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 #New platform adds here
90 menu "ARC CPU Configuration"
99 Support for ARC750 core
105 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
106 This core has a bunch of cool new features:
107 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
108 Shared Address Spaces (for sharing TLB entires in MMU)
109 -Caches: New Prog Model, Region Flush
110 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
114 config CPU_BIG_ENDIAN
115 bool "Enable Big Endian Mode"
118 Build kernel for Big Endian Mode of ARC CPU
121 bool "Symmetric Multi-Processing (Incomplete)"
124 This enables support for systems with more than one CPU. If you have
125 a system with only one CPU, say N. If you have a system with more
130 config ARC_HAS_COH_CACHES
133 config ARC_HAS_REENTRANT_IRQ_LV2
139 int "Maximum number of CPUs (2-4096)"
145 bool "Enable Cache Support"
147 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
148 depends on !SMP || ARC_HAS_COH_CACHES
152 config ARC_CACHE_LINE_SHIFT
153 int "Cache Line Length (as power of 2)"
157 Starting with ARC700 4.9, Cache line length is configurable,
158 This option specifies "N", with Line-len = 2 power N
159 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
160 Linux only supports same line lengths for I and D caches.
162 config ARC_HAS_ICACHE
163 bool "Use Instruction Cache"
166 config ARC_HAS_DCACHE
167 bool "Use Data Cache"
170 config ARC_CACHE_PAGES
171 bool "Per Page Cache Control"
173 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
175 This can be used to over-ride the global I/D Cache Enable on a
176 per-page basis (but only for pages accessed via MMU such as
177 Kernel Virtual address or User Virtual Address)
178 TLB entries have a per-page Cache Enable Bit.
179 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
180 Global DISABLE + Per Page ENABLE won't work
182 config ARC_CACHE_VIPT_ALIASING
183 bool "Support VIPT Aliasing D$"
184 depends on ARC_HAS_DCACHE
192 Single Cycle RAMS to store Fast Path Code
196 int "ICCM Size in KB"
198 depends on ARC_HAS_ICCM
203 Single Cycle RAMS to store Fast Path Data
207 int "DCCM Size in KB"
209 depends on ARC_HAS_DCCM
212 hex "DCCM map address"
214 depends on ARC_HAS_DCCM
216 config ARC_HAS_HW_MPY
217 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
220 Influences how gcc generates code for MPY operations.
221 If enabled, MPYxx insns are generated, provided by Standard/XMAC
222 Multipler. Otherwise software multipy lib is used
225 prompt "ARC700 MMU Version"
226 default ARC_MMU_V3 if ARC_CPU_770
227 default ARC_MMU_V2 if ARC_CPU_750D
237 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
238 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
242 depends on ARC_CPU_770
244 Introduced with ARC700 4.10: New Features
245 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
246 Shared Address Spaces (SASID)
252 prompt "MMU Page Size"
253 default ARC_PAGE_SIZE_8K
255 config ARC_PAGE_SIZE_8K
258 Choose between 8k vs 16k
260 config ARC_PAGE_SIZE_16K
262 depends on ARC_MMU_V3
264 config ARC_PAGE_SIZE_4K
266 depends on ARC_MMU_V3
270 config ARC_COMPACT_IRQ_LEVELS
271 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
273 # Timer HAS to be high priority, for any other high priority config
275 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
276 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
278 if ARC_COMPACT_IRQ_LEVELS
291 config ARC_FPU_SAVE_RESTORE
292 bool "Enable FPU state persistence across context switch"
295 Double Precision Floating Point unit had dedictaed regs which
296 need to be saved/restored across context-switch.
297 Note that ARC FPU is overly simplistic, unlike say x86, which has
298 hardware pieces to allow software to conditionally save/restore,
299 based on actual usage of FPU by a task. Thus our implemn does
300 this for all tasks in system.
306 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
308 depends on ARC_CPU_770 && !ARC_CANT_LLSC
311 bool "Insn: SWAPE (endian-swap)"
314 endmenu # "ARC CPU Configuration"
316 config LINUX_LINK_BASE
317 hex "Linux Link Address"
320 ARC700 divides the 32 bit phy address space into two equal halves
321 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
322 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
323 Typically Linux kernel is linked at the start of untransalted addr,
324 hence the default value of 0x8zs.
325 However some customers have peripherals mapped at this addr, so
326 Linux needs to be scooted a bit.
327 If you don't know what the above means, leave this setting alone.
329 config ARC_CURR_IN_REG
330 bool "Dedicate Register r25 for current_task pointer"
333 This reserved Register R25 to point to Current Task in
334 kernel mode. This saves memory access for each such access
337 config ARC_EMUL_UNALIGNED
338 bool "Emulate unaligned memory access (userspace only)"
339 select SYSCTL_ARCH_UNALIGN_NO_WARN
340 select SYSCTL_ARCH_UNALIGN_ALLOW
342 This enables misaligned 16 & 32 bit memory access from user space.
343 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
344 potential bugs in code
347 int "Timer Frequency"
350 config ARC_METAWARE_HLINK
351 bool "Support for Metaware debugger assisted Host access"
354 This options allows a Linux userland apps to directly access
355 host file system (open/creat/read/write etc) with help from
356 Metaware Debugger. This can come in handy for Linux-host communication
357 when there is no real usable peripheral such as EMAC.
363 config ARC_DW2_UNWIND
364 bool "Enable DWARF specific kernel stack unwind"
369 Compiles the kernel with DWARF unwind information and can be used
370 to get stack backtraces.
372 If you say Y here the resulting kernel image will be slightly larger
373 but not slower, and it will give very useful debugging information.
374 If you don't debug the kernel, you can say N, but we may not be able
375 to solve problems without frame unwind information
377 config ARC_DBG_TLB_PARANOIA
378 bool "Paranoia Checks in Low Level TLB Handlers"
382 config ARC_DBG_TLB_MISS_COUNT
383 bool "Profile TLB Misses"
388 Counts number of I and D TLB Misses and exports them via Debugfs
389 The counters can be cleared via Debugfs as well
391 config ARC_BUILTIN_DTB_NAME
392 string "Built in DTB"
394 Set the name of the DTB to embed in the vmlinux binary
395 Leaving it blank selects the minimal "skeleton" dtb
397 source "kernel/Kconfig.preempt"
399 menu "Executable file formats"
400 source "fs/Kconfig.binfmt"
403 endmenu # "ARC Architecture Configuration"
407 source "drivers/Kconfig"
409 source "arch/arc/Kconfig.debug"
410 source "security/Kconfig"
411 source "crypto/Kconfig"
413 source "kernel/power/Kconfig"