linux/arch/m32r/Kconfig

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config M32R
bool
default y
select HAVE_IDE
select HAVE_OPROFILE
select INIT_ALL_POSSIBLE
select HAVE_KERNEL_GZIP
select HAVE_KERNEL_BZIP2
select HAVE_KERNEL_LZMA
config SBUS
bool
config GENERIC_ISA_DMA
bool
default y
config ZONE_DMA
bool
default y
config GENERIC_HARDIRQS
bool
default y
config GENERIC_IRQ_PROBE
bool
default y
config NO_IOPORT
def_bool y
config NO_DMA
def_bool y
avoid overflows in kernel/time.c When the conversion factor between jiffies and milli- or microseconds is not a single multiply or divide, as for the case of HZ == 300, we currently do a multiply followed by a divide. The intervening result, however, is subject to overflows, especially since the fraction is not simplified (for HZ == 300, we multiply by 300 and divide by 1000). This is exposed to the user when passing a large timeout to poll(), for example. This patch replaces the multiply-divide with a reciprocal multiplication on 32-bit platforms. When the input is an unsigned long, there is no portable way to do this on 64-bit platforms there is no portable way to do this since it requires a 128-bit intermediate result (which gcc does support on 64-bit platforms but may generate libgcc calls, e.g. on 64-bit s390), but since the output is a 32-bit integer in the cases affected, just simplify the multiply-divide (*3/10 instead of *300/1000). The reciprocal multiply used can have off-by-one errors in the upper half of the valid output range. This could be avoided at the expense of having to deal with a potential 65-bit intermediate result. Since the intent is to avoid overflow problems and most of the other time conversions are only semiexact, the off-by-one errors were considered an acceptable tradeoff. At Ralf Baechle's suggestion, this version uses a Perl script to compute the necessary constants. We already have dependencies on Perl for kernel compiles. This does, however, require the Perl module Math::BigInt, which is included in the standard Perl distribution starting with version 5.8.0. In order to support older versions of Perl, include a table of canned constants in the script itself, and structure the script so that Math::BigInt isn't required if pulling values from said table. Running the script requires that the HZ value is available from the Makefile. Thus, this patch also adds the Kconfig variable CONFIG_HZ to the architectures which didn't already have it (alpha, cris, frv, h8300, m32r, m68k, m68knommu, sparc, v850, and xtensa.) It does *not* touch the sh or sh64 architectures, since Paul Mundt has dealt with those separately in the sh tree. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Cc: Ralf Baechle <ralf@linux-mips.org>, Cc: Sam Ravnborg <sam@ravnborg.org>, Cc: Paul Mundt <lethal@linux-sh.org>, Cc: Richard Henderson <rth@twiddle.net>, Cc: Michael Starvik <starvik@axis.com>, Cc: David Howells <dhowells@redhat.com>, Cc: Yoshinori Sato <ysato@users.sourceforge.jp>, Cc: Hirokazu Takata <takata@linux-m32r.org>, Cc: Geert Uytterhoeven <geert@linux-m68k.org>, Cc: Roman Zippel <zippel@linux-m68k.org>, Cc: William L. Irwin <sparclinux@vger.kernel.org>, Cc: Chris Zankel <chris@zankel.net>, Cc: H. Peter Anvin <hpa@zytor.com>, Cc: Jan Engelhardt <jengelh@computergmbh.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-08 12:21:26 +00:00
config HZ
int
default 100
config ARCH_USES_GETTIMEOFFSET
def_bool y
source "init/Kconfig"
container freezer: implement freezer cgroup subsystem This patch implements a new freezer subsystem in the control groups framework. It provides a way to stop and resume execution of all tasks in a cgroup by writing in the cgroup filesystem. The freezer subsystem in the container filesystem defines a file named freezer.state. Writing "FROZEN" to the state file will freeze all tasks in the cgroup. Subsequently writing "RUNNING" will unfreeze the tasks in the cgroup. Reading will return the current state. * Examples of usage : # mkdir /containers/freezer # mount -t cgroup -ofreezer freezer /containers # mkdir /containers/0 # echo $some_pid > /containers/0/tasks to get status of the freezer subsystem : # cat /containers/0/freezer.state RUNNING to freeze all tasks in the container : # echo FROZEN > /containers/0/freezer.state # cat /containers/0/freezer.state FREEZING # cat /containers/0/freezer.state FROZEN to unfreeze all tasks in the container : # echo RUNNING > /containers/0/freezer.state # cat /containers/0/freezer.state RUNNING This is the basic mechanism which should do the right thing for user space task in a simple scenario. It's important to note that freezing can be incomplete. In that case we return EBUSY. This means that some tasks in the cgroup are busy doing something that prevents us from completely freezing the cgroup at this time. After EBUSY, the cgroup will remain partially frozen -- reflected by freezer.state reporting "FREEZING" when read. The state will remain "FREEZING" until one of these things happens: 1) Userspace cancels the freezing operation by writing "RUNNING" to the freezer.state file 2) Userspace retries the freezing operation by writing "FROZEN" to the freezer.state file (writing "FREEZING" is not legal and returns EIO) 3) The tasks that blocked the cgroup from entering the "FROZEN" state disappear from the cgroup's set of tasks. [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: export thaw_process] Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Signed-off-by: Matt Helsley <matthltc@us.ibm.com> Acked-by: Serge E. Hallyn <serue@us.ibm.com> Tested-by: Matt Helsley <matthltc@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-19 03:27:21 +00:00
source "kernel/Kconfig.freezer"
menu "Processor type and features"
choice
prompt "Platform Type"
default PLAT_MAPPI
config PLAT_MAPPI
bool "Mappi-I"
help
The Mappi-I is an FPGA board for SOC (System-On-a-Chip) prototyping.
You can operate a Linux system on this board by using an M32R
softmacro core, which is a fully-synthesizable functional model
described in Verilog-HDL.
The Mappi-I board was the first platform, which had been used
to port and develop a Linux system for the M32R processor.
Currently, the Mappi-II, an heir to the Mappi-I, is available.
config PLAT_USRV
bool "uServer"
select PLAT_HAS_INT1ICU
config PLAT_M32700UT
bool "M32700UT"
select PLAT_HAS_INT0ICU
select PLAT_HAS_INT1ICU
select PLAT_HAS_INT2ICU
help
The M3T-M32700UT is an evaluation board based on uT-Engine
specification. This board has an M32700 (Chaos) evaluation chip.
You can say Y for SMP, because the M32700 is a single chip
multiprocessor.
config PLAT_OPSPUT
bool "OPSPUT"
select PLAT_HAS_INT0ICU
select PLAT_HAS_INT1ICU
select PLAT_HAS_INT2ICU
help
The OPSPUT is an evaluation board based on uT-Engine
specification. This board has a OPSP-REP chip.
config PLAT_OAKS32R
bool "OAKS32R"
help
The OAKS32R is a tiny, inexpensive evaluation board.
Please note that if you say Y here and choose chip "M32102",
say N for MMU and select a no-MMU version kernel, otherwise
a kernel with MMU support will not work, because the M32102
is a microcontroller for embedded systems and it has no MMU.
config PLAT_MAPPI2
bool "Mappi-II(M3A-ZA36/M3A-ZA52)"
config PLAT_MAPPI3
bool "Mappi-III(M3A-2170)"
config PLAT_M32104UT
bool "M32104UT"
select PLAT_HAS_INT1ICU
help
The M3T-M32104UT is an reference board based on uT-Engine
specification. This board has a M32104 chip.
endchoice
choice
prompt "Processor family"
default CHIP_M32700
config CHIP_M32700
bool "M32700 (Chaos)"
config CHIP_M32102
bool "M32102"
config CHIP_M32104
bool "M32104"
depends on PLAT_M32104UT
config CHIP_VDEC2
bool "VDEC2"
config CHIP_OPSP
bool "OPSP"
endchoice
config MMU
bool "Support for memory management hardware"
depends on CHIP_M32700 || CHIP_VDEC2 || CHIP_OPSP
default y
config TLB_ENTRIES
int "TLB Entries"
depends on CHIP_M32700 || CHIP_VDEC2 || CHIP_OPSP
default 32 if CHIP_M32700 || CHIP_OPSP
default 16 if CHIP_VDEC2
config ISA_M32R
bool
depends on CHIP_M32102 || CHIP_M32104
default y
config ISA_M32R2
bool
depends on CHIP_M32700 || CHIP_VDEC2 || CHIP_OPSP
default y
config ISA_DSP_LEVEL2
bool
depends on CHIP_M32700 || CHIP_OPSP
default y
config ISA_DUAL_ISSUE
bool
depends on CHIP_M32700 || CHIP_OPSP
default y
config PLAT_HAS_INT0ICU
bool
default n
config PLAT_HAS_INT1ICU
bool
default n
config PLAT_HAS_INT2ICU
bool
default n
config BUS_CLOCK
int "Bus Clock [Hz] (integer)"
default "70000000" if PLAT_MAPPI
default "25000000" if PLAT_USRV
default "50000000" if PLAT_MAPPI3
default "50000000" if PLAT_M32700UT
default "50000000" if PLAT_OPSPUT
default "54000000" if PLAT_M32104UT
default "33333333" if PLAT_OAKS32R
default "20000000" if PLAT_MAPPI2
config TIMER_DIVIDE
int "Timer divider (integer)"
default "128"
config CPU_LITTLE_ENDIAN
bool "Generate little endian code"
default n
config MEMORY_START
hex "Physical memory start address (hex)"
default "08000000" if PLAT_MAPPI || PLAT_MAPPI2 || PLAT_MAPPI3
default "08000000" if PLAT_USRV
default "08000000" if PLAT_M32700UT
default "08000000" if PLAT_OPSPUT
default "04000000" if PLAT_M32104UT
default "01000000" if PLAT_OAKS32R
config MEMORY_SIZE
hex "Physical memory size (hex)"
default "08000000" if PLAT_MAPPI3
default "04000000" if PLAT_MAPPI || PLAT_MAPPI2
default "02000000" if PLAT_USRV
default "01000000" if PLAT_M32700UT
default "01000000" if PLAT_OPSPUT
default "01000000" if PLAT_M32104UT
default "00800000" if PLAT_OAKS32R
config ARCH_DISCONTIGMEM_ENABLE
bool "Internal RAM Support"
depends on CHIP_M32700 || CHIP_M32102 || CHIP_VDEC2 || CHIP_OPSP || CHIP_M32104
default y
source "mm/Kconfig"
config IRAM_START
hex "Internal memory start address (hex)"
default "00f00000" if !CHIP_M32104
default "00700000" if CHIP_M32104
depends on (CHIP_M32700 || CHIP_M32102 || CHIP_VDEC2 || CHIP_OPSP || CHIP_M32104) && DISCONTIGMEM
config IRAM_SIZE
hex "Internal memory size (hex)"
depends on (CHIP_M32700 || CHIP_M32102 || CHIP_VDEC2 || CHIP_OPSP || CHIP_M32104) && DISCONTIGMEM
default "00080000" if CHIP_M32700
default "00010000" if CHIP_M32102 || CHIP_OPSP || CHIP_M32104
default "00008000" if CHIP_VDEC2
#
# Define implied options from the CPU selection here
#
config GENERIC_LOCKBREAK
bool
default y
depends on SMP && PREEMPT
config RWSEM_GENERIC_SPINLOCK
bool
depends on M32R
default y
config RWSEM_XCHGADD_ALGORITHM
bool
default n
config ARCH_HAS_ILOG2_U32
bool
default n
config ARCH_HAS_ILOG2_U64
bool
default n
config GENERIC_FIND_NEXT_BIT
bool
default y
config GENERIC_HWEIGHT
bool
default y
config GENERIC_CALIBRATE_DELAY
bool
default y
config SCHED_OMIT_FRAME_POINTER
m32r: fix switch_to macro to push/pop frame pointer if needed This patch fixes a rarely-happened but severe scheduling problem of the recent m32r kernel of 2.6.17-rc3 or later. In the following previous m32r patch, the switch_to macro was modified not to do unnecessary push/pop operations for tuning. > [PATCH] m32r: update switch_to macro for tuning > 4127272c38619c56f0c1aa01d01c7bd757db70a1 In this modification, only 'lr' and 'sp' registers are push/pop'ed, assuming that the m32r kernel is always compiled with -fomit-frame-pointer option. However, in 2.6 kernel, kernel/sched.c is irregularly compiled with -fno-omit-frame-pointer if CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER is not defined. -- kernel/Makefile -- : ifneq ($(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER),y) # According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is # needed for x86 only. Why this used to be enabled for all architectures is beyond # me. I suspect most platforms don't need this, but until we know that for sure # I turn this off for IA-64 only. Andreas Schwab says it's also needed on m68k # to get a correct value for the wait-channel (WCHAN in ps). --davidm CFLAGS_sched.o := $(PROFILING) -fno-omit-frame-pointer endif : --- Therefore, for the recent m32r kernel, we have to push/pop 'fp' (frame pointer) if CONFIG_FRAME_POINTER is defined or CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER is not defined. Signed-off-by: Hitoshi Yamamoto <hitoshiy@linux-m32r.org> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-11 05:22:25 +00:00
bool
default y
config PREEMPT
bool "Preemptible Kernel"
help
This option reduces the latency of the kernel when reacting to
real-time or interactive events by allowing a low priority process to
be preempted even if it is in kernel mode executing a system call.
This allows applications to run more reliably even when the system is
under load.
Say Y here if you are building a kernel for a desktop, embedded
or real-time system. Say N if you are unsure.
config SMP
bool "Symmetric multi-processing support"
select USE_GENERIC_SMP_HELPERS
---help---
This enables support for systems with more than one CPU. If you have
a system with only one CPU, like most personal computers, say N. If
you have a system with more than one CPU, say Y.
If you say N here, the kernel will run on single and multiprocessor
machines, but will use only one CPU of a multiprocessor machine. If
you say Y here, the kernel will run on many, but not all,
singleprocessor machines. On a singleprocessor machine, the kernel
will run faster if you say N here.
People using multiprocessor machines who say Y here should also say
Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
Management" code will be disabled if you say Y here.
See also the SMP-HOWTO available at
<http://tldp.org/HOWTO/SMP-HOWTO.html>.
If you don't know what to do here, say N.
config CHIP_M32700_TS1
bool "Workaround code for the M32700 TS1 chip's bug"
depends on (CHIP_M32700 && SMP)
default n
config NR_CPUS
int "Maximum number of CPUs (2-32)"
range 2 32
depends on SMP
default "2"
help
This allows you to specify the maximum number of CPUs which this
kernel will support. The maximum supported value is 32 and the
minimum value which makes sense is 2.
This is purely to save memory - each supported CPU adds
approximately eight kilobytes to the kernel image.
# Common NUMA Features
config NUMA
bool "Numa Memory Allocation Support"
depends on SMP && BROKEN
default n
[PATCH] Configurable NODES_SHIFT Current implementations define NODES_SHIFT in include/asm-xxx/numnodes.h for each arch. Its definition is sometimes configurable. Indeed, ia64 defines 5 NODES_SHIFT values in the current git tree. But it looks a bit messy. SGI-SN2(ia64) system requires 1024 nodes, and the number of nodes already has been changeable by config. Suitable node's number may be changed in the future even if it is other architecture. So, I wrote configurable node's number. This patch set defines just default value for each arch which needs multi nodes except ia64. But, it is easy to change to configurable if necessary. On ia64 the number of nodes can be already configured in generic ia64 and SN2 config. But, NODES_SHIFT is defined for DIG64 and HP'S machine too. So, I changed it so that all platforms can be configured via CONFIG_NODES_SHIFT. It would be simpler. See also: http://marc.theaimsgroup.com/?l=linux-kernel&m=114358010523896&w=2 Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Andi Kleen <ak@muc.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Richard Henderson <rth@twiddle.net> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Jack Steiner <steiner@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-04-11 05:53:53 +00:00
config NODES_SHIFT
int
default "1"
depends on NEED_MULTIPLE_NODES
# turning this on wastes a bunch of space.
# Summit needs it only when NUMA is on
config BOOT_IOREMAP
bool
depends on NUMA
default n
endmenu
menu "Bus options (PCI, PCMCIA, EISA, MCA, ISA)"
config PCI
bool "PCI support"
depends on BROKEN
default n
help
Find out whether you have a PCI motherboard. PCI is the name of a
bus system, i.e. the way the CPU talks to the other stuff inside
your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
VESA. If you have PCI, say Y, otherwise N.
choice
prompt "PCI access mode"
depends on PCI
default PCI_GOANY
config PCI_GOBIOS
bool "BIOS"
---help---
On PCI systems, the BIOS can be used to detect the PCI devices and
determine their configuration. However, some old PCI motherboards
have BIOS bugs and may crash if this is done. Also, some embedded
PCI-based systems don't have any BIOS at all. Linux can also try to
detect the PCI hardware directly without using the BIOS.
With this option, you can specify how Linux should detect the PCI
devices. If you choose "BIOS", the BIOS will be used, if you choose
"Direct", the BIOS won't be used, and if you choose "Any", the
kernel will try the direct access method and falls back to the BIOS
if that doesn't work. If unsure, go with the default, which is
"Any".
config PCI_GODIRECT
bool "Direct"
config PCI_GOANY
bool "Any"
endchoice
config PCI_BIOS
bool
depends on PCI && (PCI_GOBIOS || PCI_GOANY)
default y
config PCI_DIRECT
bool
depends on PCI && (PCI_GODIRECT || PCI_GOANY)
default y
source "drivers/pci/Kconfig"
config ISA
bool
source "drivers/pcmcia/Kconfig"
source "drivers/pci/hotplug/Kconfig"
endmenu
menu "Executable file formats"
source "fs/Kconfig.binfmt"
endmenu
source "net/Kconfig"
source "drivers/Kconfig"
source "fs/Kconfig"
source "arch/m32r/Kconfig.debug"
source "security/Kconfig"
source "crypto/Kconfig"
source "lib/Kconfig"