Lines Matching +full:0 +full:x86
12 acpi= [HW,ACPI,X86,ARM64,RISCV64,EARLY]
40 1,0: use 1st APIC table
41 default: 0
81 acpi.debug_layer=0x20000000
84 acpi.debug_layer=0xffffffff acpi.debug_level=0x2
86 acpi.debug_layer=0x2 acpi.debug_level=0xffffffff
110 By default, this is disabled due to x86 early mapping
234 acpi_pm_good [X86]
281 add_efi_memmap [EFI,X86,EARLY] Include EFI memory map in
295 behaviour to be specified. Bit 0 enables warnings,
298 align_va_addr= [X86-64]
329 amd_iommu= [HW,X86-64]
352 amd_iommu_dump= [HW,X86-64]
358 amd_iommu_intr= [HW,X86-64]
367 amd_pstate= [X86,EARLY]
380 to bias toward performance (0x0) or energy efficiency (0xff)
391 [X86]
412 apic [APIC,X86-64] Use IO-APIC. Default.
414 apic= [APIC,X86,EARLY] Advanced Programmable Interrupt Controller
419 For X86-32, this can also be used to specify an APIC
424 apic_extnmi= [APIC,X86,EARLY] External NMI delivery setting
426 bsp: External NMI is delivered only to CPU 0
428 backup of CPU 0
441 See header of arch/x86/kernel/apm_32.c.
444 Format: { "0" | "1" }
446 0 -- disable.
493 Format: <bool> (0 = real, 1 = synthetic (default))
499 Format: { "0" | "1" | "off" | "on" }
500 0 | off - kernel audit is disabled and can not be
511 Format: <int> (must be >=0)
515 behavior is to disable the BAU (i.e. bau=0).
516 Format: { "0" | "1" }
517 0 - Disable the BAU.
553 bgrt_disable [ACPI,X86,EARLY]
586 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
604 algorithm. Accepted values range from 0 to 7
648 Format: { "0" | "1" }
650 0 -- check protection applied by kernel (includes
661 clearcpuid=X[,X...] [X86]
663 arch/x86/include/asm/cpufeatures.h for the valid bit
691 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
708 [X86-32] pit,hpet,tsc;
715 [X86-64] hpet,tsc
746 memory allocations. A value of 0 disables CMA
753 contiguous memory allocations. A value of 0 disables
755 specified, the default value is 0.
798 Format: y|n|Y|N|1|0
848 uart[8250],0x<addr>[,options]
888 seconds. A value of 0 disables the blank timer.
889 Defaults to 0.
900 0: default value, disable debugging
922 [X86,EARLY] Delay for N microsec between assert and de-assert
951 [KNL, X86-64, ARM64, RISCV, LoongArch] Select a region
964 [KNL, X86-64, ARM64, RISCV, LoongArch] range could be
972 [KNL, X86-64, ARM64, RISCV, LoongArch] range under 4G.
981 --> x86: max(swiotlb_size_or_default() + 8MiB, 256MiB)
987 0: to disable low allocation.
1032 Bitmask for the various LOCKTYPE_ tests. Defaults to 0
1082 debugpat [X86] Enable PAT debugging
1100 of 0 will timeout at the end of initcalls. If the time
1170 disable_mtrr_cleanup [X86,EARLY]
1175 disable_mtrr_trim [X86, Intel and AMD only,EARLY]
1181 disable_timer_pin_1 [X86,EARLY]
1185 dis_ucode_ldr [X86] Disable the microcode loader.
1205 [X86] Controls mitigation for Register File Data
1254 dump_apple_properties [X86]
1256 x86 Macs. Useful for driver authors to determine
1288 uart[8250],0x<addr>[,options]
1396 coherent non-x86 systems that use system memory for
1406 earlyprintk= [X86,SH,ARM,M68k,S390,UM,EARLY]
1411 earlyprintk=serial[,0x...[,baudrate]]
1430 on some architectures (x86 and arm at least) by
1432 earlyprintk=serial,0x1008,115200
1485 efi_no_storage_paranoia [EFI,X86,EARLY]
1491 efivar_ssdt= [EFI; X86] Name of an EFI variable that contains an SSDT
1501 ekgdboc= [X86,KGDB,EARLY] Allow early kernel console debugging
1512 elanfreq= [X86-32]
1514 arch/x86/kernel/cpu/cpufreq/elanfreq.c.
1516 elfcorehdr=[size[KMG]@]offset[KMG] [PPC,SH,X86,S390,EARLY]
1522 enable_mtrr_cleanup [X86,EARLY]
1527 enable_timer_pin_1 [X86]
1534 Format: {"0" | "1"}
1536 0 -- permissive (log only, no denials).
1538 Default value is 0.
1580 forcepae [X86-32]
1587 fred= [X86-64]
1668 in the tracefs tracing directory. default: 0 (no limit)
1715 gart_fix_e820= [X86-64,EARLY] disable the fix e820 for K8 GART
1720 [X86,INTEL,EARLY] Control the Gather Data Sampling (GDS)
1739 gbpages [X86] Use GB pages for kernel direct mappings.
1747 goldfish [X86] Enable the goldfish android emulator platform.
1762 grcan.enable0= [HW] Configuration of physical interface 0. Determines
1763 the "Enable 0" bit of the configuration register.
1764 Format: 0 | 1
1765 Default: 0
1767 the "Enable 0" bit of the configuration register.
1768 Format: 0 | 1
1769 Default: 0
1771 Format: 0 | 1
1772 Default: 0
1774 Format: <unsigned int> such that (txsize & ~0x1fffc0) == 0.
1777 Format: <unsigned int> such that (rxsize & ~0x1fffc0) == 0.
1794 Format: 0 | 1
1799 Format: 0 | 1 (for off | on)
1853 hpet= [X86-32,HPET] option to control HPET usage
1861 hpet_mmap= [X86, HPET_MMAP] Allow userspace to mmap HPET
1917 Format: 0 | 1
1926 terminal devices. Valid values: 0..8
1931 hv_nopvspin [X86,HYPER_V,EARLY]
1942 i2c_touchscreen_props= [HW,ACPI,X86]
1946 submit a drivers/platform/x86/touchscreen_dmi.c patch
1985 Format: { 1 | Y | y | 0 | N | n }
1987 0, N, n: don't ever reset controller
1988 Default: only on s2r transitions on x86; most other
2000 brightness value of 0 indicates backlight switched off,
2002 to maximum brightness. If this parameter is set to 0
2004 is set to 1, a brightness value of 0 sets the backlight
2008 0 -- machine default
2011 ia32_emulation= [X86-64]
2021 idle= [X86,EARLY]
2049 for the device. By default it is set to false (0).
2109 owned by uid=0.
2130 mode bit set by either the effective uid (euid=0) or
2131 uid=0.
2152 opened for read by uid=0.
2213 Default is 0, 0
2217 Format: 0 | 1
2221 Format: 0 | 1
2224 init_pkru= [X86] Specify the default memory protection keys rights
2225 register contents for all processes. 0x55555554 by
2226 default (disallow access to all but pkey 0). Can
2232 int_pln_enable [X86] Enable power limit notification interrupt
2235 Format: { "0" | "1" }
2236 0 -- basic integrity auditing messages. (Default)
2272 intel_idle.max_cstate= [KNL,HW,ACPI,X86]
2273 0 disables intel_idle and fall back on acpi_idle.
2276 intel_pstate= [X86,EARLY]
2320 intremap= [X86-64,Intel-IOMMU,EARLY]
2334 iommu= [X86,EARLY]
2359 [X86]
2361 [X86]
2367 [X86]
2402 iommu.forcedac= [ARM64,X86,EARLY] Control IOVA allocation for PCI devices.
2403 Format: { "0" | "1" }
2404 0 - Try to allocate a 32-bit DMA address first, before
2410 iommu.strict= [ARM64,X86,S390,EARLY] Configure TLB invalidation behaviour
2411 Format: { "0" | "1" }
2412 0 - Lazy mode.
2422 Note: on x86, strict mode specified via one of the
2426 [ARM64,X86,EARLY] Configure DMA to bypass the IOMMU by default.
2427 Format: { "0" | "1" }
2428 0 - Use IOMMU translation for DMA.
2436 io_delay= [X86,EARLY] I/O delay method
2437 0x80
2438 Standard port 0x80 based delay
2439 0xed
2440 Alternate port 0xed based delay (needed on some systems)
2454 Determine whether IPE starts in permissive (0) or
2462 is 0.
2535 <cpu number> begins at 0 and the maximum value is
2566 ivrs_ioapic [HW,X86-64]
2569 By default, PCI segment is 0, and can be omitted.
2572 PCI segment 0x1 and PCI device 00:14.0,
2580 * To map IOAPIC-ID decimal 10 to PCI segment 0x1 and
2584 ivrs_hpet [HW,X86-64]
2587 By default, PCI segment is 0, and can be omitted.
2590 PCI segment 0x1 and PCI device 00:14.0,
2595 * To map HPET-ID decimal 0 to PCI device 00:14.0
2597 ivrs_hpet[0]=00:14.0
2598 * To map HPET-ID decimal 10 to PCI segment 0x1 and
2602 ivrs_acpihid [HW,X86-64]
2605 By default, PCI segment is 0, and can be omitted.
2607 For example, to map UART-HID:UID AMD0020:0 to
2608 PCI segment 0x1 and PCI device ID 00:14.5,
2610 ivrs_acpihid=AMD0020:0@0001:00:14.5
2613 * To map UART-HID:UID AMD0020:0 to PCI segment is 0,
2615 ivrs_acpihid[00:14.5]=AMD0020:0
2616 * To map UART-HID:UID AMD0020:0 to PCI segment 0x1 and
2618 ivrs_acpihid[0001:00:14.5]=AMD0020:0
2637 kernelcore= [KNL,X86,PPC,EARLY]
2727 0: force disabled
2737 Default is 0 (don't ignore, but inject #GP)
2740 [KVM,X86] Controls whether or not KVM will try to
2764 kvm.enable_virt_at_load=[KVM,ARM64,LOONGARCH,MIPS,RISCV,X86]
2771 VMs, i.e. on the 0=>1 and 1=>0 transitions of the
2775 latency for creation of the 0=>1 VM, as KVM serializes
2799 back to huge pages. 0 disables the recovery, otherwise if
2807 If the value is 0 (the default), KVM will pick a period based
2838 "arm64_sw.hvhe=0 id_aa64mmfr1.vh=0" to the
2844 [KVM,ARM,EARLY] Trap guest accesses to GICv3 group-0
2930 l1d_flush= [X86,INTEL,EARLY]
2947 l1tf= [X86,EARLY] Control mitigation of the L1TF vulnerability on
3016 lapic [X86-32,APIC,EARLY] Enable the local APIC even if BIOS
3019 lapic= [X86,APIC] Do not use TSC deadline
3024 lapic_timer_c2_ok [X86,APIC,EARLY] trust the local apic timer
3028 libata.dma=0 Disable all PATA and SATA DMA
3036 libata.ignore_hpa=0 keep BIOS limits (default)
3054 number of 0 either selects the first device or the
3069 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
3176 in progress at any given time. Defaults to 0,
3182 to 100 milliseconds. Select 0 to disable.
3208 boosting. Select 0 to disable, 1 to boost
3263 0 (KERN_EMERG) system is unusable
3287 lp=0 [LP] Specify parallel ports to use, e.g,
3289 lp=reset first parallel port). 'lp=0' disables the
3307 CPU). 0 enables autodetection (default). To determine
3329 will bring up during bootup. maxcpus=n : n >= 0 limits
3334 While n=0 is a special case, it is equivalent to "nosmp",
3344 mce= [X86-{32,64}]
3346 Please see Documentation/arch/x86/x86_64/machinecheck.rst for sysfs runtime tunables.
3399 checks. 0 to disable.
3423 mds= [X86,INTEL,EARLY]
3456 Must be specified, otherwise memory size will be 0.
3474 [X86] Work as limiting max address. Use together
3491 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
3508 memmap=exactmap [KNL,X86,EARLY] Enable setting of an exact
3515 [KNL, X86,MIPS,XTENSA,EARLY] Force usage of a specific region of memory.
3531 Example: Exclude memory from 0x18690000-0x1869ffff
3532 memmap=64K$0x18690000
3534 memmap=0x10000$0x18690000
3540 [KNL,X86] Mark specific memory as protected.
3542 The memory region may be marked as e820 type 12 (0xc)
3554 memory_corruption_check=0/1 [X86,EARLY]
3566 memory_corruption_check_size=size [X86,EARLY]
3572 memory_corruption_check_period=seconds [X86,EARLY]
3575 other rate. 0 disables periodic checking.
3578 [KNL,X86,ARM] Boolean flag to enable this feature.
3596 memtest= [KNL,X86,ARM,M68K,PPC,RISCV,EARLY] Enable memtest
3598 default : 0 <disable>
3606 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
3612 Refer to Documentation/virt/kvm/x86/amd-memory-encryption.rst
3621 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
3628 microcode.force_minrev= [X86]
3634 Format:[0..2][b][c][t]
3635 Default: "0tb"
3637 0 - The attached screen is the 3.5" TFT
3655 [X86,PPC,S390,ARM64,EARLY] Control optional mitigations for
3667 Equivalent to: if nokaslr then kpti=0 [ARM64]
3668 gather_data_sampling=off [X86]
3669 kvm.nx_huge_pages=off [X86]
3670 l1tf=off [X86]
3671 mds=off [X86]
3672 mmio_stale_data=off [X86]
3675 nobp=0 [S390]
3676 nopti [X86,PPC]
3678 nospectre_v1 [X86,PPC]
3679 nospectre_v2 [X86,PPC,S390,ARM64]
3680 reg_file_data_sampling=off [X86]
3681 retbleed=off [X86]
3682 spec_rstack_overflow=off [X86]
3683 spec_store_bypass_disable=off [X86,PPC]
3684 spectre_bhi=off [X86]
3685 spectre_v2_user=off [X86]
3686 srbds=off [X86,INTEL]
3688 tsx_async_abort=off [X86]
3707 Equivalent to: l1tf=flush,nosmt [X86]
3708 mds=full,nosmt [X86]
3709 tsx_async_abort=full,nosmt [X86]
3710 mmio_stale_data=full,nosmt [X86]
3711 retbleed=auto,nosmt [X86]
3717 of 0 disables mminit logging and a level of 4 will
3722 [X86,INTEL,EARLY] Control mitigation for the Processor
3797 movablecore= [KNL,X86,PPC,EARLY]
3827 mtrr=debug [X86,EARLY]
3831 mtrr_chunk_size=nn[KMG,X86,EARLY]
3835 mtrr_gran_size=nn[KMG,X86,EARLY]
3841 mtrr_spare_reg_nr=n [X86,EARLY]
3843 Range: 0,7 : spare reg number
3868 0 to disable accounting
3870 Default value is 0.
3894 and the specified value is >= 0.
3933 To turn off this behaviour, set the value to '0'.
3950 The default parameter value of '0' causes the kernel
3965 Setting this to value to 0 causes the kernel to use
4007 nmi_watchdog= [KNL,BUGS=X86] Debugging features for SMP kernels
4009 Valid num: 0 or 1
4010 0 - turn hardlockup detector in nmi_watchdog off
4012 rNNN - configure the watchdog with raw perf event 0xNNN
4025 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
4032 no5lvl [X86-64,RISCV,EARLY] Disable 5-level paging mode. Forces
4040 noapictimer [APIC,X86] Don't set up the APIC timer
4070 noexec32 [X86-64]
4083 nofsgsbase [X86] Disables FSGSBASE instructions.
4085 nofxsr [BUGS=X86-32] Disables x86 floating point extended
4089 nogbpages [X86] Do not use GB pages for kernel direct mappings.
4117 nohpet [X86] Don't use the HPET timer.
4119 nohugeiomap [KNL,X86,PPC,ARM64,EARLY] Disable kernel huge I/O mappings.
4121 nohugevmalloc [KNL,X86,PPC,ARM64,EARLY] Disable kernel huge vmalloc mappings.
4143 nointremap [X86-64,Intel-IOMMU,EARLY] Do not enable interrupt
4147 noinvpcid [X86,EARLY] Disable the INVPCID cpu feature.
4151 noirqdebug [X86-32] Disables the code which attempts to detect and
4161 no-kvmapf [X86,KVM,EARLY] Disable paravirtualized asynchronous page
4164 no-kvmclock [X86,KVM,EARLY] Disable paravirtualized KVM clock driver
4166 nolapic [X86-32,APIC,EARLY] Do not enable or use the local APIC.
4168 nolapic_timer [X86-32,APIC,EARLY] Do not use the local APIC timer.
4170 nomce [X86-32] Disable Machine Check Exception
4172 nomfgpt [X86-32] Disable Multi-Function General Purpose
4187 nonmi_ipi [X86] Disable using NMI IPIs during panic/reboot to
4191 nopat [X86,EARLY] Disable PAT (page attribute table extension of
4194 nopcid [X86-64,EARLY] Disable the PCID cpu feature.
4196 nopku [X86] Disable Memory Protection Keys CPU feature found
4199 nopti [X86-64,EARLY]
4202 nopv= [X86,XEN,KVM,HYPER_V,VMWARE,EARLY]
4207 nopvspin [X86,XEN,KVM,EARLY]
4213 echo 0 > /proc/sys/kernel/randomize_va_space
4215 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
4225 nosgx [X86-64,SGX,EARLY] Disables Intel SGX kernel support.
4236 and disable the IO APIC. legacy for "maxcpus=0".
4241 [KNL,X86,PPC] Disable symmetric multithreading (SMT).
4255 nospectre_v1 [X86,PPC,EARLY] Disable mitigations for Spectre Variant 1
4259 nospectre_v2 [X86,PPC_E500,ARM64,EARLY] Disable all mitigations
4264 no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES,RISCV,LOONGARCH,EARLY]
4270 no_timer_check [X86,APIC] Disables the code which tests for broken
4290 [X86,PV_OPS,EARLY] Disable paravirtualized VMware
4298 nox2apic [X86-64,APIC,EARLY] Do not enable x2APIC mode.
4304 noxsave [BUGS=X86] Disables x86 extended register state save
4308 noxsaveopt [X86] Disables xsaveopt used in saving x86 extended
4315 noxsaves [X86] Disables xsaves and xrstors used in saving and
4316 restoring x86 extended register state in compacted
4334 numa=off [KNL, ARM64, PPC, RISCV, SPARC, X86, EARLY]
4339 [KNL, ARM64, RISCV, X86, EARLY]
4344 [KNL, ARM64, RISCV, X86, EARLY]
4349 [KNL, ARM64, RISCV, X86, EARLY]
4353 numa=noacpi [X86] Don't parse the SRAT table for NUMA setup
4355 numa=nohmat [X86] Don't parse the HMAT table for NUMA setup, or
4358 numa_balancing= [KNL,ARM64,PPC,RISCV,S390,X86] Enable or disable automatic
4381 omap_mux=i2c2_scl.i2c2_scl=0x100,i2c2_sda.i2c2_sda=0x100
4391 1 indicates lock status, 0 indicates unlock status.
4427 timeout > 0: seconds before rebooting
4428 timeout = 0: wait forever
4429 timeout < 0: reboot immediately
4451 bit 0: print all tasks info
4465 connected to, default is 0.
4468 0 for XT, 1 for AT (default is AT).
4471 parport= [HW,PPT] Specify parallel ports. 0 disables.
4472 Format: { 0 | auto | 0xBBB[,IRQ[,DMA]] }
4519 for the respective channel. Bit 0 is for the first
4544 Bit 0 is for mode 0, bit 1 is for mode 1, and so on.
4556 options up to 6 legacy ports are supported: 0x1f0,
4557 0x170, 0x1e8, 0x168, 0x1e0, 0x160, however probing
4559 corresponding bits in the mask to 1. Bit 0 is for
4560 the first port in the list above (0x1f0), and so on.
4566 set to 1 if CONFIG_PATA_QDI_MODULE, 0 otherwise.
4571 the standard I/O port (0x130) if 1, otherwise the
4572 value given is the I/O port to use (typically 0x1b0).
4574 0 otherwise.
4579 the use of the respective PIO modes. Bit 0 is for
4580 mode 0, bit 1 is for mode 1, and so on. Mode 0 only
4616 off [X86] don't probe for the PCI bus
4617 bios [X86-32] force use of PCI BIOS, don't access
4620 nobios [X86-32] disallow use of PCI BIOS, only direct
4624 conf1 [X86] Force use of PCI Configuration Access
4625 Mechanism 1 (config address in IO port 0xCF8,
4626 data in IO port 0xCFC, both 32-bit).
4627 conf2 [X86] Force use of PCI Configuration Access
4628 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
4629 the function, IO port 0xCFA, also 8-bit, sets
4631 through ports 0xC000-0xCFFF).
4639 nommconf [X86] Disable use of MMCONFIG for PCI
4641 check_enable_amd_mmconf [X86] check for and enable
4658 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
4666 rom [X86] Assign address space to expansion ROMs.
4670 norom [X86] Do not assign address space to
4673 nobar [X86] Do not assign address space to the
4675 irqmask=0xMMMM [X86] Set a bit mask of IRQs allowed to be
4679 pirqaddr=0xAAAAA [X86] Specify the physical address
4683 lastbus=N [X86] Scan all buses thru bus #N. Can be
4687 assign-busses [X86] Always assign all PCI bus
4690 usepirqmask [X86] Honor the possible IRQ mask stored
4696 noacpi [X86] Do not use ACPI for IRQ routing
4698 use_crs [X86] Use PCI host bridge window information
4702 nocrs [X86] Ignore PCI host bridge windows from ACPI.
4704 use_e820 [X86] Use E820 reservations to exclude parts of
4709 no_e820 [X86] Ignore E820 reservations for PCI host
4717 skip_isa_align [X86] do not align io start addr, so can
4719 noearly [X86] Don't do any early type 1 scanning.
4827 bit-0 : ACS Source Validation
4835 '0' – force disabled
4839 pci=config_acs=10x@pci:0:0
4893 Format: { 0 | 1 }
4905 See Documentation/arch/x86/i386/IO-APIC.rst.
4908 Format: { parport<nr> | timid | 0 }
4911 pmtmr= [X86] Manual setup of pmtmr I/O Port.
4913 e.g. pmtmr=0x508
4918 PMU counters by setting MMCR0 to 0 (the FC bit is
4921 remains 0.
4959 possible_cpus= [SMP,S390,X86]
5010 Format: <bool> (1/Y/y=enable, 0/N/n=disable)
5017 serial console, keeping this 0 is a good choice
5020 default: 0 (auto_verbose is enabled)
5030 Format: <bool> (1/Y/y=enable, 0/N/n=disable)
5078 (0 = never).
5083 0 = disabled, 1 = enabled (default).
5087 pti= [X86-64] Control Page Table Isolation of user and
5137 Format: <bool> (1/Y/y=enable, 0/N/n=disable)
5142 cec_disable [X86]
5252 RCU_BOOST is not set, valid values are 0-99 and
5298 of permitted values is in the range 0:100000.
5377 Specify rcutree.use_softirq=0 to use rcuc kthreads.
5400 Default is 0.
5697 0x1 bit is normal readers, 0x2 NMI-safe readers,
5698 and 0x4 light-weight readers.
5756 Test RCU priority boosting? 0=no, 1=maybe, 2=yes.
5941 rdrand= [X86,EARLY]
5948 rdt= [HW,X86,RDT]
5956 Format (x86 or x86_64):
6002 Use a write to the PCI config space register 0xcf9 to
6036 x86 laptops.
6057 refscale is built into the kernel and to 0 (leave
6083 them. If <base> is less than 0x10000, the region
6108 reservetop= [X86-32,EARLY]
6137 retbleed= [X86] Control mitigation of RETBleed (Arbitrary
6175 0 "airplane mode". All wifi, bluetooth, wimax, gps, fm,
6180 0 The "airplane mode" button does nothing.
6260 and so on. As a special case a factor of 0 imposes no
6269 schedstats= [KNL,X86] Enable or disable scheduled statistics.
6288 Format: integer between 0 and 10
6289 Default is 0.
6390 Format: { "0" | "1" }
6391 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
6401 Format: { "0" | "1" }
6403 0 -- disable.
6407 serialnumber [BUGS=X86-32]
6409 sev=option[,option...] [X86-64]
6423 show_lapic= [APIC,X86] Advanced Programmable Interrupt Controller
6523 0: Toshiba Satellite 1800 (GP data pin select)
6536 Format: 0 | 1
6547 Format: 0 | 1
6552 spectre_bhi= [X86] Control mitigation of Branch History Injection
6567 spectre_v2= [X86,EARLY] Control mitigation of Spectre variant 2
6606 [X86] Control mitigation of Spectre variant 2
6647 [X86,EARLY] Control RAS overflow mitigation on AMD Zen CPUs
6678 On x86 the options are:
6696 X86: "prctl"
6710 [X86] Enable split lock detection or bus lock detection
6736 0 < N <= 1000.
6747 CPL > 0.
6749 srbds= [X86,INTEL,EARLY]
6783 0: Never.
6787 0x1X: Above plus if high contention.
6833 srcutree.convert_to_big must have the 0x10 bit
6891 [X86]
6914 range 0 < portnr < 1024).
6925 The default value is 0 (no limit).
6960 Format: { on | off | y | n | 1 | 0 }
6964 swiotlb= [ARM,PPC,MIPS,X86,S390,EARLY]
7031 0: no polling (default)
7104 (0). For more information about TPM hardware interfaces
7116 echo 0 > /proc/sys/kernel/tracepoint_printk
7211 If memory has been reserved (see memmap for x86), the instance
7214 memmap=12M$0x284500000 trace_instance=boot_map@0x284500000:12M
7217 memory at 0x284500000 that is 12Megs. The per CPU buffers of that
7357 [x86] reliable: mark tsc clocksource as reliable, this
7362 [x86] noirqtime: Do not use TSC to do irq accounting.
7366 [x86] unstable: mark the TSC clocksource as unstable, this
7369 [x86] nowatchdog: disable clocksource watchdog. Used
7373 [x86] recalibrate: force recalibration against a HW timer
7375 obtained from HW or FW using either an MSR or CPUID(0x15).
7377 [x86] watchdog: Use TSC as the watchdog clocksource with
7384 tsc_early_khz= [X86,EARLY] Skip early TSC calibration and use the given
7390 tsx= [X86] Control Transactional Synchronization
7419 tsx_async_abort= [X86,INTEL,EARLY] Control mitigation for the TSX Async
7483 [X86] Cause panic on unknown NMI.
7485 unwind_debug [X86-64,EARLY]
7494 0 = not authorized, 1 = authorized, 2 = authorized
7505 [USB] Set to log all usbfs traffic (default 0 = off).
7512 [USB] Set to cycle leds on hubs (default 0 = off).
7516 scheme (default 0 = off).
7520 usbfs (default = 16, 0 = max = 2047).
7594 Example: quirks=0781:5580:bk,0a5c:5834:gij
7678 [X86,EARLY] Flags controlling user PTE allocations.
7684 vdso= [X86,SH,SPARC]
7688 vdso=0: disable VDSO mapping
7690 vdso32= [X86] Control the 32-bit vDSO
7692 vdso32=0 or vdso32=2: disable 32-bit VDSO
7696 vdso32=0; otherwise, the default is vdso32=1.
7699 alias for vdso32=0.
7701 Try vdso32=0 if you encounter an error that says:
7708 Format: [0|1]
7712 the allocated input device. If set to 0, video driver
7729 virtio_mmio.device=1K@0x100b0000:48:7
7733 vga= [BOOT,X86-32] Select a particular video mode
7734 See Documentation/arch/x86/boot.rst and
7754 the minimum size (128MB on x86, arm32 platforms).
7774 vsyscall= [X86-64,EARLY]
7776 fixed addresses of 0xffffffffff600x00 from legacy
7795 Format: 0xYX, X = foreground, Y = background.
7796 Default: 0x07 = light gray on black.
7799 Format: 0xCCBBAA, where AA, BB, and CC are the same as
7807 ranging from 0-255.
7813 ranging from 0-255.
7819 ranging from 0-255.
7823 Format=<0|1>
7830 Format=<-1|0|1>
7834 overridden by individual drivers. 0 will hide
7837 vt.italic= [VT] Default color for italic text; 0-15.
7840 vt.underline= [VT] Default color for underlined text; 0-15.
7852 threshold is set to twice the value. A value of 0
7866 help debugging. 0 disables workqueue stall
7877 The default is 0, which disables the panic on stall.
7898 The default is 4 times. 0 disables the warning.
7944 x2apic_phys [X86-64,APIC,EARLY] Use x2apic physical mode instead of
7948 xen_512gb_limit [KNL,X86-64,XEN]
7955 xen_emul_unplug= [HW,X86,XEN,EARLY]
7967 xen_legacy_crash [X86,XEN,EARLY]
7971 xen_mc_debug [X86,XEN,EARLY]
7977 xen_msr_safe= [X86,XEN,EARLY]
7983 xen_nopv [X86]
7990 [KNL,X86,XEN,EARLY] Disable the vector callback for Xen
7999 xen_timer_slop= [X86-64,XEN,EARLY]