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11#include <linux/types.h>
12#include <linux/jump_label.h>
13#include <linux/kernel.h>
14#include <linux/string.h>
15#include <linux/init.h>
16#include <linux/sched/mm.h>
17#include <asm/cputable.h>
18#include <asm/code-patching.h>
19#include <asm/page.h>
20#include <asm/sections.h>
21#include <asm/setup.h>
22#include <asm/security_features.h>
23#include <asm/firmware.h>
24#include <asm/inst.h>
25
26struct fixup_entry {
27 unsigned long mask;
28 unsigned long value;
29 long start_off;
30 long end_off;
31 long alt_start_off;
32 long alt_end_off;
33};
34
35static struct ppc_inst *calc_addr(struct fixup_entry *fcur, long offset)
36{
37
38
39
40
41
42 return (struct ppc_inst *)((unsigned long)fcur + offset);
43}
44
45static int patch_alt_instruction(struct ppc_inst *src, struct ppc_inst *dest,
46 struct ppc_inst *alt_start, struct ppc_inst *alt_end)
47{
48 int err;
49 struct ppc_inst instr;
50
51 instr = ppc_inst_read(src);
52
53 if (instr_is_relative_branch(*src)) {
54 struct ppc_inst *target = (struct ppc_inst *)branch_target(src);
55
56
57 if (target < alt_start || target > alt_end) {
58 err = translate_branch(&instr, dest, src);
59 if (err)
60 return 1;
61 }
62 }
63
64 raw_patch_instruction(dest, instr);
65
66 return 0;
67}
68
69static int patch_feature_section(unsigned long value, struct fixup_entry *fcur)
70{
71 struct ppc_inst *start, *end, *alt_start, *alt_end, *src, *dest, nop;
72
73 start = calc_addr(fcur, fcur->start_off);
74 end = calc_addr(fcur, fcur->end_off);
75 alt_start = calc_addr(fcur, fcur->alt_start_off);
76 alt_end = calc_addr(fcur, fcur->alt_end_off);
77
78 if ((alt_end - alt_start) > (end - start))
79 return 1;
80
81 if ((value & fcur->mask) == fcur->value)
82 return 0;
83
84 src = alt_start;
85 dest = start;
86
87 for (; src < alt_end; src = ppc_inst_next(src, src),
88 dest = ppc_inst_next(dest, dest)) {
89 if (patch_alt_instruction(src, dest, alt_start, alt_end))
90 return 1;
91 }
92
93 nop = ppc_inst(PPC_INST_NOP);
94 for (; dest < end; dest = ppc_inst_next(dest, &nop))
95 raw_patch_instruction(dest, nop);
96
97 return 0;
98}
99
100void 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
121static 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;
131 instrs[1] = 0x60000000;
132 instrs[2] = 0x60000000;
133
134 i = 0;
135 if (types & STF_BARRIER_FALLBACK) {
136 instrs[i++] = 0x7d4802a6;
137 instrs[i++] = 0x60000000;
138 instrs[i++] = 0x7d4803a6;
139 } else if (types & STF_BARRIER_EIEIO) {
140 instrs[i++] = 0x7e0006ac;
141 } else if (types & STF_BARRIER_SYNC_ORI) {
142 instrs[i++] = 0x7c0004ac;
143 instrs[i++] = 0xe94d0000;
144 instrs[i++] = 0x63ff0000;
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((struct ppc_inst *)dest, ppc_inst(instrs[0]));
153
154 if (types & STF_BARRIER_FALLBACK)
155 patch_branch((struct ppc_inst *)(dest + 1),
156 (unsigned long)&stf_barrier_fallback,
157 BRANCH_SET_LINK);
158 else
159 patch_instruction((struct ppc_inst *)(dest + 1),
160 ppc_inst(instrs[1]));
161
162 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
163 }
164
165 printk(KERN_DEBUG "stf-barrier: patched %d entry locations (%s barrier)\n", i,
166 (types == STF_BARRIER_NONE) ? "no" :
167 (types == STF_BARRIER_FALLBACK) ? "fallback" :
168 (types == STF_BARRIER_EIEIO) ? "eieio" :
169 (types == (STF_BARRIER_SYNC_ORI)) ? "hwsync"
170 : "unknown");
171}
172
173static void do_stf_exit_barrier_fixups(enum stf_barrier_type types)
174{
175 unsigned int instrs[6], *dest;
176 long *start, *end;
177 int i;
178
179 start = PTRRELOC(&__start___stf_exit_barrier_fixup),
180 end = PTRRELOC(&__stop___stf_exit_barrier_fixup);
181
182 instrs[0] = 0x60000000;
183 instrs[1] = 0x60000000;
184 instrs[2] = 0x60000000;
185 instrs[3] = 0x60000000;
186 instrs[4] = 0x60000000;
187 instrs[5] = 0x60000000;
188
189 i = 0;
190 if (types & STF_BARRIER_FALLBACK || types & STF_BARRIER_SYNC_ORI) {
191 if (cpu_has_feature(CPU_FTR_HVMODE)) {
192 instrs[i++] = 0x7db14ba6;
193 instrs[i++] = 0x7db04aa6;
194 } else {
195 instrs[i++] = 0x7db243a6;
196 instrs[i++] = 0x7db142a6;
197 }
198 instrs[i++] = 0x7c0004ac;
199 instrs[i++] = 0xe9ad0000;
200 instrs[i++] = 0x63ff0000;
201 if (cpu_has_feature(CPU_FTR_HVMODE)) {
202 instrs[i++] = 0x7db14aa6;
203 } else {
204 instrs[i++] = 0x7db242a6;
205 }
206 } else if (types & STF_BARRIER_EIEIO) {
207 instrs[i++] = 0x7e0006ac;
208 }
209
210 for (i = 0; start < end; start++, i++) {
211 dest = (void *)start + *start;
212
213 pr_devel("patching dest %lx\n", (unsigned long)dest);
214
215 patch_instruction((struct ppc_inst *)dest, ppc_inst(instrs[0]));
216 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instrs[1]));
217 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
218 patch_instruction((struct ppc_inst *)(dest + 3), ppc_inst(instrs[3]));
219 patch_instruction((struct ppc_inst *)(dest + 4), ppc_inst(instrs[4]));
220 patch_instruction((struct ppc_inst *)(dest + 5), ppc_inst(instrs[5]));
221 }
222 printk(KERN_DEBUG "stf-barrier: patched %d exit locations (%s barrier)\n", i,
223 (types == STF_BARRIER_NONE) ? "no" :
224 (types == STF_BARRIER_FALLBACK) ? "fallback" :
225 (types == STF_BARRIER_EIEIO) ? "eieio" :
226 (types == (STF_BARRIER_SYNC_ORI)) ? "hwsync"
227 : "unknown");
228}
229
230
231void do_stf_barrier_fixups(enum stf_barrier_type types)
232{
233 do_stf_entry_barrier_fixups(types);
234 do_stf_exit_barrier_fixups(types);
235}
236
237void do_rfi_flush_fixups(enum l1d_flush_type types)
238{
239 unsigned int instrs[3], *dest;
240 long *start, *end;
241 int i;
242
243 start = PTRRELOC(&__start___rfi_flush_fixup),
244 end = PTRRELOC(&__stop___rfi_flush_fixup);
245
246 instrs[0] = 0x60000000;
247 instrs[1] = 0x60000000;
248 instrs[2] = 0x60000000;
249
250 if (types & L1D_FLUSH_FALLBACK)
251
252 instrs[0] = 0x48000010;
253
254 i = 0;
255 if (types & L1D_FLUSH_ORI) {
256 instrs[i++] = 0x63ff0000;
257 instrs[i++] = 0x63de0000;
258 }
259
260 if (types & L1D_FLUSH_MTTRIG)
261 instrs[i++] = 0x7c12dba6;
262
263 for (i = 0; start < end; start++, i++) {
264 dest = (void *)start + *start;
265
266 pr_devel("patching dest %lx\n", (unsigned long)dest);
267
268 patch_instruction((struct ppc_inst *)dest, ppc_inst(instrs[0]));
269 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instrs[1]));
270 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
271 }
272
273 printk(KERN_DEBUG "rfi-flush: patched %d locations (%s flush)\n", i,
274 (types == L1D_FLUSH_NONE) ? "no" :
275 (types == L1D_FLUSH_FALLBACK) ? "fallback displacement" :
276 (types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG)
277 ? "ori+mttrig type"
278 : "ori type" :
279 (types & L1D_FLUSH_MTTRIG) ? "mttrig type"
280 : "unknown");
281}
282
283void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end)
284{
285 unsigned int instr, *dest;
286 long *start, *end;
287 int i;
288
289 start = fixup_start;
290 end = fixup_end;
291
292 instr = 0x60000000;
293
294 if (enable) {
295 pr_info("barrier-nospec: using ORI speculation barrier\n");
296 instr = 0x63ff0000;
297 }
298
299 for (i = 0; start < end; start++, i++) {
300 dest = (void *)start + *start;
301
302 pr_devel("patching dest %lx\n", (unsigned long)dest);
303 patch_instruction((struct ppc_inst *)dest, ppc_inst(instr));
304 }
305
306 printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i);
307}
308
309#endif
310
311#ifdef CONFIG_PPC_BARRIER_NOSPEC
312void do_barrier_nospec_fixups(bool enable)
313{
314 void *start, *end;
315
316 start = PTRRELOC(&__start___barrier_nospec_fixup),
317 end = PTRRELOC(&__stop___barrier_nospec_fixup);
318
319 do_barrier_nospec_fixups_range(enable, start, end);
320}
321#endif
322
323#ifdef CONFIG_PPC_FSL_BOOK3E
324void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end)
325{
326 unsigned int instr[2], *dest;
327 long *start, *end;
328 int i;
329
330 start = fixup_start;
331 end = fixup_end;
332
333 instr[0] = PPC_INST_NOP;
334 instr[1] = PPC_INST_NOP;
335
336 if (enable) {
337 pr_info("barrier-nospec: using isync; sync as speculation barrier\n");
338 instr[0] = PPC_INST_ISYNC;
339 instr[1] = PPC_INST_SYNC;
340 }
341
342 for (i = 0; start < end; start++, i++) {
343 dest = (void *)start + *start;
344
345 pr_devel("patching dest %lx\n", (unsigned long)dest);
346 patch_instruction((struct ppc_inst *)dest, ppc_inst(instr[0]));
347 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instr[1]));
348 }
349
350 printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i);
351}
352
353static void patch_btb_flush_section(long *curr)
354{
355 unsigned int *start, *end;
356
357 start = (void *)curr + *curr;
358 end = (void *)curr + *(curr + 1);
359 for (; start < end; start++) {
360 pr_devel("patching dest %lx\n", (unsigned long)start);
361 patch_instruction((struct ppc_inst *)start, ppc_inst(PPC_INST_NOP));
362 }
363}
364
365void do_btb_flush_fixups(void)
366{
367 long *start, *end;
368
369 start = PTRRELOC(&__start__btb_flush_fixup);
370 end = PTRRELOC(&__stop__btb_flush_fixup);
371
372 for (; start < end; start += 2)
373 patch_btb_flush_section(start);
374}
375#endif
376
377void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end)
378{
379 long *start, *end;
380 struct ppc_inst *dest;
381
382 if (!(value & CPU_FTR_LWSYNC))
383 return ;
384
385 start = fixup_start;
386 end = fixup_end;
387
388 for (; start < end; start++) {
389 dest = (void *)start + *start;
390 raw_patch_instruction(dest, ppc_inst(PPC_INST_LWSYNC));
391 }
392}
393
394static void do_final_fixups(void)
395{
396#if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE)
397 struct ppc_inst inst, *src, *dest, *end;
398
399 if (PHYSICAL_START == 0)
400 return;
401
402 src = (struct ppc_inst *)(KERNELBASE + PHYSICAL_START);
403 dest = (struct ppc_inst *)KERNELBASE;
404 end = (void *)src + (__end_interrupts - _stext);
405
406 while (src < end) {
407 inst = ppc_inst_read(src);
408 raw_patch_instruction(dest, inst);
409 src = ppc_inst_next(src, src);
410 dest = ppc_inst_next(dest, dest);
411 }
412#endif
413}
414
415static unsigned long __initdata saved_cpu_features;
416static unsigned int __initdata saved_mmu_features;
417#ifdef CONFIG_PPC64
418static unsigned long __initdata saved_firmware_features;
419#endif
420
421void __init apply_feature_fixups(void)
422{
423 struct cpu_spec *spec = PTRRELOC(*PTRRELOC(&cur_cpu_spec));
424
425 *PTRRELOC(&saved_cpu_features) = spec->cpu_features;
426 *PTRRELOC(&saved_mmu_features) = spec->mmu_features;
427
428
429
430
431
432 do_feature_fixups(spec->cpu_features,
433 PTRRELOC(&__start___ftr_fixup),
434 PTRRELOC(&__stop___ftr_fixup));
435
436 do_feature_fixups(spec->mmu_features,
437 PTRRELOC(&__start___mmu_ftr_fixup),
438 PTRRELOC(&__stop___mmu_ftr_fixup));
439
440 do_lwsync_fixups(spec->cpu_features,
441 PTRRELOC(&__start___lwsync_fixup),
442 PTRRELOC(&__stop___lwsync_fixup));
443
444#ifdef CONFIG_PPC64
445 saved_firmware_features = powerpc_firmware_features;
446 do_feature_fixups(powerpc_firmware_features,
447 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
448#endif
449 do_final_fixups();
450}
451
452void __init setup_feature_keys(void)
453{
454
455
456
457
458
459 jump_label_init();
460 cpu_feature_keys_init();
461 mmu_feature_keys_init();
462}
463
464static int __init check_features(void)
465{
466 WARN(saved_cpu_features != cur_cpu_spec->cpu_features,
467 "CPU features changed after feature patching!\n");
468 WARN(saved_mmu_features != cur_cpu_spec->mmu_features,
469 "MMU features changed after feature patching!\n");
470#ifdef CONFIG_PPC64
471 WARN(saved_firmware_features != powerpc_firmware_features,
472 "Firmware features changed after feature patching!\n");
473#endif
474
475 return 0;
476}
477late_initcall(check_features);
478
479#ifdef CONFIG_FTR_FIXUP_SELFTEST
480
481#define check(x) \
482 if (!(x)) printk("feature-fixups: test failed at line %d\n", __LINE__);
483
484
485static struct fixup_entry fixup;
486
487static long calc_offset(struct fixup_entry *entry, unsigned int *p)
488{
489 return (unsigned long)p - (unsigned long)entry;
490}
491
492static void test_basic_patching(void)
493{
494 extern unsigned int ftr_fixup_test1[];
495 extern unsigned int end_ftr_fixup_test1[];
496 extern unsigned int ftr_fixup_test1_orig[];
497 extern unsigned int ftr_fixup_test1_expected[];
498 int size = 4 * (end_ftr_fixup_test1 - ftr_fixup_test1);
499
500 fixup.value = fixup.mask = 8;
501 fixup.start_off = calc_offset(&fixup, ftr_fixup_test1 + 1);
502 fixup.end_off = calc_offset(&fixup, ftr_fixup_test1 + 2);
503 fixup.alt_start_off = fixup.alt_end_off = 0;
504
505
506 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
507
508
509 patch_feature_section(8, &fixup);
510 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
511
512
513 patch_feature_section(0, &fixup);
514 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0);
515
516
517 memcpy(ftr_fixup_test1, ftr_fixup_test1_orig, size);
518 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
519 patch_feature_section(~8, &fixup);
520 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0);
521}
522
523static void test_alternative_patching(void)
524{
525 extern unsigned int ftr_fixup_test2[];
526 extern unsigned int end_ftr_fixup_test2[];
527 extern unsigned int ftr_fixup_test2_orig[];
528 extern unsigned int ftr_fixup_test2_alt[];
529 extern unsigned int ftr_fixup_test2_expected[];
530 int size = 4 * (end_ftr_fixup_test2 - ftr_fixup_test2);
531
532 fixup.value = fixup.mask = 0xF;
533 fixup.start_off = calc_offset(&fixup, ftr_fixup_test2 + 1);
534 fixup.end_off = calc_offset(&fixup, ftr_fixup_test2 + 2);
535 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test2_alt);
536 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test2_alt + 1);
537
538
539 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
540
541
542 patch_feature_section(0xF, &fixup);
543 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
544
545
546 patch_feature_section(0, &fixup);
547 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0);
548
549
550 memcpy(ftr_fixup_test2, ftr_fixup_test2_orig, size);
551 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
552 patch_feature_section(~0xF, &fixup);
553 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0);
554}
555
556static void test_alternative_case_too_big(void)
557{
558 extern unsigned int ftr_fixup_test3[];
559 extern unsigned int end_ftr_fixup_test3[];
560 extern unsigned int ftr_fixup_test3_orig[];
561 extern unsigned int ftr_fixup_test3_alt[];
562 int size = 4 * (end_ftr_fixup_test3 - ftr_fixup_test3);
563
564 fixup.value = fixup.mask = 0xC;
565 fixup.start_off = calc_offset(&fixup, ftr_fixup_test3 + 1);
566 fixup.end_off = calc_offset(&fixup, ftr_fixup_test3 + 2);
567 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test3_alt);
568 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test3_alt + 2);
569
570
571 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
572
573
574 check(patch_feature_section(0xF, &fixup) == 1);
575 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
576 check(patch_feature_section(0, &fixup) == 1);
577 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
578 check(patch_feature_section(~0xF, &fixup) == 1);
579 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
580}
581
582static void test_alternative_case_too_small(void)
583{
584 extern unsigned int ftr_fixup_test4[];
585 extern unsigned int end_ftr_fixup_test4[];
586 extern unsigned int ftr_fixup_test4_orig[];
587 extern unsigned int ftr_fixup_test4_alt[];
588 extern unsigned int ftr_fixup_test4_expected[];
589 int size = 4 * (end_ftr_fixup_test4 - ftr_fixup_test4);
590 unsigned long flag;
591
592
593 flag = 1UL << ((sizeof(unsigned long) - 1) * 8);
594 fixup.value = fixup.mask = flag;
595 fixup.start_off = calc_offset(&fixup, ftr_fixup_test4 + 1);
596 fixup.end_off = calc_offset(&fixup, ftr_fixup_test4 + 5);
597 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test4_alt);
598 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test4_alt + 2);
599
600
601 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
602
603
604 patch_feature_section(flag, &fixup);
605 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
606
607
608 patch_feature_section(0, &fixup);
609 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0);
610
611
612 memcpy(ftr_fixup_test4, ftr_fixup_test4_orig, size);
613 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
614 patch_feature_section(~flag, &fixup);
615 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0);
616}
617
618static void test_alternative_case_with_branch(void)
619{
620 extern unsigned int ftr_fixup_test5[];
621 extern unsigned int end_ftr_fixup_test5[];
622 extern unsigned int ftr_fixup_test5_expected[];
623 int size = 4 * (end_ftr_fixup_test5 - ftr_fixup_test5);
624
625 check(memcmp(ftr_fixup_test5, ftr_fixup_test5_expected, size) == 0);
626}
627
628static void test_alternative_case_with_external_branch(void)
629{
630 extern unsigned int ftr_fixup_test6[];
631 extern unsigned int end_ftr_fixup_test6[];
632 extern unsigned int ftr_fixup_test6_expected[];
633 int size = 4 * (end_ftr_fixup_test6 - ftr_fixup_test6);
634
635 check(memcmp(ftr_fixup_test6, ftr_fixup_test6_expected, size) == 0);
636}
637
638static void test_alternative_case_with_branch_to_end(void)
639{
640 extern unsigned int ftr_fixup_test7[];
641 extern unsigned int end_ftr_fixup_test7[];
642 extern unsigned int ftr_fixup_test7_expected[];
643 int size = 4 * (end_ftr_fixup_test7 - ftr_fixup_test7);
644
645 check(memcmp(ftr_fixup_test7, ftr_fixup_test7_expected, size) == 0);
646}
647
648static void test_cpu_macros(void)
649{
650 extern u8 ftr_fixup_test_FTR_macros[];
651 extern u8 ftr_fixup_test_FTR_macros_expected[];
652 unsigned long size = ftr_fixup_test_FTR_macros_expected -
653 ftr_fixup_test_FTR_macros;
654
655
656 check(memcmp(ftr_fixup_test_FTR_macros,
657 ftr_fixup_test_FTR_macros_expected, size) == 0);
658}
659
660static void test_fw_macros(void)
661{
662#ifdef CONFIG_PPC64
663 extern u8 ftr_fixup_test_FW_FTR_macros[];
664 extern u8 ftr_fixup_test_FW_FTR_macros_expected[];
665 unsigned long size = ftr_fixup_test_FW_FTR_macros_expected -
666 ftr_fixup_test_FW_FTR_macros;
667
668
669 check(memcmp(ftr_fixup_test_FW_FTR_macros,
670 ftr_fixup_test_FW_FTR_macros_expected, size) == 0);
671#endif
672}
673
674static void test_lwsync_macros(void)
675{
676 extern u8 lwsync_fixup_test[];
677 extern u8 end_lwsync_fixup_test[];
678 extern u8 lwsync_fixup_test_expected_LWSYNC[];
679 extern u8 lwsync_fixup_test_expected_SYNC[];
680 unsigned long size = end_lwsync_fixup_test -
681 lwsync_fixup_test;
682
683
684 if (cur_cpu_spec->cpu_features & CPU_FTR_LWSYNC) {
685 check(memcmp(lwsync_fixup_test,
686 lwsync_fixup_test_expected_LWSYNC, size) == 0);
687 } else {
688 check(memcmp(lwsync_fixup_test,
689 lwsync_fixup_test_expected_SYNC, size) == 0);
690 }
691}
692
693#ifdef CONFIG_PPC64
694static void __init test_prefix_patching(void)
695{
696 extern unsigned int ftr_fixup_prefix1[];
697 extern unsigned int end_ftr_fixup_prefix1[];
698 extern unsigned int ftr_fixup_prefix1_orig[];
699 extern unsigned int ftr_fixup_prefix1_expected[];
700 int size = sizeof(unsigned int) * (end_ftr_fixup_prefix1 - ftr_fixup_prefix1);
701
702 fixup.value = fixup.mask = 8;
703 fixup.start_off = calc_offset(&fixup, ftr_fixup_prefix1 + 1);
704 fixup.end_off = calc_offset(&fixup, ftr_fixup_prefix1 + 3);
705 fixup.alt_start_off = fixup.alt_end_off = 0;
706
707
708 check(memcmp(ftr_fixup_prefix1, ftr_fixup_prefix1_orig, size) == 0);
709
710 patch_feature_section(0, &fixup);
711 check(memcmp(ftr_fixup_prefix1, ftr_fixup_prefix1_expected, size) == 0);
712 check(memcmp(ftr_fixup_prefix1, ftr_fixup_prefix1_orig, size) != 0);
713}
714
715static void __init test_prefix_alt_patching(void)
716{
717 extern unsigned int ftr_fixup_prefix2[];
718 extern unsigned int end_ftr_fixup_prefix2[];
719 extern unsigned int ftr_fixup_prefix2_orig[];
720 extern unsigned int ftr_fixup_prefix2_expected[];
721 extern unsigned int ftr_fixup_prefix2_alt[];
722 int size = sizeof(unsigned int) * (end_ftr_fixup_prefix2 - ftr_fixup_prefix2);
723
724 fixup.value = fixup.mask = 8;
725 fixup.start_off = calc_offset(&fixup, ftr_fixup_prefix2 + 1);
726 fixup.end_off = calc_offset(&fixup, ftr_fixup_prefix2 + 3);
727 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_prefix2_alt);
728 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_prefix2_alt + 2);
729
730 check(memcmp(ftr_fixup_prefix2, ftr_fixup_prefix2_orig, size) == 0);
731
732 patch_feature_section(0, &fixup);
733 check(memcmp(ftr_fixup_prefix2, ftr_fixup_prefix2_expected, size) == 0);
734 check(memcmp(ftr_fixup_prefix2, ftr_fixup_prefix2_orig, size) != 0);
735}
736
737static void __init test_prefix_word_alt_patching(void)
738{
739 extern unsigned int ftr_fixup_prefix3[];
740 extern unsigned int end_ftr_fixup_prefix3[];
741 extern unsigned int ftr_fixup_prefix3_orig[];
742 extern unsigned int ftr_fixup_prefix3_expected[];
743 extern unsigned int ftr_fixup_prefix3_alt[];
744 int size = sizeof(unsigned int) * (end_ftr_fixup_prefix3 - ftr_fixup_prefix3);
745
746 fixup.value = fixup.mask = 8;
747 fixup.start_off = calc_offset(&fixup, ftr_fixup_prefix3 + 1);
748 fixup.end_off = calc_offset(&fixup, ftr_fixup_prefix3 + 4);
749 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_prefix3_alt);
750 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_prefix3_alt + 3);
751
752 check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_orig, size) == 0);
753
754 patch_feature_section(0, &fixup);
755 check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_expected, size) == 0);
756 patch_feature_section(0, &fixup);
757 check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_orig, size) != 0);
758}
759#else
760static inline void test_prefix_patching(void) {}
761static inline void test_prefix_alt_patching(void) {}
762static inline void test_prefix_word_alt_patching(void) {}
763#endif
764
765static int __init test_feature_fixups(void)
766{
767 printk(KERN_DEBUG "Running feature fixup self-tests ...\n");
768
769 test_basic_patching();
770 test_alternative_patching();
771 test_alternative_case_too_big();
772 test_alternative_case_too_small();
773 test_alternative_case_with_branch();
774 test_alternative_case_with_external_branch();
775 test_alternative_case_with_branch_to_end();
776 test_cpu_macros();
777 test_fw_macros();
778 test_lwsync_macros();
779 test_prefix_patching();
780 test_prefix_alt_patching();
781 test_prefix_word_alt_patching();
782
783 return 0;
784}
785late_initcall(test_feature_fixups);
786
787#endif
788