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_KERNEL_EXECVE
20 select GENERIC_KERNEL_THREAD
21 select GENERIC_PENDING_IRQ if SMP
22 select GENERIC_SIGALTSTACK
23 select GENERIC_SMP_IDLE_THREAD
25 select HAVE_ARCH_TRACEHOOK
26 select HAVE_GENERIC_HARDIRQS
27 select HAVE_IOREMAP_PROT
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
79 config ARCH_NO_VIRT_TO_BUS
83 source "kernel/Kconfig.freezer"
85 menu "ARC Architecture Configuration"
87 menu "ARC Platform/SoC/Board"
89 source "arch/arc/plat-arcfpga/Kconfig"
90 #New platform adds here
94 menu "ARC CPU Configuration"
103 Support for ARC750 core
107 select ARC_CPU_REL_4_10
109 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
110 This core has a bunch of cool new features:
111 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
112 Shared Address Spaces (for sharing TLB entires in MMU)
113 -Caches: New Prog Model, Region Flush
114 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
118 config CPU_BIG_ENDIAN
119 bool "Enable Big Endian Mode"
122 Build kernel for Big Endian Mode of ARC CPU
124 # If a platform can't work with 0x8000_0000 based dma_addr_t
125 config ARC_PLAT_NEEDS_CPU_TO_DMA
129 bool "Symmetric Multi-Processing (Incomplete)"
131 select USE_GENERIC_SMP_HELPERS
133 This enables support for systems with more than one CPU. If you have
134 a system with only one CPU, like most personal computers, say N. If
135 you have a system with more than one CPU, say Y.
139 config ARC_HAS_COH_CACHES
142 config ARC_HAS_COH_LLSC
145 config ARC_HAS_COH_RTSC
148 config ARC_HAS_REENTRANT_IRQ_LV2
154 int "Maximum number of CPUs (2-32)"
160 bool "Enable Cache Support"
162 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
163 depends on !SMP || ARC_HAS_COH_CACHES
167 config ARC_CACHE_LINE_SHIFT
168 int "Cache Line Length (as power of 2)"
172 Starting with ARC700 4.9, Cache line length is configurable,
173 This option specifies "N", with Line-len = 2 power N
174 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
175 Linux only supports same line lengths for I and D caches.
177 config ARC_HAS_ICACHE
178 bool "Use Instruction Cache"
181 config ARC_HAS_DCACHE
182 bool "Use Data Cache"
185 config ARC_CACHE_PAGES
186 bool "Per Page Cache Control"
188 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
190 This can be used to over-ride the global I/D Cache Enable on a
191 per-page basis (but only for pages accessed via MMU such as
192 Kernel Virtual address or User Virtual Address)
193 TLB entries have a per-page Cache Enable Bit.
194 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
195 Global DISABLE + Per Page ENABLE won't work
202 Single Cycle RAMS to store Fast Path Code
206 int "ICCM Size in KB"
208 depends on ARC_HAS_ICCM
213 Single Cycle RAMS to store Fast Path Data
217 int "DCCM Size in KB"
219 depends on ARC_HAS_DCCM
222 hex "DCCM map address"
224 depends on ARC_HAS_DCCM
226 config ARC_HAS_HW_MPY
227 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
230 Influences how gcc generates code for MPY operations.
231 If enabled, MPYxx insns are generated, provided by Standard/XMAC
232 Multipler. Otherwise software multipy lib is used
235 prompt "ARC700 MMU Version"
236 default ARC_MMU_V3 if ARC_CPU_770
237 default ARC_MMU_V2 if ARC_CPU_750D
247 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
248 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
252 depends on ARC_CPU_770
254 Introduced with ARC700 4.10: New Features
255 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
256 Shared Address Spaces (SASID)
262 prompt "MMU Page Size"
263 default ARC_PAGE_SIZE_8K
265 config ARC_PAGE_SIZE_8K
268 Choose between 8k vs 16k
270 config ARC_PAGE_SIZE_16K
272 depends on ARC_MMU_V3
274 config ARC_PAGE_SIZE_4K
276 depends on ARC_MMU_V3
280 config ARC_COMPACT_IRQ_LEVELS
281 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
283 # Timer HAS to be high priority, for any other high priority config
285 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
286 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
288 if ARC_COMPACT_IRQ_LEVELS
301 config ARC_FPU_SAVE_RESTORE
302 bool "Enable FPU state persistence across context switch"
305 Double Precision Floating Point unit had dedictaed regs which
306 need to be saved/restored across context-switch.
307 Note that ARC FPU is overly simplistic, unlike say x86, which has
308 hardware pieces to allow software to conditionally save/restore,
309 based on actual usage of FPU by a task. Thus our implemn does
310 this for all tasks in system.
312 menuconfig ARC_CPU_REL_4_10
313 bool "Enable support for Rel 4.10 features"
316 -ARC770 (and dependent features) enabled
317 -ARC750 also shares some of the new features with 770
320 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
322 depends on ARC_CPU_770
323 # if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
324 depends on !SMP || ARC_HAS_COH_LLSC
327 bool "Insn: SWAPE (endian-swap)"
329 depends on ARC_CPU_REL_4_10
332 bool "Insn: RTSC (64-bit r/o cycle counter)"
334 depends on ARC_CPU_REL_4_10
335 # if SMP, enable RTSC only if counter is coherent across cores
336 depends on !SMP || ARC_HAS_COH_RTSC
338 endmenu # "ARC CPU Configuration"
340 config LINUX_LINK_BASE
341 hex "Linux Link Address"
344 ARC700 divides the 32 bit phy address space into two equal halves
345 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
346 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
347 Typically Linux kernel is linked at the start of untransalted addr,
348 hence the default value of 0x8zs.
349 However some customers have peripherals mapped at this addr, so
350 Linux needs to be scooted a bit.
351 If you don't know what the above means, leave this setting alone.
353 config ARC_CURR_IN_REG
354 bool "Dedicate Register r25 for current_task pointer"
357 This reserved Register R25 to point to Current Task in
358 kernel mode. This saves memory access for each such access
361 config ARC_MISALIGN_ACCESS
362 bool "Emulate unaligned memory access (userspace only)"
364 select SYSCTL_ARCH_UNALIGN_NO_WARN
365 select SYSCTL_ARCH_UNALIGN_ALLOW
367 This enables misaligned 16 & 32 bit memory access from user space.
368 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
369 potential bugs in code
371 config ARC_STACK_NONEXEC
372 bool "Make stack non-executable"
375 To disable the execute permissions of stack/heap of processes
376 which are enabled by default.
379 int "Timer Frequency"
382 config ARC_METAWARE_HLINK
383 bool "Support for Metaware debugger assisted Host access"
386 This options allows a Linux userland apps to directly access
387 host file system (open/creat/read/write etc) with help from
388 Metaware Debugger. This can come in handy for Linux-host communication
389 when there is no real usable peripheral such as EMAC.
395 config ARC_DW2_UNWIND
396 bool "Enable DWARF specific kernel stack unwind"
401 Compiles the kernel with DWARF unwind information and can be used
402 to get stack backtraces.
404 If you say Y here the resulting kernel image will be slightly larger
405 but not slower, and it will give very useful debugging information.
406 If you don't debug the kernel, you can say N, but we may not be able
407 to solve problems without frame unwind information
409 config ARC_DBG_TLB_PARANOIA
410 bool "Paranoia Checks in Low Level TLB Handlers"
414 config ARC_DBG_TLB_MISS_COUNT
415 bool "Profile TLB Misses"
420 Counts number of I and D TLB Misses and exports them via Debugfs
421 The counters can be cleared via Debugfs as well
424 string "Kernel command line to built-in"
425 default "print-fatal-signals=1"
427 The default command line which will be appended to the optional
428 u-boot provided command line (see below)
431 bool "Support U-boot kernel command line passing"
434 If you are using U-boot (www.denx.de) and wish to pass the kernel
435 command line from the U-boot environment to the Linux kernel then
436 switch this option on.
437 ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
438 to it. kernel startup code will copy the string into cmdline buffer
439 and also append CONFIG_CMDLINE.
441 config ARC_BUILTIN_DTB_NAME
442 string "Built in DTB"
444 Set the name of the DTB to embed in the vmlinux binary
445 Leaving it blank selects the minimal "skeleton" dtb
447 source "kernel/Kconfig.preempt"
449 endmenu # "ARC Architecture Configuration"
453 source "drivers/Kconfig"
455 source "arch/arc/Kconfig.debug"
456 source "security/Kconfig"
457 source "crypto/Kconfig"