f0d1b0b30d
This facility provides three entry points:
ilog2() Log base 2 of unsigned long
ilog2_u32() Log base 2 of u32
ilog2_u64() Log base 2 of u64
These facilities can either be used inside functions on dynamic data:
int do_something(long q)
{
...;
y = ilog2(x)
...;
}
Or can be used to statically initialise global variables with constant values:
unsigned n = ilog2(27);
When performing static initialisation, the compiler will report "error:
initializer element is not constant" if asked to take a log of zero or of
something not reducible to a constant. They treat negative numbers as
unsigned.
When not dealing with a constant, they fall back to using fls() which permits
them to use arch-specific log calculation instructions - such as BSR on
x86/x86_64 or SCAN on FRV - if available.
[akpm@osdl.org: MMC fix]
Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David Howells <dhowells@redhat.com>
Cc: Wojtek Kaniewski <wojtekka@toxygen.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
649 lines
18 KiB
Plaintext
649 lines
18 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see Documentation/kbuild/kconfig-language.txt.
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#
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config ALPHA
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bool
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default y
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help
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The Alpha is a 64-bit general-purpose processor designed and
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marketed by the Digital Equipment Corporation of blessed memory,
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now Hewlett-Packard. The Alpha Linux project has a home page at
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<http://www.alphalinux.org/>.
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config 64BIT
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def_bool y
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config MMU
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bool
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default y
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config RWSEM_GENERIC_SPINLOCK
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bool
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config RWSEM_XCHGADD_ALGORITHM
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bool
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default y
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config ARCH_HAS_ILOG2_U32
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bool
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default n
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config ARCH_HAS_ILOG2_U64
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bool
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default n
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config GENERIC_FIND_NEXT_BIT
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bool
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default y
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config GENERIC_CALIBRATE_DELAY
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bool
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default y
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config GENERIC_ISA_DMA
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bool
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default y
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config GENERIC_IOMAP
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bool
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default n
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config GENERIC_HARDIRQS
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bool
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default y
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config GENERIC_IRQ_PROBE
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bool
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default y
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config AUTO_IRQ_AFFINITY
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bool
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depends on SMP
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default y
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source "init/Kconfig"
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menu "System setup"
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choice
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prompt "Alpha system type"
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default ALPHA_GENERIC
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---help---
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This is the system type of your hardware. A "generic" kernel will
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run on any supported Alpha system. However, if you configure a
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kernel for your specific system, it will be faster and smaller.
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To find out what type of Alpha system you have, you may want to
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check out the Linux/Alpha FAQ, accessible on the WWW from
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<http://www.alphalinux.org/>. In summary:
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Alcor/Alpha-XLT AS 600
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Alpha-XL XL-233, XL-266
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AlphaBook1 Alpha laptop
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Avanti AS 200, AS 205, AS 250, AS 255, AS 300, AS 400
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Cabriolet AlphaPC64, AlphaPCI64
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DP264 DP264
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EB164 EB164 21164 evaluation board
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EB64+ EB64+ 21064 evaluation board
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EB66 EB66 21066 evaluation board
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EB66+ EB66+ 21066 evaluation board
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Jensen DECpc 150, DEC 2000 model 300,
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DEC 2000 model 500
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LX164 AlphaPC164-LX
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Lynx AS 2100A
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Miata Personal Workstation 433a, 433au, 500a,
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500au, 600a, or 600au
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Marvel AlphaServer ES47 / ES80 / GS1280
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Mikasa AS 1000
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Noname AXPpci33, UDB (Multia)
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Noritake AS 1000A, AS 600A, AS 800
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PC164 AlphaPC164
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Rawhide AS 1200, AS 4000, AS 4100
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Ruffian RPX164-2, AlphaPC164-UX, AlphaPC164-BX
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SX164 AlphaPC164-SX
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Sable AS 2000, AS 2100
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Shark DS 20L
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Takara Takara
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Titan AlphaServer ES45 / DS25
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Wildfire AlphaServer GS 40/80/160/320
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If you don't know what to do, choose "generic".
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config ALPHA_GENERIC
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bool "Generic"
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help
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A generic kernel will run on all supported Alpha hardware.
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config ALPHA_ALCOR
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bool "Alcor/Alpha-XLT"
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help
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For systems using the Digital ALCOR chipset: 5 chips (4, 64-bit data
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slices (Data Switch, DSW) - 208-pin PQFP and 1 control (Control, I/O
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Address, CIA) - a 383 pin plastic PGA). It provides a DRAM
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controller (256-bit memory bus) and a PCI interface. It also does
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all the work required to support an external Bcache and to maintain
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memory coherence when a PCI device DMAs into (or out of) memory.
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config ALPHA_XL
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bool "Alpha-XL"
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help
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XL-233 and XL-266-based Alpha systems.
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config ALPHA_BOOK1
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bool "AlphaBook1"
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help
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Dec AlphaBook1/Burns Alpha-based laptops.
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config ALPHA_AVANTI_CH
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bool "Avanti"
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config ALPHA_CABRIOLET
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bool "Cabriolet"
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help
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Cabriolet AlphaPC64, AlphaPCI64 systems. Derived from EB64+ but now
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baby-AT with Flash boot ROM, no on-board SCSI or Ethernet. 3 ISA
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slots, 4 PCI slots (one pair are on a shared slot), uses plug-in
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Bcache SIMMs. Requires power supply with 3.3V output.
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config ALPHA_DP264
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bool "DP264"
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help
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Various 21264 systems with the tsunami core logic chipset.
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API Networks: 264DP, UP2000(+), CS20;
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Compaq: DS10(E,L), XP900, XP1000, DS20(E), ES40.
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config ALPHA_EB164
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bool "EB164"
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help
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EB164 21164 evaluation board from DEC. Uses 21164 and ALCOR. Has
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ISA and PCI expansion (3 ISA slots, 2 64-bit PCI slots (one is
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shared with an ISA slot) and 2 32-bit PCI slots. Uses plus-in
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Bcache SIMMs. I/O sub-system provides SuperI/O (2S, 1P, FD), KBD,
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MOUSE (PS2 style), RTC/NVRAM. Boot ROM is Flash. PC-AT-sized
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motherboard. Requires power supply with 3.3V output.
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config ALPHA_EB64P_CH
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bool "EB64+"
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config ALPHA_EB66
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bool "EB66"
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help
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A Digital DS group board. Uses 21066 or 21066A. I/O sub-system is
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identical to EB64+. Baby PC-AT size. Runs from standard PC power
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supply. The EB66 schematic was published as a marketing poster
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advertising the 21066 as "the first microprocessor in the world with
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embedded PCI".
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config ALPHA_EB66P
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bool "EB66+"
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help
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Later variant of the EB66 board.
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config ALPHA_EIGER
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bool "Eiger"
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help
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Apparently an obscure OEM single-board computer based on the
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Typhoon/Tsunami chipset family. Information on it is scanty.
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config ALPHA_JENSEN
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bool "Jensen"
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help
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DEC PC 150 AXP (aka Jensen): This is a very old Digital system - one
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of the first-generation Alpha systems. A number of these systems
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seem to be available on the second- hand market. The Jensen is a
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floor-standing tower system which originally used a 150MHz 21064 It
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used programmable logic to interface a 486 EISA I/O bridge to the
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CPU.
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config ALPHA_LX164
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bool "LX164"
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help
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A technical overview of this board is available at
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<http://www.unix-ag.org/Linux-Alpha/Architectures/LX164.html>.
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config ALPHA_LYNX
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bool "Lynx"
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help
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AlphaServer 2100A-based systems.
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config ALPHA_MARVEL
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bool "Marvel"
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help
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AlphaServer ES47 / ES80 / GS1280 based on EV7.
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config ALPHA_MIATA
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bool "Miata"
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help
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The Digital PersonalWorkStation (PWS 433a, 433au, 500a, 500au, 600a,
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or 600au). There is an Installation HOWTO for this hardware at
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<http://eijk.homelinux.org/~stefan/miata.html>.
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config ALPHA_MIKASA
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bool "Mikasa"
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help
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AlphaServer 1000-based Alpha systems.
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config ALPHA_NAUTILUS
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bool "Nautilus"
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help
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Alpha systems based on the AMD 751 & ALI 1543C chipsets.
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config ALPHA_NONAME_CH
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bool "Noname"
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config ALPHA_NORITAKE
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bool "Noritake"
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help
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AlphaServer 1000A, AlphaServer 600A, and AlphaServer 800-based
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systems.
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config ALPHA_PC164
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bool "PC164"
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config ALPHA_P2K
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bool "Platform2000"
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config ALPHA_RAWHIDE
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bool "Rawhide"
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help
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AlphaServer 1200, AlphaServer 4000 and AlphaServer 4100 machines.
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See HOWTO at
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<http://www.alphalinux.org/docs/rawhide/4100_install.shtml>.
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config ALPHA_RUFFIAN
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bool "Ruffian"
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help
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Samsung APC164UX. There is a page on known problems and workarounds
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at <http://www.alphalinux.org/faq/FAQ-11.html>.
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config ALPHA_RX164
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bool "RX164"
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config ALPHA_SX164
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bool "SX164"
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config ALPHA_SABLE
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bool "Sable"
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help
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Digital AlphaServer 2000 and 2100-based systems.
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config ALPHA_SHARK
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bool "Shark"
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config ALPHA_TAKARA
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bool "Takara"
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help
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Alpha 11164-based OEM single-board computer.
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config ALPHA_TITAN
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bool "Titan"
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help
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AlphaServer ES45/DS25 SMP based on EV68 and Titan chipset.
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config ALPHA_WILDFIRE
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bool "Wildfire"
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help
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AlphaServer GS 40/80/160/320 SMP based on the EV67 core.
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endchoice
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# clear all implied options (don't want default values for those):
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# Most of these machines have ISA slots; not exactly sure which don't,
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# and this doesn't activate hordes of code, so do it always.
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config ISA
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bool
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default y
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help
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Find out whether you have ISA slots on your motherboard. ISA is the
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name of a bus system, i.e. the way the CPU talks to the other stuff
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inside your box. Other bus systems are PCI, EISA, MicroChannel
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(MCA) or VESA. ISA is an older system, now being displaced by PCI;
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newer boards don't support it. If you have ISA, say Y, otherwise N.
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config ISA_DMA_API
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bool
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default y
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config PCI
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bool
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depends on !ALPHA_JENSEN
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default y
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help
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Find out whether you have a PCI motherboard. PCI is the name of a
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bus system, i.e. the way the CPU talks to the other stuff inside
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your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
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VESA. If you have PCI, say Y, otherwise N.
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The PCI-HOWTO, available from
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<http://www.tldp.org/docs.html#howto>, contains valuable
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information about which PCI hardware does work under Linux and which
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doesn't.
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config PCI_DOMAINS
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bool
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default y
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config ALPHA_CORE_AGP
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bool
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depends on ALPHA_GENERIC || ALPHA_TITAN || ALPHA_MARVEL
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default y
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config ALPHA_NONAME
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bool
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depends on ALPHA_BOOK1 || ALPHA_NONAME_CH
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default y
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help
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The AXPpci33 (aka NoName), is based on the EB66 (includes the Multia
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UDB). This design was produced by Digital's Technical OEM (TOEM)
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group. It uses the 21066 processor running at 166MHz or 233MHz. It
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is a baby-AT size, and runs from a standard PC power supply. It has
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5 ISA slots and 3 PCI slots (one pair are a shared slot). There are
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2 versions, with either PS/2 or large DIN connectors for the
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keyboard.
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config ALPHA_EV4
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bool
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depends on ALPHA_JENSEN || (ALPHA_SABLE && !ALPHA_GAMMA) || ALPHA_LYNX || ALPHA_NORITAKE && !ALPHA_PRIMO || ALPHA_MIKASA && !ALPHA_PRIMO || ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P_CH || ALPHA_XL || ALPHA_NONAME || ALPHA_EB66 || ALPHA_EB66P || ALPHA_P2K
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default y if !ALPHA_LYNX
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config ALPHA_LCA
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bool
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depends on ALPHA_NONAME || ALPHA_EB66 || ALPHA_EB66P || ALPHA_P2K
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default y
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config ALPHA_APECS
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bool
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depends on !ALPHA_PRIMO && (ALPHA_NORITAKE || ALPHA_MIKASA) || ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P_CH || ALPHA_XL
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default y
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config ALPHA_EB64P
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bool
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depends on ALPHA_CABRIOLET || ALPHA_EB64P_CH
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default y
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help
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Uses 21064 or 21064A and APECs. Has ISA and PCI expansion (3 ISA,
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2 PCI, one pair are on a shared slot). Supports 36-bit DRAM SIMs.
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ISA bus generated by Intel SaturnI/O PCI-ISA bridge. On-board SCSI
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(NCR 810 on PCI) Ethernet (Digital 21040), KBD, MOUSE (PS2 style),
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SuperI/O (2S, 1P, FD), RTC/NVRAM. Boot ROM is EPROM. PC-AT size.
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Runs from standard PC power supply.
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config ALPHA_EV5
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bool "EV5 CPU(s) (model 5/xxx)?" if ALPHA_LYNX
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default y if ALPHA_RX164 || ALPHA_RAWHIDE || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_SABLE && ALPHA_GAMMA || ALPHA_NORITAKE && ALPHA_PRIMO || ALPHA_MIKASA && ALPHA_PRIMO || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR
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config ALPHA_EV4
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bool
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default y if ALPHA_LYNX && !ALPHA_EV5
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config ALPHA_CIA
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bool
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depends on ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_NORITAKE && ALPHA_PRIMO || ALPHA_MIKASA && ALPHA_PRIMO || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR
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default y
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config ALPHA_EV56
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bool "EV56 CPU (speed >= 366MHz)?" if ALPHA_ALCOR
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default y if ALPHA_RX164 || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_PC164 || ALPHA_TAKARA
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config ALPHA_EV56
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prompt "EV56 CPU (speed >= 333MHz)?"
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depends on ALPHA_NORITAKE || ALPHA_PRIMO
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config ALPHA_EV56
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prompt "EV56 CPU (speed >= 400MHz)?"
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depends on ALPHA_RAWHIDE
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config ALPHA_PRIMO
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bool "EV5 CPU daughtercard (model 5/xxx)?"
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depends on ALPHA_NORITAKE || ALPHA_MIKASA
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help
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Say Y if you have an AS 1000 5/xxx or an AS 1000A 5/xxx.
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config ALPHA_GAMMA
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bool "EV5 CPU(s) (model 5/xxx)?"
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depends on ALPHA_SABLE
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help
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Say Y if you have an AS 2000 5/xxx or an AS 2100 5/xxx.
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config ALPHA_GAMMA
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bool
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depends on ALPHA_LYNX
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default y
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config ALPHA_T2
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bool
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depends on ALPHA_SABLE || ALPHA_LYNX
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default y
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config ALPHA_PYXIS
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bool
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depends on ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN
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default y
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config ALPHA_EV6
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bool
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depends on ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER || ALPHA_MARVEL
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default y
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config ALPHA_TSUNAMI
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bool
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depends on ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER
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default y
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config ALPHA_EV67
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bool "EV67 (or later) CPU (speed > 600MHz)?" if ALPHA_DP264 || ALPHA_EIGER
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default y if ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL
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help
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Is this a machine based on the EV67 core? If in doubt, select N here
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and the machine will be treated as an EV6.
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config ALPHA_EV7
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bool
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depends on ALPHA_MARVEL
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default y
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config ALPHA_MCPCIA
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bool
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depends on ALPHA_RAWHIDE
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default y
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config ALPHA_POLARIS
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bool
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depends on ALPHA_RX164
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default y
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config ALPHA_IRONGATE
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bool
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depends on ALPHA_NAUTILUS
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default y
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config GENERIC_HWEIGHT
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bool
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default y if !ALPHA_EV67
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config ALPHA_AVANTI
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bool
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depends on ALPHA_XL || ALPHA_AVANTI_CH
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default y
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help
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Avanti AS 200, AS 205, AS 250, AS 255, AS 300, and AS 400-based
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Alphas. Info at
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<http://www.unix-ag.org/Linux-Alpha/Architectures/Avanti.html>.
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config ALPHA_BROKEN_IRQ_MASK
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bool
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depends on ALPHA_GENERIC || ALPHA_PC164
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default y
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config ALPHA_SRM
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bool "Use SRM as bootloader" if ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_NAUTILUS || ALPHA_NONAME
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default y if ALPHA_JENSEN || ALPHA_MIKASA || ALPHA_SABLE || ALPHA_LYNX || ALPHA_NORITAKE || ALPHA_DP264 || ALPHA_RAWHIDE || ALPHA_EIGER || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL
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---help---
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There are two different types of booting firmware on Alphas: SRM,
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which is command line driven, and ARC, which uses menus and arrow
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keys. Details about the Linux/Alpha booting process are contained in
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the Linux/Alpha FAQ, accessible on the WWW from
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<http://www.alphalinux.org/>.
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The usual way to load Linux on an Alpha machine is to use MILO
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(a bootloader that lets you pass command line parameters to the
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kernel just like lilo does for the x86 architecture) which can be
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loaded either from ARC or can be installed directly as a permanent
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firmware replacement from floppy (which requires changing a certain
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jumper on the motherboard). If you want to do either of these, say N
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here. If MILO doesn't work on your system (true for Jensen
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motherboards), you can bypass it altogether and boot Linux directly
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from an SRM console; say Y here in order to do that. Note that you
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won't be able to boot from an IDE disk using SRM.
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If unsure, say N.
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config EISA
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bool
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depends on ALPHA_GENERIC || ALPHA_JENSEN || ALPHA_ALCOR || ALPHA_MIKASA || ALPHA_SABLE || ALPHA_LYNX || ALPHA_NORITAKE || ALPHA_RAWHIDE
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default y
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config ARCH_MAY_HAVE_PC_FDC
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def_bool y
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config SMP
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bool "Symmetric multi-processing support"
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depends on ALPHA_SABLE || ALPHA_LYNX || ALPHA_RAWHIDE || ALPHA_DP264 || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_GENERIC || ALPHA_SHARK || ALPHA_MARVEL
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---help---
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This enables support for systems with more than one CPU. If you have
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a system with only one CPU, like most personal computers, say N. If
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you have a system with more than one CPU, say Y.
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If you say N here, the kernel will run on single and multiprocessor
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machines, but will use only one CPU of a multiprocessor machine. If
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you say Y here, the kernel will run on many, but not all,
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singleprocessor machines. On a singleprocessor machine, the kernel
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will run faster if you say N here.
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See also the <file:Documentation/smp.txt>, and the SMP-HOWTO
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available at <http://www.tldp.org/docs.html#howto>.
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If you don't know what to do here, say N.
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config HAVE_DEC_LOCK
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bool
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depends on SMP
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default y
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config NR_CPUS
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int "Maximum number of CPUs (2-64)"
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range 2 64
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depends on SMP
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default "64"
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config ARCH_DISCONTIGMEM_ENABLE
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bool "Discontiguous Memory Support (EXPERIMENTAL)"
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depends on EXPERIMENTAL
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help
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Say Y to support efficient handling of discontiguous physical memory,
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for architectures which are either NUMA (Non-Uniform Memory Access)
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or have huge holes in the physical address space for other reasons.
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See <file:Documentation/vm/numa> for more.
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source "mm/Kconfig"
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config NUMA
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bool "NUMA Support (EXPERIMENTAL)"
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depends on DISCONTIGMEM && BROKEN
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help
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Say Y to compile the kernel to support NUMA (Non-Uniform Memory
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Access). This option is for configuring high-end multiprocessor
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server machines. If in doubt, say N.
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config NODES_SHIFT
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int
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default "7"
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depends on NEED_MULTIPLE_NODES
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# LARGE_VMALLOC is racy, if you *really* need it then fix it first
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config ALPHA_LARGE_VMALLOC
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bool
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---help---
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Process creation and other aspects of virtual memory management can
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be streamlined if we restrict the kernel to one PGD for all vmalloc
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allocations. This equates to about 8GB.
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Under normal circumstances, this is so far and above what is needed
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as to be laughable. However, there are certain applications (such
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as benchmark-grade in-kernel web serving) that can make use of as
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much vmalloc space as is available.
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Say N unless you know you need gobs and gobs of vmalloc space.
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config VERBOSE_MCHECK
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bool "Verbose Machine Checks"
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config VERBOSE_MCHECK_ON
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int "Verbose Printing Mode (0=off, 1=on, 2=all)"
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depends on VERBOSE_MCHECK
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default 1
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---help---
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This option allows the default printing mode to be set, and then
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possibly overridden by a boot command argument.
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For example, if one wanted the option of printing verbose
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machine checks, but wanted the default to be as if verbose
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machine check printing was turned off, then one would choose
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the printing mode to be 0. Then, upon reboot, one could add
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the boot command line "verbose_mcheck=1" to get the normal
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verbose machine check printing, or "verbose_mcheck=2" to get
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the maximum information available.
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Take the default (1) unless you want more control or more info.
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source "drivers/pci/Kconfig"
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source "drivers/eisa/Kconfig"
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source "drivers/pcmcia/Kconfig"
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config SRM_ENV
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tristate "SRM environment through procfs"
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depends on PROC_FS
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---help---
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If you enable this option, a subdirectory inside /proc called
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/proc/srm_environment will give you access to the all important
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SRM environment variables (those which have a name) and also
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to all others (by their internal number).
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SRM is something like a BIOS for Alpha machines. There are some
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other such BIOSes, like AlphaBIOS, which this driver cannot
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support (hey, that's not SRM!).
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Despite the fact that this driver doesn't work on all Alphas (but
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only on those which have SRM as their firmware), it's save to
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build it even if your particular machine doesn't know about SRM
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(or if you intend to compile a generic kernel). It will simply
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not create those subdirectory in /proc (and give you some warning,
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of course).
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This driver is also available as a module and will be called
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srm_env then.
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source "fs/Kconfig.binfmt"
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endmenu
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source "net/Kconfig"
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source "drivers/Kconfig"
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source "fs/Kconfig"
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source "arch/alpha/oprofile/Kconfig"
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source "arch/alpha/Kconfig.debug"
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source "security/Kconfig"
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source "crypto/Kconfig"
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source "lib/Kconfig"
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