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
25 select HAVE_ARCH_TRACEHOOK
26 select HAVE_GENERIC_HARDIRQS
28 select HAVE_KRETPROBES
30 select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
33 select MODULES_USE_ELF_RELA
36 select OF_EARLY_FLATTREE
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
65 config STACKTRACE_SUPPORT
69 config HAVE_LATENCYTOP_SUPPORT
76 source "kernel/Kconfig.freezer"
78 menu "ARC Architecture Configuration"
82 default ARC_PLAT_FPGA_LEGACY
84 config ARC_PLAT_FPGA_LEGACY
85 bool "\"Legacy\" ARC FPGA dev platform"
87 Support for ARC development platforms, provided by Synopsys.
88 These are based on FPGA or ISS. e.g.
93 #New platform adds here
96 menu "ARC CPU Configuration"
105 Support for ARC750 core
109 select ARC_CPU_REL_4_10
111 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
112 This core has a bunch of cool new features:
113 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
114 Shared Address Spaces (for sharing TLB entires in MMU)
115 -Caches: New Prog Model, Region Flush
116 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
120 config CPU_BIG_ENDIAN
121 bool "Enable Big Endian Mode"
124 Build kernel for Big Endian Mode of ARC CPU
127 bool "Symmetric Multi-Processing (Incomplete)"
129 select USE_GENERIC_SMP_HELPERS
131 This enables support for systems with more than one CPU. If you have
132 a system with only one CPU, like most personal computers, say N. If
133 you have a system with more than one CPU, say Y.
137 config ARC_HAS_COH_CACHES
140 config ARC_HAS_COH_LLSC
143 config ARC_HAS_COH_RTSC
146 config ARC_HAS_REENTRANT_IRQ_LV2
152 int "Maximum number of CPUs (2-32)"
158 bool "Enable Cache Support"
160 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
161 depends on !SMP || ARC_HAS_COH_CACHES
165 config ARC_CACHE_LINE_SHIFT
166 int "Cache Line Length (as power of 2)"
170 Starting with ARC700 4.9, Cache line length is configurable,
171 This option specifies "N", with Line-len = 2 power N
172 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
173 Linux only supports same line lengths for I and D caches.
175 config ARC_HAS_ICACHE
176 bool "Use Instruction Cache"
179 config ARC_HAS_DCACHE
180 bool "Use Data Cache"
183 config ARC_CACHE_PAGES
184 bool "Per Page Cache Control"
186 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
188 This can be used to over-ride the global I/D Cache Enable on a
189 per-page basis (but only for pages accessed via MMU such as
190 Kernel Virtual address or User Virtual Address)
191 TLB entries have a per-page Cache Enable Bit.
192 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
193 Global DISABLE + Per Page ENABLE won't work
197 config ARC_HAS_HW_MPY
198 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
201 Influences how gcc generates code for MPY operations.
202 If enabled, MPYxx insns are generated, provided by Standard/XMAC
203 Multipler. Otherwise software multipy lib is used
206 prompt "ARC700 MMU Version"
207 default ARC_MMU_V3 if ARC_CPU_770
208 default ARC_MMU_V2 if ARC_CPU_750D
218 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
219 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
223 depends on ARC_CPU_770
225 Introduced with ARC700 4.10: New Features
226 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
227 Shared Address Spaces (SASID)
233 prompt "MMU Page Size"
234 default ARC_PAGE_SIZE_8K
236 config ARC_PAGE_SIZE_8K
239 Choose between 8k vs 16k
241 config ARC_PAGE_SIZE_16K
243 depends on ARC_MMU_V3
245 config ARC_PAGE_SIZE_4K
247 depends on ARC_MMU_V3
251 config ARC_COMPACT_IRQ_LEVELS
252 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
254 # Timer HAS to be high priority, for any other high priority config
256 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
257 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
259 if ARC_COMPACT_IRQ_LEVELS
272 config ARC_FPU_SAVE_RESTORE
273 bool "Enable FPU state persistence across context switch"
276 Double Precision Floating Point unit had dedictaed regs which
277 need to be saved/restored across context-switch.
278 Note that ARC FPU is overly simplistic, unlike say x86, which has
279 hardware pieces to allow software to conditionally save/restore,
280 based on actual usage of FPU by a task. Thus our implemn does
281 this for all tasks in system.
283 menuconfig ARC_CPU_REL_4_10
284 bool "Enable support for Rel 4.10 features"
287 -ARC770 (and dependent features) enabled
288 -ARC750 also shares some of the new features with 770
291 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
293 depends on ARC_CPU_770
294 # if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
295 depends on !SMP || ARC_HAS_COH_LLSC
298 bool "Insn: SWAPE (endian-swap)"
300 depends on ARC_CPU_REL_4_10
303 bool "Insn: RTSC (64-bit r/o cycle counter)"
305 depends on ARC_CPU_REL_4_10
306 # if SMP, enable RTSC only if counter is coherent across cores
307 depends on !SMP || ARC_HAS_COH_RTSC
309 endmenu # "ARC CPU Configuration"
311 menu "Platform Board Configuration"
313 source "arch/arc/plat-arcfpga/Kconfig"
315 #New platform adds here
317 config LINUX_LINK_BASE
318 hex "Linux Link Address"
321 ARC700 divides the 32 bit phy address space into two equal halves
322 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
323 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
324 Typically Linux kernel is linked at the start of untransalted addr,
325 hence the default value of 0x8zs.
326 However some customers have peripherals mapped at this addr, so
327 Linux needs to be scooted a bit.
328 If you don't know what the above means, leave this setting alone.
330 endmenu # "Platform Board Configuration"
332 config ARC_CURR_IN_REG
333 bool "Dedicate Register r25 for current_task pointer"
336 This reserved Register R25 to point to Current Task in
337 kernel mode. This saves memory access for each such access
340 config ARC_MISALIGN_ACCESS
341 bool "Emulate unaligned memory access (userspace only)"
343 select SYSCTL_ARCH_UNALIGN_NO_WARN
344 select SYSCTL_ARCH_UNALIGN_ALLOW
346 This enables misaligned 16 & 32 bit memory access from user space.
347 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
348 potential bugs in code
350 config ARC_STACK_NONEXEC
351 bool "Make stack non-executable"
354 To disable the execute permissions of stack/heap of processes
355 which are enabled by default.
358 int "Timer Frequency"
365 config ARC_DW2_UNWIND
366 bool "Enable DWARF specific kernel stack unwind"
371 Compiles the kernel with DWARF unwind information and can be used
372 to get stack backtraces.
374 If you say Y here the resulting kernel image will be slightly larger
375 but not slower, and it will give very useful debugging information.
376 If you don't debug the kernel, you can say N, but we may not be able
377 to solve problems without frame unwind information
379 config ARC_DBG_TLB_PARANOIA
380 bool "Paranoia Checks in Low Level TLB Handlers"
381 depends on ARC_DBG && !SMP
384 config ARC_DBG_TLB_MISS_COUNT
385 bool "Profile TLB Misses"
390 Counts number of I and D TLB Misses and exports them via Debugfs
391 The counters can be cleared via Debugfs as well
394 string "Kernel command line to built-in"
395 default "print-fatal-signals=1"
397 The default command line which will be appended to the optional
398 u-boot provided command line (see below)
401 bool "Support U-boot kernel command line passing"
404 If you are using U-boot (www.denx.de) and wish to pass the kernel
405 command line from the U-boot environment to the Linux kernel then
406 switch this option on.
407 ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
408 to it. kernel startup code will copy the string into cmdline buffer
409 and also append CONFIG_CMDLINE.
411 config ARC_BUILTIN_DTB_NAME
412 string "Built in DTB"
414 Set the name of the DTB to embed in the vmlinux binary
415 Leaving it blank selects the minimal "skeleton" dtb
417 source "kernel/Kconfig.preempt"
419 endmenu # "ARC Architecture Configuration"
423 source "drivers/Kconfig"
425 source "arch/arc/Kconfig.debug"
426 source "security/Kconfig"
427 source "crypto/Kconfig"