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 CLONE_BACKWARDS
12 # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
13 select DEVTMPFS if !INITRAMFS_SOURCE=""
14 select GENERIC_ATOMIC64
15 select GENERIC_CLOCKEVENTS
16 select GENERIC_FIND_FIRST_BIT
17 # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
18 select GENERIC_IRQ_SHOW
19 select GENERIC_PENDING_IRQ if SMP
20 select GENERIC_SMP_IDLE_THREAD
22 select HAVE_ARCH_TRACEHOOK
23 select HAVE_GENERIC_HARDIRQS
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
38 config SCHED_OMIT_FRAME_POINTER
44 config RWSEM_GENERIC_SPINLOCK
47 config ARCH_FLATMEM_ENABLE
56 config GENERIC_CALIBRATE_DELAY
59 config GENERIC_HWEIGHT
62 config STACKTRACE_SUPPORT
66 config HAVE_LATENCYTOP_SUPPORT
73 source "kernel/Kconfig.freezer"
75 menu "ARC Architecture Configuration"
77 menu "ARC Platform/SoC/Board"
79 source "arch/arc/plat-arcfpga/Kconfig"
80 source "arch/arc/plat-tb10x/Kconfig"
81 #New platform adds here
85 menu "ARC CPU Configuration"
94 Support for ARC750 core
98 select ARC_CPU_REL_4_10
100 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
101 This core has a bunch of cool new features:
102 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
103 Shared Address Spaces (for sharing TLB entires in MMU)
104 -Caches: New Prog Model, Region Flush
105 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
109 config CPU_BIG_ENDIAN
110 bool "Enable Big Endian Mode"
113 Build kernel for Big Endian Mode of ARC CPU
115 # If a platform can't work with 0x8000_0000 based dma_addr_t
116 config ARC_PLAT_NEEDS_CPU_TO_DMA
120 bool "Symmetric Multi-Processing (Incomplete)"
122 select USE_GENERIC_SMP_HELPERS
124 This enables support for systems with more than one CPU. If you have
125 a system with only one CPU, like most personal computers, say N. If
126 you have a system with more than one CPU, say Y.
130 config ARC_HAS_COH_CACHES
133 config ARC_HAS_COH_RTSC
136 config ARC_HAS_REENTRANT_IRQ_LV2
142 int "Maximum number of CPUs (2-32)"
148 bool "Enable Cache Support"
150 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
151 depends on !SMP || ARC_HAS_COH_CACHES
155 config ARC_CACHE_LINE_SHIFT
156 int "Cache Line Length (as power of 2)"
160 Starting with ARC700 4.9, Cache line length is configurable,
161 This option specifies "N", with Line-len = 2 power N
162 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
163 Linux only supports same line lengths for I and D caches.
165 config ARC_HAS_ICACHE
166 bool "Use Instruction Cache"
169 config ARC_HAS_DCACHE
170 bool "Use Data Cache"
173 config ARC_CACHE_PAGES
174 bool "Per Page Cache Control"
176 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
178 This can be used to over-ride the global I/D Cache Enable on a
179 per-page basis (but only for pages accessed via MMU such as
180 Kernel Virtual address or User Virtual Address)
181 TLB entries have a per-page Cache Enable Bit.
182 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
183 Global DISABLE + Per Page ENABLE won't work
185 config ARC_CACHE_VIPT_ALIASING
186 bool "Support VIPT Aliasing D$"
194 Single Cycle RAMS to store Fast Path Code
198 int "ICCM Size in KB"
200 depends on ARC_HAS_ICCM
205 Single Cycle RAMS to store Fast Path Data
209 int "DCCM Size in KB"
211 depends on ARC_HAS_DCCM
214 hex "DCCM map address"
216 depends on ARC_HAS_DCCM
218 config ARC_HAS_HW_MPY
219 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
222 Influences how gcc generates code for MPY operations.
223 If enabled, MPYxx insns are generated, provided by Standard/XMAC
224 Multipler. Otherwise software multipy lib is used
227 prompt "ARC700 MMU Version"
228 default ARC_MMU_V3 if ARC_CPU_770
229 default ARC_MMU_V2 if ARC_CPU_750D
239 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
240 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
244 depends on ARC_CPU_770
246 Introduced with ARC700 4.10: New Features
247 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
248 Shared Address Spaces (SASID)
254 prompt "MMU Page Size"
255 default ARC_PAGE_SIZE_8K
257 config ARC_PAGE_SIZE_8K
260 Choose between 8k vs 16k
262 config ARC_PAGE_SIZE_16K
264 depends on ARC_MMU_V3
266 config ARC_PAGE_SIZE_4K
268 depends on ARC_MMU_V3
272 config ARC_COMPACT_IRQ_LEVELS
273 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
275 # Timer HAS to be high priority, for any other high priority config
277 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
278 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
280 if ARC_COMPACT_IRQ_LEVELS
293 config ARC_FPU_SAVE_RESTORE
294 bool "Enable FPU state persistence across context switch"
297 Double Precision Floating Point unit had dedictaed regs which
298 need to be saved/restored across context-switch.
299 Note that ARC FPU is overly simplistic, unlike say x86, which has
300 hardware pieces to allow software to conditionally save/restore,
301 based on actual usage of FPU by a task. Thus our implemn does
302 this for all tasks in system.
307 menuconfig ARC_CPU_REL_4_10
308 bool "Enable support for Rel 4.10 features"
311 -ARC770 (and dependent features) enabled
312 -ARC750 also shares some of the new features with 770
315 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
317 depends on ARC_CPU_770 && !ARC_CANT_LLSC
320 bool "Insn: SWAPE (endian-swap)"
322 depends on ARC_CPU_REL_4_10
325 bool "Insn: RTSC (64-bit r/o cycle counter)"
327 depends on ARC_CPU_REL_4_10
328 # if SMP, enable RTSC only if counter is coherent across cores
329 depends on !SMP || ARC_HAS_COH_RTSC
331 endmenu # "ARC CPU Configuration"
333 config LINUX_LINK_BASE
334 hex "Linux Link Address"
337 ARC700 divides the 32 bit phy address space into two equal halves
338 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
339 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
340 Typically Linux kernel is linked at the start of untransalted addr,
341 hence the default value of 0x8zs.
342 However some customers have peripherals mapped at this addr, so
343 Linux needs to be scooted a bit.
344 If you don't know what the above means, leave this setting alone.
346 config ARC_CURR_IN_REG
347 bool "Dedicate Register r25 for current_task pointer"
350 This reserved Register R25 to point to Current Task in
351 kernel mode. This saves memory access for each such access
354 config ARC_MISALIGN_ACCESS
355 bool "Emulate unaligned memory access (userspace only)"
357 select SYSCTL_ARCH_UNALIGN_NO_WARN
358 select SYSCTL_ARCH_UNALIGN_ALLOW
360 This enables misaligned 16 & 32 bit memory access from user space.
361 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
362 potential bugs in code
364 config ARC_STACK_NONEXEC
365 bool "Make stack non-executable"
368 To disable the execute permissions of stack/heap of processes
369 which are enabled by default.
372 int "Timer Frequency"
375 config ARC_METAWARE_HLINK
376 bool "Support for Metaware debugger assisted Host access"
379 This options allows a Linux userland apps to directly access
380 host file system (open/creat/read/write etc) with help from
381 Metaware Debugger. This can come in handy for Linux-host communication
382 when there is no real usable peripheral such as EMAC.
388 config ARC_DW2_UNWIND
389 bool "Enable DWARF specific kernel stack unwind"
394 Compiles the kernel with DWARF unwind information and can be used
395 to get stack backtraces.
397 If you say Y here the resulting kernel image will be slightly larger
398 but not slower, and it will give very useful debugging information.
399 If you don't debug the kernel, you can say N, but we may not be able
400 to solve problems without frame unwind information
402 config ARC_DBG_TLB_PARANOIA
403 bool "Paranoia Checks in Low Level TLB Handlers"
407 config ARC_DBG_TLB_MISS_COUNT
408 bool "Profile TLB Misses"
413 Counts number of I and D TLB Misses and exports them via Debugfs
414 The counters can be cleared via Debugfs as well
417 bool "Support U-boot kernel command line passing"
420 If you are using U-boot (www.denx.de) and wish to pass the kernel
421 command line from the U-boot environment to the Linux kernel then
422 switch this option on.
423 ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
424 to it. kernel startup code will append this to DeviceTree
425 /bootargs provided cmdline args.
427 config ARC_BUILTIN_DTB_NAME
428 string "Built in DTB"
430 Set the name of the DTB to embed in the vmlinux binary
431 Leaving it blank selects the minimal "skeleton" dtb
433 source "kernel/Kconfig.preempt"
435 menu "Executable file formats"
436 source "fs/Kconfig.binfmt"
439 endmenu # "ARC Architecture Configuration"
443 source "drivers/Kconfig"
445 source "arch/arc/Kconfig.debug"
446 source "security/Kconfig"
447 source "crypto/Kconfig"