arch/microblaze/Kconfig - third_party/linux - Git at Google

 # SPDX-License-Identifier: GPL-2.0-only
 config MICROBLAZE
 	def_bool y
 	select ARCH_32BIT_OFF_T
 	select ARCH_NO_SWAP
 	select ARCH_HAS_BINFMT_FLAT if !MMU
 	select ARCH_HAS_DMA_PREP_COHERENT
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_SYNC_DMA_FOR_CPU
 	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
 	select ARCH_HAS_DMA_SET_UNCACHED if !MMU
 	select ARCH_MIGHT_HAVE_PC_PARPORT
 	select ARCH_WANT_IPC_PARSE_VERSION
 	select BUILDTIME_EXTABLE_SORT
 	select TIMER_OF
 	select CLONE_BACKWARDS3
 	select COMMON_CLK
 	select DMA_DIRECT_REMAP if MMU
 	select GENERIC_ATOMIC64
 	select GENERIC_CLOCKEVENTS
 	select GENERIC_CPU_DEVICES
 	select GENERIC_IDLE_POLL_SETUP
 	select GENERIC_IRQ_PROBE
 	select GENERIC_IRQ_SHOW
 	select GENERIC_PCI_IOMAP
 	select GENERIC_SCHED_CLOCK
 	select HAVE_ARCH_HASH
 	select HAVE_ARCH_KGDB
 	select HAVE_DEBUG_KMEMLEAK
 	select HAVE_DYNAMIC_FTRACE
 	select HAVE_FTRACE_MCOUNT_RECORD
 	select HAVE_FUNCTION_GRAPH_TRACER
 	select HAVE_FUNCTION_TRACER
 	select HAVE_MEMBLOCK_NODE_MAP
 	select HAVE_OPROFILE
 	select HAVE_PCI
 	select IRQ_DOMAIN
 	select XILINX_INTC
 	select MODULES_USE_ELF_RELA
 	select OF
 	select OF_EARLY_FLATTREE
 	select PCI_DOMAINS_GENERIC if PCI
 	select PCI_SYSCALL if PCI
 	select TRACING_SUPPORT
 	select VIRT_TO_BUS
 	select CPU_NO_EFFICIENT_FFS
 	select MMU_GATHER_NO_RANGE if MMU

 # Endianness selection
 choice
 	prompt "Endianness selection"
 	default CPU_LITTLE_ENDIAN
 	help
 	  microblaze architectures can be configured for either little or
 	  big endian formats. Be sure to select the appropriate mode.

 config CPU_BIG_ENDIAN
 	bool "Big endian"

 config CPU_LITTLE_ENDIAN
 	bool "Little endian"

 endchoice

 config ZONE_DMA
 	def_bool y

 config ARCH_HAS_ILOG2_U32
 	def_bool n

 config ARCH_HAS_ILOG2_U64
 	def_bool n

 config GENERIC_HWEIGHT
 	def_bool y

 config GENERIC_CALIBRATE_DELAY
 	def_bool y

 config GENERIC_CSUM
 	def_bool y

 config STACKTRACE_SUPPORT
 	def_bool y

 config LOCKDEP_SUPPORT
 	def_bool y

 source "arch/microblaze/Kconfig.platform"

 menu "Processor type and features"

 source "kernel/Kconfig.hz"

 config MMU
 	bool "MMU support"
 	default n

 comment "Boot options"

 config CMDLINE_BOOL
 	bool "Default bootloader kernel arguments"

 config CMDLINE
 	string "Default kernel command string"
 	depends on CMDLINE_BOOL
 	default "console=ttyUL0,115200"
 	help
 	  On some architectures there is currently no way for the boot loader
 	  to pass arguments to the kernel. For these architectures, you should
 	  supply some command-line options at build time by entering them
 	  here.

 config CMDLINE_FORCE
 	bool "Force default kernel command string"
 	depends on CMDLINE_BOOL
 	default n
 	help
 	  Set this to have arguments from the default kernel command string
 	  override those passed by the boot loader.

 config SECCOMP
 	bool "Enable seccomp to safely compute untrusted bytecode"
 	depends on PROC_FS
 	default y
 	help
 	  This kernel feature is useful for number crunching applications
 	  that may need to compute untrusted bytecode during their
 	  execution. By using pipes or other transports made available to
 	  the process as file descriptors supporting the read/write
 	  syscalls, it's possible to isolate those applications in
 	  their own address space using seccomp. Once seccomp is
 	  enabled via /proc/<pid>/seccomp, it cannot be disabled
 	  and the task is only allowed to execute a few safe syscalls
 	  defined by each seccomp mode.

 	  If unsure, say Y. Only embedded should say N here.

 endmenu

 menu "Kernel features"

 config NR_CPUS
 	int
 	default "1"

 config ADVANCED_OPTIONS
 	bool "Prompt for advanced kernel configuration options"
 	help
 	  This option will enable prompting for a variety of advanced kernel
 	  configuration options.  These options can cause the kernel to not
 	  work if they are set incorrectly, but can be used to optimize certain
 	  aspects of kernel memory management.

 	  Unless you know what you are doing, say N here.

 comment "Default settings for advanced configuration options are used"
 	depends on !ADVANCED_OPTIONS

 config XILINX_UNCACHED_SHADOW
 	bool "Are you using uncached shadow for RAM ?"
 	depends on ADVANCED_OPTIONS && !MMU
 	default n
 	help
 	  This is needed to be able to allocate uncachable memory regions.
 	  The feature requires the design to define the RAM memory controller
 	  window to be twice as large as the actual physical memory.

 config HIGHMEM
 	bool "High memory support"
 	depends on MMU
 	help
 	  The address space of Microblaze processors is only 4 Gigabytes large
 	  and it has to accommodate user address space, kernel address
 	  space as well as some memory mapped IO. That means that, if you
 	  have a large amount of physical memory and/or IO, not all of the
 	  memory can be "permanently mapped" by the kernel. The physical
 	  memory that is not permanently mapped is called "high memory".

 	  If unsure, say n.

 config LOWMEM_SIZE_BOOL
 	bool "Set maximum low memory"
 	depends on ADVANCED_OPTIONS && MMU
 	help
 	  This option allows you to set the maximum amount of memory which
 	  will be used as "low memory", that is, memory which the kernel can
 	  access directly, without having to set up a kernel virtual mapping.
 	  This can be useful in optimizing the layout of kernel virtual
 	  memory.

 	  Say N here unless you know what you are doing.

 config LOWMEM_SIZE
 	hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 	default "0x30000000"

 config MANUAL_RESET_VECTOR
 	hex "Microblaze reset vector address setup"
 	default "0x0"
 	help
 	  Set this option to have the kernel override the CPU Reset vector.
 	  If zero, no change will be made to the MicroBlaze reset vector at
 	  address 0x0.
 	  If non-zero, a jump instruction to this address, will be written
 	  to the reset vector at address 0x0.
 	  If you are unsure, set it to default value 0x0.

 config KERNEL_START_BOOL
 	bool "Set custom kernel base address"
 	depends on ADVANCED_OPTIONS
 	help
 	  This option allows you to set the kernel virtual address at which
 	  the kernel will map low memory (the kernel image will be linked at
 	  this address).  This can be useful in optimizing the virtual memory
 	  layout of the system.

 	  Say N here unless you know what you are doing.

 config KERNEL_START
 	hex "Virtual address of kernel base" if KERNEL_START_BOOL
 	default "0xc0000000" if MMU
 	default KERNEL_BASE_ADDR if !MMU

 config TASK_SIZE_BOOL
 	bool "Set custom user task size"
 	depends on ADVANCED_OPTIONS && MMU
 	help
 	  This option allows you to set the amount of virtual address space
 	  allocated to user tasks.  This can be useful in optimizing the
 	  virtual memory layout of the system.

 	  Say N here unless you know what you are doing.

 config TASK_SIZE
 	hex "Size of user task space" if TASK_SIZE_BOOL
 	default "0x80000000"

 choice
 	prompt "Page size"
 	default MICROBLAZE_4K_PAGES
 	depends on ADVANCED_OPTIONS && !MMU
 	help
 	  Select the kernel logical page size. Increasing the page size
 	  will reduce software overhead at each page boundary, allow
 	  hardware prefetch mechanisms to be more effective, and allow
 	  larger dma transfers increasing IO efficiency and reducing
 	  overhead. However the utilization of memory will increase.
 	  For example, each cached file will using a multiple of the
 	  page size to hold its contents and the difference between the
 	  end of file and the end of page is wasted.

 	  If unsure, choose 4K_PAGES.

 config MICROBLAZE_4K_PAGES
 	bool "4k page size"

 config MICROBLAZE_16K_PAGES
 	bool "16k page size"

 config MICROBLAZE_64K_PAGES
 	bool "64k page size"

 endchoice

 endmenu

 menu "Bus Options"

 config PCI_XILINX
 	bool "Xilinx PCI host bridge support"
 	depends on PCI

 endmenu
	# SPDX-License-Identifier: GPL-2.0-only
	config MICROBLAZE
	def_bool y
	select ARCH_32BIT_OFF_T
	select ARCH_NO_SWAP
	select ARCH_HAS_BINFMT_FLAT if !MMU
	select ARCH_HAS_DMA_PREP_COHERENT
	select ARCH_HAS_GCOV_PROFILE_ALL
	select ARCH_HAS_SYNC_DMA_FOR_CPU
	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
	select ARCH_HAS_DMA_SET_UNCACHED if !MMU
	select ARCH_MIGHT_HAVE_PC_PARPORT
	select ARCH_WANT_IPC_PARSE_VERSION
	select BUILDTIME_EXTABLE_SORT
	select TIMER_OF
	select CLONE_BACKWARDS3
	select COMMON_CLK
	select DMA_DIRECT_REMAP if MMU
	select GENERIC_ATOMIC64
	select GENERIC_CLOCKEVENTS
	select GENERIC_CPU_DEVICES
	select GENERIC_IDLE_POLL_SETUP
	select GENERIC_IRQ_PROBE
	select GENERIC_IRQ_SHOW
	select GENERIC_PCI_IOMAP
	select GENERIC_SCHED_CLOCK
	select HAVE_ARCH_HASH
	select HAVE_ARCH_KGDB
	select HAVE_DEBUG_KMEMLEAK
	select HAVE_DYNAMIC_FTRACE
	select HAVE_FTRACE_MCOUNT_RECORD
	select HAVE_FUNCTION_GRAPH_TRACER
	select HAVE_FUNCTION_TRACER
	select HAVE_MEMBLOCK_NODE_MAP
	select HAVE_OPROFILE
	select HAVE_PCI
	select IRQ_DOMAIN
	select XILINX_INTC
	select MODULES_USE_ELF_RELA
	select OF
	select OF_EARLY_FLATTREE
	select PCI_DOMAINS_GENERIC if PCI
	select PCI_SYSCALL if PCI
	select TRACING_SUPPORT
	select VIRT_TO_BUS
	select CPU_NO_EFFICIENT_FFS
	select MMU_GATHER_NO_RANGE if MMU

	# Endianness selection
	choice
	prompt "Endianness selection"
	default CPU_LITTLE_ENDIAN
	help
	microblaze architectures can be configured for either little or
	big endian formats. Be sure to select the appropriate mode.

	config CPU_BIG_ENDIAN
	bool "Big endian"

	config CPU_LITTLE_ENDIAN
	bool "Little endian"

	endchoice

	config ZONE_DMA
	def_bool y

	config ARCH_HAS_ILOG2_U32
	def_bool n

	config ARCH_HAS_ILOG2_U64
	def_bool n

	config GENERIC_HWEIGHT
	def_bool y

	config GENERIC_CALIBRATE_DELAY
	def_bool y

	config GENERIC_CSUM
	def_bool y

	config STACKTRACE_SUPPORT
	def_bool y

	config LOCKDEP_SUPPORT
	def_bool y

	source "arch/microblaze/Kconfig.platform"

	menu "Processor type and features"

	source "kernel/Kconfig.hz"

	config MMU
	bool "MMU support"
	default n

	comment "Boot options"

	config CMDLINE_BOOL
	bool "Default bootloader kernel arguments"

	config CMDLINE
	string "Default kernel command string"
	depends on CMDLINE_BOOL
	default "console=ttyUL0,115200"
	help
	On some architectures there is currently no way for the boot loader
	to pass arguments to the kernel. For these architectures, you should
	supply some command-line options at build time by entering them
	here.

	config CMDLINE_FORCE
	bool "Force default kernel command string"
	depends on CMDLINE_BOOL
	default n
	help
	Set this to have arguments from the default kernel command string
	override those passed by the boot loader.

	config SECCOMP
	bool "Enable seccomp to safely compute untrusted bytecode"
	depends on PROC_FS
	default y
	help
	This kernel feature is useful for number crunching applications
	that may need to compute untrusted bytecode during their
	execution. By using pipes or other transports made available to
	the process as file descriptors supporting the read/write
	syscalls, it's possible to isolate those applications in
	their own address space using seccomp. Once seccomp is
	enabled via /proc/<pid>/seccomp, it cannot be disabled
	and the task is only allowed to execute a few safe syscalls
	defined by each seccomp mode.

	If unsure, say Y. Only embedded should say N here.

	endmenu

	menu "Kernel features"

	config NR_CPUS
	int
	default "1"

	config ADVANCED_OPTIONS
	bool "Prompt for advanced kernel configuration options"
	help
	This option will enable prompting for a variety of advanced kernel
	configuration options. These options can cause the kernel to not
	work if they are set incorrectly, but can be used to optimize certain
	aspects of kernel memory management.

	Unless you know what you are doing, say N here.

	comment "Default settings for advanced configuration options are used"
	depends on !ADVANCED_OPTIONS

	config XILINX_UNCACHED_SHADOW
	bool "Are you using uncached shadow for RAM ?"
	depends on ADVANCED_OPTIONS && !MMU
	default n
	help
	This is needed to be able to allocate uncachable memory regions.
	The feature requires the design to define the RAM memory controller
	window to be twice as large as the actual physical memory.

	config HIGHMEM
	bool "High memory support"
	depends on MMU
	help
	The address space of Microblaze processors is only 4 Gigabytes large
	and it has to accommodate user address space, kernel address
	space as well as some memory mapped IO. That means that, if you
	have a large amount of physical memory and/or IO, not all of the
	memory can be "permanently mapped" by the kernel. The physical
	memory that is not permanently mapped is called "high memory".

	If unsure, say n.

	config LOWMEM_SIZE_BOOL
	bool "Set maximum low memory"
	depends on ADVANCED_OPTIONS && MMU
	help
	This option allows you to set the maximum amount of memory which
	will be used as "low memory", that is, memory which the kernel can
	access directly, without having to set up a kernel virtual mapping.
	This can be useful in optimizing the layout of kernel virtual
	memory.

	Say N here unless you know what you are doing.

	config LOWMEM_SIZE
	hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
	default "0x30000000"

	config MANUAL_RESET_VECTOR
	hex "Microblaze reset vector address setup"
	default "0x0"
	help
	Set this option to have the kernel override the CPU Reset vector.
	If zero, no change will be made to the MicroBlaze reset vector at
	address 0x0.
	If non-zero, a jump instruction to this address, will be written
	to the reset vector at address 0x0.
	If you are unsure, set it to default value 0x0.

	config KERNEL_START_BOOL
	bool "Set custom kernel base address"
	depends on ADVANCED_OPTIONS
	help
	This option allows you to set the kernel virtual address at which
	the kernel will map low memory (the kernel image will be linked at
	this address). This can be useful in optimizing the virtual memory
	layout of the system.

	Say N here unless you know what you are doing.

	config KERNEL_START
	hex "Virtual address of kernel base" if KERNEL_START_BOOL
	default "0xc0000000" if MMU
	default KERNEL_BASE_ADDR if !MMU

	config TASK_SIZE_BOOL
	bool "Set custom user task size"
	depends on ADVANCED_OPTIONS && MMU
	help
	This option allows you to set the amount of virtual address space
	allocated to user tasks. This can be useful in optimizing the
	virtual memory layout of the system.

	Say N here unless you know what you are doing.

	config TASK_SIZE
	hex "Size of user task space" if TASK_SIZE_BOOL
	default "0x80000000"

	choice
	prompt "Page size"
	default MICROBLAZE_4K_PAGES
	depends on ADVANCED_OPTIONS && !MMU
	help
	Select the kernel logical page size. Increasing the page size
	will reduce software overhead at each page boundary, allow
	hardware prefetch mechanisms to be more effective, and allow
	larger dma transfers increasing IO efficiency and reducing
	overhead. However the utilization of memory will increase.
	For example, each cached file will using a multiple of the
	page size to hold its contents and the difference between the
	end of file and the end of page is wasted.

	If unsure, choose 4K_PAGES.

	config MICROBLAZE_4K_PAGES
	bool "4k page size"

	config MICROBLAZE_16K_PAGES
	bool "16k page size"

	config MICROBLAZE_64K_PAGES
	bool "64k page size"

	endchoice

	endmenu

	menu "Bus Options"

	config PCI_XILINX
	bool "Xilinx PCI host bridge support"
	depends on PCI

	endmenu