path: root/arch/alpha/Kconfig

# SPDX-License-Identifier: GPL-2.0
config ALPHA
	bool
	default y
	select GENERIC_ENTRY
	select HAVE_SYSCALL_TRACEPOINTS
	select ARCH_32BIT_USTAT_F_TINODE
	select ARCH_HAS_CURRENT_STACK_POINTER
	select ARCH_HAS_DEBUG_VM_PGTABLE
	select ARCH_HAS_DMA_OPS if PCI
	select ARCH_HAS_FAST_MULTIPLIER
	select ARCH_HAS_GCOV_PROFILE_ALL
	select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
	select ARCH_HAS_PTE_SPECIAL
	select ARCH_HAS_UBSAN
	select ARCH_MIGHT_HAVE_PC_PARPORT
	select ARCH_MIGHT_HAVE_PC_SERIO
	select ARCH_MODULE_NEEDS_WEAK_PER_CPU if SMP
	select ARCH_NO_PREEMPT
	select ARCH_NO_SG_CHAIN
	select ARCH_SUPPORTS_ATOMIC_RMW
	select ARCH_SUPPORTS_HUGETLBFS
	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
	select ARCH_SUPPORTS_PAGE_TABLE_CHECK
	select ARCH_USE_CMPXCHG_LOCKREF
	select ARCH_USE_MEMTEST
	select FORCE_PCI
	select PCI_DOMAINS if PCI
	select PCI_SYSCALL if PCI
	select HAVE_ARCH_COMPILER_H
	select HAVE_ASM_MODVERSIONS
	select HAVE_DEBUG_KMEMLEAK
	select HAVE_GUP_FAST
	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 HAVE_KERNEL_ZSTD
	select HAVE_PAGE_SIZE_8KB
	select HAVE_PCSPKR_PLATFORM
	select HAVE_PERF_EVENTS
	select HAVE_PERF_REGS
	select HAVE_PERF_USER_STACK_DUMP
	select NEED_DMA_MAP_STATE
	select NEED_SG_DMA_LENGTH
	select GENERIC_IRQ_PROBE
	select GENERIC_PCI_IOMAP
	select AUTO_IRQ_AFFINITY if SMP
	select GENERIC_IRQ_SHOW
	select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
	select ARCH_WANT_IPC_PARSE_VERSION
	select ARCH_WANT_LD_ORPHAN_WARN
	select ARCH_HAVE_NMI_SAFE_CMPXCHG
	select AUDIT_ARCH
	select EDAC_SUPPORT
	select GENERIC_CPU_VULNERABILITIES
	select GENERIC_SMP_IDLE_THREAD
	select HAS_IOPORT
	select HAVE_ARCH_AUDITSYSCALL
	select HAVE_ARCH_SECCOMP
	select HAVE_ARCH_SECCOMP_FILTER
	select HAVE_ARCH_THREAD_STRUCT_WHITELIST
	select HAVE_ARCH_TRACEHOOK
	select HAVE_MOD_ARCH_SPECIFIC
	select LOCK_MM_AND_FIND_VMA
	select MODULES_USE_ELF_RELA
	select ODD_RT_SIGACTION
	select OLD_SIGSUSPEND
	select ARCH_STACKWALK
	select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67
	select MMU_GATHER_NO_RANGE
	select SPARSE_IRQ
	select SPARSEMEM_EXTREME if SPARSEMEM
	select SYSCTL_EXCEPTION_TRACE
	select ZONE_DMA
	select TRACE_IRQFLAGS_SUPPORT
	select ARCH_WANT_FRAME_POINTERS
	help
	  The Alpha is a 64-bit general-purpose processor designed and
	  marketed by the Digital Equipment Corporation of blessed memory,
	  now Hewlett-Packard.  The Alpha Linux project has a home page at
	  <http://www.alphalinux.org/>.

config 64BIT
	def_bool y

config MMU
	bool
	default y

config ARCH_HAS_ILOG2_U32
	bool
	default n

config ARCH_HAS_ILOG2_U64
	bool
	default n

config GENERIC_CALIBRATE_DELAY
	bool
	default y

config GENERIC_ISA_DMA
	bool
	default y

config PGTABLE_LEVELS
	int
	default 3

config AUDIT_ARCH
	bool

config STACKTRACE_SUPPORT
	def_bool y

config LOCKDEP_SUPPORT
	def_bool y

menu "System setup"

choice
	prompt "Alpha system type"
	default ALPHA_GENERIC
	help
	  This is the system type of your hardware.  A "generic" kernel will
	  run on any supported Alpha system. However, if you configure a
	  kernel for your specific system, it will be faster and smaller.
	  Only EV56 (21164A) and later CPUs are supported.

	  To find out what type of Alpha system you have, see the system and
	  motherboard lists at
	  <https://alphalinux.org/wiki/hardware:systems> and
	  <https://alphalinux.org/wiki/hardware:motherboards>. In summary:

	  Alcor/Alpha-XLT     AlphaStation 500, Alpha XL 366, 433
	  DP264               DP264, UP2000(+), DS10, DS10L, DS20, DS20E,
	                      ES40, XP900, XP1000
	  Eiger               Eiger (OEM)
	  LX164               AlphaPC164-LX
	  Marvel              AlphaServer ES47, ES80, GS1280
	  Miata               Personal Workstation 433/500/600 a/au
	  Mikasa              AlphaServer 1000
	  Nautilus            UP1000, UP1100, UP1500
	  Noritake            AlphaServer 1000A, 800, AlphaStation 600A,
	                      Digital Server 3300
	  PC164               AlphaPC164
	  Rawhide             AlphaServer 1200, 4000, 4100,
	                      Digital Server 5300, 7300
	  Ruffian             RPX164-2, AlphaPC164-UX, AlphaPC164-BX
	  RX164               AlphaPC164-RX
	  SX164               AlphaPC164-SX
	  Sable               AlphaServer 2000, 2100
	  Shark               AlphaServer DS20L, API NetWorks CS20
	  Takara              Takara (OEM)
	  Titan               AlphaServer DS15, DS25, ES45, TS202c
	  Wildfire            AlphaServer GS80, GS160, GS320

	  If you don't know what to do, choose "generic".

config ALPHA_GENERIC
	bool "Generic"
	depends on TTY
	select HAVE_EISA
	help
	  A generic kernel will run on all supported Alpha hardware.

config ALPHA_ALCOR
	bool "Alcor/Alpha-XLT"
	select HAVE_EISA
	help
	  For systems using the Digital ALCOR chipset: 5 chips (4, 64-bit data
	  slices (Data Switch, DSW) - 208-pin PQFP and 1 control (Control, I/O
	  Address, CIA) - a 383 pin plastic PGA).  It provides a DRAM
	  controller (256-bit memory bus) and a PCI interface.  It also does
	  all the work required to support an external Bcache and to maintain
	  memory coherence when a PCI device DMAs into (or out of) memory.
	  It is used by the AlphaStation 500 and the Alpha XL 366 and 433.

	  See <https://alphalinux.org/wiki/hardware:systems:alcor>.

config ALPHA_DP264
	bool "DP264"
	help
	  Various 21264 systems with the tsunami core logic chipset.
	  API NetWorks: 264DP, UP2000(+);
	  Compaq: DS10, DS10L, XP900, XP1000, DS20, DS20E, ES40.

	  See:
	  <https://alphalinux.org/wiki/hardware:systems:webbrick>
	  <https://alphalinux.org/wiki/hardware:systems:goldrush>
	  <https://alphalinux.org/wiki/hardware:systems:clipper>
	  <https://alphalinux.org/wiki/hardware:systems:monet>
	  <https://alphalinux.org/wiki/hardware:motherboards:pc264dp>
	  <https://alphalinux.org/wiki/hardware:motherboards:up2000>

config ALPHA_EIGER
	bool "Eiger"
	help
	  Apparently an obscure OEM single-board computer based on the
	  Typhoon/Tsunami chipset family. Information on it is scanty.

	  See <https://alphalinux.org/wiki/hardware:motherboards:eiger>.

config ALPHA_LX164
	bool "LX164"
	help
	  AlphaPC164-LX, a 21164A-based single-board computer using the
	  Pyxis chipset.

	  See <https://alphalinux.org/wiki/hardware:motherboards:pc164lx>.

config ALPHA_MARVEL
	bool "Marvel"
	help
	  AlphaServer ES47 / ES80 / GS1280 based on EV7.

	  See <https://alphalinux.org/wiki/hardware:systems:marvel>.

config ALPHA_MIATA
	bool "Miata"
	select HAVE_EISA
	help
	  The Digital Personal Workstation (PWS 433a, 433au, 500a, 500au,
	  600a, or 600au).

	  See <https://alphalinux.org/wiki/hardware:systems:miata>.

config ALPHA_MIKASA
	bool "Mikasa"
	help
	  AlphaServer 1000-based Alpha systems.

	  See <https://alphalinux.org/wiki/hardware:systems:mikasa>.

config ALPHA_NAUTILUS
	bool "Nautilus"
	help
	  UP1000, UP1100 and UP1500 systems based on the AMD 751 or 761
	  chipset.

	  See:
	  <https://alphalinux.org/wiki/hardware:motherboards:up1000>
	  <https://alphalinux.org/wiki/hardware:motherboards:up1100>
	  <https://alphalinux.org/wiki/hardware:motherboards:up1500>

config ALPHA_NORITAKE
	bool "Noritake"
	select HAVE_EISA
	help
	  AlphaServer 1000A, AlphaServer 800, AlphaStation 600A and
	  Digital Server 3300 systems.

	  See <https://alphalinux.org/wiki/hardware:systems:noritake>.

config ALPHA_PC164
	bool "PC164"
	help
	  AlphaPC164, a 21164A-based single-board computer using the CIA
	  chipset.

	  See <https://alphalinux.org/wiki/hardware:motherboards:pc164>.

config ALPHA_RAWHIDE
	bool "Rawhide"
	select HAVE_EISA
	help
	  AlphaServer 1200, 4000 and 4100 and Digital Server 5300 and 7300
	  machines.

	  See <https://alphalinux.org/wiki/hardware:systems:rawhide>.

config ALPHA_RUFFIAN
	bool "Ruffian"
	help
	  DeskStation RPX164-2, AlphaPC164-UX and AlphaPC164-BX boards.
	  They have no SRM console and can only boot Linux through MILO.

	  See <https://alphalinux.org/wiki/hardware:motherboards:pc164ux>.

config ALPHA_RX164
	bool "RX164"
	help
	  AlphaPC164-RX, a 21164PC-based single-board computer using the
	  Polaris chipset. It has no SRM console and can only boot Linux
	  through MILO.

	  See <https://alphalinux.org/wiki/hardware:motherboards:pc164rx>.

config ALPHA_SX164
	bool "SX164"
	help
	  AlphaPC164-SX, a 21164PC-based single-board computer using the
	  Pyxis chipset.

	  See <https://alphalinux.org/wiki/hardware:motherboards:pc164sx>.

config ALPHA_SABLE
	bool "Sable"
	select HAVE_EISA
	help
	  Digital AlphaServer 2000 and 2100-based systems.

	  See <https://alphalinux.org/wiki/hardware:systems:sable>.

config ALPHA_SHARK
	bool "Shark"
	help
	  AlphaServer DS20L and API NetWorks CS20 systems based on the
	  Tsunami chipset.

	  See <https://alphalinux.org/wiki/hardware:systems:shark>.

config ALPHA_TAKARA
	bool "Takara"
	help
	  Alpha 21164-based OEM single-board computer.

	  See <https://alphalinux.org/wiki/hardware:motherboards:takara>.

config ALPHA_TITAN
	bool "Titan"
	help
	  AlphaServer DS15, DS25, ES45 and TS202c based on EV68 and the
	  Titan chipset.

	  See <https://alphalinux.org/wiki/hardware:systems:titan>.

config ALPHA_WILDFIRE
	bool "Wildfire"
	help
	  AlphaServer GS80, GS160 and GS320 SMP based on the EV67 or EV68
	  core.

	  See <https://alphalinux.org/wiki/hardware:systems:wildfire>.

endchoice

# clear all implied options (don't want default values for those):
# Most of these machines have ISA slots; not exactly sure which don't,
# and this doesn't activate hordes of code, so do it always.
config ISA
	bool
	default y
	help
	  Find out whether you have ISA slots on your motherboard.  ISA is the
	  name of a bus system, i.e. the way the CPU talks to the other stuff
	  inside your box.  Other bus systems are PCI, EISA, MicroChannel
	  (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
	  newer boards don't support it.  If you have ISA, say Y, otherwise N.

config ISA_DMA_API
	bool
	default y

config ALPHA_CIA
	bool
	depends on ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_NORITAKE || ALPHA_MIKASA || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_ALCOR
	default y

config ALPHA_EV56
	bool
	default y if ALPHA_ALCOR || ALPHA_RX164 || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_NORITAKE || ALPHA_MIKASA || ALPHA_RAWHIDE || ALPHA_SABLE

config ALPHA_T2
	bool
	depends on ALPHA_SABLE
	default y

config ALPHA_PYXIS
	bool
	depends on ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN
	default y

config ALPHA_EV6
	bool
	depends on ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER || ALPHA_MARVEL
	default y

config ALPHA_TSUNAMI
	bool
	depends on ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER
	default y

config ALPHA_EV67
	bool "EV67 (or later) CPU (speed > 600MHz)?" if ALPHA_DP264 || ALPHA_EIGER
	default y if ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL
	help
	  Is this a machine based on the EV67 core?  If in doubt, select N here
	  and the machine will be treated as an EV6.

config ALPHA_MCPCIA
	bool
	depends on ALPHA_RAWHIDE
	default y

config ALPHA_POLARIS
	bool
	depends on ALPHA_RX164
	default y

config ALPHA_IRONGATE
	bool
	depends on ALPHA_NAUTILUS
	default y

config GENERIC_HWEIGHT
	bool
	default y if !ALPHA_EV67

config ALPHA_BROKEN_IRQ_MASK
	bool
	depends on ALPHA_GENERIC || ALPHA_PC164
	default y

config VGA_HOSE
	bool
	depends on VGA_CONSOLE && (ALPHA_GENERIC || ALPHA_TITAN || ALPHA_MARVEL || ALPHA_TSUNAMI)
	default y
	help
	  Support VGA on an arbitrary hose; needed for several platforms
	  which always have multiple hoses, and whose consoles support it.


config ALPHA_QEMU
	bool "Run under QEMU emulation"
	depends on !ALPHA_GENERIC
	help
	  Assume the presence of special features supported by QEMU PALcode
	  that reduce the overhead of system emulation.

	  Generic kernels will auto-detect QEMU.  But when building a
	  system-specific kernel, the assumption is that we want to
	  eliminate as many runtime tests as possible.

	  If unsure, say N.


config ALPHA_SRM
	bool "Use SRM as bootloader" if ALPHA_PC164 || ALPHA_TAKARA || ALPHA_ALCOR || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_NAUTILUS
	depends on TTY
	default y if ALPHA_MIKASA || ALPHA_SABLE || ALPHA_NORITAKE || ALPHA_DP264 || ALPHA_RAWHIDE || ALPHA_EIGER || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL
	help
	  There are two different types of booting firmware on Alphas: SRM,
	  which is command line driven, and ARC, which uses menus and arrow
	  keys.

	  The usual way to load Linux on an Alpha machine is to use MILO
	  (a bootloader that lets you pass command line parameters to the
	  kernel just like lilo does for the x86 architecture) which can be
	  loaded either from ARC or can be installed directly as a permanent
	  firmware replacement from floppy (which requires changing a certain
	  jumper on the motherboard). If you want to do either of these, say N
	  here. If MILO doesn't work on your system, you can bypass it
	  altogether and boot Linux directly from an SRM console; say Y here
	  in order to do that.

	  If unsure, say N.

config ARCH_MAY_HAVE_PC_FDC
	def_bool y

config SMP
	bool "Symmetric multi-processing support"
	depends on ALPHA_SABLE || ALPHA_RAWHIDE || ALPHA_DP264 || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_GENERIC || ALPHA_SHARK || ALPHA_MARVEL
	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. If
	  you say Y here, the kernel will run on many, but not all,
	  uniprocessor machines. On a uniprocessor machine, the kernel
	  will run faster if you say N here.

	  See also the SMP-HOWTO available at
	  <https://www.tldp.org/docs.html#howto>.

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

config NR_CPUS
	int "Maximum number of CPUs (2-32)"
	range 2 32
	depends on SMP
	default "32" if ALPHA_GENERIC || ALPHA_MARVEL || ALPHA_WILDFIRE
	default "4"
	help
	  The kernel supports at most 32 CPUs. Only Marvel and Wildfire
	  systems have more than 4.

config ARCH_SPARSEMEM_ENABLE
	bool "Sparse Memory Support"
	help
	  Say Y to support efficient handling of discontiguous physical memory,
	  for systems that have huge holes in the physical address space.

config ALPHA_WTINT
	bool "Use WTINT" if ALPHA_SRM || ALPHA_GENERIC
	default y if ALPHA_QEMU
	default n if ALPHA_EV56
	default n if !ALPHA_SRM && !ALPHA_GENERIC
	default y if SMP
	help
	  The Wait for Interrupt (WTINT) PALcall attempts to place the CPU
	  to sleep until the next interrupt.  This may reduce the power
	  consumed, and the heat produced by the computer.  However, it has
	  the side effect of making the cycle counter unreliable as a timing
	  device across the sleep.

	  For emulation under QEMU, definitely say Y here, as we have other
	  mechanisms for measuring time than the cycle counter.

	  For EV56 systems, or for systems running MILO, sleep mode is not
	  supported so you might as well say N here.

	  For SMP systems we cannot use the cycle counter for timing anyway,
	  so you might as well say Y here.

	  If unsure, say N.

# LARGE_VMALLOC is racy, if you *really* need it then fix it first
config ALPHA_LARGE_VMALLOC
	bool
	help
	  Process creation and other aspects of virtual memory management can
	  be streamlined if we restrict the kernel to one PGD for all vmalloc
	  allocations.  This equates to about 8GB.

	  Under normal circumstances, this is so far and above what is needed
	  as to be laughable.  However, there are certain applications (such
	  as benchmark-grade in-kernel web serving) that can make use of as
	  much vmalloc space as is available.

	  Say N unless you know you need gobs and gobs of vmalloc space.

config VERBOSE_MCHECK
	bool "Verbose Machine Checks"

config VERBOSE_MCHECK_ON
	int "Verbose Printing Mode (0=off, 1=on, 2=all)"
	depends on VERBOSE_MCHECK
	default 1
	help
	  This option allows the default printing mode to be set, and then
	  possibly overridden by a boot command argument.

	  For example, if one wanted the option of printing verbose
	  machine checks, but wanted the default to be as if verbose
	  machine check printing was turned off, then one would choose
	  the printing mode to be 0. Then, upon reboot, one could add
	  the boot command line "verbose_mcheck=1" to get the normal
	  verbose machine check printing, or "verbose_mcheck=2" to get
	  the maximum information available.

	  Take the default (1) unless you want more control or more info.

choice
	prompt "Timer interrupt frequency (HZ)?"
	default HZ_128 if ALPHA_QEMU
	default HZ_1200 if ALPHA_RAWHIDE
	default HZ_1024
	help
	  The frequency at which timer interrupts occur.  A high frequency
	  minimizes latency, whereas a low frequency minimizes overhead of
	  process accounting.  The later effect is especially significant
	  when being run under QEMU.

	  Note that some Alpha hardware cannot change the interrupt frequency
	  of the timer.  If unsure, say 1024 (or 1200 for Rawhide).

	config HZ_32
		bool "32 Hz"
	config HZ_64
		bool "64 Hz"
	config HZ_128
		bool "128 Hz"
	config HZ_256
		bool "256 Hz"
	config HZ_1024
		bool "1024 Hz"
	config HZ_1200
		bool "1200 Hz"
endchoice

config HZ
	int
	default 32 if HZ_32
	default 64 if HZ_64
	default 128 if HZ_128
	default 256 if HZ_256
	default 1200 if HZ_1200
	default 1024

config SRM_ENV
	tristate "SRM environment through procfs"
	depends on PROC_FS
	help
	  If you enable this option, a subdirectory inside /proc called
	  /proc/srm_environment will give you access to the all important
	  SRM environment variables (those which have a name) and also
	  to all others (by their internal number).

	  SRM is something like a BIOS for Alpha machines. There are some
	  other such BIOSes, like AlphaBIOS, which this driver cannot
	  support (hey, that's not SRM!).

	  Despite the fact that this driver doesn't work on all Alphas (but
	  only on those which have SRM as their firmware), it's save to
	  build it even if your particular machine doesn't know about SRM
	  (or if you intend to compile a generic kernel). It will simply
	  not create those subdirectory in /proc (and give you some warning,
	  of course).

	  This driver is also available as a module and will be called
	  srm_env then.

endmenu

# DUMMY_CONSOLE may be defined in drivers/video/console/Kconfig
# but we also need it if VGA_HOSE is set
config DUMMY_CONSOLE
	bool
	depends on VGA_HOSE
	default y