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
29 select HAVE_KRETPROBES
31 select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
34 select MODULES_USE_ELF_RELA
37 select OF_EARLY_FLATTREE
39 config SCHED_OMIT_FRAME_POINTER
45 config RWSEM_GENERIC_SPINLOCK
48 config ARCH_FLATMEM_ENABLE
57 config GENERIC_CALIBRATE_DELAY
60 config GENERIC_HWEIGHT
66 config STACKTRACE_SUPPORT
70 config HAVE_LATENCYTOP_SUPPORT
77 source "kernel/Kconfig.freezer"
79 menu "ARC Architecture Configuration"
83 default ARC_PLAT_FPGA_LEGACY
85 config ARC_PLAT_FPGA_LEGACY
86 bool "\"Legacy\" ARC FPGA dev platform"
88 Support for ARC development platforms, provided by Synopsys.
89 These are based on FPGA or ISS. e.g.
94 #New platform adds here
97 menu "ARC CPU Configuration"
106 Support for ARC750 core
110 select ARC_CPU_REL_4_10
112 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
113 This core has a bunch of cool new features:
114 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
115 Shared Address Spaces (for sharing TLB entires in MMU)
116 -Caches: New Prog Model, Region Flush
117 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
121 config CPU_BIG_ENDIAN
122 bool "Enable Big Endian Mode"
125 Build kernel for Big Endian Mode of ARC CPU
128 bool "Symmetric Multi-Processing (Incomplete)"
130 select USE_GENERIC_SMP_HELPERS
132 This enables support for systems with more than one CPU. If you have
133 a system with only one CPU, like most personal computers, say N. If
134 you have a system with more than one CPU, say Y.
138 config ARC_HAS_COH_CACHES
141 config ARC_HAS_COH_LLSC
144 config ARC_HAS_COH_RTSC
147 config ARC_HAS_REENTRANT_IRQ_LV2
153 int "Maximum number of CPUs (2-32)"
159 bool "Enable Cache Support"
161 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
162 depends on !SMP || ARC_HAS_COH_CACHES
166 config ARC_CACHE_LINE_SHIFT
167 int "Cache Line Length (as power of 2)"
171 Starting with ARC700 4.9, Cache line length is configurable,
172 This option specifies "N", with Line-len = 2 power N
173 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
174 Linux only supports same line lengths for I and D caches.
176 config ARC_HAS_ICACHE
177 bool "Use Instruction Cache"
180 config ARC_HAS_DCACHE
181 bool "Use Data Cache"
184 config ARC_CACHE_PAGES
185 bool "Per Page Cache Control"
187 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
189 This can be used to over-ride the global I/D Cache Enable on a
190 per-page basis (but only for pages accessed via MMU such as
191 Kernel Virtual address or User Virtual Address)
192 TLB entries have a per-page Cache Enable Bit.
193 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
194 Global DISABLE + Per Page ENABLE won't work
198 config ARC_HAS_HW_MPY
199 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
202 Influences how gcc generates code for MPY operations.
203 If enabled, MPYxx insns are generated, provided by Standard/XMAC
204 Multipler. Otherwise software multipy lib is used
207 prompt "ARC700 MMU Version"
208 default ARC_MMU_V3 if ARC_CPU_770
209 default ARC_MMU_V2 if ARC_CPU_750D
219 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
220 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
224 depends on ARC_CPU_770
226 Introduced with ARC700 4.10: New Features
227 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
228 Shared Address Spaces (SASID)
234 prompt "MMU Page Size"
235 default ARC_PAGE_SIZE_8K
237 config ARC_PAGE_SIZE_8K
240 Choose between 8k vs 16k
242 config ARC_PAGE_SIZE_16K
244 depends on ARC_MMU_V3
246 config ARC_PAGE_SIZE_4K
248 depends on ARC_MMU_V3
252 config ARC_COMPACT_IRQ_LEVELS
253 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
255 # Timer HAS to be high priority, for any other high priority config
257 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
258 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
260 if ARC_COMPACT_IRQ_LEVELS
273 config ARC_FPU_SAVE_RESTORE
274 bool "Enable FPU state persistence across context switch"
277 Double Precision Floating Point unit had dedictaed regs which
278 need to be saved/restored across context-switch.
279 Note that ARC FPU is overly simplistic, unlike say x86, which has
280 hardware pieces to allow software to conditionally save/restore,
281 based on actual usage of FPU by a task. Thus our implemn does
282 this for all tasks in system.
284 menuconfig ARC_CPU_REL_4_10
285 bool "Enable support for Rel 4.10 features"
288 -ARC770 (and dependent features) enabled
289 -ARC750 also shares some of the new features with 770
292 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
294 depends on ARC_CPU_770
295 # if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
296 depends on !SMP || ARC_HAS_COH_LLSC
299 bool "Insn: SWAPE (endian-swap)"
301 depends on ARC_CPU_REL_4_10
304 bool "Insn: RTSC (64-bit r/o cycle counter)"
306 depends on ARC_CPU_REL_4_10
307 # if SMP, enable RTSC only if counter is coherent across cores
308 depends on !SMP || ARC_HAS_COH_RTSC
310 endmenu # "ARC CPU Configuration"
312 menu "Platform Board Configuration"
314 source "arch/arc/plat-arcfpga/Kconfig"
316 #New platform adds here
318 config LINUX_LINK_BASE
319 hex "Linux Link Address"
322 ARC700 divides the 32 bit phy address space into two equal halves
323 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
324 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
325 Typically Linux kernel is linked at the start of untransalted addr,
326 hence the default value of 0x8zs.
327 However some customers have peripherals mapped at this addr, so
328 Linux needs to be scooted a bit.
329 If you don't know what the above means, leave this setting alone.
331 endmenu # "Platform Board Configuration"
333 config ARC_CURR_IN_REG
334 bool "Dedicate Register r25 for current_task pointer"
337 This reserved Register R25 to point to Current Task in
338 kernel mode. This saves memory access for each such access
341 config ARC_MISALIGN_ACCESS
342 bool "Emulate unaligned memory access (userspace only)"
344 select SYSCTL_ARCH_UNALIGN_NO_WARN
345 select SYSCTL_ARCH_UNALIGN_ALLOW
347 This enables misaligned 16 & 32 bit memory access from user space.
348 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
349 potential bugs in code
351 config ARC_STACK_NONEXEC
352 bool "Make stack non-executable"
355 To disable the execute permissions of stack/heap of processes
356 which are enabled by default.
359 int "Timer Frequency"
366 config ARC_DW2_UNWIND
367 bool "Enable DWARF specific kernel stack unwind"
372 Compiles the kernel with DWARF unwind information and can be used
373 to get stack backtraces.
375 If you say Y here the resulting kernel image will be slightly larger
376 but not slower, and it will give very useful debugging information.
377 If you don't debug the kernel, you can say N, but we may not be able
378 to solve problems without frame unwind information
380 config ARC_DBG_TLB_PARANOIA
381 bool "Paranoia Checks in Low Level TLB Handlers"
385 config ARC_DBG_TLB_MISS_COUNT
386 bool "Profile TLB Misses"
391 Counts number of I and D TLB Misses and exports them via Debugfs
392 The counters can be cleared via Debugfs as well
395 string "Kernel command line to built-in"
396 default "print-fatal-signals=1"
398 The default command line which will be appended to the optional
399 u-boot provided command line (see below)
402 bool "Support U-boot kernel command line passing"
405 If you are using U-boot (www.denx.de) and wish to pass the kernel
406 command line from the U-boot environment to the Linux kernel then
407 switch this option on.
408 ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
409 to it. kernel startup code will copy the string into cmdline buffer
410 and also append CONFIG_CMDLINE.
412 config ARC_BUILTIN_DTB_NAME
413 string "Built in DTB"
415 Set the name of the DTB to embed in the vmlinux binary
416 Leaving it blank selects the minimal "skeleton" dtb
418 source "kernel/Kconfig.preempt"
420 endmenu # "ARC Architecture Configuration"
424 source "drivers/Kconfig"
426 source "arch/arc/Kconfig.debug"
427 source "security/Kconfig"
428 source "crypto/Kconfig"