linux_kernel/arch/parisc/Kconfig

# SPDX-License-Identifier: GPL-2.0
config PARISC
	def_bool y
	select ARCH_MIGHT_HAVE_PC_PARPORT
	select HAVE_IDE
	select HAVE_OPROFILE
	select HAVE_FUNCTION_TRACER
	select HAVE_FUNCTION_GRAPH_TRACER
	select HAVE_SYSCALL_TRACEPOINTS
	select ARCH_WANT_FRAME_POINTERS
	select ARCH_HAS_ELF_RANDOMIZE
	select ARCH_HAS_STRICT_KERNEL_RWX
	select ARCH_HAS_UBSAN_SANITIZE_ALL
	select ARCH_SUPPORTS_MEMORY_FAILURE
	select RTC_CLASS
	select RTC_DRV_GENERIC
	select INIT_ALL_POSSIBLE
	select BUG
	select BUILDTIME_EXTABLE_SORT
	select HAVE_PERF_EVENTS
	select HAVE_KERNEL_BZIP2
	select HAVE_KERNEL_GZIP
	select HAVE_KERNEL_LZ4
	select HAVE_KERNEL_LZMA
	select HAVE_KERNEL_LZO
	select HAVE_KERNEL_XZ
	select GENERIC_ATOMIC64 if !64BIT
	select GENERIC_IRQ_PROBE
	select GENERIC_PCI_IOMAP
	select ARCH_HAVE_NMI_SAFE_CMPXCHG
	select GENERIC_SMP_IDLE_THREAD
	select GENERIC_CPU_DEVICES
	select GENERIC_STRNCPY_FROM_USER
	select SYSCTL_ARCH_UNALIGN_ALLOW
	select SYSCTL_EXCEPTION_TRACE
	select HAVE_MOD_ARCH_SPECIFIC
	select VIRT_TO_BUS
	select MODULES_USE_ELF_RELA
	select CLONE_BACKWARDS
	select TTY # Needed for pdc_cons.c
	select HAVE_DEBUG_STACKOVERFLOW
	select HAVE_ARCH_AUDITSYSCALL
	select HAVE_ARCH_HASH
	select HAVE_ARCH_SECCOMP_FILTER
	select HAVE_ARCH_TRACEHOOK
	select HAVE_REGS_AND_STACK_ACCESS_API
	select GENERIC_SCHED_CLOCK
	select HAVE_UNSTABLE_SCHED_CLOCK if SMP
	select GENERIC_CLOCKEVENTS
	select ARCH_NO_COHERENT_DMA_MMAP
	select CPU_NO_EFFICIENT_FFS
	select NEED_DMA_MAP_STATE
	select NEED_SG_DMA_LENGTH

	help
	  The PA-RISC microprocessor is designed by Hewlett-Packard and used
	  in many of their workstations & servers (HP9000 700 and 800 series,
	  and later HP3000 series).  The PA-RISC Linux project home page is
	  at <http://www.parisc-linux.org/>.

config CPU_BIG_ENDIAN
	def_bool y

config MMU
	def_bool y

config STACK_GROWSUP
	def_bool y

config GENERIC_LOCKBREAK
	bool
	default y
	depends on SMP && PREEMPT

config RWSEM_GENERIC_SPINLOCK
	def_bool y

config RWSEM_XCHGADD_ALGORITHM
	bool

config ARCH_HAS_ILOG2_U32
	bool
	default n

config ARCH_HAS_ILOG2_U64
	bool
	default n

config GENERIC_BUG
	bool
	default y
	depends on BUG

config GENERIC_HWEIGHT
	bool
	default y

config GENERIC_CALIBRATE_DELAY
	bool
	default y

config TIME_LOW_RES
	bool
	depends on SMP
	default y

# unless you want to implement ACPI on PA-RISC ... ;-)
config PM
	bool

config STACKTRACE_SUPPORT
	def_bool y

config ISA_DMA_API
	bool

config ARCH_MAY_HAVE_PC_FDC
	bool
	depends on BROKEN
	default y

config PGTABLE_LEVELS
	int
	default 3 if 64BIT && PARISC_PAGE_SIZE_4KB
	default 2

config SYS_SUPPORTS_HUGETLBFS
	def_bool y if PA20


menu "Processor type and features"

choice
	prompt "Processor type"
	default PA7000

config PA7000
	bool "PA7000/PA7100"
	---help---
	  This is the processor type of your CPU.  This information is
	  used for optimizing purposes.  In order to compile a kernel
	  that can run on all 32-bit PA CPUs (albeit not optimally fast),
	  you can specify "PA7000" here.

	  Specifying "PA8000" here will allow you to select a 64-bit kernel
	  which is required on some machines.

config PA7100LC
	bool "PA7100LC"
	help
	  Select this option for the PCX-L processor, as used in the
	  712, 715/64, 715/80, 715/100, 715/100XC, 725/100, 743, 748,
	  D200, D210, D300, D310 and E-class

config PA7200
	bool "PA7200"
	help
	  Select this option for the PCX-T' processor, as used in the
	  C100, C110, J100, J110, J210XC, D250, D260, D350, D360,
	  K100, K200, K210, K220, K400, K410 and K420

config PA7300LC
	bool "PA7300LC"
	help
	  Select this option for the PCX-L2 processor, as used in the
	  744, A180, B132L, B160L, B180L, C132L, C160L, C180L,
	  D220, D230, D320 and D330.

config PA8X00
	bool "PA8000 and up"
	help
	  Select this option for PCX-U to PCX-W2 processors.

endchoice

# Define implied options from the CPU selection here

config PA20
	def_bool y
	depends on PA8X00

config PA11
	def_bool y
	depends on PA7000 || PA7100LC || PA7200 || PA7300LC
	select ARCH_HAS_SYNC_DMA_FOR_CPU
	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
	select DMA_DIRECT_OPS
	select DMA_NONCOHERENT_CACHE_SYNC

config PREFETCH
	def_bool y
	depends on PA8X00 || PA7200

config MLONGCALLS
	bool "Enable the -mlong-calls compiler option for big kernels"
	default y
	depends on PA8X00
	help
	  If you configure the kernel to include many drivers built-in instead
	  as modules, the kernel executable may become too big, so that the
	  linker will not be able to resolve some long branches and fails to link
	  your vmlinux kernel. In that case enabling this option will help you
	  to overcome this limit by using the -mlong-calls compiler option.

	  Usually you want to say N here, unless you e.g. want to build
	  a kernel which includes all necessary drivers built-in and which can
	  be used for TFTP booting without the need to have an initrd ramdisk.

	  Enabling this option will probably slow down your kernel.

config 64BIT
	bool "64-bit kernel"
	depends on PA8X00
	help
	  Enable this if you want to support 64bit kernel on PA-RISC platform.

	  At the moment, only people willing to use more than 2GB of RAM,
	  or having a 64bit-only capable PA-RISC machine should say Y here.

	  Since there is no 64bit userland on PA-RISC, there is no point to
	  enable this option otherwise. The 64bit kernel is significantly bigger
	  and slower than the 32bit one.

choice
	prompt "Kernel page size"
	default PARISC_PAGE_SIZE_4KB

config PARISC_PAGE_SIZE_4KB
	bool "4KB"
	help
	  This lets you select the page size of the kernel.  For best
	  performance, a page size of 16KB is recommended.  For best
	  compatibility with 32bit applications, a page size of 4KB should be
	  selected (the vast majority of 32bit binaries work perfectly fine
	  with a larger page size).

	  4KB                For best 32bit compatibility
	  16KB               For best performance
	  64KB               For best performance, might give more overhead.

	  If you don't know what to do, choose 4KB.

config PARISC_PAGE_SIZE_16KB
	bool "16KB"
	depends on PA8X00 && BROKEN

config PARISC_PAGE_SIZE_64KB
	bool "64KB"
	depends on PA8X00 && BROKEN

endchoice

config PARISC_SELF_EXTRACT
	bool "Build kernel as self-extracting executable"
	default y
	help
	  Say Y if you want to build the parisc kernel as a kind of
	  self-extracting executable.

	  If you say N here, the kernel will be compressed with gzip
	  which can be loaded by the palo bootloader directly too.

	  If you don't know what to do here, say Y.

config SMP
	bool "Symmetric multi-processing support"
	---help---
	  This enables support for systems with more than one CPU. If you have
	  a system with only one CPU, say N. If you have a system with more
	  than one CPU, say Y.

	  If you say N here, the kernel will run on uni- and multiprocessor
	  machines, but will use only one CPU of a multiprocessor machine.
	  On a uniprocessor machine, the kernel will run faster if you say N.

	  See also <file:Documentation/lockup-watchdogs.txt> and the SMP-HOWTO
	  available at <http://www.tldp.org/docs.html#howto>.

	  If you don't know what to do here, say N.

config PARISC_CPU_TOPOLOGY
	bool "Support cpu topology definition"
	depends on SMP
	default y
	help
	  Support PARISC cpu topology definition.

config SCHED_MC
	bool "Multi-core scheduler support"
	depends on PARISC_CPU_TOPOLOGY && PA8X00
	help
	  Multi-core scheduler support improves the CPU scheduler's decision
	  making when dealing with multi-core CPU chips at a cost of slightly
	  increased overhead in some places. If unsure say N here.

config IRQSTACKS
	bool "Use separate kernel stacks when processing interrupts"
	default y
	help
	  If you say Y here the kernel will use separate kernel stacks
	  for handling hard and soft interrupts.  This can help avoid
	  overflowing the process kernel stacks.

config HOTPLUG_CPU
	bool
	default y if SMP

config ARCH_SELECT_MEMORY_MODEL
	def_bool y
	depends on 64BIT

config ARCH_DISCONTIGMEM_ENABLE
	def_bool y
	depends on 64BIT

config ARCH_FLATMEM_ENABLE
	def_bool y

config ARCH_DISCONTIGMEM_DEFAULT
	def_bool y
	depends on ARCH_DISCONTIGMEM_ENABLE

config NODES_SHIFT
	int
	default "3"
	depends on NEED_MULTIPLE_NODES

source "kernel/Kconfig.hz"

config COMPAT
	def_bool y
	depends on 64BIT
	select COMPAT_BINFMT_ELF if BINFMT_ELF

config SYSVIPC_COMPAT
	def_bool y
	depends on COMPAT && SYSVIPC

config AUDIT_ARCH
	def_bool y

config NR_CPUS
	int "Maximum number of CPUs (2-32)"
	range 2 32
	depends on SMP
	default "4"

endmenu


source "drivers/parisc/Kconfig"

config SECCOMP
	def_bool y
	prompt "Enable seccomp to safely compute untrusted bytecode"
	---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 prctl(PR_SET_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.