1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
4 *
5 * Modifications for ppc64:
6 * Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
7 *
8 * Copyright 2008 Michael Ellerman, IBM Corporation.
9 */
10
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 <linux/stop_machine.h>
18 #include <asm/cputable.h>
19 #include <asm/code-patching.h>
20 #include <asm/page.h>
21 #include <asm/sections.h>
22 #include <asm/setup.h>
23 #include <asm/security_features.h>
24 #include <asm/firmware.h>
25 #include <asm/inst.h>
26
27 struct fixup_entry {
28 unsigned long mask;
29 unsigned long value;
30 long start_off;
31 long end_off;
32 long alt_start_off;
33 long alt_end_off;
34 };
35
calc_addr(struct fixup_entry * fcur,long offset)36 static struct ppc_inst *calc_addr(struct fixup_entry *fcur, long offset)
37 {
38 /*
39 * We store the offset to the code as a negative offset from
40 * the start of the alt_entry, to support the VDSO. This
41 * routine converts that back into an actual address.
42 */
43 return (struct ppc_inst *)((unsigned long)fcur + offset);
44 }
45
patch_alt_instruction(struct ppc_inst * src,struct ppc_inst * dest,struct ppc_inst * alt_start,struct ppc_inst * alt_end)46 static int patch_alt_instruction(struct ppc_inst *src, struct ppc_inst *dest,
47 struct ppc_inst *alt_start, struct ppc_inst *alt_end)
48 {
49 int err;
50 struct ppc_inst instr;
51
52 instr = ppc_inst_read(src);
53
54 if (instr_is_relative_branch(*src)) {
55 struct ppc_inst *target = (struct ppc_inst *)branch_target(src);
56
57 /* Branch within the section doesn't need translating */
58 if (target < alt_start || target > alt_end) {
59 err = translate_branch(&instr, dest, src);
60 if (err)
61 return 1;
62 }
63 }
64
65 raw_patch_instruction(dest, instr);
66
67 return 0;
68 }
69
patch_feature_section(unsigned long value,struct fixup_entry * fcur)70 static int patch_feature_section(unsigned long value, struct fixup_entry *fcur)
71 {
72 struct ppc_inst *start, *end, *alt_start, *alt_end, *src, *dest, nop;
73
74 start = calc_addr(fcur, fcur->start_off);
75 end = calc_addr(fcur, fcur->end_off);
76 alt_start = calc_addr(fcur, fcur->alt_start_off);
77 alt_end = calc_addr(fcur, fcur->alt_end_off);
78
79 if ((alt_end - alt_start) > (end - start))
80 return 1;
81
82 if ((value & fcur->mask) == fcur->value)
83 return 0;
84
85 src = alt_start;
86 dest = start;
87
88 for (; src < alt_end; src = ppc_inst_next(src, src),
89 dest = ppc_inst_next(dest, dest)) {
90 if (patch_alt_instruction(src, dest, alt_start, alt_end))
91 return 1;
92 }
93
94 nop = ppc_inst(PPC_INST_NOP);
95 for (; dest < end; dest = ppc_inst_next(dest, &nop))
96 raw_patch_instruction(dest, nop);
97
98 return 0;
99 }
100
do_feature_fixups(unsigned long value,void * fixup_start,void * fixup_end)101 void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end)
102 {
103 struct fixup_entry *fcur, *fend;
104
105 fcur = fixup_start;
106 fend = fixup_end;
107
108 for (; fcur < fend; fcur++) {
109 if (patch_feature_section(value, fcur)) {
110 WARN_ON(1);
111 printk("Unable to patch feature section at %p - %p" \
112 " with %p - %p\n",
113 calc_addr(fcur, fcur->start_off),
114 calc_addr(fcur, fcur->end_off),
115 calc_addr(fcur, fcur->alt_start_off),
116 calc_addr(fcur, fcur->alt_end_off));
117 }
118 }
119 }
120
121 #ifdef CONFIG_PPC_BOOK3S_64
do_stf_entry_barrier_fixups(enum stf_barrier_type types)122 static void do_stf_entry_barrier_fixups(enum stf_barrier_type types)
123 {
124 unsigned int instrs[3], *dest;
125 long *start, *end;
126 int i;
127
128 start = PTRRELOC(&__start___stf_entry_barrier_fixup),
129 end = PTRRELOC(&__stop___stf_entry_barrier_fixup);
130
131 instrs[0] = 0x60000000; /* nop */
132 instrs[1] = 0x60000000; /* nop */
133 instrs[2] = 0x60000000; /* nop */
134
135 i = 0;
136 if (types & STF_BARRIER_FALLBACK) {
137 instrs[i++] = 0x7d4802a6; /* mflr r10 */
138 instrs[i++] = 0x60000000; /* branch patched below */
139 instrs[i++] = 0x7d4803a6; /* mtlr r10 */
140 } else if (types & STF_BARRIER_EIEIO) {
141 instrs[i++] = 0x7e0006ac; /* eieio + bit 6 hint */
142 } else if (types & STF_BARRIER_SYNC_ORI) {
143 instrs[i++] = 0x7c0004ac; /* hwsync */
144 instrs[i++] = 0xe94d0000; /* ld r10,0(r13) */
145 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
146 }
147
148 for (i = 0; start < end; start++, i++) {
149 dest = (void *)start + *start;
150
151 pr_devel("patching dest %lx\n", (unsigned long)dest);
152
153 patch_instruction((struct ppc_inst *)dest, ppc_inst(instrs[0]));
154
155 if (types & STF_BARRIER_FALLBACK)
156 patch_branch((struct ppc_inst *)(dest + 1),
157 (unsigned long)&stf_barrier_fallback,
158 BRANCH_SET_LINK);
159 else
160 patch_instruction((struct ppc_inst *)(dest + 1),
161 ppc_inst(instrs[1]));
162
163 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
164 }
165
166 printk(KERN_DEBUG "stf-barrier: patched %d entry locations (%s barrier)\n", i,
167 (types == STF_BARRIER_NONE) ? "no" :
168 (types == STF_BARRIER_FALLBACK) ? "fallback" :
169 (types == STF_BARRIER_EIEIO) ? "eieio" :
170 (types == (STF_BARRIER_SYNC_ORI)) ? "hwsync"
171 : "unknown");
172 }
173
do_stf_exit_barrier_fixups(enum stf_barrier_type types)174 static void do_stf_exit_barrier_fixups(enum stf_barrier_type types)
175 {
176 unsigned int instrs[6], *dest;
177 long *start, *end;
178 int i;
179
180 start = PTRRELOC(&__start___stf_exit_barrier_fixup),
181 end = PTRRELOC(&__stop___stf_exit_barrier_fixup);
182
183 instrs[0] = 0x60000000; /* nop */
184 instrs[1] = 0x60000000; /* nop */
185 instrs[2] = 0x60000000; /* nop */
186 instrs[3] = 0x60000000; /* nop */
187 instrs[4] = 0x60000000; /* nop */
188 instrs[5] = 0x60000000; /* nop */
189
190 i = 0;
191 if (types & STF_BARRIER_FALLBACK || types & STF_BARRIER_SYNC_ORI) {
192 if (cpu_has_feature(CPU_FTR_HVMODE)) {
193 instrs[i++] = 0x7db14ba6; /* mtspr 0x131, r13 (HSPRG1) */
194 instrs[i++] = 0x7db04aa6; /* mfspr r13, 0x130 (HSPRG0) */
195 } else {
196 instrs[i++] = 0x7db243a6; /* mtsprg 2,r13 */
197 instrs[i++] = 0x7db142a6; /* mfsprg r13,1 */
198 }
199 instrs[i++] = 0x7c0004ac; /* hwsync */
200 instrs[i++] = 0xe9ad0000; /* ld r13,0(r13) */
201 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
202 if (cpu_has_feature(CPU_FTR_HVMODE)) {
203 instrs[i++] = 0x7db14aa6; /* mfspr r13, 0x131 (HSPRG1) */
204 } else {
205 instrs[i++] = 0x7db242a6; /* mfsprg r13,2 */
206 }
207 } else if (types & STF_BARRIER_EIEIO) {
208 instrs[i++] = 0x7e0006ac; /* eieio + bit 6 hint */
209 }
210
211 for (i = 0; start < end; start++, i++) {
212 dest = (void *)start + *start;
213
214 pr_devel("patching dest %lx\n", (unsigned long)dest);
215
216 patch_instruction((struct ppc_inst *)dest, ppc_inst(instrs[0]));
217 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instrs[1]));
218 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
219 patch_instruction((struct ppc_inst *)(dest + 3), ppc_inst(instrs[3]));
220 patch_instruction((struct ppc_inst *)(dest + 4), ppc_inst(instrs[4]));
221 patch_instruction((struct ppc_inst *)(dest + 5), ppc_inst(instrs[5]));
222 }
223 printk(KERN_DEBUG "stf-barrier: patched %d exit locations (%s barrier)\n", i,
224 (types == STF_BARRIER_NONE) ? "no" :
225 (types == STF_BARRIER_FALLBACK) ? "fallback" :
226 (types == STF_BARRIER_EIEIO) ? "eieio" :
227 (types == (STF_BARRIER_SYNC_ORI)) ? "hwsync"
228 : "unknown");
229 }
230
__do_stf_barrier_fixups(void * data)231 static int __do_stf_barrier_fixups(void *data)
232 {
233 enum stf_barrier_type *types = data;
234
235 do_stf_entry_barrier_fixups(*types);
236 do_stf_exit_barrier_fixups(*types);
237
238 return 0;
239 }
240
do_stf_barrier_fixups(enum stf_barrier_type types)241 void do_stf_barrier_fixups(enum stf_barrier_type types)
242 {
243 /*
244 * The call to the fallback entry flush, and the fallback/sync-ori exit
245 * flush can not be safely patched in/out while other CPUs are executing
246 * them. So call __do_stf_barrier_fixups() on one CPU while all other CPUs
247 * spin in the stop machine core with interrupts hard disabled.
248 */
249 stop_machine(__do_stf_barrier_fixups, &types, NULL);
250 }
251
do_uaccess_flush_fixups(enum l1d_flush_type types)252 void do_uaccess_flush_fixups(enum l1d_flush_type types)
253 {
254 unsigned int instrs[4], *dest;
255 long *start, *end;
256 int i;
257
258 start = PTRRELOC(&__start___uaccess_flush_fixup);
259 end = PTRRELOC(&__stop___uaccess_flush_fixup);
260
261 instrs[0] = 0x60000000; /* nop */
262 instrs[1] = 0x60000000; /* nop */
263 instrs[2] = 0x60000000; /* nop */
264 instrs[3] = 0x4e800020; /* blr */
265
266 i = 0;
267 if (types == L1D_FLUSH_FALLBACK) {
268 instrs[3] = 0x60000000; /* nop */
269 /* fallthrough to fallback flush */
270 }
271
272 if (types & L1D_FLUSH_ORI) {
273 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
274 instrs[i++] = 0x63de0000; /* ori 30,30,0 L1d flush*/
275 }
276
277 if (types & L1D_FLUSH_MTTRIG)
278 instrs[i++] = 0x7c12dba6; /* mtspr TRIG2,r0 (SPR #882) */
279
280 for (i = 0; start < end; start++, i++) {
281 dest = (void *)start + *start;
282
283 pr_devel("patching dest %lx\n", (unsigned long)dest);
284
285 patch_instruction((struct ppc_inst *)dest, ppc_inst(instrs[0]));
286
287 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instrs[1]));
288 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
289 patch_instruction((struct ppc_inst *)(dest + 3), ppc_inst(instrs[3]));
290 }
291
292 printk(KERN_DEBUG "uaccess-flush: patched %d locations (%s flush)\n", i,
293 (types == L1D_FLUSH_NONE) ? "no" :
294 (types == L1D_FLUSH_FALLBACK) ? "fallback displacement" :
295 (types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG)
296 ? "ori+mttrig type"
297 : "ori type" :
298 (types & L1D_FLUSH_MTTRIG) ? "mttrig type"
299 : "unknown");
300 }
301
__do_entry_flush_fixups(void * data)302 static int __do_entry_flush_fixups(void *data)
303 {
304 enum l1d_flush_type types = *(enum l1d_flush_type *)data;
305 unsigned int instrs[3], *dest;
306 long *start, *end;
307 int i;
308
309 instrs[0] = 0x60000000; /* nop */
310 instrs[1] = 0x60000000; /* nop */
311 instrs[2] = 0x60000000; /* nop */
312
313 i = 0;
314 if (types == L1D_FLUSH_FALLBACK) {
315 instrs[i++] = 0x7d4802a6; /* mflr r10 */
316 instrs[i++] = 0x60000000; /* branch patched below */
317 instrs[i++] = 0x7d4803a6; /* mtlr r10 */
318 }
319
320 if (types & L1D_FLUSH_ORI) {
321 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
322 instrs[i++] = 0x63de0000; /* ori 30,30,0 L1d flush*/
323 }
324
325 if (types & L1D_FLUSH_MTTRIG)
326 instrs[i++] = 0x7c12dba6; /* mtspr TRIG2,r0 (SPR #882) */
327
328 start = PTRRELOC(&__start___entry_flush_fixup);
329 end = PTRRELOC(&__stop___entry_flush_fixup);
330 for (i = 0; start < end; start++, i++) {
331 dest = (void *)start + *start;
332
333 pr_devel("patching dest %lx\n", (unsigned long)dest);
334
335 patch_instruction((struct ppc_inst *)dest, ppc_inst(instrs[0]));
336
337 if (types == L1D_FLUSH_FALLBACK)
338 patch_branch((struct ppc_inst *)(dest + 1), (unsigned long)&entry_flush_fallback,
339 BRANCH_SET_LINK);
340 else
341 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instrs[1]));
342
343 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
344 }
345
346 start = PTRRELOC(&__start___scv_entry_flush_fixup);
347 end = PTRRELOC(&__stop___scv_entry_flush_fixup);
348 for (; start < end; start++, i++) {
349 dest = (void *)start + *start;
350
351 pr_devel("patching dest %lx\n", (unsigned long)dest);
352
353 patch_instruction((struct ppc_inst *)dest, ppc_inst(instrs[0]));
354
355 if (types == L1D_FLUSH_FALLBACK)
356 patch_branch((struct ppc_inst *)(dest + 1), (unsigned long)&scv_entry_flush_fallback,
357 BRANCH_SET_LINK);
358 else
359 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instrs[1]));
360
361 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
362 }
363
364
365 printk(KERN_DEBUG "entry-flush: patched %d locations (%s flush)\n", i,
366 (types == L1D_FLUSH_NONE) ? "no" :
367 (types == L1D_FLUSH_FALLBACK) ? "fallback displacement" :
368 (types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG)
369 ? "ori+mttrig type"
370 : "ori type" :
371 (types & L1D_FLUSH_MTTRIG) ? "mttrig type"
372 : "unknown");
373
374 return 0;
375 }
376
do_entry_flush_fixups(enum l1d_flush_type types)377 void do_entry_flush_fixups(enum l1d_flush_type types)
378 {
379 /*
380 * The call to the fallback flush can not be safely patched in/out while
381 * other CPUs are executing it. So call __do_entry_flush_fixups() on one
382 * CPU while all other CPUs spin in the stop machine core with interrupts
383 * hard disabled.
384 */
385 stop_machine(__do_entry_flush_fixups, &types, NULL);
386 }
387
do_rfi_flush_fixups(enum l1d_flush_type types)388 void do_rfi_flush_fixups(enum l1d_flush_type types)
389 {
390 unsigned int instrs[3], *dest;
391 long *start, *end;
392 int i;
393
394 start = PTRRELOC(&__start___rfi_flush_fixup),
395 end = PTRRELOC(&__stop___rfi_flush_fixup);
396
397 instrs[0] = 0x60000000; /* nop */
398 instrs[1] = 0x60000000; /* nop */
399 instrs[2] = 0x60000000; /* nop */
400
401 if (types & L1D_FLUSH_FALLBACK)
402 /* b .+16 to fallback flush */
403 instrs[0] = 0x48000010;
404
405 i = 0;
406 if (types & L1D_FLUSH_ORI) {
407 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
408 instrs[i++] = 0x63de0000; /* ori 30,30,0 L1d flush*/
409 }
410
411 if (types & L1D_FLUSH_MTTRIG)
412 instrs[i++] = 0x7c12dba6; /* mtspr TRIG2,r0 (SPR #882) */
413
414 for (i = 0; start < end; start++, i++) {
415 dest = (void *)start + *start;
416
417 pr_devel("patching dest %lx\n", (unsigned long)dest);
418
419 patch_instruction((struct ppc_inst *)dest, ppc_inst(instrs[0]));
420 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instrs[1]));
421 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
422 }
423
424 printk(KERN_DEBUG "rfi-flush: patched %d locations (%s flush)\n", i,
425 (types == L1D_FLUSH_NONE) ? "no" :
426 (types == L1D_FLUSH_FALLBACK) ? "fallback displacement" :
427 (types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG)
428 ? "ori+mttrig type"
429 : "ori type" :
430 (types & L1D_FLUSH_MTTRIG) ? "mttrig type"
431 : "unknown");
432 }
433
do_barrier_nospec_fixups_range(bool enable,void * fixup_start,void * fixup_end)434 void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end)
435 {
436 unsigned int instr, *dest;
437 long *start, *end;
438 int i;
439
440 start = fixup_start;
441 end = fixup_end;
442
443 instr = 0x60000000; /* nop */
444
445 if (enable) {
446 pr_info("barrier-nospec: using ORI speculation barrier\n");
447 instr = 0x63ff0000; /* ori 31,31,0 speculation barrier */
448 }
449
450 for (i = 0; start < end; start++, i++) {
451 dest = (void *)start + *start;
452
453 pr_devel("patching dest %lx\n", (unsigned long)dest);
454 patch_instruction((struct ppc_inst *)dest, ppc_inst(instr));
455 }
456
457 printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i);
458 }
459
460 #endif /* CONFIG_PPC_BOOK3S_64 */
461
462 #ifdef CONFIG_PPC_BARRIER_NOSPEC
do_barrier_nospec_fixups(bool enable)463 void do_barrier_nospec_fixups(bool enable)
464 {
465 void *start, *end;
466
467 start = PTRRELOC(&__start___barrier_nospec_fixup),
468 end = PTRRELOC(&__stop___barrier_nospec_fixup);
469
470 do_barrier_nospec_fixups_range(enable, start, end);
471 }
472 #endif /* CONFIG_PPC_BARRIER_NOSPEC */
473
474 #ifdef CONFIG_PPC_FSL_BOOK3E
do_barrier_nospec_fixups_range(bool enable,void * fixup_start,void * fixup_end)475 void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end)
476 {
477 unsigned int instr[2], *dest;
478 long *start, *end;
479 int i;
480
481 start = fixup_start;
482 end = fixup_end;
483
484 instr[0] = PPC_INST_NOP;
485 instr[1] = PPC_INST_NOP;
486
487 if (enable) {
488 pr_info("barrier-nospec: using isync; sync as speculation barrier\n");
489 instr[0] = PPC_INST_ISYNC;
490 instr[1] = PPC_INST_SYNC;
491 }
492
493 for (i = 0; start < end; start++, i++) {
494 dest = (void *)start + *start;
495
496 pr_devel("patching dest %lx\n", (unsigned long)dest);
497 patch_instruction((struct ppc_inst *)dest, ppc_inst(instr[0]));
498 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instr[1]));
499 }
500
501 printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i);
502 }
503
patch_btb_flush_section(long * curr)504 static void patch_btb_flush_section(long *curr)
505 {
506 unsigned int *start, *end;
507
508 start = (void *)curr + *curr;
509 end = (void *)curr + *(curr + 1);
510 for (; start < end; start++) {
511 pr_devel("patching dest %lx\n", (unsigned long)start);
512 patch_instruction((struct ppc_inst *)start, ppc_inst(PPC_INST_NOP));
513 }
514 }
515
do_btb_flush_fixups(void)516 void do_btb_flush_fixups(void)
517 {
518 long *start, *end;
519
520 start = PTRRELOC(&__start__btb_flush_fixup);
521 end = PTRRELOC(&__stop__btb_flush_fixup);
522
523 for (; start < end; start += 2)
524 patch_btb_flush_section(start);
525 }
526 #endif /* CONFIG_PPC_FSL_BOOK3E */
527
do_lwsync_fixups(unsigned long value,void * fixup_start,void * fixup_end)528 void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end)
529 {
530 long *start, *end;
531 struct ppc_inst *dest;
532
533 if (!(value & CPU_FTR_LWSYNC))
534 return ;
535
536 start = fixup_start;
537 end = fixup_end;
538
539 for (; start < end; start++) {
540 dest = (void *)start + *start;
541 raw_patch_instruction(dest, ppc_inst(PPC_INST_LWSYNC));
542 }
543 }
544
do_final_fixups(void)545 static void do_final_fixups(void)
546 {
547 #if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE)
548 struct ppc_inst inst, *src, *dest, *end;
549
550 if (PHYSICAL_START == 0)
551 return;
552
553 src = (struct ppc_inst *)(KERNELBASE + PHYSICAL_START);
554 dest = (struct ppc_inst *)KERNELBASE;
555 end = (void *)src + (__end_interrupts - _stext);
556
557 while (src < end) {
558 inst = ppc_inst_read(src);
559 raw_patch_instruction(dest, inst);
560 src = ppc_inst_next(src, src);
561 dest = ppc_inst_next(dest, dest);
562 }
563 #endif
564 }
565
566 static unsigned long __initdata saved_cpu_features;
567 static unsigned int __initdata saved_mmu_features;
568 #ifdef CONFIG_PPC64
569 static unsigned long __initdata saved_firmware_features;
570 #endif
571
apply_feature_fixups(void)572 void __init apply_feature_fixups(void)
573 {
574 struct cpu_spec *spec = PTRRELOC(*PTRRELOC(&cur_cpu_spec));
575
576 *PTRRELOC(&saved_cpu_features) = spec->cpu_features;
577 *PTRRELOC(&saved_mmu_features) = spec->mmu_features;
578
579 /*
580 * Apply the CPU-specific and firmware specific fixups to kernel text
581 * (nop out sections not relevant to this CPU or this firmware).
582 */
583 do_feature_fixups(spec->cpu_features,
584 PTRRELOC(&__start___ftr_fixup),
585 PTRRELOC(&__stop___ftr_fixup));
586
587 do_feature_fixups(spec->mmu_features,
588 PTRRELOC(&__start___mmu_ftr_fixup),
589 PTRRELOC(&__stop___mmu_ftr_fixup));
590
591 do_lwsync_fixups(spec->cpu_features,
592 PTRRELOC(&__start___lwsync_fixup),
593 PTRRELOC(&__stop___lwsync_fixup));
594
595 #ifdef CONFIG_PPC64
596 saved_firmware_features = powerpc_firmware_features;
597 do_feature_fixups(powerpc_firmware_features,
598 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
599 #endif
600 do_final_fixups();
601 }
602
setup_feature_keys(void)603 void __init setup_feature_keys(void)
604 {
605 /*
606 * Initialise jump label. This causes all the cpu/mmu_has_feature()
607 * checks to take on their correct polarity based on the current set of
608 * CPU/MMU features.
609 */
610 jump_label_init();
611 cpu_feature_keys_init();
612 mmu_feature_keys_init();
613 }
614
check_features(void)615 static int __init check_features(void)
616 {
617 WARN(saved_cpu_features != cur_cpu_spec->cpu_features,
618 "CPU features changed after feature patching!\n");
619 WARN(saved_mmu_features != cur_cpu_spec->mmu_features,
620 "MMU features changed after feature patching!\n");
621 #ifdef CONFIG_PPC64
622 WARN(saved_firmware_features != powerpc_firmware_features,
623 "Firmware features changed after feature patching!\n");
624 #endif
625
626 return 0;
627 }
628 late_initcall(check_features);
629
630 #ifdef CONFIG_FTR_FIXUP_SELFTEST
631
632 #define check(x) \
633 if (!(x)) printk("feature-fixups: test failed at line %d\n", __LINE__);
634
635 /* This must be after the text it fixes up, vmlinux.lds.S enforces that atm */
636 static struct fixup_entry fixup;
637
calc_offset(struct fixup_entry * entry,unsigned int * p)638 static long calc_offset(struct fixup_entry *entry, unsigned int *p)
639 {
640 return (unsigned long)p - (unsigned long)entry;
641 }
642
test_basic_patching(void)643 static void test_basic_patching(void)
644 {
645 extern unsigned int ftr_fixup_test1[];
646 extern unsigned int end_ftr_fixup_test1[];
647 extern unsigned int ftr_fixup_test1_orig[];
648 extern unsigned int ftr_fixup_test1_expected[];
649 int size = 4 * (end_ftr_fixup_test1 - ftr_fixup_test1);
650
651 fixup.value = fixup.mask = 8;
652 fixup.start_off = calc_offset(&fixup, ftr_fixup_test1 + 1);
653 fixup.end_off = calc_offset(&fixup, ftr_fixup_test1 + 2);
654 fixup.alt_start_off = fixup.alt_end_off = 0;
655
656 /* Sanity check */
657 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
658
659 /* Check we don't patch if the value matches */
660 patch_feature_section(8, &fixup);
661 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
662
663 /* Check we do patch if the value doesn't match */
664 patch_feature_section(0, &fixup);
665 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0);
666
667 /* Check we do patch if the mask doesn't match */
668 memcpy(ftr_fixup_test1, ftr_fixup_test1_orig, size);
669 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
670 patch_feature_section(~8, &fixup);
671 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0);
672 }
673
test_alternative_patching(void)674 static void test_alternative_patching(void)
675 {
676 extern unsigned int ftr_fixup_test2[];
677 extern unsigned int end_ftr_fixup_test2[];
678 extern unsigned int ftr_fixup_test2_orig[];
679 extern unsigned int ftr_fixup_test2_alt[];
680 extern unsigned int ftr_fixup_test2_expected[];
681 int size = 4 * (end_ftr_fixup_test2 - ftr_fixup_test2);
682
683 fixup.value = fixup.mask = 0xF;
684 fixup.start_off = calc_offset(&fixup, ftr_fixup_test2 + 1);
685 fixup.end_off = calc_offset(&fixup, ftr_fixup_test2 + 2);
686 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test2_alt);
687 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test2_alt + 1);
688
689 /* Sanity check */
690 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
691
692 /* Check we don't patch if the value matches */
693 patch_feature_section(0xF, &fixup);
694 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
695
696 /* Check we do patch if the value doesn't match */
697 patch_feature_section(0, &fixup);
698 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0);
699
700 /* Check we do patch if the mask doesn't match */
701 memcpy(ftr_fixup_test2, ftr_fixup_test2_orig, size);
702 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
703 patch_feature_section(~0xF, &fixup);
704 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0);
705 }
706
test_alternative_case_too_big(void)707 static void test_alternative_case_too_big(void)
708 {
709 extern unsigned int ftr_fixup_test3[];
710 extern unsigned int end_ftr_fixup_test3[];
711 extern unsigned int ftr_fixup_test3_orig[];
712 extern unsigned int ftr_fixup_test3_alt[];
713 int size = 4 * (end_ftr_fixup_test3 - ftr_fixup_test3);
714
715 fixup.value = fixup.mask = 0xC;
716 fixup.start_off = calc_offset(&fixup, ftr_fixup_test3 + 1);
717 fixup.end_off = calc_offset(&fixup, ftr_fixup_test3 + 2);
718 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test3_alt);
719 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test3_alt + 2);
720
721 /* Sanity check */
722 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
723
724 /* Expect nothing to be patched, and the error returned to us */
725 check(patch_feature_section(0xF, &fixup) == 1);
726 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
727 check(patch_feature_section(0, &fixup) == 1);
728 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
729 check(patch_feature_section(~0xF, &fixup) == 1);
730 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
731 }
732
test_alternative_case_too_small(void)733 static void test_alternative_case_too_small(void)
734 {
735 extern unsigned int ftr_fixup_test4[];
736 extern unsigned int end_ftr_fixup_test4[];
737 extern unsigned int ftr_fixup_test4_orig[];
738 extern unsigned int ftr_fixup_test4_alt[];
739 extern unsigned int ftr_fixup_test4_expected[];
740 int size = 4 * (end_ftr_fixup_test4 - ftr_fixup_test4);
741 unsigned long flag;
742
743 /* Check a high-bit flag */
744 flag = 1UL << ((sizeof(unsigned long) - 1) * 8);
745 fixup.value = fixup.mask = flag;
746 fixup.start_off = calc_offset(&fixup, ftr_fixup_test4 + 1);
747 fixup.end_off = calc_offset(&fixup, ftr_fixup_test4 + 5);
748 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test4_alt);
749 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test4_alt + 2);
750
751 /* Sanity check */
752 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
753
754 /* Check we don't patch if the value matches */
755 patch_feature_section(flag, &fixup);
756 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
757
758 /* Check we do patch if the value doesn't match */
759 patch_feature_section(0, &fixup);
760 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0);
761
762 /* Check we do patch if the mask doesn't match */
763 memcpy(ftr_fixup_test4, ftr_fixup_test4_orig, size);
764 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
765 patch_feature_section(~flag, &fixup);
766 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0);
767 }
768
test_alternative_case_with_branch(void)769 static void test_alternative_case_with_branch(void)
770 {
771 extern unsigned int ftr_fixup_test5[];
772 extern unsigned int end_ftr_fixup_test5[];
773 extern unsigned int ftr_fixup_test5_expected[];
774 int size = 4 * (end_ftr_fixup_test5 - ftr_fixup_test5);
775
776 check(memcmp(ftr_fixup_test5, ftr_fixup_test5_expected, size) == 0);
777 }
778
test_alternative_case_with_external_branch(void)779 static void test_alternative_case_with_external_branch(void)
780 {
781 extern unsigned int ftr_fixup_test6[];
782 extern unsigned int end_ftr_fixup_test6[];
783 extern unsigned int ftr_fixup_test6_expected[];
784 int size = 4 * (end_ftr_fixup_test6 - ftr_fixup_test6);
785
786 check(memcmp(ftr_fixup_test6, ftr_fixup_test6_expected, size) == 0);
787 }
788
test_alternative_case_with_branch_to_end(void)789 static void test_alternative_case_with_branch_to_end(void)
790 {
791 extern unsigned int ftr_fixup_test7[];
792 extern unsigned int end_ftr_fixup_test7[];
793 extern unsigned int ftr_fixup_test7_expected[];
794 int size = 4 * (end_ftr_fixup_test7 - ftr_fixup_test7);
795
796 check(memcmp(ftr_fixup_test7, ftr_fixup_test7_expected, size) == 0);
797 }
798
test_cpu_macros(void)799 static void test_cpu_macros(void)
800 {
801 extern u8 ftr_fixup_test_FTR_macros[];
802 extern u8 ftr_fixup_test_FTR_macros_expected[];
803 unsigned long size = ftr_fixup_test_FTR_macros_expected -
804 ftr_fixup_test_FTR_macros;
805
806 /* The fixups have already been done for us during boot */
807 check(memcmp(ftr_fixup_test_FTR_macros,
808 ftr_fixup_test_FTR_macros_expected, size) == 0);
809 }
810
test_fw_macros(void)811 static void test_fw_macros(void)
812 {
813 #ifdef CONFIG_PPC64
814 extern u8 ftr_fixup_test_FW_FTR_macros[];
815 extern u8 ftr_fixup_test_FW_FTR_macros_expected[];
816 unsigned long size = ftr_fixup_test_FW_FTR_macros_expected -
817 ftr_fixup_test_FW_FTR_macros;
818
819 /* The fixups have already been done for us during boot */
820 check(memcmp(ftr_fixup_test_FW_FTR_macros,
821 ftr_fixup_test_FW_FTR_macros_expected, size) == 0);
822 #endif
823 }
824
test_lwsync_macros(void)825 static void test_lwsync_macros(void)
826 {
827 extern u8 lwsync_fixup_test[];
828 extern u8 end_lwsync_fixup_test[];
829 extern u8 lwsync_fixup_test_expected_LWSYNC[];
830 extern u8 lwsync_fixup_test_expected_SYNC[];
831 unsigned long size = end_lwsync_fixup_test -
832 lwsync_fixup_test;
833
834 /* The fixups have already been done for us during boot */
835 if (cur_cpu_spec->cpu_features & CPU_FTR_LWSYNC) {
836 check(memcmp(lwsync_fixup_test,
837 lwsync_fixup_test_expected_LWSYNC, size) == 0);
838 } else {
839 check(memcmp(lwsync_fixup_test,
840 lwsync_fixup_test_expected_SYNC, size) == 0);
841 }
842 }
843
844 #ifdef CONFIG_PPC64
test_prefix_patching(void)845 static void __init test_prefix_patching(void)
846 {
847 extern unsigned int ftr_fixup_prefix1[];
848 extern unsigned int end_ftr_fixup_prefix1[];
849 extern unsigned int ftr_fixup_prefix1_orig[];
850 extern unsigned int ftr_fixup_prefix1_expected[];
851 int size = sizeof(unsigned int) * (end_ftr_fixup_prefix1 - ftr_fixup_prefix1);
852
853 fixup.value = fixup.mask = 8;
854 fixup.start_off = calc_offset(&fixup, ftr_fixup_prefix1 + 1);
855 fixup.end_off = calc_offset(&fixup, ftr_fixup_prefix1 + 3);
856 fixup.alt_start_off = fixup.alt_end_off = 0;
857
858 /* Sanity check */
859 check(memcmp(ftr_fixup_prefix1, ftr_fixup_prefix1_orig, size) == 0);
860
861 patch_feature_section(0, &fixup);
862 check(memcmp(ftr_fixup_prefix1, ftr_fixup_prefix1_expected, size) == 0);
863 check(memcmp(ftr_fixup_prefix1, ftr_fixup_prefix1_orig, size) != 0);
864 }
865
test_prefix_alt_patching(void)866 static void __init test_prefix_alt_patching(void)
867 {
868 extern unsigned int ftr_fixup_prefix2[];
869 extern unsigned int end_ftr_fixup_prefix2[];
870 extern unsigned int ftr_fixup_prefix2_orig[];
871 extern unsigned int ftr_fixup_prefix2_expected[];
872 extern unsigned int ftr_fixup_prefix2_alt[];
873 int size = sizeof(unsigned int) * (end_ftr_fixup_prefix2 - ftr_fixup_prefix2);
874
875 fixup.value = fixup.mask = 8;
876 fixup.start_off = calc_offset(&fixup, ftr_fixup_prefix2 + 1);
877 fixup.end_off = calc_offset(&fixup, ftr_fixup_prefix2 + 3);
878 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_prefix2_alt);
879 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_prefix2_alt + 2);
880 /* Sanity check */
881 check(memcmp(ftr_fixup_prefix2, ftr_fixup_prefix2_orig, size) == 0);
882
883 patch_feature_section(0, &fixup);
884 check(memcmp(ftr_fixup_prefix2, ftr_fixup_prefix2_expected, size) == 0);
885 check(memcmp(ftr_fixup_prefix2, ftr_fixup_prefix2_orig, size) != 0);
886 }
887
test_prefix_word_alt_patching(void)888 static void __init test_prefix_word_alt_patching(void)
889 {
890 extern unsigned int ftr_fixup_prefix3[];
891 extern unsigned int end_ftr_fixup_prefix3[];
892 extern unsigned int ftr_fixup_prefix3_orig[];
893 extern unsigned int ftr_fixup_prefix3_expected[];
894 extern unsigned int ftr_fixup_prefix3_alt[];
895 int size = sizeof(unsigned int) * (end_ftr_fixup_prefix3 - ftr_fixup_prefix3);
896
897 fixup.value = fixup.mask = 8;
898 fixup.start_off = calc_offset(&fixup, ftr_fixup_prefix3 + 1);
899 fixup.end_off = calc_offset(&fixup, ftr_fixup_prefix3 + 4);
900 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_prefix3_alt);
901 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_prefix3_alt + 3);
902 /* Sanity check */
903 check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_orig, size) == 0);
904
905 patch_feature_section(0, &fixup);
906 check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_expected, size) == 0);
907 patch_feature_section(0, &fixup);
908 check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_orig, size) != 0);
909 }
910 #else
test_prefix_patching(void)911 static inline void test_prefix_patching(void) {}
test_prefix_alt_patching(void)912 static inline void test_prefix_alt_patching(void) {}
test_prefix_word_alt_patching(void)913 static inline void test_prefix_word_alt_patching(void) {}
914 #endif /* CONFIG_PPC64 */
915
test_feature_fixups(void)916 static int __init test_feature_fixups(void)
917 {
918 printk(KERN_DEBUG "Running feature fixup self-tests ...\n");
919
920 test_basic_patching();
921 test_alternative_patching();
922 test_alternative_case_too_big();
923 test_alternative_case_too_small();
924 test_alternative_case_with_branch();
925 test_alternative_case_with_external_branch();
926 test_alternative_case_with_branch_to_end();
927 test_cpu_macros();
928 test_fw_macros();
929 test_lwsync_macros();
930 test_prefix_patching();
931 test_prefix_alt_patching();
932 test_prefix_word_alt_patching();
933
934 return 0;
935 }
936 late_initcall(test_feature_fixups);
937
938 #endif /* CONFIG_FTR_FIXUP_SELFTEST */
939