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Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 59 |
1 files changed, 57 insertions, 2 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index d10183163adf..e47f2c950855 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1463,6 +1463,41 @@ bytes respectively. Such letter suffixes can also be entirely omitted. In such case C2/C3 won't be used again. idle=nomwait: Disable mwait for CPU C-states + ieee754= [MIPS] Select IEEE Std 754 conformance mode + Format: { strict | legacy | 2008 | relaxed } + Default: strict + + Choose which programs will be accepted for execution + based on the IEEE 754 NaN encoding(s) supported by + the FPU and the NaN encoding requested with the value + of an ELF file header flag individually set by each + binary. Hardware implementations are permitted to + support either or both of the legacy and the 2008 NaN + encoding mode. + + Available settings are as follows: + strict accept binaries that request a NaN encoding + supported by the FPU + legacy only accept legacy-NaN binaries, if supported + by the FPU + 2008 only accept 2008-NaN binaries, if supported + by the FPU + relaxed accept any binaries regardless of whether + supported by the FPU + + The FPU emulator is always able to support both NaN + encodings, so if no FPU hardware is present or it has + been disabled with 'nofpu', then the settings of + 'legacy' and '2008' strap the emulator accordingly, + 'relaxed' straps the emulator for both legacy-NaN and + 2008-NaN, whereas 'strict' enables legacy-NaN only on + legacy processors and both NaN encodings on MIPS32 or + MIPS64 CPUs. + + The setting for ABS.fmt/NEG.fmt instruction execution + mode generally follows that for the NaN encoding, + except where unsupported by hardware. + ignore_loglevel [KNL] Ignore loglevel setting - this will print /all/ kernel messages to the console. Useful for debugging. @@ -2418,6 +2453,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted. noalign [KNL,ARM] + noaltinstr [S390] Disables alternative instructions patching + (CPU alternatives feature). + noapic [SMP,APIC] Tells the kernel to not make use of any IOAPICs that may be present in the system. @@ -2445,6 +2483,25 @@ bytes respectively. Such letter suffixes can also be entirely omitted. noexec=on: enable non-executable mappings (default) noexec=off: disable non-executable mappings + noexec [MIPS] + Force indicating stack and heap as non-executable or + executable regardless of PT_GNU_STACK entry or CPU XI + (execute inhibit) support. Valid valuess are: on, off. + noexec=on: force indicating non-executable + stack and heap + noexec=off: force indicating executable + stack and heap + If this parameter is omitted, stack and heap will be + indicated non-executable or executable as they are + actually set up, which depends on PT_GNU_STACK entry + and possibly other factors (for instance, CPU XI + support). + NOTE: Using noexec=on on a system without CPU XI + support is not recommended since there is no actual + HW support that provide non-executable stack/heap. + Use only for debugging purposes and not in a + production environment. + nosmap [X86] Disable SMAP (Supervisor Mode Access Prevention) even if it is supported by processor. @@ -2581,8 +2638,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted. norandmaps Don't use address space randomization. Equivalent to echo 0 > /proc/sys/kernel/randomize_va_space - noreplace-paravirt [X86,IA-64,PV_OPS] Don't patch paravirt_ops - noreplace-smp [X86-32,SMP] Don't replace SMP instructions with UP alternatives |