1# SPDX-License-Identifier: GPL-2.0 2config ZONE_DMA 3 def_bool y 4 5config XTENSA 6 def_bool y 7 select ARCH_NO_COHERENT_DMA_MMAP if !MMU 8 select ARCH_WANT_FRAME_POINTERS 9 select ARCH_WANT_IPC_PARSE_VERSION 10 select BUILDTIME_EXTABLE_SORT 11 select CLONE_BACKWARDS 12 select COMMON_CLK 13 select GENERIC_ATOMIC64 14 select GENERIC_CLOCKEVENTS 15 select GENERIC_IRQ_SHOW 16 select GENERIC_PCI_IOMAP 17 select GENERIC_SCHED_CLOCK 18 select GENERIC_STRNCPY_FROM_USER if KASAN 19 select HAVE_ARCH_KASAN if MMU 20 select HAVE_DEBUG_KMEMLEAK 21 select HAVE_DMA_CONTIGUOUS 22 select HAVE_EXIT_THREAD 23 select HAVE_FUNCTION_TRACER 24 select HAVE_FUTEX_CMPXCHG if !MMU 25 select HAVE_HW_BREAKPOINT if PERF_EVENTS 26 select HAVE_IRQ_TIME_ACCOUNTING 27 select HAVE_MEMBLOCK 28 select HAVE_OPROFILE 29 select HAVE_PERF_EVENTS 30 select HAVE_STACKPROTECTOR 31 select IRQ_DOMAIN 32 select MODULES_USE_ELF_RELA 33 select NO_BOOTMEM 34 select PERF_USE_VMALLOC 35 select VIRT_TO_BUS 36 help 37 Xtensa processors are 32-bit RISC machines designed by Tensilica 38 primarily for embedded systems. These processors are both 39 configurable and extensible. The Linux port to the Xtensa 40 architecture supports all processor configurations and extensions, 41 with reasonable minimum requirements. The Xtensa Linux project has 42 a home page at <http://www.linux-xtensa.org/>. 43 44config RWSEM_XCHGADD_ALGORITHM 45 def_bool y 46 47config GENERIC_HWEIGHT 48 def_bool y 49 50config ARCH_HAS_ILOG2_U32 51 def_bool n 52 53config ARCH_HAS_ILOG2_U64 54 def_bool n 55 56config NO_IOPORT_MAP 57 def_bool n 58 59config HZ 60 int 61 default 100 62 63source "init/Kconfig" 64source "kernel/Kconfig.freezer" 65 66config LOCKDEP_SUPPORT 67 def_bool y 68 69config STACKTRACE_SUPPORT 70 def_bool y 71 72config TRACE_IRQFLAGS_SUPPORT 73 def_bool y 74 75config MMU 76 def_bool n 77 78config VARIANT_IRQ_SWITCH 79 def_bool n 80 81config HAVE_XTENSA_GPIO32 82 def_bool n 83 84config KASAN_SHADOW_OFFSET 85 hex 86 default 0x6e400000 87 88menu "Processor type and features" 89 90choice 91 prompt "Xtensa Processor Configuration" 92 default XTENSA_VARIANT_FSF 93 94config XTENSA_VARIANT_FSF 95 bool "fsf - default (not generic) configuration" 96 select MMU 97 98config XTENSA_VARIANT_DC232B 99 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)" 100 select MMU 101 select HAVE_XTENSA_GPIO32 102 help 103 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE). 104 105config XTENSA_VARIANT_DC233C 106 bool "dc233c - Diamond 233L Standard Core Rev.C (LE)" 107 select MMU 108 select HAVE_XTENSA_GPIO32 109 help 110 This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE). 111 112config XTENSA_VARIANT_CUSTOM 113 bool "Custom Xtensa processor configuration" 114 select HAVE_XTENSA_GPIO32 115 help 116 Select this variant to use a custom Xtensa processor configuration. 117 You will be prompted for a processor variant CORENAME. 118endchoice 119 120config XTENSA_VARIANT_CUSTOM_NAME 121 string "Xtensa Processor Custom Core Variant Name" 122 depends on XTENSA_VARIANT_CUSTOM 123 help 124 Provide the name of a custom Xtensa processor variant. 125 This CORENAME selects arch/xtensa/variant/CORENAME. 126 Dont forget you have to select MMU if you have one. 127 128config XTENSA_VARIANT_NAME 129 string 130 default "dc232b" if XTENSA_VARIANT_DC232B 131 default "dc233c" if XTENSA_VARIANT_DC233C 132 default "fsf" if XTENSA_VARIANT_FSF 133 default XTENSA_VARIANT_CUSTOM_NAME if XTENSA_VARIANT_CUSTOM 134 135config XTENSA_VARIANT_MMU 136 bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)" 137 depends on XTENSA_VARIANT_CUSTOM 138 default y 139 select MMU 140 help 141 Build a Conventional Kernel with full MMU support, 142 ie: it supports a TLB with auto-loading, page protection. 143 144config XTENSA_VARIANT_HAVE_PERF_EVENTS 145 bool "Core variant has Performance Monitor Module" 146 depends on XTENSA_VARIANT_CUSTOM 147 default n 148 help 149 Enable if core variant has Performance Monitor Module with 150 External Registers Interface. 151 152 If unsure, say N. 153 154config XTENSA_FAKE_NMI 155 bool "Treat PMM IRQ as NMI" 156 depends on XTENSA_VARIANT_HAVE_PERF_EVENTS 157 default n 158 help 159 If PMM IRQ is the only IRQ at EXCM level it is safe to 160 treat it as NMI, which improves accuracy of profiling. 161 162 If there are other interrupts at or above PMM IRQ priority level 163 but not above the EXCM level, PMM IRQ still may be treated as NMI, 164 but only if these IRQs are not used. There will be a build warning 165 saying that this is not safe, and a bugcheck if one of these IRQs 166 actually fire. 167 168 If unsure, say N. 169 170config XTENSA_UNALIGNED_USER 171 bool "Unaligned memory access in use space" 172 help 173 The Xtensa architecture currently does not handle unaligned 174 memory accesses in hardware but through an exception handler. 175 Per default, unaligned memory accesses are disabled in user space. 176 177 Say Y here to enable unaligned memory access in user space. 178 179source "kernel/Kconfig.preempt" 180 181config HAVE_SMP 182 bool "System Supports SMP (MX)" 183 depends on XTENSA_VARIANT_CUSTOM 184 select XTENSA_MX 185 help 186 This option is use to indicate that the system-on-a-chip (SOC) 187 supports Multiprocessing. Multiprocessor support implemented above 188 the CPU core definition and currently needs to be selected manually. 189 190 Multiprocessor support in implemented with external cache and 191 interrupt controllers. 192 193 The MX interrupt distributer adds Interprocessor Interrupts 194 and causes the IRQ numbers to be increased by 4 for devices 195 like the open cores ethernet driver and the serial interface. 196 197 You still have to select "Enable SMP" to enable SMP on this SOC. 198 199config SMP 200 bool "Enable Symmetric multi-processing support" 201 depends on HAVE_SMP 202 select GENERIC_SMP_IDLE_THREAD 203 help 204 Enabled SMP Software; allows more than one CPU/CORE 205 to be activated during startup. 206 207config NR_CPUS 208 depends on SMP 209 int "Maximum number of CPUs (2-32)" 210 range 2 32 211 default "4" 212 213config HOTPLUG_CPU 214 bool "Enable CPU hotplug support" 215 depends on SMP 216 help 217 Say Y here to allow turning CPUs off and on. CPUs can be 218 controlled through /sys/devices/system/cpu. 219 220 Say N if you want to disable CPU hotplug. 221 222config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 223 bool "Initialize Xtensa MMU inside the Linux kernel code" 224 depends on !XTENSA_VARIANT_FSF && !XTENSA_VARIANT_DC232B 225 default y if XTENSA_VARIANT_DC233C || XTENSA_VARIANT_CUSTOM 226 help 227 Earlier version initialized the MMU in the exception vector 228 before jumping to _startup in head.S and had an advantage that 229 it was possible to place a software breakpoint at 'reset' and 230 then enter your normal kernel breakpoints once the MMU was mapped 231 to the kernel mappings (0XC0000000). 232 233 This unfortunately won't work for U-Boot and likely also wont 234 work for using KEXEC to have a hot kernel ready for doing a 235 KDUMP. 236 237 So now the MMU is initialized in head.S but it's necessary to 238 use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup. 239 xt-gdb can't place a Software Breakpoint in the 0XD region prior 240 to mapping the MMU and after mapping even if the area of low memory 241 was mapped gdb wouldn't remove the breakpoint on hitting it as the 242 PC wouldn't match. Since Hardware Breakpoints are recommended for 243 Linux configurations it seems reasonable to just assume they exist 244 and leave this older mechanism for unfortunate souls that choose 245 not to follow Tensilica's recommendation. 246 247 Selecting this will cause U-Boot to set the KERNEL Load and Entry 248 address at 0x00003000 instead of the mapped std of 0xD0003000. 249 250 If in doubt, say Y. 251 252config MEMMAP_CACHEATTR 253 hex "Cache attributes for the memory address space" 254 depends on !MMU 255 default 0x22222222 256 help 257 These cache attributes are set up for noMMU systems. Each hex digit 258 specifies cache attributes for the corresponding 512MB memory 259 region: bits 0..3 -- for addresses 0x00000000..0x1fffffff, 260 bits 4..7 -- for addresses 0x20000000..0x3fffffff, and so on. 261 262 Cache attribute values are specific for the MMU type, so e.g. 263 for region protection MMUs: 2 is cache bypass, 4 is WB cached, 264 1 is WT cached, f is illegal. For ful MMU: bit 0 makes it executable, 265 bit 1 makes it writable, bits 2..3 meaning is 0: cache bypass, 266 1: WB cache, 2: WT cache, 3: special (c and e are illegal, f is 267 reserved). 268 269config KSEG_PADDR 270 hex "Physical address of the KSEG mapping" 271 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX && MMU 272 default 0x00000000 273 help 274 This is the physical address where KSEG is mapped. Please refer to 275 the chosen KSEG layout help for the required address alignment. 276 Unpacked kernel image (including vectors) must be located completely 277 within KSEG. 278 Physical memory below this address is not available to linux. 279 280 If unsure, leave the default value here. 281 282config KERNEL_LOAD_ADDRESS 283 hex "Kernel load address" 284 default 0x60003000 if !MMU 285 default 0x00003000 if MMU && INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 286 default 0xd0003000 if MMU && !INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 287 help 288 This is the address where the kernel is loaded. 289 It is virtual address for MMUv2 configurations and physical address 290 for all other configurations. 291 292 If unsure, leave the default value here. 293 294config VECTORS_OFFSET 295 hex "Kernel vectors offset" 296 default 0x00003000 297 help 298 This is the offset of the kernel image from the relocatable vectors 299 base. 300 301 If unsure, leave the default value here. 302 303choice 304 prompt "KSEG layout" 305 depends on MMU 306 default XTENSA_KSEG_MMU_V2 307 308config XTENSA_KSEG_MMU_V2 309 bool "MMUv2: 128MB cached + 128MB uncached" 310 help 311 MMUv2 compatible kernel memory map: TLB way 5 maps 128MB starting 312 at KSEG_PADDR to 0xd0000000 with cache and to 0xd8000000 313 without cache. 314 KSEG_PADDR must be aligned to 128MB. 315 316config XTENSA_KSEG_256M 317 bool "256MB cached + 256MB uncached" 318 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 319 help 320 TLB way 6 maps 256MB starting at KSEG_PADDR to 0xb0000000 321 with cache and to 0xc0000000 without cache. 322 KSEG_PADDR must be aligned to 256MB. 323 324config XTENSA_KSEG_512M 325 bool "512MB cached + 512MB uncached" 326 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 327 help 328 TLB way 6 maps 512MB starting at KSEG_PADDR to 0xa0000000 329 with cache and to 0xc0000000 without cache. 330 KSEG_PADDR must be aligned to 256MB. 331 332endchoice 333 334config HIGHMEM 335 bool "High Memory Support" 336 depends on MMU 337 help 338 Linux can use the full amount of RAM in the system by 339 default. However, the default MMUv2 setup only maps the 340 lowermost 128 MB of memory linearly to the areas starting 341 at 0xd0000000 (cached) and 0xd8000000 (uncached). 342 When there are more than 128 MB memory in the system not 343 all of it can be "permanently mapped" by the kernel. 344 The physical memory that's not permanently mapped is called 345 "high memory". 346 347 If you are compiling a kernel which will never run on a 348 machine with more than 128 MB total physical RAM, answer 349 N here. 350 351 If unsure, say Y. 352 353config FAST_SYSCALL_XTENSA 354 bool "Enable fast atomic syscalls" 355 default n 356 help 357 fast_syscall_xtensa is a syscall that can make atomic operations 358 on UP kernel when processor has no s32c1i support. 359 360 This syscall is deprecated. It may have issues when called with 361 invalid arguments. It is provided only for backwards compatibility. 362 Only enable it if your userspace software requires it. 363 364 If unsure, say N. 365 366config FAST_SYSCALL_SPILL_REGISTERS 367 bool "Enable spill registers syscall" 368 default n 369 help 370 fast_syscall_spill_registers is a syscall that spills all active 371 register windows of a calling userspace task onto its stack. 372 373 This syscall is deprecated. It may have issues when called with 374 invalid arguments. It is provided only for backwards compatibility. 375 Only enable it if your userspace software requires it. 376 377 If unsure, say N. 378 379endmenu 380 381config XTENSA_CALIBRATE_CCOUNT 382 def_bool n 383 help 384 On some platforms (XT2000, for example), the CPU clock rate can 385 vary. The frequency can be determined, however, by measuring 386 against a well known, fixed frequency, such as an UART oscillator. 387 388config SERIAL_CONSOLE 389 def_bool n 390 391menu "Bus options" 392 393config PCI 394 bool "PCI support" 395 default y 396 help 397 Find out whether you have a PCI motherboard. PCI is the name of a 398 bus system, i.e. the way the CPU talks to the other stuff inside 399 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 400 VESA. If you have PCI, say Y, otherwise N. 401 402source "drivers/pci/Kconfig" 403 404endmenu 405 406menu "Platform options" 407 408choice 409 prompt "Xtensa System Type" 410 default XTENSA_PLATFORM_ISS 411 412config XTENSA_PLATFORM_ISS 413 bool "ISS" 414 select XTENSA_CALIBRATE_CCOUNT 415 select SERIAL_CONSOLE 416 help 417 ISS is an acronym for Tensilica's Instruction Set Simulator. 418 419config XTENSA_PLATFORM_XT2000 420 bool "XT2000" 421 select HAVE_IDE 422 help 423 XT2000 is the name of Tensilica's feature-rich emulation platform. 424 This hardware is capable of running a full Linux distribution. 425 426config XTENSA_PLATFORM_XTFPGA 427 bool "XTFPGA" 428 select ETHOC if ETHERNET 429 select PLATFORM_WANT_DEFAULT_MEM if !MMU 430 select SERIAL_CONSOLE 431 select XTENSA_CALIBRATE_CCOUNT 432 help 433 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605). 434 This hardware is capable of running a full Linux distribution. 435 436endchoice 437 438 439config XTENSA_CPU_CLOCK 440 int "CPU clock rate [MHz]" 441 depends on !XTENSA_CALIBRATE_CCOUNT 442 default 16 443 444config GENERIC_CALIBRATE_DELAY 445 bool "Auto calibration of the BogoMIPS value" 446 help 447 The BogoMIPS value can easily be derived from the CPU frequency. 448 449config CMDLINE_BOOL 450 bool "Default bootloader kernel arguments" 451 452config CMDLINE 453 string "Initial kernel command string" 454 depends on CMDLINE_BOOL 455 default "console=ttyS0,38400 root=/dev/ram" 456 help 457 On some architectures (EBSA110 and CATS), there is currently no way 458 for the boot loader to pass arguments to the kernel. For these 459 architectures, you should supply some command-line options at build 460 time by entering them here. As a minimum, you should specify the 461 memory size and the root device (e.g., mem=64M root=/dev/nfs). 462 463config USE_OF 464 bool "Flattened Device Tree support" 465 select OF 466 select OF_EARLY_FLATTREE 467 select OF_RESERVED_MEM 468 help 469 Include support for flattened device tree machine descriptions. 470 471config BUILTIN_DTB 472 string "DTB to build into the kernel image" 473 depends on OF 474 475config BLK_DEV_SIMDISK 476 tristate "Host file-based simulated block device support" 477 default n 478 depends on XTENSA_PLATFORM_ISS && BLOCK 479 help 480 Create block devices that map to files in the host file system. 481 Device binding to host file may be changed at runtime via proc 482 interface provided the device is not in use. 483 484config BLK_DEV_SIMDISK_COUNT 485 int "Number of host file-based simulated block devices" 486 range 1 10 487 depends on BLK_DEV_SIMDISK 488 default 2 489 help 490 This is the default minimal number of created block devices. 491 Kernel/module parameter 'simdisk_count' may be used to change this 492 value at runtime. More file names (but no more than 10) may be 493 specified as parameters, simdisk_count grows accordingly. 494 495config SIMDISK0_FILENAME 496 string "Host filename for the first simulated device" 497 depends on BLK_DEV_SIMDISK = y 498 default "" 499 help 500 Attach a first simdisk to a host file. Conventionally, this file 501 contains a root file system. 502 503config SIMDISK1_FILENAME 504 string "Host filename for the second simulated device" 505 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1 506 default "" 507 help 508 Another simulated disk in a host file for a buildroot-independent 509 storage. 510 511source "mm/Kconfig" 512 513config FORCE_MAX_ZONEORDER 514 int "Maximum zone order" 515 default "11" 516 help 517 The kernel memory allocator divides physically contiguous memory 518 blocks into "zones", where each zone is a power of two number of 519 pages. This option selects the largest power of two that the kernel 520 keeps in the memory allocator. If you need to allocate very large 521 blocks of physically contiguous memory, then you may need to 522 increase this value. 523 524 This config option is actually maximum order plus one. For example, 525 a value of 11 means that the largest free memory block is 2^10 pages. 526 527source "drivers/pcmcia/Kconfig" 528 529config PLATFORM_WANT_DEFAULT_MEM 530 def_bool n 531 532config DEFAULT_MEM_START 533 hex 534 prompt "PAGE_OFFSET/PHYS_OFFSET" if !MMU && PLATFORM_WANT_DEFAULT_MEM 535 default 0x60000000 if PLATFORM_WANT_DEFAULT_MEM 536 default 0x00000000 537 help 538 This is the base address used for both PAGE_OFFSET and PHYS_OFFSET 539 in noMMU configurations. 540 541 If unsure, leave the default value here. 542 543config XTFPGA_LCD 544 bool "Enable XTFPGA LCD driver" 545 depends on XTENSA_PLATFORM_XTFPGA 546 default n 547 help 548 There's a 2x16 LCD on most of XTFPGA boards, kernel may output 549 progress messages there during bootup/shutdown. It may be useful 550 during board bringup. 551 552 If unsure, say N. 553 554config XTFPGA_LCD_BASE_ADDR 555 hex "XTFPGA LCD base address" 556 depends on XTFPGA_LCD 557 default "0x0d0c0000" 558 help 559 Base address of the LCD controller inside KIO region. 560 Different boards from XTFPGA family have LCD controller at different 561 addresses. Please consult prototyping user guide for your board for 562 the correct address. Wrong address here may lead to hardware lockup. 563 564config XTFPGA_LCD_8BIT_ACCESS 565 bool "Use 8-bit access to XTFPGA LCD" 566 depends on XTFPGA_LCD 567 default n 568 help 569 LCD may be connected with 4- or 8-bit interface, 8-bit access may 570 only be used with 8-bit interface. Please consult prototyping user 571 guide for your board for the correct interface width. 572 573endmenu 574 575menu "Executable file formats" 576 577source "fs/Kconfig.binfmt" 578 579endmenu 580 581menu "Power management options" 582 583source "kernel/power/Kconfig" 584 585endmenu 586 587source "net/Kconfig" 588 589source "drivers/Kconfig" 590 591source "fs/Kconfig" 592 593source "arch/xtensa/Kconfig.debug" 594 595source "security/Kconfig" 596 597source "crypto/Kconfig" 598 599source "lib/Kconfig" 600 601 602