[PATCH] uml: reuse i386 cpu-specific tuning
Make UML share the underlying cpu-specific tuning done on i386.
Actually, for now many config options aren't used a lot - but that can be done
later. Also, UML relies on GCC optimization for things like memcpy and such
more than i386, so specifying the correct -march and -mtune should be enough.
Later, we may want to correct some other stuff.
For instance, since FPU context switching, for us, is done (at least
partially, i.e. between our kernelspace and userspace) by the host, we may
allow usage of FPU operations by GCC. This doesn't hold for kernelspace vs.
kernelspace, but we don't support preemption.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 18:00:07 -05:00
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# Put here option for CPU selection and depending optimization
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if !X86_ELAN
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choice
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prompt "Processor family"
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default M686
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config M386
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bool "386"
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2006-10-11 04:21:35 -04:00
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depends on !UML
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[PATCH] uml: reuse i386 cpu-specific tuning
Make UML share the underlying cpu-specific tuning done on i386.
Actually, for now many config options aren't used a lot - but that can be done
later. Also, UML relies on GCC optimization for things like memcpy and such
more than i386, so specifying the correct -march and -mtune should be enough.
Later, we may want to correct some other stuff.
For instance, since FPU context switching, for us, is done (at least
partially, i.e. between our kernelspace and userspace) by the host, we may
allow usage of FPU operations by GCC. This doesn't hold for kernelspace vs.
kernelspace, but we don't support preemption.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 18:00:07 -05:00
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---help---
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This is the processor type of your CPU. This information is used for
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optimizing purposes. In order to compile a kernel that can run on
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all x86 CPU types (albeit not optimally fast), you can specify
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"386" here.
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The kernel will not necessarily run on earlier architectures than
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the one you have chosen, e.g. a Pentium optimized kernel will run on
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a PPro, but not necessarily on a i486.
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Here are the settings recommended for greatest speed:
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- "386" for the AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI
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486DLC/DLC2, UMC 486SX-S and NexGen Nx586. Only "386" kernels
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will run on a 386 class machine.
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- "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
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SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
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- "586" for generic Pentium CPUs lacking the TSC
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(time stamp counter) register.
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- "Pentium-Classic" for the Intel Pentium.
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- "Pentium-MMX" for the Intel Pentium MMX.
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- "Pentium-Pro" for the Intel Pentium Pro.
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- "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.
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- "Pentium-III" for the Intel Pentium III or Coppermine Celeron.
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- "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.
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- "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).
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- "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
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- "Crusoe" for the Transmeta Crusoe series.
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- "Efficeon" for the Transmeta Efficeon series.
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- "Winchip-C6" for original IDT Winchip.
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- "Winchip-2" for IDT Winchip 2.
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- "Winchip-2A" for IDT Winchips with 3dNow! capabilities.
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- "GeodeGX1" for Geode GX1 (Cyrix MediaGX).
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2006-01-06 03:12:14 -05:00
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- "Geode GX/LX" For AMD Geode GX and LX processors.
|
[PATCH] uml: reuse i386 cpu-specific tuning
Make UML share the underlying cpu-specific tuning done on i386.
Actually, for now many config options aren't used a lot - but that can be done
later. Also, UML relies on GCC optimization for things like memcpy and such
more than i386, so specifying the correct -march and -mtune should be enough.
Later, we may want to correct some other stuff.
For instance, since FPU context switching, for us, is done (at least
partially, i.e. between our kernelspace and userspace) by the host, we may
allow usage of FPU operations by GCC. This doesn't hold for kernelspace vs.
kernelspace, but we don't support preemption.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 18:00:07 -05:00
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- "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
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2006-06-26 12:47:15 -04:00
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- "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above).
|
[PATCH] uml: reuse i386 cpu-specific tuning
Make UML share the underlying cpu-specific tuning done on i386.
Actually, for now many config options aren't used a lot - but that can be done
later. Also, UML relies on GCC optimization for things like memcpy and such
more than i386, so specifying the correct -march and -mtune should be enough.
Later, we may want to correct some other stuff.
For instance, since FPU context switching, for us, is done (at least
partially, i.e. between our kernelspace and userspace) by the host, we may
allow usage of FPU operations by GCC. This doesn't hold for kernelspace vs.
kernelspace, but we don't support preemption.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 18:00:07 -05:00
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If you don't know what to do, choose "386".
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config M486
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bool "486"
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help
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Select this for a 486 series processor, either Intel or one of the
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compatible processors from AMD, Cyrix, IBM, or Intel. Includes DX,
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DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or
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U5S.
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config M586
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bool "586/K5/5x86/6x86/6x86MX"
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help
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Select this for an 586 or 686 series processor such as the AMD K5,
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the Cyrix 5x86, 6x86 and 6x86MX. This choice does not
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assume the RDTSC (Read Time Stamp Counter) instruction.
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config M586TSC
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bool "Pentium-Classic"
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help
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Select this for a Pentium Classic processor with the RDTSC (Read
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Time Stamp Counter) instruction for benchmarking.
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config M586MMX
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bool "Pentium-MMX"
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help
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Select this for a Pentium with the MMX graphics/multimedia
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extended instructions.
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config M686
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bool "Pentium-Pro"
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help
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Select this for Intel Pentium Pro chips. This enables the use of
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Pentium Pro extended instructions, and disables the init-time guard
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against the f00f bug found in earlier Pentiums.
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config MPENTIUMII
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bool "Pentium-II/Celeron(pre-Coppermine)"
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help
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Select this for Intel chips based on the Pentium-II and
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pre-Coppermine Celeron core. This option enables an unaligned
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copy optimization, compiles the kernel with optimization flags
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tailored for the chip, and applies any applicable Pentium Pro
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optimizations.
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config MPENTIUMIII
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bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
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help
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Select this for Intel chips based on the Pentium-III and
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Celeron-Coppermine core. This option enables use of some
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extended prefetch instructions in addition to the Pentium II
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extensions.
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config MPENTIUMM
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bool "Pentium M"
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help
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Select this for Intel Pentium M (not Pentium-4 M)
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notebook chips.
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2006-12-06 20:14:09 -05:00
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config MCORE2
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bool "Core 2/newer Xeon"
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help
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Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and 53xx)
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CPUs. You can distingush newer from older Xeons by the CPU family
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in /proc/cpuinfo. Newer ones have 6.
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[PATCH] uml: reuse i386 cpu-specific tuning
Make UML share the underlying cpu-specific tuning done on i386.
Actually, for now many config options aren't used a lot - but that can be done
later. Also, UML relies on GCC optimization for things like memcpy and such
more than i386, so specifying the correct -march and -mtune should be enough.
Later, we may want to correct some other stuff.
For instance, since FPU context switching, for us, is done (at least
partially, i.e. between our kernelspace and userspace) by the host, we may
allow usage of FPU operations by GCC. This doesn't hold for kernelspace vs.
kernelspace, but we don't support preemption.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 18:00:07 -05:00
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config MPENTIUM4
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2006-12-06 20:14:09 -05:00
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bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"
|
[PATCH] uml: reuse i386 cpu-specific tuning
Make UML share the underlying cpu-specific tuning done on i386.
Actually, for now many config options aren't used a lot - but that can be done
later. Also, UML relies on GCC optimization for things like memcpy and such
more than i386, so specifying the correct -march and -mtune should be enough.
Later, we may want to correct some other stuff.
For instance, since FPU context switching, for us, is done (at least
partially, i.e. between our kernelspace and userspace) by the host, we may
allow usage of FPU operations by GCC. This doesn't hold for kernelspace vs.
kernelspace, but we don't support preemption.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 18:00:07 -05:00
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help
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Select this for Intel Pentium 4 chips. This includes the
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Pentium 4, P4-based Celeron and Xeon, and Pentium-4 M
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(not Pentium M) chips. This option enables compile flags
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optimized for the chip, uses the correct cache shift, and
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applies any applicable Pentium III optimizations.
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config MK6
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bool "K6/K6-II/K6-III"
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help
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Select this for an AMD K6-family processor. Enables use of
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some extended instructions, and passes appropriate optimization
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flags to GCC.
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config MK7
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bool "Athlon/Duron/K7"
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help
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Select this for an AMD Athlon K7-family processor. Enables use of
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some extended instructions, and passes appropriate optimization
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flags to GCC.
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config MK8
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bool "Opteron/Athlon64/Hammer/K8"
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help
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Select this for an AMD Opteron or Athlon64 Hammer-family processor. Enables
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use of some extended instructions, and passes appropriate optimization
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flags to GCC.
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config MCRUSOE
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bool "Crusoe"
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help
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Select this for a Transmeta Crusoe processor. Treats the processor
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like a 586 with TSC, and sets some GCC optimization flags (like a
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Pentium Pro with no alignment requirements).
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config MEFFICEON
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bool "Efficeon"
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help
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Select this for a Transmeta Efficeon processor.
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config MWINCHIPC6
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bool "Winchip-C6"
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help
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Select this for an IDT Winchip C6 chip. Linux and GCC
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treat this chip as a 586TSC with some extended instructions
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and alignment requirements.
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config MWINCHIP2
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bool "Winchip-2"
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help
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Select this for an IDT Winchip-2. Linux and GCC
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treat this chip as a 586TSC with some extended instructions
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and alignment requirements.
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config MWINCHIP3D
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bool "Winchip-2A/Winchip-3"
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help
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Select this for an IDT Winchip-2A or 3. Linux and GCC
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treat this chip as a 586TSC with some extended instructions
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and alignment reqirements. Also enable out of order memory
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stores for this CPU, which can increase performance of some
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operations.
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config MGEODEGX1
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bool "GeodeGX1"
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help
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Select this for a Geode GX1 (Cyrix MediaGX) chip.
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2006-01-06 03:12:14 -05:00
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config MGEODE_LX
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bool "Geode GX/LX"
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help
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Select this for AMD Geode GX and LX processors.
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|
[PATCH] uml: reuse i386 cpu-specific tuning
Make UML share the underlying cpu-specific tuning done on i386.
Actually, for now many config options aren't used a lot - but that can be done
later. Also, UML relies on GCC optimization for things like memcpy and such
more than i386, so specifying the correct -march and -mtune should be enough.
Later, we may want to correct some other stuff.
For instance, since FPU context switching, for us, is done (at least
partially, i.e. between our kernelspace and userspace) by the host, we may
allow usage of FPU operations by GCC. This doesn't hold for kernelspace vs.
kernelspace, but we don't support preemption.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 18:00:07 -05:00
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config MCYRIXIII
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bool "CyrixIII/VIA-C3"
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help
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Select this for a Cyrix III or C3 chip. Presently Linux and GCC
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treat this chip as a generic 586. Whilst the CPU is 686 class,
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it lacks the cmov extension which gcc assumes is present when
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generating 686 code.
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Note that Nehemiah (Model 9) and above will not boot with this
|
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kernel due to them lacking the 3DNow! instructions used in earlier
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incarnations of the CPU.
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config MVIAC3_2
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bool "VIA C3-2 (Nehemiah)"
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help
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Select this for a VIA C3 "Nehemiah". Selecting this enables usage
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of SSE and tells gcc to treat the CPU as a 686.
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Note, this kernel will not boot on older (pre model 9) C3s.
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endchoice
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config X86_GENERIC
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bool "Generic x86 support"
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help
|
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Instead of just including optimizations for the selected
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|
x86 variant (e.g. PII, Crusoe or Athlon), include some more
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generic optimizations as well. This will make the kernel
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perform better on x86 CPUs other than that selected.
|
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|
This is really intended for distributors who need more
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generic optimizations.
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endif
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#
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# Define implied options from the CPU selection here
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#
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config X86_CMPXCHG
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bool
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depends on !M386
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default y
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config X86_XADD
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bool
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depends on !M386
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default y
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config X86_L1_CACHE_SHIFT
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int
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default "7" if MPENTIUM4 || X86_GENERIC
|
2006-01-06 03:12:14 -05:00
|
|
|
default "4" if X86_ELAN || M486 || M386 || MGEODEGX1
|
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|
default "5" if MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
|
2006-12-06 20:14:09 -05:00
|
|
|
default "6" if MK7 || MK8 || MPENTIUMM || MCORE2
|
[PATCH] uml: reuse i386 cpu-specific tuning
Make UML share the underlying cpu-specific tuning done on i386.
Actually, for now many config options aren't used a lot - but that can be done
later. Also, UML relies on GCC optimization for things like memcpy and such
more than i386, so specifying the correct -march and -mtune should be enough.
Later, we may want to correct some other stuff.
For instance, since FPU context switching, for us, is done (at least
partially, i.e. between our kernelspace and userspace) by the host, we may
allow usage of FPU operations by GCC. This doesn't hold for kernelspace vs.
kernelspace, but we don't support preemption.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 18:00:07 -05:00
|
|
|
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|
|
|
|
config RWSEM_GENERIC_SPINLOCK
|
|
|
|
|
bool
|
|
|
|
|
depends on M386
|
|
|
|
|
default y
|
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|
|
|
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|
|
|
config RWSEM_XCHGADD_ALGORITHM
|
|
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|
|
bool
|
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|
|
depends on !M386
|
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|
|
|
default y
|
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|
|
|
|
2006-12-08 05:37:49 -05:00
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|
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config ARCH_HAS_ILOG2_U32
|
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|
|
|
bool
|
|
|
|
|
default n
|
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|
|
|
|
|
|
|
|
config ARCH_HAS_ILOG2_U64
|
|
|
|
|
bool
|
|
|
|
|
default n
|
|
|
|
|
|
[PATCH] uml: reuse i386 cpu-specific tuning
Make UML share the underlying cpu-specific tuning done on i386.
Actually, for now many config options aren't used a lot - but that can be done
later. Also, UML relies on GCC optimization for things like memcpy and such
more than i386, so specifying the correct -march and -mtune should be enough.
Later, we may want to correct some other stuff.
For instance, since FPU context switching, for us, is done (at least
partially, i.e. between our kernelspace and userspace) by the host, we may
allow usage of FPU operations by GCC. This doesn't hold for kernelspace vs.
kernelspace, but we don't support preemption.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 18:00:07 -05:00
|
|
|
config GENERIC_CALIBRATE_DELAY
|
|
|
|
|
bool
|
|
|
|
|
default y
|
|
|
|
|
|
|
|
|
|
config X86_PPRO_FENCE
|
|
|
|
|
bool
|
|
|
|
|
depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1
|
|
|
|
|
default y
|
|
|
|
|
|
|
|
|
|
config X86_F00F_BUG
|
|
|
|
|
bool
|
|
|
|
|
depends on M586MMX || M586TSC || M586 || M486 || M386
|
|
|
|
|
default y
|
|
|
|
|
|
|
|
|
|
config X86_WP_WORKS_OK
|
|
|
|
|
bool
|
|
|
|
|
depends on !M386
|
|
|
|
|
default y
|
|
|
|
|
|
|
|
|
|
config X86_INVLPG
|
|
|
|
|
bool
|
|
|
|
|
depends on !M386
|
|
|
|
|
default y
|
|
|
|
|
|
|
|
|
|
config X86_BSWAP
|
|
|
|
|
bool
|
|
|
|
|
depends on !M386
|
|
|
|
|
default y
|
|
|
|
|
|
|
|
|
|
config X86_POPAD_OK
|
|
|
|
|
bool
|
|
|
|
|
depends on !M386
|
|
|
|
|
default y
|
|
|
|
|
|
|
|
|
|
config X86_CMPXCHG64
|
|
|
|
|
bool
|
|
|
|
|
depends on !M386 && !M486
|
|
|
|
|
default y
|
|
|
|
|
|
|
|
|
|
config X86_ALIGNMENT_16
|
|
|
|
|
bool
|
|
|
|
|
depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
|
|
|
|
|
default y
|
|
|
|
|
|
|
|
|
|
config X86_GOOD_APIC
|
|
|
|
|
bool
|
2006-12-06 20:14:09 -05:00
|
|
|
depends on MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || MK8 || MEFFICEON || MCORE2
|
[PATCH] uml: reuse i386 cpu-specific tuning
Make UML share the underlying cpu-specific tuning done on i386.
Actually, for now many config options aren't used a lot - but that can be done
later. Also, UML relies on GCC optimization for things like memcpy and such
more than i386, so specifying the correct -march and -mtune should be enough.
Later, we may want to correct some other stuff.
For instance, since FPU context switching, for us, is done (at least
partially, i.e. between our kernelspace and userspace) by the host, we may
allow usage of FPU operations by GCC. This doesn't hold for kernelspace vs.
kernelspace, but we don't support preemption.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 18:00:07 -05:00
|
|
|
default y
|
|
|
|
|
|
|
|
|
|
config X86_INTEL_USERCOPY
|
|
|
|
|
bool
|
2006-12-06 20:14:09 -05:00
|
|
|
depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
|
[PATCH] uml: reuse i386 cpu-specific tuning
Make UML share the underlying cpu-specific tuning done on i386.
Actually, for now many config options aren't used a lot - but that can be done
later. Also, UML relies on GCC optimization for things like memcpy and such
more than i386, so specifying the correct -march and -mtune should be enough.
Later, we may want to correct some other stuff.
For instance, since FPU context switching, for us, is done (at least
partially, i.e. between our kernelspace and userspace) by the host, we may
allow usage of FPU operations by GCC. This doesn't hold for kernelspace vs.
kernelspace, but we don't support preemption.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 18:00:07 -05:00
|
|
|
default y
|
|
|
|
|
|
|
|
|
|
config X86_USE_PPRO_CHECKSUM
|
|
|
|
|
bool
|
2006-12-06 20:14:09 -05:00
|
|
|
depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MEFFICEON || MGEODE_LX || MCORE2
|
[PATCH] uml: reuse i386 cpu-specific tuning
Make UML share the underlying cpu-specific tuning done on i386.
Actually, for now many config options aren't used a lot - but that can be done
later. Also, UML relies on GCC optimization for things like memcpy and such
more than i386, so specifying the correct -march and -mtune should be enough.
Later, we may want to correct some other stuff.
For instance, since FPU context switching, for us, is done (at least
partially, i.e. between our kernelspace and userspace) by the host, we may
allow usage of FPU operations by GCC. This doesn't hold for kernelspace vs.
kernelspace, but we don't support preemption.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 18:00:07 -05:00
|
|
|
default y
|
|
|
|
|
|
|
|
|
|
config X86_USE_3DNOW
|
|
|
|
|
bool
|
2006-10-11 04:21:35 -04:00
|
|
|
depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
|
[PATCH] uml: reuse i386 cpu-specific tuning
Make UML share the underlying cpu-specific tuning done on i386.
Actually, for now many config options aren't used a lot - but that can be done
later. Also, UML relies on GCC optimization for things like memcpy and such
more than i386, so specifying the correct -march and -mtune should be enough.
Later, we may want to correct some other stuff.
For instance, since FPU context switching, for us, is done (at least
partially, i.e. between our kernelspace and userspace) by the host, we may
allow usage of FPU operations by GCC. This doesn't hold for kernelspace vs.
kernelspace, but we don't support preemption.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 18:00:07 -05:00
|
|
|
default y
|
|
|
|
|
|
|
|
|
|
config X86_OOSTORE
|
|
|
|
|
bool
|
|
|
|
|
depends on (MWINCHIP3D || MWINCHIP2 || MWINCHIPC6) && MTRR
|
|
|
|
|
default y
|
|
|
|
|
|
|
|
|
|
config X86_TSC
|
|
|
|
|
bool
|
2006-12-06 20:14:09 -05:00
|
|
|
depends on (MWINCHIP3D || MWINCHIP2 || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MGEODEGX1 || MGEODE_LX || MCORE2) && !X86_NUMAQ
|
[PATCH] uml: reuse i386 cpu-specific tuning
Make UML share the underlying cpu-specific tuning done on i386.
Actually, for now many config options aren't used a lot - but that can be done
later. Also, UML relies on GCC optimization for things like memcpy and such
more than i386, so specifying the correct -march and -mtune should be enough.
Later, we may want to correct some other stuff.
For instance, since FPU context switching, for us, is done (at least
partially, i.e. between our kernelspace and userspace) by the host, we may
allow usage of FPU operations by GCC. This doesn't hold for kernelspace vs.
kernelspace, but we don't support preemption.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 18:00:07 -05:00
|
|
|
default y
|
