192 	[GDT_ENTRY_KERNEL32_CS]		= GDT_ENTRY_INIT(DESC_CODE32, 0, 0xfffff),
193 	[GDT_ENTRY_KERNEL_CS]		= GDT_ENTRY_INIT(DESC_CODE64, 0, 0xfffff),
194 	[GDT_ENTRY_KERNEL_DS]		= GDT_ENTRY_INIT(DESC_DATA64, 0, 0xfffff),
195 	[GDT_ENTRY_DEFAULT_USER32_CS]	= GDT_ENTRY_INIT(DESC_CODE32 | DESC_USER, 0, 0xfffff),
196 	[GDT_ENTRY_DEFAULT_USER_DS]	= GDT_ENTRY_INIT(DESC_DATA64 | DESC_USER, 0, 0xfffff),
197 	[GDT_ENTRY_DEFAULT_USER_CS]	= GDT_ENTRY_INIT(DESC_CODE64 | DESC_USER, 0, 0xfffff),
199 	[GDT_ENTRY_KERNEL_CS]		= GDT_ENTRY_INIT(DESC_CODE32, 0, 0xfffff),
200 	[GDT_ENTRY_KERNEL_DS]		= GDT_ENTRY_INIT(DESC_DATA32, 0, 0xfffff),
201 	[GDT_ENTRY_DEFAULT_USER_CS]	= GDT_ENTRY_INIT(DESC_CODE32 | DESC_USER, 0, 0xfffff),
202 	[GDT_ENTRY_DEFAULT_USER_DS]	= GDT_ENTRY_INIT(DESC_DATA32 | DESC_USER, 0, 0xfffff),
208 	[GDT_ENTRY_PNPBIOS_CS32]	= GDT_ENTRY_INIT(DESC_CODE32_BIOS, 0, 0xffff),
209 	[GDT_ENTRY_PNPBIOS_CS16]	= GDT_ENTRY_INIT(DESC_CODE16, 0, 0xffff),
210 	[GDT_ENTRY_PNPBIOS_DS]		= GDT_ENTRY_INIT(DESC_DATA16, 0, 0xffff),
211 	[GDT_ENTRY_PNPBIOS_TS1]		= GDT_ENTRY_INIT(DESC_DATA16, 0, 0),
212 	[GDT_ENTRY_PNPBIOS_TS2]		= GDT_ENTRY_INIT(DESC_DATA16, 0, 0),
217 	[GDT_ENTRY_APMBIOS_BASE]	= GDT_ENTRY_INIT(DESC_CODE32_BIOS, 0, 0xffff),
218 	[GDT_ENTRY_APMBIOS_BASE+1]	= GDT_ENTRY_INIT(DESC_CODE16, 0, 0xffff),
219 	[GDT_ENTRY_APMBIOS_BASE+2]	= GDT_ENTRY_INIT(DESC_DATA32_BIOS, 0, 0xffff),
221 	[GDT_ENTRY_ESPFIX_SS]		= GDT_ENTRY_INIT(DESC_DATA32, 0, 0xfffff),
222 	[GDT_ENTRY_PERCPU]		= GDT_ENTRY_INIT(DESC_DATA32, 0, 0xfffff),
236 		return 0;  in x86_nopcid_setup()
240 	return 0;  in x86_nopcid_setup()
253 		return 0;  in x86_noinvpcid_setup()
257 	return 0;  in x86_noinvpcid_setup()
286 		      "popl %0		\n\t"  in flag_is_changeable_p()
287 		      "movl %0, %1	\n\t"  in flag_is_changeable_p()
288 		      "xorl %2, %0	\n\t"  in flag_is_changeable_p()
289 		      "pushl %0		\n\t"  in flag_is_changeable_p()
292 		      "popl %0		\n\t"  in flag_is_changeable_p()
298 	return ((f1^f2) & flag) != 0;  in flag_is_changeable_p()
317 	lo |= 0x200000;  in squash_the_stupid_serial_number()
324 	c->cpuid_level = cpuid_eax(0);  in squash_the_stupid_serial_number()
329 	disable_x86_serial_nr = 0;  in x86_serial_nr_setup()
393 	unsigned long bits_missing = 0;  in native_write_cr0()
396 	asm volatile("mov %0,%%cr0": "+r" (val) : : "memory");  in native_write_cr0()
412 	unsigned long bits_changed = 0;  in native_write_cr4()
415 	asm volatile("mov %0,%%cr4": "+r" (val) : : "memory");  in native_write_cr4()
424 		WARN_ONCE(bits_changed, "pinned CR4 bits changed: 0x%lx!?\n",  in native_write_cr4()
483 		return 0;  in x86_nofsgsbase_setup()
545 	u64 msr = 0;  in ibt_save()
590 		wrmsrl(MSR_IA32_S_CET, 0);  in setup_cet()
596 		wrmsrl(MSR_IA32_S_CET, 0);  in setup_cet()
607 	wrmsrl(MSR_IA32_S_CET, 0);  in cet_disable()
608 	wrmsrl(MSR_IA32_U_CET, 0);  in cet_disable()
623 	{ X86_FEATURE_MWAIT,		0x00000005 },
624 	{ X86_FEATURE_DCA,		0x00000009 },
625 	{ X86_FEATURE_XSAVE,		0x0000000d },
626 	{ 0, 0 }
639 		 * extended_extended_level is set to 0 if unavailable  in filter_cpuid_features()
644 		if (!((s32)df->level < 0 ?  in filter_cpuid_features()
653 		pr_warn("CPU: CPU feature " X86_CAP_FMT " disabled, no CPUID level 0x%x\n",  in filter_cpuid_features()
661  * in particular, if CPUID levels 0x80000002..4 are supported, this
745 	 * per CPU stack canary is 0 in both per CPU areas.  in switch_gdt_and_percpu_base()
767 	if (c->extended_cpuid_level < 0x80000004)  in get_model_name()
771 	cpuid(0x80000002, &v[0], &v[1], &v[2], &v[3]);  in get_model_name()
772 	cpuid(0x80000003, &v[4], &v[5], &v[6], &v[7]);  in get_model_name()
773 	cpuid(0x80000004, &v[8], &v[9], &v[10], &v[11]);  in get_model_name()
774 	c->x86_model_id[48] = 0;  in get_model_name()
777 	p = q = s = &c->x86_model_id[0];  in get_model_name()
790 	*(s + 1) = '\0';  in get_model_name()
801 	cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);  in detect_num_cpu_cores()
802 	if (eax & 0x1f)  in detect_num_cpu_cores()
812 	if (n >= 0x80000005) {  in cpu_detect_cache_sizes()
813 		cpuid(0x80000005, &dummy, &ebx, &ecx, &edx);  in cpu_detect_cache_sizes()
817 		c->x86_tlbsize = 0;  in cpu_detect_cache_sizes()
821 	if (n < 0x80000006)	/* Some chips just has a large L1. */  in cpu_detect_cache_sizes()
824 	cpuid(0x80000006, &dummy, &ebx, &ecx, &edx);  in cpu_detect_cache_sizes()
828 	c->x86_tlbsize += ((ebx >> 16) & 0xfff) + (ebx & 0xfff);  in cpu_detect_cache_sizes()
838 	if (l2size == 0)  in cpu_detect_cache_sizes()
883 	smp_num_siblings = (ebx & 0xff0000) >> 16;  in detect_ht_early()
887 	return 0;  in detect_ht_early()
895 	if (detect_ht_early(c) < 0)  in detect_ht()
917 	for (i = 0; i < X86_VENDOR_NUM; i++) {  in get_cpu_vendor()
921 		if (!strcmp(v, cpu_devs[i]->c_ident[0]) ||  in get_cpu_vendor()
941 	cpuid(0x00000000, (unsigned int *)&c->cpuid_level,  in cpu_detect()
942 	      (unsigned int *)&c->x86_vendor_id[0],  in cpu_detect()
947 	/* Intel-defined flags: level 0x00000001 */  in cpu_detect()
948 	if (c->cpuid_level >= 0x00000001) {  in cpu_detect()
951 		cpuid(0x00000001, &tfms, &misc, &junk, &cap0);  in cpu_detect()
957 			c->x86_clflush_size = ((misc >> 8) & 0xff) * 8;  in cpu_detect()
967 	for (i = 0; i < NCAPINTS + NBUGINTS; i++) {  in apply_forced_caps()
1018 	/* Intel-defined flags: level 0x00000001 */  in get_cpu_cap()
1019 	if (c->cpuid_level >= 0x00000001) {  in get_cpu_cap()
1020 		cpuid(0x00000001, &eax, &ebx, &ecx, &edx);  in get_cpu_cap()
1026 	/* Thermal and Power Management Leaf: level 0x00000006 (eax) */  in get_cpu_cap()
1027 	if (c->cpuid_level >= 0x00000006)  in get_cpu_cap()
1028 		c->x86_capability[CPUID_6_EAX] = cpuid_eax(0x00000006);  in get_cpu_cap()
1030 	/* Additional Intel-defined flags: level 0x00000007 */  in get_cpu_cap()
1031 	if (c->cpuid_level >= 0x00000007) {  in get_cpu_cap()
1032 		cpuid_count(0x00000007, 0, &eax, &ebx, &ecx, &edx);  in get_cpu_cap()
1039 			cpuid_count(0x00000007, 1, &eax, &ebx, &ecx, &edx);  in get_cpu_cap()
1044 	/* Extended state features: level 0x0000000d */  in get_cpu_cap()
1045 	if (c->cpuid_level >= 0x0000000d) {  in get_cpu_cap()
1046 		cpuid_count(0x0000000d, 1, &eax, &ebx, &ecx, &edx);  in get_cpu_cap()
1051 	/* AMD-defined flags: level 0x80000001 */  in get_cpu_cap()
1052 	eax = cpuid_eax(0x80000000);  in get_cpu_cap()
1055 	if ((eax & 0xffff0000) == 0x80000000) {  in get_cpu_cap()
1056 		if (eax >= 0x80000001) {  in get_cpu_cap()
1057 			cpuid(0x80000001, &eax, &ebx, &ecx, &edx);  in get_cpu_cap()
1064 	if (c->extended_cpuid_level >= 0x80000007) {  in get_cpu_cap()
1065 		cpuid(0x80000007, &eax, &ebx, &ecx, &edx);  in get_cpu_cap()
1071 	if (c->extended_cpuid_level >= 0x80000008) {  in get_cpu_cap()
1072 		cpuid(0x80000008, &eax, &ebx, &ecx, &edx);  in get_cpu_cap()
1076 	if (c->extended_cpuid_level >= 0x8000000a)  in get_cpu_cap()
1077 		c->x86_capability[CPUID_8000_000A_EDX] = cpuid_edx(0x8000000a);  in get_cpu_cap()
1079 	if (c->extended_cpuid_level >= 0x8000001f)  in get_cpu_cap()
1080 		c->x86_capability[CPUID_8000_001F_EAX] = cpuid_eax(0x8000001f);  in get_cpu_cap()
1082 	if (c->extended_cpuid_level >= 0x80000021)  in get_cpu_cap()
1083 		c->x86_capability[CPUID_8000_0021_EAX] = cpuid_eax(0x80000021);  in get_cpu_cap()
1102 	    (c->extended_cpuid_level < 0x80000008))  in get_cpu_address_sizes()
1106 		cpuid(0x80000008, &eax, &ebx, &ecx, &edx);  in get_cpu_address_sizes()
1108 		c->x86_virt_bits = (eax >> 8) & 0xff;  in get_cpu_address_sizes()
1109 		c->x86_phys_bits = eax & 0xff;  in get_cpu_address_sizes()
1143 	for (i = 0; i < X86_VENDOR_NUM; i++)  in identify_cpu_without_cpuid()
1145 			c->x86_vendor_id[0] = 0;  in identify_cpu_without_cpuid()
1147 			if (c->x86_vendor_id[0]) {  in identify_cpu_without_cpuid()
1155 #define NO_SPECULATION		BIT(0)
1227 	/* AMD Family 0xf - 0x12 */
1228 	VULNWL_AMD(0x0f,	NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS | NO_SWAPGS | NO_ITLB_MULTIHIT | NO_MMIO),
1229 	VULNWL_AMD(0x10,	NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS | NO_SWAPGS | NO_ITLB_MULTIHIT | NO_MMIO),
1230 	VULNWL_AMD(0x11,	NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS | NO_SWAPGS | NO_ITLB_MULTIHIT | NO_MMIO),
1231 	VULNWL_AMD(0x12,	NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS | NO_SWAPGS | NO_ITLB_MULTIHIT | NO_MMIO),
1233 	/* FAMILY_ANY must be last, otherwise 0x0f - 0x12 matches won't work */
1257 #define SRBDS		BIT(0)
1291 	VULNBL_INTEL_STEPPINGS(COMETLAKE_L,	X86_STEPPINGS(0x0, 0x0),	MMIO | RETBLEED),
1301 	VULNBL_AMD(0x15, RETBLEED),
1302 	VULNBL_AMD(0x16, RETBLEED),
1303 	VULNBL_AMD(0x17, RETBLEED | SMT_RSB | SRSO),
1304 	VULNBL_HYGON(0x18, RETBLEED | SMT_RSB | SRSO),
1305 	VULNBL_AMD(0x19, SRSO),
1318 	u64 ia32_cap = 0;  in x86_read_arch_cap_msr()
1377 	 * When the CPU is not mitigated for TAA (TAA_NO=0) set TAA bug when:  in cpu_set_bug_bits()
1485 	int arglen, taint = 0;  in cpu_parse_early_param()
1512 	if (arglen <= 0)  in cpu_parse_early_param()
1546 		for (bit = 0; bit < 32 * NCAPINTS; bit++) {  in cpu_parse_early_param()
1580 	memset(&c->x86_capability, 0, sizeof(c->x86_capability));  in early_identify_cpu()
1581 	c->extended_cpuid_level = 0;  in early_identify_cpu()
1598 		c->cpu_index = 0;  in early_identify_cpu()
1643 	int count = 0;  in early_cpu_init()
1661 			for (j = 0; j < 2; j++) {  in early_cpu_init()
1693 	loadsegment(fs, 0);  in detect_null_seg_behavior()
1696 	return tmp == 0;  in detect_null_seg_behavior()
1722 	 * 0x18 is the respective family for Hygon.  in check_null_seg_clears_base()
1724 	if ((c->x86 == 0x17 || c->x86 == 0x18) &&  in check_null_seg_clears_base()
1734 	c->extended_cpuid_level = 0;  in generic_identify()
1751 	if (c->cpuid_level >= 0x00000001) {  in generic_identify()
1752 		c->topo.initial_apicid = (cpuid_ebx(1) >> 24) & 0xFF;  in generic_identify()
1755 		c->topo.apicid = apic->phys_pkg_id(c->topo.initial_apicid, 0);  in generic_identify()
1767 	 * systems that run Linux at CPL > 0 may or may not have the  in generic_identify()
1802 	c->topo.logical_pkg_id = 0;  in validate_apic_and_package_id()
1814 	c->x86_cache_size = 0;  in identify_cpu()
1816 	c->x86_model = c->x86_stepping = 0;	/* So far unknown... */  in identify_cpu()
1817 	c->x86_vendor_id[0] = '\0'; /* Unset */  in identify_cpu()
1818 	c->x86_model_id[0] = '\0';  /* Unset */  in identify_cpu()
1820 	c->x86_coreid_bits = 0;  in identify_cpu()
1821 	c->topo.cu_id = 0xff;  in identify_cpu()
1835 	memset(&c->x86_capability, 0, sizeof(c->x86_capability));  in identify_cpu()
1837 	memset(&c->vmx_capability, 0, sizeof(c->vmx_capability));  in identify_cpu()
1849 	c->topo.apicid = apic->phys_pkg_id(c->topo.initial_apicid, 0);  in identify_cpu()
1895 	if (!c->x86_model_id[0]) {  in identify_cpu()
1928 		for (i = 0; i < NCAPINTS; i++)  in identify_cpu()
1970 	wrmsr(MSR_IA32_SYSENTER_CS, tss->x86_tss.ss1, 0);  in enable_sep_cpu()
1971 	wrmsr(MSR_IA32_SYSENTER_ESP, (unsigned long)(cpu_entry_stack(cpu) + 1), 0);  in enable_sep_cpu()
1972 	wrmsr(MSR_IA32_SYSENTER_EIP, (unsigned long)entry_SYSENTER_32, 0);  in enable_sep_cpu()
2017 		if (c->cpuid_level >= 0)  in print_cpu_info()
2024 	if (c->x86_model_id[0])  in print_cpu_info()
2029 	pr_cont(" (family: 0x%x, model: 0x%x", c->x86, c->x86_model);  in print_cpu_info()
2031 	if (c->x86_stepping || c->cpuid_level >= 0)  in print_cpu_info()
2032 		pr_cont(", stepping: 0x%x)\n", c->x86_stepping);  in print_cpu_info()
2073 	wrmsr(MSR_STAR, 0, (__USER32_CS << 16) | __KERNEL_CS);  in syscall_init()
2091 		wrmsrl_safe(MSR_IA32_SYSENTER_ESP, 0ULL);  in syscall_init()
2092 		wrmsrl_safe(MSR_IA32_SYSENTER_EIP, 0ULL);  in syscall_init()
2123 	for (i = 0; i < 8; i++) {  in clear_all_debug_regs()
2128 		set_debugreg(0, i);  in clear_all_debug_regs()
2152 		wrmsr(MSR_TSC_AUX, cpudata, 0);  in setup_getcpu()
2187 	tss->io_bitmap.prev_max = 0;  in tss_setup_io_bitmap()
2188 	tss->io_bitmap.prev_sequence = 0;  in tss_setup_io_bitmap()
2189 	memset(tss->io_bitmap.bitmap, 0xff, sizeof(tss->io_bitmap.bitmap));  in tss_setup_io_bitmap()
2194 	tss->io_bitmap.mapall[IO_BITMAP_LONGS] = ~0UL;  in tss_setup_io_bitmap()
2236 	if (this_cpu_read(numa_node) == 0 &&  in cpu_init()
2247 		loadsegment(fs, 0);  in cpu_init()
2248 		memset(cur->thread.tls_array, 0, GDT_ENTRY_TLS_ENTRIES * 8);  in cpu_init()
2251 		wrmsrl(MSR_FS_BASE, 0);  in cpu_init()
2252 		wrmsrl(MSR_KERNEL_GS_BASE, 0);  in cpu_init()
2293 	curr_info->cpuid_level = cpuid_eax(0);  in store_cpu_caps()
2370 			'0' + (boot_cpu_data.x86 > 6 ? 6 : boot_cpu_data.x86);  in arch_cpu_finalize_init()
2392 			set_memory_4k((unsigned long)__va(0), 1);  in arch_cpu_finalize_init()