %%eax\n"
363 "61: movl 36(%4), %%edx\n"
364 " movl %%eax, 32(%3)\n"
365 " movl %%edx, 36(%3)\n"
366 "12: movl 40(%4), %%eax\n"
367 "71: movl 44(%4), %%edx\n"
368 " movl %%eax, 40(%3)\n"
369 " movl %%edx, 44(%3)\n"
370 "13: movl 48(%4), %%eax\n"
371 "81: movl 52(%4), %%edx\n"
372 " movl %%eax, 48(%3)\n"
373 " movl %%edx, 52(%3)\n"
374 "14: movl 56(%4), %%eax\n"
375 "91: movl 60(%4), %%edx\n"
376 " movl %%eax, 56(%3)\n"
377 " movl %%edx, 60(%3)\n"
378 " addl $-64, %0\n"
379 " addl $64, %4\n"
380 " addl $64, %3\n"
381 " cmpl $63, %0\n"
382 " ja 0b\n"
383 "5: movl %0, %%eax\n"
384 " shrl $2, %0\n"
385 " andl $3, %%eax\n"
386 " cld\n"
387 "6: rep; movsl\n"
388 " movl %%eax,%0\n"
389 "7: rep; movsb\n"
390 "8:\n"
391 ".section .fixup,\"ax\"\n"
392 "9: lea 0(%%eax,%0,4),%0\n"
393 "16: pushl %0\n"
394 " pushl %%eax\n"
395 " xorl %%eax,%%eax\n"
396 " rep; stosb\n"
397 " popl %%eax\n"
398 " popl %0\n"
399 " jmp 8b\n"
400 ".previous\n"
401 ".section __ex_table,\"a\"\n"
402 " .align 4\n"
403 " .long 0b,16b\n"
404 " .long 1b,16b\n"
405 " .long 2b,16b\n"
406 " .long 21b,16b\n"
407 " .long 3b,16b\n"
408 " .long 31b,16b\n"
409 " .long 4b,16b\n"
410 " .long 41b,16b\n"
411 " .long 10b,16b\n"
412 " .long 51b,16b\n"
413 " .long 11b,16b\n"
414 " .long 61b,16b\n"
415 " .long 12b,16b\n"
416 " .long 71b,16b\n"
417 " .long 13b,16b\n"
418 " .long 81b,16b\n"
419 " .long 14b,16b\n"
420 " .long 91b,16b\n"
421 " .long 6b,9b\n"
422 " .long 7b,16b\n"
423 ".previous"
424 : "=&c"(size), "=&D" (d0), "=&S" (d1)
425 : "1"(to), "2"(from), "0"(size)
426 : "eax", "edx", "memory");
427 return size;
428}
429
430/*
431 * Non Temporal Hint version of __copy_user_zeroing_intel. It is cache aware.
432 * hyoshiok@miraclelinux.com
433 */
434
435static unsigned long __copy_user_zeroing_intel_nocache(void *to,
436 const void __user *from, unsigned long size)
437{
438 int d0, d1;
439
440 __asm__ __volatile__(
441 " .align 2,0x90\n"
442 "0: movl 32(%4), %%eax\n"
443 " cmpl $67, %0\n"
444 " jbe 2f\n"
445 "1: movl 64(%4), %%eax\n"
446 " .align 2,0x90\n"
447 "2: movl 0(%4), %%eax\n"
448 "21: movl 4(%4), %%edx\n"
449 " movnti %%eax, 0(%3)\n"
450 " movnti %%edx, 4(%3)\n"
451 "3: movl 8(%4), %%eax\n"
452 "31: movl 12(%4),%%edx\n"
453 " movnti %%eax, 8(%3)\n"
454 " movnti %%edx, 12(%3)\n"
455 "4: movl 16(%4), %%eax\n"
456 "41: movl 20(%4), %%edx\n"
457 " movnti %%eax, 16(%3)\n"
458 " movnti %%edx, 20(%3)\n"
459 "10: movl 24(%4), %%eax\n"
460 "51: movl 28(%4), %%edx\n"
461 " movnti %%eax, 24(%3)\n"
462 " movnti %%edx, 28(%3)\n"
463 "11: movl 32(%4), %%eax\n"
464 "61: movl 36(%4), %%edx\n"
465 " movnti %%eax, 32(%3)\n"
466 " movnti %%edx, 36(%3)\n"
467 "12: movl 40(%4), %%eax\n"
468 "71: movl 44(%4), %%edx\n"
469 " movnti %%eax, 40(%3)\n"
470 " movnti %%edx, 44(%3)\n"
471 "13: movl 48(%4), %%eax\n"
472 "81: movl 52(%4), %%edx\n"
473 " movnti %%eax, 48(%3)\n"
474 " movnti %%edx, 52(%3)\n"
475 "14: movl 56(%4), %%eax\n"
476 "91: movl 60(%4), %%edx\n"
477 " movnti %%eax, 56(%3)\n"
478 " movnti %%edx, 60(%3)\n"
479 " addl $-64, %0\n"
480 " addl $64, %4\n"
481 " addl $64, %3\n"
482 " cmpl $63, %0\n"
483 " ja 0b\n"
484 " sfence \n"
485 "5: movl %0, %%eax\n"
486 " shrl $2, %0\n"
487 " andl $3, %%eax\n"
488 " cld\n"
489 "6: rep; movsl\n"
490 " movl %%eax,%0\n"
491 "7: rep; movsb\n"
492 "8:\n"
493 ".section .fixup,\"ax\"\n"
494 "9: lea 0(%%eax,%0,4),%0\n"
495 "16: pushl %0\n"
496 " pushl %%eax\n"
497 " xorl %%eax,%%eax\n"
498 " rep; stosb\n"
499 " popl %%eax\n"
500 " popl %0\n"
501 " jmp 8b\n"
502 ".previous\n"
503 ".section __ex_table,\"a\"\n"
504 " .align 4\n"
505 " .long 0b,16b\n"
506 " .long 1b,16b\n"
507 " .long 2b,16b\n"
508 " .long 21b,16b\n"
509 " .long 3b,16b\n"
510 " .long 31b,16b\n"
511 " .long 4b,16b\n"
512 " .long 41b,16b\n"
513 " .long 10b,16b\n"
514 " .long 51b,16b\n"
515 " .long 11b,16b\n"
516 " .long 61b,16b\n"
517 " .long 12b,16b\n"
518 " .long 71b,16b\n"
519 " .long 13b,16b\n"
520 " .long 81b,16b\n"
521 " .long 14b,16b\n"
522 " .long 91b,16b\n"
523 " .long 6b,9b\n"
524 " .long 7b,16b\n"
525 ".previous"
526 : "=&c"(size), "=&D" (d0), "=&S" (d1)
527 : "1"(to), "2"(from), "0"(size)
528 : "eax", "edx", "memory");
529 return size;
530}
531
532static unsigned long __copy_user_intel_nocache(void *to,
533 const void __user *from, unsigned long size)
534{
535 int d0, d1;
536
537 __asm__ __volatile__(
538 " .align 2,0x90\n"
539 "0: movl 32(%4), %%eax\n"
540 " cmpl $67, %0\n"
541 " jbe 2f\n"
542 "1: movl 64(%4), %%eax\n"
543 " .align 2,0x90\n"
544 "2: movl 0(%4), %%eax\n"
545 "21: movl 4(%4), %%edx\n"
546 " movnti %%eax, 0(%3)\n"
547 " movnti %%edx, 4(%3)\n"
548 "3: movl 8(%4), %%eax\n"
549 "31: movl 12(%4),%%edx\n"
550 " movnti %%eax, 8(%3)\n"
551 " movnti %%edx, 12(%3)\n"
552 "4: movl 16(%4), %%eax\n"
553 "41: movl 20(%4), %%edx\n"
554 " movnti %%eax, 16(%3)\n"
555 " movnti %%edx, 20(%3)\n"
556 "10: movl 24(%4), %%eax\n"
557 "51: movl 28(%4), %%edx\n"
558 " movnti %%eax, 24(%3)\n"
559 " movnti %%edx, 28(%3)\n"
560 "11: movl 32(%4), %%eax\n"
561 "61: movl 36(%4), %%edx\n"
562 " movnti %%eax, 32(%3)\n"
563 " movnti %%edx, 36(%3)\n"
564 "12: movl 40(%4), %%eax\n"
565 "71: movl 44(%4), %%edx\n"
566 " movnti %%eax, 40(%3)\n"
567 " movnti %%edx, 44(%3)\n"
568 "13: movl 48(%4), %%eax\n"
569 "81: movl 52(%4), %%edx\n"
570 " movnti %%eax, 48(%3)\n"
571 " movnti %%edx, 52(%3)\n"
572 "14: movl 56(%4), %%eax\n"
573 "91: movl 60(%4), %%edx\n"
574 " movnti %%eax, 56(%3)\n"
575 " movnti %%edx, 60(%3)\n"
576 " addl $-64, %0\n"
577 " addl $64, %4\n"
578 " addl $64, %3\n"
579 " cmpl $63, %0\n"
580 " ja 0b\n"
581 " sfence \n"
582 "5: movl %0, %%eax\n"
583 " shrl $2, %0\n"
584 " andl $3, %%eax\n"
585 " cld\n"
586 "6: rep; movsl\n"
587 " movl %%eax,%0\n"
588 "7: rep; movsb\n"
589 "8:\n"
590 ".section .fixup,\"ax\"\n"
591 "9: lea 0(%%eax,%0,4),%0\n"
592 "16: jmp 8b\n"
593 ".previous\n"
594 ".section __ex_table,\"a\"\n"
595 " .align 4\n"
596 " .long 0b,16b\n"
597 " .long 1b,16b\n"
598 " .long 2b,16b\n"
599 " .long 21b,16b\n"
600 " .long 3b,16b\n"
601 " .long 31b,16b\n"
602 " .long 4b,16b\n"
603 " .long 41b,16b\n"
604 " .long 10b,16b\n"
605 " .long 51b,16b\n"
606 " .long 11b,16b\n"
607 " .long 61b,16b\n"
608 " .long 12b,16b\n"
609 " .long 71b,16b\n"
610 " .long 13b,16b\n"
611 " .long 81b,16b\n"
612 " .long 14b,16b\n"
613 " .long 91b,16b\n"
614 " .long 6b,9b\n"
615 " .long 7b,16b\n"
616 ".previous"
617 : "=&c"(size), "=&D" (d0), "=&S" (d1)
618 : "1"(to), "2"(from), "0"(size)
619 : "eax", "edx", "memory");
620 return size;
621}
622
623#else
624
625/*
626 * Leave these declared but undefined. They should not be any references to
627 * them
628 */
629unsigned long __copy_user_zeroing_intel(void *to, const void __user *from,
630 unsigned long size);
631unsigned long __copy_user_intel(void __user *to, const void *from,
632 unsigned long size);
633unsigned long __copy_user_zeroing_intel_nocache(void *to,
634 const void __user *from, unsigned long size);
635#endif /* CONFIG_X86_INTEL_USERCOPY */
636
637/* Generic arbitrary sized copy. */
638#define __copy_user(to,from,size) \
639do { \
640 int __d0, __d1, __d2; \
641 __asm__ __volatile__( \
642 " cmp $7,%0\n" \
643 " jbe 1f\n" \
644 " movl %1,%0\n" \
645 " negl %0\n" \
646 " andl $7,%0\n" \
647 " subl %0,%3\n" \
648 "4: rep; movsb\n" \
649 " movl %3,%0\n" \
650 " shrl $2,%0\n" \
651 " andl $3,%3\n" \
652 " .align 2,0x90\n" \
653 "0: rep; movsl\n" \
654 " movl %3,%0\n" \
655 "1: rep; movsb\n" \
656 "2:\n" \
657 ".section .fixup,\"ax\"\n" \
658 "5: addl %3,%0\n" \
659 " jmp 2b\n" \
660 "3: lea 0(%3,%0,4),%0\n" \
661 " jmp 2b\n" \
662 ".previous\n" \
663 ".section __ex_table,\"a\"\n" \
664 " .align 4\n" \
665 " .long 4b,5b\n" \
666 " .long 0b,3b\n" \
667 " .long 1b,2b\n" \
668 ".previous" \
669 : "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \
670 : "3"(size), "0"(size), "1"(to), "2"(from) \
671 : "memory"); \
672} while (0)
673
674#define __copy_user_zeroing(to,from,size) \
675do { \
676 int __d0, __d1, __d2; \
677 __asm__ __volatile__( \
678 " cmp $7,%0\n" \
679 " jbe 1f\n" \
680 " movl %1,%0\n" \
681 " negl %0\n" \
682 " andl $7,%0\n" \
683 " subl %0,%3\n" \
684 "4: rep; movsb\n" \
685 " movl %3,%0\n" \
686 " shrl $2,%0\n" \
687 " andl $3,%3\n" \
688 " .align 2,0x90\n" \
689 "0: rep; movsl\n" \
690 " movl %3,%0\n" \
691 "1: rep; movsb\n" \
692 "2:\n" \
693 ".section .fixup,\"ax\"\n" \
694 "5: addl %3,%0\n" \
695 " jmp 6f\n" \
696 "3: lea 0(%3,%0,4),%0\n" \
697 "6: pushl %0\n" \
698 " pushl %%eax\n" \
699 " xorl %%eax,%%eax\n" \
700 " rep; stosb\n" \
701 " popl %%eax\n" \
702 " popl %0\n" \
703 " jmp 2b\n" \
704 ".previous\n" \
705 ".section __ex_table,\"a\"\n" \
706 " .align 4\n" \
707 " .long 4b,5b\n" \
708 " .long 0b,3b\n" \
709 " .long 1b,6b\n" \
710 ".previous" \
711 : "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \
712 : "3"(size), "0"(size), "1"(to), "2"(from) \
713 : "memory"); \
714} while (0)
715
716unsigned long __copy_to_user_ll(void __user *to, const void *from,
717 unsigned long n)
718{
719#ifndef CONFIG_X86_WP_WORKS_OK
720 if (unlikely(boot_cpu_data.wp_works_ok == 0) &&
721 ((unsigned long )to) < TASK_SIZE) {
722 /*
723 * When we are in an atomic section (see
724 * mm/filemap.c:file_read_actor), return the full
725 * length to take the slow path.
726 */
727 if (in_atomic())
728 return n;
729
730 /*
731 * CPU does not honor the WP bit when writing
732 * from supervisory mode, and due to preemption or SMP,
733 * the page tables can change at any time.
734 * Do it manually. Manfred <manfred@colorfullife.com>
735 */
736 while (n) {
737 unsigned long offset = ((unsigned long)to)%PAGE_SIZE;
738 unsigned long len = PAGE_SIZE - offset;
739 int retval;
740 struct page *pg;
741 void *maddr;
742
743 if (len > n)
744 len = n;
745
746survive:
747 down_read(&current->mm->mmap_sem);
748 retval = get_user_pages(current, current->mm,
749 (unsigned long )to, 1, 1, 0, &pg, NULL);
750
751 if (retval == -ENOMEM && is_init(current)) {
752 up_read(&current->mm->mmap_sem);
753 congestion_wait(WRITE, HZ/50);
754 goto survive;
755 }
756
757 if (retval != 1) {
758 up_read(&current->mm->mmap_sem);
759 break;
760 }
761
762 maddr = kmap_atomic(pg, KM_USER0);
763 memcpy(maddr + offset, from, len);
764 kunmap_atomic(maddr, KM_USER0);
765 set_page_dirty_lock(pg);
766 put_page(pg);
767 up_read(&current->mm->mmap_sem);
768
769 from += len;
770 to += len;
771 n -= len;
772 }
773 return n;
774 }
775#endif
776 if (movsl_is_ok(to, from, n))
777 __copy_user(to, from, n);
778 else
779 n = __copy_user_intel(to, from, n);
780 return n;
781}
782EXPORT_SYMBOL(__copy_to_user_ll);
783
784unsigned long __copy_from_user_ll(void *to, const void __user *from,
785 unsigned long n)
786{
787 if (movsl_is_ok(to, from, n))
788 __copy_user_zeroing(to, from, n);
789 else
790 n = __copy_user_zeroing_intel(to, from, n);
791 return n;
792}
793EXPORT_SYMBOL(__copy_from_user_ll);
794
795unsigned long __copy_from_user_ll_nozero(void *to, const void __user *from,
796 unsigned long n)
797{
798 if (movsl_is_ok(to, from, n))
799 __copy_user(to, from, n);
800 else
801 n = __copy_user_intel((void __user *)to,
802 (const void *)from, n);
803 return n;
804}
805EXPORT_SYMBOL(__copy_from_user_ll_nozero);
806
807unsigned long __copy_from_user_ll_nocache(void *to, const void __user *from,
808 unsigned long n)
809{
810#ifdef CONFIG_X86_INTEL_USERCOPY
811 if ( n > 64 && cpu_has_xmm2)
812 n = __copy_user_zeroing_intel_nocache(to, from, n);
813 else
814 __copy_user_zeroing(to, from, n);
815#else
816 __copy_user_zeroing(to, from, n);
817#endif
818 return n;
819}
820
821unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *from,
822 unsigned long n)
823{
824#ifdef CONFIG_X86_INTEL_USERCOPY
825 if ( n > 64 && cpu_has_xmm2)
826 n = __copy_user_intel_nocache(to, from, n);
827 else
828 __copy_user(to, from, n);
829#else
830 __copy_user(to, from, n);
831#endif
832 return n;
833}
834
835/**
836 * copy_to_user: - Copy a block of data into user space.
837 * @to: Destination address, in user space.
838 * @from: Source address, in kernel space.
839 * @n: Number of bytes to copy.
840 *
841 * Context: User context only. This function may sleep.
842 *
843 * Copy data from kernel space to user space.
844 *
845 * Returns number of bytes that could not be copied.
846 * On success, this will be zero.
847 */
848unsigned long
849copy_to_user(void __user *to, const void *from, unsigned long n)
850{
851 if (access_ok(VERIFY_WRITE, to, n))
852 n = __copy_to_user(to, from, n);
853 return n;
854}
855EXPORT_SYMBOL(copy_to_user);
856
857/**
858 * copy_from_user: - Copy a block of data from user space.
859 * @to: Destination address, in kernel space.
860 * @from: Source address, in user space.
861 * @n: Number of bytes to copy.
862 *
863 * Context: User context only. This function may sleep.
864 *
865 * Copy data from user space to kernel space.
866 *
867 * Returns number of bytes that could not be copied.
868 * On success, this will be zero.
869 *
870 * If some data could not be copied, this function will pad the copied
871 * data to the requested size using zero bytes.
872 */
873unsigned long
874copy_from_user(void *to, const void __user *from, unsigned long n)
875{
876 if (access_ok(VERIFY_READ, from, n))
877 n = __copy_from_user(to, from, n);
878 else
879 memset(to, 0, n);
880 return n;
881}
882EXPORT_SYMBOL(copy_from_user);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-20 05:24:52 -0500