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 source "arch/arc/plat-tb10x/Kconfig"
81 #New platform adds here
85 menu "ARC CPU Configuration"
94 Support for ARC750 core
98 select ARC_CPU_REL_4_10
100 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
101 This core has a bunch of cool new features:
102 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
103 Shared Address Spaces (for sharing TLB entires in MMU)
104 -Caches: New Prog Model, Region Flush
105 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
109 config CPU_BIG_ENDIAN
110 bool "Enable Big Endian Mode"
113 Build kernel for Big Endian Mode of ARC CPU
115 # If a platform can't work with 0x8000_0000 based dma_addr_t
116 config ARC_PLAT_NEEDS_CPU_TO_DMA
120 bool "Symmetric Multi-Processing (Incomplete)"
122 select USE_GENERIC_SMP_HELPERS
124 This enables support for systems with more than one CPU. If you have
125 a system with only one CPU, like most personal computers, say N. If
126 you have a system with more than one CPU, say Y.
130 config ARC_HAS_COH_CACHES
133 config ARC_HAS_COH_RTSC
136 config ARC_HAS_REENTRANT_IRQ_LV2
142 int "Maximum number of CPUs (2-32)"
148 bool "Enable Cache Support"
150 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
151 depends on !SMP || ARC_HAS_COH_CACHES
155 config ARC_CACHE_LINE_SHIFT
156 int "Cache Line Length (as power of 2)"
160 Starting with ARC700 4.9, Cache line length is configurable,
161 This option specifies "N", with Line-len = 2 power N
162 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
163 Linux only supports same line lengths for I and D caches.
165 config ARC_HAS_ICACHE
166 bool "Use Instruction Cache"
169 config ARC_HAS_DCACHE
170 bool "Use Data Cache"
173 config ARC_CACHE_PAGES
174 bool "Per Page Cache Control"
176 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
178 This can be used to over-ride the global I/D Cache Enable on a
179 per-page basis (but only for pages accessed via MMU such as
180 Kernel Virtual address or User Virtual Address)
181 TLB entries have a per-page Cache Enable Bit.
182 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
183 Global DISABLE + Per Page ENABLE won't work
190 Single Cycle RAMS to store Fast Path Code
194 int "ICCM Size in KB"
196 depends on ARC_HAS_ICCM
201 Single Cycle RAMS to store Fast Path Data
205 int "DCCM Size in KB"
207 depends on ARC_HAS_DCCM
210 hex "DCCM map address"
212 depends on ARC_HAS_DCCM
214 config ARC_HAS_HW_MPY
215 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
218 Influences how gcc generates code for MPY operations.
219 If enabled, MPYxx insns are generated, provided by Standard/XMAC
220 Multipler. Otherwise software multipy lib is used
223 prompt "ARC700 MMU Version"
224 default ARC_MMU_V3 if ARC_CPU_770
225 default ARC_MMU_V2 if ARC_CPU_750D
235 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
236 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
240 depends on ARC_CPU_770
242 Introduced with ARC700 4.10: New Features
243 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
244 Shared Address Spaces (SASID)
250 prompt "MMU Page Size"
251 default ARC_PAGE_SIZE_8K
253 config ARC_PAGE_SIZE_8K
256 Choose between 8k vs 16k
258 config ARC_PAGE_SIZE_16K
260 depends on ARC_MMU_V3
262 config ARC_PAGE_SIZE_4K
264 depends on ARC_MMU_V3
268 config ARC_COMPACT_IRQ_LEVELS
269 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
271 # Timer HAS to be high priority, for any other high priority config
273 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
274 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
276 if ARC_COMPACT_IRQ_LEVELS
289 config ARC_FPU_SAVE_RESTORE
290 bool "Enable FPU state persistence across context switch"
293 Double Precision Floating Point unit had dedictaed regs which
294 need to be saved/restored across context-switch.
295 Note that ARC FPU is overly simplistic, unlike say x86, which has
296 hardware pieces to allow software to conditionally save/restore,
297 based on actual usage of FPU by a task. Thus our implemn does
298 this for all tasks in system.
303 menuconfig ARC_CPU_REL_4_10
304 bool "Enable support for Rel 4.10 features"
307 -ARC770 (and dependent features) enabled
308 -ARC750 also shares some of the new features with 770
311 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
313 depends on ARC_CPU_770 && !ARC_CANT_LLSC
316 bool "Insn: SWAPE (endian-swap)"
318 depends on ARC_CPU_REL_4_10
321 bool "Insn: RTSC (64-bit r/o cycle counter)"
323 depends on ARC_CPU_REL_4_10
324 # if SMP, enable RTSC only if counter is coherent across cores
325 depends on !SMP || ARC_HAS_COH_RTSC
327 endmenu # "ARC CPU Configuration"
329 config LINUX_LINK_BASE
330 hex "Linux Link Address"
333 ARC700 divides the 32 bit phy address space into two equal halves
334 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
335 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
336 Typically Linux kernel is linked at the start of untransalted addr,
337 hence the default value of 0x8zs.
338 However some customers have peripherals mapped at this addr, so
339 Linux needs to be scooted a bit.
340 If you don't know what the above means, leave this setting alone.
342 config ARC_CURR_IN_REG
343 bool "Dedicate Register r25 for current_task pointer"
346 This reserved Register R25 to point to Current Task in
347 kernel mode. This saves memory access for each such access
350 config ARC_MISALIGN_ACCESS
351 bool "Emulate unaligned memory access (userspace only)"
353 select SYSCTL_ARCH_UNALIGN_NO_WARN
354 select SYSCTL_ARCH_UNALIGN_ALLOW
356 This enables misaligned 16 & 32 bit memory access from user space.
357 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
358 potential bugs in code
360 config ARC_STACK_NONEXEC
361 bool "Make stack non-executable"
364 To disable the execute permissions of stack/heap of processes
365 which are enabled by default.
368 int "Timer Frequency"
371 config ARC_METAWARE_HLINK
372 bool "Support for Metaware debugger assisted Host access"
375 This options allows a Linux userland apps to directly access
376 host file system (open/creat/read/write etc) with help from
377 Metaware Debugger. This can come in handy for Linux-host communication
378 when there is no real usable peripheral such as EMAC.
384 config ARC_DW2_UNWIND
385 bool "Enable DWARF specific kernel stack unwind"
390 Compiles the kernel with DWARF unwind information and can be used
391 to get stack backtraces.
393 If you say Y here the resulting kernel image will be slightly larger
394 but not slower, and it will give very useful debugging information.
395 If you don't debug the kernel, you can say N, but we may not be able
396 to solve problems without frame unwind information
398 config ARC_DBG_TLB_PARANOIA
399 bool "Paranoia Checks in Low Level TLB Handlers"
403 config ARC_DBG_TLB_MISS_COUNT
404 bool "Profile TLB Misses"
409 Counts number of I and D TLB Misses and exports them via Debugfs
410 The counters can be cleared via Debugfs as well
413 bool "Support U-boot kernel command line passing"
416 If you are using U-boot (www.denx.de) and wish to pass the kernel
417 command line from the U-boot environment to the Linux kernel then
418 switch this option on.
419 ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
420 to it. kernel startup code will append this to DeviceTree
421 /bootargs provided cmdline args.
423 config ARC_BUILTIN_DTB_NAME
424 string "Built in DTB"
426 Set the name of the DTB to embed in the vmlinux binary
427 Leaving it blank selects the minimal "skeleton" dtb
429 source "kernel/Kconfig.preempt"
431 menu "Executable file formats"
432 source "fs/Kconfig.binfmt"
435 endmenu # "ARC Architecture Configuration"
439 source "drivers/Kconfig"
441 source "arch/arc/Kconfig.debug"
442 source "security/Kconfig"
443 source "crypto/Kconfig"