Lines Matching +full:enforce +full:- +full:video +full:- +full:mode
5 force -- enable ACPI if default was off
6 on -- enable ACPI but allow fallback to DT [arm64]
7 off -- disable ACPI if default was on
8 noirq -- do not use ACPI for IRQ routing
9 strict -- Be less tolerant of platforms that are not
11 rsdt -- prefer RSDT over (default) XSDT
12 copy_dsdt -- copy DSDT to memory
25 { vendor | video | native | none }
26 If set to vendor, prefer vendor-specific driver
28 of the ACPI video.ko driver.
29 If set to video, use the ACPI video.ko driver.
30 If set to native, use the device's native backlight mode.
58 Documentation/firmware-guide/acpi/debug.rst for more information about
98 default in APIC mode
102 default in PIC mode
121 Disable auto-serialization of AML methods
124 auto-serialization feature.
142 Ignore the ACPI-based watchdog interface (WDAT) and let
163 acpi_osi=! # disable all built-in OS vendor
165 acpi_osi=!! # enable all built-in OS vendor
222 acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode
227 For broken nForce2 BIOS resulting in XT-PIC timer.
232 See Documentation/power/video.rst for information on
235 as soon as the kernel's real-mode entry point is called.
265 See Documentation/sound/alsa-configuration.rst
272 align_va_addr= [X86-64]
277 CPU-intensive style benchmark, and it can vary highly in
280 32: only for 32-bit processes
281 64: only for 64-bit processes
282 on: enable for both 32- and 64-bit processes
283 off: disable for both 32- and 64-bit processes
292 amd_iommu= [HW,X86-64]
295 fullflush - enable flushing of IO/TLB entries when
299 off - do not initialize any AMD IOMMU found in
301 force_isolation - Force device isolation for all
307 amd_iommu_dump= [HW,X86-64]
313 amd_iommu_intr= [HW,X86-64]
316 legacy - Use legacy interrupt remapping mode.
317 vapic - Use virtual APIC mode, which allows IOMMU
319 This mode requires kvm-amd.avic=1.
333 Power management functions (SPARCstation-4/5 + deriv.)
335 Disable APC CPU standby support. SPARCstation-Fox does
336 not play well with APC CPU idle - disable it if you have
343 when initialising the APIC and IO-APIC components.
344 For X86-32, this can also be used to specify an APIC
364 to set it to "all" by meaning -- no limit here.
373 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
391 atkbd.softraw= [HW] Choose between synthetic and real raw mode
397 audit= [KNL] Enable the audit sub-system
399 0 | off - kernel audit is disabled and can not be
401 unset - kernel audit is initialized but disabled and
403 1 | on - kernel audit is initialized and partially
416 0 - Disable the BAU.
417 1 - Enable the BAU.
418 unset - Disable the BAU.
421 Format: <io>,<mode>
424 Format: <io>,<mode>
428 BayCom Serial Port AX.25 Modem (Full Duplex Mode)
429 Format: <io>,<irq>,<mode>[,<baud>]
433 BayCom Serial Port AX.25 Modem (Half Duplex Mode)
434 Format: <io>,<irq>,<mode>
439 See Documentation/block/cmdline-partition.rst
450 See Documentation/admin-guide/bootconfig.rst
461 bttv.pll= See Documentation/admin-guide/media/bttv.rst
470 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
489 inclusive. See arch/mips/include/asm/pgtable-bits.h
499 - foo isn't auto-mounted if you mount all cgroups in
501 - foo isn't visible as an individually mountable
518 nosocket -- Disable socket memory accounting.
519 nokmem -- Disable kernel memory accounting.
520 kmem -- Enable kernel memory accounting.
525 0 -- check protection applied by kernel (includes
527 1 -- check protection requested by application.
541 force such clocks to be always-on nor does it reserve
545 information, see Documentation/driver-api/clk.rst.
547 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
564 [X86-32] pit,hpet,tsc;
571 [X86-64] hpet,tsc
577 architected timer so that code using WFE-based polling
600 cma=nn[MG]@[start[MG][-end[MG]]]
611 Sets the size of kernel per-numa memory area for
613 per-numa CMA altogether. And If this option is not
615 With per-numa CMA enabled, DMA users on node nid will
631 com20020= [HW,NET] ARCnet - COM20020 chipset
635 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
639 ARCnet - COM90xx chipset (memory-mapped buffers)
657 See Documentation/admin-guide/serial-console.rst for more
667 Start an early, polled-mode console on the 8250/16550
670 MMIO inter-register address stride is either 8-bit
671 (mmio), 16-bit (mmio16), or 32-bit (mmio32).
675 the h/w is not re-initialized.
696 syscall, or to executing "dmesg -S --raw" or to reading
716 disable the cpuidle sub-system
722 disable the cpufreq sub-system
730 [X86] Delay for N microsec between assert and de-assert
745 [KNL, X86-64] Select a region under 4G first, and
748 See Documentation/admin-guide/kdump/kdump.rst for further details.
753 start-[end] where start and end are both
755 Documentation/admin-guide/kdump/kdump.rst for an example.
758 [KNL, X86-64] range could be above 4G. Allow kernel
765 [KNL, X86-64] range under 4G. When crashkernel=X,high
770 low memory is needed to make sure DMA buffers for 32-bit
780 [KNL] Disable crypto self-tests
794 See also Documentation/input/devices/joystick-parport.rst
798 Documentation/admin-guide/dynamic-debug-howto.rst for
812 [KNL] verbose self-tests
815 self-tests.
817 1 will print _a lot_ more information - normally
855 Format: { on, no-mount, off }
857 no-mount:
862 get a -EPERM as result when trying to register files
866 Default value is set in build-time with a kernel configuration.
882 Documentation/admin-guide/mm/hugetlbpage.rst.
929 against bounds-checking flaws in the kernel's
935 Disable RADIX MMU mode on POWER9
989 entries for DMA-API debugging code. One entry is
990 required per DMA-API allocation. Use this if the
991 DMA-API debugging code disables itself because the
995 With this option the DMA-API debugging driver
1010 Generic built-in EDID data sets are used, if one of
1015 available in Documentation/admin-guide/edid.rst. An EDID
1027 Control how the dt_cpu_ftrs device-tree binding is
1037 what data is available or for reverse-engineering.
1042 Documentation/admin-guide/dynamic-debug-howto.rst
1059 determined by stdout-path property in device tree's
1064 Start an early, polled-mode console on a Cadence
1075 Start an early, polled-mode console on the 8250/16550
1077 MMIO inter-register address stride is either 8-bit
1078 (mmio) or 32-bit (mmio32 or mmio32be).
1086 Start an early, polled-mode console on a pl011 serial
1090 the driver will use only 32-bit accessors to read/write
1094 Start an early, polled-mode console on a meson serial
1100 Start an early, polled-mode console on an msm serial
1106 Start an early, polled-mode console on an msm serial
1112 Start an early, polled-mode console on a serial port
1118 Start an early, polled-mode console on a serial port
1124 Use RISC-V SBI (Supervisor Binary Interface) for early
1142 Start an early, polled-mode console on a lantiq serial
1156 Start an early, polled-mode, output-only console on the
1161 Start an early, polled-mode console on the
1167 Start an early, polled-mode console on a Qualcomm
1175 coherent non-x86 systems that use system memory for
1234 force: enforce the use of EDAC to report H/W event.
1286 attribute is added to range 0x100000000-0x180000000 and
1287 0x10a0000000-0x1120000000.
1291 range 0x240000000-0x43fffffff.
1303 Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1309 elanfreq= [X86-32]
1317 See Documentation/admin-guide/kdump/kdump.rst for details.
1333 0 -- permissive (log only, no denials).
1334 1 -- enforcing (deny and log).
1337 /sys/fs/selinux/enforce.
1358 See also Documentation/fault-injection/.
1362 See Documentation/admin-guide/sysctl/net.rst for
1366 See Documentation/admin-guide/blockdev/floppy.rst.
1369 [IA-64] Avoid check_sal_cache_flush which may hang on
1374 forcepae [X86-32]
1393 ftrace_filter=[function-list]
1395 tracer at boot up. function-list is a comma separated
1400 ftrace_notrace=[function-list]
1402 function-list. This list can be changed at run time
1406 ftrace_graph_filter=[function-list]
1409 function-list is a comma separated list of functions
1413 ftrace_graph_notrace=[function-list]
1415 function-list. This list is a comma separated list of
1435 off -- Don't create device links from firmware info.
1436 permissive -- Create device links from firmware info
1439 on -- Create device links from firmware info and use it
1440 to enforce probe and suspend/resume ordering.
1441 rpm -- Like "on", but also use to order runtime PM.
1447 See also Documentation/input/devices/joystick-parport.rst
1451 gart_fix_e820= [X86-64] disable the fix e820 for K8 GART
1455 gcov_persist= [GCOV] When non-zero (default), profiling data for
1488 gpio-mockup.gpio_mockup_ranges
1493 [KNL] Should the hard-lockup detector generate
1499 for 64-bit NUMA, off otherwise.
1502 hcl= [IA-64] SGI's Hardware Graph compatibility layer
1509 corresponding firmware-first mode error processing
1517 highres= [KNL] Enable/disable high resolution timer mode.
1523 hpet= [X86-32,HPET] option to control HPET usage
1540 boot-time allocation of gigantic hugepages is skipped.
1548 Documentation/admin-guide/mm/hugetlbpage.rst.
1558 Documentation/admin-guide/mm/hugetlbpage.rst.
1567 by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
1573 hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs.
1593 i8042.debug [HW] Toggle i8042 debug mode
1596 (disabled by default, and as a pre-condition
1598 i8042.direct [HW] Put keyboard port into non-translated mode
1612 suspend-to-ram transitions, only during s2r
1645 -1 -- never invert brightness
1646 0 -- machine default
1647 1 -- force brightness inversion
1652 ide-core.nodma= [HW] (E)IDE subsystem
1658 ide-generic.probe-mask= [HW] (E)IDE subsystem
1670 ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem
1681 idle=nomwait: Disable mwait for CPU C-states
1683 ieee754= [MIPS] Select IEEE Std 754 conformance mode
1693 encoding mode.
1698 legacy only accept legacy-NaN binaries, if supported
1700 2008 only accept 2008-NaN binaries, if supported
1709 'relaxed' straps the emulator for both legacy-NaN and
1710 2008-NaN, whereas 'strict' enables legacy-NaN only on
1715 mode generally follows that for the NaN encoding,
1719 Ignore loglevel setting - this will print /all/
1734 Format: { "off" | "enforce" | "fix" | "log" }
1735 default: "enforce"
1760 mode bit set by either the effective uid (euid=0) or
1783 Formats: { "ima" | "ima-ng" | "ima-sig" }
1784 Default: "ima-ng"
1816 initcall_blacklist= [KNL] Do not execute a comma-separated list of
1817 initcall functions. Useful for debugging built-in
1850 0 -- basic integrity auditing messages. (Default)
1851 1 -- additional integrity auditing messages.
1864 forcedac [X86-64]
1866 for io virtual address below 32-bit forcing dual
1868 than 32-bit addressing. The default is to look
1869 for translation below 32-bit and if not available
1880 By default, scalable mode will be disabled even if the
1882 mode translation. With this option set, scalable mode
1887 could harm performance of some high-throughput
1901 1 to 9 specify maximum depth of C-state.
1910 enabling its internal governor). This mode cannot be
1911 used along with the hardware-managed P-states (HWP)
1915 in favor of acpi-cpufreq. Forcing the intel_pstate driver
1916 instead of acpi-cpufreq may disable platform features, such
1918 P-States information being indicated to OSPM and therefore
1921 or on platforms that use pcc-cpufreq instead of acpi-cpufreq.
1929 Enforce ACPI _PPC performance limits. If the Fixed ACPI
1934 Allow per-logical-CPU P-State performance control limits using
1937 intremap= [X86-64, Intel-IOMMU]
1942 BIOS x2APIC opt-out request will be ignored
1966 0 - Lazy mode.
1970 Will fall back to strict mode if not supported by
1972 1 - Strict mode (default).
1979 0 - Use IOMMU translation for DMA.
1980 1 - Bypass the IOMMU for DMA.
1981 unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
1983 io7= [HW] IO7 for Marvel-based Alpha systems
1998 See Documentation/admin-guide/nfs/nfsroot.rst.
2022 Enables support for pseudo-NMIs in the kernel. This
2041 [Deprecated - use cpusets instead]
2042 Format: [flag-list,]<cpu-list>
2073 "number of CPUs in system - 1".
2099 The format of <cpu-list> is described above.
2103 ivrs_ioapic [HW,X86-64]
2104 Provide an override to the IOAPIC-ID<->DEVICE-ID
2106 example, to map IOAPIC-ID decimal 10 to
2110 ivrs_hpet [HW,X86-64]
2111 Provide an override to the HPET-ID<->DEVICE-ID
2113 example, to map HPET-ID decimal 0 to
2117 ivrs_acpihid [HW,X86-64]
2118 Provide an override to the ACPI-HID:UID<->DEVICE-ID
2120 example, to map UART-HID:UID AMD0020:0 to
2133 [KNL] Enforce KASAN (Kernel Address Sanitizer) to print
2140 kernelcore= [KNL,X86,IA-64,PPC]
2143 the kernel for non-movable allocations. The requested
2153 subsystem. Note that allocations like PTEs-from-HighMem
2161 for non-movable allocations and remaining memory is used
2172 gdb or control-c on the dbgp connection. When
2173 not using this parameter you use sysrq-g to break into
2178 or a supported polling keyboard driver (non-usb).
2182 Optional Kernel mode setting:
2188 characters and can work in polling mode, you can use
2205 Configure the RouterBoard 532 series on-chip
2208 kmemleak= [KNL] Boot-time kmemleak enable/disable
2214 kprobe_event=[probe-list]
2216 The probe-list is a semicolon delimited list of probe
2262 kvm-amd.nested= [KVM,AMD] Allow nested virtualization in KVM/SVM.
2265 kvm-amd.npt= [KVM,AMD] Disable nested paging (virtualized MMU)
2267 Default is 1 (enabled) if in 64-bit or 32-bit PAE mode.
2269 kvm-arm.vgic_v3_group0_trap=
2270 [KVM,ARM] Trap guest accesses to GICv3 group-0
2273 kvm-arm.vgic_v3_group1_trap=
2274 [KVM,ARM] Trap guest accesses to GICv3 group-1
2277 kvm-arm.vgic_v3_common_trap=
2281 kvm-arm.vgic_v4_enable=
2293 kvm-intel.ept= [KVM,Intel] Disable extended page tables
2297 kvm-intel.emulate_invalid_guest_state=
2301 kvm-intel.flexpriority=
2305 kvm-intel.nested=
2309 kvm-intel.unrestricted_guest=
2311 (virtualized real and unpaged mode) on capable
2314 kvm-intel.vmentry_l1d_flush=[KVM,Intel] Mitigation for L1 Terminal Fault
2315 CVE-2018-3620.
2326 kvm-intel.vpid= [KVM,Intel] Disable Virtual Processor Identification
2393 For details see: Documentation/admin-guide/hw-vuln/l1tf.rst
2399 lapic [X86-32,APIC] Enable the local APIC even if BIOS
2403 value for LAPIC timer one-shot implementation. Default
2438 first fan-out link behind PMP device. It does not
2452 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
2464 hot-unplug link recovery
2501 Set the number of locking read-acquisition kthreads.
2506 Set the number of locking write-acquisition kthreads.
2509 Set time (s) after boot for CPU-hotplug testing.
2512 Set time (s) between CPU-hotplug operations, or
2513 zero to disable CPU-hotplug testing.
2516 Set task-shuffle interval (jiffies). Shuffling
2517 tasks allows some CPUs to go into dyntick-idle
2518 mode during the locktorture test.
2522 is useful for hands-off automated testing.
2555 7 (KERN_DEBUG) debug-level messages
2565 logo.nologo [FB] Disables display of the built-in Linux logo.
2583 an IEEE 1284-compliant printer is attached; if
2589 time-consuming boot-time autodetection (up to 250 ms per
2610 machvec= [IA-64] Force the use of a particular machine-vector
2616 Example: machtype=lemote-yeeloong-2f-7inch
2631 (loop.max_loop) unconditionally pre-created at init time. The default
2634 devices can be requested on-demand with the
2635 /dev/loop-control interface.
2637 mce [X86-32] Machine Check Exception
2639 mce=option [X86-64] See Documentation/x86/x86_64/boot-options.rst
2642 See Documentation/admin-guide/md.rst.
2649 Control mitigation for the Micro-architectural Data
2664 full - Enable MDS mitigation on vulnerable CPUs
2665 full,nosmt - Enable MDS mitigation and disable
2667 off - Unconditionally disable MDS mitigation
2669 On TAA-affected machines, mds=off can be prevented by
2678 For details see: Documentation/admin-guide/hw-vuln/mds.rst
2697 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
2702 per-device physically contiguous DMA buffers.
2710 See Documentation/admin-guide/mm/memory-hotplug.rst.
2735 Example: Exclude memory from 0x18690000-0x1869ffff
2749 memmap=<size>%<offset>-<oldtype>+<newtype>
2751 from <oldtype> to <newtype>. If "-<oldtype>" is left
2766 repeatable BIOS-originated corruption always
2791 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
2799 Refer to Documentation/virt/kvm/amd-memory-encryption.rst
2802 mem_sleep_default= [SUSPEND] Default system suspend mode:
2803 s2idle - Suspend-To-Idle
2804 shallow - Power-On Suspend or equivalent (if supported)
2805 deep - Suspend-To-RAM or equivalent (if supported)
2806 See Documentation/admin-guide/pm/sleep-states.rst.
2809 See Documentation/admin-guide/media/meye.rst.
2811 mfgpt_irq= [IA-32] Specify the IRQ to use for the
2812 Multi-Function General Purpose Timers on AMD Geode
2815 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
2829 0 - The attached screen is the 3.5" TFT
2830 1 - The attached screen is the 7" TFT
2831 2 - The VGA Shield is attached (1024x768)
2835 b - Enable backlight. The TFT backlight pin will be
2839 c - Enable the s3c camera interface.
2840 t - Reserved for enabling touchscreen support. The
2844 https://repo.or.cz/w/linux-2.6/mini2440.git
2849 arch-independent options, each of which is an
2850 aggregation of existing arch-specific options.
2863 ssbd=force-off [ARM64]
2882 have other ways of avoiding SMT-based attacks.
2916 full - Enable mitigation on vulnerable CPUs
2918 full,nosmt - Enable mitigation and disable SMT on
2921 off - Unconditionally disable mitigation
2934 Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst
2942 module_blacklist= [KNL] Do not load a comma-separated list of
2949 touchpads working in absolute mode only).
2956 movablecore= [KNL,X86,IA-64,PPC]
2967 movable_node [KNL] Boot-time switch to make hotplugable memory
2974 Format: <name>,<region-number>,<size>,<offset>
2977 <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
2986 onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration
2990 boundary - index of last SLC block on Flex-OneNAND.
2992 lock - Configure if Flex-OneNAND boundary should be locked.
2999 See arch/arm/mach-s3c2412/mach-jive.c
3027 something different and driver-specific.
3038 See Documentation/admin-guide/nfs/nfsroot.rst.
3040 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
3041 See Documentation/admin-guide/nfs/nfsroot.rst.
3044 See Documentation/admin-guide/nfs/nfsroot.rst.
3068 [NFS] enable 64-bit inode numbers.
3069 If zero, the NFS client will fake up a 32-bit inode
3071 of returning the full 64-bit number.
3072 The default is to return 64-bit inode numbers.
3097 Servers that do not support this mode of operation
3102 [NFS4] Specify an additional fixed unique ident-
3133 driver. A non-zero value sets the minimum interval
3145 NMI stack-backtrace request.
3154 0 - turn hardlockup detector in nmi_watchdog off
3155 1 - turn hardlockup detector in nmi_watchdog on
3172 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
3176 no5lvl [X86-64] Disable 5-level paging mode. Forces
3177 kernel to use 4-level paging instead.
3208 caches in the slab allocator. Saves per-node memory,
3228 nodelayacct [KNL] Disable per-task delay accounting
3234 no_entry_flush [PPC] Don't flush the L1-D cache when entering the kernel.
3236 noexec [IA-64]
3239 On X86-32 available only on PAE configured kernels.
3240 noexec=on: enable non-executable mappings (default)
3241 noexec=off: disable non-executable mappings
3244 Disable SMAP (Supervisor Mode Access Prevention)
3248 Disable SMEP (Supervisor Mode Execution Prevention)
3251 noexec32 [X86-64]
3252 This affects only 32-bit executables.
3253 noexec32=on: enable non-executable mappings (default)
3255 noexec32=off: disable non-executable mappings
3260 nofxsr [BUGS=X86-32] Disables x86 floating point extended
3262 legacy floating-point registers on task switch.
3286 [PPC] Don't flush the L1-D cache after accessing user data.
3290 enabling legacy floating-point and sse state.
3315 nohalt [IA-64] Tells the kernel not to use the power saving
3317 power-consumption. On the positive side, it reduces
3318 interrupt wake-up latency, which may improve performance
3320 real-time systems.
3340 noirqdebug [X86-32] Disables the code which attempts to detect and
3351 nointremap [X86-64, Intel-IOMMU] Do not enable interrupt
3353 [Deprecated - use intremap=off]
3355 nointroute [IA-64]
3359 nojitter [IA-64] Disables jitter checking for ITC timers.
3361 no-kvmclock [X86,KVM] Disable paravirtualized KVM clock driver
3363 no-kvmapf [X86,KVM] Disable paravirtualized asynchronous page
3366 no-vmw-sched-clock
3370 no-steal-acc [X86,PV_OPS,ARM64] Disable paravirtualized steal time
3374 nolapic [X86-32,APIC] Do not enable or use the local APIC.
3376 nolapic_timer [X86-32,APIC] Do not use the local APIC timer.
3381 nomca [IA-64] Disable machine check abort handling
3383 nomce [X86-32] Disable Machine Check Exception
3385 nomfgpt [X86-32] Disable Multi-Function General Purpose
3397 nopcid [X86-64] Disable the PCID cpu feature.
3402 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
3413 no-scroll [VGA] Disables scrollback.
3414 This is required for the Braillex ib80-piezo Braille
3417 nosbagart [IA-64]
3419 nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support.
3424 nosoftlockup [KNL] Disable the soft-lockup detector.
3429 soft-lockup and NMI watchdog (hard-lockup).
3433 nox2apic [X86-64,APIC] Do not enable x2APIC mode.
3458 nptcg= [IA-64] Override max number of concurrent global TLB
3467 n. So during boot up some boot time memory for per-cpu
3468 variables need be pre-allocated for later physical cpu
3479 See Documentation/admin-guide/sysctl/vm.rst for details.
3482 See Documentation/core-api/debugging-via-ohci1394.rst for more
3508 timer mode (see also oprofile.timer
3509 for generic hr timer mode)
3521 running on a platform with a direct-mapped memory-side
3527 page_owner= [KNL] Boot-time page_owner enabling option.
3533 page_poison= [KNL] Boot-time parameter changing the state of
3563 See Documentation/admin-guide/tainted-kernels.rst for
3571 Run kdump after running panic-notifiers and dumping
3581 parkbd.mode= [HW] Parallel port keyboard adapter mode of operation,
3583 Format: <mode>
3601 a specific mode. This is necessary on Pegasos
3603 up parallel port mode and sets it to spp.
3616 See also Documentation/admin-guide/blockdev/paride.rst.
3645 bios [X86-32] force use of PCI BIOS, don't access
3647 has a non-standard PCI host bridge.
3648 nobios [X86-32] disallow use of PCI BIOS, only direct
3654 data in IO port 0xCFC, both 32-bit).
3656 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
3657 the function, IO port 0xCFA, also 8-bit, sets
3659 through ports 0xC000-0xCFFF).
3666 root domains (aka PCI segments, in ACPI-speak).
3674 disable the use of MSI interrupts system-wide.
3679 primary IO-APIC for bridges that cannot disable
3686 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
3710 F0000h-100000h range.
3715 assign-busses [X86] Always assign all PCI bus
3743 bfsort Sort PCI devices into breadth-first order.
3746 nobfsort Don't sort PCI devices into breadth-first order.
3748 tuning and use the BIOS-configured MPS defaults.
3758 configuration allows peer-to-peer DMA between
3761 that hot-added devices will work.
3776 A PCI-PCI bridge can be specified if resource
3782 for 4096-byte alignment.
3784 end-to-end CRC checking).
3813 noats [PCIE, Intel-IOMMU, AMD-IOMMU]
3849 dpc-native Use native PCIe service for DPC only. May
3866 Keep all power-domains already enabled by bootloader on,
3872 See Documentation/admin-guide/blockdev/paride.rst.
3887 See Documentation/admin-guide/blockdev/paride.rst.
3890 See Documentation/admin-guide/blockdev/paride.rst.
3892 pirq= [SMP,APIC] Manual mp-table setup
3893 See Documentation/x86/i386/IO-APIC.rst.
3897 See also Documentation/admin-guide/parport.rst.
3908 CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time
3917 { on | off | curr | res | no-curr | no-res }
3955 print-fatal-signals=
3961 coredump - etc.
3964 you might want to try "ulimit -i unlimited".
3976 on - unlimited logging to /dev/kmsg from userspace
3977 off - logging to /dev/kmsg disabled
3978 ratelimit - ratelimit the logging
3985 Limit processor to maximum C-state
3989 Ignore the _CST method to determine C-states,
3996 Param: "schedule" - profile schedule points.
3997 Param: "sleep" - profile D-state sleeping (millisecs).
3999 Param: "kvm" - profile VM exits.
4000 Param: <number> - step/bucket size as a power of 2 for
4030 See Documentation/admin-guide/blockdev/paride.rst.
4032 pti= [X86-64] Control Page Table Isolation of user and
4037 on - unconditionally enable
4038 off - unconditionally disable
4039 auto - kernel detects whether your CPU model is
4044 nopti [X86-64]
4048 [KNL] Number of legacy pty's. Overwrites compiled-in
4056 See Documentation/admin-guide/md.rst.
4059 See Documentation/admin-guide/blockdev/ramdisk.rst.
4069 ras=option[,option,...] [KNL] RAS-specific options
4081 the specified list of CPUs to be no-callback CPUs.
4084 purpose, where "x" is "p" for RCU-preempt, and
4085 "s" for RCU-sched, and "N" is the CPU number.
4087 which can be useful for HPC and real-time
4096 This improves the real-time response for the
4113 RCU grace-period cleanup.
4117 RCU grace-period initialization.
4121 RCU grace-period pre-initialization, that is,
4122 the propagation of recent CPU-hotplug changes up
4127 per-CPU rcuc kthreads. Defaults to a non-zero
4135 cache-to-cache transfer latencies.
4141 and for NUMA systems with large remote-access
4154 Set delay from grace-period initialization to
4167 soliciting quiescent-state help from
4179 Set the SCHED_FIFO priority of the RCU per-CPU
4182 and for the RCU grace-period kthreads (rcu_bh,
4184 set, valid values are 1-99 and the default is 1
4185 (the least-favored priority). Otherwise, when
4186 RCU_BOOST is not set, valid values are 0-99 and
4187 the default is zero (non-realtime operation).
4193 the wakeup overhead on the global grace-period
4195 each group's NOCB grace-period kthread.
4203 batch limiting is re-enabled.
4207 RCU's force-quiescent-state scan will aggressively
4225 Cause the grace-period kthread to get an extra
4227 it should at force-quiescent-state time.
4233 this specifies an rcu_read_unlock()-time delay
4237 of RCU-protected pointers after the relevant
4247 grace-period primitives such as call_rcu().
4258 grace-period primitives.
4261 Set test-start holdoff period. The purpose of
4280 Set number of RCU readers. The value -1 selects
4282 "n" less than -1 selects N-n+1, where N is again
4283 the number of CPUs. For example, -2 selects N
4284 (the number of CPUs), -3 selects N+1, and so on.
4285 A value of "n" less than or equal to -N selects
4298 complete. This is useful for hands-off automated
4305 Write-side holdoff between grace periods,
4322 Enable RCU grace-period forward-progress testing
4326 Specify the fraction of a CPU-stall-warning
4327 period to do tight-loop forward-progress testing.
4331 forward-progress tests.
4335 need_resched() during tight-loop forward-progress
4339 Use conditional/asynchronous update-side
4343 Use expedited update-side primitives, if available.
4346 Use normal (non-expedited) asynchronous
4347 update-side primitives, if available.
4350 Use normal (non-expedited) synchronous
4351 update-side primitives, if available. If all
4355 they are all non-zero.
4363 Leak an RCU-protected pointer out of the reader.
4378 Set number of RCU readers. The value -1 selects
4379 N-1, where N is the number of CPUs. A value
4380 "n" less than -1 selects N-n-2, where N is again
4381 the number of CPUs. For example, -2 selects N
4382 (the number of CPUs), -3 selects N+1, and so on.
4385 Enable debug-object double-call_rcu() testing.
4388 Set time (s) after boot for CPU-hotplug testing.
4391 Set time (jiffies) between CPU-hotplug operations,
4392 or zero to disable CPU-hotplug testing.
4395 Set the number of read-then-exit kthreads used
4397 task-exit processing.
4400 The number of times in a given read-then-exit
4401 episode that a set of read-then-exit kthreads
4406 read-then-exit testing episodes.
4409 Set task-shuffle interval (s). Shuffling tasks
4410 allows some CPUs to go into dyntick-idle mode
4415 is useful for hands-off automated testing.
4424 to any other stall-related activity.
4434 grace-period kthread to test RCU CPU stall
4460 Test RCU's dyntick-idle handling. See also the
4486 Use expedited grace-period primitives, for
4490 real-time latency, and degrade energy efficiency.
4494 Use only normal grace-period primitives,
4497 real-time latency, CPU utilization, and
4499 increased grace-period latency. This parameter
4506 only normal grace-period primitives. No effect
4513 number avoids disturbing real-time workloads,
4530 force - Override the decision by the kernel to hide the
4550 (prefix with 'panic_' to set mode for panic
4558 Set test-start holdoff period. The purpose of
4567 but the default has already reduced the per-pass
4572 Set number of readers. The default value of -1
4581 Set the read-side critical-section duration,
4585 Specify the read-protection implementation to test.
4598 See Documentation/admin-guide/cgroup-v1/cpusets.rst.
4606 reservetop= [X86-32]
4628 See Documentation/power/swsusp-and-swap-files.rst
4644 during restoration read-only).
4652 off - no mitigation
4653 auto - automatically select a migitation
4654 auto,nosmt - automatically select a mitigation,
4658 ibpb - mitigate short speculation windows on
4661 unret - force enable untrained return thunks,
4662 only effective on AMD f15h-f17h
4664 unret,nosmt - like unret, will disable SMT when STIBP
4673 0 "airplane mode". All wifi, bluetooth, wimax, gps, fm,
4678 0 The "airplane mode" button does nothing.
4679 1 The "airplane mode" button toggles between everything
4681 2 The "airplane mode" button toggles between everything
4691 ro [KNL] Mount root device read-only on boot
4694 on Mark read-only kernel memory as read-only (default).
4695 off Leave read-only kernel memory writable for debugging.
4700 debug-uart get routed to the D+ and D- pins of the usb
4722 rw [KNL] Mount root device read-write on boot
4724 S [KNL] Run init in single mode
4727 Set s390 IOTLB flushing mode
4764 to 10 seconds for built-in smp_call_function()
4771 that requesting even small non-zero numbers of
4778 The default of -1 specifies a number of kthreads
4783 test before initiating CPU-hotplug operations.
4787 CPU-hotplug operations. Specifying zero (which
4788 is the default) disables CPU-hotplug operations.
4794 Non-zero values are useful for automated tests.
4817 "wait" parameter. A value of -1 selects the
4818 default if all other weights are -1. However,
4820 value of -1 will instead select a weight of zero.
4825 non-zero "wait" parameter. See weight_single.
4838 non-zero "wait" parameter. See weight_single
4850 non-zero "wait" parameter. See weight_single
4857 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
4858 1 -- enable.
4869 0 -- disable.
4870 1 -- enable.
4876 0 -- disable.
4877 1 -- enable.
4880 serialnumber [BUGS=X86-32]
4885 simeth= [IA-64]
4919 memory cgroup sub-caches. 1 to enable, 0 to disable.
4952 smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
4953 smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port
4954 smsc-ircc2.ircc_sir= [HW] SIR base I/O port
4955 smsc-ircc2.ircc_fir= [HW] FIR base I/O port
4956 smsc-ircc2.ircc_irq= [HW] IRQ line
4957 smsc-ircc2.ircc_dma= [HW] DMA channel
4958 smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
4968 Default: -1 (no limit)
4971 [KNL] Should the soft-lockup detector generate panics.
4974 A value of 1 instructs the soft-lockup detector
4975 to panic the machine when a soft-lockup occurs. It is
4978 respective build-time switch to that functionality.
4981 [KNL] Should the soft-lockup detector generate
4986 See Documentation/admin-guide/laptops/sonypi.rst
4993 on - unconditionally enable, implies
4995 off - unconditionally disable, implies
4997 auto - kernel detects whether your CPU model is
5014 retpoline - replace indirect branches
5015 retpoline,generic - Retpolines
5016 retpoline,lfence - LFENCE; indirect branch
5017 retpoline,amd - alias for retpoline,lfence
5018 eibrs - enhanced IBRS
5019 eibrs,retpoline - enhanced IBRS + Retpolines
5020 eibrs,lfence - enhanced IBRS + LFENCE
5021 ibrs - use IBRS to protect kernel
5031 on - Unconditionally enable mitigations. Is
5034 off - Unconditionally disable mitigations. Is
5037 prctl - Indirect branch speculation is enabled,
5043 - Like "prctl" above, but only STIBP is
5049 - Same as "prctl" above, but all seccomp
5054 - Like "seccomp" above, but only STIBP is
5059 auto - Kernel selects the mitigation depending on
5091 on - Unconditionally disable Speculative Store Bypass
5092 off - Unconditionally enable Speculative Store Bypass
5093 auto - Kernel detects whether the CPU model contains an
5099 prctl - Control Speculative Store Bypass per thread
5103 seccomp - Same as "prctl" above, but all seccomp threads
5111 on,auto - On Power8 and Power9 insert a store-forwarding
5115 off - No action.
5132 off - not enabled
5134 warn - the kernel will emit rate limited warnings
5136 exception. This mode is the default on CPUs
5139 fatal - the kernel will send SIGBUS to applications
5143 firmware (i.e. not while executing in user mode)
5145 mode.
5151 Certain CPUs are vulnerable to an MDS-like
5169 grace-period sequence counter wrap for the
5170 srcu_data structure's ->srcu_gp_seq_needed field.
5192 force-on: Unconditionally enable mitigation for
5194 force-off: Unconditionally disable mitigation for
5211 stacktrace_filter=[function-list]
5213 will trace at boot up. function-list is a comma separated
5221 Set the STI (builtin display/keyboard on the HP-PARISC
5223 as the initial boot-console.
5224 See also comment in drivers/video/console/sticore.c.
5227 See comment in drivers/video/console/sticore.c.
5259 auto the server chooses an appropriate mode
5264 to global on non-NUMA machines)
5278 mode before resuming the system (see
5290 it if 0 is given (See Documentation/admin-guide/cgroup-v1/memory.rst)
5292 swiotlb= [ARM,IA-64,PPC,MIPS,X86]
5294 <int> -- Number of I/O TLB slabs
5295 force -- force using of bounce buffers even if they
5297 noforce -- Never use bounce buffers (for debugging)
5321 Ignore sysrq setting - this boot parameter will
5329 cache size. See Documentation/networking/ip-sysctl.rst
5335 Specify "mem" (for Suspend-to-RAM) or "standby" (for
5340 wakeup-capable RTC alarm.
5346 -1: disable all active trip points in all thermal zones
5350 -1: disable all critical trip points in all thermal zones
5361 -1: disable all passive trip points
5367 <deci-seconds>: poll all this frequency
5389 Prevent the CPU-hotplug component of torturing
5393 Dump the ftrace buffer at torture-test shutdown,
5397 with rotating-rust storage.
5413 trace_event=[event-list]
5415 to facilitate early boot debugging. The event-list is a
5419 trace_options=[option-list]
5421 The option-list is a comma delimited list of options
5471 See Documentation/admin-guide/mm/transhuge.rst
5479 high-resolution timer mode on older hardware, and in
5505 on - Enable TSX on the system. Although there are
5508 several previous speculation-related CVEs, and
5512 off - Disable TSX on the system. (Note that this
5520 auto - Disable TSX if X86_BUG_TAA is present,
5525 See Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
5531 Similar to Micro-architectural Data Sampling (MDS)
5546 full - Enable TAA mitigation on vulnerable CPUs
5549 full,nosmt - Enable TAA mitigation and disable SMT on
5552 vulnerable to cross-thread TAA attacks.
5553 off - Unconditionally disable TAA mitigation
5555 On MDS-affected machines, tsx_async_abort=off can be
5567 Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
5573 See also Documentation/input/devices/joystick-parport.rst
5575 udbg-immortal [PPC] When debugging early kernel crashes that
5581 Set number of hash buckets for UDP/UDP-Lite connections
5583 uhci-hcd.ignore_oc=
5585 Some badly-designed motherboards generate lots of
5596 (default -1 = authorized except for wireless USB,
5602 for newly-detected USB devices (default 2). This
5630 [USB] Specifies timeout for the initial 64-byte
5637 [USB] A list of quirk entries to augment the built-in
5640 VendorID:ProductID:Flags. The IDs are 4-digit hex
5642 will change the built-in quirk; setting it if it is
5647 a 255-byte read);
5651 Set-Interface requests);
5670 (bInterval-1).
5705 usb-storage.delay_use=
5709 usb-storage.quirks=
5711 override the built-in unusual_devs list. List
5714 and Product ID values (4-digit hex numbers) and
5716 to a common usb-storage quirk flag as follows:
5758 medium is write-protected).
5767 1 - undefined instruction events
5768 2 - system calls
5769 4 - invalid data aborts
5770 8 - SIGSEGV faults
5771 16 - SIGBUS faults
5787 vdso32= [X86] Control the 32-bit vDSO
5788 vdso32=1: enable 32-bit VDSO
5789 vdso32=0 or vdso32=2: disable 32-bit VDSO
5799 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
5801 vector= [IA-64,SMP]
5804 video= [FB] Frame buffer configuration
5807 video.brightness_switch_enabled= [0,1]
5809 generated by hotkey, video driver will adjust brightness
5811 the allocated input device; If set to 0, video driver
5832 vga= [BOOT,X86-32] Select a particular video mode
5834 Documentation/admin-guide/svga.rst.
5849 - Disable all of the above options
5870 vsyscall= [X86-64]
5873 code). Most statically-linked binaries and older
5897 see VGA-softcursor.txt. Default: 2 = underline.
5902 This is a 16-member array composed of values
5903 ranging from 0-255.
5908 This is a 16-member array composed of values
5909 ranging from 0-255.
5914 This is a 16-member array composed of values
5915 ranging from 0-255.
5920 Set system-wide default UTF-8 mode for all tty's.
5921 Default is 1, i.e. UTF-8 mode is enabled for all
5926 Format=<-1|0|1>
5927 Set system-wide default for whether a cursor
5928 is shown on new VTs. Default is -1,
5933 vt.italic= [VT] Default color for italic text; 0-15.
5936 vt.underline= [VT] Default color for underlined text; 0-15.
5940 see Documentation/watchdog/watchdog-parameters.rst
5941 or other driver-specific files in the
5967 that this also can be controlled per-workqueue for
5971 Per-cpu workqueues are generally preferred because
5973 locality; unfortunately, per-cpu workqueues tend to
5976 Enabling this makes the per-cpu workqueues which
5991 forces round-robin CPU selection to flush out
5996 x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of
5997 default x2apic cluster mode on platforms
6000 x86_intel_mid_timer= [X86-32,APBT]
6006 xen_512gb_limit [KNL,X86-64,XEN]
6016 ide-disks -- unplug primary master IDE devices
6017 aux-ide-disks -- unplug non-primary-master IDE devices
6018 nics -- unplug network devices
6019 all -- unplug all emulated devices (NICs and IDE disks)
6020 unnecessary -- unplugging emulated devices is
6023 never -- do not unplug even if version check succeeds
6050 xen_timer_slop= [X86-64,XEN]
6068 preferred over the 2-level event handling, as it is
6089 allows the fallback firmware mode to be used:
6095 xhci-hcd.quirks [USB,KNL]
6107 is only called on a kernel crash. Default mode,
6108 i.e. either "ro" or "rw" mode, is controlled
6111 is called only on a kernel crash, mode is write,