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authorDavid Howells <dhowells@redhat.com>2008-02-08 07:19:31 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-08 12:22:30 -0500
commitb920de1b77b72ca9432ac3f97edb26541e65e5dd (patch)
tree40fa9be1470e929c47927dea7eddf184c0204229 /include/asm-mn10300/uaccess.h
parentef3d534754f31fed9c3b976fee1ece1b3bc38282 (diff)
mn10300: add the MN10300/AM33 architecture to the kernel
Add architecture support for the MN10300/AM33 CPUs produced by MEI to the kernel. This patch also adds board support for the ASB2303 with the ASB2308 daughter board, and the ASB2305. The only processor supported is the MN103E010, which is an AM33v2 core plus on-chip devices. [akpm@linux-foundation.org: nuke cvs control strings] Signed-off-by: Masakazu Urade <urade.masakazu@jp.panasonic.com> Signed-off-by: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-mn10300/uaccess.h')
-rw-r--r--include/asm-mn10300/uaccess.h490
1 files changed, 490 insertions, 0 deletions
diff --git a/include/asm-mn10300/uaccess.h b/include/asm-mn10300/uaccess.h
new file mode 100644
index 000000000000..46b9b647f3c3
--- /dev/null
+++ b/include/asm-mn10300/uaccess.h
@@ -0,0 +1,490 @@
1/* MN10300 userspace access functions
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11#ifndef _ASM_UACCESS_H
12#define _ASM_UACCESS_H
13
14/*
15 * User space memory access functions
16 */
17#include <linux/sched.h>
18#include <asm/page.h>
19#include <asm/pgtable.h>
20#include <asm/errno.h>
21
22#define VERIFY_READ 0
23#define VERIFY_WRITE 1
24
25/*
26 * The fs value determines whether argument validity checking should be
27 * performed or not. If get_fs() == USER_DS, checking is performed, with
28 * get_fs() == KERNEL_DS, checking is bypassed.
29 *
30 * For historical reasons, these macros are grossly misnamed.
31 */
32
33#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
34
35#define KERNEL_XDS MAKE_MM_SEG(0xBFFFFFFF)
36#define KERNEL_DS MAKE_MM_SEG(0x9FFFFFFF)
37#define USER_DS MAKE_MM_SEG(TASK_SIZE)
38
39#define get_ds() (KERNEL_DS)
40#define get_fs() (current_thread_info()->addr_limit)
41#define set_fs(x) (current_thread_info()->addr_limit = (x))
42#define __kernel_ds_p() (current_thread_info()->addr_limit.seg == 0x9FFFFFFF)
43
44#define segment_eq(a, b) ((a).seg == (b).seg)
45
46#define __addr_ok(addr) \
47 ((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))
48
49/*
50 * check that a range of addresses falls within the current address limit
51 */
52static inline int ___range_ok(unsigned long addr, unsigned int size)
53{
54 int flag = 1, tmp;
55
56 asm(" add %3,%1 \n" /* set C-flag if addr + size > 4Gb */
57 " bcs 0f \n"
58 " cmp %4,%1 \n" /* jump if addr+size>limit (error) */
59 " bhi 0f \n"
60 " clr %0 \n" /* mark okay */
61 "0: \n"
62 : "=r"(flag), "=&r"(tmp)
63 : "1"(addr), "ir"(size),
64 "r"(current_thread_info()->addr_limit.seg), "0"(flag)
65 : "cc"
66 );
67
68 return flag;
69}
70
71#define __range_ok(addr, size) ___range_ok((unsigned long)(addr), (u32)(size))
72
73#define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0)
74#define __access_ok(addr, size) (__range_ok((addr), (size)) == 0)
75
76static inline int verify_area(int type, const void *addr, unsigned long size)
77{
78 return access_ok(type, addr, size) ? 0 : -EFAULT;
79}
80
81
82/*
83 * The exception table consists of pairs of addresses: the first is the
84 * address of an instruction that is allowed to fault, and the second is
85 * the address at which the program should continue. No registers are
86 * modified, so it is entirely up to the continuation code to figure out
87 * what to do.
88 *
89 * All the routines below use bits of fixup code that are out of line
90 * with the main instruction path. This means when everything is well,
91 * we don't even have to jump over them. Further, they do not intrude
92 * on our cache or tlb entries.
93 */
94
95struct exception_table_entry
96{
97 unsigned long insn, fixup;
98};
99
100/* Returns 0 if exception not found and fixup otherwise. */
101extern int fixup_exception(struct pt_regs *regs);
102
103#define put_user(x, ptr) __put_user_check((x), (ptr), sizeof(*(ptr)))
104#define get_user(x, ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))
105
106/*
107 * The "__xxx" versions do not do address space checking, useful when
108 * doing multiple accesses to the same area (the user has to do the
109 * checks by hand with "access_ok()")
110 */
111#define __put_user(x, ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
112#define __get_user(x, ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
113
114/*
115 * The "xxx_ret" versions return constant specified in third argument, if
116 * something bad happens. These macros can be optimized for the
117 * case of just returning from the function xxx_ret is used.
118 */
119
120#define put_user_ret(x, ptr, ret) \
121 ({ if (put_user((x), (ptr))) return (ret); })
122#define get_user_ret(x, ptr, ret) \
123 ({ if (get_user((x), (ptr))) return (ret); })
124#define __put_user_ret(x, ptr, ret) \
125 ({ if (__put_user((x), (ptr))) return (ret); })
126#define __get_user_ret(x, ptr, ret) \
127 ({ if (__get_user((x), (ptr))) return (ret); })
128
129struct __large_struct { unsigned long buf[100]; };
130#define __m(x) (*(struct __large_struct *)(x))
131
132#define __get_user_nocheck(x, ptr, size) \
133({ \
134 __typeof(*(ptr)) __gu_val; \
135 unsigned long __gu_addr; \
136 int __gu_err; \
137 __gu_addr = (unsigned long) (ptr); \
138 switch (size) { \
139 case 1: __get_user_asm("bu"); break; \
140 case 2: __get_user_asm("hu"); break; \
141 case 4: __get_user_asm("" ); break; \
142 default: __get_user_unknown(); break; \
143 } \
144 x = (__typeof__(*(ptr))) __gu_val; \
145 __gu_err; \
146})
147
148#define __get_user_check(x, ptr, size) \
149({ \
150 __typeof__(*(ptr)) __gu_val; \
151 unsigned long __gu_addr; \
152 int __gu_err; \
153 __gu_addr = (unsigned long) (ptr); \
154 if (likely(__access_ok(__gu_addr,size))) { \
155 switch (size) { \
156 case 1: __get_user_asm("bu"); break; \
157 case 2: __get_user_asm("hu"); break; \
158 case 4: __get_user_asm("" ); break; \
159 default: __get_user_unknown(); break; \
160 } \
161 } \
162 else { \
163 __gu_err = -EFAULT; \
164 __gu_val = 0; \
165 } \
166 x = (__typeof__(*(ptr))) __gu_val; \
167 __gu_err; \
168})
169
170#define __get_user_asm(INSN) \
171({ \
172 asm volatile( \
173 "1:\n" \
174 " mov"INSN" %2,%1\n" \
175 " mov 0,%0\n" \
176 "2:\n" \
177 " .section .fixup,\"ax\"\n" \
178 "3:\n\t" \
179 " mov %3,%0\n" \
180 " jmp 2b\n" \
181 " .previous\n" \
182 " .section __ex_table,\"a\"\n" \
183 " .balign 4\n" \
184 " .long 1b, 3b\n" \
185 " .previous" \
186 : "=&r" (__gu_err), "=&r" (__gu_val) \
187 : "m" (__m(__gu_addr)), "i" (-EFAULT)); \
188})
189
190extern int __get_user_unknown(void);
191
192#define __put_user_nocheck(x, ptr, size) \
193({ \
194 union { \
195 __typeof__(*(ptr)) val; \
196 u32 bits[2]; \
197 } __pu_val; \
198 unsigned long __pu_addr; \
199 int __pu_err; \
200 __pu_val.val = (x); \
201 __pu_addr = (unsigned long) (ptr); \
202 switch (size) { \
203 case 1: __put_user_asm("bu"); break; \
204 case 2: __put_user_asm("hu"); break; \
205 case 4: __put_user_asm("" ); break; \
206 case 8: __put_user_asm8(); break; \
207 default: __pu_err = __put_user_unknown(); break; \
208 } \
209 __pu_err; \
210})
211
212#define __put_user_check(x, ptr, size) \
213({ \
214 union { \
215 __typeof__(*(ptr)) val; \
216 u32 bits[2]; \
217 } __pu_val; \
218 unsigned long __pu_addr; \
219 int __pu_err; \
220 __pu_val.val = (x); \
221 __pu_addr = (unsigned long) (ptr); \
222 if (likely(__access_ok(__pu_addr, size))) { \
223 switch (size) { \
224 case 1: __put_user_asm("bu"); break; \
225 case 2: __put_user_asm("hu"); break; \
226 case 4: __put_user_asm("" ); break; \
227 case 8: __put_user_asm8(); break; \
228 default: __pu_err = __put_user_unknown(); break; \
229 } \
230 } \
231 else { \
232 __pu_err = -EFAULT; \
233 } \
234 __pu_err; \
235})
236
237#define __put_user_asm(INSN) \
238({ \
239 asm volatile( \
240 "1:\n" \
241 " mov"INSN" %1,%2\n" \
242 " mov 0,%0\n" \
243 "2:\n" \
244 " .section .fixup,\"ax\"\n" \
245 "3:\n" \
246 " mov %3,%0\n" \
247 " jmp 2b\n" \
248 " .previous\n" \
249 " .section __ex_table,\"a\"\n" \
250 " .balign 4\n" \
251 " .long 1b, 3b\n" \
252 " .previous" \
253 : "=&r" (__pu_err) \
254 : "r" (__pu_val.val), "m" (__m(__pu_addr)), \
255 "i" (-EFAULT) \
256 ); \
257})
258
259#define __put_user_asm8() \
260({ \
261 asm volatile( \
262 "1: mov %1,%3 \n" \
263 "2: mov %2,%4 \n" \
264 " mov 0,%0 \n" \
265 "3: \n" \
266 " .section .fixup,\"ax\" \n" \
267 "4: \n" \
268 " mov %5,%0 \n" \
269 " jmp 2b \n" \
270 " .previous \n" \
271 " .section __ex_table,\"a\"\n" \
272 " .balign 4 \n" \
273 " .long 1b, 4b \n" \
274 " .long 2b, 4b \n" \
275 " .previous \n" \
276 : "=&r" (__pu_err) \
277 : "r" (__pu_val.bits[0]), "r" (__pu_val.bits[1]), \
278 "m" (__m(__pu_addr)), "m" (__m(__pu_addr+4)), \
279 "i" (-EFAULT) \
280 ); \
281})
282
283extern int __put_user_unknown(void);
284
285
286/*
287 * Copy To/From Userspace
288 */
289/* Generic arbitrary sized copy. */
290#define __copy_user(to, from, size) \
291do { \
292 if (size) { \
293 void *__to = to; \
294 const void *__from = from; \
295 int w; \
296 asm volatile( \
297 "0: movbu (%0),%3;\n" \
298 "1: movbu %3,(%1);\n" \
299 " inc %0;\n" \
300 " inc %1;\n" \
301 " add -1,%2;\n" \
302 " bne 0b;\n" \
303 "2:\n" \
304 " .section .fixup,\"ax\"\n" \
305 "3: jmp 2b\n" \
306 " .previous\n" \
307 " .section __ex_table,\"a\"\n" \
308 " .balign 4\n" \
309 " .long 0b,3b\n" \
310 " .long 1b,3b\n" \
311 " .previous\n" \
312 : "=a"(__from), "=a"(__to), "=r"(size), "=&r"(w)\
313 : "0"(__from), "1"(__to), "2"(size) \
314 : "memory"); \
315 } \
316} while (0)
317
318#define __copy_user_zeroing(to, from, size) \
319do { \
320 if (size) { \
321 void *__to = to; \
322 const void *__from = from; \
323 int w; \
324 asm volatile( \
325 "0: movbu (%0),%3;\n" \
326 "1: movbu %3,(%1);\n" \
327 " inc %0;\n" \
328 " inc %1;\n" \
329 " add -1,%2;\n" \
330 " bne 0b;\n" \
331 "2:\n" \
332 " .section .fixup,\"ax\"\n" \
333 "3:\n" \
334 " mov %2,%0\n" \
335 " clr %3\n" \
336 "4: movbu %3,(%1);\n" \
337 " inc %1;\n" \
338 " add -1,%2;\n" \
339 " bne 4b;\n" \
340 " mov %0,%2\n" \
341 " jmp 2b\n" \
342 " .previous\n" \
343 " .section __ex_table,\"a\"\n" \
344 " .balign 4\n" \
345 " .long 0b,3b\n" \
346 " .long 1b,3b\n" \
347 " .previous\n" \
348 : "=a"(__from), "=a"(__to), "=r"(size), "=&r"(w)\
349 : "0"(__from), "1"(__to), "2"(size) \
350 : "memory"); \
351 } \
352} while (0)
353
354/* We let the __ versions of copy_from/to_user inline, because they're often
355 * used in fast paths and have only a small space overhead.
356 */
357static inline
358unsigned long __generic_copy_from_user_nocheck(void *to, const void *from,
359 unsigned long n)
360{
361 __copy_user_zeroing(to, from, n);
362 return n;
363}
364
365static inline
366unsigned long __generic_copy_to_user_nocheck(void *to, const void *from,
367 unsigned long n)
368{
369 __copy_user(to, from, n);
370 return n;
371}
372
373
374#if 0
375#error don't use - these macros don't increment to & from pointers
376/* Optimize just a little bit when we know the size of the move. */
377#define __constant_copy_user(to, from, size) \
378do { \
379 asm volatile( \
380 " mov %0,a0;\n" \
381 "0: movbu (%1),d3;\n" \
382 "1: movbu d3,(%2);\n" \
383 " add -1,a0;\n" \
384 " bne 0b;\n" \
385 "2:;" \
386 ".section .fixup,\"ax\"\n" \
387 "3: jmp 2b\n" \
388 ".previous\n" \
389 ".section __ex_table,\"a\"\n" \
390 " .balign 4\n" \
391 " .long 0b,3b\n" \
392 " .long 1b,3b\n" \
393 ".previous" \
394 : \
395 : "d"(size), "d"(to), "d"(from) \
396 : "d3", "a0"); \
397} while (0)
398
399/* Optimize just a little bit when we know the size of the move. */
400#define __constant_copy_user_zeroing(to, from, size) \
401do { \
402 asm volatile( \
403 " mov %0,a0;\n" \
404 "0: movbu (%1),d3;\n" \
405 "1: movbu d3,(%2);\n" \
406 " add -1,a0;\n" \
407 " bne 0b;\n" \
408 "2:;" \
409 ".section .fixup,\"ax\"\n" \
410 "3: jmp 2b\n" \
411 ".previous\n" \
412 ".section __ex_table,\"a\"\n" \
413 " .balign 4\n" \
414 " .long 0b,3b\n" \
415 " .long 1b,3b\n" \
416 ".previous" \
417 : \
418 : "d"(size), "d"(to), "d"(from) \
419 : "d3", "a0"); \
420} while (0)
421
422static inline
423unsigned long __constant_copy_to_user(void *to, const void *from,
424 unsigned long n)
425{
426 if (access_ok(VERIFY_WRITE, to, n))
427 __constant_copy_user(to, from, n);
428 return n;
429}
430
431static inline
432unsigned long __constant_copy_from_user(void *to, const void *from,
433 unsigned long n)
434{
435 if (access_ok(VERIFY_READ, from, n))
436 __constant_copy_user_zeroing(to, from, n);
437 return n;
438}
439
440static inline
441unsigned long __constant_copy_to_user_nocheck(void *to, const void *from,
442 unsigned long n)
443{
444 __constant_copy_user(to, from, n);
445 return n;
446}
447
448static inline
449unsigned long __constant_copy_from_user_nocheck(void *to, const void *from,
450 unsigned long n)
451{
452 __constant_copy_user_zeroing(to, from, n);
453 return n;
454}
455#endif
456
457extern unsigned long __generic_copy_to_user(void __user *, const void *,
458 unsigned long);
459extern unsigned long __generic_copy_from_user(void *, const void __user *,
460 unsigned long);
461
462#define __copy_to_user_inatomic(to, from, n) \
463 __generic_copy_to_user_nocheck((to), (from), (n))
464#define __copy_from_user_inatomic(to, from, n) \
465 __generic_copy_from_user_nocheck((to), (from), (n))
466
467#define __copy_to_user(to, from, n) \
468({ \
469 might_sleep(); \
470 __copy_to_user_inatomic((to), (from), (n)); \
471})
472
473#define __copy_from_user(to, from, n) \
474({ \
475 might_sleep(); \
476 __copy_from_user_inatomic((to), (from), (n)); \
477})
478
479
480#define copy_to_user(to, from, n) __generic_copy_to_user((to), (from), (n))
481#define copy_from_user(to, from, n) __generic_copy_from_user((to), (from), (n))
482
483extern long strncpy_from_user(char *dst, const char __user *src, long count);
484extern long __strncpy_from_user(char *dst, const char __user *src, long count);
485extern long strnlen_user(const char __user *str, long n);
486#define strlen_user(str) strnlen_user(str, ~0UL >> 1)
487extern unsigned long clear_user(void __user *mem, unsigned long len);
488extern unsigned long __clear_user(void __user *mem, unsigned long len);
489
490#endif /* _ASM_UACCESS_H */
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