2 # Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 # This program is free software; you can redistribute it and/or modify
5 # it under the terms of the GNU General Public License version 2 as
6 # published by the Free Software Foundation.
11 select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC
12 select BUILDTIME_EXTABLE_SORT
14 select CLONE_BACKWARDS
15 # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
16 select DEVTMPFS if !INITRAMFS_SOURCE=""
17 select GENERIC_ATOMIC64
18 select GENERIC_CLOCKEVENTS
19 select GENERIC_FIND_FIRST_BIT
20 # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
21 select GENERIC_IRQ_SHOW
22 select GENERIC_PENDING_IRQ if SMP
23 select GENERIC_SMP_IDLE_THREAD
25 select HAVE_ARCH_TRACEHOOK
26 select HAVE_FUTEX_CMPXCHG
27 select HAVE_IOREMAP_PROT
29 select HAVE_KRETPROBES
31 select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
33 select HAVE_PERF_EVENTS
35 select MODULES_USE_ELF_RELA
38 select OF_EARLY_FLATTREE
39 select PERF_USE_VMALLOC
40 select HAVE_DEBUG_STACKOVERFLOW
42 config TRACE_IRQFLAGS_SUPPORT
45 config LOCKDEP_SUPPORT
48 config SCHED_OMIT_FRAME_POINTER
54 config RWSEM_GENERIC_SPINLOCK
57 config ARCH_FLATMEM_ENABLE
66 config GENERIC_CALIBRATE_DELAY
69 config GENERIC_HWEIGHT
72 config STACKTRACE_SUPPORT
76 config HAVE_LATENCYTOP_SUPPORT
80 source "kernel/Kconfig.freezer"
82 menu "ARC Architecture Configuration"
84 menu "ARC Platform/SoC/Board"
86 source "arch/arc/plat-sim/Kconfig"
87 source "arch/arc/plat-tb10x/Kconfig"
88 source "arch/arc/plat-axs10x/Kconfig"
89 #New platform adds here
94 prompt "ARC Instruction Set"
100 The original ARC ISA of ARC600/700 cores
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
122 Support for ARC750 core
128 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
129 This core has a bunch of cool new features:
130 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
131 Shared Address Spaces (for sharing TLB entires in MMU)
132 -Caches: New Prog Model, Region Flush
133 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
141 Support for ARC HS38x Cores based on ARCv2 ISA
142 The notable features are:
143 - SMP configurations of upto 4 core with coherency
144 - Optional L2 Cache and IO-Coherency
145 - Revised Interrupt Architecture (multiple priorites, reg banks,
146 auto stack switch, auto regfile save/restore)
147 - MMUv4 (PIPT dcache, Huge Pages)
149 * 64bit load/store: LDD, STD
150 * Hardware assisted divide/remainder: DIV, REM
151 * Function prologue/epilogue: ENTER_S, LEAVE_S
152 * IRQ enable/disable: CLRI, SETI
153 * pop count: FFS, FLS
154 * SETcc, BMSKN, XBFU...
158 config CPU_BIG_ENDIAN
159 bool "Enable Big Endian Mode"
162 Build kernel for Big Endian Mode of ARC CPU
165 bool "Symmetric Multi-Processing"
167 select ARC_HAS_COH_CACHES if ISA_ARCV2
168 select ARC_MCIP if ISA_ARCV2
170 This enables support for systems with more than one CPU.
174 config ARC_HAS_COH_CACHES
177 config ARC_HAS_REENTRANT_IRQ_LV2
181 bool "ARConnect Multicore IP (MCIP) Support "
184 This IP block enables SMP in ARC-HS38 cores.
185 It provides for cross-core interrupts, multi-core debug
186 hardware semaphores, shared memory,....
189 int "Maximum number of CPUs (2-4096)"
196 bool "Enable Cache Support"
198 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
199 depends on !SMP || ARC_HAS_COH_CACHES
203 config ARC_CACHE_LINE_SHIFT
204 int "Cache Line Length (as power of 2)"
208 Starting with ARC700 4.9, Cache line length is configurable,
209 This option specifies "N", with Line-len = 2 power N
210 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
211 Linux only supports same line lengths for I and D caches.
213 config ARC_HAS_ICACHE
214 bool "Use Instruction Cache"
217 config ARC_HAS_DCACHE
218 bool "Use Data Cache"
221 config ARC_CACHE_PAGES
222 bool "Per Page Cache Control"
224 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
226 This can be used to over-ride the global I/D Cache Enable on a
227 per-page basis (but only for pages accessed via MMU such as
228 Kernel Virtual address or User Virtual Address)
229 TLB entries have a per-page Cache Enable Bit.
230 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
231 Global DISABLE + Per Page ENABLE won't work
233 config ARC_CACHE_VIPT_ALIASING
234 bool "Support VIPT Aliasing D$"
235 depends on ARC_HAS_DCACHE && ISA_ARCOMPACT
243 Single Cycle RAMS to store Fast Path Code
247 int "ICCM Size in KB"
249 depends on ARC_HAS_ICCM
254 Single Cycle RAMS to store Fast Path Data
258 int "DCCM Size in KB"
260 depends on ARC_HAS_DCCM
263 hex "DCCM map address"
265 depends on ARC_HAS_DCCM
267 config ARC_HAS_HW_MPY
268 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
271 Influences how gcc generates code for MPY operations.
272 If enabled, MPYxx insns are generated, provided by Standard/XMAC
273 Multipler. Otherwise software multipy lib is used
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
289 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
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)
308 prompt "MMU Page Size"
309 default ARC_PAGE_SIZE_8K
311 config ARC_PAGE_SIZE_8K
314 Choose between 8k vs 16k
316 config ARC_PAGE_SIZE_16K
318 depends on ARC_MMU_V3 || ARC_MMU_V4
320 config ARC_PAGE_SIZE_4K
322 depends on ARC_MMU_V3 || ARC_MMU_V4
328 config ARC_COMPACT_IRQ_LEVELS
329 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
331 # Timer HAS to be high priority, for any other high priority config
333 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
334 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
336 if ARC_COMPACT_IRQ_LEVELS
347 endif #ARC_COMPACT_IRQ_LEVELS
349 config ARC_FPU_SAVE_RESTORE
350 bool "Enable FPU state persistence across context switch"
353 Double Precision Floating Point unit had dedictaed regs which
354 need to be saved/restored across context-switch.
355 Note that ARC FPU is overly simplistic, unlike say x86, which has
356 hardware pieces to allow software to conditionally save/restore,
357 based on actual usage of FPU by a task. Thus our implemn does
358 this for all tasks in system.
366 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
368 depends on !ARC_CANT_LLSC
370 config ARC_STAR_9000923308
371 bool "Workaround for llock/scond livelock"
373 depends on ISA_ARCV2 && SMP && ARC_HAS_LLSC
376 bool "Insn: SWAPE (endian-swap)"
382 bool "Insn: 64bit LDD/STD"
384 Enable gcc to generate 64-bit load/store instructions
385 ISA mandates even/odd registers to allow encoding of two
386 dest operands with 2 possible source operands.
389 config ARC_HAS_DIV_REM
390 bool "Insn: div, divu, rem, remu"
394 bool "Local 64-bit r/o cycle counter"
399 bool "SMP synchronized 64-bit cycle counter"
403 config ARC_NUMBER_OF_INTERRUPTS
404 int "Number of interrupts"
408 This defines the number of interrupts on the ARCv2HS core.
409 It affects the size of vector table.
410 The initial 8 IRQs are fixed (Timer, ICI etc) and although configurable
411 in hardware, it keep things simple for Linux to assume they are always
416 endmenu # "ARC CPU Configuration"
418 config LINUX_LINK_BASE
419 hex "Linux Link Address"
422 ARC700 divides the 32 bit phy address space into two equal halves
423 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
424 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
425 Typically Linux kernel is linked at the start of untransalted addr,
426 hence the default value of 0x8zs.
427 However some customers have peripherals mapped at this addr, so
428 Linux needs to be scooted a bit.
429 If you don't know what the above means, leave this setting alone.
431 config ARC_CURR_IN_REG
432 bool "Dedicate Register r25 for current_task pointer"
435 This reserved Register R25 to point to Current Task in
436 kernel mode. This saves memory access for each such access
439 config ARC_EMUL_UNALIGNED
440 bool "Emulate unaligned memory access (userspace only)"
442 select SYSCTL_ARCH_UNALIGN_NO_WARN
443 select SYSCTL_ARCH_UNALIGN_ALLOW
444 depends on ISA_ARCOMPACT
446 This enables misaligned 16 & 32 bit memory access from user space.
447 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
448 potential bugs in code
451 int "Timer Frequency"
454 config ARC_METAWARE_HLINK
455 bool "Support for Metaware debugger assisted Host access"
458 This options allows a Linux userland apps to directly access
459 host file system (open/creat/read/write etc) with help from
460 Metaware Debugger. This can come in handy for Linux-host communication
461 when there is no real usable peripheral such as EMAC.
469 config ARC_DW2_UNWIND
470 bool "Enable DWARF specific kernel stack unwind"
474 Compiles the kernel with DWARF unwind information and can be used
475 to get stack backtraces.
477 If you say Y here the resulting kernel image will be slightly larger
478 but not slower, and it will give very useful debugging information.
479 If you don't debug the kernel, you can say N, but we may not be able
480 to solve problems without frame unwind information
482 config ARC_DBG_TLB_PARANOIA
483 bool "Paranoia Checks in Low Level TLB Handlers"
486 config ARC_DBG_TLB_MISS_COUNT
487 bool "Profile TLB Misses"
491 Counts number of I and D TLB Misses and exports them via Debugfs
492 The counters can be cleared via Debugfs as well
497 bool "Debug Inter Core interrupts"
504 config ARC_UBOOT_SUPPORT
505 bool "Support uboot arg Handling"
508 ARC Linux by default checks for uboot provided args as pointers to
509 external cmdline or DTB. This however breaks in absence of uboot,
510 when booting from Metaware debugger directly, as the registers are
511 not zeroed out on reset by mdb and/or ARCv2 based cores. The bogus
512 registers look like uboot args to kernel which then chokes.
513 So only enable the uboot arg checking/processing if users are sure
514 of uboot being in play.
516 config ARC_BUILTIN_DTB_NAME
517 string "Built in DTB"
519 Set the name of the DTB to embed in the vmlinux binary
520 Leaving it blank selects the minimal "skeleton" dtb
522 source "kernel/Kconfig.preempt"
524 menu "Executable file formats"
525 source "fs/Kconfig.binfmt"
528 endmenu # "ARC Architecture Configuration"
532 source "drivers/Kconfig"
534 source "arch/arc/Kconfig.debug"
535 source "security/Kconfig"
536 source "crypto/Kconfig"
538 source "kernel/power/Kconfig"