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
30 select HAVE_KRETPROBES
32 select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
34 select HAVE_PERF_EVENTS
36 select MODULES_USE_ELF_RELA
39 select OF_EARLY_FLATTREE
40 select PERF_USE_VMALLOC
42 config SCHED_OMIT_FRAME_POINTER
48 config RWSEM_GENERIC_SPINLOCK
51 config ARCH_FLATMEM_ENABLE
60 config GENERIC_CALIBRATE_DELAY
63 config GENERIC_HWEIGHT
69 config STACKTRACE_SUPPORT
73 config HAVE_LATENCYTOP_SUPPORT
80 source "kernel/Kconfig.freezer"
82 menu "ARC Architecture Configuration"
86 default ARC_PLAT_FPGA_LEGACY
88 config ARC_PLAT_FPGA_LEGACY
89 bool "\"Legacy\" ARC FPGA dev platform"
91 Support for ARC development platforms, provided by Synopsys.
92 These are based on FPGA or ISS. e.g.
97 #New platform adds here
100 menu "ARC CPU Configuration"
109 Support for ARC750 core
113 select ARC_CPU_REL_4_10
115 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
116 This core has a bunch of cool new features:
117 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
118 Shared Address Spaces (for sharing TLB entires in MMU)
119 -Caches: New Prog Model, Region Flush
120 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
124 config CPU_BIG_ENDIAN
125 bool "Enable Big Endian Mode"
128 Build kernel for Big Endian Mode of ARC CPU
131 bool "Symmetric Multi-Processing (Incomplete)"
133 select USE_GENERIC_SMP_HELPERS
135 This enables support for systems with more than one CPU. If you have
136 a system with only one CPU, like most personal computers, say N. If
137 you have a system with more than one CPU, say Y.
141 config ARC_HAS_COH_CACHES
144 config ARC_HAS_COH_LLSC
147 config ARC_HAS_COH_RTSC
150 config ARC_HAS_REENTRANT_IRQ_LV2
156 int "Maximum number of CPUs (2-32)"
162 bool "Enable Cache Support"
164 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
165 depends on !SMP || ARC_HAS_COH_CACHES
169 config ARC_CACHE_LINE_SHIFT
170 int "Cache Line Length (as power of 2)"
174 Starting with ARC700 4.9, Cache line length is configurable,
175 This option specifies "N", with Line-len = 2 power N
176 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
177 Linux only supports same line lengths for I and D caches.
179 config ARC_HAS_ICACHE
180 bool "Use Instruction Cache"
183 config ARC_HAS_DCACHE
184 bool "Use Data Cache"
187 config ARC_CACHE_PAGES
188 bool "Per Page Cache Control"
190 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
192 This can be used to over-ride the global I/D Cache Enable on a
193 per-page basis (but only for pages accessed via MMU such as
194 Kernel Virtual address or User Virtual Address)
195 TLB entries have a per-page Cache Enable Bit.
196 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
197 Global DISABLE + Per Page ENABLE won't work
204 Single Cycle RAMS to store Fast Path Code
208 int "ICCM Size in KB"
210 depends on ARC_HAS_ICCM
215 Single Cycle RAMS to store Fast Path Data
219 int "DCCM Size in KB"
221 depends on ARC_HAS_DCCM
224 hex "DCCM map address"
226 depends on ARC_HAS_DCCM
228 config ARC_HAS_HW_MPY
229 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
232 Influences how gcc generates code for MPY operations.
233 If enabled, MPYxx insns are generated, provided by Standard/XMAC
234 Multipler. Otherwise software multipy lib is used
237 prompt "ARC700 MMU Version"
238 default ARC_MMU_V3 if ARC_CPU_770
239 default ARC_MMU_V2 if ARC_CPU_750D
249 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
250 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
254 depends on ARC_CPU_770
256 Introduced with ARC700 4.10: New Features
257 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
258 Shared Address Spaces (SASID)
264 prompt "MMU Page Size"
265 default ARC_PAGE_SIZE_8K
267 config ARC_PAGE_SIZE_8K
270 Choose between 8k vs 16k
272 config ARC_PAGE_SIZE_16K
274 depends on ARC_MMU_V3
276 config ARC_PAGE_SIZE_4K
278 depends on ARC_MMU_V3
282 config ARC_COMPACT_IRQ_LEVELS
283 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
285 # Timer HAS to be high priority, for any other high priority config
287 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
288 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
290 if ARC_COMPACT_IRQ_LEVELS
303 config ARC_FPU_SAVE_RESTORE
304 bool "Enable FPU state persistence across context switch"
307 Double Precision Floating Point unit had dedictaed regs which
308 need to be saved/restored across context-switch.
309 Note that ARC FPU is overly simplistic, unlike say x86, which has
310 hardware pieces to allow software to conditionally save/restore,
311 based on actual usage of FPU by a task. Thus our implemn does
312 this for all tasks in system.
314 menuconfig ARC_CPU_REL_4_10
315 bool "Enable support for Rel 4.10 features"
318 -ARC770 (and dependent features) enabled
319 -ARC750 also shares some of the new features with 770
322 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
324 depends on ARC_CPU_770
325 # if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
326 depends on !SMP || ARC_HAS_COH_LLSC
329 bool "Insn: SWAPE (endian-swap)"
331 depends on ARC_CPU_REL_4_10
334 bool "Insn: RTSC (64-bit r/o cycle counter)"
336 depends on ARC_CPU_REL_4_10
337 # if SMP, enable RTSC only if counter is coherent across cores
338 depends on !SMP || ARC_HAS_COH_RTSC
340 endmenu # "ARC CPU Configuration"
342 menu "Platform Board Configuration"
344 source "arch/arc/plat-arcfpga/Kconfig"
346 #New platform adds here
348 config LINUX_LINK_BASE
349 hex "Linux Link Address"
352 ARC700 divides the 32 bit phy address space into two equal halves
353 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
354 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
355 Typically Linux kernel is linked at the start of untransalted addr,
356 hence the default value of 0x8zs.
357 However some customers have peripherals mapped at this addr, so
358 Linux needs to be scooted a bit.
359 If you don't know what the above means, leave this setting alone.
361 endmenu # "Platform Board Configuration"
363 config ARC_CURR_IN_REG
364 bool "Dedicate Register r25 for current_task pointer"
367 This reserved Register R25 to point to Current Task in
368 kernel mode. This saves memory access for each such access
371 config ARC_MISALIGN_ACCESS
372 bool "Emulate unaligned memory access (userspace only)"
374 select SYSCTL_ARCH_UNALIGN_NO_WARN
375 select SYSCTL_ARCH_UNALIGN_ALLOW
377 This enables misaligned 16 & 32 bit memory access from user space.
378 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
379 potential bugs in code
381 config ARC_STACK_NONEXEC
382 bool "Make stack non-executable"
385 To disable the execute permissions of stack/heap of processes
386 which are enabled by default.
389 int "Timer Frequency"
392 config ARC_METAWARE_HLINK
393 bool "Support for Metaware debugger assisted Host access"
396 This options allows a Linux userland apps to directly access
397 host file system (open/creat/read/write etc) with help from
398 Metaware Debugger. This can come in handy for Linux-host communication
399 when there is no real usable peripheral such as EMAC.
405 config ARC_DW2_UNWIND
406 bool "Enable DWARF specific kernel stack unwind"
411 Compiles the kernel with DWARF unwind information and can be used
412 to get stack backtraces.
414 If you say Y here the resulting kernel image will be slightly larger
415 but not slower, and it will give very useful debugging information.
416 If you don't debug the kernel, you can say N, but we may not be able
417 to solve problems without frame unwind information
419 config ARC_DBG_TLB_PARANOIA
420 bool "Paranoia Checks in Low Level TLB Handlers"
424 config ARC_DBG_TLB_MISS_COUNT
425 bool "Profile TLB Misses"
430 Counts number of I and D TLB Misses and exports them via Debugfs
431 The counters can be cleared via Debugfs as well
434 string "Kernel command line to built-in"
435 default "print-fatal-signals=1"
437 The default command line which will be appended to the optional
438 u-boot provided command line (see below)
441 bool "Support U-boot kernel command line passing"
444 If you are using U-boot (www.denx.de) and wish to pass the kernel
445 command line from the U-boot environment to the Linux kernel then
446 switch this option on.
447 ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
448 to it. kernel startup code will copy the string into cmdline buffer
449 and also append CONFIG_CMDLINE.
451 config ARC_BUILTIN_DTB_NAME
452 string "Built in DTB"
454 Set the name of the DTB to embed in the vmlinux binary
455 Leaving it blank selects the minimal "skeleton" dtb
457 source "kernel/Kconfig.preempt"
459 endmenu # "ARC Architecture Configuration"
463 source "drivers/Kconfig"
465 source "arch/arc/Kconfig.debug"
466 source "security/Kconfig"
467 source "crypto/Kconfig"