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
12 select CLONE_BACKWARDS
13 # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
14 select DEVTMPFS if !INITRAMFS_SOURCE=""
15 select GENERIC_ATOMIC64
16 select GENERIC_CLOCKEVENTS
17 select GENERIC_FIND_FIRST_BIT
18 # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
19 select GENERIC_IRQ_SHOW
20 select GENERIC_PENDING_IRQ if SMP
21 select GENERIC_SMP_IDLE_THREAD
23 select HAVE_ARCH_TRACEHOOK
24 select HAVE_IOREMAP_PROT
26 select HAVE_KRETPROBES
28 select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
30 select HAVE_PERF_EVENTS
32 select MODULES_USE_ELF_RELA
35 select OF_EARLY_FLATTREE
36 select PERF_USE_VMALLOC
37 select HAVE_DEBUG_STACKOVERFLOW
39 config TRACE_IRQFLAGS_SUPPORT
42 config LOCKDEP_SUPPORT
45 config SCHED_OMIT_FRAME_POINTER
51 config RWSEM_GENERIC_SPINLOCK
54 config ARCH_FLATMEM_ENABLE
63 config GENERIC_CALIBRATE_DELAY
66 config GENERIC_HWEIGHT
69 config STACKTRACE_SUPPORT
73 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-arcfpga/Kconfig"
87 source "arch/arc/plat-tb10x/Kconfig"
88 #New platform adds here
92 menu "ARC CPU Configuration"
101 Support for ARC750 core
105 select ARC_CPU_REL_4_10
107 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
108 This core has a bunch of cool new features:
109 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
110 Shared Address Spaces (for sharing TLB entires in MMU)
111 -Caches: New Prog Model, Region Flush
112 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
116 config CPU_BIG_ENDIAN
117 bool "Enable Big Endian Mode"
120 Build kernel for Big Endian Mode of ARC CPU
122 # If a platform can't work with 0x8000_0000 based dma_addr_t
123 config ARC_PLAT_NEEDS_CPU_TO_DMA
127 bool "Symmetric Multi-Processing (Incomplete)"
130 This enables support for systems with more than one CPU. If you have
131 a system with only one CPU, say N. If you have a system with more
136 config ARC_HAS_COH_CACHES
139 config ARC_HAS_REENTRANT_IRQ_LV2
145 int "Maximum number of CPUs (2-4096)"
151 bool "Enable Cache Support"
153 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
154 depends on !SMP || ARC_HAS_COH_CACHES
158 config ARC_CACHE_LINE_SHIFT
159 int "Cache Line Length (as power of 2)"
163 Starting with ARC700 4.9, Cache line length is configurable,
164 This option specifies "N", with Line-len = 2 power N
165 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
166 Linux only supports same line lengths for I and D caches.
168 config ARC_HAS_ICACHE
169 bool "Use Instruction Cache"
172 config ARC_HAS_DCACHE
173 bool "Use Data Cache"
176 config ARC_CACHE_PAGES
177 bool "Per Page Cache Control"
179 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
181 This can be used to over-ride the global I/D Cache Enable on a
182 per-page basis (but only for pages accessed via MMU such as
183 Kernel Virtual address or User Virtual Address)
184 TLB entries have a per-page Cache Enable Bit.
185 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
186 Global DISABLE + Per Page ENABLE won't work
188 config ARC_CACHE_VIPT_ALIASING
189 bool "Support VIPT Aliasing D$"
190 depends on ARC_HAS_DCACHE
198 Single Cycle RAMS to store Fast Path Code
202 int "ICCM Size in KB"
204 depends on ARC_HAS_ICCM
209 Single Cycle RAMS to store Fast Path Data
213 int "DCCM Size in KB"
215 depends on ARC_HAS_DCCM
218 hex "DCCM map address"
220 depends on ARC_HAS_DCCM
222 config ARC_HAS_HW_MPY
223 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
226 Influences how gcc generates code for MPY operations.
227 If enabled, MPYxx insns are generated, provided by Standard/XMAC
228 Multipler. Otherwise software multipy lib is used
231 prompt "ARC700 MMU Version"
232 default ARC_MMU_V3 if ARC_CPU_770
233 default ARC_MMU_V2 if ARC_CPU_750D
243 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
244 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
248 depends on ARC_CPU_770
250 Introduced with ARC700 4.10: New Features
251 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
252 Shared Address Spaces (SASID)
258 prompt "MMU Page Size"
259 default ARC_PAGE_SIZE_8K
261 config ARC_PAGE_SIZE_8K
264 Choose between 8k vs 16k
266 config ARC_PAGE_SIZE_16K
268 depends on ARC_MMU_V3
270 config ARC_PAGE_SIZE_4K
272 depends on ARC_MMU_V3
276 config ARC_COMPACT_IRQ_LEVELS
277 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
279 # Timer HAS to be high priority, for any other high priority config
281 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
282 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
284 if ARC_COMPACT_IRQ_LEVELS
297 config ARC_FPU_SAVE_RESTORE
298 bool "Enable FPU state persistence across context switch"
301 Double Precision Floating Point unit had dedictaed regs which
302 need to be saved/restored across context-switch.
303 Note that ARC FPU is overly simplistic, unlike say x86, which has
304 hardware pieces to allow software to conditionally save/restore,
305 based on actual usage of FPU by a task. Thus our implemn does
306 this for all tasks in system.
311 menuconfig ARC_CPU_REL_4_10
312 bool "Enable support for Rel 4.10 features"
315 -ARC770 (and dependent features) enabled
316 -ARC750 also shares some of the new features with 770
319 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
321 depends on ARC_CPU_770 && !ARC_CANT_LLSC
324 bool "Insn: SWAPE (endian-swap)"
326 depends on ARC_CPU_REL_4_10
329 bool "Insn: RTSC (64-bit r/o cycle counter)"
331 depends on ARC_CPU_REL_4_10
334 endmenu # "ARC CPU Configuration"
336 config LINUX_LINK_BASE
337 hex "Linux Link Address"
340 ARC700 divides the 32 bit phy address space into two equal halves
341 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
342 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
343 Typically Linux kernel is linked at the start of untransalted addr,
344 hence the default value of 0x8zs.
345 However some customers have peripherals mapped at this addr, so
346 Linux needs to be scooted a bit.
347 If you don't know what the above means, leave this setting alone.
349 config ARC_CURR_IN_REG
350 bool "Dedicate Register r25 for current_task pointer"
353 This reserved Register R25 to point to Current Task in
354 kernel mode. This saves memory access for each such access
357 config ARC_MISALIGN_ACCESS
358 bool "Emulate unaligned memory access (userspace only)"
359 select SYSCTL_ARCH_UNALIGN_NO_WARN
360 select SYSCTL_ARCH_UNALIGN_ALLOW
362 This enables misaligned 16 & 32 bit memory access from user space.
363 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
364 potential bugs in code
367 int "Timer Frequency"
370 config ARC_METAWARE_HLINK
371 bool "Support for Metaware debugger assisted Host access"
374 This options allows a Linux userland apps to directly access
375 host file system (open/creat/read/write etc) with help from
376 Metaware Debugger. This can come in handy for Linux-host communication
377 when there is no real usable peripheral such as EMAC.
383 config ARC_DW2_UNWIND
384 bool "Enable DWARF specific kernel stack unwind"
389 Compiles the kernel with DWARF unwind information and can be used
390 to get stack backtraces.
392 If you say Y here the resulting kernel image will be slightly larger
393 but not slower, and it will give very useful debugging information.
394 If you don't debug the kernel, you can say N, but we may not be able
395 to solve problems without frame unwind information
397 config ARC_DBG_TLB_PARANOIA
398 bool "Paranoia Checks in Low Level TLB Handlers"
402 config ARC_DBG_TLB_MISS_COUNT
403 bool "Profile TLB Misses"
408 Counts number of I and D TLB Misses and exports them via Debugfs
409 The counters can be cleared via Debugfs as well
411 config ARC_BUILTIN_DTB_NAME
412 string "Built in DTB"
414 Set the name of the DTB to embed in the vmlinux binary
415 Leaving it blank selects the minimal "skeleton" dtb
417 source "kernel/Kconfig.preempt"
419 menu "Executable file formats"
420 source "fs/Kconfig.binfmt"
423 endmenu # "ARC Architecture Configuration"
427 source "drivers/Kconfig"
429 source "arch/arc/Kconfig.debug"
430 source "security/Kconfig"
431 source "crypto/Kconfig"