Lines Matching +full:boot +full:- +full:enabled
1 # SPDX-License-Identifier: GPL-2.0
4 bool "64-bit kernel" if "$(ARCH)" = "x86"
7 Say yes to build a 64-bit kernel - formerly known as x86_64
8 Say no to build a 32-bit kernel - formerly known as i386
13 # Options that are inherently 32-bit kernel only:
27 # Options that are inherently 64-bit kernel only:
55 # ported to 32-bit as well. )
150 # Word-size accesses may read uninitialized data past the trailing \0
329 default "elf32-i386" if X86_32
330 default "elf64-x86-64" if X86_64
424 …default $(success,$(srctree)/scripts/gcc-x86_64-has-stack-protector.sh $(CC) $(CLANG_FLAGS)) if 64…
425 default $(success,$(srctree)/scripts/gcc-x86_32-has-stack-protector.sh $(CC) $(CLANG_FLAGS))
429 the segment on 32-bit kernels.
434 bool "Symmetric multi-processing support"
440 If you say N here, the kernel will run on uni- and multiprocessor
455 See also <file:Documentation/arch/x86/i386/IO-APIC.rst>,
456 <file:Documentation/admin-guide/lockup-watchdogs.rst> and the SMP-HOWTO available at
467 This allows 32-bit apic IDs (so it can support very large systems),
472 enabled in the BIOS. They will boot with very reduced functionality
478 bool "Enable MSI and MSI-x delivery by posted interrupts"
521 When enabled, try to use Flexible Return and Event Delivery
533 bool "Support for extended (non-PC) x86 platforms"
541 for the following non-PC x86 platforms, depending on the value of
544 32-bit platforms (CONFIG_64BIT=n):
547 RDC R-321x SoC
549 STA2X11-based (e.g. Northville)
552 64-bit platforms (CONFIG_64BIT=y):
558 generic distribution kernel, say Y here - otherwise say N.
571 Adds support for Numascale NumaChip large-SMP systems. Needed to
584 supposed to run on these EM64T-based machines. Only choose this option
695 - BayTrail
696 - Braswell
697 - Quark
715 bool "RDC R-321x SoC"
721 This option is needed for RDC R-321x system-on-chip, also known
722 as R-8610-(G).
726 bool "Support non-standard 32-bit SMP architectures"
741 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
742 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
753 This adds support for boards based on the STA2X11 IO-Hub,
756 option is selected the kernel will still be able to boot on
774 prompt "Single-depth WCHAN output"
787 Say Y here to enable options for running Linux under various hyper-
809 bool "paravirt-ops debugging"
820 spinlock implementation with something virtualization-friendly
857 as specified in the x86/HVM direct boot ABI.
874 bool "Jailhouse non-root cell support"
878 This option allows to run Linux as guest in a Jailhouse non-root
888 a flexible, lightweight reference open-source hypervisor, built with
889 real-time and safety-criticality in mind. It is built for embedded
890 IOT with small footprint and real-time features. More details can be
894 bool "Intel TDX (Trust Domain Extensions) - Guest Support"
904 the guest kernel can not boot or run under TDX.
918 Use the IA-PC HPET (High Precision Event Timer) to manage
924 as it is off-chip. The interface used is documented
944 Enabled scanning of DMI to identify machine quirks. Say Y
958 The GART supports full DMA access for devices with 32-bit access
967 32-bit limited device.
975 of VESA video modes set at an early boot stage via the vga= parameter.
992 # The ranges are different on 32-bit and 64-bit kernels, depending on
995 # ( If MAXSMP is enabled we just use the highest possible value and disable
1039 kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum
1054 by sharing mid-level caches, last-level cache tags or internal
1062 prompt "Multi-core scheduler support"
1065 Multi-core scheduler support improves the CPU scheduler's decision
1066 making when dealing with multi-core CPU chips at a cost of slightly
1077 Intel Turbo Boost Max Technology 3.0 enabled CPUs have a
1101 integrated interrupt controller in the CPU. If you have a single-CPU
1105 all. The local APIC supports CPU-generated self-interrupts (timer,
1110 bool "IO-APIC support on uniprocessors"
1113 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
1114 SMP-capable replacement for PC-style interrupt controllers. Most
1117 If you have a single-CPU system with an IO-APIC, you can say Y here
1119 an IO-APIC, then the kernel will still run with no slowdown at all.
1138 bool "Reroute for broken boot IRQs"
1144 superfluous "boot interrupts" cannot be disabled.
1146 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
1147 entry in the chipset's IO-APIC is masked (as, e.g. the RT
1149 boot IRQ generation cannot be disabled, this workaround keeps
1150 the original IRQ line masked so that only the equivalent "boot
1152 kernel to set up the IRQ handler on the boot IRQ line. In this
1199 systems. These typically need to be enabled explicitly on the command
1221 mode, which is an 80286-era approximation of 16-bit real mode.
1229 a 16-bit DOS program where 16-bit performance matters, vm86
1233 Note that any app that works on a 64-bit kernel is unlikely to
1234 need this option, as 64-bit kernels don't, and can't, support
1235 V8086 mode. This option is also unrelated to 16-bit protected
1236 mode and is not needed to run most 16-bit programs under Wine.
1248 bool "Enable support for 16-bit segments" if EXPERT
1252 This option is required by programs like Wine to run 16-bit
1255 plus 16K runtime memory on x86-64,
1328 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
1375 tristate "/dev/cpu/*/msr - Model-specific register support"
1378 Model-Specific Registers (MSRs). It is a character device with
1380 MSR accesses are directed to a specific CPU on multi-processor
1384 tristate "/dev/cpu/*/cpuid - CPU information support"
1400 However, the address space of 32-bit x86 processors is only 4
1419 PAE implements 3-level paging on IA32 processors. PAE is fully
1422 then the kernel will not boot on CPUs that don't support PAE!
1427 your boot loader (lilo or loadlin) about how to pass options to the
1428 kernel at boot time.)
1435 Select this if you have a 32-bit processor and between 1 and 4
1443 Select this if you have a 32-bit processor and more than 4
1462 will also likely make your kernel incompatible with binary-only
1502 larger swapspace support for non-overcommit purposes. It
1507 bool "Enable 5-level page tables support"
1513 5-level paging enables access to larger address space:
1519 A kernel with the option enabled can be booted on machines that
1520 support 4- or 5-level paging.
1522 See Documentation/arch/x86/x86_64/5level-paging.rst for more
1534 that we have them enabled.
1573 Enable NUMA (Non-Uniform Memory Access) support.
1579 For 64-bit this is recommended if the system is Intel Core i7
1582 For 32-bit this is only needed if you boot a 32-bit
1583 kernel on a 64-bit NUMA platform.
1639 See Documentation/admin-guide/mm/memory-hotplug.rst for more information.
1655 tristate "Support non-standard NVDIMMs and ADR protected memory"
1662 Treat memory marked using the non-standard e820 type of 12 as used
1663 by the Intel Sandy Bridge-EP reference BIOS as protected memory.
1670 bool "Allocate 3rd-level pagetables from highmem"
1675 low memory. Setting this option will put user-space page table
1682 is suspected to be caused by BIOS. Even when enabled in the
1688 Documentation/admin-guide/kernel-parameters.rst to adjust this.
1690 When enabled with the default parameters, this option has
1696 BIOS-originated corruption always affects the same memory,
1716 a 487DX or 387, respectively. (The messages during boot time can
1724 is broken. Try "man bootparam" or see the documentation of your boot
1726 boot time.) This means that it is a good idea to say Y here if you
1730 emulation can be found in <file:arch/x86/math-emu/README>.
1742 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1756 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1758 write-combining. All of these processors are supported by this code
1762 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1785 int "MTRR cleanup enable value (0-1)"
1793 int "MTRR cleanup spare reg num (0-7)"
1812 Say N here if you see bootup problems (boot crash, boot hang,
1813 spontaneous reboots) or a non-working video driver.
1822 some x86 processors. If enabled, a general protection fault is
1829 specific cases in protected and virtual-8086 modes. Emulated
1836 # https://github.com/llvm/llvm-project/commit/e0b89df2e0f0130881bf6c39bf31d7f6aac00e0f
1837 # https://github.com/llvm/llvm-project/commit/dfcf69770bc522b9e411c66454934a37c1f35332
1838 def_bool ((CC_IS_GCC && $(cc-option, -fcf-protection=branch -mindirect-branch-register)) || \
1840 $(as-instr,endbr64)
1851 # https://github.com/llvm/llvm-project/commit/9d7001eba9c4cb311e03cd8cdc231f9e579f2d0f
1857 hardware support course-grain forward-edge Control Flow Integrity
1872 # Note: only available in 64-bit mode
1878 page-based protections, but without requiring modification of the
1881 For details, see Documentation/core-api/protection-keys.rst
1902 Therefore TSX is not enabled by default (aka tsx=off). An admin
1904 Even with TSX enabled, the kernel will attempt to enable the best
1909 and =auto. See Documentation/admin-guide/kernel-parameters.txt for more
1919 TSX is disabled if possible - equals to tsx=off command line parameter.
1924 TSX is always enabled on TSX capable HW - equals the tsx=on command
1930 TSX is enabled on TSX capable HW that is believed to be safe against
1931 side channel attacks- equals the tsx=auto command line parameter.
1961 Applications must be enabled to use it, and old userspace does not
2002 resultant kernel should continue to boot on existing non-EFI
2013 See Documentation/admin-guide/efi-stub.rst for more information.
2033 bool "EFI mixed-mode support"
2036 Enabling this feature allows a 64-bit kernel to be booted
2037 on a 32-bit firmware, provided that your CPU supports 64-bit
2040 Note that it is not possible to boot a mixed-mode enabled
2041 kernel via the EFI boot stub - a bootloader that supports
2050 Export EFI runtime memory regions to /sys/firmware/efi/runtime-map.
2054 See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map.
2105 by the boot loader. The only exception is if it is loaded below the
2123 command line boot parameter passed to the panic-ed
2124 kernel. Please take a look at Documentation/admin-guide/kdump/kdump.rst
2166 On 64-bit, the kernel physical and virtual addresses are
2173 On 32-bit, the kernel physical and virtual addresses are
2204 If bootloader loads the kernel at a non-aligned address and
2208 If bootloader loads the kernel at a non-aligned address and
2216 On 32-bit this value must be a multiple of 0x2000. On 64-bit
2225 __PAGE_OFFSET movable during boot.
2266 to 64-bit linear addresses, allowing software to use of the
2278 prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)"
2282 presented with a 32-bit vDSO that is not mapped at the address
2292 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
2294 Saying Y here changes the default value of the vdso32 boot
2295 option from 1 to 0, which turns off the 32-bit vDSO entirely.
2311 This setting can be changed at boot time via the kernel command
2313 is deprecated and can only be enabled using the kernel command
2330 certain uses of the vsyscall area as an ASLR-bypassing
2345 bool "Built-in kernel command line"
2347 Allow for specifying boot arguments to the kernel at
2350 kernel boot arguments with the kernel itself (that is,
2351 to not rely on the boot loader to provide them.)
2355 boot arguments in CONFIG_CMDLINE.
2357 Systems with fully functional boot loaders (i.e. non-embedded)
2361 string "Built-in kernel command string"
2366 image and used at boot time. If the boot loader provides a
2367 command line at boot time, it is appended to this string to
2373 In most cases, the command line (whether built-in or provided
2374 by the boot loader) should specify the device for the root
2378 bool "Built-in command line overrides boot loader arguments"
2381 Set this option to 'Y' to have the kernel ignore the boot loader
2382 command line, and use ONLY the built-in command line.
2384 This is used to work around broken boot loaders. This should
2391 Linux can allow user programs to install a per-process x86
2393 call. This is required to run 16-bit or segmented code such as
2398 context switches and increases the low-level kernel attack
2420 bool "Attempt to use FineIBT by default at boot time"
2424 Attempt to use FineIBT by default at boot time. If enabled,
2433 def_bool $(success,echo 'int __seg_fs fs; int __seg_gs gs;' | $(CC) -x c - -S -o /dev/null)
2443 # -fsanitize=kernel-address (KASAN) and -fsanitize=thread
2445 # GCC < 13.3 - see GCC PR sanitizer/111736.
2450 def_bool $(cc-option,-mharden-sls=all)
2453 def_bool $(cc-option,-mfunction-return=thunk-extern)
2456 def_bool $(cc-option,-fpatchable-function-entry=16,16)
2466 # Basically: FUNCTION_ALIGNMENT - 5*CFI_CLANG
2528 kernel-to-user data leaks by avoiding speculative indirect
2529 branches. Requires a compiler with -mindirect-branch=thunk-extern
2533 bool "Enable return-thunks"
2538 Compile the kernel with the return-thunks compiler option to guard
2539 against kernel-to-user data leaks by avoiding return speculation.
2540 Requires a compiler with -mfunction-return=thunk-extern
2558 SKL Return-Speculation-Buffer (RSB) underflow issue. The
2559 mitigation is off by default and needs to be enabled on the
2561 non-affected systems the overhead of this option is marginal as
2562 the call depth tracking is using run-time generated call thunks
2576 trouble shooting. The debug prints need to be enabled on the
2577 kernel command line with 'debug-callthunks'.
2602 Enable the SRSO mitigation needed on AMD Zen1-4 machines.
2605 bool "Mitigate Straight-Line-Speculation"
2610 Compile the kernel with straight-line-speculation options to guard
2633 See also <file:Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst>
2636 bool "Mitigate Spectre-BHB (Branch History Injection)"
2643 See <file:Documentation/admin-guide/hw-vuln/spectre.rst>
2653 See also <file:Documentation/admin-guide/hw-vuln/mds.rst>
2664 See also <file:Documentation/admin-guide/hw-vuln/tsx_async_abort.rst>
2672 Stale Data Vulnerabilities are a class of memory-mapped I/O (MMIO)
2676 <file:Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst>
2686 See <file:Documentation/admin-guide/hw-vuln/l1tf.rst
2709 See also <file:Documentation/admin-guide/hw-vuln/spectre.rst>
2721 See also <file:Documentation/admin-guide/hw-vuln/spectre.rst>
2735 <file:Documentation/admin-guide/hw-vuln/special-register-buffer-data-sampling.rst>
2774 battery status information, and user-space programs will receive
2778 BIOS by passing the "apm=off" option to the kernel at boot time.
2784 and more information, read <file:Documentation/power/apm-acpi.rst>
2785 and the Battery Powered Linux mini-HOWTO, available from
2790 VESA-compliant "green" monitors.
2795 may cause those machines to panic during the boot phase.
2807 enabled.
2835 bool "Enable PM at boot time"
2837 Enable APM features at boot time. From page 36 of the APM BIOS
2842 feature is turned off -- see "Do CPU IDLE calls", below). This
2845 this option off if your computer hangs at boot time when using APM
2859 333 mS). On some machines, this will cause a hang at boot time or
2871 do with your VESA-compliant power-saving monitor. Further, this
2872 option doesn't work for all laptops -- it might not turn off your
2882 needs to. Unfortunately, some BIOSes do not -- especially those in
2906 PCI-based systems don't have any BIOS at all. Linux can also try to
2927 bool "OLPC XO-1"
2939 # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
2981 architectures -- if your target machine is modern, it probably does
2986 # x86_64 have no ISA slots, but can have ISA-style DMA.
2988 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2991 Enables ISA-style DMA support for devices requiring such controllers.
3010 PCI-IDs of several on-chip devices, so its a good dependency
3016 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
3020 This driver provides a clocksource built upon the on-chip
3021 27MHz high-resolution timer. Its also a workaround for
3022 NSC Geode SC-1100's buggy TSC, which loses time when the
3024 other workaround is idle=poll boot option.
3039 bool "OLPC XO-1 Power Management"
3042 Add support for poweroff and suspend of the OLPC XO-1 laptop.
3045 bool "OLPC XO-1 Real Time Clock"
3048 Add support for the XO-1 real time clock, which can be used as a
3052 bool "OLPC XO-1 SCI extras"
3057 Add support for SCI-based features of the OLPC XO-1 laptop:
3058 - EC-driven system wakeups
3059 - Power button
3060 - Ebook switch
3061 - Lid switch
3062 - AC adapter status updates
3063 - Battery status updates
3066 bool "OLPC XO-1.5 SCI extras"
3070 Add support for SCI-based features of the OLPC XO-1.5 laptop:
3071 - EC-driven system wakeups
3072 - AC adapter status updates
3073 - Battery status updates
3109 bool "Technologic Systems TS-5500 platform support"
3115 This option enables system support for the Technologic Systems TS-5500.
3134 Include code to run legacy 32-bit programs under a
3135 64-bit kernel. You should likely turn this on, unless you're
3136 100% sure that you don't have any 32-bit programs left.
3143 Make IA32 emulation disabled by default. This prevents loading 32-bit
3144 processes and access to 32-bit syscalls. If unsure, leave it to its
3148 bool "x32 ABI for 64-bit mode"
3150 # llvm-objcopy does not convert x86_64 .note.gnu.property or
3154 depends on $(success,$(OBJCOPY) --version | head -n1 | grep -qv llvm)
3156 Include code to run binaries for the x32 native 32-bit ABI
3157 for 64-bit processors. An x32 process gets access to the
3158 full 64-bit register file and wide data path while leaving