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
28 select HAVE_IOREMAP_PROT
31 select HAVE_KRETPROBES
33 select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
35 select HAVE_PERF_EVENTS
37 select MODULES_USE_ELF_RELA
40 select OF_EARLY_FLATTREE
41 select PERF_USE_VMALLOC
43 config SCHED_OMIT_FRAME_POINTER
49 config RWSEM_GENERIC_SPINLOCK
52 config ARCH_FLATMEM_ENABLE
61 config GENERIC_CALIBRATE_DELAY
64 config GENERIC_HWEIGHT
70 config STACKTRACE_SUPPORT
74 config HAVE_LATENCYTOP_SUPPORT
81 source "kernel/Kconfig.freezer"
83 menu "ARC Architecture Configuration"
85 menu "ARC Platform/SoC/Board"
87 source "arch/arc/plat-arcfpga/Kconfig"
88 #New platform adds here
92 menu "ARC CPU Configuration"
101 Support for ARC750 core
105 select ARC_CPU_REL_4_10
107 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
108 This core has a bunch of cool new features:
109 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
110 Shared Address Spaces (for sharing TLB entires in MMU)
111 -Caches: New Prog Model, Region Flush
112 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
116 config CPU_BIG_ENDIAN
117 bool "Enable Big Endian Mode"
120 Build kernel for Big Endian Mode of ARC CPU
122 # If a platform can't work with 0x8000_0000 based dma_addr_t
123 config ARC_PLAT_NEEDS_CPU_TO_DMA
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
200 Single Cycle RAMS to store Fast Path Code
204 int "ICCM Size in KB"
206 depends on ARC_HAS_ICCM
211 Single Cycle RAMS to store Fast Path Data
215 int "DCCM Size in KB"
217 depends on ARC_HAS_DCCM
220 hex "DCCM map address"
222 depends on ARC_HAS_DCCM
224 config ARC_HAS_HW_MPY
225 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
228 Influences how gcc generates code for MPY operations.
229 If enabled, MPYxx insns are generated, provided by Standard/XMAC
230 Multipler. Otherwise software multipy lib is used
233 prompt "ARC700 MMU Version"
234 default ARC_MMU_V3 if ARC_CPU_770
235 default ARC_MMU_V2 if ARC_CPU_750D
245 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
246 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
250 depends on ARC_CPU_770
252 Introduced with ARC700 4.10: New Features
253 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
254 Shared Address Spaces (SASID)
260 prompt "MMU Page Size"
261 default ARC_PAGE_SIZE_8K
263 config ARC_PAGE_SIZE_8K
266 Choose between 8k vs 16k
268 config ARC_PAGE_SIZE_16K
270 depends on ARC_MMU_V3
272 config ARC_PAGE_SIZE_4K
274 depends on ARC_MMU_V3
278 config ARC_COMPACT_IRQ_LEVELS
279 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
281 # Timer HAS to be high priority, for any other high priority config
283 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
284 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
286 if ARC_COMPACT_IRQ_LEVELS
299 config ARC_FPU_SAVE_RESTORE
300 bool "Enable FPU state persistence across context switch"
303 Double Precision Floating Point unit had dedictaed regs which
304 need to be saved/restored across context-switch.
305 Note that ARC FPU is overly simplistic, unlike say x86, which has
306 hardware pieces to allow software to conditionally save/restore,
307 based on actual usage of FPU by a task. Thus our implemn does
308 this for all tasks in system.
310 menuconfig ARC_CPU_REL_4_10
311 bool "Enable support for Rel 4.10 features"
314 -ARC770 (and dependent features) enabled
315 -ARC750 also shares some of the new features with 770
318 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
320 depends on ARC_CPU_770
321 # if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
322 depends on !SMP || ARC_HAS_COH_LLSC
325 bool "Insn: SWAPE (endian-swap)"
327 depends on ARC_CPU_REL_4_10
330 bool "Insn: RTSC (64-bit r/o cycle counter)"
332 depends on ARC_CPU_REL_4_10
333 # if SMP, enable RTSC only if counter is coherent across cores
334 depends on !SMP || ARC_HAS_COH_RTSC
336 endmenu # "ARC CPU Configuration"
338 config LINUX_LINK_BASE
339 hex "Linux Link Address"
342 ARC700 divides the 32 bit phy address space into two equal halves
343 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
344 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
345 Typically Linux kernel is linked at the start of untransalted addr,
346 hence the default value of 0x8zs.
347 However some customers have peripherals mapped at this addr, so
348 Linux needs to be scooted a bit.
349 If you don't know what the above means, leave this setting alone.
351 config ARC_CURR_IN_REG
352 bool "Dedicate Register r25 for current_task pointer"
355 This reserved Register R25 to point to Current Task in
356 kernel mode. This saves memory access for each such access
359 config ARC_MISALIGN_ACCESS
360 bool "Emulate unaligned memory access (userspace only)"
362 select SYSCTL_ARCH_UNALIGN_NO_WARN
363 select SYSCTL_ARCH_UNALIGN_ALLOW
365 This enables misaligned 16 & 32 bit memory access from user space.
366 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
367 potential bugs in code
369 config ARC_STACK_NONEXEC
370 bool "Make stack non-executable"
373 To disable the execute permissions of stack/heap of processes
374 which are enabled by default.
377 int "Timer Frequency"
380 config ARC_METAWARE_HLINK
381 bool "Support for Metaware debugger assisted Host access"
384 This options allows a Linux userland apps to directly access
385 host file system (open/creat/read/write etc) with help from
386 Metaware Debugger. This can come in handy for Linux-host communication
387 when there is no real usable peripheral such as EMAC.
393 config ARC_DW2_UNWIND
394 bool "Enable DWARF specific kernel stack unwind"
399 Compiles the kernel with DWARF unwind information and can be used
400 to get stack backtraces.
402 If you say Y here the resulting kernel image will be slightly larger
403 but not slower, and it will give very useful debugging information.
404 If you don't debug the kernel, you can say N, but we may not be able
405 to solve problems without frame unwind information
407 config ARC_DBG_TLB_PARANOIA
408 bool "Paranoia Checks in Low Level TLB Handlers"
412 config ARC_DBG_TLB_MISS_COUNT
413 bool "Profile TLB Misses"
418 Counts number of I and D TLB Misses and exports them via Debugfs
419 The counters can be cleared via Debugfs as well
422 string "Kernel command line to built-in"
423 default "print-fatal-signals=1"
425 The default command line which will be appended to the optional
426 u-boot provided command line (see below)
429 bool "Support U-boot kernel command line passing"
432 If you are using U-boot (www.denx.de) and wish to pass the kernel
433 command line from the U-boot environment to the Linux kernel then
434 switch this option on.
435 ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
436 to it. kernel startup code will copy the string into cmdline buffer
437 and also append CONFIG_CMDLINE.
439 config ARC_BUILTIN_DTB_NAME
440 string "Built in DTB"
442 Set the name of the DTB to embed in the vmlinux binary
443 Leaving it blank selects the minimal "skeleton" dtb
445 source "kernel/Kconfig.preempt"
447 endmenu # "ARC Architecture Configuration"
451 source "drivers/Kconfig"
453 source "arch/arc/Kconfig.debug"
454 source "security/Kconfig"
455 source "crypto/Kconfig"