1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
5 * Modifications for ppc64:
6 * Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
8 * Copyright 2008 Michael Ellerman, IBM Corporation.
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>
20 #include <asm/sections.h>
21 #include <asm/setup.h>
22 #include <asm/security_features.h>
23 #include <asm/firmware.h>
35 static struct ppc_inst *calc_addr(struct fixup_entry *fcur, long offset)
38 * We store the offset to the code as a negative offset from
39 * the start of the alt_entry, to support the VDSO. This
40 * routine converts that back into an actual address.
42 return (struct ppc_inst *)((unsigned long)fcur + offset);
45 static int patch_alt_instruction(struct ppc_inst *src, struct ppc_inst *dest,
46 struct ppc_inst *alt_start, struct ppc_inst *alt_end)
49 struct ppc_inst instr;
51 instr = ppc_inst_read(src);
53 if (instr_is_relative_branch(*src)) {
54 struct ppc_inst *target = (struct ppc_inst *)branch_target(src);
56 /* Branch within the section doesn't need translating */
57 if (target < alt_start || target > alt_end) {
58 err = translate_branch(&instr, dest, src);
64 raw_patch_instruction(dest, instr);
69 static int patch_feature_section(unsigned long value, struct fixup_entry *fcur)
71 struct ppc_inst *start, *end, *alt_start, *alt_end, *src, *dest, nop;
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);
78 if ((alt_end - alt_start) > (end - start))
81 if ((value & fcur->mask) == fcur->value)
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))
93 nop = ppc_inst(PPC_INST_NOP);
94 for (; dest < end; dest = ppc_inst_next(dest, &nop))
95 raw_patch_instruction(dest, nop);
100 void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end)
102 struct fixup_entry *fcur, *fend;
107 for (; fcur < fend; fcur++) {
108 if (patch_feature_section(value, fcur)) {
110 printk("Unable to patch feature section at %p - %p" \
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));
120 #ifdef CONFIG_PPC_BOOK3S_64
121 static void do_stf_entry_barrier_fixups(enum stf_barrier_type types)
123 unsigned int instrs[3], *dest;
127 start = PTRRELOC(&__start___stf_entry_barrier_fixup),
128 end = PTRRELOC(&__stop___stf_entry_barrier_fixup);
130 instrs[0] = 0x60000000; /* nop */
131 instrs[1] = 0x60000000; /* nop */
132 instrs[2] = 0x60000000; /* nop */
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 */
147 for (i = 0; start < end; start++, i++) {
148 dest = (void *)start + *start;
150 pr_devel("patching dest %lx\n", (unsigned long)dest);
152 patch_instruction((struct ppc_inst *)dest, ppc_inst(instrs[0]));
154 if (types & STF_BARRIER_FALLBACK)
155 patch_branch((struct ppc_inst *)(dest + 1),
156 (unsigned long)&stf_barrier_fallback,
159 patch_instruction((struct ppc_inst *)(dest + 1),
160 ppc_inst(instrs[1]));
162 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
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"
173 static void do_stf_exit_barrier_fixups(enum stf_barrier_type types)
175 unsigned int instrs[6], *dest;
179 start = PTRRELOC(&__start___stf_exit_barrier_fixup),
180 end = PTRRELOC(&__stop___stf_exit_barrier_fixup);
182 instrs[0] = 0x60000000; /* nop */
183 instrs[1] = 0x60000000; /* nop */
184 instrs[2] = 0x60000000; /* nop */
185 instrs[3] = 0x60000000; /* nop */
186 instrs[4] = 0x60000000; /* nop */
187 instrs[5] = 0x60000000; /* nop */
190 if (types & STF_BARRIER_FALLBACK || types & STF_BARRIER_SYNC_ORI) {
191 if (cpu_has_feature(CPU_FTR_HVMODE)) {
192 instrs[i++] = 0x7db14ba6; /* mtspr 0x131, r13 (HSPRG1) */
193 instrs[i++] = 0x7db04aa6; /* mfspr r13, 0x130 (HSPRG0) */
195 instrs[i++] = 0x7db243a6; /* mtsprg 2,r13 */
196 instrs[i++] = 0x7db142a6; /* mfsprg r13,1 */
198 instrs[i++] = 0x7c0004ac; /* hwsync */
199 instrs[i++] = 0xe9ad0000; /* ld r13,0(r13) */
200 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
201 if (cpu_has_feature(CPU_FTR_HVMODE)) {
202 instrs[i++] = 0x7db14aa6; /* mfspr r13, 0x131 (HSPRG1) */
204 instrs[i++] = 0x7db242a6; /* mfsprg r13,2 */
206 } else if (types & STF_BARRIER_EIEIO) {
207 instrs[i++] = 0x7e0006ac; /* eieio + bit 6 hint */
210 for (i = 0; start < end; start++, i++) {
211 dest = (void *)start + *start;
213 pr_devel("patching dest %lx\n", (unsigned long)dest);
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]));
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"
231 void do_stf_barrier_fixups(enum stf_barrier_type types)
233 do_stf_entry_barrier_fixups(types);
234 do_stf_exit_barrier_fixups(types);
237 void do_rfi_flush_fixups(enum l1d_flush_type types)
239 unsigned int instrs[3], *dest;
243 start = PTRRELOC(&__start___rfi_flush_fixup),
244 end = PTRRELOC(&__stop___rfi_flush_fixup);
246 instrs[0] = 0x60000000; /* nop */
247 instrs[1] = 0x60000000; /* nop */
248 instrs[2] = 0x60000000; /* nop */
250 if (types & L1D_FLUSH_FALLBACK)
251 /* b .+16 to fallback flush */
252 instrs[0] = 0x48000010;
255 if (types & L1D_FLUSH_ORI) {
256 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
257 instrs[i++] = 0x63de0000; /* ori 30,30,0 L1d flush*/
260 if (types & L1D_FLUSH_MTTRIG)
261 instrs[i++] = 0x7c12dba6; /* mtspr TRIG2,r0 (SPR #882) */
263 for (i = 0; start < end; start++, i++) {
264 dest = (void *)start + *start;
266 pr_devel("patching dest %lx\n", (unsigned long)dest);
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]));
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)
279 (types & L1D_FLUSH_MTTRIG) ? "mttrig type"
283 void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end)
285 unsigned int instr, *dest;
292 instr = 0x60000000; /* nop */
295 pr_info("barrier-nospec: using ORI speculation barrier\n");
296 instr = 0x63ff0000; /* ori 31,31,0 speculation barrier */
299 for (i = 0; start < end; start++, i++) {
300 dest = (void *)start + *start;
302 pr_devel("patching dest %lx\n", (unsigned long)dest);
303 patch_instruction((struct ppc_inst *)dest, ppc_inst(instr));
306 printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i);
309 #endif /* CONFIG_PPC_BOOK3S_64 */
311 #ifdef CONFIG_PPC_BARRIER_NOSPEC
312 void do_barrier_nospec_fixups(bool enable)
316 start = PTRRELOC(&__start___barrier_nospec_fixup),
317 end = PTRRELOC(&__stop___barrier_nospec_fixup);
319 do_barrier_nospec_fixups_range(enable, start, end);
321 #endif /* CONFIG_PPC_BARRIER_NOSPEC */
323 #ifdef CONFIG_PPC_FSL_BOOK3E
324 void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end)
326 unsigned int instr[2], *dest;
333 instr[0] = PPC_INST_NOP;
334 instr[1] = PPC_INST_NOP;
337 pr_info("barrier-nospec: using isync; sync as speculation barrier\n");
338 instr[0] = PPC_INST_ISYNC;
339 instr[1] = PPC_INST_SYNC;
342 for (i = 0; start < end; start++, i++) {
343 dest = (void *)start + *start;
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]));
350 printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i);
353 static void patch_btb_flush_section(long *curr)
355 unsigned int *start, *end;
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));
365 void do_btb_flush_fixups(void)
369 start = PTRRELOC(&__start__btb_flush_fixup);
370 end = PTRRELOC(&__stop__btb_flush_fixup);
372 for (; start < end; start += 2)
373 patch_btb_flush_section(start);
375 #endif /* CONFIG_PPC_FSL_BOOK3E */
377 void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end)
380 struct ppc_inst *dest;
382 if (!(value & CPU_FTR_LWSYNC))
388 for (; start < end; start++) {
389 dest = (void *)start + *start;
390 raw_patch_instruction(dest, ppc_inst(PPC_INST_LWSYNC));
394 static void do_final_fixups(void)
396 #if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE)
397 struct ppc_inst inst, *src, *dest, *end;
399 if (PHYSICAL_START == 0)
402 src = (struct ppc_inst *)(KERNELBASE + PHYSICAL_START);
403 dest = (struct ppc_inst *)KERNELBASE;
404 end = (void *)src + (__end_interrupts - _stext);
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);
415 static unsigned long __initdata saved_cpu_features;
416 static unsigned int __initdata saved_mmu_features;
418 static unsigned long __initdata saved_firmware_features;
421 void __init apply_feature_fixups(void)
423 struct cpu_spec *spec = PTRRELOC(*PTRRELOC(&cur_cpu_spec));
425 *PTRRELOC(&saved_cpu_features) = spec->cpu_features;
426 *PTRRELOC(&saved_mmu_features) = spec->mmu_features;
429 * Apply the CPU-specific and firmware specific fixups to kernel text
430 * (nop out sections not relevant to this CPU or this firmware).
432 do_feature_fixups(spec->cpu_features,
433 PTRRELOC(&__start___ftr_fixup),
434 PTRRELOC(&__stop___ftr_fixup));
436 do_feature_fixups(spec->mmu_features,
437 PTRRELOC(&__start___mmu_ftr_fixup),
438 PTRRELOC(&__stop___mmu_ftr_fixup));
440 do_lwsync_fixups(spec->cpu_features,
441 PTRRELOC(&__start___lwsync_fixup),
442 PTRRELOC(&__stop___lwsync_fixup));
445 saved_firmware_features = powerpc_firmware_features;
446 do_feature_fixups(powerpc_firmware_features,
447 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
452 void __init setup_feature_keys(void)
455 * Initialise jump label. This causes all the cpu/mmu_has_feature()
456 * checks to take on their correct polarity based on the current set of
460 cpu_feature_keys_init();
461 mmu_feature_keys_init();
464 static int __init check_features(void)
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");
471 WARN(saved_firmware_features != powerpc_firmware_features,
472 "Firmware features changed after feature patching!\n");
477 late_initcall(check_features);
479 #ifdef CONFIG_FTR_FIXUP_SELFTEST
482 if (!(x)) printk("feature-fixups: test failed at line %d\n", __LINE__);
484 /* This must be after the text it fixes up, vmlinux.lds.S enforces that atm */
485 static struct fixup_entry fixup;
487 static long calc_offset(struct fixup_entry *entry, unsigned int *p)
489 return (unsigned long)p - (unsigned long)entry;
492 static void test_basic_patching(void)
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);
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;
506 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
508 /* Check we don't patch if the value matches */
509 patch_feature_section(8, &fixup);
510 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
512 /* Check we do patch if the value doesn't match */
513 patch_feature_section(0, &fixup);
514 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0);
516 /* Check we do patch if the mask doesn't match */
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);
523 static void test_alternative_patching(void)
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);
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);
539 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
541 /* Check we don't patch if the value matches */
542 patch_feature_section(0xF, &fixup);
543 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
545 /* Check we do patch if the value doesn't match */
546 patch_feature_section(0, &fixup);
547 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0);
549 /* Check we do patch if the mask doesn't match */
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);
556 static void test_alternative_case_too_big(void)
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);
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);
571 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
573 /* Expect nothing to be patched, and the error returned to us */
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);
582 static void test_alternative_case_too_small(void)
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);
592 /* Check a high-bit flag */
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);
601 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
603 /* Check we don't patch if the value matches */
604 patch_feature_section(flag, &fixup);
605 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
607 /* Check we do patch if the value doesn't match */
608 patch_feature_section(0, &fixup);
609 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0);
611 /* Check we do patch if the mask doesn't match */
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);
618 static void test_alternative_case_with_branch(void)
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);
625 check(memcmp(ftr_fixup_test5, ftr_fixup_test5_expected, size) == 0);
628 static void test_alternative_case_with_external_branch(void)
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);
635 check(memcmp(ftr_fixup_test6, ftr_fixup_test6_expected, size) == 0);
638 static void test_alternative_case_with_branch_to_end(void)
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);
645 check(memcmp(ftr_fixup_test7, ftr_fixup_test7_expected, size) == 0);
648 static void test_cpu_macros(void)
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;
655 /* The fixups have already been done for us during boot */
656 check(memcmp(ftr_fixup_test_FTR_macros,
657 ftr_fixup_test_FTR_macros_expected, size) == 0);
660 static void test_fw_macros(void)
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;
668 /* The fixups have already been done for us during boot */
669 check(memcmp(ftr_fixup_test_FW_FTR_macros,
670 ftr_fixup_test_FW_FTR_macros_expected, size) == 0);
674 static void test_lwsync_macros(void)
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 -
683 /* The fixups have already been done for us during boot */
684 if (cur_cpu_spec->cpu_features & CPU_FTR_LWSYNC) {
685 check(memcmp(lwsync_fixup_test,
686 lwsync_fixup_test_expected_LWSYNC, size) == 0);
688 check(memcmp(lwsync_fixup_test,
689 lwsync_fixup_test_expected_SYNC, size) == 0);
694 static void __init test_prefix_patching(void)
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);
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;
708 check(memcmp(ftr_fixup_prefix1, ftr_fixup_prefix1_orig, size) == 0);
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);
715 static void __init test_prefix_alt_patching(void)
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);
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);
730 check(memcmp(ftr_fixup_prefix2, ftr_fixup_prefix2_orig, size) == 0);
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);
737 static void __init test_prefix_word_alt_patching(void)
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);
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);
752 check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_orig, size) == 0);
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);
760 static inline void test_prefix_patching(void) {}
761 static inline void test_prefix_alt_patching(void) {}
762 static inline void test_prefix_word_alt_patching(void) {}
763 #endif /* CONFIG_PPC64 */
765 static int __init test_feature_fixups(void)
767 printk(KERN_DEBUG "Running feature fixup self-tests ...\n");
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();
778 test_lwsync_macros();
779 test_prefix_patching();
780 test_prefix_alt_patching();
781 test_prefix_word_alt_patching();
785 late_initcall(test_feature_fixups);
787 #endif /* CONFIG_FTR_FIXUP_SELFTEST */