bdc807871d
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>
398 lines
9.2 KiB
Plaintext
398 lines
9.2 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 FRV
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bool
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default y
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config ZONE_DMA
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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 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_HARDIRQS_NO__DO_IRQ
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bool
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default y
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config GENERIC_TIME
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bool
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default y
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config TIME_LOW_RES
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bool
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default y
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config QUICKLIST
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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 y
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config ARCH_HAS_ILOG2_U64
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bool
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default y
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config HZ
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int
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default 1000
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mainmenu "Fujitsu FR-V Kernel Configuration"
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source "init/Kconfig"
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menu "Fujitsu FR-V system setup"
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config MMU
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bool "MMU support"
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help
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This options switches on and off support for the FR-V MMU
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(effectively switching between vmlinux and uClinux). Not all FR-V
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CPUs support this. Currently only the FR451 has a sufficiently
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featured MMU.
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config FRV_OUTOFLINE_ATOMIC_OPS
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bool "Out-of-line the FRV atomic operations"
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default n
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help
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Setting this option causes the FR-V atomic operations to be mostly
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implemented out-of-line.
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See Documentation/frv/atomic-ops.txt for more information.
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config HIGHMEM
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bool "High memory support"
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depends on MMU
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default y
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help
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If you wish to use more than 256MB of memory with your MMU based
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system, you will need to select this option. The kernel can only see
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the memory between 0xC0000000 and 0xD0000000 directly... everything
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else must be kmapped.
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The arch is, however, capable of supporting up to 3GB of SDRAM.
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config HIGHPTE
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bool "Allocate page tables in highmem"
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depends on HIGHMEM
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default y
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help
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The VM uses one page of memory for each page table. For systems
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with a lot of RAM, this can be wasteful of precious low memory.
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Setting this option will put user-space page tables in high memory.
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source "mm/Kconfig"
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choice
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prompt "uClinux kernel load address"
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depends on !MMU
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default UCPAGE_OFFSET_C0000000
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help
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This option sets the base address for the uClinux kernel. The kernel
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will rearrange the SDRAM layout to start at this address, and move
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itself to start there. It must be greater than 0, and it must be
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sufficiently less than 0xE0000000 that the SDRAM does not intersect
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the I/O region.
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The base address must also be aligned such that the SDRAM controller
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can decode it. For instance, a 512MB SDRAM bank must be 512MB aligned.
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config UCPAGE_OFFSET_20000000
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bool "0x20000000"
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config UCPAGE_OFFSET_40000000
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bool "0x40000000"
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config UCPAGE_OFFSET_60000000
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bool "0x60000000"
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config UCPAGE_OFFSET_80000000
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bool "0x80000000"
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config UCPAGE_OFFSET_A0000000
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bool "0xA0000000"
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config UCPAGE_OFFSET_C0000000
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bool "0xC0000000 (Recommended)"
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endchoice
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config PAGE_OFFSET
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hex
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default 0x20000000 if UCPAGE_OFFSET_20000000
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default 0x40000000 if UCPAGE_OFFSET_40000000
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default 0x60000000 if UCPAGE_OFFSET_60000000
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default 0x80000000 if UCPAGE_OFFSET_80000000
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default 0xA0000000 if UCPAGE_OFFSET_A0000000
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default 0xC0000000
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config PROTECT_KERNEL
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bool "Protect core kernel against userspace"
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depends on !MMU
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default y
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help
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Selecting this option causes the uClinux kernel to change the
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permittivity of DAMPR register covering the core kernel image to
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prevent userspace accessing the underlying memory directly.
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choice
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prompt "CPU Caching mode"
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default FRV_DEFL_CACHE_WBACK
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help
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This option determines the default caching mode for the kernel.
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Write-Back caching mode involves the all reads and writes causing
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the affected cacheline to be read into the cache first before being
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operated upon. Memory is not then updated by a write until the cache
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is filled and a cacheline needs to be displaced from the cache to
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make room. Only at that point is it written back.
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Write-Behind caching is similar to Write-Back caching, except that a
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write won't fetch a cacheline into the cache if there isn't already
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one there; it will write directly to memory instead.
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Write-Through caching only fetches cachelines from memory on a
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read. Writes always get written directly to memory. If the affected
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cacheline is also in cache, it will be updated too.
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The final option is to turn of caching entirely.
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Note that not all CPUs support Write-Behind caching. If the CPU on
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which the kernel is running doesn't, it'll fall back to Write-Back
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caching.
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config FRV_DEFL_CACHE_WBACK
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bool "Write-Back"
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config FRV_DEFL_CACHE_WBEHIND
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bool "Write-Behind"
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config FRV_DEFL_CACHE_WTHRU
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bool "Write-Through"
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config FRV_DEFL_CACHE_DISABLED
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bool "Disabled"
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endchoice
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menu "CPU core support"
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config CPU_FR401
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bool "Include FR401 core support"
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depends on !MMU
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default y
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help
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This enables support for the FR401, FR401A and FR403 CPUs
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config CPU_FR405
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bool "Include FR405 core support"
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depends on !MMU
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default y
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help
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This enables support for the FR405 CPU
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config CPU_FR451
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bool "Include FR451 core support"
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default y
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help
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This enables support for the FR451 CPU
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config CPU_FR451_COMPILE
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bool "Specifically compile for FR451 core"
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depends on CPU_FR451 && !CPU_FR401 && !CPU_FR405 && !CPU_FR551
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default y
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help
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This causes appropriate flags to be passed to the compiler to
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optimise for the FR451 CPU
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config CPU_FR551
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bool "Include FR551 core support"
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depends on !MMU
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default y
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help
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This enables support for the FR555 CPU
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config CPU_FR551_COMPILE
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bool "Specifically compile for FR551 core"
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depends on CPU_FR551 && !CPU_FR401 && !CPU_FR405 && !CPU_FR451
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default y
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help
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This causes appropriate flags to be passed to the compiler to
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optimise for the FR555 CPU
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config FRV_L1_CACHE_SHIFT
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int
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default "5" if CPU_FR401 || CPU_FR405 || CPU_FR451
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default "6" if CPU_FR551
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endmenu
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choice
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prompt "System support"
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default MB93091_VDK
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config MB93091_VDK
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bool "MB93091 CPU board with or without motherboard"
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config MB93093_PDK
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bool "MB93093 PDK unit"
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endchoice
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if MB93091_VDK
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choice
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prompt "Motherboard support"
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default MB93090_MB00
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config MB93090_MB00
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bool "Use the MB93090-MB00 motherboard"
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help
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Select this option if the MB93091 CPU board is going to be used with
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a MB93090-MB00 VDK motherboard
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config MB93091_NO_MB
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bool "Use standalone"
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help
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Select this option if the MB93091 CPU board is going to be used
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without a motherboard
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endchoice
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endif
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config FUJITSU_MB93493
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bool "MB93493 Multimedia chip"
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help
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Select this option if the MB93493 multimedia chip is going to be
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used.
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choice
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prompt "GP-Relative data support"
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default GPREL_DATA_8
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help
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This option controls what data, if any, should be placed in the GP
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relative data sections. Using this means that the compiler can
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generate accesses to the data using GR16-relative addressing which
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is faster than absolute instructions and saves space (2 instructions
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per access).
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However, the GPREL region is limited in size because the immediate
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value used in the load and store instructions is limited to a 12-bit
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signed number.
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So if the linker starts complaining that accesses to GPREL data are
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out of range, try changing this option from the default.
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Note that modules will always be compiled with this feature disabled
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as the module data will not be in range of the GP base address.
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config GPREL_DATA_8
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bool "Put data objects of up to 8 bytes into GP-REL"
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config GPREL_DATA_4
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bool "Put data objects of up to 4 bytes into GP-REL"
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config GPREL_DATA_NONE
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bool "Don't use GP-REL"
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endchoice
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config FRV_ONCPU_SERIAL
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bool "Use on-CPU serial ports"
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select SERIAL_8250
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default y
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config PCI
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bool "Use PCI"
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depends on MB93090_MB00
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default y
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help
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Some FR-V systems (such as the MB93090-MB00 VDK) have PCI
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onboard. If you have one of these boards and you wish to use the PCI
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facilities, say Y here.
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config RESERVE_DMA_COHERENT
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bool "Reserve DMA coherent memory"
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depends on PCI && !MMU
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default y
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help
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Many PCI drivers require access to uncached memory for DMA device
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communications (such as is done with some Ethernet buffer rings). If
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a fully featured MMU is available, this can be done through page
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table settings, but if not, a region has to be set aside and marked
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with a special DAMPR register.
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Setting this option causes uClinux to set aside a portion of the
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available memory for use in this manner. The memory will then be
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unavailable for normal kernel use.
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source "drivers/pci/Kconfig"
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source "drivers/pcmcia/Kconfig"
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#config MATH_EMULATION
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# bool "Math emulation support (EXPERIMENTAL)"
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# depends on EXPERIMENTAL
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# help
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# At some point in the future, this will cause floating-point math
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# instructions to be emulated by the kernel on machines that lack a
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# floating-point math coprocessor. Thrill-seekers and chronically
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# sleep-deprived psychotic hacker types can say Y now, everyone else
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# should probably wait a while.
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menu "Power management options"
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config ARCH_SUSPEND_POSSIBLE
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def_bool y
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depends on !SMP
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source kernel/power/Kconfig
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endmenu
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endmenu
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menu "Executable formats"
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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/frv/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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