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 #New platform adds here
84 menu "ARC CPU Configuration"
93 Support for ARC750 core
97 select ARC_CPU_REL_4_10
99 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
100 This core has a bunch of cool new features:
101 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
102 Shared Address Spaces (for sharing TLB entires in MMU)
103 -Caches: New Prog Model, Region Flush
104 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
108 config CPU_BIG_ENDIAN
109 bool "Enable Big Endian Mode"
112 Build kernel for Big Endian Mode of ARC CPU
114 # If a platform can't work with 0x8000_0000 based dma_addr_t
115 config ARC_PLAT_NEEDS_CPU_TO_DMA
119 bool "Symmetric Multi-Processing (Incomplete)"
121 select USE_GENERIC_SMP_HELPERS
123 This enables support for systems with more than one CPU. If you have
124 a system with only one CPU, like most personal computers, say N. If
125 you have a system with more than one CPU, say Y.
129 config ARC_HAS_COH_CACHES
132 config ARC_HAS_COH_RTSC
135 config ARC_HAS_REENTRANT_IRQ_LV2
141 int "Maximum number of CPUs (2-32)"
147 bool "Enable Cache Support"
149 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
150 depends on !SMP || ARC_HAS_COH_CACHES
154 config ARC_CACHE_LINE_SHIFT
155 int "Cache Line Length (as power of 2)"
159 Starting with ARC700 4.9, Cache line length is configurable,
160 This option specifies "N", with Line-len = 2 power N
161 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
162 Linux only supports same line lengths for I and D caches.
164 config ARC_HAS_ICACHE
165 bool "Use Instruction Cache"
168 config ARC_HAS_DCACHE
169 bool "Use Data Cache"
172 config ARC_CACHE_PAGES
173 bool "Per Page Cache Control"
175 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
177 This can be used to over-ride the global I/D Cache Enable on a
178 per-page basis (but only for pages accessed via MMU such as
179 Kernel Virtual address or User Virtual Address)
180 TLB entries have a per-page Cache Enable Bit.
181 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
182 Global DISABLE + Per Page ENABLE won't work
189 Single Cycle RAMS to store Fast Path Code
193 int "ICCM Size in KB"
195 depends on ARC_HAS_ICCM
200 Single Cycle RAMS to store Fast Path Data
204 int "DCCM Size in KB"
206 depends on ARC_HAS_DCCM
209 hex "DCCM map address"
211 depends on ARC_HAS_DCCM
213 config ARC_HAS_HW_MPY
214 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
217 Influences how gcc generates code for MPY operations.
218 If enabled, MPYxx insns are generated, provided by Standard/XMAC
219 Multipler. Otherwise software multipy lib is used
222 prompt "ARC700 MMU Version"
223 default ARC_MMU_V3 if ARC_CPU_770
224 default ARC_MMU_V2 if ARC_CPU_750D
234 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
235 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
239 depends on ARC_CPU_770
241 Introduced with ARC700 4.10: New Features
242 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
243 Shared Address Spaces (SASID)
249 prompt "MMU Page Size"
250 default ARC_PAGE_SIZE_8K
252 config ARC_PAGE_SIZE_8K
255 Choose between 8k vs 16k
257 config ARC_PAGE_SIZE_16K
259 depends on ARC_MMU_V3
261 config ARC_PAGE_SIZE_4K
263 depends on ARC_MMU_V3
267 config ARC_COMPACT_IRQ_LEVELS
268 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
270 # Timer HAS to be high priority, for any other high priority config
272 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
273 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
275 if ARC_COMPACT_IRQ_LEVELS
288 config ARC_FPU_SAVE_RESTORE
289 bool "Enable FPU state persistence across context switch"
292 Double Precision Floating Point unit had dedictaed regs which
293 need to be saved/restored across context-switch.
294 Note that ARC FPU is overly simplistic, unlike say x86, which has
295 hardware pieces to allow software to conditionally save/restore,
296 based on actual usage of FPU by a task. Thus our implemn does
297 this for all tasks in system.
302 menuconfig ARC_CPU_REL_4_10
303 bool "Enable support for Rel 4.10 features"
306 -ARC770 (and dependent features) enabled
307 -ARC750 also shares some of the new features with 770
310 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
312 depends on ARC_CPU_770 && !ARC_CANT_LLSC
315 bool "Insn: SWAPE (endian-swap)"
317 depends on ARC_CPU_REL_4_10
320 bool "Insn: RTSC (64-bit r/o cycle counter)"
322 depends on ARC_CPU_REL_4_10
323 # if SMP, enable RTSC only if counter is coherent across cores
324 depends on !SMP || ARC_HAS_COH_RTSC
326 endmenu # "ARC CPU Configuration"
328 config LINUX_LINK_BASE
329 hex "Linux Link Address"
332 ARC700 divides the 32 bit phy address space into two equal halves
333 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
334 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
335 Typically Linux kernel is linked at the start of untransalted addr,
336 hence the default value of 0x8zs.
337 However some customers have peripherals mapped at this addr, so
338 Linux needs to be scooted a bit.
339 If you don't know what the above means, leave this setting alone.
341 config ARC_CURR_IN_REG
342 bool "Dedicate Register r25 for current_task pointer"
345 This reserved Register R25 to point to Current Task in
346 kernel mode. This saves memory access for each such access
349 config ARC_MISALIGN_ACCESS
350 bool "Emulate unaligned memory access (userspace only)"
352 select SYSCTL_ARCH_UNALIGN_NO_WARN
353 select SYSCTL_ARCH_UNALIGN_ALLOW
355 This enables misaligned 16 & 32 bit memory access from user space.
356 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
357 potential bugs in code
359 config ARC_STACK_NONEXEC
360 bool "Make stack non-executable"
363 To disable the execute permissions of stack/heap of processes
364 which are enabled by default.
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
412 string "Kernel command line to built-in"
413 default "print-fatal-signals=1"
415 The default command line which will be appended to the optional
416 u-boot provided command line (see below)
419 bool "Support U-boot kernel command line passing"
422 If you are using U-boot (www.denx.de) and wish to pass the kernel
423 command line from the U-boot environment to the Linux kernel then
424 switch this option on.
425 ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
426 to it. kernel startup code will copy the string into cmdline buffer
427 and also append CONFIG_CMDLINE.
429 config ARC_BUILTIN_DTB_NAME
430 string "Built in DTB"
432 Set the name of the DTB to embed in the vmlinux binary
433 Leaving it blank selects the minimal "skeleton" dtb
435 source "kernel/Kconfig.preempt"
437 menu "Executable file formats"
438 source "fs/Kconfig.binfmt"
441 endmenu # "ARC Architecture Configuration"
445 source "drivers/Kconfig"
447 source "arch/arc/Kconfig.debug"
448 source "security/Kconfig"
449 source "crypto/Kconfig"