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"
87 default ARC_PLAT_FPGA_LEGACY
89 config ARC_PLAT_FPGA_LEGACY
90 bool "\"Legacy\" ARC FPGA dev platform"
92 Support for ARC development platforms, provided by Synopsys.
93 These are based on FPGA or ISS. e.g.
98 #New platform adds here
101 menu "ARC CPU Configuration"
110 Support for ARC750 core
114 select ARC_CPU_REL_4_10
116 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
117 This core has a bunch of cool new features:
118 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
119 Shared Address Spaces (for sharing TLB entires in MMU)
120 -Caches: New Prog Model, Region Flush
121 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
125 config CPU_BIG_ENDIAN
126 bool "Enable Big Endian Mode"
129 Build kernel for Big Endian Mode of ARC CPU
132 bool "Symmetric Multi-Processing (Incomplete)"
134 select USE_GENERIC_SMP_HELPERS
136 This enables support for systems with more than one CPU. If you have
137 a system with only one CPU, like most personal computers, say N. If
138 you have a system with more than one CPU, say Y.
142 config ARC_HAS_COH_CACHES
145 config ARC_HAS_COH_LLSC
148 config ARC_HAS_COH_RTSC
151 config ARC_HAS_REENTRANT_IRQ_LV2
157 int "Maximum number of CPUs (2-32)"
163 bool "Enable Cache Support"
165 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
166 depends on !SMP || ARC_HAS_COH_CACHES
170 config ARC_CACHE_LINE_SHIFT
171 int "Cache Line Length (as power of 2)"
175 Starting with ARC700 4.9, Cache line length is configurable,
176 This option specifies "N", with Line-len = 2 power N
177 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
178 Linux only supports same line lengths for I and D caches.
180 config ARC_HAS_ICACHE
181 bool "Use Instruction Cache"
184 config ARC_HAS_DCACHE
185 bool "Use Data Cache"
188 config ARC_CACHE_PAGES
189 bool "Per Page Cache Control"
191 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
193 This can be used to over-ride the global I/D Cache Enable on a
194 per-page basis (but only for pages accessed via MMU such as
195 Kernel Virtual address or User Virtual Address)
196 TLB entries have a per-page Cache Enable Bit.
197 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
198 Global DISABLE + Per Page ENABLE won't work
205 Single Cycle RAMS to store Fast Path Code
209 int "ICCM Size in KB"
211 depends on ARC_HAS_ICCM
216 Single Cycle RAMS to store Fast Path Data
220 int "DCCM Size in KB"
222 depends on ARC_HAS_DCCM
225 hex "DCCM map address"
227 depends on ARC_HAS_DCCM
229 config ARC_HAS_HW_MPY
230 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
233 Influences how gcc generates code for MPY operations.
234 If enabled, MPYxx insns are generated, provided by Standard/XMAC
235 Multipler. Otherwise software multipy lib is used
238 prompt "ARC700 MMU Version"
239 default ARC_MMU_V3 if ARC_CPU_770
240 default ARC_MMU_V2 if ARC_CPU_750D
250 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
251 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
255 depends on ARC_CPU_770
257 Introduced with ARC700 4.10: New Features
258 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
259 Shared Address Spaces (SASID)
265 prompt "MMU Page Size"
266 default ARC_PAGE_SIZE_8K
268 config ARC_PAGE_SIZE_8K
271 Choose between 8k vs 16k
273 config ARC_PAGE_SIZE_16K
275 depends on ARC_MMU_V3
277 config ARC_PAGE_SIZE_4K
279 depends on ARC_MMU_V3
283 config ARC_COMPACT_IRQ_LEVELS
284 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
286 # Timer HAS to be high priority, for any other high priority config
288 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
289 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
291 if ARC_COMPACT_IRQ_LEVELS
304 config ARC_FPU_SAVE_RESTORE
305 bool "Enable FPU state persistence across context switch"
308 Double Precision Floating Point unit had dedictaed regs which
309 need to be saved/restored across context-switch.
310 Note that ARC FPU is overly simplistic, unlike say x86, which has
311 hardware pieces to allow software to conditionally save/restore,
312 based on actual usage of FPU by a task. Thus our implemn does
313 this for all tasks in system.
315 menuconfig ARC_CPU_REL_4_10
316 bool "Enable support for Rel 4.10 features"
319 -ARC770 (and dependent features) enabled
320 -ARC750 also shares some of the new features with 770
323 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
325 depends on ARC_CPU_770
326 # if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
327 depends on !SMP || ARC_HAS_COH_LLSC
330 bool "Insn: SWAPE (endian-swap)"
332 depends on ARC_CPU_REL_4_10
335 bool "Insn: RTSC (64-bit r/o cycle counter)"
337 depends on ARC_CPU_REL_4_10
338 # if SMP, enable RTSC only if counter is coherent across cores
339 depends on !SMP || ARC_HAS_COH_RTSC
341 endmenu # "ARC CPU Configuration"
343 menu "Platform Board Configuration"
345 source "arch/arc/plat-arcfpga/Kconfig"
347 #New platform adds here
349 config LINUX_LINK_BASE
350 hex "Linux Link Address"
353 ARC700 divides the 32 bit phy address space into two equal halves
354 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
355 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
356 Typically Linux kernel is linked at the start of untransalted addr,
357 hence the default value of 0x8zs.
358 However some customers have peripherals mapped at this addr, so
359 Linux needs to be scooted a bit.
360 If you don't know what the above means, leave this setting alone.
362 endmenu # "Platform Board Configuration"
364 config ARC_CURR_IN_REG
365 bool "Dedicate Register r25 for current_task pointer"
368 This reserved Register R25 to point to Current Task in
369 kernel mode. This saves memory access for each such access
372 config ARC_MISALIGN_ACCESS
373 bool "Emulate unaligned memory access (userspace only)"
375 select SYSCTL_ARCH_UNALIGN_NO_WARN
376 select SYSCTL_ARCH_UNALIGN_ALLOW
378 This enables misaligned 16 & 32 bit memory access from user space.
379 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
380 potential bugs in code
382 config ARC_STACK_NONEXEC
383 bool "Make stack non-executable"
386 To disable the execute permissions of stack/heap of processes
387 which are enabled by default.
390 int "Timer Frequency"
393 config ARC_METAWARE_HLINK
394 bool "Support for Metaware debugger assisted Host access"
397 This options allows a Linux userland apps to directly access
398 host file system (open/creat/read/write etc) with help from
399 Metaware Debugger. This can come in handy for Linux-host communication
400 when there is no real usable peripheral such as EMAC.
406 config ARC_DW2_UNWIND
407 bool "Enable DWARF specific kernel stack unwind"
412 Compiles the kernel with DWARF unwind information and can be used
413 to get stack backtraces.
415 If you say Y here the resulting kernel image will be slightly larger
416 but not slower, and it will give very useful debugging information.
417 If you don't debug the kernel, you can say N, but we may not be able
418 to solve problems without frame unwind information
420 config ARC_DBG_TLB_PARANOIA
421 bool "Paranoia Checks in Low Level TLB Handlers"
425 config ARC_DBG_TLB_MISS_COUNT
426 bool "Profile TLB Misses"
431 Counts number of I and D TLB Misses and exports them via Debugfs
432 The counters can be cleared via Debugfs as well
435 string "Kernel command line to built-in"
436 default "print-fatal-signals=1"
438 The default command line which will be appended to the optional
439 u-boot provided command line (see below)
442 bool "Support U-boot kernel command line passing"
445 If you are using U-boot (www.denx.de) and wish to pass the kernel
446 command line from the U-boot environment to the Linux kernel then
447 switch this option on.
448 ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
449 to it. kernel startup code will copy the string into cmdline buffer
450 and also append CONFIG_CMDLINE.
452 config ARC_BUILTIN_DTB_NAME
453 string "Built in DTB"
455 Set the name of the DTB to embed in the vmlinux binary
456 Leaving it blank selects the minimal "skeleton" dtb
458 source "kernel/Kconfig.preempt"
460 endmenu # "ARC Architecture Configuration"
464 source "drivers/Kconfig"
466 source "arch/arc/Kconfig.debug"
467 source "security/Kconfig"
468 source "crypto/Kconfig"