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_entry_flush_fixups(enum l1d_flush_type types)
239 unsigned int instrs[3], *dest;
243 start = PTRRELOC(&__start___entry_flush_fixup);
244 end = PTRRELOC(&__stop___entry_flush_fixup);
246 instrs[0] = 0x60000000; /* nop */
247 instrs[1] = 0x60000000; /* nop */
248 instrs[2] = 0x60000000; /* nop */
251 if (types == L1D_FLUSH_FALLBACK) {
252 instrs[i++] = 0x7d4802a6; /* mflr r10 */
253 instrs[i++] = 0x60000000; /* branch patched below */
254 instrs[i++] = 0x7d4803a6; /* mtlr r10 */
257 if (types & L1D_FLUSH_ORI) {
258 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
259 instrs[i++] = 0x63de0000; /* ori 30,30,0 L1d flush*/
262 if (types & L1D_FLUSH_MTTRIG)
263 instrs[i++] = 0x7c12dba6; /* mtspr TRIG2,r0 (SPR #882) */
265 for (i = 0; start < end; start++, i++) {
266 dest = (void *)start + *start;
268 pr_devel("patching dest %lx\n", (unsigned long)dest);
270 patch_instruction((struct ppc_inst *)dest, ppc_inst(instrs[0]));
272 if (types == L1D_FLUSH_FALLBACK)
273 patch_branch((struct ppc_inst *)(dest + 1), (unsigned long)&entry_flush_fallback,
276 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instrs[1]));
278 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
281 printk(KERN_DEBUG "entry-flush: patched %d locations (%s flush)\n", i,
282 (types == L1D_FLUSH_NONE) ? "no" :
283 (types == L1D_FLUSH_FALLBACK) ? "fallback displacement" :
284 (types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG)
287 (types & L1D_FLUSH_MTTRIG) ? "mttrig type"
291 void do_rfi_flush_fixups(enum l1d_flush_type types)
293 unsigned int instrs[3], *dest;
297 start = PTRRELOC(&__start___rfi_flush_fixup),
298 end = PTRRELOC(&__stop___rfi_flush_fixup);
300 instrs[0] = 0x60000000; /* nop */
301 instrs[1] = 0x60000000; /* nop */
302 instrs[2] = 0x60000000; /* nop */
304 if (types & L1D_FLUSH_FALLBACK)
305 /* b .+16 to fallback flush */
306 instrs[0] = 0x48000010;
309 if (types & L1D_FLUSH_ORI) {
310 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
311 instrs[i++] = 0x63de0000; /* ori 30,30,0 L1d flush*/
314 if (types & L1D_FLUSH_MTTRIG)
315 instrs[i++] = 0x7c12dba6; /* mtspr TRIG2,r0 (SPR #882) */
317 for (i = 0; start < end; start++, i++) {
318 dest = (void *)start + *start;
320 pr_devel("patching dest %lx\n", (unsigned long)dest);
322 patch_instruction((struct ppc_inst *)dest, ppc_inst(instrs[0]));
323 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instrs[1]));
324 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
327 printk(KERN_DEBUG "rfi-flush: patched %d locations (%s flush)\n", i,
328 (types == L1D_FLUSH_NONE) ? "no" :
329 (types == L1D_FLUSH_FALLBACK) ? "fallback displacement" :
330 (types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG)
333 (types & L1D_FLUSH_MTTRIG) ? "mttrig type"
337 void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end)
339 unsigned int instr, *dest;
346 instr = 0x60000000; /* nop */
349 pr_info("barrier-nospec: using ORI speculation barrier\n");
350 instr = 0x63ff0000; /* ori 31,31,0 speculation barrier */
353 for (i = 0; start < end; start++, i++) {
354 dest = (void *)start + *start;
356 pr_devel("patching dest %lx\n", (unsigned long)dest);
357 patch_instruction((struct ppc_inst *)dest, ppc_inst(instr));
360 printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i);
363 #endif /* CONFIG_PPC_BOOK3S_64 */
365 #ifdef CONFIG_PPC_BARRIER_NOSPEC
366 void do_barrier_nospec_fixups(bool enable)
370 start = PTRRELOC(&__start___barrier_nospec_fixup),
371 end = PTRRELOC(&__stop___barrier_nospec_fixup);
373 do_barrier_nospec_fixups_range(enable, start, end);
375 #endif /* CONFIG_PPC_BARRIER_NOSPEC */
377 #ifdef CONFIG_PPC_FSL_BOOK3E
378 void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end)
380 unsigned int instr[2], *dest;
387 instr[0] = PPC_INST_NOP;
388 instr[1] = PPC_INST_NOP;
391 pr_info("barrier-nospec: using isync; sync as speculation barrier\n");
392 instr[0] = PPC_INST_ISYNC;
393 instr[1] = PPC_INST_SYNC;
396 for (i = 0; start < end; start++, i++) {
397 dest = (void *)start + *start;
399 pr_devel("patching dest %lx\n", (unsigned long)dest);
400 patch_instruction((struct ppc_inst *)dest, ppc_inst(instr[0]));
401 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instr[1]));
404 printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i);
407 static void patch_btb_flush_section(long *curr)
409 unsigned int *start, *end;
411 start = (void *)curr + *curr;
412 end = (void *)curr + *(curr + 1);
413 for (; start < end; start++) {
414 pr_devel("patching dest %lx\n", (unsigned long)start);
415 patch_instruction((struct ppc_inst *)start, ppc_inst(PPC_INST_NOP));
419 void do_btb_flush_fixups(void)
423 start = PTRRELOC(&__start__btb_flush_fixup);
424 end = PTRRELOC(&__stop__btb_flush_fixup);
426 for (; start < end; start += 2)
427 patch_btb_flush_section(start);
429 #endif /* CONFIG_PPC_FSL_BOOK3E */
431 void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end)
434 struct ppc_inst *dest;
436 if (!(value & CPU_FTR_LWSYNC))
442 for (; start < end; start++) {
443 dest = (void *)start + *start;
444 raw_patch_instruction(dest, ppc_inst(PPC_INST_LWSYNC));
448 static void do_final_fixups(void)
450 #if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE)
451 struct ppc_inst inst, *src, *dest, *end;
453 if (PHYSICAL_START == 0)
456 src = (struct ppc_inst *)(KERNELBASE + PHYSICAL_START);
457 dest = (struct ppc_inst *)KERNELBASE;
458 end = (void *)src + (__end_interrupts - _stext);
461 inst = ppc_inst_read(src);
462 raw_patch_instruction(dest, inst);
463 src = ppc_inst_next(src, src);
464 dest = ppc_inst_next(dest, dest);
469 static unsigned long __initdata saved_cpu_features;
470 static unsigned int __initdata saved_mmu_features;
472 static unsigned long __initdata saved_firmware_features;
475 void __init apply_feature_fixups(void)
477 struct cpu_spec *spec = PTRRELOC(*PTRRELOC(&cur_cpu_spec));
479 *PTRRELOC(&saved_cpu_features) = spec->cpu_features;
480 *PTRRELOC(&saved_mmu_features) = spec->mmu_features;
483 * Apply the CPU-specific and firmware specific fixups to kernel text
484 * (nop out sections not relevant to this CPU or this firmware).
486 do_feature_fixups(spec->cpu_features,
487 PTRRELOC(&__start___ftr_fixup),
488 PTRRELOC(&__stop___ftr_fixup));
490 do_feature_fixups(spec->mmu_features,
491 PTRRELOC(&__start___mmu_ftr_fixup),
492 PTRRELOC(&__stop___mmu_ftr_fixup));
494 do_lwsync_fixups(spec->cpu_features,
495 PTRRELOC(&__start___lwsync_fixup),
496 PTRRELOC(&__stop___lwsync_fixup));
499 saved_firmware_features = powerpc_firmware_features;
500 do_feature_fixups(powerpc_firmware_features,
501 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
506 void __init setup_feature_keys(void)
509 * Initialise jump label. This causes all the cpu/mmu_has_feature()
510 * checks to take on their correct polarity based on the current set of
514 cpu_feature_keys_init();
515 mmu_feature_keys_init();
518 static int __init check_features(void)
520 WARN(saved_cpu_features != cur_cpu_spec->cpu_features,
521 "CPU features changed after feature patching!\n");
522 WARN(saved_mmu_features != cur_cpu_spec->mmu_features,
523 "MMU features changed after feature patching!\n");
525 WARN(saved_firmware_features != powerpc_firmware_features,
526 "Firmware features changed after feature patching!\n");
531 late_initcall(check_features);
533 #ifdef CONFIG_FTR_FIXUP_SELFTEST
536 if (!(x)) printk("feature-fixups: test failed at line %d\n", __LINE__);
538 /* This must be after the text it fixes up, vmlinux.lds.S enforces that atm */
539 static struct fixup_entry fixup;
541 static long calc_offset(struct fixup_entry *entry, unsigned int *p)
543 return (unsigned long)p - (unsigned long)entry;
546 static void test_basic_patching(void)
548 extern unsigned int ftr_fixup_test1[];
549 extern unsigned int end_ftr_fixup_test1[];
550 extern unsigned int ftr_fixup_test1_orig[];
551 extern unsigned int ftr_fixup_test1_expected[];
552 int size = 4 * (end_ftr_fixup_test1 - ftr_fixup_test1);
554 fixup.value = fixup.mask = 8;
555 fixup.start_off = calc_offset(&fixup, ftr_fixup_test1 + 1);
556 fixup.end_off = calc_offset(&fixup, ftr_fixup_test1 + 2);
557 fixup.alt_start_off = fixup.alt_end_off = 0;
560 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
562 /* Check we don't patch if the value matches */
563 patch_feature_section(8, &fixup);
564 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
566 /* Check we do patch if the value doesn't match */
567 patch_feature_section(0, &fixup);
568 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0);
570 /* Check we do patch if the mask doesn't match */
571 memcpy(ftr_fixup_test1, ftr_fixup_test1_orig, size);
572 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
573 patch_feature_section(~8, &fixup);
574 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0);
577 static void test_alternative_patching(void)
579 extern unsigned int ftr_fixup_test2[];
580 extern unsigned int end_ftr_fixup_test2[];
581 extern unsigned int ftr_fixup_test2_orig[];
582 extern unsigned int ftr_fixup_test2_alt[];
583 extern unsigned int ftr_fixup_test2_expected[];
584 int size = 4 * (end_ftr_fixup_test2 - ftr_fixup_test2);
586 fixup.value = fixup.mask = 0xF;
587 fixup.start_off = calc_offset(&fixup, ftr_fixup_test2 + 1);
588 fixup.end_off = calc_offset(&fixup, ftr_fixup_test2 + 2);
589 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test2_alt);
590 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test2_alt + 1);
593 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
595 /* Check we don't patch if the value matches */
596 patch_feature_section(0xF, &fixup);
597 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
599 /* Check we do patch if the value doesn't match */
600 patch_feature_section(0, &fixup);
601 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0);
603 /* Check we do patch if the mask doesn't match */
604 memcpy(ftr_fixup_test2, ftr_fixup_test2_orig, size);
605 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
606 patch_feature_section(~0xF, &fixup);
607 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0);
610 static void test_alternative_case_too_big(void)
612 extern unsigned int ftr_fixup_test3[];
613 extern unsigned int end_ftr_fixup_test3[];
614 extern unsigned int ftr_fixup_test3_orig[];
615 extern unsigned int ftr_fixup_test3_alt[];
616 int size = 4 * (end_ftr_fixup_test3 - ftr_fixup_test3);
618 fixup.value = fixup.mask = 0xC;
619 fixup.start_off = calc_offset(&fixup, ftr_fixup_test3 + 1);
620 fixup.end_off = calc_offset(&fixup, ftr_fixup_test3 + 2);
621 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test3_alt);
622 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test3_alt + 2);
625 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
627 /* Expect nothing to be patched, and the error returned to us */
628 check(patch_feature_section(0xF, &fixup) == 1);
629 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
630 check(patch_feature_section(0, &fixup) == 1);
631 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
632 check(patch_feature_section(~0xF, &fixup) == 1);
633 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
636 static void test_alternative_case_too_small(void)
638 extern unsigned int ftr_fixup_test4[];
639 extern unsigned int end_ftr_fixup_test4[];
640 extern unsigned int ftr_fixup_test4_orig[];
641 extern unsigned int ftr_fixup_test4_alt[];
642 extern unsigned int ftr_fixup_test4_expected[];
643 int size = 4 * (end_ftr_fixup_test4 - ftr_fixup_test4);
646 /* Check a high-bit flag */
647 flag = 1UL << ((sizeof(unsigned long) - 1) * 8);
648 fixup.value = fixup.mask = flag;
649 fixup.start_off = calc_offset(&fixup, ftr_fixup_test4 + 1);
650 fixup.end_off = calc_offset(&fixup, ftr_fixup_test4 + 5);
651 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test4_alt);
652 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test4_alt + 2);
655 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
657 /* Check we don't patch if the value matches */
658 patch_feature_section(flag, &fixup);
659 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
661 /* Check we do patch if the value doesn't match */
662 patch_feature_section(0, &fixup);
663 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0);
665 /* Check we do patch if the mask doesn't match */
666 memcpy(ftr_fixup_test4, ftr_fixup_test4_orig, size);
667 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
668 patch_feature_section(~flag, &fixup);
669 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0);
672 static void test_alternative_case_with_branch(void)
674 extern unsigned int ftr_fixup_test5[];
675 extern unsigned int end_ftr_fixup_test5[];
676 extern unsigned int ftr_fixup_test5_expected[];
677 int size = 4 * (end_ftr_fixup_test5 - ftr_fixup_test5);
679 check(memcmp(ftr_fixup_test5, ftr_fixup_test5_expected, size) == 0);
682 static void test_alternative_case_with_external_branch(void)
684 extern unsigned int ftr_fixup_test6[];
685 extern unsigned int end_ftr_fixup_test6[];
686 extern unsigned int ftr_fixup_test6_expected[];
687 int size = 4 * (end_ftr_fixup_test6 - ftr_fixup_test6);
689 check(memcmp(ftr_fixup_test6, ftr_fixup_test6_expected, size) == 0);
692 static void test_alternative_case_with_branch_to_end(void)
694 extern unsigned int ftr_fixup_test7[];
695 extern unsigned int end_ftr_fixup_test7[];
696 extern unsigned int ftr_fixup_test7_expected[];
697 int size = 4 * (end_ftr_fixup_test7 - ftr_fixup_test7);
699 check(memcmp(ftr_fixup_test7, ftr_fixup_test7_expected, size) == 0);
702 static void test_cpu_macros(void)
704 extern u8 ftr_fixup_test_FTR_macros[];
705 extern u8 ftr_fixup_test_FTR_macros_expected[];
706 unsigned long size = ftr_fixup_test_FTR_macros_expected -
707 ftr_fixup_test_FTR_macros;
709 /* The fixups have already been done for us during boot */
710 check(memcmp(ftr_fixup_test_FTR_macros,
711 ftr_fixup_test_FTR_macros_expected, size) == 0);
714 static void test_fw_macros(void)
717 extern u8 ftr_fixup_test_FW_FTR_macros[];
718 extern u8 ftr_fixup_test_FW_FTR_macros_expected[];
719 unsigned long size = ftr_fixup_test_FW_FTR_macros_expected -
720 ftr_fixup_test_FW_FTR_macros;
722 /* The fixups have already been done for us during boot */
723 check(memcmp(ftr_fixup_test_FW_FTR_macros,
724 ftr_fixup_test_FW_FTR_macros_expected, size) == 0);
728 static void test_lwsync_macros(void)
730 extern u8 lwsync_fixup_test[];
731 extern u8 end_lwsync_fixup_test[];
732 extern u8 lwsync_fixup_test_expected_LWSYNC[];
733 extern u8 lwsync_fixup_test_expected_SYNC[];
734 unsigned long size = end_lwsync_fixup_test -
737 /* The fixups have already been done for us during boot */
738 if (cur_cpu_spec->cpu_features & CPU_FTR_LWSYNC) {
739 check(memcmp(lwsync_fixup_test,
740 lwsync_fixup_test_expected_LWSYNC, size) == 0);
742 check(memcmp(lwsync_fixup_test,
743 lwsync_fixup_test_expected_SYNC, size) == 0);
748 static void __init test_prefix_patching(void)
750 extern unsigned int ftr_fixup_prefix1[];
751 extern unsigned int end_ftr_fixup_prefix1[];
752 extern unsigned int ftr_fixup_prefix1_orig[];
753 extern unsigned int ftr_fixup_prefix1_expected[];
754 int size = sizeof(unsigned int) * (end_ftr_fixup_prefix1 - ftr_fixup_prefix1);
756 fixup.value = fixup.mask = 8;
757 fixup.start_off = calc_offset(&fixup, ftr_fixup_prefix1 + 1);
758 fixup.end_off = calc_offset(&fixup, ftr_fixup_prefix1 + 3);
759 fixup.alt_start_off = fixup.alt_end_off = 0;
762 check(memcmp(ftr_fixup_prefix1, ftr_fixup_prefix1_orig, size) == 0);
764 patch_feature_section(0, &fixup);
765 check(memcmp(ftr_fixup_prefix1, ftr_fixup_prefix1_expected, size) == 0);
766 check(memcmp(ftr_fixup_prefix1, ftr_fixup_prefix1_orig, size) != 0);
769 static void __init test_prefix_alt_patching(void)
771 extern unsigned int ftr_fixup_prefix2[];
772 extern unsigned int end_ftr_fixup_prefix2[];
773 extern unsigned int ftr_fixup_prefix2_orig[];
774 extern unsigned int ftr_fixup_prefix2_expected[];
775 extern unsigned int ftr_fixup_prefix2_alt[];
776 int size = sizeof(unsigned int) * (end_ftr_fixup_prefix2 - ftr_fixup_prefix2);
778 fixup.value = fixup.mask = 8;
779 fixup.start_off = calc_offset(&fixup, ftr_fixup_prefix2 + 1);
780 fixup.end_off = calc_offset(&fixup, ftr_fixup_prefix2 + 3);
781 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_prefix2_alt);
782 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_prefix2_alt + 2);
784 check(memcmp(ftr_fixup_prefix2, ftr_fixup_prefix2_orig, size) == 0);
786 patch_feature_section(0, &fixup);
787 check(memcmp(ftr_fixup_prefix2, ftr_fixup_prefix2_expected, size) == 0);
788 check(memcmp(ftr_fixup_prefix2, ftr_fixup_prefix2_orig, size) != 0);
791 static void __init test_prefix_word_alt_patching(void)
793 extern unsigned int ftr_fixup_prefix3[];
794 extern unsigned int end_ftr_fixup_prefix3[];
795 extern unsigned int ftr_fixup_prefix3_orig[];
796 extern unsigned int ftr_fixup_prefix3_expected[];
797 extern unsigned int ftr_fixup_prefix3_alt[];
798 int size = sizeof(unsigned int) * (end_ftr_fixup_prefix3 - ftr_fixup_prefix3);
800 fixup.value = fixup.mask = 8;
801 fixup.start_off = calc_offset(&fixup, ftr_fixup_prefix3 + 1);
802 fixup.end_off = calc_offset(&fixup, ftr_fixup_prefix3 + 4);
803 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_prefix3_alt);
804 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_prefix3_alt + 3);
806 check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_orig, size) == 0);
808 patch_feature_section(0, &fixup);
809 check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_expected, size) == 0);
810 patch_feature_section(0, &fixup);
811 check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_orig, size) != 0);
814 static inline void test_prefix_patching(void) {}
815 static inline void test_prefix_alt_patching(void) {}
816 static inline void test_prefix_word_alt_patching(void) {}
817 #endif /* CONFIG_PPC64 */
819 static int __init test_feature_fixups(void)
821 printk(KERN_DEBUG "Running feature fixup self-tests ...\n");
823 test_basic_patching();
824 test_alternative_patching();
825 test_alternative_case_too_big();
826 test_alternative_case_too_small();
827 test_alternative_case_with_branch();
828 test_alternative_case_with_external_branch();
829 test_alternative_case_with_branch_to_end();
832 test_lwsync_macros();
833 test_prefix_patching();
834 test_prefix_alt_patching();
835 test_prefix_word_alt_patching();
839 late_initcall(test_feature_fixups);
841 #endif /* CONFIG_FTR_FIXUP_SELFTEST */