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
81 source "kernel/Kconfig.freezer"
83 menu "ARC Architecture Configuration"
85 menu "ARC Platform/SoC/Board"
87 source "arch/arc/plat-arcfpga/Kconfig"
88 source "arch/arc/plat-tb10x/Kconfig"
89 #New platform adds here
93 menu "ARC CPU Configuration"
102 Support for ARC750 core
106 select ARC_CPU_REL_4_10
108 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
109 This core has a bunch of cool new features:
110 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
111 Shared Address Spaces (for sharing TLB entires in MMU)
112 -Caches: New Prog Model, Region Flush
113 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
117 config CPU_BIG_ENDIAN
118 bool "Enable Big Endian Mode"
121 Build kernel for Big Endian Mode of ARC CPU
123 # If a platform can't work with 0x8000_0000 based dma_addr_t
124 config ARC_PLAT_NEEDS_CPU_TO_DMA
128 bool "Symmetric Multi-Processing (Incomplete)"
131 This enables support for systems with more than one CPU. If you have
132 a system with only one CPU, say N. If you have a system with more
137 config ARC_HAS_COH_CACHES
140 config ARC_HAS_REENTRANT_IRQ_LV2
146 int "Maximum number of CPUs (2-4096)"
152 bool "Enable Cache Support"
154 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
155 depends on !SMP || ARC_HAS_COH_CACHES
159 config ARC_CACHE_LINE_SHIFT
160 int "Cache Line Length (as power of 2)"
164 Starting with ARC700 4.9, Cache line length is configurable,
165 This option specifies "N", with Line-len = 2 power N
166 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
167 Linux only supports same line lengths for I and D caches.
169 config ARC_HAS_ICACHE
170 bool "Use Instruction Cache"
173 config ARC_HAS_DCACHE
174 bool "Use Data Cache"
177 config ARC_CACHE_PAGES
178 bool "Per Page Cache Control"
180 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
182 This can be used to over-ride the global I/D Cache Enable on a
183 per-page basis (but only for pages accessed via MMU such as
184 Kernel Virtual address or User Virtual Address)
185 TLB entries have a per-page Cache Enable Bit.
186 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
187 Global DISABLE + Per Page ENABLE won't work
189 config ARC_CACHE_VIPT_ALIASING
190 bool "Support VIPT Aliasing D$"
191 depends on ARC_HAS_DCACHE
199 Single Cycle RAMS to store Fast Path Code
203 int "ICCM Size in KB"
205 depends on ARC_HAS_ICCM
210 Single Cycle RAMS to store Fast Path Data
214 int "DCCM Size in KB"
216 depends on ARC_HAS_DCCM
219 hex "DCCM map address"
221 depends on ARC_HAS_DCCM
223 config ARC_HAS_HW_MPY
224 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
227 Influences how gcc generates code for MPY operations.
228 If enabled, MPYxx insns are generated, provided by Standard/XMAC
229 Multipler. Otherwise software multipy lib is used
232 prompt "ARC700 MMU Version"
233 default ARC_MMU_V3 if ARC_CPU_770
234 default ARC_MMU_V2 if ARC_CPU_750D
244 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
245 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
249 depends on ARC_CPU_770
251 Introduced with ARC700 4.10: New Features
252 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
253 Shared Address Spaces (SASID)
259 prompt "MMU Page Size"
260 default ARC_PAGE_SIZE_8K
262 config ARC_PAGE_SIZE_8K
265 Choose between 8k vs 16k
267 config ARC_PAGE_SIZE_16K
269 depends on ARC_MMU_V3
271 config ARC_PAGE_SIZE_4K
273 depends on ARC_MMU_V3
277 config ARC_COMPACT_IRQ_LEVELS
278 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
280 # Timer HAS to be high priority, for any other high priority config
282 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
283 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
285 if ARC_COMPACT_IRQ_LEVELS
298 config ARC_FPU_SAVE_RESTORE
299 bool "Enable FPU state persistence across context switch"
302 Double Precision Floating Point unit had dedictaed regs which
303 need to be saved/restored across context-switch.
304 Note that ARC FPU is overly simplistic, unlike say x86, which has
305 hardware pieces to allow software to conditionally save/restore,
306 based on actual usage of FPU by a task. Thus our implemn does
307 this for all tasks in system.
312 menuconfig ARC_CPU_REL_4_10
313 bool "Enable support for Rel 4.10 features"
316 -ARC770 (and dependent features) enabled
317 -ARC750 also shares some of the new features with 770
320 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
322 depends on ARC_CPU_770 && !ARC_CANT_LLSC
325 bool "Insn: SWAPE (endian-swap)"
327 depends on ARC_CPU_REL_4_10
330 bool "Insn: RTSC (64-bit r/o cycle counter)"
332 depends on ARC_CPU_REL_4_10
335 endmenu # "ARC CPU Configuration"
337 config LINUX_LINK_BASE
338 hex "Linux Link Address"
341 ARC700 divides the 32 bit phy address space into two equal halves
342 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
343 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
344 Typically Linux kernel is linked at the start of untransalted addr,
345 hence the default value of 0x8zs.
346 However some customers have peripherals mapped at this addr, so
347 Linux needs to be scooted a bit.
348 If you don't know what the above means, leave this setting alone.
350 config ARC_CURR_IN_REG
351 bool "Dedicate Register r25 for current_task pointer"
354 This reserved Register R25 to point to Current Task in
355 kernel mode. This saves memory access for each such access
358 config ARC_MISALIGN_ACCESS
359 bool "Emulate unaligned memory access (userspace only)"
360 select SYSCTL_ARCH_UNALIGN_NO_WARN
361 select SYSCTL_ARCH_UNALIGN_ALLOW
363 This enables misaligned 16 & 32 bit memory access from user space.
364 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
365 potential bugs in code
368 int "Timer Frequency"
371 config ARC_METAWARE_HLINK
372 bool "Support for Metaware debugger assisted Host access"
375 This options allows a Linux userland apps to directly access
376 host file system (open/creat/read/write etc) with help from
377 Metaware Debugger. This can come in handy for Linux-host communication
378 when there is no real usable peripheral such as EMAC.
384 config ARC_DW2_UNWIND
385 bool "Enable DWARF specific kernel stack unwind"
390 Compiles the kernel with DWARF unwind information and can be used
391 to get stack backtraces.
393 If you say Y here the resulting kernel image will be slightly larger
394 but not slower, and it will give very useful debugging information.
395 If you don't debug the kernel, you can say N, but we may not be able
396 to solve problems without frame unwind information
398 config ARC_DBG_TLB_PARANOIA
399 bool "Paranoia Checks in Low Level TLB Handlers"
403 config ARC_DBG_TLB_MISS_COUNT
404 bool "Profile TLB Misses"
409 Counts number of I and D TLB Misses and exports them via Debugfs
410 The counters can be cleared via Debugfs as well
412 config ARC_BUILTIN_DTB_NAME
413 string "Built in DTB"
415 Set the name of the DTB to embed in the vmlinux binary
416 Leaving it blank selects the minimal "skeleton" dtb
418 source "kernel/Kconfig.preempt"
420 menu "Executable file formats"
421 source "fs/Kconfig.binfmt"
424 endmenu # "ARC Architecture Configuration"
428 source "drivers/Kconfig"
430 source "arch/arc/Kconfig.debug"
431 source "security/Kconfig"
432 source "crypto/Kconfig"