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 BUILDTIME_EXTABLE_SORT
13 select CLONE_BACKWARDS
14 # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
15 select DEVTMPFS if !INITRAMFS_SOURCE=""
16 select GENERIC_ATOMIC64
17 select GENERIC_CLOCKEVENTS
18 select GENERIC_FIND_FIRST_BIT
19 # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
20 select GENERIC_IRQ_SHOW
21 select GENERIC_PENDING_IRQ if SMP
22 select GENERIC_SMP_IDLE_THREAD
24 select HAVE_ARCH_TRACEHOOK
25 select HAVE_IOREMAP_PROT
27 select HAVE_KRETPROBES
29 select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
31 select HAVE_PERF_EVENTS
33 select MODULES_USE_ELF_RELA
36 select OF_EARLY_FLATTREE
37 select PERF_USE_VMALLOC
38 select HAVE_DEBUG_STACKOVERFLOW
40 config TRACE_IRQFLAGS_SUPPORT
43 config LOCKDEP_SUPPORT
46 config SCHED_OMIT_FRAME_POINTER
52 config RWSEM_GENERIC_SPINLOCK
55 config ARCH_FLATMEM_ENABLE
64 config GENERIC_CALIBRATE_DELAY
67 config GENERIC_HWEIGHT
70 config STACKTRACE_SUPPORT
74 config HAVE_LATENCYTOP_SUPPORT
78 source "kernel/Kconfig.freezer"
80 menu "ARC Architecture Configuration"
82 menu "ARC Platform/SoC/Board"
84 source "arch/arc/plat-sim/Kconfig"
85 source "arch/arc/plat-tb10x/Kconfig"
86 source "arch/arc/plat-axs10x/Kconfig"
87 #New platform adds here
92 prompt "ARC Instruction Set"
98 The original ARC ISA of ARC600/700 cores
103 ISA for the Next Generation ARC-HS cores
107 menu "ARC CPU Configuration"
111 default ARC_CPU_770 if ISA_ARCOMPACT
112 default ARC_CPU_HS if ISA_ARCV2
119 Support for ARC750 core
125 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
126 This core has a bunch of cool new features:
127 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
128 Shared Address Spaces (for sharing TLB entires in MMU)
129 -Caches: New Prog Model, Region Flush
130 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
138 Support for ARC HS38x Cores based on ARCv2 ISA
139 The notable features are:
140 - SMP configurations of upto 4 core with coherency
141 - Optional L2 Cache and IO-Coherency
142 - Revised Interrupt Architecture (multiple priorites, reg banks,
143 auto stack switch, auto regfile save/restore)
144 - MMUv4 (PIPT dcache, Huge Pages)
146 * 64bit load/store: LDD, STD
147 * Hardware assisted divide/remainder: DIV, REM
148 * Function prologue/epilogue: ENTER_S, LEAVE_S
149 * IRQ enable/disable: CLRI, SETI
150 * pop count: FFS, FLS
151 * SETcc, BMSKN, XBFU...
155 config CPU_BIG_ENDIAN
156 bool "Enable Big Endian Mode"
159 Build kernel for Big Endian Mode of ARC CPU
162 bool "Symmetric Multi-Processing"
164 select ARC_HAS_COH_CACHES if ISA_ARCV2
165 select ARC_MCIP if ISA_ARCV2
167 This enables support for systems with more than one CPU.
171 config ARC_HAS_COH_CACHES
174 config ARC_HAS_REENTRANT_IRQ_LV2
178 bool "ARConnect Multicore IP (MCIP) Support "
181 This IP block enables SMP in ARC-HS38 cores.
182 It provides for cross-core interrupts, multi-core debug
183 hardware semaphores, shared memory,....
186 int "Maximum number of CPUs (2-4096)"
193 bool "Enable Cache Support"
195 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
196 depends on !SMP || ARC_HAS_COH_CACHES
200 config ARC_CACHE_LINE_SHIFT
201 int "Cache Line Length (as power of 2)"
205 Starting with ARC700 4.9, Cache line length is configurable,
206 This option specifies "N", with Line-len = 2 power N
207 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
208 Linux only supports same line lengths for I and D caches.
210 config ARC_HAS_ICACHE
211 bool "Use Instruction Cache"
214 config ARC_HAS_DCACHE
215 bool "Use Data Cache"
218 config ARC_CACHE_PAGES
219 bool "Per Page Cache Control"
221 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
223 This can be used to over-ride the global I/D Cache Enable on a
224 per-page basis (but only for pages accessed via MMU such as
225 Kernel Virtual address or User Virtual Address)
226 TLB entries have a per-page Cache Enable Bit.
227 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
228 Global DISABLE + Per Page ENABLE won't work
230 config ARC_CACHE_VIPT_ALIASING
231 bool "Support VIPT Aliasing D$"
232 depends on ARC_HAS_DCACHE && ISA_ARCOMPACT
240 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
255 int "DCCM Size in KB"
257 depends on ARC_HAS_DCCM
260 hex "DCCM map address"
262 depends on ARC_HAS_DCCM
264 config ARC_HAS_HW_MPY
265 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
268 Influences how gcc generates code for MPY operations.
269 If enabled, MPYxx insns are generated, provided by Standard/XMAC
270 Multipler. Otherwise software multipy lib is used
274 default ARC_MMU_V3 if ARC_CPU_770
275 default ARC_MMU_V2 if ARC_CPU_750D
276 default ARC_MMU_V4 if ARC_CPU_HS
286 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
287 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
291 depends on ARC_CPU_770
293 Introduced with ARC700 4.10: New Features
294 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
295 Shared Address Spaces (SASID)
305 prompt "MMU Page Size"
306 default ARC_PAGE_SIZE_8K
308 config ARC_PAGE_SIZE_8K
311 Choose between 8k vs 16k
313 config ARC_PAGE_SIZE_16K
315 depends on ARC_MMU_V3
317 config ARC_PAGE_SIZE_4K
319 depends on ARC_MMU_V3
325 config ARC_COMPACT_IRQ_LEVELS
326 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
328 # Timer HAS to be high priority, for any other high priority config
330 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
331 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
333 if ARC_COMPACT_IRQ_LEVELS
344 endif #ARC_COMPACT_IRQ_LEVELS
346 config ARC_FPU_SAVE_RESTORE
347 bool "Enable FPU state persistence across context switch"
350 Double Precision Floating Point unit had dedictaed regs which
351 need to be saved/restored across context-switch.
352 Note that ARC FPU is overly simplistic, unlike say x86, which has
353 hardware pieces to allow software to conditionally save/restore,
354 based on actual usage of FPU by a task. Thus our implemn does
355 this for all tasks in system.
363 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
365 depends on !ARC_CPU_750D && !ARC_CANT_LLSC
368 bool "Insn: SWAPE (endian-swap)"
374 bool "Insn: 64bit LDD/STD"
376 Enable gcc to generate 64-bit load/store instructions
377 ISA mandates even/odd registers to allow encoding of two
378 dest operands with 2 possible source operands.
382 bool "Local 64-bit r/o cycle counter"
387 bool "SMP synchronized 64-bit cycle counter"
391 config ARC_NUMBER_OF_INTERRUPTS
392 int "Number of interrupts"
396 This defines the number of interrupts on the ARCv2HS core.
397 It affects the size of vector table.
398 The initial 8 IRQs are fixed (Timer, ICI etc) and although configurable
399 in hardware, it keep things simple for Linux to assume they are always
404 endmenu # "ARC CPU Configuration"
406 config LINUX_LINK_BASE
407 hex "Linux Link Address"
410 ARC700 divides the 32 bit phy address space into two equal halves
411 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
412 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
413 Typically Linux kernel is linked at the start of untransalted addr,
414 hence the default value of 0x8zs.
415 However some customers have peripherals mapped at this addr, so
416 Linux needs to be scooted a bit.
417 If you don't know what the above means, leave this setting alone.
419 config ARC_CURR_IN_REG
420 bool "Dedicate Register r25 for current_task pointer"
423 This reserved Register R25 to point to Current Task in
424 kernel mode. This saves memory access for each such access
427 config ARC_EMUL_UNALIGNED
428 bool "Emulate unaligned memory access (userspace only)"
430 select SYSCTL_ARCH_UNALIGN_NO_WARN
431 select SYSCTL_ARCH_UNALIGN_ALLOW
432 depends on ISA_ARCOMPACT
434 This enables misaligned 16 & 32 bit memory access from user space.
435 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
436 potential bugs in code
439 int "Timer Frequency"
442 config ARC_METAWARE_HLINK
443 bool "Support for Metaware debugger assisted Host access"
446 This options allows a Linux userland apps to directly access
447 host file system (open/creat/read/write etc) with help from
448 Metaware Debugger. This can come in handy for Linux-host communication
449 when there is no real usable peripheral such as EMAC.
457 config ARC_DW2_UNWIND
458 bool "Enable DWARF specific kernel stack unwind"
462 Compiles the kernel with DWARF unwind information and can be used
463 to get stack backtraces.
465 If you say Y here the resulting kernel image will be slightly larger
466 but not slower, and it will give very useful debugging information.
467 If you don't debug the kernel, you can say N, but we may not be able
468 to solve problems without frame unwind information
470 config ARC_DBG_TLB_PARANOIA
471 bool "Paranoia Checks in Low Level TLB Handlers"
474 config ARC_DBG_TLB_MISS_COUNT
475 bool "Profile TLB Misses"
479 Counts number of I and D TLB Misses and exports them via Debugfs
480 The counters can be cleared via Debugfs as well
485 bool "Debug Inter Core interrupts"
492 config ARC_UBOOT_SUPPORT
493 bool "Support uboot arg Handling"
496 ARC Linux by default checks for uboot provided args as pointers to
497 external cmdline or DTB. This however breaks in absence of uboot,
498 when booting from Metaware debugger directly, as the registers are
499 not zeroed out on reset by mdb and/or ARCv2 based cores. The bogus
500 registers look like uboot args to kernel which then chokes.
501 So only enable the uboot arg checking/processing if users are sure
502 of uboot being in play.
504 config ARC_BUILTIN_DTB_NAME
505 string "Built in DTB"
507 Set the name of the DTB to embed in the vmlinux binary
508 Leaving it blank selects the minimal "skeleton" dtb
510 source "kernel/Kconfig.preempt"
512 menu "Executable file formats"
513 source "fs/Kconfig.binfmt"
516 endmenu # "ARC Architecture Configuration"
520 source "drivers/Kconfig"
522 source "arch/arc/Kconfig.debug"
523 source "security/Kconfig"
524 source "crypto/Kconfig"
526 source "kernel/power/Kconfig"