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_DMA_COHERENT_TO_PFN
10 select ARCH_HAS_PTE_SPECIAL
11 select ARCH_HAS_SETUP_DMA_OPS
12 select ARCH_HAS_SYNC_DMA_FOR_CPU
13 select ARCH_HAS_SYNC_DMA_FOR_DEVICE
14 select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC
15 select ARCH_32BIT_OFF_T
16 select BUILDTIME_EXTABLE_SORT
17 select CLONE_BACKWARDS
19 select GENERIC_ATOMIC64 if !ISA_ARCV2 || !(ARC_HAS_LL64 && ARC_HAS_LLSC)
20 select GENERIC_CLOCKEVENTS
21 select GENERIC_FIND_FIRST_BIT
22 # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
23 select GENERIC_IRQ_SHOW
24 select GENERIC_PCI_IOMAP
25 select GENERIC_PENDING_IRQ if SMP
26 select GENERIC_SCHED_CLOCK
27 select GENERIC_SMP_IDLE_THREAD
29 select HAVE_ARCH_TRACEHOOK
30 select HAVE_DEBUG_STACKOVERFLOW
31 select HAVE_FUTEX_CMPXCHG if FUTEX
32 select HAVE_IOREMAP_PROT
33 select HAVE_KERNEL_GZIP
34 select HAVE_KERNEL_LZMA
36 select HAVE_KRETPROBES
37 select HAVE_MOD_ARCH_SPECIFIC
39 select HAVE_PERF_EVENTS
40 select HANDLE_DOMAIN_IRQ
42 select MODULES_USE_ELF_RELA
44 select OF_EARLY_FLATTREE
45 select PCI_SYSCALL if PCI
46 select PERF_USE_VMALLOC if ARC_CACHE_VIPT_ALIASING
48 config ARCH_HAS_CACHE_LINE_SIZE
51 config TRACE_IRQFLAGS_SUPPORT
54 config LOCKDEP_SUPPORT
57 config SCHED_OMIT_FRAME_POINTER
63 config ARCH_DISCONTIGMEM_ENABLE
66 config ARCH_FLATMEM_ENABLE
75 config GENERIC_CALIBRATE_DELAY
78 config GENERIC_HWEIGHT
81 config STACKTRACE_SUPPORT
85 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
89 menu "ARC Architecture Configuration"
91 menu "ARC Platform/SoC/Board"
93 source "arch/arc/plat-tb10x/Kconfig"
94 source "arch/arc/plat-axs10x/Kconfig"
95 #New platform adds here
96 source "arch/arc/plat-eznps/Kconfig"
97 source "arch/arc/plat-hsdk/Kconfig"
102 prompt "ARC Instruction Set"
107 select CPU_NO_EFFICIENT_FFS
109 The original ARC ISA of ARC600/700 cores
113 select ARC_TIMERS_64BIT
115 ISA for the Next Generation ARC-HS cores
119 menu "ARC CPU Configuration"
123 default ARC_CPU_770 if ISA_ARCOMPACT
124 default ARC_CPU_HS if ISA_ARCV2
132 Support for ARC750 core
138 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
139 This core has a bunch of cool new features:
140 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
141 Shared Address Spaces (for sharing TLB entries in MMU)
142 -Caches: New Prog Model, Region Flush
143 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
151 Support for ARC HS38x Cores based on ARCv2 ISA
152 The notable features are:
153 - SMP configurations of upto 4 core with coherency
154 - Optional L2 Cache and IO-Coherency
155 - Revised Interrupt Architecture (multiple priorites, reg banks,
156 auto stack switch, auto regfile save/restore)
157 - MMUv4 (PIPT dcache, Huge Pages)
159 * 64bit load/store: LDD, STD
160 * Hardware assisted divide/remainder: DIV, REM
161 * Function prologue/epilogue: ENTER_S, LEAVE_S
162 * IRQ enable/disable: CLRI, SETI
163 * pop count: FFS, FLS
164 * SETcc, BMSKN, XBFU...
168 config CPU_BIG_ENDIAN
169 bool "Enable Big Endian Mode"
171 Build kernel for Big Endian Mode of ARC CPU
174 bool "Symmetric Multi-Processing"
175 select ARC_MCIP if ISA_ARCV2
177 This enables support for systems with more than one CPU.
182 int "Maximum number of CPUs (2-4096)"
186 config ARC_SMP_HALT_ON_RESET
187 bool "Enable Halt-on-reset boot mode"
189 In SMP configuration cores can be configured as Halt-on-reset
190 or they could all start at same time. For Halt-on-reset, non
191 masters are parked until Master kicks them so they can start of
192 at designated entry point. For other case, all jump to common
193 entry point and spin wait for Master's signal.
198 bool "ARConnect Multicore IP (MCIP) Support "
202 This IP block enables SMP in ARC-HS38 cores.
203 It provides for cross-core interrupts, multi-core debug
204 hardware semaphores, shared memory,....
207 bool "Enable Cache Support"
212 config ARC_CACHE_LINE_SHIFT
213 int "Cache Line Length (as power of 2)"
217 Starting with ARC700 4.9, Cache line length is configurable,
218 This option specifies "N", with Line-len = 2 power N
219 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
220 Linux only supports same line lengths for I and D caches.
222 config ARC_HAS_ICACHE
223 bool "Use Instruction Cache"
226 config ARC_HAS_DCACHE
227 bool "Use Data Cache"
230 config ARC_CACHE_PAGES
231 bool "Per Page Cache Control"
233 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
235 This can be used to over-ride the global I/D Cache Enable on a
236 per-page basis (but only for pages accessed via MMU such as
237 Kernel Virtual address or User Virtual Address)
238 TLB entries have a per-page Cache Enable Bit.
239 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
240 Global DISABLE + Per Page ENABLE won't work
242 config ARC_CACHE_VIPT_ALIASING
243 bool "Support VIPT Aliasing D$"
244 depends on ARC_HAS_DCACHE && ISA_ARCOMPACT
251 Single Cycle RAMS to store Fast Path Code
254 int "ICCM Size in KB"
256 depends on ARC_HAS_ICCM
261 Single Cycle RAMS to store Fast Path Data
264 int "DCCM Size in KB"
266 depends on ARC_HAS_DCCM
269 hex "DCCM map address"
271 depends on ARC_HAS_DCCM
275 default ARC_MMU_V3 if ARC_CPU_770
276 default ARC_MMU_V2 if ARC_CPU_750D
277 default ARC_MMU_V4 if ARC_CPU_HS
289 Fixed the deficiency of v1 - possible thrashing in memcpy scenario
290 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
294 depends on ARC_CPU_770
296 Introduced with ARC700 4.10: New Features
297 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
298 Shared Address Spaces (SASID)
310 prompt "MMU Page Size"
311 default ARC_PAGE_SIZE_8K
313 config ARC_PAGE_SIZE_8K
316 Choose between 8k vs 16k
318 config ARC_PAGE_SIZE_16K
320 depends on ARC_MMU_V3 || ARC_MMU_V4
322 config ARC_PAGE_SIZE_4K
324 depends on ARC_MMU_V3 || ARC_MMU_V4
329 prompt "MMU Super Page Size"
330 depends on ISA_ARCV2 && TRANSPARENT_HUGEPAGE
331 default ARC_HUGEPAGE_2M
333 config ARC_HUGEPAGE_2M
336 config ARC_HUGEPAGE_16M
342 int "Maximum NUMA Nodes (as a power of 2)"
343 default "0" if !DISCONTIGMEM
344 default "1" if DISCONTIGMEM
345 depends on NEED_MULTIPLE_NODES
347 Accessing memory beyond 1GB (with or w/o PAE) requires 2 memory
352 config ARC_COMPACT_IRQ_LEVELS
353 bool "Setup Timer IRQ as high Priority"
354 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
357 config ARC_FPU_SAVE_RESTORE
358 bool "Enable FPU state persistence across context switch"
360 Double Precision Floating Point unit had dedicated regs which
361 need to be saved/restored across context-switch.
362 Note that ARC FPU is overly simplistic, unlike say x86, which has
363 hardware pieces to allow software to conditionally save/restore,
364 based on actual usage of FPU by a task. Thus our implemn does
365 this for all tasks in system.
373 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
375 depends on !ARC_CANT_LLSC
378 bool "Insn: SWAPE (endian-swap)"
383 config ARC_USE_UNALIGNED_MEM_ACCESS
384 bool "Enable unaligned access in HW"
386 select HAVE_EFFICIENT_UNALIGNED_ACCESS
388 The ARC HS architecture supports unaligned memory access
389 which is disabled by default. Enable unaligned access in
390 hardware and use software to use it
393 bool "Insn: 64bit LDD/STD"
395 Enable gcc to generate 64-bit load/store instructions
396 ISA mandates even/odd registers to allow encoding of two
397 dest operands with 2 possible source operands.
400 config ARC_HAS_DIV_REM
401 bool "Insn: div, divu, rem, remu"
404 config ARC_HAS_ACCL_REGS
405 bool "Reg Pair ACCL:ACCH (FPU and/or MPY > 6)"
408 Depending on the configuration, CPU can contain accumulator reg-pair
409 (also referred to as r58:r59). These can also be used by gcc as GPR so
410 kernel needs to save/restore per process
412 config ARC_IRQ_NO_AUTOSAVE
413 bool "Disable hardware autosave regfile on interrupts"
416 On HS cores, taken interrupt auto saves the regfile on stack.
417 This is programmable and can be optionally disabled in which case
418 software INTERRUPT_PROLOGUE/EPILGUE do the needed work
422 endmenu # "ARC CPU Configuration"
424 config LINUX_LINK_BASE
425 hex "Kernel link address"
428 ARC700 divides the 32 bit phy address space into two equal halves
429 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
430 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
431 Typically Linux kernel is linked at the start of untransalted addr,
432 hence the default value of 0x8zs.
433 However some customers have peripherals mapped at this addr, so
434 Linux needs to be scooted a bit.
435 If you don't know what the above means, leave this setting alone.
436 This needs to match memory start address specified in Device Tree
438 config LINUX_RAM_BASE
439 hex "RAM base address"
440 default LINUX_LINK_BASE
442 By default Linux is linked at base of RAM. However in some special
443 cases (such as HSDK), Linux can't be linked at start of DDR, hence
447 bool "High Memory Support"
448 select ARCH_DISCONTIGMEM_ENABLE
450 With ARC 2G:2G address split, only upper 2G is directly addressable by
451 kernel. Enable this to potentially allow access to rest of 2G and PAE
455 bool "Support for the 40-bit Physical Address Extension"
458 select PHYS_ADDR_T_64BIT
460 Enable access to physical memory beyond 4G, only supported on
461 ARC cores with 40 bit Physical Addressing support
463 config ARC_KVADDR_SIZE
464 int "Kernel Virtual Address Space size (MB)"
468 The kernel address space is carved out of 256MB of translated address
469 space for catering to vmalloc, modules, pkmap, fixmap. This however may
470 not suffice vmalloc requirements of a 4K CPU EZChip system. So allow
471 this to be stretched to 512 MB (by extending into the reserved
474 config ARC_CURR_IN_REG
475 bool "Dedicate Register r25 for current_task pointer"
478 This reserved Register R25 to point to Current Task in
479 kernel mode. This saves memory access for each such access
482 config ARC_EMUL_UNALIGNED
483 bool "Emulate unaligned memory access (userspace only)"
484 select SYSCTL_ARCH_UNALIGN_NO_WARN
485 select SYSCTL_ARCH_UNALIGN_ALLOW
486 depends on ISA_ARCOMPACT
488 This enables misaligned 16 & 32 bit memory access from user space.
489 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
490 potential bugs in code
493 int "Timer Frequency"
496 config ARC_METAWARE_HLINK
497 bool "Support for Metaware debugger assisted Host access"
499 This options allows a Linux userland apps to directly access
500 host file system (open/creat/read/write etc) with help from
501 Metaware Debugger. This can come in handy for Linux-host communication
502 when there is no real usable peripheral such as EMAC.
510 config ARC_DW2_UNWIND
511 bool "Enable DWARF specific kernel stack unwind"
515 Compiles the kernel with DWARF unwind information and can be used
516 to get stack backtraces.
518 If you say Y here the resulting kernel image will be slightly larger
519 but not slower, and it will give very useful debugging information.
520 If you don't debug the kernel, you can say N, but we may not be able
521 to solve problems without frame unwind information
523 config ARC_DBG_TLB_PARANOIA
524 bool "Paranoia Checks in Low Level TLB Handlers"
528 config ARC_BUILTIN_DTB_NAME
529 string "Built in DTB"
531 Set the name of the DTB to embed in the vmlinux binary
532 Leaving it blank selects the minimal "skeleton" dtb
534 endmenu # "ARC Architecture Configuration"
536 config FORCE_MAX_ZONEORDER
537 int "Maximum zone order"
538 default "12" if ARC_HUGEPAGE_16M
541 source "kernel/power/Kconfig"