1 # SPDX-License-Identifier: GPL-2.0-only
3 # Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
9 select ARCH_HAS_DEBUG_VM_PGTABLE
10 select ARCH_HAS_DMA_PREP_COHERENT
11 select ARCH_HAS_PTE_SPECIAL
12 select ARCH_HAS_SETUP_DMA_OPS
13 select ARCH_HAS_SYNC_DMA_FOR_CPU
14 select ARCH_HAS_SYNC_DMA_FOR_DEVICE
15 select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC
16 select ARCH_32BIT_OFF_T
17 select BUILDTIME_TABLE_SORT
18 select CLONE_BACKWARDS
20 select DMA_DIRECT_REMAP
21 select GENERIC_ATOMIC64 if !ISA_ARCV2 || !(ARC_HAS_LL64 && ARC_HAS_LLSC)
22 select GENERIC_FIND_FIRST_BIT
23 # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
24 select GENERIC_IRQ_SHOW
25 select GENERIC_PCI_IOMAP
26 select GENERIC_PENDING_IRQ if SMP
27 select GENERIC_SCHED_CLOCK
28 select GENERIC_SMP_IDLE_THREAD
30 select HAVE_ARCH_TRACEHOOK
31 select HAVE_DEBUG_STACKOVERFLOW
32 select HAVE_DEBUG_KMEMLEAK
33 select HAVE_FUTEX_CMPXCHG if FUTEX
34 select HAVE_IOREMAP_PROT
35 select HAVE_KERNEL_GZIP
36 select HAVE_KERNEL_LZMA
38 select HAVE_KRETPROBES
39 select HAVE_MOD_ARCH_SPECIFIC
41 select HAVE_PERF_EVENTS
42 select HANDLE_DOMAIN_IRQ
44 select MODULES_USE_ELF_RELA
46 select OF_EARLY_FLATTREE
47 select PCI_SYSCALL if PCI
48 select PERF_USE_VMALLOC if ARC_CACHE_VIPT_ALIASING
49 select HAVE_ARCH_JUMP_LABEL if ISA_ARCV2 && !CPU_ENDIAN_BE32
52 config ARCH_HAS_CACHE_LINE_SIZE
55 config TRACE_IRQFLAGS_SUPPORT
58 config LOCKDEP_SUPPORT
61 config SCHED_OMIT_FRAME_POINTER
67 config ARCH_DISCONTIGMEM_ENABLE
71 config ARCH_FLATMEM_ENABLE
80 config GENERIC_CALIBRATE_DELAY
83 config GENERIC_HWEIGHT
86 config STACKTRACE_SUPPORT
90 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
94 menu "ARC Architecture Configuration"
96 menu "ARC Platform/SoC/Board"
98 source "arch/arc/plat-tb10x/Kconfig"
99 source "arch/arc/plat-axs10x/Kconfig"
100 source "arch/arc/plat-hsdk/Kconfig"
105 prompt "ARC Instruction Set"
110 select CPU_NO_EFFICIENT_FFS
112 The original ARC ISA of ARC600/700 cores
116 select ARC_TIMERS_64BIT
118 ISA for the Next Generation ARC-HS cores
122 menu "ARC CPU Configuration"
126 default ARC_CPU_770 if ISA_ARCOMPACT
127 default ARC_CPU_HS if ISA_ARCV2
135 Support for ARC750 core
141 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
142 This core has a bunch of cool new features:
143 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
144 Shared Address Spaces (for sharing TLB entries in MMU)
145 -Caches: New Prog Model, Region Flush
146 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
154 Support for ARC HS38x Cores based on ARCv2 ISA
155 The notable features are:
156 - SMP configurations of up to 4 cores with coherency
157 - Optional L2 Cache and IO-Coherency
158 - Revised Interrupt Architecture (multiple priorites, reg banks,
159 auto stack switch, auto regfile save/restore)
160 - MMUv4 (PIPT dcache, Huge Pages)
162 * 64bit load/store: LDD, STD
163 * Hardware assisted divide/remainder: DIV, REM
164 * Function prologue/epilogue: ENTER_S, LEAVE_S
165 * IRQ enable/disable: CLRI, SETI
166 * pop count: FFS, FLS
167 * SETcc, BMSKN, XBFU...
172 string "Override default -mcpu compiler flag"
175 Override default -mcpu=xxx compiler flag (which is set depending on
176 the ISA version) with the specified value.
177 NOTE: If specified flag isn't supported by current compiler the
178 ISA default value will be used as a fallback.
180 config CPU_BIG_ENDIAN
181 bool "Enable Big Endian Mode"
183 Build kernel for Big Endian Mode of ARC CPU
186 bool "Symmetric Multi-Processing"
187 select ARC_MCIP if ISA_ARCV2
189 This enables support for systems with more than one CPU.
194 int "Maximum number of CPUs (2-4096)"
198 config ARC_SMP_HALT_ON_RESET
199 bool "Enable Halt-on-reset boot mode"
201 In SMP configuration cores can be configured as Halt-on-reset
202 or they could all start at same time. For Halt-on-reset, non
203 masters are parked until Master kicks them so they can start off
204 at designated entry point. For other case, all jump to common
205 entry point and spin wait for Master's signal.
210 bool "ARConnect Multicore IP (MCIP) Support "
214 This IP block enables SMP in ARC-HS38 cores.
215 It provides for cross-core interrupts, multi-core debug
216 hardware semaphores, shared memory,....
219 bool "Enable Cache Support"
224 config ARC_CACHE_LINE_SHIFT
225 int "Cache Line Length (as power of 2)"
229 Starting with ARC700 4.9, Cache line length is configurable,
230 This option specifies "N", with Line-len = 2 power N
231 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
232 Linux only supports same line lengths for I and D caches.
234 config ARC_HAS_ICACHE
235 bool "Use Instruction Cache"
238 config ARC_HAS_DCACHE
239 bool "Use Data Cache"
242 config ARC_CACHE_PAGES
243 bool "Per Page Cache Control"
245 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
247 This can be used to over-ride the global I/D Cache Enable on a
248 per-page basis (but only for pages accessed via MMU such as
249 Kernel Virtual address or User Virtual Address)
250 TLB entries have a per-page Cache Enable Bit.
251 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
252 Global DISABLE + Per Page ENABLE won't work
254 config ARC_CACHE_VIPT_ALIASING
255 bool "Support VIPT Aliasing D$"
256 depends on ARC_HAS_DCACHE && ISA_ARCOMPACT
263 Single Cycle RAMS to store Fast Path Code
266 int "ICCM Size in KB"
268 depends on ARC_HAS_ICCM
273 Single Cycle RAMS to store Fast Path Data
276 int "DCCM Size in KB"
278 depends on ARC_HAS_DCCM
281 hex "DCCM map address"
283 depends on ARC_HAS_DCCM
287 default ARC_MMU_V3 if ARC_CPU_770
288 default ARC_MMU_V2 if ARC_CPU_750D
289 default ARC_MMU_V4 if ARC_CPU_HS
301 Fixed the deficiency of v1 - possible thrashing in memcpy scenario
302 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
306 depends on ARC_CPU_770
308 Introduced with ARC700 4.10: New Features
309 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
310 Shared Address Spaces (SASID)
322 prompt "MMU Page Size"
323 default ARC_PAGE_SIZE_8K
325 config ARC_PAGE_SIZE_8K
328 Choose between 8k vs 16k
330 config ARC_PAGE_SIZE_16K
332 depends on ARC_MMU_V3 || ARC_MMU_V4
334 config ARC_PAGE_SIZE_4K
336 depends on ARC_MMU_V3 || ARC_MMU_V4
341 prompt "MMU Super Page Size"
342 depends on ISA_ARCV2 && TRANSPARENT_HUGEPAGE
343 default ARC_HUGEPAGE_2M
345 config ARC_HUGEPAGE_2M
348 config ARC_HUGEPAGE_16M
354 int "Maximum NUMA Nodes (as a power of 2)"
355 default "0" if !DISCONTIGMEM
356 default "1" if DISCONTIGMEM
357 depends on NEED_MULTIPLE_NODES
359 Accessing memory beyond 1GB (with or w/o PAE) requires 2 memory
362 config ARC_COMPACT_IRQ_LEVELS
363 depends on ISA_ARCOMPACT
364 bool "Setup Timer IRQ as high Priority"
365 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
368 config ARC_FPU_SAVE_RESTORE
369 bool "Enable FPU state persistence across context switch"
371 ARCompact FPU has internal registers to assist with Double precision
372 Floating Point operations. There are control and stauts registers
373 for floating point exceptions and rounding modes. These are
374 preserved across task context switch when enabled.
380 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
382 depends on !ARC_CANT_LLSC
385 bool "Insn: SWAPE (endian-swap)"
390 config ARC_USE_UNALIGNED_MEM_ACCESS
391 bool "Enable unaligned access in HW"
393 select HAVE_EFFICIENT_UNALIGNED_ACCESS
395 The ARC HS architecture supports unaligned memory access
396 which is disabled by default. Enable unaligned access in
397 hardware and use software to use it
400 bool "Insn: 64bit LDD/STD"
402 Enable gcc to generate 64-bit load/store instructions
403 ISA mandates even/odd registers to allow encoding of two
404 dest operands with 2 possible source operands.
407 config ARC_HAS_DIV_REM
408 bool "Insn: div, divu, rem, remu"
411 config ARC_HAS_ACCL_REGS
412 bool "Reg Pair ACCL:ACCH (FPU and/or MPY > 6 and/or DSP)"
415 Depending on the configuration, CPU can contain accumulator reg-pair
416 (also referred to as r58:r59). These can also be used by gcc as GPR so
417 kernel needs to save/restore per process
419 config ARC_DSP_HANDLED
422 config ARC_DSP_SAVE_RESTORE_REGS
429 Depending on the configuration, CPU can contain DSP registers
430 (ACC0_GLO, ACC0_GHI, DSP_BFLY0, DSP_CTRL, DSP_FFT_CTRL).
431 Bellow is options describing how to handle these registers in
432 interrupt entry / exit and in context switch.
435 bool "No DSP extension presence in HW"
437 No DSP extension presence in HW
439 config ARC_DSP_KERNEL
440 bool "DSP extension in HW, no support for userspace"
441 select ARC_HAS_ACCL_REGS
442 select ARC_DSP_HANDLED
444 DSP extension presence in HW, no support for DSP-enabled userspace
445 applications. We don't save / restore DSP registers and only do
446 some minimal preparations so userspace won't be able to break kernel
448 config ARC_DSP_USERSPACE
449 bool "Support DSP for userspace apps"
450 select ARC_HAS_ACCL_REGS
451 select ARC_DSP_HANDLED
452 select ARC_DSP_SAVE_RESTORE_REGS
454 DSP extension presence in HW, support save / restore DSP registers to
455 run DSP-enabled userspace applications
457 config ARC_DSP_AGU_USERSPACE
458 bool "Support DSP with AGU for userspace apps"
459 select ARC_HAS_ACCL_REGS
460 select ARC_DSP_HANDLED
461 select ARC_DSP_SAVE_RESTORE_REGS
463 DSP and AGU extensions presence in HW, support save / restore DSP
464 and AGU registers to run DSP-enabled userspace applications
467 config ARC_IRQ_NO_AUTOSAVE
468 bool "Disable hardware autosave regfile on interrupts"
471 On HS cores, taken interrupt auto saves the regfile on stack.
472 This is programmable and can be optionally disabled in which case
473 software INTERRUPT_PROLOGUE/EPILGUE do the needed work
475 config ARC_LPB_DISABLE
476 bool "Disable loop buffer (LPB)"
478 On HS cores, loop buffer (LPB) is programmable in runtime and can
479 be optionally disabled.
483 endmenu # "ARC CPU Configuration"
485 config LINUX_LINK_BASE
486 hex "Kernel link address"
489 ARC700 divides the 32 bit phy address space into two equal halves
490 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
491 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
492 Typically Linux kernel is linked at the start of untransalted addr,
493 hence the default value of 0x8zs.
494 However some customers have peripherals mapped at this addr, so
495 Linux needs to be scooted a bit.
496 If you don't know what the above means, leave this setting alone.
497 This needs to match memory start address specified in Device Tree
499 config LINUX_RAM_BASE
500 hex "RAM base address"
501 default LINUX_LINK_BASE
503 By default Linux is linked at base of RAM. However in some special
504 cases (such as HSDK), Linux can't be linked at start of DDR, hence
508 bool "High Memory Support"
509 select HAVE_ARCH_PFN_VALID
512 With ARC 2G:2G address split, only upper 2G is directly addressable by
513 kernel. Enable this to potentially allow access to rest of 2G and PAE
517 bool "Support for the 40-bit Physical Address Extension"
520 select PHYS_ADDR_T_64BIT
522 Enable access to physical memory beyond 4G, only supported on
523 ARC cores with 40 bit Physical Addressing support
525 config ARC_KVADDR_SIZE
526 int "Kernel Virtual Address Space size (MB)"
530 The kernel address space is carved out of 256MB of translated address
531 space for catering to vmalloc, modules, pkmap, fixmap. This however may
532 not suffice vmalloc requirements of a 4K CPU EZChip system. So allow
533 this to be stretched to 512 MB (by extending into the reserved
536 config ARC_CURR_IN_REG
537 bool "Dedicate Register r25 for current_task pointer"
540 This reserved Register R25 to point to Current Task in
541 kernel mode. This saves memory access for each such access
544 config ARC_EMUL_UNALIGNED
545 bool "Emulate unaligned memory access (userspace only)"
546 select SYSCTL_ARCH_UNALIGN_NO_WARN
547 select SYSCTL_ARCH_UNALIGN_ALLOW
548 depends on ISA_ARCOMPACT
550 This enables misaligned 16 & 32 bit memory access from user space.
551 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
552 potential bugs in code
555 int "Timer Frequency"
558 config ARC_METAWARE_HLINK
559 bool "Support for Metaware debugger assisted Host access"
561 This options allows a Linux userland apps to directly access
562 host file system (open/creat/read/write etc) with help from
563 Metaware Debugger. This can come in handy for Linux-host communication
564 when there is no real usable peripheral such as EMAC.
572 config ARC_DW2_UNWIND
573 bool "Enable DWARF specific kernel stack unwind"
577 Compiles the kernel with DWARF unwind information and can be used
578 to get stack backtraces.
580 If you say Y here the resulting kernel image will be slightly larger
581 but not slower, and it will give very useful debugging information.
582 If you don't debug the kernel, you can say N, but we may not be able
583 to solve problems without frame unwind information
585 config ARC_DBG_TLB_PARANOIA
586 bool "Paranoia Checks in Low Level TLB Handlers"
588 config ARC_DBG_JUMP_LABEL
589 bool "Paranoid checks in Static Keys (jump labels) code"
590 depends on JUMP_LABEL
591 default y if STATIC_KEYS_SELFTEST
593 Enable paranoid checks and self-test of both ARC-specific and generic
594 part of static keys (jump labels) related code.
597 config ARC_BUILTIN_DTB_NAME
598 string "Built in DTB"
600 Set the name of the DTB to embed in the vmlinux binary
601 Leaving it blank selects the minimal "skeleton" dtb
603 endmenu # "ARC Architecture Configuration"
605 config FORCE_MAX_ZONEORDER
606 int "Maximum zone order"
607 default "12" if ARC_HUGEPAGE_16M
610 source "kernel/power/Kconfig"