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_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_EXTABLE_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_CLOCKEVENTS
23 select GENERIC_FIND_FIRST_BIT
24 # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
25 select GENERIC_IRQ_SHOW
26 select GENERIC_PCI_IOMAP
27 select GENERIC_PENDING_IRQ if SMP
28 select GENERIC_SCHED_CLOCK
29 select GENERIC_SMP_IDLE_THREAD
31 select HAVE_ARCH_TRACEHOOK
32 select HAVE_DEBUG_STACKOVERFLOW
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
50 config ARCH_HAS_CACHE_LINE_SIZE
53 config TRACE_IRQFLAGS_SUPPORT
56 config LOCKDEP_SUPPORT
59 config SCHED_OMIT_FRAME_POINTER
65 config ARCH_DISCONTIGMEM_ENABLE
68 config ARCH_FLATMEM_ENABLE
77 config GENERIC_CALIBRATE_DELAY
80 config GENERIC_HWEIGHT
83 config STACKTRACE_SUPPORT
87 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
91 menu "ARC Architecture Configuration"
93 menu "ARC Platform/SoC/Board"
95 source "arch/arc/plat-tb10x/Kconfig"
96 source "arch/arc/plat-axs10x/Kconfig"
97 #New platform adds here
98 source "arch/arc/plat-eznps/Kconfig"
99 source "arch/arc/plat-hsdk/Kconfig"
104 prompt "ARC Instruction Set"
109 select CPU_NO_EFFICIENT_FFS
111 The original ARC ISA of ARC600/700 cores
115 select ARC_TIMERS_64BIT
117 ISA for the Next Generation ARC-HS cores
121 menu "ARC CPU Configuration"
125 default ARC_CPU_770 if ISA_ARCOMPACT
126 default ARC_CPU_HS if ISA_ARCV2
134 Support for ARC750 core
140 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
141 This core has a bunch of cool new features:
142 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
143 Shared Address Spaces (for sharing TLB entries in MMU)
144 -Caches: New Prog Model, Region Flush
145 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
153 Support for ARC HS38x Cores based on ARCv2 ISA
154 The notable features are:
155 - SMP configurations of upto 4 core with coherency
156 - Optional L2 Cache and IO-Coherency
157 - Revised Interrupt Architecture (multiple priorites, reg banks,
158 auto stack switch, auto regfile save/restore)
159 - MMUv4 (PIPT dcache, Huge Pages)
161 * 64bit load/store: LDD, STD
162 * Hardware assisted divide/remainder: DIV, REM
163 * Function prologue/epilogue: ENTER_S, LEAVE_S
164 * IRQ enable/disable: CLRI, SETI
165 * pop count: FFS, FLS
166 * SETcc, BMSKN, XBFU...
170 config CPU_BIG_ENDIAN
171 bool "Enable Big Endian Mode"
173 Build kernel for Big Endian Mode of ARC CPU
176 bool "Symmetric Multi-Processing"
177 select ARC_MCIP if ISA_ARCV2
179 This enables support for systems with more than one CPU.
184 int "Maximum number of CPUs (2-4096)"
188 config ARC_SMP_HALT_ON_RESET
189 bool "Enable Halt-on-reset boot mode"
191 In SMP configuration cores can be configured as Halt-on-reset
192 or they could all start at same time. For Halt-on-reset, non
193 masters are parked until Master kicks them so they can start of
194 at designated entry point. For other case, all jump to common
195 entry point and spin wait for Master's signal.
200 bool "ARConnect Multicore IP (MCIP) Support "
204 This IP block enables SMP in ARC-HS38 cores.
205 It provides for cross-core interrupts, multi-core debug
206 hardware semaphores, shared memory,....
209 bool "Enable Cache Support"
214 config ARC_CACHE_LINE_SHIFT
215 int "Cache Line Length (as power of 2)"
219 Starting with ARC700 4.9, Cache line length is configurable,
220 This option specifies "N", with Line-len = 2 power N
221 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
222 Linux only supports same line lengths for I and D caches.
224 config ARC_HAS_ICACHE
225 bool "Use Instruction Cache"
228 config ARC_HAS_DCACHE
229 bool "Use Data Cache"
232 config ARC_CACHE_PAGES
233 bool "Per Page Cache Control"
235 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
237 This can be used to over-ride the global I/D Cache Enable on a
238 per-page basis (but only for pages accessed via MMU such as
239 Kernel Virtual address or User Virtual Address)
240 TLB entries have a per-page Cache Enable Bit.
241 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
242 Global DISABLE + Per Page ENABLE won't work
244 config ARC_CACHE_VIPT_ALIASING
245 bool "Support VIPT Aliasing D$"
246 depends on ARC_HAS_DCACHE && ISA_ARCOMPACT
253 Single Cycle RAMS to store Fast Path Code
256 int "ICCM Size in KB"
258 depends on ARC_HAS_ICCM
263 Single Cycle RAMS to store Fast Path Data
266 int "DCCM Size in KB"
268 depends on ARC_HAS_DCCM
271 hex "DCCM map address"
273 depends on ARC_HAS_DCCM
277 default ARC_MMU_V3 if ARC_CPU_770
278 default ARC_MMU_V2 if ARC_CPU_750D
279 default ARC_MMU_V4 if ARC_CPU_HS
291 Fixed the deficiency of v1 - possible thrashing in memcpy scenario
292 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
296 depends on ARC_CPU_770
298 Introduced with ARC700 4.10: New Features
299 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
300 Shared Address Spaces (SASID)
312 prompt "MMU Page Size"
313 default ARC_PAGE_SIZE_8K
315 config ARC_PAGE_SIZE_8K
318 Choose between 8k vs 16k
320 config ARC_PAGE_SIZE_16K
322 depends on ARC_MMU_V3 || ARC_MMU_V4
324 config ARC_PAGE_SIZE_4K
326 depends on ARC_MMU_V3 || ARC_MMU_V4
331 prompt "MMU Super Page Size"
332 depends on ISA_ARCV2 && TRANSPARENT_HUGEPAGE
333 default ARC_HUGEPAGE_2M
335 config ARC_HUGEPAGE_2M
338 config ARC_HUGEPAGE_16M
344 int "Maximum NUMA Nodes (as a power of 2)"
345 default "0" if !DISCONTIGMEM
346 default "1" if DISCONTIGMEM
347 depends on NEED_MULTIPLE_NODES
349 Accessing memory beyond 1GB (with or w/o PAE) requires 2 memory
354 config ARC_COMPACT_IRQ_LEVELS
355 bool "Setup Timer IRQ as high Priority"
356 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
359 config ARC_FPU_SAVE_RESTORE
360 bool "Enable FPU state persistence across context switch"
362 Double Precision Floating Point unit had dedicated regs which
363 need to be saved/restored across context-switch.
364 Note that ARC FPU is overly simplistic, unlike say x86, which has
365 hardware pieces to allow software to conditionally save/restore,
366 based on actual usage of FPU by a task. Thus our implemn does
367 this for all tasks in system.
375 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
377 depends on !ARC_CANT_LLSC
380 bool "Insn: SWAPE (endian-swap)"
385 config ARC_USE_UNALIGNED_MEM_ACCESS
386 bool "Enable unaligned access in HW"
388 select HAVE_EFFICIENT_UNALIGNED_ACCESS
390 The ARC HS architecture supports unaligned memory access
391 which is disabled by default. Enable unaligned access in
392 hardware and use software to use it
395 bool "Insn: 64bit LDD/STD"
397 Enable gcc to generate 64-bit load/store instructions
398 ISA mandates even/odd registers to allow encoding of two
399 dest operands with 2 possible source operands.
402 config ARC_HAS_DIV_REM
403 bool "Insn: div, divu, rem, remu"
406 config ARC_HAS_ACCL_REGS
407 bool "Reg Pair ACCL:ACCH (FPU and/or MPY > 6)"
410 Depending on the configuration, CPU can contain accumulator reg-pair
411 (also referred to as r58:r59). These can also be used by gcc as GPR so
412 kernel needs to save/restore per process
414 config ARC_IRQ_NO_AUTOSAVE
415 bool "Disable hardware autosave regfile on interrupts"
418 On HS cores, taken interrupt auto saves the regfile on stack.
419 This is programmable and can be optionally disabled in which case
420 software INTERRUPT_PROLOGUE/EPILGUE do the needed work
424 endmenu # "ARC CPU Configuration"
426 config LINUX_LINK_BASE
427 hex "Kernel link address"
430 ARC700 divides the 32 bit phy address space into two equal halves
431 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
432 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
433 Typically Linux kernel is linked at the start of untransalted addr,
434 hence the default value of 0x8zs.
435 However some customers have peripherals mapped at this addr, so
436 Linux needs to be scooted a bit.
437 If you don't know what the above means, leave this setting alone.
438 This needs to match memory start address specified in Device Tree
440 config LINUX_RAM_BASE
441 hex "RAM base address"
442 default LINUX_LINK_BASE
444 By default Linux is linked at base of RAM. However in some special
445 cases (such as HSDK), Linux can't be linked at start of DDR, hence
449 bool "High Memory Support"
450 select ARCH_DISCONTIGMEM_ENABLE
452 With ARC 2G:2G address split, only upper 2G is directly addressable by
453 kernel. Enable this to potentially allow access to rest of 2G and PAE
457 bool "Support for the 40-bit Physical Address Extension"
460 select PHYS_ADDR_T_64BIT
462 Enable access to physical memory beyond 4G, only supported on
463 ARC cores with 40 bit Physical Addressing support
465 config ARC_KVADDR_SIZE
466 int "Kernel Virtual Address Space size (MB)"
470 The kernel address space is carved out of 256MB of translated address
471 space for catering to vmalloc, modules, pkmap, fixmap. This however may
472 not suffice vmalloc requirements of a 4K CPU EZChip system. So allow
473 this to be stretched to 512 MB (by extending into the reserved
476 config ARC_CURR_IN_REG
477 bool "Dedicate Register r25 for current_task pointer"
480 This reserved Register R25 to point to Current Task in
481 kernel mode. This saves memory access for each such access
484 config ARC_EMUL_UNALIGNED
485 bool "Emulate unaligned memory access (userspace only)"
486 select SYSCTL_ARCH_UNALIGN_NO_WARN
487 select SYSCTL_ARCH_UNALIGN_ALLOW
488 depends on ISA_ARCOMPACT
490 This enables misaligned 16 & 32 bit memory access from user space.
491 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
492 potential bugs in code
495 int "Timer Frequency"
498 config ARC_METAWARE_HLINK
499 bool "Support for Metaware debugger assisted Host access"
501 This options allows a Linux userland apps to directly access
502 host file system (open/creat/read/write etc) with help from
503 Metaware Debugger. This can come in handy for Linux-host communication
504 when there is no real usable peripheral such as EMAC.
512 config ARC_DW2_UNWIND
513 bool "Enable DWARF specific kernel stack unwind"
517 Compiles the kernel with DWARF unwind information and can be used
518 to get stack backtraces.
520 If you say Y here the resulting kernel image will be slightly larger
521 but not slower, and it will give very useful debugging information.
522 If you don't debug the kernel, you can say N, but we may not be able
523 to solve problems without frame unwind information
525 config ARC_DBG_TLB_PARANOIA
526 bool "Paranoia Checks in Low Level TLB Handlers"
530 config ARC_BUILTIN_DTB_NAME
531 string "Built in DTB"
533 Set the name of the DTB to embed in the vmlinux binary
534 Leaving it blank selects the minimal "skeleton" dtb
536 endmenu # "ARC Architecture Configuration"
538 config FORCE_MAX_ZONEORDER
539 int "Maximum zone order"
540 default "12" if ARC_HUGEPAGE_16M
543 source "kernel/power/Kconfig"