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_CACHE_LINE_SIZE
10 select ARCH_HAS_DEBUG_VM_PGTABLE
11 select ARCH_HAS_DMA_PREP_COHERENT
12 select ARCH_HAS_PTE_SPECIAL
13 select ARCH_HAS_SETUP_DMA_OPS
14 select ARCH_HAS_SYNC_DMA_FOR_CPU
15 select ARCH_HAS_SYNC_DMA_FOR_DEVICE
16 select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC
17 select ARCH_32BIT_OFF_T
18 select BUILDTIME_TABLE_SORT
19 select CLONE_BACKWARDS
21 select DMA_DIRECT_REMAP
22 select GENERIC_ATOMIC64 if !ISA_ARCV2 || !(ARC_HAS_LL64 && ARC_HAS_LLSC)
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_ARCH_TRANSPARENT_HUGEPAGE if ARC_MMU_V4
32 select HAVE_DEBUG_STACKOVERFLOW
33 select HAVE_DEBUG_KMEMLEAK
34 select HAVE_IOREMAP_PROT
35 select HAVE_KERNEL_GZIP
36 select HAVE_KERNEL_LZMA
38 select HAVE_KRETPROBES
39 select HAVE_REGS_AND_STACK_ACCESS_API
40 select HAVE_MOD_ARCH_SPECIFIC
41 select HAVE_PERF_EVENTS
42 select HAVE_SYSCALL_TRACEPOINTS
44 select LOCK_MM_AND_FIND_VMA
45 select MODULES_USE_ELF_RELA
47 select OF_EARLY_FLATTREE
48 select PCI_SYSCALL if PCI
49 select PERF_USE_VMALLOC if ARC_CACHE_VIPT_ALIASING
50 select HAVE_ARCH_JUMP_LABEL if ISA_ARCV2 && !CPU_ENDIAN_BE32
51 select TRACE_IRQFLAGS_SUPPORT
53 config LOCKDEP_SUPPORT
56 config SCHED_OMIT_FRAME_POINTER
62 config ARCH_FLATMEM_ENABLE
71 config GENERIC_CALIBRATE_DELAY
74 config GENERIC_HWEIGHT
77 config STACKTRACE_SUPPORT
81 menu "ARC Architecture Configuration"
83 menu "ARC Platform/SoC/Board"
85 source "arch/arc/plat-tb10x/Kconfig"
86 source "arch/arc/plat-axs10x/Kconfig"
87 source "arch/arc/plat-hsdk/Kconfig"
92 prompt "ARC Instruction Set"
97 select CPU_NO_EFFICIENT_FFS
99 The original ARC ISA of ARC600/700 cores
103 select ARC_TIMERS_64BIT
105 ISA for the Next Generation ARC-HS cores
109 menu "ARC CPU Configuration"
113 default ARC_CPU_770 if ISA_ARCOMPACT
114 default ARC_CPU_HS if ISA_ARCV2
118 depends on ISA_ARCOMPACT
121 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
122 This core has a bunch of cool new features:
123 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
124 Shared Address Spaces (for sharing TLB entries in MMU)
125 -Caches: New Prog Model, Region Flush
126 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
132 Support for ARC HS38x Cores based on ARCv2 ISA
133 The notable features are:
134 - SMP configurations of up to 4 cores with coherency
135 - Optional L2 Cache and IO-Coherency
136 - Revised Interrupt Architecture (multiple priorites, reg banks,
137 auto stack switch, auto regfile save/restore)
138 - MMUv4 (PIPT dcache, Huge Pages)
140 * 64bit load/store: LDD, STD
141 * Hardware assisted divide/remainder: DIV, REM
142 * Function prologue/epilogue: ENTER_S, LEAVE_S
143 * IRQ enable/disable: CLRI, SETI
144 * pop count: FFS, FLS
145 * SETcc, BMSKN, XBFU...
150 string "Override default -mcpu compiler flag"
153 Override default -mcpu=xxx compiler flag (which is set depending on
154 the ISA version) with the specified value.
155 NOTE: If specified flag isn't supported by current compiler the
156 ISA default value will be used as a fallback.
158 config CPU_BIG_ENDIAN
159 bool "Enable Big Endian Mode"
161 Build kernel for Big Endian Mode of ARC CPU
164 bool "Symmetric Multi-Processing"
165 select ARC_MCIP if ISA_ARCV2
167 This enables support for systems with more than one CPU.
172 int "Maximum number of CPUs (2-4096)"
176 config ARC_SMP_HALT_ON_RESET
177 bool "Enable Halt-on-reset boot mode"
179 In SMP configuration cores can be configured as Halt-on-reset
180 or they could all start at same time. For Halt-on-reset, non
181 masters are parked until Master kicks them so they can start off
182 at designated entry point. For other case, all jump to common
183 entry point and spin wait for Master's signal.
188 bool "ARConnect Multicore IP (MCIP) Support "
192 This IP block enables SMP in ARC-HS38 cores.
193 It provides for cross-core interrupts, multi-core debug
194 hardware semaphores, shared memory,....
197 bool "Enable Cache Support"
202 config ARC_CACHE_LINE_SHIFT
203 int "Cache Line Length (as power of 2)"
207 Starting with ARC700 4.9, Cache line length is configurable,
208 This option specifies "N", with Line-len = 2 power N
209 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
210 Linux only supports same line lengths for I and D caches.
212 config ARC_HAS_ICACHE
213 bool "Use Instruction Cache"
216 config ARC_HAS_DCACHE
217 bool "Use Data Cache"
220 config ARC_CACHE_PAGES
221 bool "Per Page Cache Control"
223 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
225 This can be used to over-ride the global I/D Cache Enable on a
226 per-page basis (but only for pages accessed via MMU such as
227 Kernel Virtual address or User Virtual Address)
228 TLB entries have a per-page Cache Enable Bit.
229 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
230 Global DISABLE + Per Page ENABLE won't work
232 config ARC_CACHE_VIPT_ALIASING
233 bool "Support VIPT Aliasing D$"
234 depends on ARC_HAS_DCACHE && ISA_ARCOMPACT
241 Single Cycle RAMS to store Fast Path Code
244 int "ICCM Size in KB"
246 depends on ARC_HAS_ICCM
251 Single Cycle RAMS to store Fast Path Data
254 int "DCCM Size in KB"
256 depends on ARC_HAS_DCCM
259 hex "DCCM map address"
261 depends on ARC_HAS_DCCM
265 default ARC_MMU_V3 if ISA_ARCOMPACT
266 default ARC_MMU_V4 if ISA_ARCV2
270 depends on ISA_ARCOMPACT
272 Introduced with ARC700 4.10: New Features
273 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
274 Shared Address Spaces (SASID)
284 prompt "MMU Page Size"
285 default ARC_PAGE_SIZE_8K
287 config ARC_PAGE_SIZE_8K
290 Choose between 8k vs 16k
292 config ARC_PAGE_SIZE_16K
295 config ARC_PAGE_SIZE_4K
297 depends on ARC_MMU_V3 || ARC_MMU_V4
302 prompt "MMU Super Page Size"
303 depends on ISA_ARCV2 && TRANSPARENT_HUGEPAGE
304 default ARC_HUGEPAGE_2M
306 config ARC_HUGEPAGE_2M
309 config ARC_HUGEPAGE_16M
314 config PGTABLE_LEVELS
315 int "Number of Page table levels"
318 config ARC_COMPACT_IRQ_LEVELS
319 depends on ISA_ARCOMPACT
320 bool "Setup Timer IRQ as high Priority"
321 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
324 config ARC_FPU_SAVE_RESTORE
325 bool "Enable FPU state persistence across context switch"
327 ARCompact FPU has internal registers to assist with Double precision
328 Floating Point operations. There are control and stauts registers
329 for floating point exceptions and rounding modes. These are
330 preserved across task context switch when enabled.
336 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
338 depends on !ARC_CANT_LLSC
341 bool "Insn: SWAPE (endian-swap)"
346 config ARC_USE_UNALIGNED_MEM_ACCESS
347 bool "Enable unaligned access in HW"
349 select HAVE_EFFICIENT_UNALIGNED_ACCESS
351 The ARC HS architecture supports unaligned memory access
352 which is disabled by default. Enable unaligned access in
353 hardware and use software to use it
356 bool "Insn: 64bit LDD/STD"
358 Enable gcc to generate 64-bit load/store instructions
359 ISA mandates even/odd registers to allow encoding of two
360 dest operands with 2 possible source operands.
363 config ARC_HAS_DIV_REM
364 bool "Insn: div, divu, rem, remu"
367 config ARC_HAS_ACCL_REGS
368 bool "Reg Pair ACCL:ACCH (FPU and/or MPY > 6 and/or DSP)"
371 Depending on the configuration, CPU can contain accumulator reg-pair
372 (also referred to as r58:r59). These can also be used by gcc as GPR so
373 kernel needs to save/restore per process
375 config ARC_DSP_HANDLED
378 config ARC_DSP_SAVE_RESTORE_REGS
385 Depending on the configuration, CPU can contain DSP registers
386 (ACC0_GLO, ACC0_GHI, DSP_BFLY0, DSP_CTRL, DSP_FFT_CTRL).
387 Below are options describing how to handle these registers in
388 interrupt entry / exit and in context switch.
391 bool "No DSP extension presence in HW"
393 No DSP extension presence in HW
395 config ARC_DSP_KERNEL
396 bool "DSP extension in HW, no support for userspace"
397 select ARC_HAS_ACCL_REGS
398 select ARC_DSP_HANDLED
400 DSP extension presence in HW, no support for DSP-enabled userspace
401 applications. We don't save / restore DSP registers and only do
402 some minimal preparations so userspace won't be able to break kernel
404 config ARC_DSP_USERSPACE
405 bool "Support DSP for userspace apps"
406 select ARC_HAS_ACCL_REGS
407 select ARC_DSP_HANDLED
408 select ARC_DSP_SAVE_RESTORE_REGS
410 DSP extension presence in HW, support save / restore DSP registers to
411 run DSP-enabled userspace applications
413 config ARC_DSP_AGU_USERSPACE
414 bool "Support DSP with AGU for userspace apps"
415 select ARC_HAS_ACCL_REGS
416 select ARC_DSP_HANDLED
417 select ARC_DSP_SAVE_RESTORE_REGS
419 DSP and AGU extensions presence in HW, support save / restore DSP
420 and AGU registers to run DSP-enabled userspace applications
423 config ARC_IRQ_NO_AUTOSAVE
424 bool "Disable hardware autosave regfile on interrupts"
427 On HS cores, taken interrupt auto saves the regfile on stack.
428 This is programmable and can be optionally disabled in which case
429 software INTERRUPT_PROLOGUE/EPILGUE do the needed work
431 config ARC_LPB_DISABLE
432 bool "Disable loop buffer (LPB)"
434 On HS cores, loop buffer (LPB) is programmable in runtime and can
435 be optionally disabled.
439 endmenu # "ARC CPU Configuration"
441 config LINUX_LINK_BASE
442 hex "Kernel link address"
445 ARC700 divides the 32 bit phy address space into two equal halves
446 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
447 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
448 Typically Linux kernel is linked at the start of untransalted addr,
449 hence the default value of 0x8zs.
450 However some customers have peripherals mapped at this addr, so
451 Linux needs to be scooted a bit.
452 If you don't know what the above means, leave this setting alone.
453 This needs to match memory start address specified in Device Tree
455 config LINUX_RAM_BASE
456 hex "RAM base address"
457 default LINUX_LINK_BASE
459 By default Linux is linked at base of RAM. However in some special
460 cases (such as HSDK), Linux can't be linked at start of DDR, hence
464 bool "High Memory Support"
465 select HAVE_ARCH_PFN_VALID
468 With ARC 2G:2G address split, only upper 2G is directly addressable by
469 kernel. Enable this to potentially allow access to rest of 2G and PAE
473 bool "Support for the 40-bit Physical Address Extension"
476 select PHYS_ADDR_T_64BIT
478 Enable access to physical memory beyond 4G, only supported on
479 ARC cores with 40 bit Physical Addressing support
481 config ARC_KVADDR_SIZE
482 int "Kernel Virtual Address Space size (MB)"
486 The kernel address space is carved out of 256MB of translated address
487 space for catering to vmalloc, modules, pkmap, fixmap. This however may
488 not suffice vmalloc requirements of a 4K CPU EZChip system. So allow
489 this to be stretched to 512 MB (by extending into the reserved
492 config ARC_CURR_IN_REG
493 bool "Dedicate Register r25 for current_task pointer"
496 This reserved Register R25 to point to Current Task in
497 kernel mode. This saves memory access for each such access
500 config ARC_EMUL_UNALIGNED
501 bool "Emulate unaligned memory access (userspace only)"
502 select SYSCTL_ARCH_UNALIGN_NO_WARN
503 select SYSCTL_ARCH_UNALIGN_ALLOW
504 depends on ISA_ARCOMPACT
506 This enables misaligned 16 & 32 bit memory access from user space.
507 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
508 potential bugs in code
511 int "Timer Frequency"
514 config ARC_METAWARE_HLINK
515 bool "Support for Metaware debugger assisted Host access"
517 This options allows a Linux userland apps to directly access
518 host file system (open/creat/read/write etc) with help from
519 Metaware Debugger. This can come in handy for Linux-host communication
520 when there is no real usable peripheral such as EMAC.
528 config ARC_DW2_UNWIND
529 bool "Enable DWARF specific kernel stack unwind"
533 Compiles the kernel with DWARF unwind information and can be used
534 to get stack backtraces.
536 If you say Y here the resulting kernel image will be slightly larger
537 but not slower, and it will give very useful debugging information.
538 If you don't debug the kernel, you can say N, but we may not be able
539 to solve problems without frame unwind information
541 config ARC_DBG_JUMP_LABEL
542 bool "Paranoid checks in Static Keys (jump labels) code"
543 depends on JUMP_LABEL
544 default y if STATIC_KEYS_SELFTEST
546 Enable paranoid checks and self-test of both ARC-specific and generic
547 part of static keys (jump labels) related code.
550 config ARC_BUILTIN_DTB_NAME
551 string "Built in DTB"
553 Set the name of the DTB to embed in the vmlinux binary
554 Leaving it blank selects the minimal "skeleton" dtb
556 endmenu # "ARC Architecture Configuration"
558 config ARCH_FORCE_MAX_ORDER
559 int "Maximum zone order"
560 default "11" if ARC_HUGEPAGE_16M
563 source "kernel/power/Kconfig"