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x86/speculation/mds: Fix documentation typo
[linux/fpc-iii.git] / arch / powerpc / lib / feature-fixups.c
blobde7861e09b41ced8a4756fe5a58c9ddfffc87799
1 /*
2 * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
3 *
4 * Modifications for ppc64:
5 * Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
6 *
7 * Copyright 2008 Michael Ellerman, IBM Corporation.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 #include <linux/types.h>
16 #include <linux/jump_label.h>
17 #include <linux/kernel.h>
18 #include <linux/string.h>
19 #include <linux/init.h>
20 #include <linux/sched/mm.h>
21 #include <asm/cputable.h>
22 #include <asm/code-patching.h>
23 #include <asm/page.h>
24 #include <asm/sections.h>
25 #include <asm/setup.h>
26 #include <asm/security_features.h>
27 #include <asm/firmware.h>
28
29 struct fixup_entry {
30 unsigned long mask;
31 unsigned long value;
32 long start_off;
33 long end_off;
34 long alt_start_off;
35 long alt_end_off;
36 };
37
38 static unsigned int *calc_addr(struct fixup_entry *fcur, long offset)
39 {
40 /*
41 * We store the offset to the code as a negative offset from
42 * the start of the alt_entry, to support the VDSO. This
43 * routine converts that back into an actual address.
44 */
45 return (unsigned int *)((unsigned long)fcur + offset);
46 }
47
48 static int patch_alt_instruction(unsigned int *src, unsigned int *dest,
49 unsigned int *alt_start, unsigned int *alt_end)
50 {
51 unsigned int instr;
52
53 instr = *src;
54
55 if (instr_is_relative_branch(*src)) {
56 unsigned int *target = (unsigned int *)branch_target(src);
57
58 /* Branch within the section doesn't need translating */
59 if (target < alt_start || target > alt_end) {
60 instr = translate_branch(dest, src);
61 if (!instr)
62 return 1;
63 }
64 }
65
66 raw_patch_instruction(dest, instr);
67
68 return 0;
69 }
70
71 static int patch_feature_section(unsigned long value, struct fixup_entry *fcur)
72 {
73 unsigned int *start, *end, *alt_start, *alt_end, *src, *dest;
74
75 start = calc_addr(fcur, fcur->start_off);
76 end = calc_addr(fcur, fcur->end_off);
77 alt_start = calc_addr(fcur, fcur->alt_start_off);
78 alt_end = calc_addr(fcur, fcur->alt_end_off);
79
80 if ((alt_end - alt_start) > (end - start))
81 return 1;
82
83 if ((value & fcur->mask) == fcur->value)
84 return 0;
85
86 src = alt_start;
87 dest = start;
88
89 for (; src < alt_end; src++, dest++) {
90 if (patch_alt_instruction(src, dest, alt_start, alt_end))
91 return 1;
92 }
93
94 for (; dest < end; dest++)
95 raw_patch_instruction(dest, PPC_INST_NOP);
96
97 return 0;
98 }
99
100 void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end)
101 {
102 struct fixup_entry *fcur, *fend;
103
104 fcur = fixup_start;
105 fend = fixup_end;
106
107 for (; fcur < fend; fcur++) {
108 if (patch_feature_section(value, fcur)) {
109 WARN_ON(1);
110 printk("Unable to patch feature section at %p - %p" \
111 " with %p - %p\n",
112 calc_addr(fcur, fcur->start_off),
113 calc_addr(fcur, fcur->end_off),
114 calc_addr(fcur, fcur->alt_start_off),
115 calc_addr(fcur, fcur->alt_end_off));
116 }
117 }
118 }
119
120 #ifdef CONFIG_PPC_BOOK3S_64
121 void do_stf_entry_barrier_fixups(enum stf_barrier_type types)
122 {
123 unsigned int instrs[3], *dest;
124 long *start, *end;
125 int i;
126
127 start = PTRRELOC(&__start___stf_entry_barrier_fixup),
128 end = PTRRELOC(&__stop___stf_entry_barrier_fixup);
129
130 instrs[0] = 0x60000000; /* nop */
131 instrs[1] = 0x60000000; /* nop */
132 instrs[2] = 0x60000000; /* nop */
133
134 i = 0;
135 if (types & STF_BARRIER_FALLBACK) {
136 instrs[i++] = 0x7d4802a6; /* mflr r10 */
137 instrs[i++] = 0x60000000; /* branch patched below */
138 instrs[i++] = 0x7d4803a6; /* mtlr r10 */
139 } else if (types & STF_BARRIER_EIEIO) {
140 instrs[i++] = 0x7e0006ac; /* eieio + bit 6 hint */
141 } else if (types & STF_BARRIER_SYNC_ORI) {
142 instrs[i++] = 0x7c0004ac; /* hwsync */
143 instrs[i++] = 0xe94d0000; /* ld r10,0(r13) */
144 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
145 }
146
147 for (i = 0; start < end; start++, i++) {
148 dest = (void *)start + *start;
149
150 pr_devel("patching dest %lx\n", (unsigned long)dest);
151
152 patch_instruction(dest, instrs[0]);
153
154 if (types & STF_BARRIER_FALLBACK)
155 patch_branch(dest + 1, (unsigned long)&stf_barrier_fallback,
156 BRANCH_SET_LINK);
157 else
158 patch_instruction(dest + 1, instrs[1]);
159
160 patch_instruction(dest + 2, instrs[2]);
161 }
162
163 printk(KERN_DEBUG "stf-barrier: patched %d entry locations (%s barrier)\n", i,
164 (types == STF_BARRIER_NONE) ? "no" :
165 (types == STF_BARRIER_FALLBACK) ? "fallback" :
166 (types == STF_BARRIER_EIEIO) ? "eieio" :
167 (types == (STF_BARRIER_SYNC_ORI)) ? "hwsync"
168 : "unknown");
169 }
170
171 void do_stf_exit_barrier_fixups(enum stf_barrier_type types)
172 {
173 unsigned int instrs[6], *dest;
174 long *start, *end;
175 int i;
176
177 start = PTRRELOC(&__start___stf_exit_barrier_fixup),
178 end = PTRRELOC(&__stop___stf_exit_barrier_fixup);
179
180 instrs[0] = 0x60000000; /* nop */
181 instrs[1] = 0x60000000; /* nop */
182 instrs[2] = 0x60000000; /* nop */
183 instrs[3] = 0x60000000; /* nop */
184 instrs[4] = 0x60000000; /* nop */
185 instrs[5] = 0x60000000; /* nop */
186
187 i = 0;
188 if (types & STF_BARRIER_FALLBACK || types & STF_BARRIER_SYNC_ORI) {
189 if (cpu_has_feature(CPU_FTR_HVMODE)) {
190 instrs[i++] = 0x7db14ba6; /* mtspr 0x131, r13 (HSPRG1) */
191 instrs[i++] = 0x7db04aa6; /* mfspr r13, 0x130 (HSPRG0) */
192 } else {
193 instrs[i++] = 0x7db243a6; /* mtsprg 2,r13 */
194 instrs[i++] = 0x7db142a6; /* mfsprg r13,1 */
195 }
196 instrs[i++] = 0x7c0004ac; /* hwsync */
197 instrs[i++] = 0xe9ad0000; /* ld r13,0(r13) */
198 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
199 if (cpu_has_feature(CPU_FTR_HVMODE)) {
200 instrs[i++] = 0x7db14aa6; /* mfspr r13, 0x131 (HSPRG1) */
201 } else {
202 instrs[i++] = 0x7db242a6; /* mfsprg r13,2 */
203 }
204 } else if (types & STF_BARRIER_EIEIO) {
205 instrs[i++] = 0x7e0006ac; /* eieio + bit 6 hint */
206 }
207
208 for (i = 0; start < end; start++, i++) {
209 dest = (void *)start + *start;
210
211 pr_devel("patching dest %lx\n", (unsigned long)dest);
212
213 patch_instruction(dest, instrs[0]);
214 patch_instruction(dest + 1, instrs[1]);
215 patch_instruction(dest + 2, instrs[2]);
216 patch_instruction(dest + 3, instrs[3]);
217 patch_instruction(dest + 4, instrs[4]);
218 patch_instruction(dest + 5, instrs[5]);
219 }
220 printk(KERN_DEBUG "stf-barrier: patched %d exit locations (%s barrier)\n", i,
221 (types == STF_BARRIER_NONE) ? "no" :
222 (types == STF_BARRIER_FALLBACK) ? "fallback" :
223 (types == STF_BARRIER_EIEIO) ? "eieio" :
224 (types == (STF_BARRIER_SYNC_ORI)) ? "hwsync"
225 : "unknown");
226 }
227
228
229 void do_stf_barrier_fixups(enum stf_barrier_type types)
230 {
231 do_stf_entry_barrier_fixups(types);
232 do_stf_exit_barrier_fixups(types);
233 }
234
235 void do_rfi_flush_fixups(enum l1d_flush_type types)
236 {
237 unsigned int instrs[3], *dest;
238 long *start, *end;
239 int i;
240
241 start = PTRRELOC(&__start___rfi_flush_fixup),
242 end = PTRRELOC(&__stop___rfi_flush_fixup);
243
244 instrs[0] = 0x60000000; /* nop */
245 instrs[1] = 0x60000000; /* nop */
246 instrs[2] = 0x60000000; /* nop */
247
248 if (types & L1D_FLUSH_FALLBACK)
249 /* b .+16 to fallback flush */
250 instrs[0] = 0x48000010;
251
252 i = 0;
253 if (types & L1D_FLUSH_ORI) {
254 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
255 instrs[i++] = 0x63de0000; /* ori 30,30,0 L1d flush*/
256 }
257
258 if (types & L1D_FLUSH_MTTRIG)
259 instrs[i++] = 0x7c12dba6; /* mtspr TRIG2,r0 (SPR #882) */
260
261 for (i = 0; start < end; start++, i++) {
262 dest = (void *)start + *start;
263
264 pr_devel("patching dest %lx\n", (unsigned long)dest);
265
266 patch_instruction(dest, instrs[0]);
267 patch_instruction(dest + 1, instrs[1]);
268 patch_instruction(dest + 2, instrs[2]);
269 }
270
271 printk(KERN_DEBUG "rfi-flush: patched %d locations (%s flush)\n", i,
272 (types == L1D_FLUSH_NONE) ? "no" :
273 (types == L1D_FLUSH_FALLBACK) ? "fallback displacement" :
274 (types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG)
275 ? "ori+mttrig type"
276 : "ori type" :
277 (types & L1D_FLUSH_MTTRIG) ? "mttrig type"
278 : "unknown");
279 }
280
281 void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end)
282 {
283 unsigned int instr, *dest;
284 long *start, *end;
285 int i;
286
287 start = fixup_start;
288 end = fixup_end;
289
290 instr = 0x60000000; /* nop */
291
292 if (enable) {
293 pr_info("barrier-nospec: using ORI speculation barrier\n");
294 instr = 0x63ff0000; /* ori 31,31,0 speculation barrier */
295 }
296
297 for (i = 0; start < end; start++, i++) {
298 dest = (void *)start + *start;
299
300 pr_devel("patching dest %lx\n", (unsigned long)dest);
301 patch_instruction(dest, instr);
302 }
303
304 printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i);
305 }
306
307 #endif /* CONFIG_PPC_BOOK3S_64 */
308
309 #ifdef CONFIG_PPC_BARRIER_NOSPEC
310 void do_barrier_nospec_fixups(bool enable)
311 {
312 void *start, *end;
313
314 start = PTRRELOC(&__start___barrier_nospec_fixup),
315 end = PTRRELOC(&__stop___barrier_nospec_fixup);
316
317 do_barrier_nospec_fixups_range(enable, start, end);
318 }
319 #endif /* CONFIG_PPC_BARRIER_NOSPEC */
320
321 #ifdef CONFIG_PPC_FSL_BOOK3E
322 void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end)
323 {
324 unsigned int instr[2], *dest;
325 long *start, *end;
326 int i;
327
328 start = fixup_start;
329 end = fixup_end;
330
331 instr[0] = PPC_INST_NOP;
332 instr[1] = PPC_INST_NOP;
333
334 if (enable) {
335 pr_info("barrier-nospec: using isync; sync as speculation barrier\n");
336 instr[0] = PPC_INST_ISYNC;
337 instr[1] = PPC_INST_SYNC;
338 }
339
340 for (i = 0; start < end; start++, i++) {
341 dest = (void *)start + *start;
342
343 pr_devel("patching dest %lx\n", (unsigned long)dest);
344 patch_instruction(dest, instr[0]);
345 patch_instruction(dest + 1, instr[1]);
346 }
347
348 printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i);
349 }
350
351 static void patch_btb_flush_section(long *curr)
352 {
353 unsigned int *start, *end;
354
355 start = (void *)curr + *curr;
356 end = (void *)curr + *(curr + 1);
357 for (; start < end; start++) {
358 pr_devel("patching dest %lx\n", (unsigned long)start);
359 patch_instruction(start, PPC_INST_NOP);
360 }
361 }
362
363 void do_btb_flush_fixups(void)
364 {
365 long *start, *end;
366
367 start = PTRRELOC(&__start__btb_flush_fixup);
368 end = PTRRELOC(&__stop__btb_flush_fixup);
369
370 for (; start < end; start += 2)
371 patch_btb_flush_section(start);
372 }
373 #endif /* CONFIG_PPC_FSL_BOOK3E */
374
375 void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end)
376 {
377 long *start, *end;
378 unsigned int *dest;
379
380 if (!(value & CPU_FTR_LWSYNC))
381 return ;
382
383 start = fixup_start;
384 end = fixup_end;
385
386 for (; start < end; start++) {
387 dest = (void *)start + *start;
388 raw_patch_instruction(dest, PPC_INST_LWSYNC);
389 }
390 }
391
392 static void do_final_fixups(void)
393 {
394 #if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE)
395 int *src, *dest;
396 unsigned long length;
397
398 if (PHYSICAL_START == 0)
399 return;
400
401 src = (int *)(KERNELBASE + PHYSICAL_START);
402 dest = (int *)KERNELBASE;
403 length = (__end_interrupts - _stext) / sizeof(int);
404
405 while (length--) {
406 raw_patch_instruction(dest, *src);
407 src++;
408 dest++;
409 }
410 #endif
411 }
412
413 static unsigned long __initdata saved_cpu_features;
414 static unsigned int __initdata saved_mmu_features;
415 #ifdef CONFIG_PPC64
416 static unsigned long __initdata saved_firmware_features;
417 #endif
418
419 void __init apply_feature_fixups(void)
420 {
421 struct cpu_spec *spec = PTRRELOC(*PTRRELOC(&cur_cpu_spec));
422
423 *PTRRELOC(&saved_cpu_features) = spec->cpu_features;
424 *PTRRELOC(&saved_mmu_features) = spec->mmu_features;
425
426 /*
427 * Apply the CPU-specific and firmware specific fixups to kernel text
428 * (nop out sections not relevant to this CPU or this firmware).
429 */
430 do_feature_fixups(spec->cpu_features,
431 PTRRELOC(&__start___ftr_fixup),
432 PTRRELOC(&__stop___ftr_fixup));
433
434 do_feature_fixups(spec->mmu_features,
435 PTRRELOC(&__start___mmu_ftr_fixup),
436 PTRRELOC(&__stop___mmu_ftr_fixup));
437
438 do_lwsync_fixups(spec->cpu_features,
439 PTRRELOC(&__start___lwsync_fixup),
440 PTRRELOC(&__stop___lwsync_fixup));
441
442 #ifdef CONFIG_PPC64
443 saved_firmware_features = powerpc_firmware_features;
444 do_feature_fixups(powerpc_firmware_features,
445 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
446 #endif
447 do_final_fixups();
448 }
449
450 void __init setup_feature_keys(void)
451 {
452 /*
453 * Initialise jump label. This causes all the cpu/mmu_has_feature()
454 * checks to take on their correct polarity based on the current set of
455 * CPU/MMU features.
456 */
457 jump_label_init();
458 cpu_feature_keys_init();
459 mmu_feature_keys_init();
460 }
461
462 static int __init check_features(void)
463 {
464 WARN(saved_cpu_features != cur_cpu_spec->cpu_features,
465 "CPU features changed after feature patching!\n");
466 WARN(saved_mmu_features != cur_cpu_spec->mmu_features,
467 "MMU features changed after feature patching!\n");
468 #ifdef CONFIG_PPC64
469 WARN(saved_firmware_features != powerpc_firmware_features,
470 "Firmware features changed after feature patching!\n");
471 #endif
472
473 return 0;
474 }
475 late_initcall(check_features);
476
477 #ifdef CONFIG_FTR_FIXUP_SELFTEST
478
479 #define check(x) \
480 if (!(x)) printk("feature-fixups: test failed at line %d\n", __LINE__);
481
482 /* This must be after the text it fixes up, vmlinux.lds.S enforces that atm */
483 static struct fixup_entry fixup;
484
485 static long calc_offset(struct fixup_entry *entry, unsigned int *p)
486 {
487 return (unsigned long)p - (unsigned long)entry;
488 }
489
490 static void test_basic_patching(void)
491 {
492 extern unsigned int ftr_fixup_test1[];
493 extern unsigned int end_ftr_fixup_test1[];
494 extern unsigned int ftr_fixup_test1_orig[];
495 extern unsigned int ftr_fixup_test1_expected[];
496 int size = end_ftr_fixup_test1 - ftr_fixup_test1;
497
498 fixup.value = fixup.mask = 8;
499 fixup.start_off = calc_offset(&fixup, ftr_fixup_test1 + 1);
500 fixup.end_off = calc_offset(&fixup, ftr_fixup_test1 + 2);
501 fixup.alt_start_off = fixup.alt_end_off = 0;
502
503 /* Sanity check */
504 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
505
506 /* Check we don't patch if the value matches */
507 patch_feature_section(8, &fixup);
508 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
509
510 /* Check we do patch if the value doesn't match */
511 patch_feature_section(0, &fixup);
512 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0);
513
514 /* Check we do patch if the mask doesn't match */
515 memcpy(ftr_fixup_test1, ftr_fixup_test1_orig, size);
516 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
517 patch_feature_section(~8, &fixup);
518 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0);
519 }
520
521 static void test_alternative_patching(void)
522 {
523 extern unsigned int ftr_fixup_test2[];
524 extern unsigned int end_ftr_fixup_test2[];
525 extern unsigned int ftr_fixup_test2_orig[];
526 extern unsigned int ftr_fixup_test2_alt[];
527 extern unsigned int ftr_fixup_test2_expected[];
528 int size = end_ftr_fixup_test2 - ftr_fixup_test2;
529
530 fixup.value = fixup.mask = 0xF;
531 fixup.start_off = calc_offset(&fixup, ftr_fixup_test2 + 1);
532 fixup.end_off = calc_offset(&fixup, ftr_fixup_test2 + 2);
533 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test2_alt);
534 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test2_alt + 1);
535
536 /* Sanity check */
537 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
538
539 /* Check we don't patch if the value matches */
540 patch_feature_section(0xF, &fixup);
541 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
542
543 /* Check we do patch if the value doesn't match */
544 patch_feature_section(0, &fixup);
545 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0);
546
547 /* Check we do patch if the mask doesn't match */
548 memcpy(ftr_fixup_test2, ftr_fixup_test2_orig, size);
549 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
550 patch_feature_section(~0xF, &fixup);
551 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0);
552 }
553
554 static void test_alternative_case_too_big(void)
555 {
556 extern unsigned int ftr_fixup_test3[];
557 extern unsigned int end_ftr_fixup_test3[];
558 extern unsigned int ftr_fixup_test3_orig[];
559 extern unsigned int ftr_fixup_test3_alt[];
560 int size = end_ftr_fixup_test3 - ftr_fixup_test3;
561
562 fixup.value = fixup.mask = 0xC;
563 fixup.start_off = calc_offset(&fixup, ftr_fixup_test3 + 1);
564 fixup.end_off = calc_offset(&fixup, ftr_fixup_test3 + 2);
565 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test3_alt);
566 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test3_alt + 2);
567
568 /* Sanity check */
569 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
570
571 /* Expect nothing to be patched, and the error returned to us */
572 check(patch_feature_section(0xF, &fixup) == 1);
573 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
574 check(patch_feature_section(0, &fixup) == 1);
575 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
576 check(patch_feature_section(~0xF, &fixup) == 1);
577 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
578 }
579
580 static void test_alternative_case_too_small(void)
581 {
582 extern unsigned int ftr_fixup_test4[];
583 extern unsigned int end_ftr_fixup_test4[];
584 extern unsigned int ftr_fixup_test4_orig[];
585 extern unsigned int ftr_fixup_test4_alt[];
586 extern unsigned int ftr_fixup_test4_expected[];
587 int size = end_ftr_fixup_test4 - ftr_fixup_test4;
588 unsigned long flag;
589
590 /* Check a high-bit flag */
591 flag = 1UL << ((sizeof(unsigned long) - 1) * 8);
592 fixup.value = fixup.mask = flag;
593 fixup.start_off = calc_offset(&fixup, ftr_fixup_test4 + 1);
594 fixup.end_off = calc_offset(&fixup, ftr_fixup_test4 + 5);
595 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test4_alt);
596 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test4_alt + 2);
597
598 /* Sanity check */
599 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
600
601 /* Check we don't patch if the value matches */
602 patch_feature_section(flag, &fixup);
603 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
604
605 /* Check we do patch if the value doesn't match */
606 patch_feature_section(0, &fixup);
607 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0);
608
609 /* Check we do patch if the mask doesn't match */
610 memcpy(ftr_fixup_test4, ftr_fixup_test4_orig, size);
611 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
612 patch_feature_section(~flag, &fixup);
613 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0);
614 }
615
616 static void test_alternative_case_with_branch(void)
617 {
618 extern unsigned int ftr_fixup_test5[];
619 extern unsigned int end_ftr_fixup_test5[];
620 extern unsigned int ftr_fixup_test5_expected[];
621 int size = end_ftr_fixup_test5 - ftr_fixup_test5;
622
623 check(memcmp(ftr_fixup_test5, ftr_fixup_test5_expected, size) == 0);
624 }
625
626 static void test_alternative_case_with_external_branch(void)
627 {
628 extern unsigned int ftr_fixup_test6[];
629 extern unsigned int end_ftr_fixup_test6[];
630 extern unsigned int ftr_fixup_test6_expected[];
631 int size = end_ftr_fixup_test6 - ftr_fixup_test6;
632
633 check(memcmp(ftr_fixup_test6, ftr_fixup_test6_expected, size) == 0);
634 }
635
636 static void test_cpu_macros(void)
637 {
638 extern u8 ftr_fixup_test_FTR_macros[];
639 extern u8 ftr_fixup_test_FTR_macros_expected[];
640 unsigned long size = ftr_fixup_test_FTR_macros_expected -
641 ftr_fixup_test_FTR_macros;
642
643 /* The fixups have already been done for us during boot */
644 check(memcmp(ftr_fixup_test_FTR_macros,
645 ftr_fixup_test_FTR_macros_expected, size) == 0);
646 }
647
648 static void test_fw_macros(void)
649 {
650 #ifdef CONFIG_PPC64
651 extern u8 ftr_fixup_test_FW_FTR_macros[];
652 extern u8 ftr_fixup_test_FW_FTR_macros_expected[];
653 unsigned long size = ftr_fixup_test_FW_FTR_macros_expected -
654 ftr_fixup_test_FW_FTR_macros;
655
656 /* The fixups have already been done for us during boot */
657 check(memcmp(ftr_fixup_test_FW_FTR_macros,
658 ftr_fixup_test_FW_FTR_macros_expected, size) == 0);
659 #endif
660 }
661
662 static void test_lwsync_macros(void)
663 {
664 extern u8 lwsync_fixup_test[];
665 extern u8 end_lwsync_fixup_test[];
666 extern u8 lwsync_fixup_test_expected_LWSYNC[];
667 extern u8 lwsync_fixup_test_expected_SYNC[];
668 unsigned long size = end_lwsync_fixup_test -
669 lwsync_fixup_test;
670
671 /* The fixups have already been done for us during boot */
672 if (cur_cpu_spec->cpu_features & CPU_FTR_LWSYNC) {
673 check(memcmp(lwsync_fixup_test,
674 lwsync_fixup_test_expected_LWSYNC, size) == 0);
675 } else {
676 check(memcmp(lwsync_fixup_test,
677 lwsync_fixup_test_expected_SYNC, size) == 0);
678 }
679 }
680
681 static int __init test_feature_fixups(void)
682 {
683 printk(KERN_DEBUG "Running feature fixup self-tests ...\n");
684
685 test_basic_patching();
686 test_alternative_patching();
687 test_alternative_case_too_big();
688 test_alternative_case_too_small();
689 test_alternative_case_with_branch();
690 test_alternative_case_with_external_branch();
691 test_cpu_macros();
692 test_fw_macros();
693 test_lwsync_macros();
694
695 return 0;
696 }
697 late_initcall(test_feature_fixups);
698
699 #endif /* CONFIG_FTR_FIXUP_SELFTEST */
Linux with added FPC-III support