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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>
314 lines
8.6 KiB
Plaintext
314 lines
8.6 KiB
Plaintext
# $Id: config.in,v 1.113 2002/01/24 22:14:44 davem Exp $
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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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mainmenu "Linux/SPARC Kernel Configuration"
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config MMU
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bool
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default y
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config HIGHMEM
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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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source "init/Kconfig"
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menu "General machine setup"
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config SMP
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bool "Symmetric multi-processing support (does not work on sun4/sun4c)"
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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, say N. If you have a system with more
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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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People using multiprocessor machines who say Y here should also say
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Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
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Management" code will be disabled if you say Y here.
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See also the <file:Documentation/smp.txt>,
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<file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
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<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 NR_CPUS
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int "Maximum number of CPUs (2-32)"
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range 2 32
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depends on SMP
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default "32"
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config SPARC
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bool
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default y
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# Identify this as a Sparc32 build
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config SPARC32
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bool
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default y
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help
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SPARC is a family of RISC microprocessors designed and marketed by
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Sun Microsystems, incorporated. They are very widely found in Sun
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workstations and clones. This port covers the original 32-bit SPARC;
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it is old and stable and usually considered one of the "big three"
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along with the Intel and Alpha ports. The UltraLinux project
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maintains both the SPARC32 and SPARC64 ports; its web page is
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available at <http://www.ultralinux.org/>.
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# Global things across all Sun machines.
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config ISA
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bool
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help
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ISA is found on Espresso only and is not supported currently.
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Say N
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config EISA
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bool
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help
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EISA is not supported.
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Say N
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config MCA
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bool
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help
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MCA is not supported.
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Say N
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config PCMCIA
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tristate
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---help---
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Say Y here if you want to attach PCMCIA- or PC-cards to your Linux
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computer. These are credit-card size devices such as network cards,
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modems or hard drives often used with laptops computers. There are
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actually two varieties of these cards: the older 16 bit PCMCIA cards
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and the newer 32 bit CardBus cards. If you want to use CardBus
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cards, you need to say Y here and also to "CardBus support" below.
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To use your PC-cards, you will need supporting software from David
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Hinds' pcmcia-cs package (see the file <file:Documentation/Changes>
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for location). Please also read the PCMCIA-HOWTO, available from
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<http://www.tldp.org/docs.html#howto>.
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To compile this driver as modules, choose M here: the
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modules will be called pcmcia_core and ds.
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config SBUS
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bool
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default y
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config SBUSCHAR
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bool
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default y
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config SERIAL_CONSOLE
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bool
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default y
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---help---
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If you say Y here, it will be possible to use a serial port as the
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system console (the system console is the device which receives all
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kernel messages and warnings and which allows logins in single user
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mode). This could be useful if some terminal or printer is connected
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to that serial port.
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Even if you say Y here, the currently visible virtual console
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(/dev/tty0) will still be used as the system console by default, but
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you can alter that using a kernel command line option such as
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"console=ttyS1". (Try "man bootparam" or see the documentation of
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your boot loader (silo) about how to pass options to the kernel at
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boot time.)
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If you don't have a graphics card installed and you say Y here, the
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kernel will automatically use the first serial line, /dev/ttyS0, as
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system console.
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If unsure, say N.
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config SUN_AUXIO
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bool
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default y
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config SUN_IO
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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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default y
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config RWSEM_XCHGADD_ALGORITHM
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bool
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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_HWEIGHT
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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 ARCH_MAY_HAVE_PC_FDC
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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 SUN_PM
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bool
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default y
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help
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Enable power management and CPU standby features on supported
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SPARC platforms.
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config SUN4
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bool "Support for SUN4 machines (disables SUN4[CDM] support)"
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depends on !SMP
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default n
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help
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Say Y here if, and only if, your machine is a sun4. Note that
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a kernel compiled with this option will run only on sun4.
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(And the current version will probably work only on sun4/330.)
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if !SUN4
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config PCI
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bool "Support for PCI and PS/2 keyboard/mouse"
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help
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CONFIG_PCI is needed for all JavaStation's (including MrCoffee),
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CP-1200, JavaEngine-1, Corona, Red October, and Serengeti SGSC.
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All of these platforms are extremely obscure, so say N if unsure.
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source "drivers/pci/Kconfig"
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endif
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config SUN_OPENPROMFS
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tristate "Openprom tree appears in /proc/openprom"
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help
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If you say Y, the OpenPROM device tree will be available as a
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virtual file system, which you can mount to /proc/openprom by "mount
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-t openpromfs none /proc/openprom".
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To compile the /proc/openprom support as a module, choose M here: the
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module will be called openpromfs.
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Only choose N if you know in advance that you will not need to modify
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OpenPROM settings on the running system.
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config SPARC_LED
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tristate "Sun4m LED driver"
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help
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This driver toggles the front-panel LED on sun4m systems
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in a user-specifiable manner. Its state can be probed
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by reading /proc/led and its blinking mode can be changed
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via writes to /proc/led
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source "fs/Kconfig.binfmt"
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config SUNOS_EMUL
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bool "SunOS binary emulation"
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help
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This allows you to run most SunOS binaries. If you want to do this,
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say Y here and place appropriate files in /usr/gnemul/sunos. See
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<http://www.ultralinux.org/faq.html> for more information. If you
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want to run SunOS binaries on an Ultra you must also say Y to
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"Kernel support for 32-bit a.out binaries" above.
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source "mm/Kconfig"
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endmenu
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source "net/Kconfig"
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source "drivers/Kconfig"
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if !SUN4
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source "drivers/sbus/char/Kconfig"
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endif
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# This one must be before the filesystem configs. -DaveM
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menu "Unix98 PTY support"
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config UNIX98_PTYS
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bool "Unix98 PTY support"
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---help---
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A pseudo terminal (PTY) is a software device consisting of two
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halves: a master and a slave. The slave device behaves identical to
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a physical terminal; the master device is used by a process to
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read data from and write data to the slave, thereby emulating a
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terminal. Typical programs for the master side are telnet servers
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and xterms.
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Linux has traditionally used the BSD-like names /dev/ptyxx for
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masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
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has a number of problems. The GNU C library glibc 2.1 and later,
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however, supports the Unix98 naming standard: in order to acquire a
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pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
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terminal is then made available to the process and the pseudo
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terminal slave can be accessed as /dev/pts/<number>. What was
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traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
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The entries in /dev/pts/ are created on the fly by a virtual
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file system; therefore, if you say Y here you should say Y to
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"/dev/pts file system for Unix98 PTYs" as well.
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If you want to say Y here, you need to have the C library glibc 2.1
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or later (equal to libc-6.1, check with "ls -l /lib/libc.so.*").
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Read the instructions in <file:Documentation/Changes> pertaining to
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pseudo terminals. It's safe to say N.
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config UNIX98_PTY_COUNT
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int "Maximum number of Unix98 PTYs in use (0-2048)"
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depends on UNIX98_PTYS
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default "256"
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help
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The maximum number of Unix98 PTYs that can be used at any one time.
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The default is 256, and should be enough for desktop systems. Server
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machines which support incoming telnet/rlogin/ssh connections and/or
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serve several X terminals may want to increase this: every incoming
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connection and every xterm uses up one PTY.
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When not in use, each additional set of 256 PTYs occupy
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approximately 8 KB of kernel memory on 32-bit architectures.
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endmenu
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source "fs/Kconfig"
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menu "Instrumentation Support"
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depends on EXPERIMENTAL
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source "arch/sparc/oprofile/Kconfig"
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endmenu
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source "arch/sparc/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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