198a1649 |
1 | /* |
2 | * wARM - exporting ARM processor specific privileged services to userspace |
3 | * kernelspace part |
4 | * |
5 | * Author: GraÅžvydas "notaz" Ignotas |
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 version 2 as |
9 | * published by the Free Software Foundation. |
10 | */ |
11 | |
12 | #include <linux/module.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/proc_fs.h> |
15 | #include <linux/delay.h> |
16 | #include <linux/fs.h> |
198a1649 |
17 | #include <linux/seq_file.h> |
18 | |
8d04105a |
19 | #include <linux/version.h> |
20 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,11) |
21 | #include <linux/uaccess.h> |
22 | #else |
23 | #include <linux/init.h> |
24 | #include <linux/moduleparam.h> |
25 | #include <asm/uaccess.h> |
26 | #define __user |
27 | #define unlocked_ioctl ioctl |
28 | #endif |
29 | |
198a1649 |
30 | #define WARM_CODE |
31 | #include "../warm.h" |
32 | #include "warm_ops.h" |
33 | |
34 | #ifndef CONFIG_PROC_FS |
35 | #error need proc_fs |
36 | #endif |
37 | |
8d04105a |
38 | #define WARM_VER "r2" |
198a1649 |
39 | #define PFX "wARM: " |
40 | |
8d04105a |
41 | #define WARM_INFO(fmt, ...) \ |
42 | if (verbose) \ |
43 | pr_info(PFX fmt, ##__VA_ARGS__) |
44 | |
159a48bb |
45 | #define SECTION_SIZE 0x100000 |
198a1649 |
46 | #define MAX_CACHEOP_RANGE 16384 |
47 | |
48 | /* assume RAM starts at phys addr 0 (this is really machine specific) */ |
49 | #define RAM_PHYS_START 0 |
50 | #define RAM_MAX_SIZE 0x10000000 /* 256M, try to be future proof */ |
51 | |
8d04105a |
52 | /* expected CPU id */ |
53 | #if defined(CONFIG_CPU_ARM926T) |
54 | #define EXPECTED_ID 0x069260 |
55 | #elif defined(CONFIG_CPU_ARM920T) |
56 | #define EXPECTED_ID 0x029200 |
57 | #else |
58 | #error "unsupported CPU" |
59 | #endif |
60 | |
198a1649 |
61 | extern unsigned long max_mapnr; |
62 | |
63 | /* "upper" physical memory, not seen by Linux and to be mmap'ed */ |
64 | static u32 uppermem_start; |
65 | static u32 uppermem_end; |
66 | |
8d04105a |
67 | static int verbose; |
68 | |
198a1649 |
69 | static u32 *get_pgtable(void) |
70 | { |
71 | u32 ttb; |
72 | |
73 | /* get the pointer to the translation table base... */ |
74 | asm ("mrc p15, 0, %0, c2, c0, 0" : "=r"(ttb)); |
75 | |
76 | return __va((ttb) & 0xffffc000); |
77 | } |
78 | |
79 | static int do_set_cb_uppermem(int in_cb, int is_set) |
80 | { |
81 | u32 *pgtable, *cpt; |
82 | int i, j, count = 0; |
83 | int bits = 0; |
84 | |
85 | if (uppermem_end <= uppermem_start) |
86 | return -ENODEV; |
87 | |
88 | if (in_cb & WCB_C_BIT) |
89 | bits |= 8; |
90 | if (in_cb & WCB_B_BIT) |
91 | bits |= 4; |
92 | |
93 | pgtable = get_pgtable(); |
94 | |
95 | for (i = 0; i < 4096; i++) |
96 | { |
8d04105a |
97 | if ((pgtable[i] & 3) != 1) |
98 | /* must be coarse page table */ |
198a1649 |
99 | continue; |
100 | |
101 | cpt = __va(pgtable[i] & 0xfffffc00); |
102 | |
103 | for (j = 0; j < 256; j++) |
104 | { |
105 | u32 addr, entry; |
106 | |
107 | entry = cpt[j]; |
108 | if (!(entry & 3)) |
109 | /* fault */ |
110 | continue; |
111 | |
112 | addr = entry & 0xfffff000; |
113 | if (uppermem_start <= addr && addr < uppermem_end) |
114 | { |
115 | pr_debug(PFX "%s C&B bits %08x\n", |
116 | is_set ? "set" : "clear", entry); |
117 | |
118 | if (is_set) |
119 | entry |= bits; |
120 | else |
121 | entry &= ~bits; |
122 | |
123 | /* need to also set AP bits (so that no faults |
124 | * happen and kernel doesn't touch this after us) */ |
125 | if ((entry & 3) == 3) |
126 | entry |= 0x030; /* tiny page */ |
127 | else |
128 | entry |= 0xff0; |
129 | |
130 | cpt[j] = entry; |
131 | count++; |
132 | } |
133 | } |
134 | } |
135 | |
136 | warm_cop_clean_d(); |
137 | warm_drain_wb_inval_tlb(); |
138 | |
8d04105a |
139 | WARM_INFO("%c%c bit(s) %s for phys %08x-%08x (%d pages)\n", |
198a1649 |
140 | bits & 8 ? 'c' : ' ', bits & 4 ? 'b' : ' ', |
141 | is_set ? "set" : "cleared", |
142 | uppermem_start, uppermem_end - 1, count); |
143 | |
144 | return 0; |
145 | } |
146 | |
147 | static int do_set_cb_virt(int in_cb, int is_set, u32 addr, u32 size) |
148 | { |
149 | int count = 0, bits = 0; |
159a48bb |
150 | u32 desc1, desc2 = 0; |
151 | u32 *pgtable, *cpt = NULL; |
198a1649 |
152 | u32 start, end; |
cc951732 |
153 | u32 mask; |
198a1649 |
154 | |
155 | if (in_cb & WCB_C_BIT) |
156 | bits |= 8; |
157 | if (in_cb & WCB_B_BIT) |
158 | bits |= 4; |
159 | |
cc951732 |
160 | mask = PAGE_SIZE - 1; |
161 | size += addr & mask; |
162 | size = (size + mask) & ~mask; |
198a1649 |
163 | |
164 | addr &= ~(PAGE_SIZE - 1); |
165 | start = addr; |
166 | end = addr + size; |
167 | |
168 | pgtable = get_pgtable(); |
169 | |
159a48bb |
170 | while (addr < end) |
198a1649 |
171 | { |
172 | desc1 = pgtable[addr >> 20]; |
173 | |
159a48bb |
174 | switch (desc1 & 3) { |
175 | case 0: |
176 | printk(KERN_WARNING PFX "address %08x not mapped.\n", addr); |
198a1649 |
177 | return -EINVAL; |
159a48bb |
178 | case 1: |
179 | /* coarse table */ |
180 | cpt = __va(desc1 & 0xfffffc00); |
181 | desc2 = cpt[(addr >> 12) & 0xff]; |
182 | break; |
183 | case 2: |
184 | /* section */ |
185 | if (is_set) |
186 | desc1 |= bits; |
187 | else |
188 | desc1 &= ~bits; |
189 | pgtable[addr >> 20] = desc1; |
190 | addr += SECTION_SIZE; |
191 | count++; |
192 | continue; |
193 | case 3: |
194 | cpt = __va(desc1 & 0xfffff000); |
195 | desc2 = cpt[(addr >> 10) & 0x3ff]; |
196 | break; |
8d04105a |
197 | } |
198a1649 |
198 | |
198a1649 |
199 | |
159a48bb |
200 | if ((desc2 & 3) == 0) { |
201 | printk(KERN_WARNING PFX "address %08x not mapped (%08x)\n", |
202 | addr, desc2); |
198a1649 |
203 | return -EINVAL; |
204 | } |
205 | |
206 | if (is_set) |
207 | desc2 |= bits; |
208 | else |
209 | desc2 &= ~bits; |
198a1649 |
210 | |
159a48bb |
211 | /* this might be bad idea, better let it fault so that Linux does |
212 | * it's accounting, but that will drop CB bits, so keep this |
213 | * for compatibility */ |
214 | if ((desc2 & 3) == 2) |
215 | desc2 |= 0xff0; |
216 | |
217 | switch (desc1 & 3) { |
218 | case 1: |
219 | cpt[(addr >> 12) & 0xff] = desc2; |
220 | break; |
221 | case 3: |
222 | cpt[(addr >> 10) & 0x3ff] = desc2; |
223 | break; |
224 | } |
225 | |
226 | addr += PAGE_SIZE; |
198a1649 |
227 | count++; |
228 | } |
229 | |
230 | warm_cop_clean_d(); |
231 | warm_drain_wb_inval_tlb(); |
232 | |
8d04105a |
233 | WARM_INFO("%c%c bit(s) %s virt %08x-%08x (%d pages)\n", |
198a1649 |
234 | bits & 8 ? 'c' : ' ', bits & 4 ? 'b' : ' ', |
235 | is_set ? "set" : "cleared", start, end - 1, count); |
236 | |
237 | return 0; |
238 | } |
239 | |
240 | static int do_virt2phys(unsigned long *_addr) |
241 | { |
242 | u32 addr = *_addr; |
243 | u32 desc1, desc2; |
244 | u32 *pgtable, *cpt; |
245 | |
246 | pgtable = get_pgtable(); |
247 | desc1 = pgtable[addr >> 20]; |
248 | |
8d04105a |
249 | switch (desc1 & 3) { |
250 | case 1: /* coarse table */ |
251 | cpt = __va(desc1 & 0xfffffc00); |
252 | desc2 = cpt[(addr >> 12) & 0xff]; |
253 | break; |
254 | case 2: /* 1MB section */ |
198a1649 |
255 | *_addr = (desc1 & 0xfff00000) | (addr & 0xfffff); |
256 | return 0; |
8d04105a |
257 | case 3: /* fine table */ |
258 | cpt = __va(desc1 & 0xfffff000); |
259 | desc2 = cpt[(addr >> 10) & 0x3ff]; |
cc951732 |
260 | break; |
8d04105a |
261 | default: |
262 | return -EINVAL; |
198a1649 |
263 | } |
159a48bb |
264 | |
8d04105a |
265 | switch (desc2 & 3) { |
266 | case 1: /* large page */ |
cc951732 |
267 | *_addr = (desc2 & ~0xffff) | (addr & 0xffff); |
8d04105a |
268 | break; |
269 | case 2: /* small page */ |
cc951732 |
270 | *_addr = (desc2 & ~0x0fff) | (addr & 0x0fff); |
8d04105a |
271 | break; |
272 | case 3: /* tiny page */ |
cc951732 |
273 | *_addr = (desc2 & ~0x03ff) | (addr & 0x03ff); |
8d04105a |
274 | break; |
275 | default: |
198a1649 |
276 | return -EINVAL; |
277 | } |
278 | |
198a1649 |
279 | return 0; |
280 | } |
281 | |
282 | static int do_cache_ops_whole(int ops) |
283 | { |
284 | if ((ops & (WOP_D_CLEAN|WOP_D_INVALIDATE)) == (WOP_D_CLEAN|WOP_D_INVALIDATE)) |
285 | warm_cop_clean_inval_d(); |
286 | |
287 | else if (ops & WOP_D_CLEAN) |
288 | warm_cop_clean_d(); |
289 | |
290 | else if (ops & WOP_D_INVALIDATE) { |
291 | printk(KERN_WARNING PFX "invalidate without clean is dangerous!\n"); |
292 | warm_cop_inval_d(); |
293 | } |
294 | |
295 | if (ops & WOP_I_INVALIDATE) |
296 | warm_cop_inval_i(); |
297 | |
298 | warm_cop_drain_wb(); |
299 | return 0; |
300 | } |
301 | |
302 | static int do_cache_ops(int ops, u32 addr, u32 size) |
303 | { |
304 | if (addr & 31) { |
305 | size += addr & 31; |
306 | addr &= ~31; |
307 | } |
308 | |
309 | switch (ops) { |
310 | case WOP_D_CLEAN|WOP_D_INVALIDATE|WOP_I_INVALIDATE: |
311 | warm_cop_r_clean_d_inval_di(addr, size); |
312 | break; |
313 | case WOP_D_CLEAN|WOP_D_INVALIDATE: |
314 | warm_cop_r_clean_d_inval_d(addr, size); |
315 | break; |
316 | case WOP_D_CLEAN|WOP_I_INVALIDATE: |
317 | warm_cop_r_clean_d_inval_i(addr, size); |
318 | break; |
319 | case WOP_D_CLEAN: |
320 | warm_cop_r_clean_d(addr, size); |
321 | break; |
322 | case WOP_D_INVALIDATE|WOP_I_INVALIDATE: |
323 | warm_cop_r_inval_di(addr, size); |
324 | break; |
325 | case WOP_D_INVALIDATE: |
326 | warm_cop_r_inval_d(addr, size); |
327 | break; |
328 | case WOP_I_INVALIDATE: |
329 | warm_cop_r_inval_i(addr, size); |
330 | break; |
331 | default: |
332 | /* only drain wb */ |
333 | break; |
334 | } |
335 | |
336 | warm_cop_drain_wb(); |
337 | return 0; |
338 | } |
339 | |
87956811 |
340 | static int do_map_op(u32 vaddr, u32 paddr, u32 size, int cb, int is_unmap) |
341 | { |
342 | int count = 0, retval = 0; |
343 | u32 pstart, start, end; |
344 | u32 desc1, apcb_bits; |
345 | u32 *pgtable; |
346 | u32 v, mask; |
347 | |
348 | apcb_bits = (3 << 10) | (1 << 5); /* r/w, dom 1 */ |
349 | if (cb & WCB_C_BIT) |
350 | apcb_bits |= 8; |
351 | if (cb & WCB_B_BIT) |
352 | apcb_bits |= 4; |
353 | // spinlock |
354 | |
355 | mask = SECTION_SIZE - 1; |
356 | size = (size + mask) & ~mask; |
357 | |
358 | pstart = paddr; |
359 | start = vaddr; |
360 | end = start + size; |
361 | |
362 | /* check for overflows */ |
363 | if (end - 1 < start) |
364 | return -EINVAL; |
365 | if (pstart + size - 1 < pstart) |
366 | return -EINVAL; |
367 | |
368 | pgtable = get_pgtable(); |
369 | |
370 | for (; vaddr < end; vaddr += SECTION_SIZE, paddr += SECTION_SIZE) |
371 | { |
372 | desc1 = pgtable[vaddr >> 20]; |
373 | |
374 | if (is_unmap) { |
375 | if ((desc1 & 3) != 2) { |
376 | printk(KERN_WARNING PFX "vaddr %08x is not a section? (%08x)\n", |
377 | vaddr, desc1); |
378 | return -EINVAL; |
379 | } |
380 | v = 0; |
381 | } else { |
382 | if ((desc1 & 3) != 0) { |
383 | printk(KERN_WARNING PFX "vaddr %08x already mapped? (%08x)\n", |
384 | vaddr, desc1); |
385 | retval = -EINVAL; |
386 | break; |
387 | } |
388 | v = (paddr & ~mask) | apcb_bits | 0x12; |
389 | } |
390 | |
391 | pgtable[vaddr >> 20] = v; |
392 | count++; |
393 | } |
394 | |
395 | if (retval != 0) { |
396 | /* undo mappings */ |
397 | vaddr = start; |
398 | |
399 | for (; vaddr < end && count > 0; vaddr += SECTION_SIZE, count--) |
400 | pgtable[vaddr >> 20] = 0; |
401 | } |
402 | |
403 | warm_cop_clean_d(); |
404 | warm_drain_wb_inval_tlb(); |
405 | |
406 | if (retval == 0 && !is_unmap) { |
407 | WARM_INFO("mapped %08x to %08x with %c%c bit(s) (%d section(s))\n", |
408 | start, pstart, apcb_bits & 8 ? 'c' : ' ', |
409 | apcb_bits & 4 ? 'b' : ' ', count); |
410 | } |
411 | |
412 | return retval; |
413 | } |
414 | |
8d04105a |
415 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,11) |
198a1649 |
416 | static long warm_ioctl(struct file *file, unsigned int cmd, unsigned long __arg) |
8d04105a |
417 | #else |
418 | static int warm_ioctl(struct inode *inode, struct file *file, |
419 | unsigned int cmd, unsigned long __arg) |
420 | #endif |
198a1649 |
421 | { |
422 | void __user *arg = (void __user *) __arg; |
423 | union { |
424 | struct warm_cache_op wcop; |
425 | struct warm_change_cb ccb; |
87956811 |
426 | struct warm_map_op mop; |
198a1649 |
427 | unsigned long addr; |
428 | } u; |
429 | long ret; |
430 | |
431 | switch (cmd) { |
432 | case WARMC_CACHE_OP: |
433 | if (copy_from_user(&u.wcop, arg, sizeof(u.wcop))) |
434 | return -EFAULT; |
435 | if (u.wcop.ops & ~(WOP_D_CLEAN|WOP_D_INVALIDATE|WOP_I_INVALIDATE)) |
436 | return -EINVAL; |
8d04105a |
437 | if (u.wcop.size == (unsigned long)-1 || |
438 | (u.wcop.size > MAX_CACHEOP_RANGE && !(u.wcop.ops & WOP_D_INVALIDATE))) |
198a1649 |
439 | ret = do_cache_ops_whole(u.wcop.ops); |
440 | else |
441 | ret = do_cache_ops(u.wcop.ops, u.wcop.addr, u.wcop.size); |
442 | break; |
443 | case WARMC_CHANGE_CB: |
444 | if (copy_from_user(&u.ccb, arg, sizeof(u.ccb))) |
445 | return -EFAULT; |
446 | if (u.ccb.cb & ~(WCB_C_BIT|WCB_B_BIT)) |
447 | return -EINVAL; |
448 | if (u.ccb.addr == 0 && u.ccb.size == 0) |
449 | ret = do_set_cb_uppermem(u.ccb.cb, u.ccb.is_set); |
450 | else |
451 | ret = do_set_cb_virt(u.ccb.cb, u.ccb.is_set, u.ccb.addr, u.ccb.size); |
452 | break; |
453 | case WARMC_VIRT2PHYS: |
454 | if (copy_from_user(&u.addr, arg, sizeof(u.addr))) |
455 | return -EFAULT; |
456 | ret = do_virt2phys(&u.addr); |
457 | if (copy_to_user(arg, &u.addr, sizeof(u.addr))) |
458 | return -EFAULT; |
459 | break; |
87956811 |
460 | case WARMC_MMAP: |
461 | if (copy_from_user(&u.mop, arg, sizeof(u.mop))) |
462 | return -EFAULT; |
463 | if (u.mop.cb & ~(WCB_C_BIT|WCB_B_BIT)) |
464 | return -EINVAL; |
465 | ret = do_map_op(u.mop.virt_addr, u.mop.phys_addr, u.mop.size, |
466 | u.mop.cb, u.mop.is_unmap); |
467 | break; |
198a1649 |
468 | default: |
469 | ret = -ENOTTY; |
470 | break; |
471 | } |
472 | |
473 | return ret; |
474 | } |
475 | |
476 | static const char *warm_implementor_name(char code) |
477 | { |
478 | switch (code) { |
479 | case 'A': |
480 | return "ARM"; |
481 | case 'D': |
482 | return "DEC"; |
483 | case 'i': |
484 | return "Intel"; |
485 | case 'M': |
486 | return "Motorola - Freescale"; |
487 | case 'V': |
488 | return "Marvell"; |
489 | } |
490 | return "???"; |
491 | } |
492 | |
493 | static const char *warm_arch_name(int code) |
494 | { |
495 | switch (code) { |
496 | case 1: |
497 | return "4"; |
498 | case 2: |
499 | return "4T"; |
500 | case 3: |
501 | return "5"; |
502 | case 4: |
503 | return "5T"; |
504 | case 5: |
505 | return "5TE"; |
506 | case 6: |
507 | return "5TEJ"; |
508 | case 7: |
509 | return "6"; |
510 | } |
511 | return "?"; |
512 | } |
513 | |
514 | static int warm_cache_size(int code, int m) |
515 | { |
516 | int base = 512; |
517 | if (m) |
518 | base = 768; |
519 | return base << code; |
520 | } |
521 | |
522 | static int warm_cache_assoc(int code, int m) |
523 | { |
524 | int base = 2; |
525 | if (code == 0) |
526 | return m ? 0 : 1; |
527 | if (m) |
528 | base = 3; |
529 | return base << (code - 1); |
530 | } |
531 | |
532 | static int warm_cache_line(int code) |
533 | { |
534 | return 8 << code; |
535 | } |
536 | |
537 | static int warm_seq_show(struct seq_file *seq, void *offset) |
538 | { |
539 | u32 tmp; |
540 | |
541 | seq_printf(seq, "wARM: " WARM_VER "\n"); |
542 | |
543 | /* ID codes */ |
544 | asm ("mrc p15, 0, %0, c0, c0, 0" : "=r"(tmp)); |
545 | seq_printf(seq, "ID: %08x\n", tmp); |
546 | if (tmp & 0x80000) { |
547 | /* revised format, not yet documented */ |
548 | } else if ((tmp & 0xf000) == 0) { |
549 | /* pre-ARM7 */ |
550 | seq_printf(seq, "Architecture: %d\n", |
551 | (tmp & 0xf00) == 0x600 ? 3 : 2); |
552 | seq_printf(seq, "Variant: %d%d0\n", (tmp & 0xf00) >> 8, |
553 | (tmp & 0xf0) >> 4); |
554 | } else { |
555 | seq_printf(seq, "Implementor: %c (%s)\n", tmp >> 24, |
556 | warm_implementor_name(tmp >> 24)); |
557 | if ((tmp & 0xf000) == 7) { |
558 | seq_printf(seq, "Architecture: %s\n", |
559 | tmp & 0x800000 ? "4T" : "3"); |
560 | seq_printf(seq, "Variant: 0x%x\n", (tmp & 0x7f0000) >> 16); |
561 | } else { |
562 | seq_printf(seq, "Architecture: %s\n", |
563 | warm_arch_name((tmp & 0x0f0000) >> 16)); |
564 | seq_printf(seq, "Variant: 0x%x\n", (tmp & 0xf00000) >> 20); |
565 | } |
566 | seq_printf(seq, "Part number: 0x%x\n", (tmp & 0xfff0) >> 4); |
567 | } |
568 | seq_printf(seq, "Revision: 0x%x\n", tmp & 0xf); |
569 | |
570 | /* cache type */ |
571 | asm ("mrc p15, 0, %0, c0, c0, 1" : "=r"(tmp)); |
572 | seq_printf(seq, "Cache ctype: 0x%x\n", (tmp & 0x1e000000) >> 25); |
573 | seq_printf(seq, "Cache unified: %s\n", (tmp & 0x01000000) ? "no" : "yes"); |
574 | seq_printf(seq, "DCache size: %d\n", |
575 | warm_cache_size((tmp >> (6+12)) & 0xf, (tmp >> (2+12)) & 1)); |
576 | seq_printf(seq, "DCache associativity: %d\n", |
577 | warm_cache_assoc((tmp >> (3+12)) & 7, (tmp >> (2+12)) & 1)); |
578 | seq_printf(seq, "DCache line size: %d\n", |
579 | warm_cache_line((tmp >> (0+12)) & 3)); |
580 | seq_printf(seq, "ICache size: %d\n", |
581 | warm_cache_size((tmp >> 6) & 0xf, (tmp >> 2) & 1)); |
582 | seq_printf(seq, "ICache associativity: %d\n", |
583 | warm_cache_assoc((tmp >> 3) & 7, (tmp >> 2) & 1)); |
584 | seq_printf(seq, "ICache line size: %d\n", |
585 | warm_cache_line((tmp >> 0) & 3)); |
586 | |
587 | return 0; |
588 | } |
589 | |
590 | static int warm_open(struct inode *inode, struct file *file) |
591 | { |
592 | return single_open(file, warm_seq_show, NULL); |
593 | } |
594 | |
595 | static int warm_close(struct inode *ino, struct file *file) |
596 | { |
597 | return single_release(ino, file); |
598 | } |
599 | |
600 | static const struct file_operations warm_fops = { |
601 | .owner = THIS_MODULE, |
602 | .open = warm_open, |
603 | .read = seq_read, |
604 | .llseek = seq_lseek, |
605 | .unlocked_ioctl = warm_ioctl, |
606 | .release = warm_close, |
607 | }; |
608 | |
609 | static int __init warm_module_init(void) |
610 | { |
611 | struct proc_dir_entry *pret; |
8d04105a |
612 | u32 cpuid; |
613 | |
614 | asm ("mrc p15, 0, %0, c0, c0, 0" : "=r"(cpuid)); |
615 | if ((cpuid & 0x0ffff0) != EXPECTED_ID) { |
616 | printk(KERN_ERR PFX "module was compiled for different CPU, aborting\n"); |
617 | return -1; |
618 | } |
198a1649 |
619 | |
620 | pret = create_proc_entry("warm", S_IWUGO | S_IRUGO, NULL); |
621 | if (!pret) { |
622 | printk(KERN_ERR PFX "can't create proc entry\n"); |
623 | return -1; |
624 | } |
625 | |
626 | pret->owner = THIS_MODULE; |
627 | pret->proc_fops = &warm_fops; |
628 | |
629 | uppermem_start = RAM_PHYS_START + (max_mapnr << PAGE_SHIFT); |
630 | uppermem_end = RAM_PHYS_START + RAM_MAX_SIZE; |
631 | |
632 | pr_info(PFX WARM_VER " loaded, "); |
633 | if (uppermem_end <= uppermem_start) |
634 | printk("no upper mem"); |
635 | else |
636 | printk("upper mem %08x-%08x", uppermem_start, uppermem_end - 1); |
637 | printk("\n"); |
638 | |
639 | /* give time for /proc node to appear */ |
640 | mdelay(200); |
641 | |
642 | return 0; |
643 | } |
644 | |
645 | static void __exit warm_module_exit(void) |
646 | { |
647 | remove_proc_entry("warm", NULL); |
648 | |
649 | pr_info(PFX "unloaded.\n"); |
650 | } |
651 | |
652 | module_init(warm_module_init); |
653 | module_exit(warm_module_exit); |
654 | |
8d04105a |
655 | module_param(verbose, int, 0644); |
656 | |
198a1649 |
657 | MODULE_LICENSE("GPL"); |
658 | MODULE_DESCRIPTION("ARM processor services"); |
659 | MODULE_AUTHOR("Grazvydas Ignotas"); |