arch/sh/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0
   2 config SUPERH
   3         def_bool y
   4         select ARCH_HAS_BINFMT_FLAT if !MMU
   5         select ARCH_HAS_PTE_SPECIAL
   6         select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
   7         select ARCH_MIGHT_HAVE_PC_PARPORT
   8         select HAVE_PATA_PLATFORM
   9         select CLKDEV_LOOKUP
  10         select DMA_DECLARE_COHERENT
  11         select HAVE_IDE if HAS_IOPORT_MAP
  12         select HAVE_OPROFILE
  13         select HAVE_ARCH_TRACEHOOK
  14         select HAVE_PERF_EVENTS
  15         select HAVE_DEBUG_BUGVERBOSE
  16         select HAVE_FAST_GUP if MMU
  17         select ARCH_HAVE_CUSTOM_GPIO_H
  18         select ARCH_HAVE_NMI_SAFE_CMPXCHG if (GUSA_RB || CPU_SH4A)
  19         select ARCH_HAS_GCOV_PROFILE_ALL
  20         select PERF_USE_VMALLOC
  21         select HAVE_DEBUG_KMEMLEAK
  22         select HAVE_KERNEL_GZIP
  23         select CPU_NO_EFFICIENT_FFS
  24         select HAVE_KERNEL_BZIP2
  25         select HAVE_KERNEL_LZMA
  26         select HAVE_KERNEL_XZ
  27         select HAVE_KERNEL_LZO
  28         select HAVE_UID16
  29         select ARCH_WANT_IPC_PARSE_VERSION
  30         select HAVE_SYSCALL_TRACEPOINTS
  31         select HAVE_REGS_AND_STACK_ACCESS_API
  32         select MAY_HAVE_SPARSE_IRQ
  33         select IRQ_FORCED_THREADING
  34         select RTC_LIB
  35         select GENERIC_ATOMIC64
  36         select GENERIC_IRQ_SHOW
  37         select GENERIC_SMP_IDLE_THREAD
  38         select GENERIC_IDLE_POLL_SETUP
  39         select GENERIC_CLOCKEVENTS
  40         select GENERIC_CMOS_UPDATE if SH_SH03 || SH_DREAMCAST
  41         select GENERIC_PCI_IOMAP if PCI
  42         select GENERIC_SCHED_CLOCK
  43         select GENERIC_STRNCPY_FROM_USER
  44         select GENERIC_STRNLEN_USER
  45         select HAVE_MOD_ARCH_SPECIFIC if DWARF_UNWINDER
  46         select MODULES_USE_ELF_RELA
  47         select NO_GENERIC_PCI_IOPORT_MAP if PCI
  48         select OLD_SIGSUSPEND
  49         select OLD_SIGACTION
  50         select PCI_DOMAINS if PCI
  51         select HAVE_ARCH_AUDITSYSCALL
  52         select HAVE_FUTEX_CMPXCHG if FUTEX
  53         select HAVE_NMI
  54         select NEED_SG_DMA_LENGTH
  55         select ARCH_HAS_GIGANTIC_PAGE
  56
  57         help
  58           The SuperH is a RISC processor targeted for use in embedded systems
  59           and consumer electronics; it was also used in the Sega Dreamcast
  60           gaming console.  The SuperH port has a home page at
  61           <http://www.linux-sh.org/>.
  62
  63 config SUPERH32
  64         def_bool "$(ARCH)" = "sh"
  65         select ARCH_32BIT_OFF_T
  66         select GUP_GET_PTE_LOW_HIGH if X2TLB
  67         select HAVE_KPROBES
  68         select HAVE_KRETPROBES
  69         select HAVE_IOREMAP_PROT if MMU && !X2TLB
  70         select HAVE_FUNCTION_TRACER
  71         select HAVE_FTRACE_MCOUNT_RECORD
  72         select HAVE_DYNAMIC_FTRACE
  73         select ARCH_WANT_IPC_PARSE_VERSION
  74         select HAVE_FUNCTION_GRAPH_TRACER
  75         select HAVE_ARCH_KGDB
  76         select HAVE_HW_BREAKPOINT
  77         select HAVE_MIXED_BREAKPOINTS_REGS
  78         select PERF_EVENTS
  79         select ARCH_HIBERNATION_POSSIBLE if MMU
  80         select SPARSE_IRQ
  81         select HAVE_STACKPROTECTOR
  82
  83 config SUPERH64
  84         def_bool "$(ARCH)" = "sh64"
  85         select HAVE_EXIT_THREAD
  86         select KALLSYMS
  87
  88 config GENERIC_BUG
  89         def_bool y
  90         depends on BUG && SUPERH32
  91
  92 config GENERIC_CSUM
  93         def_bool y
  94         depends on SUPERH64
  95
  96 config GENERIC_HWEIGHT
  97         def_bool y
  98
  99 config GENERIC_CALIBRATE_DELAY
 100         bool
 101
 102 config GENERIC_LOCKBREAK
 103         def_bool y
 104         depends on SMP && PREEMPTION
 105
 106 config ARCH_SUSPEND_POSSIBLE
 107         def_bool n
 108
 109 config ARCH_HIBERNATION_POSSIBLE
 110         def_bool n
 111
 112 config SYS_SUPPORTS_APM_EMULATION
 113         bool
 114         select ARCH_SUSPEND_POSSIBLE
 115
 116 config SYS_SUPPORTS_HUGETLBFS
 117         bool
 118
 119 config SYS_SUPPORTS_SMP
 120         bool
 121
 122 config SYS_SUPPORTS_NUMA
 123         bool
 124
 125 config STACKTRACE_SUPPORT
 126         def_bool y
 127
 128 config LOCKDEP_SUPPORT
 129         def_bool y
 130
 131 config ARCH_HAS_ILOG2_U32
 132         def_bool n
 133
 134 config ARCH_HAS_ILOG2_U64
 135         def_bool n
 136
 137 config NO_IOPORT_MAP
 138         def_bool !PCI
 139         depends on !SH_CAYMAN && !SH_SH4202_MICRODEV && !SH_SHMIN && \
 140                    !SH_HP6XX && !SH_SOLUTION_ENGINE
 141
 142 config IO_TRAPPED
 143         bool
 144
 145 config SWAP_IO_SPACE
 146         bool
 147
 148 config DMA_COHERENT
 149         bool
 150
 151 config DMA_NONCOHERENT
 152         def_bool !DMA_COHERENT
 153         select ARCH_HAS_SYNC_DMA_FOR_DEVICE
 154
 155 config PGTABLE_LEVELS
 156         default 3 if X2TLB
 157         default 2
 158
 159 menu "System type"
 160
 161 #
 162 # Processor families
 163 #
 164 config CPU_SH2
 165         bool
 166         select SH_INTC
 167
 168 config CPU_SH2A
 169         bool
 170         select CPU_SH2
 171         select UNCACHED_MAPPING
 172
 173 config CPU_J2
 174         bool
 175         select CPU_SH2
 176         select OF
 177         select OF_EARLY_FLATTREE
 178
 179 config CPU_SH3
 180         bool
 181         select CPU_HAS_INTEVT
 182         select CPU_HAS_SR_RB
 183         select SH_INTC
 184         select SYS_SUPPORTS_SH_TMU
 185
 186 config CPU_SH4
 187         bool
 188         select CPU_HAS_INTEVT
 189         select CPU_HAS_SR_RB
 190         select CPU_HAS_FPU if !CPU_SH4AL_DSP
 191         select SH_INTC
 192         select SYS_SUPPORTS_SH_TMU
 193         select SYS_SUPPORTS_HUGETLBFS if MMU
 194
 195 config CPU_SH4A
 196         bool
 197         select CPU_SH4
 198
 199 config CPU_SH4AL_DSP
 200         bool
 201         select CPU_SH4A
 202         select CPU_HAS_DSP
 203
 204 config CPU_SH5
 205         bool
 206         select CPU_HAS_FPU
 207         select SYS_SUPPORTS_SH_TMU
 208         select SYS_SUPPORTS_HUGETLBFS if MMU
 209
 210 config CPU_SHX2
 211         bool
 212
 213 config CPU_SHX3
 214         bool
 215         select DMA_COHERENT
 216         select SYS_SUPPORTS_SMP
 217         select SYS_SUPPORTS_NUMA
 218
 219 config ARCH_SHMOBILE
 220         bool
 221         select ARCH_SUSPEND_POSSIBLE
 222         select PM
 223
 224 config CPU_HAS_PMU
 225        depends on CPU_SH4 || CPU_SH4A
 226        default y
 227        bool
 228
 229 if SUPERH32
 230
 231 choice
 232         prompt "Processor sub-type selection"
 233
 234 #
 235 # Processor subtypes
 236 #
 237
 238 # SH-2 Processor Support
 239
 240 config CPU_SUBTYPE_SH7619
 241         bool "Support SH7619 processor"
 242         select CPU_SH2
 243         select SYS_SUPPORTS_SH_CMT
 244
 245 config CPU_SUBTYPE_J2
 246         bool "Support J2 processor"
 247         select CPU_J2
 248         select SYS_SUPPORTS_SMP
 249         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 250
 251 # SH-2A Processor Support
 252
 253 config CPU_SUBTYPE_SH7201
 254         bool "Support SH7201 processor"
 255         select CPU_SH2A
 256         select CPU_HAS_FPU
 257         select SYS_SUPPORTS_SH_MTU2
 258
 259 config CPU_SUBTYPE_SH7203
 260         bool "Support SH7203 processor"
 261         select CPU_SH2A
 262         select CPU_HAS_FPU
 263         select SYS_SUPPORTS_SH_CMT
 264         select SYS_SUPPORTS_SH_MTU2
 265         select PINCTRL
 266
 267 config CPU_SUBTYPE_SH7206
 268         bool "Support SH7206 processor"
 269         select CPU_SH2A
 270         select SYS_SUPPORTS_SH_CMT
 271         select SYS_SUPPORTS_SH_MTU2
 272
 273 config CPU_SUBTYPE_SH7263
 274         bool "Support SH7263 processor"
 275         select CPU_SH2A
 276         select CPU_HAS_FPU
 277         select SYS_SUPPORTS_SH_CMT
 278         select SYS_SUPPORTS_SH_MTU2
 279
 280 config CPU_SUBTYPE_SH7264
 281         bool "Support SH7264 processor"
 282         select CPU_SH2A
 283         select CPU_HAS_FPU
 284         select SYS_SUPPORTS_SH_CMT
 285         select SYS_SUPPORTS_SH_MTU2
 286         select PINCTRL
 287
 288 config CPU_SUBTYPE_SH7269
 289         bool "Support SH7269 processor"
 290         select CPU_SH2A
 291         select CPU_HAS_FPU
 292         select SYS_SUPPORTS_SH_CMT
 293         select SYS_SUPPORTS_SH_MTU2
 294         select PINCTRL
 295
 296 config CPU_SUBTYPE_MXG
 297         bool "Support MX-G processor"
 298         select CPU_SH2A
 299         select SYS_SUPPORTS_SH_MTU2
 300         help
 301           Select MX-G if running on an R8A03022BG part.
 302
 303 # SH-3 Processor Support
 304
 305 config CPU_SUBTYPE_SH7705
 306         bool "Support SH7705 processor"
 307         select CPU_SH3
 308
 309 config CPU_SUBTYPE_SH7706
 310         bool "Support SH7706 processor"
 311         select CPU_SH3
 312         help
 313           Select SH7706 if you have a 133 Mhz SH-3 HD6417706 CPU.
 314
 315 config CPU_SUBTYPE_SH7707
 316         bool "Support SH7707 processor"
 317         select CPU_SH3
 318         help
 319           Select SH7707 if you have a  60 Mhz SH-3 HD6417707 CPU.
 320
 321 config CPU_SUBTYPE_SH7708
 322         bool "Support SH7708 processor"
 323         select CPU_SH3
 324         help
 325           Select SH7708 if you have a  60 Mhz SH-3 HD6417708S or
 326           if you have a 100 Mhz SH-3 HD6417708R CPU.
 327
 328 config CPU_SUBTYPE_SH7709
 329         bool "Support SH7709 processor"
 330         select CPU_SH3
 331         help
 332           Select SH7709 if you have a  80 Mhz SH-3 HD6417709 CPU.
 333
 334 config CPU_SUBTYPE_SH7710
 335         bool "Support SH7710 processor"
 336         select CPU_SH3
 337         select CPU_HAS_DSP
 338         help
 339           Select SH7710 if you have a SH3-DSP SH7710 CPU.
 340
 341 config CPU_SUBTYPE_SH7712
 342         bool "Support SH7712 processor"
 343         select CPU_SH3
 344         select CPU_HAS_DSP
 345         help
 346           Select SH7712 if you have a SH3-DSP SH7712 CPU.
 347
 348 config CPU_SUBTYPE_SH7720
 349         bool "Support SH7720 processor"
 350         select CPU_SH3
 351         select CPU_HAS_DSP
 352         select SYS_SUPPORTS_SH_CMT
 353         select USB_OHCI_SH if USB_OHCI_HCD
 354         select PINCTRL
 355         help
 356           Select SH7720 if you have a SH3-DSP SH7720 CPU.
 357
 358 config CPU_SUBTYPE_SH7721
 359         bool "Support SH7721 processor"
 360         select CPU_SH3
 361         select CPU_HAS_DSP
 362         select SYS_SUPPORTS_SH_CMT
 363         select USB_OHCI_SH if USB_OHCI_HCD
 364         help
 365           Select SH7721 if you have a SH3-DSP SH7721 CPU.
 366
 367 # SH-4 Processor Support
 368
 369 config CPU_SUBTYPE_SH7750
 370         bool "Support SH7750 processor"
 371         select CPU_SH4
 372         help
 373           Select SH7750 if you have a 200 Mhz SH-4 HD6417750 CPU.
 374
 375 config CPU_SUBTYPE_SH7091
 376         bool "Support SH7091 processor"
 377         select CPU_SH4
 378         help
 379           Select SH7091 if you have an SH-4 based Sega device (such as
 380           the Dreamcast, Naomi, and Naomi 2).
 381
 382 config CPU_SUBTYPE_SH7750R
 383         bool "Support SH7750R processor"
 384         select CPU_SH4
 385
 386 config CPU_SUBTYPE_SH7750S
 387         bool "Support SH7750S processor"
 388         select CPU_SH4
 389
 390 config CPU_SUBTYPE_SH7751
 391         bool "Support SH7751 processor"
 392         select CPU_SH4
 393         help
 394           Select SH7751 if you have a 166 Mhz SH-4 HD6417751 CPU,
 395           or if you have a HD6417751R CPU.
 396
 397 config CPU_SUBTYPE_SH7751R
 398         bool "Support SH7751R processor"
 399         select CPU_SH4
 400
 401 config CPU_SUBTYPE_SH7760
 402         bool "Support SH7760 processor"
 403         select CPU_SH4
 404
 405 config CPU_SUBTYPE_SH4_202
 406         bool "Support SH4-202 processor"
 407         select CPU_SH4
 408
 409 # SH-4A Processor Support
 410
 411 config CPU_SUBTYPE_SH7723
 412         bool "Support SH7723 processor"
 413         select CPU_SH4A
 414         select CPU_SHX2
 415         select ARCH_SHMOBILE
 416         select ARCH_SPARSEMEM_ENABLE
 417         select SYS_SUPPORTS_SH_CMT
 418         select PINCTRL
 419         help
 420           Select SH7723 if you have an SH-MobileR2 CPU.
 421
 422 config CPU_SUBTYPE_SH7724
 423         bool "Support SH7724 processor"
 424         select CPU_SH4A
 425         select CPU_SHX2
 426         select ARCH_SHMOBILE
 427         select ARCH_SPARSEMEM_ENABLE
 428         select SYS_SUPPORTS_SH_CMT
 429         select PINCTRL
 430         help
 431           Select SH7724 if you have an SH-MobileR2R CPU.
 432
 433 config CPU_SUBTYPE_SH7734
 434         bool "Support SH7734 processor"
 435         select CPU_SH4A
 436         select CPU_SHX2
 437         select PINCTRL
 438         help
 439           Select SH7734 if you have a SH4A SH7734 CPU.
 440
 441 config CPU_SUBTYPE_SH7757
 442         bool "Support SH7757 processor"
 443         select CPU_SH4A
 444         select CPU_SHX2
 445         select PINCTRL
 446         help
 447           Select SH7757 if you have a SH4A SH7757 CPU.
 448
 449 config CPU_SUBTYPE_SH7763
 450         bool "Support SH7763 processor"
 451         select CPU_SH4A
 452         select USB_OHCI_SH if USB_OHCI_HCD
 453         help
 454           Select SH7763 if you have a SH4A SH7763(R5S77631) CPU.
 455
 456 config CPU_SUBTYPE_SH7770
 457         bool "Support SH7770 processor"
 458         select CPU_SH4A
 459
 460 config CPU_SUBTYPE_SH7780
 461         bool "Support SH7780 processor"
 462         select CPU_SH4A
 463
 464 config CPU_SUBTYPE_SH7785
 465         bool "Support SH7785 processor"
 466         select CPU_SH4A
 467         select CPU_SHX2
 468         select ARCH_SPARSEMEM_ENABLE
 469         select SYS_SUPPORTS_NUMA
 470         select PINCTRL
 471
 472 config CPU_SUBTYPE_SH7786
 473         bool "Support SH7786 processor"
 474         select CPU_SH4A
 475         select CPU_SHX3
 476         select CPU_HAS_PTEAEX
 477         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 478         select USB_OHCI_SH if USB_OHCI_HCD
 479         select USB_EHCI_SH if USB_EHCI_HCD
 480         select PINCTRL
 481
 482 config CPU_SUBTYPE_SHX3
 483         bool "Support SH-X3 processor"
 484         select CPU_SH4A
 485         select CPU_SHX3
 486         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 487         select GPIOLIB
 488         select PINCTRL
 489
 490 # SH4AL-DSP Processor Support
 491
 492 config CPU_SUBTYPE_SH7343
 493         bool "Support SH7343 processor"
 494         select CPU_SH4AL_DSP
 495         select ARCH_SHMOBILE
 496         select SYS_SUPPORTS_SH_CMT
 497
 498 config CPU_SUBTYPE_SH7722
 499         bool "Support SH7722 processor"
 500         select CPU_SH4AL_DSP
 501         select CPU_SHX2
 502         select ARCH_SHMOBILE
 503         select ARCH_SPARSEMEM_ENABLE
 504         select SYS_SUPPORTS_NUMA
 505         select SYS_SUPPORTS_SH_CMT
 506         select PINCTRL
 507
 508 config CPU_SUBTYPE_SH7366
 509         bool "Support SH7366 processor"
 510         select CPU_SH4AL_DSP
 511         select CPU_SHX2
 512         select ARCH_SHMOBILE
 513         select ARCH_SPARSEMEM_ENABLE
 514         select SYS_SUPPORTS_NUMA
 515         select SYS_SUPPORTS_SH_CMT
 516
 517 endchoice
 518
 519 endif
 520
 521 if SUPERH64
 522
 523 choice
 524         prompt "Processor sub-type selection"
 525
 526 # SH-5 Processor Support
 527
 528 config CPU_SUBTYPE_SH5_101
 529         bool "Support SH5-101 processor"
 530         select CPU_SH5
 531
 532 config CPU_SUBTYPE_SH5_103
 533         bool "Support SH5-103 processor"
 534         select CPU_SH5
 535
 536 endchoice
 537
 538 endif
 539
 540 source "arch/sh/mm/Kconfig"
 541
 542 source "arch/sh/Kconfig.cpu"
 543
 544 source "arch/sh/boards/Kconfig"
 545
 546 menu "Timer and clock configuration"
 547
 548 config SH_PCLK_FREQ
 549         int "Peripheral clock frequency (in Hz)"
 550         depends on SH_CLK_CPG_LEGACY
 551         default "31250000" if CPU_SUBTYPE_SH7619
 552         default "33333333" if CPU_SUBTYPE_SH7770 || \
 553                               CPU_SUBTYPE_SH7760 || \
 554                               CPU_SUBTYPE_SH7705 || \
 555                               CPU_SUBTYPE_SH7203 || \
 556                               CPU_SUBTYPE_SH7206 || \
 557                               CPU_SUBTYPE_SH7263 || \
 558                               CPU_SUBTYPE_MXG
 559         default "60000000" if CPU_SUBTYPE_SH7751 || CPU_SUBTYPE_SH7751R
 560         default "66000000" if CPU_SUBTYPE_SH4_202
 561         default "50000000"
 562         help
 563           This option is used to specify the peripheral clock frequency.
 564           This is necessary for determining the reference clock value on
 565           platforms lacking an RTC.
 566
 567 config SH_CLK_CPG
 568         def_bool y
 569
 570 config SH_CLK_CPG_LEGACY
 571         depends on SH_CLK_CPG
 572         def_bool y if !CPU_SUBTYPE_SH7785 && !ARCH_SHMOBILE && \
 573                       !CPU_SHX3 && !CPU_SUBTYPE_SH7757 && \
 574                       !CPU_SUBTYPE_SH7734 && !CPU_SUBTYPE_SH7264 && \
 575                       !CPU_SUBTYPE_SH7269
 576
 577 endmenu
 578
 579 menu "CPU Frequency scaling"
 580 source "drivers/cpufreq/Kconfig"
 581 endmenu
 582
 583 source "arch/sh/drivers/Kconfig"
 584
 585 endmenu
 586
 587 menu "Kernel features"
 588
 589 source "kernel/Kconfig.hz"
 590
 591 config KEXEC
 592         bool "kexec system call (EXPERIMENTAL)"
 593         depends on SUPERH32 && MMU
 594         select KEXEC_CORE
 595         help
 596           kexec is a system call that implements the ability to shutdown your
 597           current kernel, and to start another kernel.  It is like a reboot
 598           but it is independent of the system firmware.  And like a reboot
 599           you can start any kernel with it, not just Linux.
 600
 601           The name comes from the similarity to the exec system call.
 602
 603           It is an ongoing process to be certain the hardware in a machine
 604           is properly shutdown, so do not be surprised if this code does not
 605           initially work for you.  As of this writing the exact hardware
 606           interface is strongly in flux, so no good recommendation can be
 607           made.
 608
 609 config CRASH_DUMP
 610         bool "kernel crash dumps (EXPERIMENTAL)"
 611         depends on SUPERH32 && BROKEN_ON_SMP
 612         help
 613           Generate crash dump after being started by kexec.
 614           This should be normally only set in special crash dump kernels
 615           which are loaded in the main kernel with kexec-tools into
 616           a specially reserved region and then later executed after
 617           a crash by kdump/kexec. The crash dump kernel must be compiled
 618           to a memory address not used by the main kernel using
 619           PHYSICAL_START.
 620
 621           For more details see Documentation/admin-guide/kdump/kdump.rst
 622
 623 config KEXEC_JUMP
 624         bool "kexec jump (EXPERIMENTAL)"
 625         depends on SUPERH32 && KEXEC && HIBERNATION
 626         help
 627           Jump between original kernel and kexeced kernel and invoke
 628           code via KEXEC
 629
 630 config PHYSICAL_START
 631         hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
 632         default MEMORY_START
 633         ---help---
 634           This gives the physical address where the kernel is loaded
 635           and is ordinarily the same as MEMORY_START.
 636
 637           Different values are primarily used in the case of kexec on panic
 638           where the fail safe kernel needs to run at a different address
 639           than the panic-ed kernel.
 640
 641 config SECCOMP
 642         bool "Enable seccomp to safely compute untrusted bytecode"
 643         depends on PROC_FS
 644         help
 645           This kernel feature is useful for number crunching applications
 646           that may need to compute untrusted bytecode during their
 647           execution. By using pipes or other transports made available to
 648           the process as file descriptors supporting the read/write
 649           syscalls, it's possible to isolate those applications in
 650           their own address space using seccomp. Once seccomp is
 651           enabled via prctl, it cannot be disabled and the task is only
 652           allowed to execute a few safe syscalls defined by each seccomp
 653           mode.
 654
 655           If unsure, say N.
 656
 657 config SMP
 658         bool "Symmetric multi-processing support"
 659         depends on SYS_SUPPORTS_SMP
 660         ---help---
 661           This enables support for systems with more than one CPU. If you have
 662           a system with only one CPU, say N. If you have a system with more
 663           than one CPU, say Y.
 664
 665           If you say N here, the kernel will run on uni- and multiprocessor
 666           machines, but will use only one CPU of a multiprocessor machine. If
 667           you say Y here, the kernel will run on many, but not all,
 668           uniprocessor machines. On a uniprocessor machine, the kernel
 669           will run faster if you say N here.
 670
 671           People using multiprocessor machines who say Y here should also say
 672           Y to "Enhanced Real Time Clock Support", below.
 673
 674           See also <file:Documentation/admin-guide/lockup-watchdogs.rst> and the SMP-HOWTO
 675           available at <http://www.tldp.org/docs.html#howto>.
 676
 677           If you don't know what to do here, say N.
 678
 679 config NR_CPUS
 680         int "Maximum number of CPUs (2-32)"
 681         range 2 32
 682         depends on SMP
 683         default "4" if CPU_SUBTYPE_SHX3
 684         default "2"
 685         help
 686           This allows you to specify the maximum number of CPUs which this
 687           kernel will support.  The maximum supported value is 32 and the
 688           minimum value which makes sense is 2.
 689
 690           This is purely to save memory - each supported CPU adds
 691           approximately eight kilobytes to the kernel image.
 692
 693 config HOTPLUG_CPU
 694         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 695         depends on SMP
 696         help
 697           Say Y here to experiment with turning CPUs off and on.  CPUs
 698           can be controlled through /sys/devices/system/cpu.
 699
 700 config GUSA
 701         def_bool y
 702         depends on !SMP && SUPERH32
 703         help
 704           This enables support for gUSA (general UserSpace Atomicity).
 705           This is the default implementation for both UP and non-ll/sc
 706           CPUs, and is used by the libc, amongst others.
 707
 708           For additional information, design information can be found
 709           in <http://lc.linux.or.jp/lc2002/papers/niibe0919p.pdf>.
 710
 711           This should only be disabled for special cases where alternate
 712           atomicity implementations exist.
 713
 714 config GUSA_RB
 715         bool "Implement atomic operations by roll-back (gRB) (EXPERIMENTAL)"
 716         depends on GUSA && CPU_SH3 || (CPU_SH4 && !CPU_SH4A)
 717         help
 718           Enabling this option will allow the kernel to implement some
 719           atomic operations using a software implementation of load-locked/
 720           store-conditional (LLSC). On machines which do not have hardware
 721           LLSC, this should be more efficient than the other alternative of
 722           disabling interrupts around the atomic sequence.
 723
 724 config HW_PERF_EVENTS
 725         bool "Enable hardware performance counter support for perf events"
 726         depends on PERF_EVENTS && CPU_HAS_PMU
 727         default y
 728         help
 729           Enable hardware performance counter support for perf events. If
 730           disabled, perf events will use software events only.
 731
 732 source "drivers/sh/Kconfig"
 733
 734 endmenu
 735
 736 menu "Boot options"
 737
 738 config USE_BUILTIN_DTB
 739         bool "Use builtin DTB"
 740         default n
 741         depends on SH_DEVICE_TREE
 742         help
 743           Link a device tree blob for particular hardware into the kernel,
 744           suppressing use of the DTB pointer provided by the bootloader.
 745           This option should only be used with legacy bootloaders that are
 746           not capable of providing a DTB to the kernel, or for experimental
 747           hardware without stable device tree bindings.
 748
 749 config BUILTIN_DTB_SOURCE
 750         string "Source file for builtin DTB"
 751         default ""
 752         depends on USE_BUILTIN_DTB
 753         help
 754           Base name (without suffix, relative to arch/sh/boot/dts) for the
 755           a DTS file that will be used to produce the DTB linked into the
 756           kernel.
 757
 758 config ZERO_PAGE_OFFSET
 759         hex
 760         default "0x00010000" if PAGE_SIZE_64KB || SH_RTS7751R2D || \
 761                                 SH_7751_SOLUTION_ENGINE
 762         default "0x00004000" if PAGE_SIZE_16KB || SH_SH03
 763         default "0x00002000" if PAGE_SIZE_8KB
 764         default "0x00001000"
 765         help
 766           This sets the default offset of zero page.
 767
 768 config BOOT_LINK_OFFSET
 769         hex
 770         default "0x00210000" if SH_SHMIN
 771         default "0x00400000" if SH_CAYMAN
 772         default "0x00810000" if SH_7780_SOLUTION_ENGINE
 773         default "0x009e0000" if SH_TITAN
 774         default "0x01800000" if SH_SDK7780
 775         default "0x02000000" if SH_EDOSK7760
 776         default "0x00800000"
 777         help
 778           This option allows you to set the link address offset of the zImage.
 779           This can be useful if you are on a board which has a small amount of
 780           memory.
 781
 782 config ENTRY_OFFSET
 783         hex
 784         default "0x00001000" if PAGE_SIZE_4KB
 785         default "0x00002000" if PAGE_SIZE_8KB
 786         default "0x00004000" if PAGE_SIZE_16KB
 787         default "0x00010000" if PAGE_SIZE_64KB
 788         default "0x00000000"
 789
 790 config ROMIMAGE_MMCIF
 791         bool "Include MMCIF loader in romImage (EXPERIMENTAL)"
 792         depends on CPU_SUBTYPE_SH7724
 793         help
 794           Say Y here to include experimental MMCIF loading code in
 795           romImage. With this enabled it is possible to write the romImage
 796           kernel image to an MMC card and boot the kernel straight from
 797           the reset vector. At reset the processor Mask ROM will load the
 798           first part of the romImage which in turn loads the rest the kernel
 799           image to RAM using the MMCIF hardware block.
 800
 801 choice
 802         prompt "Kernel command line"
 803         optional
 804         default CMDLINE_OVERWRITE
 805         help
 806           Setting this option allows the kernel command line arguments
 807           to be set.
 808
 809 config CMDLINE_OVERWRITE
 810         bool "Overwrite bootloader kernel arguments"
 811         help
 812           Given string will overwrite any arguments passed in by
 813           a bootloader.
 814
 815 config CMDLINE_EXTEND
 816         bool "Extend bootloader kernel arguments"
 817         help
 818           Given string will be concatenated with arguments passed in
 819           by a bootloader.
 820
 821 endchoice
 822
 823 config CMDLINE
 824         string "Kernel command line arguments string"
 825         depends on CMDLINE_OVERWRITE || CMDLINE_EXTEND
 826         default "console=ttySC1,115200"
 827
 828 endmenu
 829
 830 menu "Bus options"
 831
 832 config SUPERHYWAY
 833         tristate "SuperHyway Bus support"
 834         depends on CPU_SUBTYPE_SH4_202
 835
 836 config MAPLE
 837         bool "Maple Bus support"
 838         depends on SH_DREAMCAST
 839         help
 840          The Maple Bus is SEGA's serial communication bus for peripherals
 841          on the Dreamcast. Without this bus support you won't be able to
 842          get your Dreamcast keyboard etc to work, so most users
 843          probably want to say 'Y' here, unless you are only using the
 844          Dreamcast with a serial line terminal or a remote network
 845          connection.
 846
 847 endmenu
 848
 849 menu "Power management options (EXPERIMENTAL)"
 850
 851 source "kernel/power/Kconfig"
 852
 853 source "drivers/cpuidle/Kconfig"
 854
 855 endmenu