Lines Matching +full:boot +full:- +full:time
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:
56 # ported to 32-bit as well. )
158 # Word-size accesses may read uninitialized data past the trailing \0
342 default "elf32-i386" if X86_32
343 default "elf64-x86-64" if X86_64
433 bool "Symmetric multi-processing support"
439 If you say N here, the kernel will run on uni- and multiprocessor
451 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
454 See also <file:Documentation/arch/x86/i386/IO-APIC.rst>,
455 <file:Documentation/admin-guide/lockup-watchdogs.rst> and the SMP-HOWTO available at
476 If this configuration option is disabled, the kernel will boot with
491 APIC accesses and support for managing guest owned APIC state for SEV-SNP
498 bool "Enable MSI and MSI-x delivery by posted interrupts"
549 bool "Support for extended (non-PC) x86 platforms"
557 for the following non-PC x86 platforms, depending on the value of
560 32-bit platforms (CONFIG_64BIT=n):
564 RDC R-321x SoC
566 64-bit platforms (CONFIG_64BIT=y):
574 generic distribution kernel, say Y here - otherwise say N.
587 Adds support for Numascale NumaChip large-SMP systems. Needed to
600 supposed to run on these EM64T-based machines. Only choose this option
627 Select to build a kernel capable of supporting 64-bit Intel MID
636 If you are building for a PC class system or non-MID tablet
686 bool "RDC R-321x SoC"
692 This option is needed for RDC R-321x system-on-chip, also known
693 as R-8610-(G).
730 - BayTrail
731 - Braswell
732 - Quark
753 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
754 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
773 prompt "Single-depth WCHAN output"
786 Say Y here to enable options for running Linux under various hyper-
809 bool "paravirt-ops debugging"
820 spinlock implementation with something virtualization-friendly
845 timing infrastructure such as time of day, and system time
857 as specified in the x86/HVM direct boot ABI.
860 bool "Paravirtual steal time accounting"
863 Select this option to enable fine granularity task steal time
864 accounting. Time spent executing other tasks in parallel with
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
903 bool "Intel TDX (Trust Domain Extensions) - Guest Support"
914 the guest kernel can not boot or run under TDX.
928 Use the IA-PC HPET (High Precision Event Timer) to manage
929 time in preference to the PIT and RTC, if a HPET is
932 The HPET provides a stable time base on SMP
934 as it is off-chip. The interface used is documented
968 The GART supports full DMA access for devices with 32-bit access
977 32-bit limited device.
985 of VESA video modes set at an early boot stage via the vga= parameter.
1002 # The ranges are different on 32-bit and 64-bit kernels, depending on
1063 core ordering determined at manufacturing time, which allows
1086 integrated interrupt controller in the CPU. If you have a single-CPU
1090 all. The local APIC supports CPU-generated self-interrupts (timer,
1095 bool "IO-APIC support on uniprocessors"
1098 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
1099 SMP-capable replacement for PC-style interrupt controllers. Most
1102 If you have a single-CPU system with an IO-APIC, you can say Y here
1104 an IO-APIC, then the kernel will still run with no slowdown at all.
1123 bool "Reroute for broken boot IRQs"
1129 superfluous "boot interrupts" cannot be disabled.
1131 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
1132 entry in the chipset's IO-APIC is masked (as, e.g. the RT
1134 boot IRQ generation cannot be disabled, this workaround keeps
1135 the original IRQ line masked so that only the equivalent "boot
1137 kernel to set up the IRQ handler on the boot IRQ line. In this
1206 mode, which is an 80286-era approximation of 16-bit real mode.
1214 a 16-bit DOS program where 16-bit performance matters, vm86
1218 Note that any app that works on a 64-bit kernel is unlikely to
1219 need this option, as 64-bit kernels don't, and can't, support
1220 V8086 mode. This option is also unrelated to 16-bit protected
1221 mode and is not needed to run most 16-bit programs under Wine.
1233 bool "Enable support for 16-bit segments" if EXPERT
1237 This option is required by programs like Wine to run 16-bit
1240 plus 16K runtime memory on x86-64,
1313 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
1373 tristate "/dev/cpu/*/msr - Model-specific register support"
1376 Model-Specific Registers (MSRs). It is a character device with
1378 MSR accesses are directed to a specific CPU on multi-processor
1382 tristate "/dev/cpu/*/cpuid - CPU information support"
1394 However, the address space of 32-bit x86 processors is only 4
1427 will also likely make your kernel incompatible with binary-only
1465 larger swapspace support for non-overcommit purposes. It
1515 Enable NUMA (Non-Uniform Memory Access) support.
1521 For 64-bit this is recommended if the system is Intel Core i7
1577 See Documentation/admin-guide/mm/memory-hotplug.rst for more information.
1593 tristate "Support non-standard NVDIMMs and ADR protected memory"
1600 Treat memory marked using the non-standard e820 type of 12 as used
1601 by the Intel Sandy Bridge-EP reference BIOS as protected memory.
1617 Documentation/admin-guide/kernel-parameters.rst to adjust this.
1625 BIOS-originated corruption always affects the same memory,
1645 a 487DX or 387, respectively. (The messages during boot time can
1653 is broken. Try "man bootparam" or see the documentation of your boot
1655 boot time.) This means that it is a good idea to say Y here if you
1659 emulation can be found in <file:arch/x86/math-emu/README>.
1671 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1685 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1687 write-combining. All of these processors are supported by this code
1691 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1714 int "MTRR cleanup enable value (0-1)"
1722 int "MTRR cleanup spare reg num (0-7)"
1741 Say N here if you see bootup problems (boot crash, boot hang,
1742 spontaneous reboots) or a non-working video driver.
1758 specific cases in protected and virtual-8086 modes. Emulated
1764 …def_bool ((CC_IS_GCC && $(cc-option, -fcf-protection=branch -mindirect-branch-register)) || CC_IS_…
1765 $(as-instr,endbr64)
1780 hardware support course-grain forward-edge Control Flow Integrity
1795 # Note: only available in 64-bit mode
1801 page-based protections, but without requiring modification of the
1804 For details, see Documentation/core-api/protection-keys.rst
1832 and =auto. See Documentation/admin-guide/kernel-parameters.txt for more
1842 TSX is disabled if possible - equals to tsx=off command line parameter.
1847 TSX is always enabled on TSX capable HW - equals the tsx=on command
1854 side channel attacks- equals the tsx=auto command line parameter.
1924 resultant kernel should continue to boot on existing non-EFI
1935 See Documentation/admin-guide/efi-stub.rst for more information.
1955 bool "EFI mixed-mode support"
1958 Enabling this feature allows a 64-bit kernel to be booted
1959 on a 32-bit firmware, provided that your CPU supports 64-bit
1962 Note that it is not possible to boot a mixed-mode enabled
1963 kernel via the EFI boot stub - a bootloader that supports
1972 Export EFI runtime memory regions to /sys/firmware/efi/runtime-map.
1976 See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map.
2030 by the boot loader. The only exception is if it is loaded below the
2048 command line boot parameter passed to the panic-ed
2049 kernel. Please take a look at Documentation/admin-guide/kdump/kdump.rst
2076 it has been loaded at and the compile time physical address
2091 On 64-bit, the kernel physical and virtual addresses are
2098 On 32-bit, the kernel physical and virtual addresses are
2130 If bootloader loads the kernel at a non-aligned address and
2134 If bootloader loads the kernel at a non-aligned address and
2135 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
2142 On 32-bit this value must be a multiple of 0x2000. On 64-bit
2185 to 64-bit linear addresses, allowing software to use of the
2201 presented with a 32-bit vDSO that is not mapped at the address
2211 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
2213 Saying Y here changes the default value of the vdso32 boot
2214 option from 1 to 0, which turns off the 32-bit vDSO entirely.
2230 This setting can be changed at boot time via the kernel command
2249 certain uses of the vsyscall area as an ASLR-bypassing
2264 bool "Built-in kernel command line"
2266 Allow for specifying boot arguments to the kernel at
2267 build time. On some systems (e.g. embedded ones), it is
2269 kernel boot arguments with the kernel itself (that is,
2270 to not rely on the boot loader to provide them.)
2274 boot arguments in CONFIG_CMDLINE.
2276 Systems with fully functional boot loaders (i.e. non-embedded)
2280 string "Built-in kernel command string"
2285 image and used at boot time. If the boot loader provides a
2286 command line at boot time, it is appended to this string to
2292 In most cases, the command line (whether built-in or provided
2293 by the boot loader) should specify the device for the root
2297 bool "Built-in command line overrides boot loader arguments"
2300 Set this option to 'Y' to have the kernel ignore the boot loader
2301 command line, and use ONLY the built-in command line.
2303 This is used to work around broken boot loaders. This should
2310 Linux can allow user programs to install a per-process x86
2312 call. This is required to run 16-bit or segmented code such as
2317 context switches and increases the low-level kernel attack
2339 bool "Attempt to use FineIBT by default at boot time"
2344 Attempt to use FineIBT by default at boot time. If enabled,
2361 def_bool $(success,echo 'int __seg_fs fs; int __seg_gs gs;' | $(CC) -x c - -S -o /dev/null)
2365 # -fsanitize=kernel-address (KASAN) and -fsanitize=thread (KCSAN)
2380 def_bool $(cc-option,-mharden-sls=all)
2383 def_bool $(cc-option,-mfunction-return=thunk-extern)
2386 def_bool $(cc-option,-fpatchable-function-entry=16,16)
2389 def_bool $(cc-option,-fsanitize=kcfi -fsanitize-kcfi-arity)
2400 # Basically: FUNCTION_ALIGNMENT - 5*CFI
2466 kernel-to-user data leaks by avoiding speculative indirect
2467 branches. Requires a compiler with -mindirect-branch=thunk-extern
2471 bool "Enable return-thunks"
2476 Compile the kernel with the return-thunks compiler option to guard
2477 against kernel-to-user data leaks by avoiding return speculation.
2478 Requires a compiler with -mfunction-return=thunk-extern
2496 SKL Return-Stack-Buffer (RSB) underflow issue. The mitigation is off
2498 retbleed=stuff option. For non-affected systems the overhead of this
2499 option is marginal as the call depth tracking is using run-time
2514 kernel command line with 'debug-callthunks'.
2524 spec_rstack_overflow={ibpb,ibpb-vmexit} mitigations.
2540 Enable the SRSO mitigation needed on AMD Zen1-4 machines.
2543 bool "Mitigate Straight-Line-Speculation"
2548 Compile the kernel with straight-line-speculation options to guard
2571 See also <file:Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst>
2574 bool "Mitigate Spectre-BHB (Branch History Injection)"
2581 See <file:Documentation/admin-guide/hw-vuln/spectre.rst>
2591 See also <file:Documentation/admin-guide/hw-vuln/mds.rst>
2602 See also <file:Documentation/admin-guide/hw-vuln/tsx_async_abort.rst>
2610 Stale Data Vulnerabilities are a class of memory-mapped I/O (MMIO)
2614 <file:Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst>
2624 See <file:Documentation/admin-guide/hw-vuln/l1tf.rst
2647 See also <file:Documentation/admin-guide/hw-vuln/spectre.rst>
2659 See also <file:Documentation/admin-guide/hw-vuln/spectre.rst>
2673 <file:Documentation/admin-guide/hw-vuln/special-register-buffer-data-sampling.rst>
2694 See <file:Documentation/admin-guide/hw-vuln/indirect-target-selection.rst>
2740 APM compliant BIOSes. If you say Y here, the system time will be
2742 battery status information, and user-space programs will receive
2746 BIOS by passing the "apm=off" option to the kernel at boot time.
2752 and more information, read <file:Documentation/power/apm-acpi.rst>
2753 and the Battery Powered Linux mini-HOWTO, available from
2758 VESA-compliant "green" monitors.
2763 may cause those machines to panic during the boot phase.
2803 bool "Enable PM at boot time"
2805 Enable APM features at boot time. From page 36 of the APM BIOS
2810 feature is turned off -- see "Do CPU IDLE calls", below). This
2813 this option off if your computer hangs at boot time when using APM
2826 are made after the idle loop has run for some length of time (e.g.,
2827 333 mS). On some machines, this will cause a hang at boot time or
2839 do with your VESA-compliant power-saving monitor. Further, this
2840 option doesn't work for all laptops -- it might not turn off your
2850 needs to. Unfortunately, some BIOSes do not -- especially those in
2874 PCI-based systems don't have any BIOS at all. Linux can also try to
2895 bool "OLPC XO-1"
2907 # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
2956 lspci -nn | grep '1166:0009'
2970 architectures -- if your target machine is modern, it probably does
2975 # x86_64 have no ISA slots, but can have ISA-style DMA.
2977 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2980 Enables ISA-style DMA support for devices requiring such controllers.
2999 PCI-IDs of several on-chip devices, so its a good dependency
3005 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
3009 This driver provides a clocksource built upon the on-chip
3010 27MHz high-resolution timer. Its also a workaround for
3011 NSC Geode SC-1100's buggy TSC, which loses time when the
3013 other workaround is idle=poll boot option.
3028 bool "OLPC XO-1 Power Management"
3031 Add support for poweroff and suspend of the OLPC XO-1 laptop.
3034 bool "OLPC XO-1 Real Time Clock"
3037 Add support for the XO-1 real time clock, which can be used as a
3041 bool "OLPC XO-1 SCI extras"
3046 Add support for SCI-based features of the OLPC XO-1 laptop:
3047 - EC-driven system wakeups
3048 - Power button
3049 - Ebook switch
3050 - Lid switch
3051 - AC adapter status updates
3052 - Battery status updates
3055 bool "OLPC XO-1.5 SCI extras"
3059 Add support for SCI-based features of the OLPC XO-1.5 laptop:
3060 - EC-driven system wakeups
3061 - AC adapter status updates
3062 - Battery status updates
3098 bool "Technologic Systems TS-5500 platform support"
3104 This option enables system support for the Technologic Systems TS-5500.
3127 Include code to run legacy 32-bit programs under a
3128 64-bit kernel. You should likely turn this on, unless you're
3129 100% sure that you don't have any 32-bit programs left.
3136 Make IA32 emulation disabled by default. This prevents loading 32-bit
3137 processes and access to 32-bit syscalls. If unsure, leave it to its
3141 bool "x32 ABI for 64-bit mode"
3143 # llvm-objcopy does not convert x86_64 .note.gnu.property or
3147 depends on $(success,$(OBJCOPY) --version | head -n1 | grep -qv llvm)
3149 Include code to run binaries for the x32 native 32-bit ABI
3150 for 64-bit processors. An x32 process gets access to the
3151 full 64-bit register file and wide data path while leaving