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_CPU_CACHE_ALIASING
10 select ARCH_HAS_CACHE_LINE_SIZE
11 select ARCH_HAS_DEBUG_VM_PGTABLE
12 select ARCH_HAS_DMA_PREP_COHERENT
13 select ARCH_HAS_PTE_SPECIAL
14 select ARCH_HAS_SETUP_DMA_OPS
15 select ARCH_HAS_SYNC_DMA_FOR_CPU
16 select ARCH_HAS_SYNC_DMA_FOR_DEVICE
17 select ARCH_NEED_CMPXCHG_1_EMU
18 select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC
19 select ARCH_32BIT_OFF_T
20 select BUILDTIME_TABLE_SORT
21 select GENERIC_BUILTIN_DTB
22 select CLONE_BACKWARDS
24 select DMA_DIRECT_REMAP
25 select GENERIC_ATOMIC64 if !ISA_ARCV2 || !(ARC_HAS_LL64 && ARC_HAS_LLSC)
26 # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
27 select GENERIC_IRQ_SHOW
28 select GENERIC_PCI_IOMAP
29 select GENERIC_SCHED_CLOCK
30 select GENERIC_SMP_IDLE_THREAD
31 select GENERIC_IOREMAP
32 select GENERIC_STRNCPY_FROM_USER if MMU
33 select GENERIC_STRNLEN_USER if MMU
35 select HAVE_ARCH_TRACEHOOK
36 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if ARC_MMU_V4
37 select HAVE_DEBUG_STACKOVERFLOW
38 select HAVE_DEBUG_KMEMLEAK
39 select HAVE_IOREMAP_PROT
40 select HAVE_KERNEL_GZIP
41 select HAVE_KERNEL_LZMA
43 select HAVE_KRETPROBES
44 select HAVE_REGS_AND_STACK_ACCESS_API
45 select HAVE_MOD_ARCH_SPECIFIC
46 select HAVE_PERF_EVENTS
47 select HAVE_SYSCALL_TRACEPOINTS
49 select LOCK_MM_AND_FIND_VMA
50 select MODULES_USE_ELF_RELA
52 select OF_EARLY_FLATTREE
53 select PCI_SYSCALL if PCI
54 select HAVE_ARCH_JUMP_LABEL if ISA_ARCV2 && !CPU_ENDIAN_BE32
55 select TRACE_IRQFLAGS_SUPPORT
56 select HAVE_EBPF_JIT if ISA_ARCV2
58 config LOCKDEP_SUPPORT
61 config SCHED_OMIT_FRAME_POINTER
67 config ARCH_FLATMEM_ENABLE
76 config GENERIC_CALIBRATE_DELAY
79 config GENERIC_HWEIGHT
82 config STACKTRACE_SUPPORT
86 menu "ARC Architecture Configuration"
88 menu "ARC Platform/SoC/Board"
90 source "arch/arc/plat-tb10x/Kconfig"
91 source "arch/arc/plat-axs10x/Kconfig"
92 source "arch/arc/plat-hsdk/Kconfig"
97 prompt "ARC Instruction Set"
102 select CPU_NO_EFFICIENT_FFS
104 The original ARC ISA of ARC600/700 cores
108 select ARC_TIMERS_64BIT
110 ISA for the Next Generation ARC-HS cores
114 menu "ARC CPU Configuration"
118 default ARC_CPU_770 if ISA_ARCOMPACT
119 default ARC_CPU_HS if ISA_ARCV2
123 depends on ISA_ARCOMPACT
126 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
127 This core has a bunch of cool new features:
128 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
129 Shared Address Spaces (for sharing TLB entries in MMU)
130 -Caches: New Prog Model, Region Flush
131 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
137 Support for ARC HS38x Cores based on ARCv2 ISA
138 The notable features are:
139 - SMP configurations of up to 4 cores with coherency
140 - Optional L2 Cache and IO-Coherency
141 - Revised Interrupt Architecture (multiple priorites, reg banks,
142 auto stack switch, auto regfile save/restore)
143 - MMUv4 (PIPT dcache, Huge Pages)
145 * 64bit load/store: LDD, STD
146 * Hardware assisted divide/remainder: DIV, REM
147 * Function prologue/epilogue: ENTER_S, LEAVE_S
148 * IRQ enable/disable: CLRI, SETI
149 * pop count: FFS, FLS
150 * SETcc, BMSKN, XBFU...
155 string "Override default -mcpu compiler flag"
158 Override default -mcpu=xxx compiler flag (which is set depending on
159 the ISA version) with the specified value.
160 NOTE: If specified flag isn't supported by current compiler the
161 ISA default value will be used as a fallback.
163 config CPU_BIG_ENDIAN
164 bool "Enable Big Endian Mode"
166 Build kernel for Big Endian Mode of ARC CPU
169 bool "Symmetric Multi-Processing"
170 select ARC_MCIP if ISA_ARCV2
172 This enables support for systems with more than one CPU.
177 int "Maximum number of CPUs (2-4096)"
181 config ARC_SMP_HALT_ON_RESET
182 bool "Enable Halt-on-reset boot mode"
184 In SMP configuration cores can be configured as Halt-on-reset
185 or they could all start at same time. For Halt-on-reset, non
186 masters are parked until Master kicks them so they can start off
187 at designated entry point. For other case, all jump to common
188 entry point and spin wait for Master's signal.
193 bool "ARConnect Multicore IP (MCIP) Support "
197 This IP block enables SMP in ARC-HS38 cores.
198 It provides for cross-core interrupts, multi-core debug
199 hardware semaphores, shared memory,....
202 bool "Enable Cache Support"
207 config ARC_CACHE_LINE_SHIFT
208 int "Cache Line Length (as power of 2)"
212 Starting with ARC700 4.9, Cache line length is configurable,
213 This option specifies "N", with Line-len = 2 power N
214 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
215 Linux only supports same line lengths for I and D caches.
217 config ARC_HAS_ICACHE
218 bool "Use Instruction Cache"
221 config ARC_HAS_DCACHE
222 bool "Use Data Cache"
225 config ARC_CACHE_PAGES
226 bool "Per Page Cache Control"
228 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
230 This can be used to over-ride the global I/D Cache Enable on a
231 per-page basis (but only for pages accessed via MMU such as
232 Kernel Virtual address or User Virtual Address)
233 TLB entries have a per-page Cache Enable Bit.
234 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
235 Global DISABLE + Per Page ENABLE won't work
242 Single Cycle RAMS to store Fast Path Code
245 int "ICCM Size in KB"
247 depends on ARC_HAS_ICCM
252 Single Cycle RAMS to store Fast Path Data
255 int "DCCM Size in KB"
257 depends on ARC_HAS_DCCM
260 hex "DCCM map address"
262 depends on ARC_HAS_DCCM
266 default ARC_MMU_V3 if ISA_ARCOMPACT
267 default ARC_MMU_V4 if ISA_ARCV2
271 depends on ISA_ARCOMPACT
273 Introduced with ARC700 4.10: New Features
274 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
275 Shared Address Spaces (SASID)
285 prompt "MMU Page Size"
286 default ARC_PAGE_SIZE_8K
288 config ARC_PAGE_SIZE_8K
290 select HAVE_PAGE_SIZE_8KB
292 Choose between 8k vs 16k
294 config ARC_PAGE_SIZE_16K
295 select HAVE_PAGE_SIZE_16KB
298 config ARC_PAGE_SIZE_4K
300 select HAVE_PAGE_SIZE_4KB
305 prompt "MMU Super Page Size"
306 depends on ISA_ARCV2 && TRANSPARENT_HUGEPAGE
307 default ARC_HUGEPAGE_2M
309 config ARC_HUGEPAGE_2M
312 config ARC_HUGEPAGE_16M
317 config PGTABLE_LEVELS
318 int "Number of Page table levels"
321 config ARC_COMPACT_IRQ_LEVELS
322 depends on ISA_ARCOMPACT
323 bool "Setup Timer IRQ as high Priority"
324 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
327 config ARC_FPU_SAVE_RESTORE
328 bool "Enable FPU state persistence across context switch"
330 ARCompact FPU has internal registers to assist with Double precision
331 Floating Point operations. There are control and stauts registers
332 for floating point exceptions and rounding modes. These are
333 preserved across task context switch when enabled.
339 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
341 depends on !ARC_CANT_LLSC
344 bool "Insn: SWAPE (endian-swap)"
349 config ARC_USE_UNALIGNED_MEM_ACCESS
350 bool "Enable unaligned access in HW"
352 select HAVE_EFFICIENT_UNALIGNED_ACCESS
354 The ARC HS architecture supports unaligned memory access
355 which is disabled by default. Enable unaligned access in
356 hardware and use software to use it
359 bool "Insn: 64bit LDD/STD"
361 Enable gcc to generate 64-bit load/store instructions
362 ISA mandates even/odd registers to allow encoding of two
363 dest operands with 2 possible source operands.
366 config ARC_HAS_DIV_REM
367 bool "Insn: div, divu, rem, remu"
370 config ARC_HAS_ACCL_REGS
371 bool "Reg Pair ACCL:ACCH (FPU and/or MPY > 6 and/or DSP)"
374 Depending on the configuration, CPU can contain accumulator reg-pair
375 (also referred to as r58:r59). These can also be used by gcc as GPR so
376 kernel needs to save/restore per process
378 config ARC_DSP_HANDLED
381 config ARC_DSP_SAVE_RESTORE_REGS
388 Depending on the configuration, CPU can contain DSP registers
389 (ACC0_GLO, ACC0_GHI, DSP_BFLY0, DSP_CTRL, DSP_FFT_CTRL).
390 Below are options describing how to handle these registers in
391 interrupt entry / exit and in context switch.
394 bool "No DSP extension presence in HW"
396 No DSP extension presence in HW
398 config ARC_DSP_KERNEL
399 bool "DSP extension in HW, no support for userspace"
400 select ARC_HAS_ACCL_REGS
401 select ARC_DSP_HANDLED
403 DSP extension presence in HW, no support for DSP-enabled userspace
404 applications. We don't save / restore DSP registers and only do
405 some minimal preparations so userspace won't be able to break kernel
407 config ARC_DSP_USERSPACE
408 bool "Support DSP for userspace apps"
409 select ARC_HAS_ACCL_REGS
410 select ARC_DSP_HANDLED
411 select ARC_DSP_SAVE_RESTORE_REGS
413 DSP extension presence in HW, support save / restore DSP registers to
414 run DSP-enabled userspace applications
416 config ARC_DSP_AGU_USERSPACE
417 bool "Support DSP with AGU for userspace apps"
418 select ARC_HAS_ACCL_REGS
419 select ARC_DSP_HANDLED
420 select ARC_DSP_SAVE_RESTORE_REGS
422 DSP and AGU extensions presence in HW, support save / restore DSP
423 and AGU registers to run DSP-enabled userspace applications
426 config ARC_IRQ_NO_AUTOSAVE
427 bool "Disable hardware autosave regfile on interrupts"
430 On HS cores, taken interrupt auto saves the regfile on stack.
431 This is programmable and can be optionally disabled in which case
432 software INTERRUPT_PROLOGUE/EPILGUE do the needed work
434 config ARC_LPB_DISABLE
435 bool "Disable loop buffer (LPB)"
437 On HS cores, loop buffer (LPB) is programmable in runtime and can
438 be optionally disabled.
442 endmenu # "ARC CPU Configuration"
444 config LINUX_LINK_BASE
445 hex "Kernel link address"
448 ARC700 divides the 32 bit phy address space into two equal halves
449 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
450 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
451 Typically Linux kernel is linked at the start of untransalted addr,
452 hence the default value of 0x8zs.
453 However some customers have peripherals mapped at this addr, so
454 Linux needs to be scooted a bit.
455 If you don't know what the above means, leave this setting alone.
456 This needs to match memory start address specified in Device Tree
458 config LINUX_RAM_BASE
459 hex "RAM base address"
460 default LINUX_LINK_BASE
462 By default Linux is linked at base of RAM. However in some special
463 cases (such as HSDK), Linux can't be linked at start of DDR, hence
467 bool "High Memory Support"
468 select HAVE_ARCH_PFN_VALID
471 With ARC 2G:2G address split, only upper 2G is directly addressable by
472 kernel. Enable this to potentially allow access to rest of 2G and PAE
476 bool "Support for the 40-bit Physical Address Extension"
477 depends on ARC_MMU_V4
478 depends on !ARC_PAGE_SIZE_4K
480 select PHYS_ADDR_T_64BIT
482 Enable access to physical memory beyond 4G, only supported on
483 ARC cores with 40 bit Physical Addressing support
485 config ARC_KVADDR_SIZE
486 int "Kernel Virtual Address Space size (MB)"
490 The kernel address space is carved out of 256MB of translated address
491 space for catering to vmalloc, modules, pkmap, fixmap. This however may
492 not suffice vmalloc requirements of a 4K CPU EZChip system. So allow
493 this to be stretched to 512 MB (by extending into the reserved
496 config ARC_CURR_IN_REG
497 bool "cache current task pointer in gp"
500 This reserves gp register to point to Current Task in
501 kernel mode eliding memory access for each access
504 config ARC_EMUL_UNALIGNED
505 bool "Emulate unaligned memory access (userspace only)"
506 select SYSCTL_ARCH_UNALIGN_NO_WARN
507 select SYSCTL_ARCH_UNALIGN_ALLOW
508 depends on ISA_ARCOMPACT
510 This enables misaligned 16 & 32 bit memory access from user space.
511 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
512 potential bugs in code
515 int "Timer Frequency"
518 config ARC_METAWARE_HLINK
519 bool "Support for Metaware debugger assisted Host access"
521 This options allows a Linux userland apps to directly access
522 host file system (open/creat/read/write etc) with help from
523 Metaware Debugger. This can come in handy for Linux-host communication
524 when there is no real usable peripheral such as EMAC.
532 config ARC_DW2_UNWIND
533 bool "Enable DWARF specific kernel stack unwind"
537 Compiles the kernel with DWARF unwind information and can be used
538 to get stack backtraces.
540 If you say Y here the resulting kernel image will be slightly larger
541 but not slower, and it will give very useful debugging information.
542 If you don't debug the kernel, you can say N, but we may not be able
543 to solve problems without frame unwind information
545 config ARC_DBG_JUMP_LABEL
546 bool "Paranoid checks in Static Keys (jump labels) code"
547 depends on JUMP_LABEL
548 default y if STATIC_KEYS_SELFTEST
550 Enable paranoid checks and self-test of both ARC-specific and generic
551 part of static keys (jump labels) related code.
554 config BUILTIN_DTB_NAME
555 string "Built in DTB"
558 Set the name of the DTB to embed in the vmlinux binary.
560 endmenu # "ARC Architecture Configuration"
562 config ARCH_FORCE_MAX_ORDER
563 int "Maximum zone order"
564 default "11" if ARC_HUGEPAGE_16M
567 source "kernel/power/Kconfig"