kconfig

linux 内核源代码

#
# Processor families
#
config CPU_SH2
	bool

config CPU_SH2A
	bool
	select CPU_SH2

config CPU_SH3
	bool
	select CPU_HAS_INTEVT
	select CPU_HAS_SR_RB

config CPU_SH4
	bool
	select CPU_HAS_INTEVT
	select CPU_HAS_SR_RB
	select CPU_HAS_PTEA if !CPU_SH4A || CPU_SHX2
	select CPU_HAS_FPU if !CPU_SH4AL_DSP

config CPU_SH4A
	bool
	select CPU_SH4

config CPU_SH4AL_DSP
	bool
	select CPU_SH4A
	select CPU_HAS_DSP

config CPU_SHX2
	bool

config CPU_SHX3
	bool

choice
	prompt "Processor sub-type selection"

#
# Processor subtypes
#

# SH-2 Processor Support

config CPU_SUBTYPE_SH7619
	bool "Support SH7619 processor"
	select CPU_SH2

# SH-2A Processor Support

config CPU_SUBTYPE_SH7206
	bool "Support SH7206 processor"
	select CPU_SH2A

# SH-3 Processor Support

config CPU_SUBTYPE_SH7705
	bool "Support SH7705 processor"
	select CPU_SH3

config CPU_SUBTYPE_SH7706
	bool "Support SH7706 processor"
	select CPU_SH3
	help
	  Select SH7706 if you have a 133 Mhz SH-3 HD6417706 CPU.

config CPU_SUBTYPE_SH7707
	bool "Support SH7707 processor"
	select CPU_SH3
	help
	  Select SH7707 if you have a  60 Mhz SH-3 HD6417707 CPU.

config CPU_SUBTYPE_SH7708
	bool "Support SH7708 processor"
	select CPU_SH3
	help
	  Select SH7708 if you have a  60 Mhz SH-3 HD6417708S or
	  if you have a 100 Mhz SH-3 HD6417708R CPU.

config CPU_SUBTYPE_SH7709
	bool "Support SH7709 processor"
	select CPU_SH3
	help
	  Select SH7709 if you have a  80 Mhz SH-3 HD6417709 CPU.

config CPU_SUBTYPE_SH7710
	bool "Support SH7710 processor"
	select CPU_SH3
	select CPU_HAS_DSP
	help
	  Select SH7710 if you have a SH3-DSP SH7710 CPU.

config CPU_SUBTYPE_SH7712
	bool "Support SH7712 processor"
	select CPU_SH3
	select CPU_HAS_DSP
	help
	  Select SH7712 if you have a SH3-DSP SH7712 CPU.

config CPU_SUBTYPE_SH7720
	bool "Support SH7720 processor"
	select CPU_SH3
	select CPU_HAS_DSP
	help
	  Select SH7720 if you have a SH3-DSP SH7720 CPU.

# SH-4 Processor Support

config CPU_SUBTYPE_SH7750
	bool "Support SH7750 processor"
	select CPU_SH4
	help
	  Select SH7750 if you have a 200 Mhz SH-4 HD6417750 CPU.

config CPU_SUBTYPE_SH7091
	bool "Support SH7091 processor"
	select CPU_SH4
	help
	  Select SH7091 if you have an SH-4 based Sega device (such as
	  the Dreamcast, Naomi, and Naomi 2).

config CPU_SUBTYPE_SH7750R
	bool "Support SH7750R processor"
	select CPU_SH4

config CPU_SUBTYPE_SH7750S
	bool "Support SH7750S processor"
	select CPU_SH4

config CPU_SUBTYPE_SH7751
	bool "Support SH7751 processor"
	select CPU_SH4
	help
	  Select SH7751 if you have a 166 Mhz SH-4 HD6417751 CPU,
	  or if you have a HD6417751R CPU.

config CPU_SUBTYPE_SH7751R
	bool "Support SH7751R processor"
	select CPU_SH4

config CPU_SUBTYPE_SH7760
	bool "Support SH7760 processor"
	select CPU_SH4

config CPU_SUBTYPE_SH4_202
	bool "Support SH4-202 processor"
	select CPU_SH4

# SH-4A Processor Support

config CPU_SUBTYPE_SH7770
	bool "Support SH7770 processor"
	select CPU_SH4A

config CPU_SUBTYPE_SH7780
	bool "Support SH7780 processor"
	select CPU_SH4A

config CPU_SUBTYPE_SH7785
	bool "Support SH7785 processor"
	select CPU_SH4A
	select CPU_SHX2
	select ARCH_SPARSEMEM_ENABLE
	select SYS_SUPPORTS_NUMA

config CPU_SUBTYPE_SHX3
	bool "Support SH-X3 processor"
	select CPU_SH4A
	select CPU_SHX3
	select ARCH_SPARSEMEM_ENABLE
	select SYS_SUPPORTS_NUMA
	select SYS_SUPPORTS_SMP

# SH4AL-DSP Processor Support

config CPU_SUBTYPE_SH7343
	bool "Support SH7343 processor"
	select CPU_SH4AL_DSP

config CPU_SUBTYPE_SH7722
	bool "Support SH7722 processor"
	select CPU_SH4AL_DSP
	select CPU_SHX2
	select ARCH_SPARSEMEM_ENABLE
	select SYS_SUPPORTS_NUMA

endchoice

menu "Memory management options"

config QUICKLIST
	def_bool y

config MMU
        bool "Support for memory management hardware"
	depends on !CPU_SH2
	default y
	help
	  Some SH processors (such as SH-2/SH-2A) lack an MMU. In order to
	  boot on these systems, this option must not be set.

	  On other systems (such as the SH-3 and 4) where an MMU exists,
	  turning this off will boot the kernel on these machines with the
	  MMU implicitly switched off.

config PAGE_OFFSET
	hex
	default "0x80000000" if MMU
	default "0x00000000"

config MEMORY_START
	hex "Physical memory start address"
	default "0x08000000"
	---help---
	  Computers built with Hitachi SuperH processors always
	  map the ROM starting at address zero.  But the processor
	  does not specify the range that RAM takes.

	  The physical memory (RAM) start address will be automatically
	  set to 08000000. Other platforms, such as the Solution Engine
	  boards typically map RAM at 0C000000.

	  Tweak this only when porting to a new machine which does not
	  already have a defconfig. Changing it from the known correct
	  value on any of the known systems will only lead to disaster.

config MEMORY_SIZE
	hex "Physical memory size"
	default "0x00400000"
	help
	  This sets the default memory size assumed by your SH kernel. It can
	  be overridden as normal by the 'mem=' argument on the kernel command
	  line. If unsure, consult your board specifications or just leave it
	  as 0x00400000 which was the default value before this became
	  configurable.

config 32BIT
	bool "Support 32-bit physical addressing through PMB"
	depends on MMU && (CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785)
	default y
	help
	  If you say Y here, physical addressing will be extended to
	  32-bits through the SH-4A PMB. If this is not set, legacy
	  29-bit physical addressing will be used.

config X2TLB
	bool "Enable extended TLB mode"
	depends on (CPU_SHX2 || CPU_SHX3) && MMU && EXPERIMENTAL
	help
	  Selecting this option will enable the extended mode of the SH-X2
	  TLB. For legacy SH-X behaviour and interoperability, say N. For
	  all of the fun new features and a willingless to submit bug reports,
	  say Y.

config VSYSCALL
	bool "Support vsyscall page"
	depends on MMU
	default y
	help
	  This will enable support for the kernel mapping a vDSO page
	  in process space, and subsequently handing down the entry point
	  to the libc through the ELF auxiliary vector.

	  From the kernel side this is used for the signal trampoline.
	  For systems with an MMU that can afford to give up a page,
	  (the default value) say Y.

config NUMA
	bool "Non Uniform Memory Access (NUMA) Support"
	depends on MMU && SYS_SUPPORTS_NUMA && EXPERIMENTAL
	default n
	help
	  Some SH systems have many various memories scattered around
	  the address space, each with varying latencies. This enables
	  support for these blocks by binding them to nodes and allowing
	  memory policies to be used for prioritizing and controlling
	  allocation behaviour.

config NODES_SHIFT
	int
	default "3" if CPU_SUBTYPE_SHX3
	default "1"
	depends on NEED_MULTIPLE_NODES

config ARCH_FLATMEM_ENABLE
	def_bool y
	depends on !NUMA

config ARCH_SPARSEMEM_ENABLE
	def_bool y
	select SPARSEMEM_STATIC

config ARCH_SPARSEMEM_DEFAULT
	def_bool y

config MAX_ACTIVE_REGIONS
	int
	default "6" if (CPU_SUBTYPE_SHX3 && SPARSEMEM)
	default "2" if SPARSEMEM && (CPU_SUBTYPE_SH7722 || \
		       CPU_SUBTYPE_SH7785)
	default "1"

config ARCH_POPULATES_NODE_MAP
	def_bool y

config ARCH_SELECT_MEMORY_MODEL
	def_bool y

config ARCH_ENABLE_MEMORY_HOTPLUG
	def_bool y
	depends on SPARSEMEM

config ARCH_MEMORY_PROBE
	def_bool y
	depends on MEMORY_HOTPLUG

choice
	prompt "Kernel page size"
	default PAGE_SIZE_8KB if X2TLB
	default PAGE_SIZE_4KB

config PAGE_SIZE_4KB
	bool "4kB"
	depends on !X2TLB
	help
	  This is the default page size used by all SuperH CPUs.

config PAGE_SIZE_8KB
	bool "8kB"
	depends on X2TLB
	help
	  This enables 8kB pages as supported by SH-X2 and later MMUs.

config PAGE_SIZE_64KB
	bool "64kB"
	depends on CPU_SH4
	help
	  This enables support for 64kB pages, possible on all SH-4
	  CPUs and later.

endchoice

choice
	prompt "HugeTLB page size"
	depends on HUGETLB_PAGE && CPU_SH4 && MMU
	default HUGETLB_PAGE_SIZE_64K

config HUGETLB_PAGE_SIZE_64K
	bool "64kB"

config HUGETLB_PAGE_SIZE_256K
	bool "256kB"
	depends on X2TLB

config HUGETLB_PAGE_SIZE_1MB
	bool "1MB"

config HUGETLB_PAGE_SIZE_4MB
	bool "4MB"
	depends on X2TLB

config HUGETLB_PAGE_SIZE_64MB
	bool "64MB"
	depends on X2TLB

endchoice

source "mm/Kconfig"

endmenu

menu "Cache configuration"

config SH7705_CACHE_32KB
	bool "Enable 32KB cache size for SH7705"
	depends on CPU_SUBTYPE_SH7705
	default y

config SH_DIRECT_MAPPED
	bool "Use direct-mapped caching"
	default n
	help
	  Selecting this option will configure the caches to be direct-mapped,
	  even if the cache supports a 2 or 4-way mode. This is useful primarily
	  for debugging on platforms with 2 and 4-way caches (SH7750R/SH7751R,
	  SH4-202, SH4-501, etc.)

	  Turn this option off for platforms that do not have a direct-mapped
	  cache, and you have no need to run the caches in such a configuration.

choice
	prompt "Cache mode"
	default CACHE_WRITEBACK if CPU_SH2A || CPU_SH3 || CPU_SH4
	default CACHE_WRITETHROUGH if (CPU_SH2 && !CPU_SH2A)

config CACHE_WRITEBACK
	bool "Write-back"
	depends on CPU_SH2A || CPU_SH3 || CPU_SH4

config CACHE_WRITETHROUGH
	bool "Write-through"
	help
	  Selecting this option will configure the caches in write-through
	  mode, as opposed to the default write-back configuration.

	  Since there's sill some aliasing issues on SH-4, this option will
	  unfortunately still require the majority of flushing functions to
	  be implemented to deal with aliasing.

	  If unsure, say N.

config CACHE_OFF
	bool "Off"

endchoice

endmenu