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         select ARCH_32BIT_OFF_T
  57         select GUP_GET_PTE_LOW_HIGH if X2TLB
  58         select HAVE_KPROBES
  59         select HAVE_KRETPROBES
  60         select HAVE_IOREMAP_PROT if MMU && !X2TLB
  61         select HAVE_FUNCTION_TRACER
  62         select HAVE_FTRACE_MCOUNT_RECORD
  63         select HAVE_DYNAMIC_FTRACE
  64         select ARCH_WANT_IPC_PARSE_VERSION
  65         select HAVE_FUNCTION_GRAPH_TRACER
  66         select HAVE_ARCH_KGDB
  67         select HAVE_HW_BREAKPOINT
  68         select HAVE_MIXED_BREAKPOINTS_REGS
  69         select PERF_EVENTS
  70         select ARCH_HIBERNATION_POSSIBLE if MMU
  71         select SPARSE_IRQ
  72         select HAVE_STACKPROTECTOR
  73         help
  74           The SuperH is a RISC processor targeted for use in embedded systems
  75           and consumer electronics; it was also used in the Sega Dreamcast
  76           gaming console.  The SuperH port has a home page at
  77           <http://www.linux-sh.org/>.
  78
  79 config GENERIC_BUG
  80         def_bool y
  81         depends on BUG
  82
  83 config GENERIC_HWEIGHT
  84         def_bool y
  85
  86 config GENERIC_CALIBRATE_DELAY
  87         bool
  88
  89 config GENERIC_LOCKBREAK
  90         def_bool y
  91         depends on SMP && PREEMPTION
  92
  93 config ARCH_SUSPEND_POSSIBLE
  94         def_bool n
  95
  96 config ARCH_HIBERNATION_POSSIBLE
  97         def_bool n
  98
  99 config SYS_SUPPORTS_APM_EMULATION
 100         bool
 101         select ARCH_SUSPEND_POSSIBLE
 102
 103 config SYS_SUPPORTS_HUGETLBFS
 104         bool
 105
 106 config SYS_SUPPORTS_SMP
 107         bool
 108
 109 config SYS_SUPPORTS_NUMA
 110         bool
 111
 112 config STACKTRACE_SUPPORT
 113         def_bool y
 114
 115 config LOCKDEP_SUPPORT
 116         def_bool y
 117
 118 config ARCH_HAS_ILOG2_U32
 119         def_bool n
 120
 121 config ARCH_HAS_ILOG2_U64
 122         def_bool n
 123
 124 config NO_IOPORT_MAP
 125         def_bool !PCI
 126         depends on !SH_CAYMAN && !SH_SH4202_MICRODEV && !SH_SHMIN && \
 127                    !SH_HP6XX && !SH_SOLUTION_ENGINE
 128
 129 config IO_TRAPPED
 130         bool
 131
 132 config SWAP_IO_SPACE
 133         bool
 134
 135 config DMA_COHERENT
 136         bool
 137
 138 config DMA_NONCOHERENT
 139         def_bool !DMA_COHERENT
 140         select ARCH_HAS_SYNC_DMA_FOR_DEVICE
 141
 142 config PGTABLE_LEVELS
 143         default 3 if X2TLB
 144         default 2
 145
 146 menu "System type"
 147
 148 #
 149 # Processor families
 150 #
 151 config CPU_SH2
 152         bool
 153         select SH_INTC
 154
 155 config CPU_SH2A
 156         bool
 157         select CPU_SH2
 158         select UNCACHED_MAPPING
 159
 160 config CPU_J2
 161         bool
 162         select CPU_SH2
 163         select OF
 164         select OF_EARLY_FLATTREE
 165
 166 config CPU_SH3
 167         bool
 168         select CPU_HAS_INTEVT
 169         select CPU_HAS_SR_RB
 170         select SH_INTC
 171         select SYS_SUPPORTS_SH_TMU
 172
 173 config CPU_SH4
 174         bool
 175         select CPU_HAS_INTEVT
 176         select CPU_HAS_SR_RB
 177         select CPU_HAS_FPU if !CPU_SH4AL_DSP
 178         select SH_INTC
 179         select SYS_SUPPORTS_SH_TMU
 180         select SYS_SUPPORTS_HUGETLBFS if MMU
 181
 182 config CPU_SH4A
 183         bool
 184         select CPU_SH4
 185
 186 config CPU_SH4AL_DSP
 187         bool
 188         select CPU_SH4A
 189         select CPU_HAS_DSP
 190
 191 config CPU_SHX2
 192         bool
 193
 194 config CPU_SHX3
 195         bool
 196         select DMA_COHERENT
 197         select SYS_SUPPORTS_SMP
 198         select SYS_SUPPORTS_NUMA
 199
 200 config ARCH_SHMOBILE
 201         bool
 202         select ARCH_SUSPEND_POSSIBLE
 203         select PM
 204
 205 config CPU_HAS_PMU
 206        depends on CPU_SH4 || CPU_SH4A
 207        default y
 208        bool
 209
 210 choice
 211         prompt "Processor sub-type selection"
 212
 213 #
 214 # Processor subtypes
 215 #
 216
 217 # SH-2 Processor Support
 218
 219 config CPU_SUBTYPE_SH7619
 220         bool "Support SH7619 processor"
 221         select CPU_SH2
 222         select SYS_SUPPORTS_SH_CMT
 223
 224 config CPU_SUBTYPE_J2
 225         bool "Support J2 processor"
 226         select CPU_J2
 227         select SYS_SUPPORTS_SMP
 228         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 229
 230 # SH-2A Processor Support
 231
 232 config CPU_SUBTYPE_SH7201
 233         bool "Support SH7201 processor"
 234         select CPU_SH2A
 235         select CPU_HAS_FPU
 236         select SYS_SUPPORTS_SH_MTU2
 237
 238 config CPU_SUBTYPE_SH7203
 239         bool "Support SH7203 processor"
 240         select CPU_SH2A
 241         select CPU_HAS_FPU
 242         select SYS_SUPPORTS_SH_CMT
 243         select SYS_SUPPORTS_SH_MTU2
 244         select PINCTRL
 245
 246 config CPU_SUBTYPE_SH7206
 247         bool "Support SH7206 processor"
 248         select CPU_SH2A
 249         select SYS_SUPPORTS_SH_CMT
 250         select SYS_SUPPORTS_SH_MTU2
 251
 252 config CPU_SUBTYPE_SH7263
 253         bool "Support SH7263 processor"
 254         select CPU_SH2A
 255         select CPU_HAS_FPU
 256         select SYS_SUPPORTS_SH_CMT
 257         select SYS_SUPPORTS_SH_MTU2
 258
 259 config CPU_SUBTYPE_SH7264
 260         bool "Support SH7264 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_SH7269
 268         bool "Support SH7269 processor"
 269         select CPU_SH2A
 270         select CPU_HAS_FPU
 271         select SYS_SUPPORTS_SH_CMT
 272         select SYS_SUPPORTS_SH_MTU2
 273         select PINCTRL
 274
 275 config CPU_SUBTYPE_MXG
 276         bool "Support MX-G processor"
 277         select CPU_SH2A
 278         select SYS_SUPPORTS_SH_MTU2
 279         help
 280           Select MX-G if running on an R8A03022BG part.
 281
 282 # SH-3 Processor Support
 283
 284 config CPU_SUBTYPE_SH7705
 285         bool "Support SH7705 processor"
 286         select CPU_SH3
 287
 288 config CPU_SUBTYPE_SH7706
 289         bool "Support SH7706 processor"
 290         select CPU_SH3
 291         help
 292           Select SH7706 if you have a 133 Mhz SH-3 HD6417706 CPU.
 293
 294 config CPU_SUBTYPE_SH7707
 295         bool "Support SH7707 processor"
 296         select CPU_SH3
 297         help
 298           Select SH7707 if you have a  60 Mhz SH-3 HD6417707 CPU.
 299
 300 config CPU_SUBTYPE_SH7708
 301         bool "Support SH7708 processor"
 302         select CPU_SH3
 303         help
 304           Select SH7708 if you have a  60 Mhz SH-3 HD6417708S or
 305           if you have a 100 Mhz SH-3 HD6417708R CPU.
 306
 307 config CPU_SUBTYPE_SH7709
 308         bool "Support SH7709 processor"
 309         select CPU_SH3
 310         help
 311           Select SH7709 if you have a  80 Mhz SH-3 HD6417709 CPU.
 312
 313 config CPU_SUBTYPE_SH7710
 314         bool "Support SH7710 processor"
 315         select CPU_SH3
 316         select CPU_HAS_DSP
 317         help
 318           Select SH7710 if you have a SH3-DSP SH7710 CPU.
 319
 320 config CPU_SUBTYPE_SH7712
 321         bool "Support SH7712 processor"
 322         select CPU_SH3
 323         select CPU_HAS_DSP
 324         help
 325           Select SH7712 if you have a SH3-DSP SH7712 CPU.
 326
 327 config CPU_SUBTYPE_SH7720
 328         bool "Support SH7720 processor"
 329         select CPU_SH3
 330         select CPU_HAS_DSP
 331         select SYS_SUPPORTS_SH_CMT
 332         select USB_OHCI_SH if USB_OHCI_HCD
 333         select PINCTRL
 334         help
 335           Select SH7720 if you have a SH3-DSP SH7720 CPU.
 336
 337 config CPU_SUBTYPE_SH7721
 338         bool "Support SH7721 processor"
 339         select CPU_SH3
 340         select CPU_HAS_DSP
 341         select SYS_SUPPORTS_SH_CMT
 342         select USB_OHCI_SH if USB_OHCI_HCD
 343         help
 344           Select SH7721 if you have a SH3-DSP SH7721 CPU.
 345
 346 # SH-4 Processor Support
 347
 348 config CPU_SUBTYPE_SH7750
 349         bool "Support SH7750 processor"
 350         select CPU_SH4
 351         help
 352           Select SH7750 if you have a 200 Mhz SH-4 HD6417750 CPU.
 353
 354 config CPU_SUBTYPE_SH7091
 355         bool "Support SH7091 processor"
 356         select CPU_SH4
 357         help
 358           Select SH7091 if you have an SH-4 based Sega device (such as
 359           the Dreamcast, Naomi, and Naomi 2).
 360
 361 config CPU_SUBTYPE_SH7750R
 362         bool "Support SH7750R processor"
 363         select CPU_SH4
 364
 365 config CPU_SUBTYPE_SH7750S
 366         bool "Support SH7750S processor"
 367         select CPU_SH4
 368
 369 config CPU_SUBTYPE_SH7751
 370         bool "Support SH7751 processor"
 371         select CPU_SH4
 372         help
 373           Select SH7751 if you have a 166 Mhz SH-4 HD6417751 CPU,
 374           or if you have a HD6417751R CPU.
 375
 376 config CPU_SUBTYPE_SH7751R
 377         bool "Support SH7751R processor"
 378         select CPU_SH4
 379
 380 config CPU_SUBTYPE_SH7760
 381         bool "Support SH7760 processor"
 382         select CPU_SH4
 383
 384 config CPU_SUBTYPE_SH4_202
 385         bool "Support SH4-202 processor"
 386         select CPU_SH4
 387
 388 # SH-4A Processor Support
 389
 390 config CPU_SUBTYPE_SH7723
 391         bool "Support SH7723 processor"
 392         select CPU_SH4A
 393         select CPU_SHX2
 394         select ARCH_SHMOBILE
 395         select ARCH_SPARSEMEM_ENABLE
 396         select SYS_SUPPORTS_SH_CMT
 397         select PINCTRL
 398         help
 399           Select SH7723 if you have an SH-MobileR2 CPU.
 400
 401 config CPU_SUBTYPE_SH7724
 402         bool "Support SH7724 processor"
 403         select CPU_SH4A
 404         select CPU_SHX2
 405         select ARCH_SHMOBILE
 406         select ARCH_SPARSEMEM_ENABLE
 407         select SYS_SUPPORTS_SH_CMT
 408         select PINCTRL
 409         help
 410           Select SH7724 if you have an SH-MobileR2R CPU.
 411
 412 config CPU_SUBTYPE_SH7734
 413         bool "Support SH7734 processor"
 414         select CPU_SH4A
 415         select CPU_SHX2
 416         select PINCTRL
 417         help
 418           Select SH7734 if you have a SH4A SH7734 CPU.
 419
 420 config CPU_SUBTYPE_SH7757
 421         bool "Support SH7757 processor"
 422         select CPU_SH4A
 423         select CPU_SHX2
 424         select PINCTRL
 425         help
 426           Select SH7757 if you have a SH4A SH7757 CPU.
 427
 428 config CPU_SUBTYPE_SH7763
 429         bool "Support SH7763 processor"
 430         select CPU_SH4A
 431         select USB_OHCI_SH if USB_OHCI_HCD
 432         help
 433           Select SH7763 if you have a SH4A SH7763(R5S77631) CPU.
 434
 435 config CPU_SUBTYPE_SH7770
 436         bool "Support SH7770 processor"
 437         select CPU_SH4A
 438
 439 config CPU_SUBTYPE_SH7780
 440         bool "Support SH7780 processor"
 441         select CPU_SH4A
 442
 443 config CPU_SUBTYPE_SH7785
 444         bool "Support SH7785 processor"
 445         select CPU_SH4A
 446         select CPU_SHX2
 447         select ARCH_SPARSEMEM_ENABLE
 448         select SYS_SUPPORTS_NUMA
 449         select PINCTRL
 450
 451 config CPU_SUBTYPE_SH7786
 452         bool "Support SH7786 processor"
 453         select CPU_SH4A
 454         select CPU_SHX3
 455         select CPU_HAS_PTEAEX
 456         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 457         select USB_OHCI_SH if USB_OHCI_HCD
 458         select USB_EHCI_SH if USB_EHCI_HCD
 459         select PINCTRL
 460
 461 config CPU_SUBTYPE_SHX3
 462         bool "Support SH-X3 processor"
 463         select CPU_SH4A
 464         select CPU_SHX3
 465         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 466         select GPIOLIB
 467         select PINCTRL
 468
 469 # SH4AL-DSP Processor Support
 470
 471 config CPU_SUBTYPE_SH7343
 472         bool "Support SH7343 processor"
 473         select CPU_SH4AL_DSP
 474         select ARCH_SHMOBILE
 475         select SYS_SUPPORTS_SH_CMT
 476
 477 config CPU_SUBTYPE_SH7722
 478         bool "Support SH7722 processor"
 479         select CPU_SH4AL_DSP
 480         select CPU_SHX2
 481         select ARCH_SHMOBILE
 482         select ARCH_SPARSEMEM_ENABLE
 483         select SYS_SUPPORTS_NUMA
 484         select SYS_SUPPORTS_SH_CMT
 485         select PINCTRL
 486
 487 config CPU_SUBTYPE_SH7366
 488         bool "Support SH7366 processor"
 489         select CPU_SH4AL_DSP
 490         select CPU_SHX2
 491         select ARCH_SHMOBILE
 492         select ARCH_SPARSEMEM_ENABLE
 493         select SYS_SUPPORTS_NUMA
 494         select SYS_SUPPORTS_SH_CMT
 495
 496 endchoice
 497
 498 source "arch/sh/mm/Kconfig"
 499
 500 source "arch/sh/Kconfig.cpu"
 501
 502 source "arch/sh/boards/Kconfig"
 503
 504 menu "Timer and clock configuration"
 505
 506 config SH_PCLK_FREQ
 507         int "Peripheral clock frequency (in Hz)"
 508         depends on SH_CLK_CPG_LEGACY
 509         default "31250000" if CPU_SUBTYPE_SH7619
 510         default "33333333" if CPU_SUBTYPE_SH7770 || \
 511                               CPU_SUBTYPE_SH7760 || \
 512                               CPU_SUBTYPE_SH7705 || \
 513                               CPU_SUBTYPE_SH7203 || \
 514                               CPU_SUBTYPE_SH7206 || \
 515                               CPU_SUBTYPE_SH7263 || \
 516                               CPU_SUBTYPE_MXG
 517         default "60000000" if CPU_SUBTYPE_SH7751 || CPU_SUBTYPE_SH7751R
 518         default "66000000" if CPU_SUBTYPE_SH4_202
 519         default "50000000"
 520         help
 521           This option is used to specify the peripheral clock frequency.
 522           This is necessary for determining the reference clock value on
 523           platforms lacking an RTC.
 524
 525 config SH_CLK_CPG
 526         def_bool y
 527
 528 config SH_CLK_CPG_LEGACY
 529         depends on SH_CLK_CPG
 530         def_bool y if !CPU_SUBTYPE_SH7785 && !ARCH_SHMOBILE && \
 531                       !CPU_SHX3 && !CPU_SUBTYPE_SH7757 && \
 532                       !CPU_SUBTYPE_SH7734 && !CPU_SUBTYPE_SH7264 && \
 533                       !CPU_SUBTYPE_SH7269
 534
 535 endmenu
 536
 537 menu "CPU Frequency scaling"
 538 source "drivers/cpufreq/Kconfig"
 539 endmenu
 540
 541 source "arch/sh/drivers/Kconfig"
 542
 543 endmenu
 544
 545 menu "Kernel features"
 546
 547 source "kernel/Kconfig.hz"
 548
 549 config KEXEC
 550         bool "kexec system call (EXPERIMENTAL)"
 551         depends on MMU
 552         select KEXEC_CORE
 553         help
 554           kexec is a system call that implements the ability to shutdown your
 555           current kernel, and to start another kernel.  It is like a reboot
 556           but it is independent of the system firmware.  And like a reboot
 557           you can start any kernel with it, not just Linux.
 558
 559           The name comes from the similarity to the exec system call.
 560
 561           It is an ongoing process to be certain the hardware in a machine
 562           is properly shutdown, so do not be surprised if this code does not
 563           initially work for you.  As of this writing the exact hardware
 564           interface is strongly in flux, so no good recommendation can be
 565           made.
 566
 567 config CRASH_DUMP
 568         bool "kernel crash dumps (EXPERIMENTAL)"
 569         depends on BROKEN_ON_SMP
 570         help
 571           Generate crash dump after being started by kexec.
 572           This should be normally only set in special crash dump kernels
 573           which are loaded in the main kernel with kexec-tools into
 574           a specially reserved region and then later executed after
 575           a crash by kdump/kexec. The crash dump kernel must be compiled
 576           to a memory address not used by the main kernel using
 577           PHYSICAL_START.
 578
 579           For more details see Documentation/admin-guide/kdump/kdump.rst
 580
 581 config KEXEC_JUMP
 582         bool "kexec jump (EXPERIMENTAL)"
 583         depends on KEXEC && HIBERNATION
 584         help
 585           Jump between original kernel and kexeced kernel and invoke
 586           code via KEXEC
 587
 588 config PHYSICAL_START
 589         hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
 590         default MEMORY_START
 591         help
 592           This gives the physical address where the kernel is loaded
 593           and is ordinarily the same as MEMORY_START.
 594
 595           Different values are primarily used in the case of kexec on panic
 596           where the fail safe kernel needs to run at a different address
 597           than the panic-ed kernel.
 598
 599 config SECCOMP
 600         bool "Enable seccomp to safely compute untrusted bytecode"
 601         depends on PROC_FS
 602         help
 603           This kernel feature is useful for number crunching applications
 604           that may need to compute untrusted bytecode during their
 605           execution. By using pipes or other transports made available to
 606           the process as file descriptors supporting the read/write
 607           syscalls, it's possible to isolate those applications in
 608           their own address space using seccomp. Once seccomp is
 609           enabled via prctl, it cannot be disabled and the task is only
 610           allowed to execute a few safe syscalls defined by each seccomp
 611           mode.
 612
 613           If unsure, say N.
 614
 615 config SMP
 616         bool "Symmetric multi-processing support"
 617         depends on SYS_SUPPORTS_SMP
 618         help
 619           This enables support for systems with more than one CPU. If you have
 620           a system with only one CPU, say N. If you have a system with more
 621           than one CPU, say Y.
 622
 623           If you say N here, the kernel will run on uni- and multiprocessor
 624           machines, but will use only one CPU of a multiprocessor machine. If
 625           you say Y here, the kernel will run on many, but not all,
 626           uniprocessor machines. On a uniprocessor machine, the kernel
 627           will run faster if you say N here.
 628
 629           People using multiprocessor machines who say Y here should also say
 630           Y to "Enhanced Real Time Clock Support", below.
 631
 632           See also <file:Documentation/admin-guide/lockup-watchdogs.rst> and the SMP-HOWTO
 633           available at <http://www.tldp.org/docs.html#howto>.
 634
 635           If you don't know what to do here, say N.
 636
 637 config NR_CPUS
 638         int "Maximum number of CPUs (2-32)"
 639         range 2 32
 640         depends on SMP
 641         default "4" if CPU_SUBTYPE_SHX3
 642         default "2"
 643         help
 644           This allows you to specify the maximum number of CPUs which this
 645           kernel will support.  The maximum supported value is 32 and the
 646           minimum value which makes sense is 2.
 647
 648           This is purely to save memory - each supported CPU adds
 649           approximately eight kilobytes to the kernel image.
 650
 651 config HOTPLUG_CPU
 652         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 653         depends on SMP
 654         help
 655           Say Y here to experiment with turning CPUs off and on.  CPUs
 656           can be controlled through /sys/devices/system/cpu.
 657
 658 config GUSA
 659         def_bool y
 660         depends on !SMP
 661         help
 662           This enables support for gUSA (general UserSpace Atomicity).
 663           This is the default implementation for both UP and non-ll/sc
 664           CPUs, and is used by the libc, amongst others.
 665
 666           For additional information, design information can be found
 667           in <http://lc.linux.or.jp/lc2002/papers/niibe0919p.pdf>.
 668
 669           This should only be disabled for special cases where alternate
 670           atomicity implementations exist.
 671
 672 config GUSA_RB
 673         bool "Implement atomic operations by roll-back (gRB) (EXPERIMENTAL)"
 674         depends on GUSA && CPU_SH3 || (CPU_SH4 && !CPU_SH4A)
 675         help
 676           Enabling this option will allow the kernel to implement some
 677           atomic operations using a software implementation of load-locked/
 678           store-conditional (LLSC). On machines which do not have hardware
 679           LLSC, this should be more efficient than the other alternative of
 680           disabling interrupts around the atomic sequence.
 681
 682 config HW_PERF_EVENTS
 683         bool "Enable hardware performance counter support for perf events"
 684         depends on PERF_EVENTS && CPU_HAS_PMU
 685         default y
 686         help
 687           Enable hardware performance counter support for perf events. If
 688           disabled, perf events will use software events only.
 689
 690 source "drivers/sh/Kconfig"
 691
 692 endmenu
 693
 694 menu "Boot options"
 695
 696 config USE_BUILTIN_DTB
 697         bool "Use builtin DTB"
 698         default n
 699         depends on SH_DEVICE_TREE
 700         help
 701           Link a device tree blob for particular hardware into the kernel,
 702           suppressing use of the DTB pointer provided by the bootloader.
 703           This option should only be used with legacy bootloaders that are
 704           not capable of providing a DTB to the kernel, or for experimental
 705           hardware without stable device tree bindings.
 706
 707 config BUILTIN_DTB_SOURCE
 708         string "Source file for builtin DTB"
 709         default ""
 710         depends on USE_BUILTIN_DTB
 711         help
 712           Base name (without suffix, relative to arch/sh/boot/dts) for the
 713           a DTS file that will be used to produce the DTB linked into the
 714           kernel.
 715
 716 config ZERO_PAGE_OFFSET
 717         hex
 718         default "0x00010000" if PAGE_SIZE_64KB || SH_RTS7751R2D || \
 719                                 SH_7751_SOLUTION_ENGINE
 720         default "0x00004000" if PAGE_SIZE_16KB || SH_SH03
 721         default "0x00002000" if PAGE_SIZE_8KB
 722         default "0x00001000"
 723         help
 724           This sets the default offset of zero page.
 725
 726 config BOOT_LINK_OFFSET
 727         hex
 728         default "0x00210000" if SH_SHMIN
 729         default "0x00400000" if SH_CAYMAN
 730         default "0x00810000" if SH_7780_SOLUTION_ENGINE
 731         default "0x009e0000" if SH_TITAN
 732         default "0x01800000" if SH_SDK7780
 733         default "0x02000000" if SH_EDOSK7760
 734         default "0x00800000"
 735         help
 736           This option allows you to set the link address offset of the zImage.
 737           This can be useful if you are on a board which has a small amount of
 738           memory.
 739
 740 config ENTRY_OFFSET
 741         hex
 742         default "0x00001000" if PAGE_SIZE_4KB
 743         default "0x00002000" if PAGE_SIZE_8KB
 744         default "0x00004000" if PAGE_SIZE_16KB
 745         default "0x00010000" if PAGE_SIZE_64KB
 746         default "0x00000000"
 747
 748 config ROMIMAGE_MMCIF
 749         bool "Include MMCIF loader in romImage (EXPERIMENTAL)"
 750         depends on CPU_SUBTYPE_SH7724
 751         help
 752           Say Y here to include experimental MMCIF loading code in
 753           romImage. With this enabled it is possible to write the romImage
 754           kernel image to an MMC card and boot the kernel straight from
 755           the reset vector. At reset the processor Mask ROM will load the
 756           first part of the romImage which in turn loads the rest the kernel
 757           image to RAM using the MMCIF hardware block.
 758
 759 choice
 760         prompt "Kernel command line"
 761         optional
 762         default CMDLINE_OVERWRITE
 763         help
 764           Setting this option allows the kernel command line arguments
 765           to be set.
 766
 767 config CMDLINE_OVERWRITE
 768         bool "Overwrite bootloader kernel arguments"
 769         help
 770           Given string will overwrite any arguments passed in by
 771           a bootloader.
 772
 773 config CMDLINE_EXTEND
 774         bool "Extend bootloader kernel arguments"
 775         help
 776           Given string will be concatenated with arguments passed in
 777           by a bootloader.
 778
 779 endchoice
 780
 781 config CMDLINE
 782         string "Kernel command line arguments string"
 783         depends on CMDLINE_OVERWRITE || CMDLINE_EXTEND
 784         default "console=ttySC1,115200"
 785
 786 endmenu
 787
 788 menu "Bus options"
 789
 790 config SUPERHYWAY
 791         tristate "SuperHyway Bus support"
 792         depends on CPU_SUBTYPE_SH4_202
 793
 794 config MAPLE
 795         bool "Maple Bus support"
 796         depends on SH_DREAMCAST
 797         help
 798          The Maple Bus is SEGA's serial communication bus for peripherals
 799          on the Dreamcast. Without this bus support you won't be able to
 800          get your Dreamcast keyboard etc to work, so most users
 801          probably want to say 'Y' here, unless you are only using the
 802          Dreamcast with a serial line terminal or a remote network
 803          connection.
 804
 805 endmenu
 806
 807 menu "Power management options (EXPERIMENTAL)"
 808
 809 source "kernel/power/Kconfig"
 810
 811 source "drivers/cpuidle/Kconfig"
 812
 813 endmenu