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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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12700c17fc
There are many different ways that access_ok() is defined across architectures, but in the end, they all just compare against the user_addr_max() value or they accept anything. Provide one definition that works for most architectures, checking against TASK_SIZE_MAX for user processes or skipping the check inside of uaccess_kernel() sections. For architectures without CONFIG_SET_FS(), this should be the fastest check, as it comes down to a single comparison of a pointer against a compile-time constant, while the architecture specific versions tend to do something more complex for historic reasons or get something wrong. Type checking for __user annotations is handled inconsistently across architectures, but this is easily simplified as well by using an inline function that takes a 'const void __user *' argument. A handful of callers need an extra __user annotation for this. Some architectures had trick to use 33-bit or 65-bit arithmetic on the addresses to calculate the overflow, however this simpler version uses fewer registers, which means it can produce better object code in the end despite needing a second (statically predicted) branch. Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Mark Rutland <mark.rutland@arm.com> [arm64, asm-generic] Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Stafford Horne <shorne@gmail.com> Acked-by: Dinh Nguyen <dinguyen@kernel.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
542 lines
14 KiB
Text
542 lines
14 KiB
Text
# SPDX-License-Identifier: GPL-2.0
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comment "Processor Type"
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choice
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prompt "CPU family support"
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default M68KCLASSIC if MMU
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default COLDFIRE if !MMU
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help
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The Freescale (was Motorola) M68K family of processors implements
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the full 68000 processor instruction set.
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The Freescale ColdFire family of processors is a modern derivative
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of the 68000 processor family. They are mainly targeted at embedded
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applications, and are all System-On-Chip (SOC) devices, as opposed
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to stand alone CPUs. They implement a subset of the original 68000
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processor instruction set.
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If you anticipate running this kernel on a computer with a classic
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MC68xxx processor, select M68KCLASSIC.
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If you anticipate running this kernel on a computer with a ColdFire
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processor, select COLDFIRE.
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config M68KCLASSIC
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bool "Classic M68K CPU family support"
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select HAVE_ARCH_PFN_VALID
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config COLDFIRE
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bool "Coldfire CPU family support"
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select ARCH_HAVE_CUSTOM_GPIO_H
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select CPU_HAS_NO_BITFIELDS
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select CPU_HAS_NO_CAS
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select CPU_HAS_NO_MULDIV64
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select GENERIC_CSUM
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select GPIOLIB
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select HAVE_LEGACY_CLK
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endchoice
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if M68KCLASSIC
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config M68000
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bool
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depends on !MMU
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select CPU_HAS_NO_BITFIELDS
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select CPU_HAS_NO_CAS
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select CPU_HAS_NO_MULDIV64
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select CPU_HAS_NO_UNALIGNED
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select GENERIC_CSUM
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select CPU_NO_EFFICIENT_FFS
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select HAVE_ARCH_HASH
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help
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The Freescale (was Motorola) 68000 CPU is the first generation of
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the well known M68K family of processors. The CPU core as well as
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being available as a stand alone CPU was also used in many
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System-On-Chip devices (eg 68328, 68302, etc). It does not contain
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a paging MMU.
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config M68020
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bool "68020 support"
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depends on MMU
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select FPU
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select CPU_HAS_ADDRESS_SPACES
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help
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If you anticipate running this kernel on a computer with a MC68020
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processor, say Y. Otherwise, say N. Note that the 68020 requires a
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68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
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Sun 3, which provides its own version.
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config M68030
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bool "68030 support"
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depends on MMU && !MMU_SUN3
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select FPU
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select CPU_HAS_ADDRESS_SPACES
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help
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If you anticipate running this kernel on a computer with a MC68030
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processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
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work, as it does not include an MMU (Memory Management Unit).
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config M68040
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bool "68040 support"
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depends on MMU && !MMU_SUN3
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select FPU
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select CPU_HAS_ADDRESS_SPACES
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help
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If you anticipate running this kernel on a computer with a MC68LC040
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or MC68040 processor, say Y. Otherwise, say N. Note that an
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MC68EC040 will not work, as it does not include an MMU (Memory
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Management Unit).
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config M68060
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bool "68060 support"
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depends on MMU && !MMU_SUN3
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select FPU
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select CPU_HAS_ADDRESS_SPACES
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help
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If you anticipate running this kernel on a computer with a MC68060
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processor, say Y. Otherwise, say N.
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config M68328
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bool
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depends on !MMU
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select LEGACY_TIMER_TICK
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select M68000
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help
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Motorola 68328 processor support.
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config M68EZ328
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bool
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depends on !MMU
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select LEGACY_TIMER_TICK
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select M68000
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help
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Motorola 68EX328 processor support.
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config M68VZ328
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bool
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depends on !MMU
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select LEGACY_TIMER_TICK
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select M68000
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help
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Motorola 68VZ328 processor support.
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endif # M68KCLASSIC
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if COLDFIRE
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choice
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prompt "ColdFire SoC type"
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default M520x
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help
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Select the type of ColdFire System-on-Chip (SoC) that you want
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to build for.
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config M5206
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bool "MCF5206"
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depends on !MMU
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select COLDFIRE_SW_A7
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select COLDFIRE_TIMERS
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select HAVE_MBAR
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select CPU_NO_EFFICIENT_FFS
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help
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Motorola ColdFire 5206 processor support.
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config M5206e
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bool "MCF5206e"
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depends on !MMU
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select COLDFIRE_SW_A7
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select COLDFIRE_TIMERS
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select HAVE_MBAR
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select CPU_NO_EFFICIENT_FFS
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help
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Motorola ColdFire 5206e processor support.
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config M520x
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bool "MCF520x"
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depends on !MMU
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select COLDFIRE_PIT_TIMER
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select HAVE_CACHE_SPLIT
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help
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Freescale Coldfire 5207/5208 processor support.
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config M523x
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bool "MCF523x"
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depends on !MMU
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select COLDFIRE_PIT_TIMER
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select HAVE_CACHE_SPLIT
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select HAVE_IPSBAR
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help
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Freescale Coldfire 5230/1/2/4/5 processor support
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config M5249
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bool "MCF5249"
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depends on !MMU
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select COLDFIRE_SW_A7
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select COLDFIRE_TIMERS
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select HAVE_MBAR
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select CPU_NO_EFFICIENT_FFS
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help
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Motorola ColdFire 5249 processor support.
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config M525x
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bool "MCF525x"
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depends on !MMU
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select COLDFIRE_SW_A7
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select COLDFIRE_TIMERS
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select HAVE_MBAR
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select CPU_NO_EFFICIENT_FFS
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help
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Freescale (Motorola) Coldfire 5251/5253 processor support.
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config M5271
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bool "MCF5271"
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depends on !MMU
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select COLDFIRE_PIT_TIMER
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select M527x
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select HAVE_CACHE_SPLIT
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select HAVE_IPSBAR
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help
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Freescale (Motorola) ColdFire 5270/5271 processor support.
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config M5272
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bool "MCF5272"
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depends on !MMU
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select COLDFIRE_SW_A7
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select COLDFIRE_TIMERS
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select HAVE_MBAR
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select CPU_NO_EFFICIENT_FFS
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help
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Motorola ColdFire 5272 processor support.
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config M5275
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bool "MCF5275"
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depends on !MMU
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select COLDFIRE_PIT_TIMER
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select M527x
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select HAVE_CACHE_SPLIT
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select HAVE_IPSBAR
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help
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Freescale (Motorola) ColdFire 5274/5275 processor support.
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config M528x
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bool "MCF528x"
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depends on !MMU
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select COLDFIRE_PIT_TIMER
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select HAVE_CACHE_SPLIT
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select HAVE_IPSBAR
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help
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Motorola ColdFire 5280/5282 processor support.
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config M5307
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bool "MCF5307"
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depends on !MMU
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select COLDFIRE_TIMERS
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select COLDFIRE_SW_A7
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select HAVE_CACHE_CB
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select HAVE_MBAR
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select CPU_NO_EFFICIENT_FFS
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help
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Motorola ColdFire 5307 processor support.
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config M532x
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bool "MCF532x"
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depends on !MMU
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select COLDFIRE_TIMERS
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select M53xx
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select HAVE_CACHE_CB
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help
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Freescale (Motorola) ColdFire 532x processor support.
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config M537x
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bool "MCF537x"
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depends on !MMU
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select COLDFIRE_TIMERS
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select M53xx
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select HAVE_CACHE_CB
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help
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Freescale ColdFire 537x processor support.
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config M5407
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bool "MCF5407"
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depends on !MMU
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select COLDFIRE_SW_A7
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select COLDFIRE_TIMERS
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select HAVE_CACHE_CB
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select HAVE_MBAR
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select CPU_NO_EFFICIENT_FFS
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help
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Motorola ColdFire 5407 processor support.
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config M547x
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bool "MCF547x"
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select M54xx
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select COLDFIRE_SLTIMERS
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select MMU_COLDFIRE if MMU
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select FPU if MMU
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select HAVE_CACHE_CB
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select HAVE_MBAR
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select CPU_NO_EFFICIENT_FFS
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help
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Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
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config M548x
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bool "MCF548x"
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select COLDFIRE_SLTIMERS
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select MMU_COLDFIRE if MMU
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select FPU if MMU
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select M54xx
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select HAVE_CACHE_CB
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select HAVE_MBAR
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select CPU_NO_EFFICIENT_FFS
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help
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Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
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config M5441x
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bool "MCF5441x"
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select COLDFIRE_PIT_TIMER
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select MMU_COLDFIRE if MMU
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select HAVE_CACHE_CB
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help
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Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
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endchoice
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config M527x
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bool
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config M53xx
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bool
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config M54xx
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select HAVE_PCI
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bool
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config COLDFIRE_PIT_TIMER
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bool
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config COLDFIRE_TIMERS
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bool
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select LEGACY_TIMER_TICK
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config COLDFIRE_SLTIMERS
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bool
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select LEGACY_TIMER_TICK
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endif # COLDFIRE
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comment "Processor Specific Options"
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config M68KFPU_EMU
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bool "Math emulation support"
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depends on MMU
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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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config M68KFPU_EMU_EXTRAPREC
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bool "Math emulation extra precision"
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depends on M68KFPU_EMU
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help
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The fpu uses normally a few bit more during calculations for
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correct rounding, the emulator can (often) do the same but this
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extra calculation can cost quite some time, so you can disable
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it here. The emulator will then "only" calculate with a 64 bit
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mantissa and round slightly incorrect, what is more than enough
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for normal usage.
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config M68KFPU_EMU_ONLY
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bool "Math emulation only kernel"
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depends on M68KFPU_EMU
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help
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This option prevents any floating-point instructions from being
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compiled into the kernel, thereby the kernel doesn't save any
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floating point context anymore during task switches, so this
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kernel will only be usable on machines without a floating-point
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math coprocessor. This makes the kernel a bit faster as no tests
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needs to be executed whether a floating-point instruction in the
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kernel should be executed or not.
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config ADVANCED
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bool "Advanced configuration options"
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depends on MMU
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help
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This gives you access to some advanced options for the CPU. The
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defaults should be fine for most users, but these options may make
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it possible for you to improve performance somewhat if you know what
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you are doing.
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Note that the answer to this question won't directly affect the
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kernel: saying N will just cause the configurator to skip all
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the questions about these options.
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Most users should say N to this question.
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config RMW_INSNS
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bool "Use read-modify-write instructions"
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depends on ADVANCED && !CPU_HAS_NO_CAS
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help
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This allows to use certain instructions that work with indivisible
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read-modify-write bus cycles. While this is faster than the
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workaround of disabling interrupts, it can conflict with DMA
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( = direct memory access) on many Amiga systems, and it is also said
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to destabilize other machines. It is very likely that this will
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cause serious problems on any Amiga or Atari Medusa if set. The only
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configuration where it should work are 68030-based Ataris, where it
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apparently improves performance. But you've been warned! Unless you
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really know what you are doing, say N. Try Y only if you're quite
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adventurous.
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config SINGLE_MEMORY_CHUNK
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bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
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depends on MMU
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default y if SUN3 || MMU_COLDFIRE
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help
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Ignore all but the first contiguous chunk of physical memory for VM
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purposes. This will save a few bytes kernel size and may speed up
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some operations.
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When this option os set to N, you may want to lower "Maximum zone
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order" to save memory that could be wasted for unused memory map.
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Say N if not sure.
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config FORCE_MAX_ZONEORDER
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int "Maximum zone order" if ADVANCED
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depends on !SINGLE_MEMORY_CHUNK
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default "11"
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help
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The kernel memory allocator divides physically contiguous memory
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blocks into "zones", where each zone is a power of two number of
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pages. This option selects the largest power of two that the kernel
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keeps in the memory allocator. If you need to allocate very large
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blocks of physically contiguous memory, then you may need to
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increase this value.
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For systems that have holes in their physical address space this
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value also defines the minimal size of the hole that allows
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freeing unused memory map.
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This config option is actually maximum order plus one. For example,
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a value of 11 means that the largest free memory block is 2^10 pages.
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config 060_WRITETHROUGH
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bool "Use write-through caching for 68060 supervisor accesses"
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depends on ADVANCED && M68060
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help
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The 68060 generally uses copyback caching of recently accessed data.
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Copyback caching means that memory writes will be held in an on-chip
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cache and only written back to memory some time later. Saying Y
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here will force supervisor (kernel) accesses to use writethrough
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caching. Writethrough caching means that data is written to memory
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straight away, so that cache and memory data always agree.
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Writethrough caching is less efficient, but is needed for some
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drivers on 68060 based systems where the 68060 bus snooping signal
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is hardwired on. The 53c710 SCSI driver is known to suffer from
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this problem.
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config M68K_L2_CACHE
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bool
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depends on MAC
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default y
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config CPU_HAS_NO_BITFIELDS
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bool
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config CPU_HAS_NO_CAS
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bool
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config CPU_HAS_NO_MULDIV64
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bool
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config CPU_HAS_NO_UNALIGNED
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bool
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config CPU_HAS_ADDRESS_SPACES
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bool
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select ALTERNATE_USER_ADDRESS_SPACE
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config FPU
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bool
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config COLDFIRE_SW_A7
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bool
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config HAVE_CACHE_SPLIT
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bool
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config HAVE_CACHE_CB
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bool
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config HAVE_MBAR
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bool
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config HAVE_IPSBAR
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bool
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config CLOCK_FREQ
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int "Set the core clock frequency"
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default "25000000" if M5206
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default "54000000" if M5206e
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default "166666666" if M520x
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default "140000000" if M5249
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default "150000000" if M527x || M523x
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default "90000000" if M5307
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default "50000000" if M5407
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default "266000000" if M54xx
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default "66666666"
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depends on COLDFIRE
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help
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Define the CPU clock frequency in use. This is the core clock
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frequency, it may or may not be the same as the external clock
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crystal fitted to your board. Some processors have an internal
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PLL and can have their frequency programmed at run time, others
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use internal dividers. In general the kernel won't setup a PLL
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if it is fitted (there are some exceptions). This value will be
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specific to the exact CPU that you are using.
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config OLDMASK
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bool "Old mask 5307 (1H55J) silicon"
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depends on M5307
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help
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Build support for the older revision ColdFire 5307 silicon.
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Specifically this is the 1H55J mask revision.
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if HAVE_CACHE_SPLIT
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choice
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prompt "Split Cache Configuration"
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default CACHE_I
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config CACHE_I
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bool "Instruction"
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help
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Use all of the ColdFire CPU cache memory as an instruction cache.
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config CACHE_D
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bool "Data"
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help
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Use all of the ColdFire CPU cache memory as a data cache.
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config CACHE_BOTH
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bool "Both"
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help
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Split the ColdFire CPU cache, and use half as an instruction cache
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and half as a data cache.
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endchoice
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endif
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if HAVE_CACHE_CB
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choice
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prompt "Data cache mode"
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default CACHE_WRITETHRU
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config CACHE_WRITETHRU
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bool "Write-through"
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help
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The ColdFire CPU cache is set into Write-through mode.
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config CACHE_COPYBACK
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bool "Copy-back"
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|
help
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|
The ColdFire CPU cache is set into Copy-back mode.
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endchoice
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endif
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