Lines Matching +full:riscv +full:- +full:crypto
16 force -- enable ACPI if default was off
17 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
18 off -- disable ACPI if default was on
19 noirq -- do not use ACPI for IRQ routing
20 strict -- Be less tolerant of platforms that are not
22 rsdt -- prefer RSDT over (default) XSDT
23 copy_dsdt -- copy DSDT to memory
24 nocmcff -- Disable firmware first mode for corrected
28 nospcr -- disable console in ACPI SPCR table as
45 If set to vendor, prefer vendor-specific driver
77 Documentation/firmware-guide/acpi/debug.rst for more information about
135 Format: <byte> or <bitmap-list>
138 Disable auto-serialization of AML methods
141 auto-serialization feature.
159 Ignore the ACPI-based watchdog interface (WDAT) and let
180 acpi_osi=! # disable all built-in OS vendor
182 acpi_osi=!! # enable all built-in OS vendor
244 For broken nForce2 BIOS resulting in XT-PIC timer.
253 as soon as the kernel's real-mode entry point is called.
291 See Documentation/sound/alsa-configuration.rst
298 align_va_addr= [X86-64]
303 CPU-intensive style benchmark, and it can vary highly in
306 32: only for 32-bit processes
307 64: only for 64-bit processes
308 on: enable for both 32- and 64-bit processes
309 off: disable for both 32- and 64-bit processes
319 Allow execve() of 32-bit applications and setting of the
321 subset of the CPUs support 32-bit EL0. When this
322 parameter is present, the set of CPUs supporting 32-bit
324 and hot-unplug operations may be restricted.
326 See Documentation/arch/arm64/asymmetric-32bit.rst for more
329 amd_iommu= [HW,X86-64]
332 fullflush - Deprecated, equivalent to iommu.strict=1
333 off - do not initialize any AMD IOMMU found in
335 force_isolation - Force device isolation for all
340 force_enable - Force enable the IOMMU on platforms known
343 pgtbl_v1 - Use v1 page table for DMA-API (Default).
344 pgtbl_v2 - Use v2 page table for DMA-API.
345 irtcachedis - Disable Interrupt Remapping Table (IRT) caching.
346 nohugepages - Limit page-sizes used for v1 page-tables
348 v2_pgsizes_only - Limit page-sizes used for v1 page-tables
352 amd_iommu_dump= [HW,X86-64]
358 amd_iommu_intr= [HW,X86-64]
361 legacy - Use legacy interrupt remapping mode.
362 vapic - Use virtual APIC mode, which allows IOMMU
364 This mode requires kvm-amd.avic=1.
393 Disable amd-pstate preferred core.
406 Power management functions (SPARCstation-4/5 + deriv.)
408 Disable APC CPU standby support. SPARCstation-Fox does
409 not play well with APC CPU idle - disable it if you have
412 apic [APIC,X86-64] Use IO-APIC. Default.
418 when initialising the APIC and IO-APIC components.
419 For X86-32, this can also be used to specify an APIC
446 0 -- disable.
447 1 -- enable.
450 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
498 audit= [KNL] Enable the audit sub-system
500 0 | off - kernel audit is disabled and can not be
502 unset - kernel audit is initialized but disabled and
504 1 | on - kernel audit is initialized and partially
517 0 - Disable the BAU.
518 1 - Enable the BAU.
519 unset - Disable the BAU.
558 See Documentation/block/cmdline-partition.rst
572 See Documentation/admin-guide/bootconfig.rst
577 bttv.pll= See Documentation/admin-guide/media/bttv.rst
586 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
605 inclusive. See arch/mips/include/asm/pgtable-bits.h
615 - foo isn't auto-mounted if you mount all cgroups in
617 - foo isn't visible as an individually mountable
619 - if foo is an optional feature then the feature is
625 Specifying "pressure" disables per-cgroup pressure
643 nosocket -- Disable socket memory accounting.
644 nokmem -- Disable kernel memory accounting.
645 nobpf -- Disable BPF memory accounting.
650 0 -- check protection applied by kernel (includes
652 1 -- check protection requested by application.
664 numbers X. Note the Linux-specific bits are not necessarily
665 stable over kernel options, but the vendor-specific
685 force such clocks to be always-on nor does it reserve
689 information, see Documentation/driver-api/clk.rst.
691 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
708 [X86-32] pit,hpet,tsc;
715 [X86-64] hpet,tsc
721 architected timer so that code using WFE-based polling
735 clocksource-wdtest.holdoff= [KNL]
741 cma=nn[MG]@[start[MG][-end[MG]]]
752 Sets the size of kernel per-numa memory area for
754 per-numa CMA altogether. And If this option is not
756 With per-numa CMA enabled, DMA users on node nid will
783 com20020= [HW,NET] ARCnet - COM20020 chipset
787 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
791 ARCnet - COM90xx chipset (memory-mapped buffers)
820 See Documentation/admin-guide/serial-console.rst for more
835 $ ls -d /sys/bus/serial-base/devices/*:*.*/tty/*
836 /sys/bus/serial-base/devices/00:04:0.0/tty/ttyS0
849 Start an early, polled-mode console on the 8250/16550
852 MMIO inter-register address stride is either 8-bit
853 (mmio), 16-bit (mmio16), or 32-bit (mmio32).
857 the h/w is not re-initialized.
884 syscall, or to executing "dmesg -S --raw" or to reading
908 disable the cpuidle sub-system
914 disable the cpufreq sub-system
922 [X86,EARLY] Delay for N microsec between assert and de-assert
943 like Hyper-V, PowerPC (fadump) and AMD SEV-SNP.
951 [KNL, X86-64, ARM64, RISCV, LoongArch] Select a region
954 See Documentation/admin-guide/kdump/kdump.rst for further details.
959 start-[end] where start and end are both
961 Documentation/admin-guide/kdump/kdump.rst for an example.
964 [KNL, X86-64, ARM64, RISCV, LoongArch] range could be
972 [KNL, X86-64, ARM64, RISCV, LoongArch] range under 4G.
978 for 32-bit devices won't run out. Kernel would try to allocate
981 --> x86: max(swiotlb_size_or_default() + 8MiB, 256MiB)
982 --> arm64: 128MiB
983 --> riscv: 128MiB
984 --> loongarch: 128MiB
992 [KNL] Disable crypto self-tests
1000 csdlock_debug= [KNL] Enable or disable debug add-ons of cross-CPU
1015 See also Documentation/input/devices/joystick-parport.rst
1028 [KNL] verbose locking self-tests
1031 self-tests.
1033 (no extra messages), setting it to -1 (all bits set)
1034 will print _a_lot_ more information - normally only
1069 Format: { on, no-mount, off }
1071 no-mount:
1076 get a -EPERM as result when trying to register files
1080 Default value is set in build-time with a kernel configuration.
1092 Documentation/admin-guide/mm/hugetlbpage.rst.
1106 delayacct [KNL] Enable per-task delay accounting
1192 entries for DMA-API debugging code. One entry is
1193 required per DMA-API allocation. Use this if the
1194 DMA-API debugging code disables itself because the
1198 With this option the DMA-API debugging driver
1222 Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst
1247 Control how the dt_cpu_ftrs device-tree binding is
1257 what data is available or for reverse-engineering.
1262 Documentation/admin-guide/dynamic-debug-howto.rst
1273 determined by stdout-path property in device tree's
1278 Start an early, polled-mode console on a Cadence
1289 Start an early, polled-mode console on the 8250/16550
1291 MMIO inter-register address stride is either 8-bit
1292 (mmio) or 32-bit (mmio32 or mmio32be).
1302 Start an early, polled-mode console on a pl011 serial
1306 the driver will use only 32-bit accessors to read/write
1315 Start an early, polled-mode console on a meson serial
1321 Start an early, polled-mode console on an msm serial
1327 Start an early, polled-mode console on an msm serial
1333 Start an early, polled-mode console on a serial port
1339 Start an early, polled-mode console on a serial port
1345 Use RISC-V SBI (Supervisor Binary Interface) for early
1363 Start an early, polled-mode console on a lantiq serial
1377 Start an early, polled-mode, output-only console on the
1382 Start an early, polled-mode console on the
1388 Start an early, polled-mode console on a Qualcomm
1396 coherent non-x86 systems that use system memory for
1495 Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1512 elanfreq= [X86-32]
1520 See Documentation/admin-guide/kdump/kdump.rst for details.
1536 0 -- permissive (log only, no denials).
1537 1 -- enforcing (deny and log).
1570 See also Documentation/fault-injection/.
1574 See Documentation/admin-guide/sysctl/net.rst for
1578 See Documentation/admin-guide/blockdev/floppy.rst.
1580 forcepae [X86-32]
1587 fred= [X86-64]
1638 ftrace_filter=[function-list]
1640 tracer at boot up. function-list is a comma-separated
1645 ftrace_notrace=[function-list]
1647 function-list. This list can be changed at run time
1651 ftrace_graph_filter=[function-list]
1654 function-list is a comma-separated list of functions
1658 ftrace_graph_notrace=[function-list]
1660 function-list. This list is a comma-separated list of
1680 off -- Don't create device links from firmware info.
1681 permissive -- Create device links from firmware info
1684 on -- Create device links from firmware info and use it
1686 rpm -- Like "on", but also use to order runtime PM.
1699 strict -- Default. Continue waiting on consumers to
1701 timeout -- Give up waiting on consumers and call
1711 See also Documentation/input/devices/joystick-parport.rst
1715 gart_fix_e820= [X86-64,EARLY] disable the fix e820 for K8 GART
1741 gcov_persist= [GCOV] When non-zero (default), profiling data for
1751 gpio-mockup.gpio_mockup_ranges
1754 gpio-mockup.gpio_mockup_named_lines
1786 against bounds-checking flaws in the kernel's
1792 [KNL] Should the hard-lockup detector generate
1798 for 64-bit NUMA, off otherwise.
1806 corresponding firmware-first mode error processing
1816 during restoration read-only).
1853 hpet= [X86-32,HPET] option to control HPET usage
1870 number of pages to allocate per-node can be specified.
1871 See also Documentation/admin-guide/mm/hugetlbpage.rst.
1882 Documentation/admin-guide/mm/hugetlbpage.rst.
1893 boot-time allocation of gigantic hugepages is skipped.
1921 by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
1927 hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs.
1943 Set device-properties for ACPI-enumerated I2C-attached
1944 touchscreen, to e.g. fix coordinates of upside-down
1952 Omit "=<val>" entirely Set a boolean device-property
1953 Unsigned number Set a u32 device-property
1954 Anything else Set a string device-property
1957 i2c_touchscreen_props=GDIX1001:touchscreen-inverted-x:
1958 touchscreen-inverted-y
1960 i2c_touchscreen_props=MSSL1680:touchscreen-size-x=1920:
1961 touchscreen-size-y=1080:touchscreen-inverted-y:
1962 firmware-name=gsl1680-vendor-model.fw:silead,home-button
1967 (disabled by default, and as a pre-condition
1969 i8042.direct [HW] Put keyboard port into non-translated mode
1983 suspend-to-ram transitions, only during s2r
2007 -1 -- never invert brightness
2008 0 -- machine default
2009 1 -- force brightness inversion
2011 ia32_emulation= [X86-64]
2013 When true, allows loading 32-bit programs and executing 32-bit
2038 idle=nomwait: Disable mwait for CPU C-states
2066 legacy only accept legacy-NaN binaries, if supported
2068 2008 only accept 2008-NaN binaries, if supported
2079 'relaxed' straps the emulator for both legacy-NaN and
2080 2008-NaN, whereas 'strict' enables legacy-NaN only on
2089 Ignore loglevel setting - this will print /all/
2121 in crypto/hash_info.h.
2156 Formats: { "ima" | "ima-ng" | "ima-ngv2" | "ima-sig" |
2157 "ima-sigv2" }
2158 Default: "ima-ng"
2170 different crypto accelerators. This option can be used
2178 different crypto accelerators. This option can be used
2190 initcall_blacklist= [KNL] Do not execute a comma-separated list of
2191 initcall functions. Useful for debugging built-in
2236 0 -- basic integrity auditing messages. (Default)
2237 1 -- additional integrity auditing messages.
2265 could harm performance of some high-throughput
2274 1 to 9 specify maximum depth of C-state.
2283 algorithms for p-state selection. There are two
2284 P-state selection algorithms provided by
2287 on whether or not the hardware managed P-states
2294 used along with the hardware-managed P-states (HWP)
2298 in favor of acpi-cpufreq. Forcing the intel_pstate driver
2299 instead of acpi-cpufreq may disable platform features, such
2301 P-States information being indicated to OSPM and therefore
2304 or on platforms that use pcc-cpufreq instead of acpi-cpufreq.
2317 Allow per-logical-CPU P-State performance control limits using
2320 intremap= [X86-64,Intel-IOMMU,EARLY]
2325 BIOS x2APIC opt-out request will be ignored
2368 AMD Gart HW IOMMU-specific options:
2387 Do scatter-gather (SG) merging. Implies "force"
2391 Don't do scatter-gather (SG) merging.
2404 0 - Try to allocate a 32-bit DMA address first, before
2406 1 - Allocate directly from the full usable range,
2408 greater than 32-bit addressing.
2412 0 - Lazy mode.
2418 1 - Strict mode.
2421 unset - Use value of CONFIG_IOMMU_DEFAULT_DMA_{LAZY,STRICT}.
2423 legacy driver-specific options takes precedence.
2428 0 - Use IOMMU translation for DMA.
2429 1 - Bypass the IOMMU for DMA.
2430 unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
2432 io7= [HW] IO7 for Marvel-based Alpha systems
2447 See Documentation/admin-guide/nfs/nfsroot.rst.
2483 Enables support for pseudo-NMIs in the kernel. This
2502 [Deprecated - use cpusets instead]
2503 Format: [flag-list,]<cpu-list>
2536 "number of CPUs in system - 1".
2562 The format of <cpu-list> is described above.
2566 ivrs_ioapic [HW,X86-64]
2567 Provide an override to the IOAPIC-ID<->DEVICE-ID
2571 For example, to map IOAPIC-ID decimal 10 to
2577 * To map IOAPIC-ID decimal 10 to PCI device 00:14.0
2580 * To map IOAPIC-ID decimal 10 to PCI segment 0x1 and
2584 ivrs_hpet [HW,X86-64]
2585 Provide an override to the HPET-ID<->DEVICE-ID
2589 For example, to map HPET-ID decimal 10 to
2595 * To map HPET-ID decimal 0 to PCI device 00:14.0
2598 * To map HPET-ID decimal 10 to PCI segment 0x1 and
2602 ivrs_acpihid [HW,X86-64]
2603 Provide an override to the ACPI-HID:UID<->DEVICE-ID
2607 For example, to map UART-HID:UID AMD0020:0 to
2613 * To map UART-HID:UID AMD0020:0 to PCI segment is 0,
2616 * To map UART-HID:UID AMD0020:0 to PCI segment 0x1 and
2640 the kernel for non-movable allocations. The requested
2650 subsystem. Note that allocations like PTEs-from-HighMem
2658 for non-movable allocations and remaining memory is used
2669 gdb or control-c on the dbgp connection. When
2670 not using this parameter you use sysrq-g to break into
2675 or a supported polling keyboard driver (non-usb).
2702 Configure the RouterBoard 532 series on-chip
2705 kmemleak= [KNL,EARLY] Boot-time kmemleak enable/disable
2711 kprobe_event=[probe-list]
2713 The probe-list is a semicolon delimited list of probe
2743 execution by eliminating the write-protection faults
2764 kvm.enable_virt_at_load=[KVM,ARM64,LOONGARCH,MIPS,RISCV,X86]
2770 virtualization on-demand when creating and destroying
2778 is that doing so may interfere with using out-of-tree
2805 back to huge pages. If the value is a non-zero N, KVM will
2810 kvm-amd.nested= [KVM,AMD] Control nested virtualization feature in
2813 kvm-amd.npt= [KVM,AMD] Control KVM's use of Nested Page Tables,
2814 a.k.a. Two-Dimensional Page Tables. Default is 1
2818 kvm-arm.mode=
2824 nvhe: Standard nVHE-based mode, without support for
2827 protected: nVHE-based mode with support for guests whose
2830 nested: VHE-based mode with support for nested
2839 kvm-arm.vgic_v3_group0_trap=
2840 [KVM,ARM,EARLY] Trap guest accesses to GICv3 group-0
2843 kvm-arm.vgic_v3_group1_trap=
2844 [KVM,ARM,EARLY] Trap guest accesses to GICv3 group-1
2847 kvm-arm.vgic_v3_common_trap=
2851 kvm-arm.vgic_v4_enable=
2855 kvm-arm.wfe_trap_policy=
2864 kvm-arm.wfi_trap_policy=
2881 kvm-intel.ept= [KVM,Intel] Control KVM's use of Extended Page Tables,
2882 a.k.a. Two-Dimensional Page Tables. Default is 1
2886 kvm-intel.emulate_invalid_guest_state=
2888 state. Ignored if kvm-intel.enable_unrestricted_guest=1,
2894 kvm-intel.flexpriority=
2899 kvm-intel.nested=
2903 kvm-intel.unrestricted_guest=
2909 kvm-intel.vmentry_l1d_flush=[KVM,Intel] Mitigation for L1 Terminal Fault
2910 CVE-2018-3620.
2921 kvm-intel.vpid= [KVM,Intel] Control KVM's use of Virtual Processor
2941 on - enable the interface for the mitigation
3006 For details see: Documentation/admin-guide/hw-vuln/l1tf.rst
3012 lapic [X86-32,APIC,EARLY] Enable the local APIC even if BIOS
3016 value for LAPIC timer one-shot implementation. Default
3039 libata.force= [LIBATA] Force configurations. The format is a comma-
3051 first fan-out link behind PMP device. It does not
3065 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
3072 * rstonce: only attempt one reset during hot-unplug
3167 Specify the number of self-propagating call_rcu()
3175 occasional long-duration lock hold time. Defaults
3186 Set the number of locking read-acquisition kthreads.
3191 Set the number of locking write-acquisition kthreads.
3194 Set time (s) after boot for CPU-hotplug testing.
3197 Set time (s) between CPU-hotplug operations, or
3198 zero to disable CPU-hotplug testing.
3201 Do periodic testing of real-time lock priority
3206 non-real-time spinlocks, due to their disabling
3207 of preemption. Note that non-realtime mutexes
3220 Set task-shuffle interval (jiffies). Shuffling
3221 tasks allows some CPUs to go into dyntick-idle
3226 is useful for hands-off automated testing.
3245 Run the write-side locktorture kthreads at
3246 sched_set_fifo() real-time priority.
3264 7 (KERN_DEBUG) debug-level messages
3276 logo.nologo [FB] Disables display of the built-in Linux logo.
3294 an IEEE 1284-compliant printer is attached; if
3300 time-consuming boot-time autodetection (up to 250 ms per
3320 Example: machtype=lemote-yeeloong-2f-7inch
3332 (loop.max_loop) unconditionally pre-created at init time. The default
3335 devices can be requested on-demand with the
3336 /dev/loop-control interface.
3338 mce= [X86-{32,64}]
3375 do not opt-in to Local MCE delivery. Use legacy method
3396 don't overwrite the bios-set CMCI threshold. This boot
3405 force-enable recoverable machine check code paths
3411 See Documentation/admin-guide/md.rst.
3418 Control mitigation for the Micro-architectural Data
3433 full - Enable MDS mitigation on vulnerable CPUs
3434 full,nosmt - Enable MDS mitigation and disable
3436 off - Unconditionally disable MDS mitigation
3438 On TAA-affected machines, mds=off can be prevented by
3447 For details see: Documentation/admin-guide/hw-vuln/mds.rst
3462 [ARC,MICROBLAZE] - the limit applies only to low memory,
3465 [ARM64] - only limits memory covered by the linear
3478 [ARM,MIPS,EARLY] - override the memory layout
3485 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
3492 per-device physically contiguous DMA buffers.
3500 See Documentation/admin-guide/mm/memory-hotplug.rst.
3525 Example: Exclude memory from 0x18690000-0x1869ffff
3539 memmap=<size>%<offset>-<oldtype>+<newtype>
3541 from <oldtype> to <newtype>. If "-<oldtype>" is left
3556 repeatable BIOS-originated corruption always
3590 memtest= [KNL,X86,ARM,M68K,PPC,RISCV,EARLY] Enable memtest
3600 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
3606 Refer to Documentation/virt/kvm/x86/amd-memory-encryption.rst
3610 s2idle - Suspend-To-Idle
3611 shallow - Power-On Suspend or equivalent (if supported)
3612 deep - Suspend-To-RAM or equivalent (if supported)
3613 See Documentation/admin-guide/pm/sleep-states.rst.
3615 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
3631 0 - The attached screen is the 3.5" TFT
3632 1 - The attached screen is the 7" TFT
3633 2 - The VGA Shield is attached (1024x768)
3637 b - Enable backlight. The TFT backlight pin will be
3641 c - Enable the s3c camera interface.
3642 t - Reserved for enabling touchscreen support. The
3646 https://repo.or.cz/w/linux-2.6/mini2440.git
3651 arch-independent options, each of which is an
3652 aggregation of existing arch-specific options.
3681 ssbd=force-off [ARM64]
3694 have other ways of avoiding SMT-based attacks.
3729 full - Enable mitigation on vulnerable CPUs
3731 full,nosmt - Enable mitigation and disable SMT on
3734 off - Unconditionally disable mitigation
3747 Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst
3777 module_blacklist= [KNL] Do not load a comma-separated list of
3802 movable_node [KNL,EARLY] Boot-time switch to make hotplugable memory
3809 Format: <name>,<region-number>,<size>,<offset>
3812 <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
3851 something different and driver-specific.
3891 [NFS] enable 64-bit inode numbers.
3892 If zero, the NFS client will fake up a 32-bit inode
3894 of returning the full 64-bit number.
3895 The default is to return 64-bit inode numbers.
3930 [NFS4] Specify an additional fixed unique ident-
3961 driver. A non-zero value sets the minimum interval
3966 server-to-server copies for which this server is
3978 server-to-server copy, knfsd temporarily mounts
3985 See Documentation/admin-guide/nfs/nfsroot.rst.
3987 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
3988 See Documentation/admin-guide/nfs/nfsroot.rst.
3991 See Documentation/admin-guide/nfs/nfsroot.rst.
3995 NMI stack-backtrace request.
4004 0 - turn hardlockup detector in nmi_watchdog off
4005 1 - turn hardlockup detector in nmi_watchdog on
4006 rNNN - configure the watchdog with raw perf event 0xNNN
4019 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
4023 no4lvl [RISCV,EARLY] Disable 4-level and 5-level paging modes.
4024 Forces kernel to use 3-level paging instead.
4026 no5lvl [X86-64,RISCV,EARLY] Disable 5-level paging mode. Forces
4027 kernel to use 4-level paging instead.
4062 no_entry_flush [PPC,EARLY] Don't flush the L1-D cache when entering the kernel.
4064 noexec32 [X86-64]
4065 This affects only 32-bit executables.
4066 noexec32=on: enable non-executable mappings (default)
4068 noexec32=off: disable non-executable mappings
4079 nofxsr [BUGS=X86-32] Disables x86 floating point extended
4081 legacy floating-point registers on task switch.
4094 compared. However, if this command-line option is
4102 nohlt [ARM,ARM64,MICROBLAZE,MIPS,PPC,RISCV,SH] Forces the kernel to
4137 nointremap [X86-64,Intel-IOMMU,EARLY] Do not enable interrupt
4139 [Deprecated - use intremap=off]
4145 noirqdebug [X86-32] Disables the code which attempts to detect and
4155 no-kvmapf [X86,KVM,EARLY] Disable paravirtualized asynchronous page
4158 no-kvmclock [X86,KVM,EARLY] Disable paravirtualized KVM clock driver
4160 nolapic [X86-32,APIC,EARLY] Do not enable or use the local APIC.
4162 nolapic_timer [X86-32,APIC,EARLY] Do not use the local APIC timer.
4164 nomce [X86-32] Disable Machine Check Exception
4166 nomfgpt [X86-32] Disable Multi-Function General Purpose
4172 not load if they could possibly displace the pre-
4175 perform display-mode changes or accelerated rendering.
4188 nopcid [X86-64,EARLY] Disable the PCID cpu feature.
4193 nopti [X86-64,EARLY]
4209 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
4215 no-scroll [VGA] Disables scrollback.
4216 This is required for the Braillex ib80-piezo Braille
4219 nosgx [X86-64,SGX,EARLY] Disables Intel SGX kernel support.
4239 nosoftlockup [KNL] Disable the soft-lockup detector.
4245 nospectre_bhb [ARM64,EARLY] Disable all mitigations for Spectre-BHB (branch
4258 no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES,RISCV,LOONGARCH,EARLY]
4265 timer IRQ sources, i.e., the IO-APIC timer. This can
4270 [PPC,EARLY] Don't flush the L1-D cache after accessing user data.
4283 no-vmw-sched-clock
4288 soft-lockup and NMI watchdog (hard-lockup).
4292 nox2apic [X86-64,APIC,EARLY] Do not enable x2APIC mode.
4300 enabling legacy floating-point and sse state.
4322 n. So during boot up some boot time memory for per-cpu
4323 variables need be pre-allocated for later physical cpu
4328 numa=off [KNL, ARM64, PPC, RISCV, SPARC, X86, EARLY]
4333 [KNL, ARM64, RISCV, X86, EARLY]
4338 [KNL, ARM64, RISCV, X86, EARLY]
4343 [KNL, ARM64, RISCV, X86, EARLY]
4350 soft-reserved memory partitioning.
4352 numa_balancing= [KNL,ARM64,PPC,RISCV,S390,X86] Enable or disable automatic
4359 See Documentation/admin-guide/sysctl/vm.rst for details.
4362 See Documentation/core-api/debugging-via-ohci1394.rst for more
4377 onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration
4381 boundary - index of last SLC block on Flex-OneNAND.
4383 lock - Configure if Flex-OneNAND boundary should be locked.
4402 page_owner= [KNL,EARLY] Boot-time page_owner enabling option.
4408 page_poison= [KNL,EARLY] Boot-time parameter changing the state of
4436 See Documentation/admin-guide/tainted-kernels.rst for
4489 Set to non-zero to probe primary and secondary ISA
4495 Set to non-zero if a chip is present that snoops speed
4543 Set to non-zero to probe tertiary and further ISA
4559 Set to non-zero to probe QDI controllers. By default
4564 Set to non-zero to probe Winbond controllers. Use
4611 bios [X86-32] force use of PCI BIOS, don't access
4613 has a non-standard PCI host bridge.
4614 nobios [X86-32] disallow use of PCI BIOS, only direct
4620 data in IO port 0xCFC, both 32-bit).
4622 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
4623 the function, IO port 0xCFA, also 8-bit, sets
4625 through ports 0xC000-0xCFFF).
4632 root domains (aka PCI segments, in ACPI-speak).
4640 disable the use of MSI interrupts system-wide.
4645 primary IO-APIC for bridges that cannot disable
4652 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
4676 F0000h-100000h range.
4681 assign-busses [X86] Always assign all PCI bus
4702 <linux-pci@vger.kernel.org>.
4706 a bug to <linux-pci@vger.kernel.org>.
4718 bfsort Sort PCI devices into breadth-first order.
4721 nobfsort Don't sort PCI devices into breadth-first order.
4723 tuning and use the BIOS-configured MPS defaults.
4733 configuration allows peer-to-peer DMA between
4736 that hot-added devices will work.
4751 A PCI-PCI bridge can be specified if resource
4757 for 4096-byte alignment.
4759 end-to-end CRC checking). Only effective if
4790 noats [PCIE, Intel-IOMMU, AMD-IOMMU]
4821 bit-0 : ACS Source Validation
4822 bit-1 : ACS Translation Blocking
4823 bit-2 : ACS P2P Request Redirect
4824 bit-3 : ACS P2P Completion Redirect
4825 bit-4 : ACS Upstream Forwarding
4826 bit-5 : ACS P2P Egress Control
4827 bit-6 : ACS Direct Translated P2P
4837 Validation unchanged from whatever power-up
4849 system-wide.
4863 dpc-native Use native PCIe service for DPC only. May
4880 Keep all power-domains already enabled by bootloader on,
4898 pirq= [SMP,APIC] Manual mp-table setup
4899 See Documentation/arch/x86/i386/IO-APIC.rst.
4903 See also Documentation/admin-guide/parport.rst.
4922 CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time
4931 { on | off | curr | res | no-curr | no-res }
4976 none - Limited to cond_resched() calls
4977 voluntary - Limited to cond_resched() and might_sleep() calls
4978 full - Any section that isn't explicitly preempt disabled
4982 lazy - Scheduler controlled. Similar to full but instead
4988 print-fatal-signals=
4994 coredump - etc.
4997 you might want to try "ulimit -i unlimited".
5009 or lockdep-detected issues (only if lock debug is on).
5018 on - unlimited logging to /dev/kmsg from userspace
5019 off - logging to /dev/kmsg disabled
5020 ratelimit - ratelimit the logging
5031 - 'always': traditional behavior always allows mem overrides.
5032 - 'ptrace': only allow mem overrides for active ptracers.
5033 - 'never': never allow mem overrides.
5037 Limit processor to maximum C-state
5041 Ignore the _CST method to determine C-states,
5048 Param: "schedule" - profile schedule points.
5049 Param: "kvm" - profile VM exits.
5050 Param: <number> - step/bucket size as a power of 2 for
5081 pti= [X86-64] Control Page Table Isolation of user and
5086 on - unconditionally enable
5087 off - unconditionally disable
5088 auto - kernel detects whether your CPU model is
5094 [KNL] Number of legacy pty's. Overwrites compiled-in
5106 See Documentation/admin-guide/md.rst.
5109 See Documentation/admin-guide/blockdev/ramdisk.rst.
5128 cross-syscall address exposures. This is only
5134 ras=option[,option,...] [KNL] RAS-specific options
5140 rcu_nocbs[=cpu-list]
5145 enable the no-callback CPU mode, which prevents
5150 "p" for RCU-preempt, "s" for RCU-sched, and "g"
5154 and real-time workloads. It can also improve
5158 list of CPUs is set to no-callback mode from boot.
5162 no-callback mode from boot but the mode may be
5173 This improves the real-time response for the
5184 Do only a one-line RCU CPU stall warning when
5185 there is an ongoing too-long CSD-lock wait.
5191 If triggered before the RCU grace-period machinery
5201 RCU grace-period cleanup.
5205 RCU grace-period initialization.
5209 RCU grace-period pre-initialization, that is,
5210 the propagation of recent CPU-hotplug changes up
5214 Set delay from grace-period initialization to
5227 soliciting quiescent-state help from
5239 Set the SCHED_FIFO priority of the RCU per-CPU
5242 and for the RCU grace-period kthreads (rcu_bh,
5244 set, valid values are 1-99 and the default is 1
5245 (the least-favored priority). Otherwise, when
5246 RCU_BOOST is not set, valid values are 0-99 and
5247 the default is zero (non-realtime operation).
5252 On callback-offloaded (rcu_nocbs) CPUs,
5255 use of the ->nocb_bypass list. However, in the
5256 common non-flooded case, RCU queues directly to
5257 the main ->cblist in order to avoid the extra
5258 overhead of the ->nocb_bypass list and its lock.
5260 a single jiffy, RCU pre-queues the callbacks into
5261 the ->nocb_bypass queue. The definition of "too
5265 On callback-offloaded (rcu_nocbs) CPUs, avoid
5278 batch limiting is re-enabled.
5282 RCU's force-quiescent-state scan will aggressively
5290 Set the page-cache refill delay (in milliseconds)
5291 in response to low-memory conditions. The range
5295 Set the shift-right count to use to compute
5296 the callback-invocation batch limit bl from
5303 Please note that this callback-invocation batch
5304 limit applies only to non-offloaded callback
5313 cache-to-cache transfer latencies.
5319 and for NUMA systems with large remote-access
5335 the wakeup overhead on the global grace-period
5337 each group's NOCB grace-period kthread.
5340 Cause the grace-period kthread to get an extra
5342 it should at force-quiescent-state time.
5355 this specifies an rcu_read_unlock()-time delay
5359 of RCU-protected pointers after the relevant
5369 per-CPU rcuc kthreads. Defaults to a non-zero
5398 grace-period primitives such as call_rcu().
5409 grace-period primitives.
5412 Set test-start holdoff period. The purpose of
5430 Test the double-argument variant of kfree_rcu().
5432 rcuscale.kfree_rcu_test_single, both the single-
5433 and double-argument variants are tested.
5436 Test the single-argument variant of kfree_rcu().
5438 rcuscale.kfree_rcu_test_double, both the single-
5439 and double-argument variants are tested.
5453 does not affect the data-collection interval,
5458 Set number of RCU readers. The value -1 selects
5460 "n" less than -1 selects N-n+1, where N is again
5461 the number of CPUs. For example, -2 selects N
5462 (the number of CPUs), -3 selects N+1, and so on.
5463 A value of "n" less than or equal to -N selects
5476 complete. This is useful for hands-off automated
5483 Write-side holdoff between grace periods,
5488 Additional write-side holdoff between grace
5506 for RCU grace-period forward-progress testing
5513 Specify the fraction of a CPU-stall-warning
5514 period to do tight-loop forward-progress testing.
5518 forward-progress tests.
5522 need_resched() during tight-loop forward-progress
5526 Use conditional/asynchronous update-side
5527 normal-grace-period primitives, if available.
5530 Use conditional/asynchronous update-side
5531 expedited-grace-period primitives, if available.
5534 Use conditional/asynchronous update-side
5535 normal-grace-period primitives that also take
5540 Use conditional/asynchronous update-side
5541 expedited-grace-period primitives that also take
5565 Use expedited update-side primitives, if available.
5568 Use normal (non-expedited) asynchronous
5569 update-side primitives, if available.
5572 Use polled update-side normal-grace-period
5576 Use polled update-side expedited-grace-period
5580 Use polled update-side normal-grace-period
5585 Use polled update-side expedited-grace-period
5609 Use normal (non-expedited) synchronous
5610 update-side primitives, if available. If all
5614 they are all non-zero.
5622 Leak an RCU-protected pointer out of the reader.
5637 Set number of RCU callback-offload togglers.
5642 callback-offload toggling attempts.
5645 Set number of RCU readers. The value -1 selects
5646 N-1, where N is the number of CPUs. A value
5647 "n" less than -1 selects N-n-2, where N is again
5648 the number of CPUs. For example, -2 selects N
5649 (the number of CPUs), -3 selects N+1, and so on.
5652 Enable debug-object double-call_rcu() testing.
5655 Set time (s) after boot for CPU-hotplug testing.
5658 Set time (jiffies) between CPU-hotplug operations,
5659 or zero to disable CPU-hotplug testing.
5663 by a high-priority FIFO real-time task. Set to
5672 second) between preemptions by a high-priority
5673 FIFO real-time task. This delay is mediated
5678 The number of times in a given read-then-exit
5679 episode that a set of read-then-exit kthreads
5684 read-then-exit testing episodes.
5689 are entered from low-order bit up, and are
5691 0x1 bit is normal readers, 0x2 NMI-safe readers,
5692 and 0x4 light-weight readers.
5695 Set task-shuffle interval (s). Shuffling tasks
5696 allows some CPUs to go into dyntick-idle mode
5701 is useful for hands-off automated testing.
5710 any other stall-related activity. Note that
5716 in scheduling-while-atomic splats.
5735 grace-period kthread to test RCU CPU stall
5761 Test RCU's dyntick-idle handling. See also the
5816 Use expedited grace-period primitives, for
5820 real-time latency, and degrade energy efficiency.
5824 Use only normal grace-period primitives,
5827 real-time latency, CPU utilization, and
5829 increased grace-period latency. This parameter
5836 only normal grace-period primitives. No effect
5842 post-boot attempt at an expedited RCU grace
5843 period to instead use normal non-expedited
5844 grace-period processing.
5852 set to the default value of -1.
5855 Set the minimum number of callback-queuing-time
5856 lock-contention events per jiffy required to
5857 cause the RCU Tasks flavors to switch to per-CPU
5860 the default value of -1.
5865 of -1 allows this to be automatically (and
5873 number avoids disturbing real-time workloads,
5878 cancel laziness on that CPU. Use -1 to disable
5888 only printed prior to the stall-warning message
5936 force - Override the decision by the kernel to hide the
5975 There are some built-in platform specific "quirks"
5976 - you may see: "reboot: <name> series board detected.
5980 built-in quirk table, and use the generic default
6013 Set test-start holdoff period. The purpose of
6028 but the default has already reduced the per-pass
6033 Set number of readers. The default value of -1
6042 Set the read-side critical-section duration,
6046 Specify the read-protection implementation to test.
6072 See Documentation/admin-guide/cgroup-v1/cpusets.rst.
6102 reservetop= [X86-32,EARLY]
6119 See Documentation/power/swsusp-and-swap-files.rst
6135 AMD-based UNRET and IBPB mitigations alone do not stop
6137 sibling threads. For that reason, STIBP is used on pro-
6141 off - no mitigation
6142 auto - automatically select a migitation
6143 auto,nosmt - automatically select a mitigation,
6147 ibpb - On AMD, mitigate short speculation
6152 ibpb,nosmt - Like "ibpb" above but will disable SMT
6156 unret - Force enable untrained return thunks,
6157 only effective on AMD f15h-f17h based
6159 unret,nosmt - Like unret, but will disable SMT when STIBP
6184 riscv_isa_fallback [RISCV,EARLY]
6187 "riscv,isa" property on devicetree systems when the
6191 ro [KNL] Mount root device read-only on boot
6194 on Mark read-only kernel memory as read-only (default).
6195 off Leave read-only kernel memory writable for debugging.
6196 full Mark read-only kernel memory and aliases as read-only
6203 debug-uart get routed to the D+ and D- pins of the usb
6209 block/early-lookup.c for details.
6234 rw [KNL] Mount root device read-write on boot
6288 to 10 seconds for built-in smp_call_function()
6295 that requesting even small non-zero numbers of
6302 The default of -1 specifies a number of kthreads
6307 test before initiating CPU-hotplug operations.
6311 CPU-hotplug operations. Specifying zero (which
6312 is the default) disables CPU-hotplug operations.
6318 Non-zero values are useful for automated tests.
6341 "wait" parameter. A value of -1 selects the
6342 default if all other weights are -1. However,
6344 value of -1 will instead select a weight of zero.
6349 non-zero "wait" parameter. See weight_single.
6362 non-zero "wait" parameter. See weight_single
6374 non-zero "wait" parameter. See weight_single
6385 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
6386 1 -- enable.
6397 0 -- disable.
6398 1 -- enable.
6401 serialnumber [BUGS=X86-32]
6403 sev=option[,option...] [X86-64]
6409 Do not enable SEV-SNP (applies to host/hypervisor
6412 SEV-SNP guests.
6420 to set it to "all" by meaning -- no limit here.
6501 using the csdlock_debug- kernel parameter.
6506 system. By default, let CSD-lock acquisition
6508 for this value provides a 5-minute timeout.
6510 smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
6511 smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port
6512 smsc-ircc2.ircc_sir= [HW] SIR base I/O port
6513 smsc-ircc2.ircc_fir= [HW] FIR base I/O port
6514 smsc-ircc2.ircc_irq= [HW] IRQ line
6515 smsc-ircc2.ircc_dma= [HW] DMA channel
6516 smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
6526 Default: -1 (no limit)
6529 [KNL] Should the soft-lockup detector generate panics.
6532 A value of 1 instructs the soft-lockup detector
6533 to panic the machine when a soft-lockup occurs. It is
6536 respective build-time switch to that functionality.
6539 [KNL] Should the soft-lockup detector generate
6544 See Documentation/admin-guide/laptops/sonypi.rst
6551 on - (default) Enable the HW or SW mitigation as
6554 vmexit - On systems which don't have the HW mitigation
6557 protected from VM-originated BHI attacks, but
6559 off - Disable the mitigation.
6566 on - unconditionally enable, implies
6568 off - unconditionally disable, implies
6570 auto - kernel detects whether your CPU model is
6587 retpoline - replace indirect branches
6588 retpoline,generic - Retpolines
6589 retpoline,lfence - LFENCE; indirect branch
6590 retpoline,amd - alias for retpoline,lfence
6591 eibrs - Enhanced/Auto IBRS
6592 eibrs,retpoline - Enhanced/Auto IBRS + Retpolines
6593 eibrs,lfence - Enhanced/Auto IBRS + LFENCE
6594 ibrs - use IBRS to protect kernel
6604 on - Unconditionally enable mitigations. Is
6607 off - Unconditionally disable mitigations. Is
6610 prctl - Indirect branch speculation is enabled,
6616 - Like "prctl" above, but only STIBP is
6622 - Same as "prctl" above, but all seccomp
6627 - Like "seccomp" above, but only STIBP is
6632 auto - Kernel selects the mitigation depending on
6643 off - Disable mitigation
6644 microcode - Enable microcode mitigation only
6645 safe-ret - Enable sw-only safe RET mitigation (default)
6646 ibpb - Enable mitigation by issuing IBPB on
6648 ibpb-vmexit - Issue IBPB only on VMEXIT
6649 (cloud-specific mitigation)
6674 on - Unconditionally disable Speculative Store Bypass
6675 off - Unconditionally enable Speculative Store Bypass
6676 auto - Kernel detects whether the CPU model contains an
6682 prctl - Control Speculative Store Bypass per thread
6686 seccomp - Same as "prctl" above, but all seccomp threads
6694 on,auto - On Power8 and Power9 insert a store-forwarding
6698 off - No action.
6712 off - not enabled
6714 warn - the kernel will emit rate-limited warnings
6722 fatal - the kernel will send SIGBUS to applications
6727 ratelimit:N -
6747 Certain CPUs are vulnerable to an MDS-like
6767 This kernel-boot parameter defaults to 128,
6768 but takes effect only when the low-order four
6785 instead of the compile-time CONFIG_NR_CPUS.
6789 grace-period sequence counter wrap for the
6790 srcu_data structure's ->srcu_gp_seq_needed field.
6805 Specifies the number of no-delay instances
6812 Specifies the per-grace-period phase, number of
6813 non-sleeping polls of readers. Beyond this limit,
6819 Specifies number of microseconds of non-sleeping
6820 delay between each non-sleeping poll of readers.
6823 Specifies the number of update-side contention
6828 set for contention-based conversions to occur.
6838 force-on: Unconditionally enable mitigation for
6840 force-off: Unconditionally disable mitigation for
6863 stacktrace_filter=[function-list]
6865 will trace at boot up. function-list is a comma-separated
6873 Set the STI (builtin display/keyboard on the HP-PARISC
6875 as the initial boot-console.
6935 to global on non-NUMA machines)
6960 <int> -- Number of I/O TLB slabs
6961 <int> -- Second integer after comma. Number of swiotlb
6964 force -- force using of bounce buffers even if they
6966 noforce -- Never use bounce buffers (for debugging)
6981 Ignore sysrq setting - this boot parameter will
6989 cache size. See Documentation/networking/ip-sysctl.rst
6996 Specify "mem" (for Suspend-to-RAM) or "standby" (for
7001 wakeup-capable RTC alarm.
7007 -1: disable all active trip points in all thermal zones
7011 -1: disable all critical trip points in all thermal zones
7018 -1: disable all passive trip points
7024 <deci-seconds>: poll all this frequency
7028 Format: <size>[KMG],<size>[KMG]:<state>;<size>[KMG]-<size>[KMG]:<state>
7033 See Documentation/admin-guide/mm/transhuge.rst for more
7041 Format: <size>[KMG],<size>[KMG]:<policy>;<size>[KMG]-<size>[KMG]:<policy>
7047 See Documentation/admin-guide/mm/transhuge.rst for more
7059 Prevent the CPU-hotplug component of torturing
7063 Dump the ftrace buffer at torture-test shutdown,
7067 with rotating-rust storage.
7072 disables verbose-printk() sleeping.
7075 Duration of each verbose-printk() sleep in jiffies.
7100 https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/
7138 local - Use the per CPU time stamp counter
7142 global - Event time stamps are synchronize across
7145 counter - Simple counting of events (1, 2, ..)
7149 uptime - Use jiffies as the time stamp.
7150 perf - Use the same clock that perf uses.
7151 mono - Use ktime_get_mono_fast_ns() for time stamps.
7152 mono_raw - Use ktime_get_raw_fast_ns() for time
7154 boot - Use ktime_get_boot_fast_ns() for time stamps.
7158 trace_event=[event-list]
7160 to facilitate early boot debugging. The event-list is a
7161 comma-separated list of trace events to enable. See
7172 trace_instance=[instance-info]
7197 traceoff - Have the tracing instance tracing disabled after it is created.
7198 traceprintk - Have trace_printk() write into this trace instance
7243 trace_options=[option-list]
7245 The option-list is a comma delimited list of options
7259 trace_trigger=[trigger-list]
7296 See Documentation/admin-guide/mm/transhuge.rst
7303 See Documentation/admin-guide/mm/transhuge.rst
7310 See Documentation/admin-guide/mm/transhuge.rst
7318 - "tpm"
7319 - "tee"
7320 - "caam"
7321 - "dcp"
7331 - "kernel"
7332 - the same value as trusted.source: "tpm" or "tee"
7333 - "default"
7354 high-resolution timer mode on older hardware, and in
7390 on - Enable TSX on the system. Although there are
7393 several previous speculation-related CVEs, and
7397 off - Disable TSX on the system. (Note that this
7405 auto - Disable TSX if X86_BUG_TAA is present,
7410 See Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
7416 Similar to Micro-architectural Data Sampling (MDS)
7431 full - Enable TAA mitigation on vulnerable CPUs
7434 full,nosmt - Enable TAA mitigation and disable SMT on
7437 vulnerable to cross-thread TAA attacks.
7438 off - Unconditionally disable TAA mitigation
7440 On MDS-affected machines, tsx_async_abort=off can be
7452 Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
7458 See also Documentation/input/devices/joystick-parport.rst
7460 udbg-immortal [PPC] When debugging early kernel crashes that
7466 Set number of hash buckets for UDP/UDP-Lite connections
7468 uhci-hcd.ignore_oc=
7470 Some badly-designed motherboards generate lots of
7479 unwind_debug [X86-64,EARLY]
7487 (default -1 = authorized (same as 1),
7493 for newly-detected USB devices (default 2). This
7521 [USB] Specifies timeout for the initial 64-byte
7528 [USB] A list of quirk entries to augment the built-in
7531 VendorID:ProductID:Flags. The IDs are 4-digit hex
7533 will change the built-in quirk; setting it if it is
7538 a 255-byte read);
7542 Set-Interface requests);
7561 (bInterval-1).
7599 usb-storage.delay_use=
7606 usb-storage.quirks=
7608 override the built-in unusual_devs list. List
7611 and Product ID values (4-digit hex numbers) and
7613 to a common usb-storage quirk flag as follows:
7655 medium is write-protected).
7664 1 - undefined instruction events
7665 2 - system calls
7666 4 - invalid data aborts
7667 8 - SIGSEGV faults
7668 16 - SIGBUS faults
7684 vdso32= [X86] Control the 32-bit vDSO
7685 vdso32=1: enable 32-bit VDSO
7686 vdso32=0 or vdso32=2: disable 32-bit VDSO
7696 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
7727 vga= [BOOT,X86-32] Select a particular video mode
7729 Documentation/admin-guide/svga.rst.
7744 - Disable all of the above options
7753 parisc, m64k, powerpc, riscv, sh, um, xtensa, s390, sparc).
7768 vsyscall= [X86-64,EARLY]
7771 code). Most statically-linked binaries and older
7795 see vga-softcursor.rst. Default: 2 = underline.
7800 This is a 16-member array composed of values
7801 ranging from 0-255.
7806 This is a 16-member array composed of values
7807 ranging from 0-255.
7812 This is a 16-member array composed of values
7813 ranging from 0-255.
7818 Set system-wide default UTF-8 mode for all tty's.
7819 Default is 1, i.e. UTF-8 mode is enabled for all
7824 Format=<-1|0|1>
7825 Set system-wide default for whether a cursor
7826 is shown on new VTs. Default is -1,
7831 vt.italic= [VT] Default color for italic text; 0-15.
7834 vt.underline= [VT] Default color for underlined text; 0-15.
7838 see Documentation/watchdog/watchdog-parameters.rst
7839 or other driver-specific files in the
7853 Format: <cpu-list>
7874 Per-cpu work items which run for longer than this
7877 them from noticeably delaying other per-cpu work
7895 Per-cpu workqueues are generally preferred because
7897 locality; unfortunately, per-cpu workqueues tend to
7900 Enabling this makes the per-cpu workqueues which
7914 Documentation/core-api/workqueue.rst.
7927 forces round-robin CPU selection to flush out
7935 on - Enable writecombine, use WUC for ioremap_wc()
7936 off - Disable writecombine, use SUC for ioremap_wc()
7938 x2apic_phys [X86-64,APIC,EARLY] Use x2apic physical mode instead of
7942 xen_512gb_limit [KNL,X86-64,XEN]
7952 ide-disks -- unplug primary master IDE devices
7953 aux-ide-disks -- unplug non-primary-master IDE devices
7954 nics -- unplug network devices
7955 all -- unplug all emulated devices (NICs and IDE disks)
7956 unnecessary -- unplugging emulated devices is
7959 never -- do not unplug even if version check succeeds
7973 Select whether to always use non-faulting (safe) MSR
7993 xen_timer_slop= [X86-64,XEN,EARLY]
8018 preferred over the 2-level event handling, as it is
8035 xive.store-eoi=off [PPC]
8041 xhci-hcd.quirks [USB,KNL]