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 ARCH_NO_VIRT_TO_BUS
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_KERNEL_EXECVE
21 select GENERIC_KERNEL_THREAD
22 select GENERIC_PENDING_IRQ if SMP
23 select GENERIC_SIGALTSTACK
24 select GENERIC_SMP_IDLE_THREAD
26 select HAVE_ARCH_TRACEHOOK
27 select HAVE_GENERIC_HARDIRQS
28 select HAVE_IOREMAP_PROT
31 select HAVE_KRETPROBES
33 select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
35 select HAVE_PERF_EVENTS
37 select MODULES_USE_ELF_RELA
40 select OF_EARLY_FLATTREE
41 select PERF_USE_VMALLOC
43 config SCHED_OMIT_FRAME_POINTER
49 config RWSEM_GENERIC_SPINLOCK
52 config ARCH_FLATMEM_ENABLE
61 config GENERIC_CALIBRATE_DELAY
64 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"
87 config ARC_PLAT_FPGA_LEGACY
88 bool "\"Legacy\" ARC FPGA dev platform"
90 Support for ARC development platforms, provided by Synopsys.
91 These are based on FPGA or ISS. e.g.
96 #New platform adds here
99 menu "ARC CPU Configuration"
108 Support for ARC750 core
112 select ARC_CPU_REL_4_10
114 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
115 This core has a bunch of cool new features:
116 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
117 Shared Address Spaces (for sharing TLB entires in MMU)
118 -Caches: New Prog Model, Region Flush
119 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
123 config CPU_BIG_ENDIAN
124 bool "Enable Big Endian Mode"
127 Build kernel for Big Endian Mode of ARC CPU
130 bool "Symmetric Multi-Processing (Incomplete)"
132 select USE_GENERIC_SMP_HELPERS
134 This enables support for systems with more than one CPU. If you have
135 a system with only one CPU, like most personal computers, say N. If
136 you have a system with more than one CPU, say Y.
140 config ARC_HAS_COH_CACHES
143 config ARC_HAS_COH_LLSC
146 config ARC_HAS_COH_RTSC
149 config ARC_HAS_REENTRANT_IRQ_LV2
155 int "Maximum number of CPUs (2-32)"
161 bool "Enable Cache Support"
163 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
164 depends on !SMP || ARC_HAS_COH_CACHES
168 config ARC_CACHE_LINE_SHIFT
169 int "Cache Line Length (as power of 2)"
173 Starting with ARC700 4.9, Cache line length is configurable,
174 This option specifies "N", with Line-len = 2 power N
175 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
176 Linux only supports same line lengths for I and D caches.
178 config ARC_HAS_ICACHE
179 bool "Use Instruction Cache"
182 config ARC_HAS_DCACHE
183 bool "Use Data Cache"
186 config ARC_CACHE_PAGES
187 bool "Per Page Cache Control"
189 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
191 This can be used to over-ride the global I/D Cache Enable on a
192 per-page basis (but only for pages accessed via MMU such as
193 Kernel Virtual address or User Virtual Address)
194 TLB entries have a per-page Cache Enable Bit.
195 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
196 Global DISABLE + Per Page ENABLE won't work
203 Single Cycle RAMS to store Fast Path Code
207 int "ICCM Size in KB"
209 depends on ARC_HAS_ICCM
214 Single Cycle RAMS to store Fast Path Data
218 int "DCCM Size in KB"
220 depends on ARC_HAS_DCCM
223 hex "DCCM map address"
225 depends on ARC_HAS_DCCM
227 config ARC_HAS_HW_MPY
228 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
231 Influences how gcc generates code for MPY operations.
232 If enabled, MPYxx insns are generated, provided by Standard/XMAC
233 Multipler. Otherwise software multipy lib is used
236 prompt "ARC700 MMU Version"
237 default ARC_MMU_V3 if ARC_CPU_770
238 default ARC_MMU_V2 if ARC_CPU_750D
248 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
249 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
253 depends on ARC_CPU_770
255 Introduced with ARC700 4.10: New Features
256 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
257 Shared Address Spaces (SASID)
263 prompt "MMU Page Size"
264 default ARC_PAGE_SIZE_8K
266 config ARC_PAGE_SIZE_8K
269 Choose between 8k vs 16k
271 config ARC_PAGE_SIZE_16K
273 depends on ARC_MMU_V3
275 config ARC_PAGE_SIZE_4K
277 depends on ARC_MMU_V3
281 config ARC_COMPACT_IRQ_LEVELS
282 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
284 # Timer HAS to be high priority, for any other high priority config
286 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
287 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
289 if ARC_COMPACT_IRQ_LEVELS
302 config ARC_FPU_SAVE_RESTORE
303 bool "Enable FPU state persistence across context switch"
306 Double Precision Floating Point unit had dedictaed regs which
307 need to be saved/restored across context-switch.
308 Note that ARC FPU is overly simplistic, unlike say x86, which has
309 hardware pieces to allow software to conditionally save/restore,
310 based on actual usage of FPU by a task. Thus our implemn does
311 this for all tasks in system.
313 menuconfig ARC_CPU_REL_4_10
314 bool "Enable support for Rel 4.10 features"
317 -ARC770 (and dependent features) enabled
318 -ARC750 also shares some of the new features with 770
321 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
323 depends on ARC_CPU_770
324 # if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
325 depends on !SMP || ARC_HAS_COH_LLSC
328 bool "Insn: SWAPE (endian-swap)"
330 depends on ARC_CPU_REL_4_10
333 bool "Insn: RTSC (64-bit r/o cycle counter)"
335 depends on ARC_CPU_REL_4_10
336 # if SMP, enable RTSC only if counter is coherent across cores
337 depends on !SMP || ARC_HAS_COH_RTSC
339 endmenu # "ARC CPU Configuration"
341 menu "Platform Board Configuration"
343 source "arch/arc/plat-arcfpga/Kconfig"
345 #New platform adds here
347 config LINUX_LINK_BASE
348 hex "Linux Link Address"
351 ARC700 divides the 32 bit phy address space into two equal halves
352 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
353 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
354 Typically Linux kernel is linked at the start of untransalted addr,
355 hence the default value of 0x8zs.
356 However some customers have peripherals mapped at this addr, so
357 Linux needs to be scooted a bit.
358 If you don't know what the above means, leave this setting alone.
360 endmenu # "Platform Board Configuration"
362 config ARC_CURR_IN_REG
363 bool "Dedicate Register r25 for current_task pointer"
366 This reserved Register R25 to point to Current Task in
367 kernel mode. This saves memory access for each such access
370 config ARC_MISALIGN_ACCESS
371 bool "Emulate unaligned memory access (userspace only)"
373 select SYSCTL_ARCH_UNALIGN_NO_WARN
374 select SYSCTL_ARCH_UNALIGN_ALLOW
376 This enables misaligned 16 & 32 bit memory access from user space.
377 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
378 potential bugs in code
380 config ARC_STACK_NONEXEC
381 bool "Make stack non-executable"
384 To disable the execute permissions of stack/heap of processes
385 which are enabled by default.
388 int "Timer Frequency"
391 config ARC_METAWARE_HLINK
392 bool "Support for Metaware debugger assisted Host access"
395 This options allows a Linux userland apps to directly access
396 host file system (open/creat/read/write etc) with help from
397 Metaware Debugger. This can come in handy for Linux-host communication
398 when there is no real usable peripheral such as EMAC.
404 config ARC_DW2_UNWIND
405 bool "Enable DWARF specific kernel stack unwind"
410 Compiles the kernel with DWARF unwind information and can be used
411 to get stack backtraces.
413 If you say Y here the resulting kernel image will be slightly larger
414 but not slower, and it will give very useful debugging information.
415 If you don't debug the kernel, you can say N, but we may not be able
416 to solve problems without frame unwind information
418 config ARC_DBG_TLB_PARANOIA
419 bool "Paranoia Checks in Low Level TLB Handlers"
423 config ARC_DBG_TLB_MISS_COUNT
424 bool "Profile TLB Misses"
429 Counts number of I and D TLB Misses and exports them via Debugfs
430 The counters can be cleared via Debugfs as well
433 string "Kernel command line to built-in"
434 default "print-fatal-signals=1"
436 The default command line which will be appended to the optional
437 u-boot provided command line (see below)
440 bool "Support U-boot kernel command line passing"
443 If you are using U-boot (www.denx.de) and wish to pass the kernel
444 command line from the U-boot environment to the Linux kernel then
445 switch this option on.
446 ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
447 to it. kernel startup code will copy the string into cmdline buffer
448 and also append CONFIG_CMDLINE.
450 config ARC_BUILTIN_DTB_NAME
451 string "Built in DTB"
453 Set the name of the DTB to embed in the vmlinux binary
454 Leaving it blank selects the minimal "skeleton" dtb
456 source "kernel/Kconfig.preempt"
458 endmenu # "ARC Architecture Configuration"
462 source "drivers/Kconfig"
464 source "arch/arc/Kconfig.debug"
465 source "security/Kconfig"
466 source "crypto/Kconfig"