1 # SPDX-License-Identifier: GPL-2.0
4 select ARCH_32BIT_OFF_T
5 select ARCH_HAS_BINFMT_FLAT if !MMU
6 select ARCH_HAS_DMA_PREP_COHERENT if MMU
7 select ARCH_HAS_SYNC_DMA_FOR_CPU if MMU
8 select ARCH_HAS_SYNC_DMA_FOR_DEVICE if MMU
9 select ARCH_HAS_DMA_SET_UNCACHED if MMU
10 select ARCH_HAS_STRNCPY_FROM_USER if !KASAN
11 select ARCH_HAS_STRNLEN_USER
12 select ARCH_USE_MEMTEST
13 select ARCH_USE_QUEUED_RWLOCKS
14 select ARCH_USE_QUEUED_SPINLOCKS
15 select ARCH_WANT_FRAME_POINTERS
16 select ARCH_WANT_IPC_PARSE_VERSION
17 select BUILDTIME_TABLE_SORT
18 select CLONE_BACKWARDS
20 select DMA_REMAP if MMU
21 select GENERIC_ATOMIC64
22 select GENERIC_IRQ_SHOW
23 select GENERIC_PCI_IOMAP
24 select GENERIC_SCHED_CLOCK
25 select HAVE_ARCH_AUDITSYSCALL
26 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
27 select HAVE_ARCH_KASAN if MMU && !XIP_KERNEL
28 select HAVE_ARCH_SECCOMP_FILTER
29 select HAVE_ARCH_TRACEHOOK
30 select HAVE_DEBUG_KMEMLEAK
31 select HAVE_DMA_CONTIGUOUS
32 select HAVE_EXIT_THREAD
33 select HAVE_FUNCTION_TRACER
34 select HAVE_FUTEX_CMPXCHG if !MMU && FUTEX
35 select HAVE_HW_BREAKPOINT if PERF_EVENTS
36 select HAVE_IRQ_TIME_ACCOUNTING
38 select HAVE_PERF_EVENTS
39 select HAVE_STACKPROTECTOR
40 select HAVE_SYSCALL_TRACEPOINTS
42 select MODULES_USE_ELF_RELA
43 select PERF_USE_VMALLOC
45 select TRACE_IRQFLAGS_SUPPORT
48 Xtensa processors are 32-bit RISC machines designed by Tensilica
49 primarily for embedded systems. These processors are both
50 configurable and extensible. The Linux port to the Xtensa
51 architecture supports all processor configurations and extensions,
52 with reasonable minimum requirements. The Xtensa Linux project has
53 a home page at <http://www.linux-xtensa.org/>.
55 config GENERIC_HWEIGHT
58 config ARCH_HAS_ILOG2_U32
61 config ARCH_HAS_ILOG2_U64
71 config LOCKDEP_SUPPORT
74 config STACKTRACE_SUPPORT
80 config HAVE_XTENSA_GPIO32
83 config KASAN_SHADOW_OFFSET
88 def_bool $(success,test "$(shell,echo __XTENSA_EB__ | $(CC) -E -P -)" = 1)
90 config CPU_LITTLE_ENDIAN
91 def_bool !CPU_BIG_ENDIAN
93 menu "Processor type and features"
96 prompt "Xtensa Processor Configuration"
97 default XTENSA_VARIANT_FSF
99 config XTENSA_VARIANT_FSF
100 bool "fsf - default (not generic) configuration"
103 config XTENSA_VARIANT_DC232B
104 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
106 select HAVE_XTENSA_GPIO32
108 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
110 config XTENSA_VARIANT_DC233C
111 bool "dc233c - Diamond 233L Standard Core Rev.C (LE)"
113 select HAVE_XTENSA_GPIO32
115 This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE).
117 config XTENSA_VARIANT_CUSTOM
118 bool "Custom Xtensa processor configuration"
119 select HAVE_XTENSA_GPIO32
121 Select this variant to use a custom Xtensa processor configuration.
122 You will be prompted for a processor variant CORENAME.
125 config XTENSA_VARIANT_CUSTOM_NAME
126 string "Xtensa Processor Custom Core Variant Name"
127 depends on XTENSA_VARIANT_CUSTOM
129 Provide the name of a custom Xtensa processor variant.
130 This CORENAME selects arch/xtensa/variant/CORENAME.
131 Don't forget you have to select MMU if you have one.
133 config XTENSA_VARIANT_NAME
135 default "dc232b" if XTENSA_VARIANT_DC232B
136 default "dc233c" if XTENSA_VARIANT_DC233C
137 default "fsf" if XTENSA_VARIANT_FSF
138 default XTENSA_VARIANT_CUSTOM_NAME if XTENSA_VARIANT_CUSTOM
140 config XTENSA_VARIANT_MMU
141 bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)"
142 depends on XTENSA_VARIANT_CUSTOM
146 Build a Conventional Kernel with full MMU support,
147 ie: it supports a TLB with auto-loading, page protection.
149 config XTENSA_VARIANT_HAVE_PERF_EVENTS
150 bool "Core variant has Performance Monitor Module"
151 depends on XTENSA_VARIANT_CUSTOM
154 Enable if core variant has Performance Monitor Module with
155 External Registers Interface.
159 config XTENSA_FAKE_NMI
160 bool "Treat PMM IRQ as NMI"
161 depends on XTENSA_VARIANT_HAVE_PERF_EVENTS
164 If PMM IRQ is the only IRQ at EXCM level it is safe to
165 treat it as NMI, which improves accuracy of profiling.
167 If there are other interrupts at or above PMM IRQ priority level
168 but not above the EXCM level, PMM IRQ still may be treated as NMI,
169 but only if these IRQs are not used. There will be a build warning
170 saying that this is not safe, and a bugcheck if one of these IRQs
175 config XTENSA_UNALIGNED_USER
176 bool "Unaligned memory access in user space"
178 The Xtensa architecture currently does not handle unaligned
179 memory accesses in hardware but through an exception handler.
180 Per default, unaligned memory accesses are disabled in user space.
182 Say Y here to enable unaligned memory access in user space.
185 bool "System Supports SMP (MX)"
186 depends on XTENSA_VARIANT_CUSTOM
189 This option is used to indicate that the system-on-a-chip (SOC)
190 supports Multiprocessing. Multiprocessor support implemented above
191 the CPU core definition and currently needs to be selected manually.
193 Multiprocessor support is implemented with external cache and
194 interrupt controllers.
196 The MX interrupt distributer adds Interprocessor Interrupts
197 and causes the IRQ numbers to be increased by 4 for devices
198 like the open cores ethernet driver and the serial interface.
200 You still have to select "Enable SMP" to enable SMP on this SOC.
203 bool "Enable Symmetric multi-processing support"
205 select GENERIC_SMP_IDLE_THREAD
207 Enabled SMP Software; allows more than one CPU/CORE
208 to be activated during startup.
212 int "Maximum number of CPUs (2-32)"
217 bool "Enable CPU hotplug support"
220 Say Y here to allow turning CPUs off and on. CPUs can be
221 controlled through /sys/devices/system/cpu.
223 Say N if you want to disable CPU hotplug.
225 config FAST_SYSCALL_XTENSA
226 bool "Enable fast atomic syscalls"
229 fast_syscall_xtensa is a syscall that can make atomic operations
230 on UP kernel when processor has no s32c1i support.
232 This syscall is deprecated. It may have issues when called with
233 invalid arguments. It is provided only for backwards compatibility.
234 Only enable it if your userspace software requires it.
238 config FAST_SYSCALL_SPILL_REGISTERS
239 bool "Enable spill registers syscall"
242 fast_syscall_spill_registers is a syscall that spills all active
243 register windows of a calling userspace task onto its stack.
245 This syscall is deprecated. It may have issues when called with
246 invalid arguments. It is provided only for backwards compatibility.
247 Only enable it if your userspace software requires it.
251 config USER_ABI_CALL0
255 prompt "Userspace ABI"
256 default USER_ABI_DEFAULT
258 Select supported userspace ABI.
260 If unsure, choose the default ABI.
262 config USER_ABI_DEFAULT
263 bool "Default ABI only"
265 Assume default userspace ABI. For XEA2 cores it is windowed ABI.
266 call0 ABI binaries may be run on such kernel, but signal delivery
267 will not work correctly for them.
269 config USER_ABI_CALL0_ONLY
270 bool "Call0 ABI only"
271 select USER_ABI_CALL0
273 Select this option to support only call0 ABI in userspace.
274 Windowed ABI binaries will crash with a segfault caused by
275 an illegal instruction exception on the first 'entry' opcode.
277 Choose this option if you're planning to run only user code
278 built with call0 ABI.
280 config USER_ABI_CALL0_PROBE
281 bool "Support both windowed and call0 ABI by probing"
282 select USER_ABI_CALL0
284 Select this option to support both windowed and call0 userspace
285 ABIs. When enabled all processes are started with PS.WOE disabled
286 and a fast user exception handler for an illegal instruction is
287 used to turn on PS.WOE bit on the first 'entry' opcode executed by
290 This option should be enabled for the kernel that must support
291 both call0 and windowed ABIs in userspace at the same time.
293 Note that Xtensa ISA does not guarantee that entry opcode will
294 raise an illegal instruction exception on cores with XEA2 when
295 PS.WOE is disabled, check whether the target core supports it.
301 config XTENSA_CALIBRATE_CCOUNT
304 On some platforms (XT2000, for example), the CPU clock rate can
305 vary. The frequency can be determined, however, by measuring
306 against a well known, fixed frequency, such as an UART oscillator.
308 config SERIAL_CONSOLE
311 config PLATFORM_HAVE_XIP
314 menu "Platform options"
317 prompt "Xtensa System Type"
318 default XTENSA_PLATFORM_ISS
320 config XTENSA_PLATFORM_ISS
322 select XTENSA_CALIBRATE_CCOUNT
323 select SERIAL_CONSOLE
325 ISS is an acronym for Tensilica's Instruction Set Simulator.
327 config XTENSA_PLATFORM_XT2000
330 XT2000 is the name of Tensilica's feature-rich emulation platform.
331 This hardware is capable of running a full Linux distribution.
333 config XTENSA_PLATFORM_XTFPGA
335 select ETHOC if ETHERNET
336 select PLATFORM_WANT_DEFAULT_MEM if !MMU
337 select SERIAL_CONSOLE
338 select XTENSA_CALIBRATE_CCOUNT
339 select PLATFORM_HAVE_XIP
341 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
342 This hardware is capable of running a full Linux distribution.
346 config PLATFORM_NR_IRQS
348 default 3 if XTENSA_PLATFORM_XT2000
351 config XTENSA_CPU_CLOCK
352 int "CPU clock rate [MHz]"
353 depends on !XTENSA_CALIBRATE_CCOUNT
356 config GENERIC_CALIBRATE_DELAY
357 bool "Auto calibration of the BogoMIPS value"
359 The BogoMIPS value can easily be derived from the CPU frequency.
362 bool "Default bootloader kernel arguments"
365 string "Initial kernel command string"
366 depends on CMDLINE_BOOL
367 default "console=ttyS0,38400 root=/dev/ram"
369 On some architectures (EBSA110 and CATS), there is currently no way
370 for the boot loader to pass arguments to the kernel. For these
371 architectures, you should supply some command-line options at build
372 time by entering them here. As a minimum, you should specify the
373 memory size and the root device (e.g., mem=64M root=/dev/nfs).
376 bool "Flattened Device Tree support"
378 select OF_EARLY_FLATTREE
380 Include support for flattened device tree machine descriptions.
382 config BUILTIN_DTB_SOURCE
383 string "DTB to build into the kernel image"
386 config PARSE_BOOTPARAM
387 bool "Parse bootparam block"
390 Parse parameters passed to the kernel from the bootloader. It may
391 be disabled if the kernel is known to run without the bootloader.
396 prompt "Semihosting interface"
397 default XTENSA_SIMCALL_ISS
398 depends on XTENSA_PLATFORM_ISS
400 Choose semihosting interface that will be used for serial port,
401 block device and networking.
403 config XTENSA_SIMCALL_ISS
406 Use simcall instruction. simcall is only available on simulators,
407 it does nothing on hardware.
409 config XTENSA_SIMCALL_GDBIO
412 Use break instruction. It is available on real hardware when GDB
413 is attached to it via JTAG.
417 config BLK_DEV_SIMDISK
418 tristate "Host file-based simulated block device support"
420 depends on XTENSA_PLATFORM_ISS && BLOCK
422 Create block devices that map to files in the host file system.
423 Device binding to host file may be changed at runtime via proc
424 interface provided the device is not in use.
426 config BLK_DEV_SIMDISK_COUNT
427 int "Number of host file-based simulated block devices"
429 depends on BLK_DEV_SIMDISK
432 This is the default minimal number of created block devices.
433 Kernel/module parameter 'simdisk_count' may be used to change this
434 value at runtime. More file names (but no more than 10) may be
435 specified as parameters, simdisk_count grows accordingly.
437 config SIMDISK0_FILENAME
438 string "Host filename for the first simulated device"
439 depends on BLK_DEV_SIMDISK = y
442 Attach a first simdisk to a host file. Conventionally, this file
443 contains a root file system.
445 config SIMDISK1_FILENAME
446 string "Host filename for the second simulated device"
447 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
450 Another simulated disk in a host file for a buildroot-independent
454 bool "Enable XTFPGA LCD driver"
455 depends on XTENSA_PLATFORM_XTFPGA
458 There's a 2x16 LCD on most of XTFPGA boards, kernel may output
459 progress messages there during bootup/shutdown. It may be useful
460 during board bringup.
464 config XTFPGA_LCD_BASE_ADDR
465 hex "XTFPGA LCD base address"
466 depends on XTFPGA_LCD
469 Base address of the LCD controller inside KIO region.
470 Different boards from XTFPGA family have LCD controller at different
471 addresses. Please consult prototyping user guide for your board for
472 the correct address. Wrong address here may lead to hardware lockup.
474 config XTFPGA_LCD_8BIT_ACCESS
475 bool "Use 8-bit access to XTFPGA LCD"
476 depends on XTFPGA_LCD
479 LCD may be connected with 4- or 8-bit interface, 8-bit access may
480 only be used with 8-bit interface. Please consult prototyping user
481 guide for your board for the correct interface width.
483 comment "Kernel memory layout"
485 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
486 bool "Initialize Xtensa MMU inside the Linux kernel code"
487 depends on !XTENSA_VARIANT_FSF && !XTENSA_VARIANT_DC232B
488 default y if XTENSA_VARIANT_DC233C || XTENSA_VARIANT_CUSTOM
490 Earlier version initialized the MMU in the exception vector
491 before jumping to _startup in head.S and had an advantage that
492 it was possible to place a software breakpoint at 'reset' and
493 then enter your normal kernel breakpoints once the MMU was mapped
494 to the kernel mappings (0XC0000000).
496 This unfortunately won't work for U-Boot and likely also won't
497 work for using KEXEC to have a hot kernel ready for doing a
500 So now the MMU is initialized in head.S but it's necessary to
501 use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
502 xt-gdb can't place a Software Breakpoint in the 0XD region prior
503 to mapping the MMU and after mapping even if the area of low memory
504 was mapped gdb wouldn't remove the breakpoint on hitting it as the
505 PC wouldn't match. Since Hardware Breakpoints are recommended for
506 Linux configurations it seems reasonable to just assume they exist
507 and leave this older mechanism for unfortunate souls that choose
508 not to follow Tensilica's recommendation.
510 Selecting this will cause U-Boot to set the KERNEL Load and Entry
511 address at 0x00003000 instead of the mapped std of 0xD0003000.
516 bool "Kernel Execute-In-Place from ROM"
517 depends on PLATFORM_HAVE_XIP
519 Execute-In-Place allows the kernel to run from non-volatile storage
520 directly addressable by the CPU, such as NOR flash. This saves RAM
521 space since the text section of the kernel is not loaded from flash
522 to RAM. Read-write sections, such as the data section and stack,
523 are still copied to RAM. The XIP kernel is not compressed since
524 it has to run directly from flash, so it will take more space to
525 store it. The flash address used to link the kernel object files,
526 and for storing it, is configuration dependent. Therefore, if you
527 say Y here, you must know the proper physical address where to
528 store the kernel image depending on your own flash memory usage.
530 Also note that the make target becomes "make xipImage" rather than
531 "make Image" or "make uImage". The final kernel binary to put in
532 ROM memory will be arch/xtensa/boot/xipImage.
536 config MEMMAP_CACHEATTR
537 hex "Cache attributes for the memory address space"
541 These cache attributes are set up for noMMU systems. Each hex digit
542 specifies cache attributes for the corresponding 512MB memory
543 region: bits 0..3 -- for addresses 0x00000000..0x1fffffff,
544 bits 4..7 -- for addresses 0x20000000..0x3fffffff, and so on.
546 Cache attribute values are specific for the MMU type.
547 For region protection MMUs:
559 3: special (c and e are illegal, f is reserved).
563 2: WB, no-write-allocate cache,
568 hex "Physical address of the KSEG mapping"
569 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX && MMU
572 This is the physical address where KSEG is mapped. Please refer to
573 the chosen KSEG layout help for the required address alignment.
574 Unpacked kernel image (including vectors) must be located completely
576 Physical memory below this address is not available to linux.
578 If unsure, leave the default value here.
580 config KERNEL_VIRTUAL_ADDRESS
581 hex "Kernel virtual address"
582 depends on MMU && XIP_KERNEL
585 This is the virtual address where the XIP kernel is mapped.
586 XIP kernel may be mapped into KSEG or KIO region, virtual address
587 provided here must match kernel load address provided in
590 config KERNEL_LOAD_ADDRESS
591 hex "Kernel load address"
592 default 0x60003000 if !MMU
593 default 0x00003000 if MMU && INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
594 default 0xd0003000 if MMU && !INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
596 This is the address where the kernel is loaded.
597 It is virtual address for MMUv2 configurations and physical address
598 for all other configurations.
600 If unsure, leave the default value here.
603 prompt "Relocatable vectors location"
604 default XTENSA_VECTORS_IN_TEXT
606 Choose whether relocatable vectors are merged into the kernel .text
607 or placed separately at runtime. This option does not affect
608 configurations without VECBASE register where vectors are always
609 placed at their hardware-defined locations.
611 config XTENSA_VECTORS_IN_TEXT
612 bool "Merge relocatable vectors into kernel text"
615 This option puts relocatable vectors into the kernel .text section
616 with proper alignment.
617 This is a safe choice for most configurations.
619 config XTENSA_VECTORS_SEPARATE
620 bool "Put relocatable vectors at fixed address"
622 This option puts relocatable vectors at specific virtual address.
623 Vectors are merged with the .init data in the kernel image and
624 are copied into their designated location during kernel startup.
625 Use it to put vectors into IRAM or out of FLASH on kernels with
626 XIP-aware MTD support.
631 hex "Kernel vectors virtual address"
633 depends on XTENSA_VECTORS_SEPARATE
635 This is the virtual address of the (relocatable) vectors base.
636 It must be within KSEG if MMU is used.
639 hex "XIP kernel data virtual address"
640 depends on XIP_KERNEL
643 This is the virtual address where XIP kernel data is copied.
644 It must be within KSEG if MMU is used.
646 config PLATFORM_WANT_DEFAULT_MEM
649 config DEFAULT_MEM_START
651 prompt "PAGE_OFFSET/PHYS_OFFSET" if !MMU && PLATFORM_WANT_DEFAULT_MEM
652 default 0x60000000 if PLATFORM_WANT_DEFAULT_MEM
655 This is the base address used for both PAGE_OFFSET and PHYS_OFFSET
656 in noMMU configurations.
658 If unsure, leave the default value here.
663 default XTENSA_KSEG_MMU_V2
665 config XTENSA_KSEG_MMU_V2
666 bool "MMUv2: 128MB cached + 128MB uncached"
668 MMUv2 compatible kernel memory map: TLB way 5 maps 128MB starting
669 at KSEG_PADDR to 0xd0000000 with cache and to 0xd8000000
671 KSEG_PADDR must be aligned to 128MB.
673 config XTENSA_KSEG_256M
674 bool "256MB cached + 256MB uncached"
675 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
677 TLB way 6 maps 256MB starting at KSEG_PADDR to 0xb0000000
678 with cache and to 0xc0000000 without cache.
679 KSEG_PADDR must be aligned to 256MB.
681 config XTENSA_KSEG_512M
682 bool "512MB cached + 512MB uncached"
683 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
685 TLB way 6 maps 512MB starting at KSEG_PADDR to 0xa0000000
686 with cache and to 0xc0000000 without cache.
687 KSEG_PADDR must be aligned to 256MB.
692 bool "High Memory Support"
696 Linux can use the full amount of RAM in the system by
697 default. However, the default MMUv2 setup only maps the
698 lowermost 128 MB of memory linearly to the areas starting
699 at 0xd0000000 (cached) and 0xd8000000 (uncached).
700 When there are more than 128 MB memory in the system not
701 all of it can be "permanently mapped" by the kernel.
702 The physical memory that's not permanently mapped is called
705 If you are compiling a kernel which will never run on a
706 machine with more than 128 MB total physical RAM, answer
711 config FORCE_MAX_ZONEORDER
712 int "Maximum zone order"
715 The kernel memory allocator divides physically contiguous memory
716 blocks into "zones", where each zone is a power of two number of
717 pages. This option selects the largest power of two that the kernel
718 keeps in the memory allocator. If you need to allocate very large
719 blocks of physically contiguous memory, then you may need to
722 This config option is actually maximum order plus one. For example,
723 a value of 11 means that the largest free memory block is 2^10 pages.
727 menu "Power management options"
729 source "kernel/power/Kconfig"