[mirror_ubuntu-bionic-kernel.git] / arch / powerpc / lib / feature-fixups.c

/*
 *  Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
 *
 *  Modifications for ppc64:
 *      Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
 *
 *  Copyright 2008 Michael Ellerman, IBM Corporation.
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <asm/cputable.h>
#include <asm/code-patching.h>
#include <asm/page.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/firmware.h>

struct fixup_entry {
	unsigned long	mask;
	unsigned long	value;
	long		start_off;
	long		end_off;
	long		alt_start_off;
	long		alt_end_off;
};

static unsigned int *calc_addr(struct fixup_entry *fcur, long offset)
{
	/*
	 * We store the offset to the code as a negative offset from
	 * the start of the alt_entry, to support the VDSO. This
	 * routine converts that back into an actual address.
	 */
	return (unsigned int *)((unsigned long)fcur + offset);
}

static int patch_alt_instruction(unsigned int *src, unsigned int *dest,
				 unsigned int *alt_start, unsigned int *alt_end)
{
	unsigned int instr;

	instr = *src;

	if (instr_is_relative_branch(*src)) {
		unsigned int *target = (unsigned int *)branch_target(src);

		/* Branch within the section doesn't need translating */
		if (target < alt_start || target >= alt_end) {
			instr = translate_branch(dest, src);
			if (!instr)
				return 1;
		}
	}

	patch_instruction(dest, instr);

	return 0;
}

static int patch_feature_section(unsigned long value, struct fixup_entry *fcur)
{
	unsigned int *start, *end, *alt_start, *alt_end, *src, *dest;

	start = calc_addr(fcur, fcur->start_off);
	end = calc_addr(fcur, fcur->end_off);
	alt_start = calc_addr(fcur, fcur->alt_start_off);
	alt_end = calc_addr(fcur, fcur->alt_end_off);

	if ((alt_end - alt_start) > (end - start))
		return 1;

	if ((value & fcur->mask) == fcur->value)
		return 0;

	src = alt_start;
	dest = start;

	for (; src < alt_end; src++, dest++) {
		if (patch_alt_instruction(src, dest, alt_start, alt_end))
			return 1;
	}

	for (; dest < end; dest++)
		patch_instruction(dest, PPC_INST_NOP);

	return 0;
}

void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end)
{
	struct fixup_entry *fcur, *fend;

	fcur = fixup_start;
	fend = fixup_end;

	for (; fcur < fend; fcur++) {
		if (patch_feature_section(value, fcur)) {
			WARN_ON(1);
			printk("Unable to patch feature section at %p - %p" \
				" with %p - %p\n",
				calc_addr(fcur, fcur->start_off),
				calc_addr(fcur, fcur->end_off),
				calc_addr(fcur, fcur->alt_start_off),
				calc_addr(fcur, fcur->alt_end_off));
		}
	}
}

void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end)
{
	long *start, *end;
	unsigned int *dest;

	if (!(value & CPU_FTR_LWSYNC))
		return ;

	start = fixup_start;
	end = fixup_end;

	for (; start < end; start++) {
		dest = (void *)start + *start;
		patch_instruction(dest, PPC_INST_LWSYNC);
	}
}

static void do_final_fixups(void)
{
#if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE)
	int *src, *dest;
	unsigned long length;

	if (PHYSICAL_START == 0)
		return;

	src = (int *)(KERNELBASE + PHYSICAL_START);
	dest = (int *)KERNELBASE;
	length = (__end_interrupts - _stext) / sizeof(int);

	while (length--) {
		patch_instruction(dest, *src);
		src++;
		dest++;
	}
#endif
}

static unsigned long __initdata saved_cpu_features;
static unsigned int __initdata saved_mmu_features;
#ifdef CONFIG_PPC64
static unsigned long __initdata saved_firmware_features;
#endif

void __init apply_feature_fixups(void)
{
	struct cpu_spec *spec = *PTRRELOC(&cur_cpu_spec);

	*PTRRELOC(&saved_cpu_features) = spec->cpu_features;
	*PTRRELOC(&saved_mmu_features) = spec->mmu_features;

	/*
	 * Apply the CPU-specific and firmware specific fixups to kernel text
	 * (nop out sections not relevant to this CPU or this firmware).
	 */
	do_feature_fixups(spec->cpu_features,
			  PTRRELOC(&__start___ftr_fixup),
			  PTRRELOC(&__stop___ftr_fixup));

	do_feature_fixups(spec->mmu_features,
			  PTRRELOC(&__start___mmu_ftr_fixup),
			  PTRRELOC(&__stop___mmu_ftr_fixup));

	do_lwsync_fixups(spec->cpu_features,
			 PTRRELOC(&__start___lwsync_fixup),
			 PTRRELOC(&__stop___lwsync_fixup));

#ifdef CONFIG_PPC64
	saved_firmware_features = powerpc_firmware_features;
	do_feature_fixups(powerpc_firmware_features,
			  &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
#endif
	do_final_fixups();
}

static int __init check_features(void)
{
	WARN(saved_cpu_features != cur_cpu_spec->cpu_features,
	     "CPU features changed after feature patching!\n");
	WARN(saved_mmu_features != cur_cpu_spec->mmu_features,
	     "MMU features changed after feature patching!\n");
#ifdef CONFIG_PPC64
	WARN(saved_firmware_features != powerpc_firmware_features,
	     "Firmware features changed after feature patching!\n");
#endif

	return 0;
}
late_initcall(check_features);

#ifdef CONFIG_FTR_FIXUP_SELFTEST

#define check(x)	\
	if (!(x)) printk("feature-fixups: test failed at line %d\n", __LINE__);

/* This must be after the text it fixes up, vmlinux.lds.S enforces that atm */
static struct fixup_entry fixup;

static long calc_offset(struct fixup_entry *entry, unsigned int *p)
{
	return (unsigned long)p - (unsigned long)entry;
}

static void test_basic_patching(void)
{
	extern unsigned int ftr_fixup_test1;
	extern unsigned int end_ftr_fixup_test1;
	extern unsigned int ftr_fixup_test1_orig;
	extern unsigned int ftr_fixup_test1_expected;
	int size = &end_ftr_fixup_test1 - &ftr_fixup_test1;

	fixup.value = fixup.mask = 8;
	fixup.start_off = calc_offset(&fixup, &ftr_fixup_test1 + 1);
	fixup.end_off = calc_offset(&fixup, &ftr_fixup_test1 + 2);
	fixup.alt_start_off = fixup.alt_end_off = 0;

	/* Sanity check */
	check(memcmp(&ftr_fixup_test1, &ftr_fixup_test1_orig, size) == 0);

	/* Check we don't patch if the value matches */
	patch_feature_section(8, &fixup);
	check(memcmp(&ftr_fixup_test1, &ftr_fixup_test1_orig, size) == 0);

	/* Check we do patch if the value doesn't match */
	patch_feature_section(0, &fixup);
	check(memcmp(&ftr_fixup_test1, &ftr_fixup_test1_expected, size) == 0);

	/* Check we do patch if the mask doesn't match */
	memcpy(&ftr_fixup_test1, &ftr_fixup_test1_orig, size);
	check(memcmp(&ftr_fixup_test1, &ftr_fixup_test1_orig, size) == 0);
	patch_feature_section(~8, &fixup);
	check(memcmp(&ftr_fixup_test1, &ftr_fixup_test1_expected, size) == 0);
}

static void test_alternative_patching(void)
{
	extern unsigned int ftr_fixup_test2;
	extern unsigned int end_ftr_fixup_test2;
	extern unsigned int ftr_fixup_test2_orig;
	extern unsigned int ftr_fixup_test2_alt;
	extern unsigned int ftr_fixup_test2_expected;
	int size = &end_ftr_fixup_test2 - &ftr_fixup_test2;

	fixup.value = fixup.mask = 0xF;
	fixup.start_off = calc_offset(&fixup, &ftr_fixup_test2 + 1);
	fixup.end_off = calc_offset(&fixup, &ftr_fixup_test2 + 2);
	fixup.alt_start_off = calc_offset(&fixup, &ftr_fixup_test2_alt);
	fixup.alt_end_off = calc_offset(&fixup, &ftr_fixup_test2_alt + 1);

	/* Sanity check */
	check(memcmp(&ftr_fixup_test2, &ftr_fixup_test2_orig, size) == 0);

	/* Check we don't patch if the value matches */
	patch_feature_section(0xF, &fixup);
	check(memcmp(&ftr_fixup_test2, &ftr_fixup_test2_orig, size) == 0);

	/* Check we do patch if the value doesn't match */
	patch_feature_section(0, &fixup);
	check(memcmp(&ftr_fixup_test2, &ftr_fixup_test2_expected, size) == 0);

	/* Check we do patch if the mask doesn't match */
	memcpy(&ftr_fixup_test2, &ftr_fixup_test2_orig, size);
	check(memcmp(&ftr_fixup_test2, &ftr_fixup_test2_orig, size) == 0);
	patch_feature_section(~0xF, &fixup);
	check(memcmp(&ftr_fixup_test2, &ftr_fixup_test2_expected, size) == 0);
}

static void test_alternative_case_too_big(void)
{
	extern unsigned int ftr_fixup_test3;
	extern unsigned int end_ftr_fixup_test3;
	extern unsigned int ftr_fixup_test3_orig;
	extern unsigned int ftr_fixup_test3_alt;
	int size = &end_ftr_fixup_test3 - &ftr_fixup_test3;

	fixup.value = fixup.mask = 0xC;
	fixup.start_off = calc_offset(&fixup, &ftr_fixup_test3 + 1);
	fixup.end_off = calc_offset(&fixup, &ftr_fixup_test3 + 2);
	fixup.alt_start_off = calc_offset(&fixup, &ftr_fixup_test3_alt);
	fixup.alt_end_off = calc_offset(&fixup, &ftr_fixup_test3_alt + 2);

	/* Sanity check */
	check(memcmp(&ftr_fixup_test3, &ftr_fixup_test3_orig, size) == 0);

	/* Expect nothing to be patched, and the error returned to us */
	check(patch_feature_section(0xF, &fixup) == 1);
	check(memcmp(&ftr_fixup_test3, &ftr_fixup_test3_orig, size) == 0);
	check(patch_feature_section(0, &fixup) == 1);
	check(memcmp(&ftr_fixup_test3, &ftr_fixup_test3_orig, size) == 0);
	check(patch_feature_section(~0xF, &fixup) == 1);
	check(memcmp(&ftr_fixup_test3, &ftr_fixup_test3_orig, size) == 0);
}

static void test_alternative_case_too_small(void)
{
	extern unsigned int ftr_fixup_test4;
	extern unsigned int end_ftr_fixup_test4;
	extern unsigned int ftr_fixup_test4_orig;
	extern unsigned int ftr_fixup_test4_alt;
	extern unsigned int ftr_fixup_test4_expected;
	int size = &end_ftr_fixup_test4 - &ftr_fixup_test4;
	unsigned long flag;

	/* Check a high-bit flag */
	flag = 1UL << ((sizeof(unsigned long) - 1) * 8);
	fixup.value = fixup.mask = flag;
	fixup.start_off = calc_offset(&fixup, &ftr_fixup_test4 + 1);
	fixup.end_off = calc_offset(&fixup, &ftr_fixup_test4 + 5);
	fixup.alt_start_off = calc_offset(&fixup, &ftr_fixup_test4_alt);
	fixup.alt_end_off = calc_offset(&fixup, &ftr_fixup_test4_alt + 2);

	/* Sanity check */
	check(memcmp(&ftr_fixup_test4, &ftr_fixup_test4_orig, size) == 0);

	/* Check we don't patch if the value matches */
	patch_feature_section(flag, &fixup);
	check(memcmp(&ftr_fixup_test4, &ftr_fixup_test4_orig, size) == 0);

	/* Check we do patch if the value doesn't match */
	patch_feature_section(0, &fixup);
	check(memcmp(&ftr_fixup_test4, &ftr_fixup_test4_expected, size) == 0);

	/* Check we do patch if the mask doesn't match */
	memcpy(&ftr_fixup_test4, &ftr_fixup_test4_orig, size);
	check(memcmp(&ftr_fixup_test4, &ftr_fixup_test4_orig, size) == 0);
	patch_feature_section(~flag, &fixup);
	check(memcmp(&ftr_fixup_test4, &ftr_fixup_test4_expected, size) == 0);
}

static void test_alternative_case_with_branch(void)
{
	extern unsigned int ftr_fixup_test5;
	extern unsigned int end_ftr_fixup_test5;
	extern unsigned int ftr_fixup_test5_expected;
	int size = &end_ftr_fixup_test5 - &ftr_fixup_test5;

	check(memcmp(&ftr_fixup_test5, &ftr_fixup_test5_expected, size) == 0);
}

static void test_alternative_case_with_external_branch(void)
{
	extern unsigned int ftr_fixup_test6;
	extern unsigned int end_ftr_fixup_test6;
	extern unsigned int ftr_fixup_test6_expected;
	int size = &end_ftr_fixup_test6 - &ftr_fixup_test6;

	check(memcmp(&ftr_fixup_test6, &ftr_fixup_test6_expected, size) == 0);
}

static void test_cpu_macros(void)
{
	extern u8 ftr_fixup_test_FTR_macros;
	extern u8 ftr_fixup_test_FTR_macros_expected;
	unsigned long size = &ftr_fixup_test_FTR_macros_expected -
			     &ftr_fixup_test_FTR_macros;

	/* The fixups have already been done for us during boot */
	check(memcmp(&ftr_fixup_test_FTR_macros,
		     &ftr_fixup_test_FTR_macros_expected, size) == 0);
}

static void test_fw_macros(void)
{
#ifdef CONFIG_PPC64
	extern u8 ftr_fixup_test_FW_FTR_macros;
	extern u8 ftr_fixup_test_FW_FTR_macros_expected;
	unsigned long size = &ftr_fixup_test_FW_FTR_macros_expected -
			     &ftr_fixup_test_FW_FTR_macros;

	/* The fixups have already been done for us during boot */
	check(memcmp(&ftr_fixup_test_FW_FTR_macros,
		     &ftr_fixup_test_FW_FTR_macros_expected, size) == 0);
#endif
}

static void test_lwsync_macros(void)
{
	extern u8 lwsync_fixup_test;
	extern u8 end_lwsync_fixup_test;
	extern u8 lwsync_fixup_test_expected_LWSYNC;
	extern u8 lwsync_fixup_test_expected_SYNC;
	unsigned long size = &end_lwsync_fixup_test -
			     &lwsync_fixup_test;

	/* The fixups have already been done for us during boot */
	if (cur_cpu_spec->cpu_features & CPU_FTR_LWSYNC) {
		check(memcmp(&lwsync_fixup_test,
			     &lwsync_fixup_test_expected_LWSYNC, size) == 0);
	} else {
		check(memcmp(&lwsync_fixup_test,
			     &lwsync_fixup_test_expected_SYNC, size) == 0);
	}
}

static int __init test_feature_fixups(void)
{
	printk(KERN_DEBUG "Running feature fixup self-tests ...\n");

	test_basic_patching();
	test_alternative_patching();
	test_alternative_case_too_big();
	test_alternative_case_too_small();
	test_alternative_case_with_branch();
	test_alternative_case_with_external_branch();
	test_cpu_macros();
	test_fw_macros();
	test_lwsync_macros();

	return 0;
}
late_initcall(test_feature_fixups);

#endif /* CONFIG_FTR_FIXUP_SELFTEST */
Commit	Line	Data
51c52e86 ME	1	/*
	2	* Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
	3	*
	4	* Modifications for ppc64:
	5	* Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
	6	*
	7	* Copyright 2008 Michael Ellerman, IBM Corporation.
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License
	11	* as published by the Free Software Foundation; either version
	12	* 2 of the License, or (at your option) any later version.
	13	*/
	14
3880ecb0	15	#include <linux/types.h>
51c52e86	16	#include <linux/kernel.h>
362e7701 ME	17	#include <linux/string.h>
362e7701 ME	18	#include <linux/init.h>
51c52e86 ME	19	#include <asm/cputable.h>
51c52e86 ME	20	#include <asm/code-patching.h>
d715e433 AB	21	#include <asm/page.h>
d715e433 AB	22	#include <asm/sections.h>
9402c684 BH	23	#include <asm/setup.h>
9402c684 BH	24	#include <asm/firmware.h>
51c52e86 ME	25
	26	struct fixup_entry {
	27	unsigned long mask;
	28	unsigned long value;
	29	long start_off;
	30	long end_off;
fac23fe4 ME	31	long alt_start_off;
fac23fe4 ME	32	long alt_end_off;
51c52e86 ME	33	};
51c52e86 ME	34
9b1a735d	35	static unsigned int calc_addr(struct fixup_entry fcur, long offset)
51c52e86	36	{
9b1a735d ME	37	/*
	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.
	41	*/
	42	return (unsigned int *)((unsigned long)fcur + offset);
	43	}
	44
	45	static int patch_alt_instruction(unsigned int src, unsigned int dest,
	46	unsigned int alt_start, unsigned int alt_end)
	47	{
	48	unsigned int instr;
	49
	50	instr = *src;
	51
	52	if (instr_is_relative_branch(*src)) {
	53	unsigned int target = (unsigned int )branch_target(src);
	54
	55	/* Branch within the section doesn't need translating */
	56	if (target < alt_start \|\| target >= alt_end) {
	57	instr = translate_branch(dest, src);
	58	if (!instr)
	59	return 1;
	60	}
	61	}
	62
	63	patch_instruction(dest, instr);
	64
	65	return 0;
	66	}
	67
	68	static int patch_feature_section(unsigned long value, struct fixup_entry *fcur)
	69	{
	70	unsigned int start, end, alt_start, alt_end, src, dest;
	71
	72	start = calc_addr(fcur, fcur->start_off);
	73	end = calc_addr(fcur, fcur->end_off);
	74	alt_start = calc_addr(fcur, fcur->alt_start_off);
	75	alt_end = calc_addr(fcur, fcur->alt_end_off);
	76
	77	if ((alt_end - alt_start) > (end - start))
	78	return 1;
51c52e86 ME	79
51c52e86 ME	80	if ((value & fcur->mask) == fcur->value)
9b1a735d	81	return 0;
51c52e86	82
9b1a735d ME	83	src = alt_start;
9b1a735d ME	84	dest = start;
51c52e86	85
9b1a735d ME	86	for (; src < alt_end; src++, dest++) {
	87	if (patch_alt_instruction(src, dest, alt_start, alt_end))
	88	return 1;
51c52e86	89	}
9b1a735d ME	90
9b1a735d ME	91	for (; dest < end; dest++)
16c57b36	92	patch_instruction(dest, PPC_INST_NOP);
9b1a735d ME	93
9b1a735d ME	94	return 0;
51c52e86 ME	95	}
	96
	97	void do_feature_fixups(unsigned long value, void fixup_start, void fixup_end)
	98	{
	99	struct fixup_entry fcur, fend;
	100
	101	fcur = fixup_start;
	102	fend = fixup_end;
	103
9b1a735d ME	104	for (; fcur < fend; fcur++) {
9b1a735d ME	105	if (patch_feature_section(value, fcur)) {
1856c020	106	WARN_ON(1);
9b1a735d ME	107	printk("Unable to patch feature section at %p - %p" \
	108	" with %p - %p\n",
	109	calc_addr(fcur, fcur->start_off),
	110	calc_addr(fcur, fcur->end_off),
	111	calc_addr(fcur, fcur->alt_start_off),
	112	calc_addr(fcur, fcur->alt_end_off));
	113	}
	114	}
51c52e86	115	}
362e7701	116
2d1b2027 KG	117	void do_lwsync_fixups(unsigned long value, void fixup_start, void fixup_end)
2d1b2027 KG	118	{
3d98ffbf BH	119	long start, end;
3d98ffbf BH	120	unsigned int *dest;
2d1b2027 KG	121
	122	if (!(value & CPU_FTR_LWSYNC))
	123	return ;
	124
	125	start = fixup_start;
	126	end = fixup_end;
	127
	128	for (; start < end; start++) {
	129	dest = (void )start + start;
16c57b36	130	patch_instruction(dest, PPC_INST_LWSYNC);
2d1b2027 KG	131	}
	132	}
	133
9402c684	134	static void do_final_fixups(void)
d715e433 AB	135	{
	136	#if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE)
	137	int src, dest;
	138	unsigned long length;
	139
	140	if (PHYSICAL_START == 0)
	141	return;
	142
	143	src = (int *)(KERNELBASE + PHYSICAL_START);
	144	dest = (int *)KERNELBASE;
	145	length = (__end_interrupts - _stext) / sizeof(int);
	146
	147	while (length--) {
	148	patch_instruction(dest, *src);
	149	src++;
	150	dest++;
	151	}
	152	#endif
	153	}
	154
a28e46f1 ME	155	static unsigned long __initdata saved_cpu_features;
	156	static unsigned int __initdata saved_mmu_features;
	157	#ifdef CONFIG_PPC64
	158	static unsigned long __initdata saved_firmware_features;
	159	#endif
	160
	161	void __init apply_feature_fixups(void)
9402c684 BH	162	{
	163	struct cpu_spec spec = PTRRELOC(&cur_cpu_spec);
	164
a28e46f1 ME	165	*PTRRELOC(&saved_cpu_features) = spec->cpu_features;
	166	*PTRRELOC(&saved_mmu_features) = spec->mmu_features;
	167
9402c684 BH	168	/*
	169	* Apply the CPU-specific and firmware specific fixups to kernel text
	170	* (nop out sections not relevant to this CPU or this firmware).
	171	*/
	172	do_feature_fixups(spec->cpu_features,
	173	PTRRELOC(&__start___ftr_fixup),
	174	PTRRELOC(&__stop___ftr_fixup));
	175
	176	do_feature_fixups(spec->mmu_features,
	177	PTRRELOC(&__start___mmu_ftr_fixup),
	178	PTRRELOC(&__stop___mmu_ftr_fixup));
	179
	180	do_lwsync_fixups(spec->cpu_features,
	181	PTRRELOC(&__start___lwsync_fixup),
	182	PTRRELOC(&__stop___lwsync_fixup));
	183
	184	#ifdef CONFIG_PPC64
a28e46f1	185	saved_firmware_features = powerpc_firmware_features;
9402c684 BH	186	do_feature_fixups(powerpc_firmware_features,
	187	&__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
	188	#endif
	189	do_final_fixups();
	190	}
	191
a28e46f1 ME	192	static int __init check_features(void)
	193	{
	194	WARN(saved_cpu_features != cur_cpu_spec->cpu_features,
	195	"CPU features changed after feature patching!\n");
	196	WARN(saved_mmu_features != cur_cpu_spec->mmu_features,
	197	"MMU features changed after feature patching!\n");
	198	#ifdef CONFIG_PPC64
	199	WARN(saved_firmware_features != powerpc_firmware_features,
	200	"Firmware features changed after feature patching!\n");
	201	#endif
	202
	203	return 0;
	204	}
	205	late_initcall(check_features);
	206
362e7701 ME	207	#ifdef CONFIG_FTR_FIXUP_SELFTEST
	208
	209	#define check(x) \
	210	if (!(x)) printk("feature-fixups: test failed at line %d\n", __LINE__);
	211
	212	/* This must be after the text it fixes up, vmlinux.lds.S enforces that atm */
	213	static struct fixup_entry fixup;
	214
	215	static long calc_offset(struct fixup_entry entry, unsigned int p)
	216	{
	217	return (unsigned long)p - (unsigned long)entry;
	218	}
	219
e51df2c1	220	static void test_basic_patching(void)
362e7701 ME	221	{
	222	extern unsigned int ftr_fixup_test1;
	223	extern unsigned int end_ftr_fixup_test1;
	224	extern unsigned int ftr_fixup_test1_orig;
	225	extern unsigned int ftr_fixup_test1_expected;
	226	int size = &end_ftr_fixup_test1 - &ftr_fixup_test1;
	227
	228	fixup.value = fixup.mask = 8;
	229	fixup.start_off = calc_offset(&fixup, &ftr_fixup_test1 + 1);
	230	fixup.end_off = calc_offset(&fixup, &ftr_fixup_test1 + 2);
	231	fixup.alt_start_off = fixup.alt_end_off = 0;
	232
	233	/* Sanity check */
	234	check(memcmp(&ftr_fixup_test1, &ftr_fixup_test1_orig, size) == 0);
	235
	236	/* Check we don't patch if the value matches */
	237	patch_feature_section(8, &fixup);
	238	check(memcmp(&ftr_fixup_test1, &ftr_fixup_test1_orig, size) == 0);
	239
	240	/* Check we do patch if the value doesn't match */
	241	patch_feature_section(0, &fixup);
	242	check(memcmp(&ftr_fixup_test1, &ftr_fixup_test1_expected, size) == 0);
	243
	244	/* Check we do patch if the mask doesn't match */
	245	memcpy(&ftr_fixup_test1, &ftr_fixup_test1_orig, size);
	246	check(memcmp(&ftr_fixup_test1, &ftr_fixup_test1_orig, size) == 0);
	247	patch_feature_section(~8, &fixup);
	248	check(memcmp(&ftr_fixup_test1, &ftr_fixup_test1_expected, size) == 0);
	249	}
	250
	251	static void test_alternative_patching(void)
	252	{
	253	extern unsigned int ftr_fixup_test2;
	254	extern unsigned int end_ftr_fixup_test2;
	255	extern unsigned int ftr_fixup_test2_orig;
	256	extern unsigned int ftr_fixup_test2_alt;
	257	extern unsigned int ftr_fixup_test2_expected;
	258	int size = &end_ftr_fixup_test2 - &ftr_fixup_test2;
	259
	260	fixup.value = fixup.mask = 0xF;
	261	fixup.start_off = calc_offset(&fixup, &ftr_fixup_test2 + 1);
	262	fixup.end_off = calc_offset(&fixup, &ftr_fixup_test2 + 2);
	263	fixup.alt_start_off = calc_offset(&fixup, &ftr_fixup_test2_alt);
	264	fixup.alt_end_off = calc_offset(&fixup, &ftr_fixup_test2_alt + 1);
	265
	266	/* Sanity check */
	267	check(memcmp(&ftr_fixup_test2, &ftr_fixup_test2_orig, size) == 0);
	268
	269	/* Check we don't patch if the value matches */
	270	patch_feature_section(0xF, &fixup);
	271	check(memcmp(&ftr_fixup_test2, &ftr_fixup_test2_orig, size) == 0);
	272
	273	/* Check we do patch if the value doesn't match */
	274	patch_feature_section(0, &fixup);
	275	check(memcmp(&ftr_fixup_test2, &ftr_fixup_test2_expected, size) == 0);
	276
	277	/* Check we do patch if the mask doesn't match */
	278	memcpy(&ftr_fixup_test2, &ftr_fixup_test2_orig, size);
	279	check(memcmp(&ftr_fixup_test2, &ftr_fixup_test2_orig, size) == 0);
	280	patch_feature_section(~0xF, &fixup);
	281	check(memcmp(&ftr_fixup_test2, &ftr_fixup_test2_expected, size) == 0);
	282	}
	283
	284	static void test_alternative_case_too_big(void)
285	{
286	extern unsigned int ftr_fixup_test3;
287	extern unsigned int end_ftr_fixup_test3;
288	extern unsigned int ftr_fixup_test3_orig;
289	extern unsigned int ftr_fixup_test3_alt;
290	int size = &end_ftr_fixup_test3 - &ftr_fixup_test3;
291
292	fixup.value = fixup.mask = 0xC;
293	fixup.start_off = calc_offset(&fixup, &ftr_fixup_test3 + 1);
294	fixup.end_off = calc_offset(&fixup, &ftr_fixup_test3 + 2);
295	fixup.alt_start_off = calc_offset(&fixup, &ftr_fixup_test3_alt);
296	fixup.alt_end_off = calc_offset(&fixup, &ftr_fixup_test3_alt + 2);
297
298	/* Sanity check */
299	check(memcmp(&ftr_fixup_test3, &ftr_fixup_test3_orig, size) == 0);
300
301	/* Expect nothing to be patched, and the error returned to us */
302	check(patch_feature_section(0xF, &fixup) == 1);
303	check(memcmp(&ftr_fixup_test3, &ftr_fixup_test3_orig, size) == 0);
304	check(patch_feature_section(0, &fixup) == 1);
305	check(memcmp(&ftr_fixup_test3, &ftr_fixup_test3_orig, size) == 0);
306	check(patch_feature_section(~0xF, &fixup) == 1);
307	check(memcmp(&ftr_fixup_test3, &ftr_fixup_test3_orig, size) == 0);
308	}
309
310	static void test_alternative_case_too_small(void)
311	{
312	extern unsigned int ftr_fixup_test4;
313	extern unsigned int end_ftr_fixup_test4;
314	extern unsigned int ftr_fixup_test4_orig;
315	extern unsigned int ftr_fixup_test4_alt;
316	extern unsigned int ftr_fixup_test4_expected;
317	int size = &end_ftr_fixup_test4 - &ftr_fixup_test4;
318	unsigned long flag;
319
320	/* Check a high-bit flag */
321	flag = 1UL << ((sizeof(unsigned long) - 1) * 8);
322	fixup.value = fixup.mask = flag;
323	fixup.start_off = calc_offset(&fixup, &ftr_fixup_test4 + 1);
324	fixup.end_off = calc_offset(&fixup, &ftr_fixup_test4 + 5);
325	fixup.alt_start_off = calc_offset(&fixup, &ftr_fixup_test4_alt);
326	fixup.alt_end_off = calc_offset(&fixup, &ftr_fixup_test4_alt + 2);
327
328	/* Sanity check */
329	check(memcmp(&ftr_fixup_test4, &ftr_fixup_test4_orig, size) == 0);
330
331	/* Check we don't patch if the value matches */
332	patch_feature_section(flag, &fixup);
333	check(memcmp(&ftr_fixup_test4, &ftr_fixup_test4_orig, size) == 0);
334
335	/* Check we do patch if the value doesn't match */
336	patch_feature_section(0, &fixup);
337	check(memcmp(&ftr_fixup_test4, &ftr_fixup_test4_expected, size) == 0);
338
339	/* Check we do patch if the mask doesn't match */
340	memcpy(&ftr_fixup_test4, &ftr_fixup_test4_orig, size);
341	check(memcmp(&ftr_fixup_test4, &ftr_fixup_test4_orig, size) == 0);
342	patch_feature_section(~flag, &fixup);
343	check(memcmp(&ftr_fixup_test4, &ftr_fixup_test4_expected, size) == 0);
344	}
345
346	static void test_alternative_case_with_branch(void)
347	{
348	extern unsigned int ftr_fixup_test5;
349	extern unsigned int end_ftr_fixup_test5;
350	extern unsigned int ftr_fixup_test5_expected;
351	int size = &end_ftr_fixup_test5 - &ftr_fixup_test5;
352
353	check(memcmp(&ftr_fixup_test5, &ftr_fixup_test5_expected, size) == 0);
354	}
355
356	static void test_alternative_case_with_external_branch(void)
357	{
358	extern unsigned int ftr_fixup_test6;
359	extern unsigned int end_ftr_fixup_test6;
360	extern unsigned int ftr_fixup_test6_expected;
361	int size = &end_ftr_fixup_test6 - &ftr_fixup_test6;
362
363	check(memcmp(&ftr_fixup_test6, &ftr_fixup_test6_expected, size) == 0);
364	}
365
366	static void test_cpu_macros(void)
367	{
3880ecb0 SR	368	extern u8 ftr_fixup_test_FTR_macros;
3880ecb0 SR	369	extern u8 ftr_fixup_test_FTR_macros_expected;
362e7701 ME	370	unsigned long size = &ftr_fixup_test_FTR_macros_expected -
	371	&ftr_fixup_test_FTR_macros;
	372
	373	/* The fixups have already been done for us during boot */
	374	check(memcmp(&ftr_fixup_test_FTR_macros,
	375	&ftr_fixup_test_FTR_macros_expected, size) == 0);
	376	}
	377
	378	static void test_fw_macros(void)
	379	{
	380	#ifdef CONFIG_PPC64
3880ecb0 SR	381	extern u8 ftr_fixup_test_FW_FTR_macros;
3880ecb0 SR	382	extern u8 ftr_fixup_test_FW_FTR_macros_expected;
362e7701 ME	383	unsigned long size = &ftr_fixup_test_FW_FTR_macros_expected -
	384	&ftr_fixup_test_FW_FTR_macros;
	385
	386	/* The fixups have already been done for us during boot */
	387	check(memcmp(&ftr_fixup_test_FW_FTR_macros,
	388	&ftr_fixup_test_FW_FTR_macros_expected, size) == 0);
	389	#endif
	390	}
	391
2d1b2027 KG	392	static void test_lwsync_macros(void)
2d1b2027 KG	393	{
3880ecb0 SR	394	extern u8 lwsync_fixup_test;
	395	extern u8 end_lwsync_fixup_test;
	396	extern u8 lwsync_fixup_test_expected_LWSYNC;
	397	extern u8 lwsync_fixup_test_expected_SYNC;
2d1b2027 KG	398	unsigned long size = &end_lwsync_fixup_test -
	399	&lwsync_fixup_test;
	400
	401	/* The fixups have already been done for us during boot */
	402	if (cur_cpu_spec->cpu_features & CPU_FTR_LWSYNC) {
	403	check(memcmp(&lwsync_fixup_test,
	404	&lwsync_fixup_test_expected_LWSYNC, size) == 0);
	405	} else {
	406	check(memcmp(&lwsync_fixup_test,
	407	&lwsync_fixup_test_expected_SYNC, size) == 0);
	408	}
	409	}
	410
362e7701 ME	411	static int __init test_feature_fixups(void)
	412	{
	413	printk(KERN_DEBUG "Running feature fixup self-tests ...\n");
	414
	415	test_basic_patching();
	416	test_alternative_patching();
	417	test_alternative_case_too_big();
	418	test_alternative_case_too_small();
	419	test_alternative_case_with_branch();
	420	test_alternative_case_with_external_branch();
	421	test_cpu_macros();
	422	test_fw_macros();
2d1b2027	423	test_lwsync_macros();
362e7701 ME	424
	425	return 0;
	426	}
	427	late_initcall(test_feature_fixups);
	428
	429	#endif /* CONFIG_FTR_FIXUP_SELFTEST */