Lines Matching +full:broken +full:- +full:turn +full:- +full:around
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:
45 We keep the static function tracing (!DYNAMIC_FTRACE) around
48 only need to keep it around for x86_64. No need to keep it
54 # ported to 32-bit as well. )
140 # Word-size accesses may read uninitialized data past the trailing \0
314 default "elf32-i386" if X86_32
315 default "elf64-x86-64" if X86_64
413 …default $(success,$(srctree)/scripts/gcc-x86_64-has-stack-protector.sh $(CC) $(CLANG_FLAGS)) if 64…
414 default $(success,$(srctree)/scripts/gcc-x86_32-has-stack-protector.sh $(CC) $(CLANG_FLAGS))
417 the compiler produces broken code or if it does not let us control
418 the segment on 32-bit kernels.
423 bool "Symmetric multi-processing support"
429 If you say N here, the kernel will run on uni- and multiprocessor
444 See also <file:Documentation/arch/x86/i386/IO-APIC.rst>,
445 <file:Documentation/admin-guide/lockup-watchdogs.rst> and the SMP-HOWTO available at
456 This allows 32-bit apic IDs (so it can support very large systems),
507 bool "Support for extended (non-PC) x86 platforms"
515 for the following (non-PC) 32 bit x86 platforms:
518 RDC R-321x SoC
520 STA2X11-based (e.g. Northville)
524 generic distribution kernel, say Y here - otherwise say N.
529 bool "Support for extended (non-PC) x86 platforms"
537 for the following (non-PC) 64 bit x86 platforms:
543 generic distribution kernel, say Y here - otherwise say N.
556 Adds support for Numascale NumaChip large-SMP systems. Needed to
569 supposed to run on these EM64T-based machines. Only choose this option
680 - BayTrail
681 - Braswell
682 - Quark
700 bool "RDC R-321x SoC"
706 This option is needed for RDC R-321x system-on-chip, also known
707 as R-8610-(G).
711 bool "Support non-standard 32-bit SMP architectures"
726 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
727 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
738 This adds support for boards based on the STA2X11 IO-Hub,
759 prompt "Single-depth WCHAN output"
772 Say Y here to enable options for running Linux under various hyper-
794 bool "paravirt-ops debugging"
805 spinlock implementation with something virtualization-friendly
859 bool "Jailhouse non-root cell support"
863 This option allows to run Linux as guest in a Jailhouse non-root
873 a flexible, lightweight reference open-source hypervisor, built with
874 real-time and safety-criticality in mind. It is built for embedded
875 IOT with small footprint and real-time features. More details can be
879 bool "Intel TDX (Trust Domain Extensions) - Guest Support"
903 Use the IA-PC HPET (High Precision Event Timer) to manage
909 as it is off-chip. The interface used is documented
944 The GART supports full DMA access for devices with 32-bit access
953 32-bit limited device.
978 # The ranges are different on 32-bit and 64-bit kernels, depending on
1040 by sharing mid-level caches, last-level cache tags or internal
1048 prompt "Multi-core scheduler support"
1051 Multi-core scheduler support improves the CPU scheduler's decision
1052 making when dealing with multi-core CPU chips at a cost of slightly
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.
1116 bool "Reroute for broken boot IRQs"
1125 entry in the chipset's IO-APIC is masked (as, e.g. the RT
1135 Only affects "broken" chipsets. Interrupt sharing may be
1199 mode, which is an 80286-era approximation of 16-bit real mode.
1207 a 16-bit DOS program where 16-bit performance matters, vm86
1211 Note that any app that works on a 64-bit kernel is unlikely to
1212 need this option, as 64-bit kernels don't, and can't, support
1213 V8086 mode. This option is also unrelated to 16-bit protected
1214 mode and is not needed to run most 16-bit programs under Wine.
1226 bool "Enable support for 16-bit segments" if EXPERT
1230 This option is required by programs like Wine to run 16-bit
1232 this option saves about 300 bytes on i386, or around 6K text
1233 plus 16K runtime memory on x86-64,
1306 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
1328 tristate "/dev/cpu/*/msr - Model-specific register support"
1331 Model-Specific Registers (MSRs). It is a character device with
1333 MSR accesses are directed to a specific CPU on multi-processor
1337 tristate "/dev/cpu/*/cpuid - CPU information support"
1353 However, the address space of 32-bit x86 processors is only 4
1372 PAE implements 3-level paging on IA32 processors. PAE is fully
1388 Select this if you have a 32-bit processor and between 1 and 4
1396 Select this if you have a 32-bit processor and more than 4
1415 will also likely make your kernel incompatible with binary-only
1455 larger swapspace support for non-overcommit purposes. It
1460 bool "Enable 5-level page tables support"
1466 5-level paging enables access to larger address space:
1473 support 4- or 5-level paging.
1475 See Documentation/arch/x86/x86_64/5level-paging.rst for more
1538 Enable NUMA (Non-Uniform Memory Access) support.
1544 For 64-bit this is recommended if the system is Intel Core i7
1547 For 32-bit this is only needed if you boot a 32-bit
1548 kernel on a 64-bit NUMA platform.
1612 See Documentation/admin-guide/mm/memory-hotplug.rst for more information.
1628 tristate "Support non-standard NVDIMMs and ADR protected memory"
1635 Treat memory marked using the non-standard e820 type of 12 as used
1636 by the Intel Sandy Bridge-EP reference BIOS as protected memory.
1643 bool "Allocate 3rd-level pagetables from highmem"
1648 low memory. Setting this option will put user-space page table
1661 Documentation/admin-guide/kernel-parameters.rst to adjust this.
1669 BIOS-originated corruption always affects the same memory,
1697 is broken. Try "man bootparam" or see the documentation of your boot
1703 emulation can be found in <file:arch/x86/math-emu/README>.
1715 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1729 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1731 write-combining. All of these processors are supported by this code
1758 int "MTRR cleanup enable value (0-1)"
1766 int "MTRR cleanup spare reg num (0-7)"
1785 spontaneous reboots) or a non-working video driver.
1805 specific cases in protected and virtual-8086 modes. Emulated
1810 # Retpoline check to work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93654
1812 # https://github.com/llvm/llvm-project/commit/e0b89df2e0f0130881bf6c39bf31d7f6aac00e0f
1813 # https://github.com/llvm/llvm-project/commit/dfcf69770bc522b9e411c66454934a37c1f35332
1814 def_bool ((CC_IS_GCC && $(cc-option, -fcf-protection=branch -mindirect-branch-register)) || \
1816 $(as-instr,endbr64)
1827 # https://github.com/llvm/llvm-project/commit/9d7001eba9c4cb311e03cd8cdc231f9e579f2d0f
1833 hardware support course-grain forward-edge Control Flow Integrity
1848 # Note: only available in 64-bit mode
1854 page-based protections, but without requiring modification of the
1857 For details, see Documentation/core-api/protection-keys.rst
1881 and =auto. See Documentation/admin-guide/kernel-parameters.txt for more
1891 TSX is disabled if possible - equals to tsx=off command line parameter.
1896 TSX is always enabled on TSX capable HW - equals the tsx=on command
1903 side channel attacks- equals the tsx=auto command line parameter.
1957 resultant kernel should continue to boot on existing non-EFI
1968 See Documentation/admin-guide/efi-stub.rst for more information.
1988 bool "EFI mixed-mode support"
1991 Enabling this feature allows a 64-bit kernel to be booted
1992 on a 32-bit firmware, provided that your CPU supports 64-bit
1995 Note that it is not possible to boot a mixed-mode enabled
1996 kernel via the EFI boot stub - a bootloader that supports
2018 Ranges can be set up to this value using comma-separated list.
2025 Export EFI runtime memory regions to /sys/firmware/efi/runtime-map.
2029 See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map.
2092 command line boot parameter passed to the panic-ed
2093 kernel. Please take a look at Documentation/admin-guide/kdump/kdump.rst
2135 On 64-bit, the kernel physical and virtual addresses are
2142 On 32-bit, the kernel physical and virtual addresses are
2173 If bootloader loads the kernel at a non-aligned address and
2177 If bootloader loads the kernel at a non-aligned address and
2185 On 32-bit this value must be a multiple of 0x2000. On 64-bit
2234 to 64-bit linear addresses, allowing software to use of the
2246 prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)"
2250 presented with a 32-bit vDSO that is not mapped at the address
2260 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
2263 option from 1 to 0, which turns off the 32-bit vDSO entirely.
2264 This works around the glibc bug but hurts performance.
2298 certain uses of the vsyscall area as an ASLR-bypassing
2313 bool "Built-in kernel command line"
2325 Systems with fully functional boot loaders (i.e. non-embedded)
2329 string "Built-in kernel command string"
2341 In most cases, the command line (whether built-in or provided
2346 bool "Built-in command line overrides boot loader arguments"
2350 command line, and use ONLY the built-in command line.
2352 This is used to work around broken boot loaders. This should
2359 Linux can allow user programs to install a per-process x86
2361 call. This is required to run 16-bit or segmented code such as
2366 context switches and increases the low-level kernel attack
2392 def_bool $(cc-option,-mharden-sls=all)
2395 def_bool $(cc-option,-mfunction-return=thunk-extern)
2398 def_bool $(cc-option,-fpatchable-function-entry=16,16)
2408 # Basically: FUNCTION_ALIGNMENT - 5*CFI_CLANG
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-Speculation-Buffer (RSB) underflow issue. The
2499 non-affected systems the overhead of this option is marginal as
2500 the call depth tracking is using run-time generated call thunks
2515 kernel command line with 'debug-callthunks'.
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
2599 battery status information, and user-space programs will receive
2609 and more information, read <file:Documentation/power/apm-acpi.rst>
2610 and the Battery Powered Linux mini-HOWTO, available from
2614 manpage ("man 8 hdparm") for that), and it doesn't turn off
2615 VESA-compliant "green" monitors.
2667 feature is turned off -- see "Do CPU IDLE calls", below). This
2669 will be dependent on your BIOS implementation. You may need to turn
2671 support, or if it beeps continuously instead of suspending. Turn
2692 turn off the LCD backlight when the screen blanker of the Linux
2694 the virtual console screen blanker, and won't turn off the backlight
2696 do with your VESA-compliant power-saving monitor. Further, this
2697 option doesn't work for all laptops -- it might not turn off your
2707 needs to. Unfortunately, some BIOSes do not -- especially those in
2731 PCI-based systems don't have any BIOS at all. Linux can also try to
2752 bool "OLPC XO-1"
2764 # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
2806 architectures -- if your target machine is modern, it probably does
2811 # x86_64 have no ISA slots, but can have ISA-style DMA.
2813 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2816 Enables ISA-style DMA support for devices requiring such controllers.
2835 PCI-IDs of several on-chip devices, so its a good dependency
2841 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
2845 This driver provides a clocksource built upon the on-chip
2846 27MHz high-resolution timer. Its also a workaround for
2847 NSC Geode SC-1100's buggy TSC, which loses time when the
2864 bool "OLPC XO-1 Power Management"
2867 Add support for poweroff and suspend of the OLPC XO-1 laptop.
2870 bool "OLPC XO-1 Real Time Clock"
2873 Add support for the XO-1 real time clock, which can be used as a
2877 bool "OLPC XO-1 SCI extras"
2882 Add support for SCI-based features of the OLPC XO-1 laptop:
2883 - EC-driven system wakeups
2884 - Power button
2885 - Ebook switch
2886 - Lid switch
2887 - AC adapter status updates
2888 - Battery status updates
2891 bool "OLPC XO-1.5 SCI extras"
2895 Add support for SCI-based features of the OLPC XO-1.5 laptop:
2896 - EC-driven system wakeups
2897 - AC adapter status updates
2898 - Battery status updates
2928 bool "Technologic Systems TS-5500 platform support"
2934 This option enables system support for the Technologic Systems TS-5500.
2953 Include code to run legacy 32-bit programs under a
2954 64-bit kernel. You should likely turn this on, unless you're
2955 100% sure that you don't have any 32-bit programs left.
2958 bool "x32 ABI for 64-bit mode"
2960 # llvm-objcopy does not convert x86_64 .note.gnu.property or
2964 depends on $(success,$(OBJCOPY) --version | head -n1 | grep -qv llvm)
2966 Include code to run binaries for the x32 native 32-bit ABI
2967 for 64-bit processors. An x32 process gets access to the
2968 full 64-bit register file and wide data path while leaving