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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:
26 # Options that are inherently 64-bit kernel only:
50 # ported to 32-bit as well. )
252 string
253 default "elf32-i386" if X86_32
254 default "elf64-x86-64" if X86_64
376 default $(success,$(srctree)/scripts/gcc-x86_64-has-stack-protector.sh $(CC)) if 64BIT
377 default $(success,$(srctree)/scripts/gcc-x86_32-has-stack-protector.sh $(CC))
388 DMA memory allocation support allows devices with less than 32-bit
395 bool "Symmetric multi-processing support"
401 If you say N here, the kernel will run on uni- and multiprocessor
416 See also <file:Documentation/x86/i386/IO-APIC.rst>,
417 <file:Documentation/admin-guide/lockup-watchdogs.rst> and the SMP-HOWTO available at
423 bool "Processor feature human-readable names" if EMBEDDED
439 This allows 32-bit apic IDs (so it can support very large systems),
485 bool "Support for extended (non-PC) x86 platforms"
493 for the following (non-PC) 32 bit x86 platforms:
496 RDC R-321x SoC
498 STA2X11-based (e.g. Northville)
502 generic distribution kernel, say Y here - otherwise say N.
507 bool "Support for extended (non-PC) x86 platforms"
515 for the following (non-PC) 64 bit x86 platforms:
521 generic distribution kernel, say Y here - otherwise say N.
534 Adds support for Numascale NumaChip large-SMP systems. Needed to
547 supposed to run on these EM64T-based machines. Only choose this option
661 - BayTrail
662 - Braswell
663 - Quark
681 bool "RDC R-321x SoC"
687 This option is needed for RDC R-321x system-on-chip, also known
688 as R-8610-(G).
692 bool "Support non-standard 32-bit SMP architectures"
707 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
708 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
719 This adds support for boards based on the STA2X11 IO-Hub,
740 prompt "Single-depth WCHAN output"
753 Say Y here to enable options for running Linux under various hyper-
754 visors. This option enables basic hypervisor detection and platform
774 bool "paravirt-ops debugging"
785 spinlock implementation with something virtualization-friendly
839 bool "Jailhouse non-root cell support"
843 This option allows to run Linux as guest in a Jailhouse non-root
853 a flexible, lightweight reference open-source hypervisor, built with
854 real-time and safety-criticality in mind. It is built for embedded
855 IOT with small footprint and real-time features. More details can be
866 Use the IA-PC HPET (High Precision Event Timer) to manage
872 as it is off-chip. The interface used is documented
894 as it is off-chip. APB timers are always running regardless of CPU
919 The GART supports full DMA access for devices with 32-bit access
928 32-bit limited device.
947 # The ranges are different on 32-bit and 64-bit kernels, depending on
1006 prompt "Multi-core scheduler support"
1009 Multi-core scheduler support improves the CPU scheduler's decision
1010 making when dealing with multi-core CPU chips at a cost of slightly
1044 integrated interrupt controller in the CPU. If you have a single-CPU
1048 all. The local APIC supports CPU-generated self-interrupts (timer,
1053 bool "IO-APIC support on uniprocessors"
1056 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
1057 SMP-capable replacement for PC-style interrupt controllers. Most
1060 If you have a single-CPU system with an IO-APIC, you can say Y here
1062 an IO-APIC, then the kernel will still run with no slowdown at all.
1084 entry in the chipset's IO-APIC is masked (as, e.g. the RT
1162 mode, which is an 80286-era approximation of 16-bit real mode.
1170 a 16-bit DOS program where 16-bit performance matters, vm86
1174 Note that any app that works on a 64-bit kernel is unlikely to
1175 need this option, as 64-bit kernels don't, and can't, support
1176 V8086 mode. This option is also unrelated to 16-bit protected
1177 mode and is not needed to run most 16-bit programs under Wine.
1189 bool "Enable support for 16-bit segments" if EXPERT
1193 This option is required by programs like Wine to run 16-bit
1196 plus 16K runtime memory on x86-64,
1265 dell-smm-hwmon driver. Character file /proc/i8k reports bios version,
1286 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
1310 need to add the vendor-supplied microcode to the CONFIG_EXTRA_FIRMWARE
1345 tristate "/dev/cpu/*/msr - Model-specific register support"
1348 Model-Specific Registers (MSRs). It is a character device with
1350 MSR accesses are directed to a specific CPU on multi-processor
1354 tristate "/dev/cpu/*/cpuid - CPU information support"
1370 However, the address space of 32-bit x86 processors is only 4
1389 PAE implements 3-level paging on IA32 processors. PAE is fully
1395 auto detected or can be forced by using a kernel command line option
1405 Select this if you have a 32-bit processor and between 1 and 4
1413 Select this if you have a 32-bit processor and more than 4
1432 will also likely make your kernel incompatible with binary-only
1472 larger swapspace support for non-overcommit purposes. It
1477 bool "Enable 5-level page tables support"
1483 5-level paging enables access to larger address space:
1490 support 4- or 5-level paging.
1492 See Documentation/x86/x86_64/5level-paging.rst for more
1548 Enable NUMA (Non-Uniform Memory Access) support.
1554 For 64-bit this is recommended if the system is Intel Core i7
1557 For 32-bit this is only needed if you boot a 32-bit
1558 kernel on a 64-bit NUMA platform.
1564 prompt "Old style AMD Opteron NUMA detection"
1567 Enable AMD NUMA node topology detection. You should say Y here if
1575 prompt "ACPI NUMA detection"
1579 Enable ACPI SRAT based node topology detection.
1622 See Documentation/admin-guide/mm/memory-hotplug.rst for more information.
1638 tristate "Support non-standard NVDIMMs and ADR protected memory"
1645 Treat memory marked using the non-standard e820 type of 12 as used
1646 by the Intel Sandy Bridge-EP reference BIOS as protected memory.
1653 bool "Allocate 3rd-level pagetables from highmem"
1658 low memory. Setting this option will put user-space page table
1671 Documentation/admin-guide/kernel-parameters.rst to adjust this.
1679 BIOS-originated corruption always affects the same memory,
1742 emulation can be found in <file:arch/x86/math-emu/README>.
1754 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1768 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1770 write-combining. All of these processors are supported by this code
1797 int "MTRR cleanup enable value (0-1)"
1805 int "MTRR cleanup spare reg num (0-7)"
1824 spontaneous reboots) or a non-working video driver.
1864 specific cases in protected and virtual-8086 modes. Emulated
1870 # Note: only available in 64-bit mode
1876 page-based protections, but without requiring modification of the
1879 For details, see Documentation/core-api/protection-keys.rst
1903 and =auto. See Documentation/admin-guide/kernel-parameters.txt for more
1906 Say off if not sure, auto if TSX is in use but it should be used on safe
1913 TSX is disabled if possible - equals to tsx=off command line parameter.
1918 TSX is always enabled on TSX capable HW - equals the tsx=on command
1922 bool "auto"
1925 side channel attacks- equals the tsx=auto command line parameter.
1942 resultant kernel should continue to boot on existing non-EFI
1948 depends on $(cc-option,-mabi=ms) || X86_32
1954 See Documentation/admin-guide/efi-stub.rst for more information.
1957 bool "EFI mixed-mode support"
1960 Enabling this feature allows a 64-bit kernel to be booted
1961 on a 32-bit firmware, provided that your CPU supports 64-bit
1964 Note that it is not possible to boot a mixed-mode enabled
1965 kernel via the EFI boot stub - a bootloader that supports
2040 which are loaded in the main kernel with kexec-tools into
2046 For more details see Documentation/admin-guide/kdump/kdump.rst
2082 command line boot parameter passed to the panic-ed
2083 kernel. Please take a look at Documentation/admin-guide/kdump/kdump.rst
2125 On 64-bit, the kernel physical and virtual addresses are
2132 On 32-bit, the kernel physical and virtual addresses are
2163 If bootloader loads the kernel at a non-aligned address and
2167 If bootloader loads the kernel at a non-aligned address and
2175 On 32-bit this value must be a multiple of 0x2000. On 64-bit
2268 prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)"
2272 presented with a 32-bit vDSO that is not mapped at the address
2282 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
2285 option from 1 to 0, which turns off the 32-bit vDSO entirely.
2314 address mapping. This makes the mapping non-executable, but
2332 certain uses of the vsyscall area as an ASLR-bypassing
2347 bool "Built-in kernel command line"
2359 Systems with fully functional boot loaders (i.e. non-embedded)
2363 string "Built-in kernel command string"
2369 command line at boot time, it is appended to this string to
2375 In most cases, the command line (whether built-in or provided
2380 bool "Built-in command line overrides boot loader arguments"
2384 command line, and use ONLY the built-in command line.
2393 Linux can allow user programs to install a per-process x86
2395 call. This is required to run 16-bit or segmented code such as
2400 context switches and increases the low-level kernel attack
2410 def_bool $(cc-option,-mharden-sls=all)
2413 def_bool $(cc-option,-mfunction-return=thunk-extern)
2443 kernel-to-user data leaks by avoiding speculative indirect
2444 branches. Requires a compiler with -mindirect-branch=thunk-extern
2448 bool "Enable return-thunks"
2452 Compile the kernel with the return-thunks compiler option to guard
2453 against kernel-to-user data leaks by avoiding return speculation.
2454 Requires a compiler with -mfunction-return=thunk-extern
2481 bool "Mitigate Straight-Line-Speculation"
2485 Compile the kernel with straight-line-speculation options to guard
2543 battery status information, and user-space programs will receive
2553 and more information, read <file:Documentation/power/apm-acpi.rst>
2554 and the Battery Powered Linux mini-HOWTO, available from
2559 VESA-compliant "green" monitors.
2577 2) pass the "no-hlt" option to the kernel
2611 feature is turned off -- see "Do CPU IDLE calls", below). This
2640 do with your VESA-compliant power-saving monitor. Further, this
2641 option doesn't work for all laptops -- it might not turn off your
2651 needs to. Unfortunately, some BIOSes do not -- especially those in
2676 PCI-based systems don't have any BIOS at all. Linux can also try to
2697 bool "OLPC XO-1"
2709 # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
2752 architectures -- if your target machine is modern, it probably does
2757 # x86_64 have no ISA slots, but can have ISA-style DMA.
2759 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2762 Enables ISA-style DMA support for devices requiring such controllers.
2781 PCI-IDs of several on-chip devices, so its a good dependency
2787 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
2791 This driver provides a clocksource built upon the on-chip
2792 27MHz high-resolution timer. Its also a workaround for
2793 NSC Geode SC-1100's buggy TSC, which loses time when the
2810 bool "OLPC XO-1 Power Management"
2813 Add support for poweroff and suspend of the OLPC XO-1 laptop.
2816 bool "OLPC XO-1 Real Time Clock"
2819 Add support for the XO-1 real time clock, which can be used as a
2823 bool "OLPC XO-1 SCI extras"
2828 Add support for SCI-based features of the OLPC XO-1 laptop:
2829 - EC-driven system wakeups
2830 - Power button
2831 - Ebook switch
2832 - Lid switch
2833 - AC adapter status updates
2834 - Battery status updates
2837 bool "OLPC XO-1.5 SCI extras"
2841 Add support for SCI-based features of the OLPC XO-1.5 laptop:
2842 - EC-driven system wakeups
2843 - AC adapter status updates
2844 - Battery status updates
2874 bool "Technologic Systems TS-5500 platform support"
2880 This option enables system support for the Technologic Systems TS-5500.
2892 bootloader or kernel can show basic video-output during boot for
2893 user-guidance and debugging. Historically, x86 used the VESA BIOS
2894 Extensions and EFI-framebuffers for this, which are mostly limited
2897 framebuffers so the new generic system-framebuffer drivers can be
2927 Include code to run legacy 32-bit programs under a
2928 64-bit kernel. You should likely turn this on, unless you're
2929 100% sure that you don't have any 32-bit programs left.
2939 bool "x32 ABI for 64-bit mode"
2942 Include code to run binaries for the x32 native 32-bit ABI
2943 for 64-bit processors. An x32 process gets access to the
2944 full 64-bit register file and wide data path while leaving