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
25 select HAVE_GENERIC_HARDIRQS
28 select MODULES_USE_ELF_RELA
31 select OF_EARLY_FLATTREE
33 config SCHED_OMIT_FRAME_POINTER
39 config RWSEM_GENERIC_SPINLOCK
42 config ARCH_FLATMEM_ENABLE
51 config GENERIC_CALIBRATE_DELAY
54 config GENERIC_HWEIGHT
60 config HAVE_LATENCYTOP_SUPPORT
67 source "kernel/Kconfig.freezer"
69 menu "ARC Architecture Configuration"
73 default ARC_PLAT_FPGA_LEGACY
75 config ARC_PLAT_FPGA_LEGACY
76 bool "\"Legacy\" ARC FPGA dev platform"
78 Support for ARC development platforms, provided by Synopsys.
79 These are based on FPGA or ISS. e.g.
84 #New platform adds here
87 menu "ARC CPU Configuration"
96 Support for ARC750 core
100 select ARC_CPU_REL_4_10
102 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
103 This core has a bunch of cool new features:
104 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
105 Shared Address Spaces (for sharing TLB entires in MMU)
106 -Caches: New Prog Model, Region Flush
107 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
111 config CPU_BIG_ENDIAN
112 bool "Enable Big Endian Mode"
115 Build kernel for Big Endian Mode of ARC CPU
118 bool "Enable Cache Support"
123 config ARC_CACHE_LINE_SHIFT
124 int "Cache Line Length (as power of 2)"
128 Starting with ARC700 4.9, Cache line length is configurable,
129 This option specifies "N", with Line-len = 2 power N
130 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
131 Linux only supports same line lengths for I and D caches.
133 config ARC_HAS_ICACHE
134 bool "Use Instruction Cache"
137 config ARC_HAS_DCACHE
138 bool "Use Data Cache"
141 config ARC_CACHE_PAGES
142 bool "Per Page Cache Control"
144 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
146 This can be used to over-ride the global I/D Cache Enable on a
147 per-page basis (but only for pages accessed via MMU such as
148 Kernel Virtual address or User Virtual Address)
149 TLB entries have a per-page Cache Enable Bit.
150 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
151 Global DISABLE + Per Page ENABLE won't work
155 config ARC_HAS_HW_MPY
156 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
159 Influences how gcc generates code for MPY operations.
160 If enabled, MPYxx insns are generated, provided by Standard/XMAC
161 Multipler. Otherwise software multipy lib is used
164 prompt "ARC700 MMU Version"
165 default ARC_MMU_V3 if ARC_CPU_770
166 default ARC_MMU_V2 if ARC_CPU_750D
176 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
177 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
181 depends on ARC_CPU_770
183 Introduced with ARC700 4.10: New Features
184 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
185 Shared Address Spaces (SASID)
191 prompt "MMU Page Size"
192 default ARC_PAGE_SIZE_8K
194 config ARC_PAGE_SIZE_8K
197 Choose between 8k vs 16k
199 config ARC_PAGE_SIZE_16K
201 depends on ARC_MMU_V3
203 config ARC_PAGE_SIZE_4K
205 depends on ARC_MMU_V3
209 config ARC_FPU_SAVE_RESTORE
210 bool "Enable FPU state persistence across context switch"
213 Double Precision Floating Point unit had dedictaed regs which
214 need to be saved/restored across context-switch.
215 Note that ARC FPU is overly simplistic, unlike say x86, which has
216 hardware pieces to allow software to conditionally save/restore,
217 based on actual usage of FPU by a task. Thus our implemn does
218 this for all tasks in system.
220 menuconfig ARC_CPU_REL_4_10
221 bool "Enable support for Rel 4.10 features"
224 -ARC770 (and dependent features) enabled
225 -ARC750 also shares some of the new features with 770
228 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
230 depends on ARC_CPU_770
231 # if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
232 depends on !SMP || ARC_HAS_COH_LLSC
235 bool "Insn: SWAPE (endian-swap)"
237 depends on ARC_CPU_REL_4_10
240 bool "Insn: RTSC (64-bit r/o cycle counter)"
242 depends on ARC_CPU_REL_4_10
244 endmenu # "ARC CPU Configuration"
246 menu "Platform Board Configuration"
248 source "arch/arc/plat-arcfpga/Kconfig"
250 #New platform adds here
252 config LINUX_LINK_BASE
253 hex "Linux Link Address"
256 ARC700 divides the 32 bit phy address space into two equal halves
257 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
258 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
259 Typically Linux kernel is linked at the start of untransalted addr,
260 hence the default value of 0x8zs.
261 However some customers have peripherals mapped at this addr, so
262 Linux needs to be scooted a bit.
263 If you don't know what the above means, leave this setting alone.
265 endmenu # "Platform Board Configuration"
267 config ARC_CURR_IN_REG
268 bool "Dedicate Register r25 for current_task pointer"
271 This reserved Register R25 to point to Current Task in
272 kernel mode. This saves memory access for each such access
274 config ARC_STACK_NONEXEC
275 bool "Make stack non-executable"
278 To disable the execute permissions of stack/heap of processes
279 which are enabled by default.
282 int "Timer Frequency"
289 config ARC_DBG_TLB_PARANOIA
290 bool "Paranoia Checks in Low Level TLB Handlers"
294 config ARC_DBG_TLB_MISS_COUNT
295 bool "Profile TLB Misses"
300 Counts number of I and D TLB Misses and exports them via Debugfs
301 The counters can be cleared via Debugfs as well
304 string "Kernel command line to built-in"
305 default "print-fatal-signals=1"
307 The default command line which will be appended to the optional
308 u-boot provided command line (see below)
311 bool "Support U-boot kernel command line passing"
314 If you are using U-boot (www.denx.de) and wish to pass the kernel
315 command line from the U-boot environment to the Linux kernel then
316 switch this option on.
317 ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
318 to it. kernel startup code will copy the string into cmdline buffer
319 and also append CONFIG_CMDLINE.
321 config ARC_BUILTIN_DTB_NAME
322 string "Built in DTB"
324 Set the name of the DTB to embed in the vmlinux binary
325 Leaving it blank selects the minimal "skeleton" dtb
327 source "kernel/Kconfig.preempt"
329 endmenu # "ARC Architecture Configuration"
333 source "drivers/Kconfig"
335 source "arch/arc/Kconfig.debug"
336 source "security/Kconfig"
337 source "crypto/Kconfig"