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 select GENERIC_IDLE_LOOP
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_SMP_IDLE_THREAD
25 select HAVE_ARCH_TRACEHOOK
26 select HAVE_GENERIC_HARDIRQS
27 select HAVE_IOREMAP_PROT
29 select HAVE_KRETPROBES
31 select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
33 select HAVE_PERF_EVENTS
35 select MODULES_USE_ELF_RELA
38 select OF_EARLY_FLATTREE
39 select PERF_USE_VMALLOC
41 config SCHED_OMIT_FRAME_POINTER
47 config RWSEM_GENERIC_SPINLOCK
50 config ARCH_FLATMEM_ENABLE
59 config GENERIC_CALIBRATE_DELAY
62 config GENERIC_HWEIGHT
68 config STACKTRACE_SUPPORT
72 config HAVE_LATENCYTOP_SUPPORT
79 source "kernel/Kconfig.freezer"
81 menu "ARC Architecture Configuration"
83 menu "ARC Platform/SoC/Board"
85 source "arch/arc/plat-arcfpga/Kconfig"
86 #New platform adds here
90 menu "ARC CPU Configuration"
99 Support for ARC750 core
103 select ARC_CPU_REL_4_10
105 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
106 This core has a bunch of cool new features:
107 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
108 Shared Address Spaces (for sharing TLB entires in MMU)
109 -Caches: New Prog Model, Region Flush
110 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
114 config CPU_BIG_ENDIAN
115 bool "Enable Big Endian Mode"
118 Build kernel for Big Endian Mode of ARC CPU
120 # If a platform can't work with 0x8000_0000 based dma_addr_t
121 config ARC_PLAT_NEEDS_CPU_TO_DMA
125 bool "Symmetric Multi-Processing (Incomplete)"
127 select USE_GENERIC_SMP_HELPERS
129 This enables support for systems with more than one CPU. If you have
130 a system with only one CPU, like most personal computers, say N. If
131 you have a system with more than one CPU, say Y.
135 config ARC_HAS_COH_CACHES
138 config ARC_HAS_COH_LLSC
141 config ARC_HAS_COH_RTSC
144 config ARC_HAS_REENTRANT_IRQ_LV2
150 int "Maximum number of CPUs (2-32)"
156 bool "Enable Cache Support"
158 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
159 depends on !SMP || ARC_HAS_COH_CACHES
163 config ARC_CACHE_LINE_SHIFT
164 int "Cache Line Length (as power of 2)"
168 Starting with ARC700 4.9, Cache line length is configurable,
169 This option specifies "N", with Line-len = 2 power N
170 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
171 Linux only supports same line lengths for I and D caches.
173 config ARC_HAS_ICACHE
174 bool "Use Instruction Cache"
177 config ARC_HAS_DCACHE
178 bool "Use Data Cache"
181 config ARC_CACHE_PAGES
182 bool "Per Page Cache Control"
184 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
186 This can be used to over-ride the global I/D Cache Enable on a
187 per-page basis (but only for pages accessed via MMU such as
188 Kernel Virtual address or User Virtual Address)
189 TLB entries have a per-page Cache Enable Bit.
190 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
191 Global DISABLE + Per Page ENABLE won't work
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.
308 menuconfig ARC_CPU_REL_4_10
309 bool "Enable support for Rel 4.10 features"
312 -ARC770 (and dependent features) enabled
313 -ARC750 also shares some of the new features with 770
316 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
318 depends on ARC_CPU_770
319 # if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
320 depends on !SMP || ARC_HAS_COH_LLSC
323 bool "Insn: SWAPE (endian-swap)"
325 depends on ARC_CPU_REL_4_10
328 bool "Insn: RTSC (64-bit r/o cycle counter)"
330 depends on ARC_CPU_REL_4_10
331 # if SMP, enable RTSC only if counter is coherent across cores
332 depends on !SMP || ARC_HAS_COH_RTSC
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)"
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
367 config ARC_STACK_NONEXEC
368 bool "Make stack non-executable"
371 To disable the execute permissions of stack/heap of processes
372 which are enabled by default.
375 int "Timer Frequency"
378 config ARC_METAWARE_HLINK
379 bool "Support for Metaware debugger assisted Host access"
382 This options allows a Linux userland apps to directly access
383 host file system (open/creat/read/write etc) with help from
384 Metaware Debugger. This can come in handy for Linux-host communication
385 when there is no real usable peripheral such as EMAC.
391 config ARC_DW2_UNWIND
392 bool "Enable DWARF specific kernel stack unwind"
397 Compiles the kernel with DWARF unwind information and can be used
398 to get stack backtraces.
400 If you say Y here the resulting kernel image will be slightly larger
401 but not slower, and it will give very useful debugging information.
402 If you don't debug the kernel, you can say N, but we may not be able
403 to solve problems without frame unwind information
405 config ARC_DBG_TLB_PARANOIA
406 bool "Paranoia Checks in Low Level TLB Handlers"
410 config ARC_DBG_TLB_MISS_COUNT
411 bool "Profile TLB Misses"
416 Counts number of I and D TLB Misses and exports them via Debugfs
417 The counters can be cleared via Debugfs as well
420 string "Kernel command line to built-in"
421 default "print-fatal-signals=1"
423 The default command line which will be appended to the optional
424 u-boot provided command line (see below)
427 bool "Support U-boot kernel command line passing"
430 If you are using U-boot (www.denx.de) and wish to pass the kernel
431 command line from the U-boot environment to the Linux kernel then
432 switch this option on.
433 ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
434 to it. kernel startup code will copy the string into cmdline buffer
435 and also append CONFIG_CMDLINE.
437 config ARC_BUILTIN_DTB_NAME
438 string "Built in DTB"
440 Set the name of the DTB to embed in the vmlinux binary
441 Leaving it blank selects the minimal "skeleton" dtb
443 source "kernel/Kconfig.preempt"
445 endmenu # "ARC Architecture Configuration"
449 source "drivers/Kconfig"
451 source "arch/arc/Kconfig.debug"
452 source "security/Kconfig"
453 source "crypto/Kconfig"