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_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC
12 select BUILDTIME_EXTABLE_SORT
14 select CLONE_BACKWARDS
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_PCI_IOMAP
21 select GENERIC_PENDING_IRQ if SMP
22 select GENERIC_SMP_IDLE_THREAD
24 select HAVE_ARCH_TRACEHOOK
25 select HAVE_FUTEX_CMPXCHG
26 select HAVE_IOREMAP_PROT
28 select HAVE_KRETPROBES
30 select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
32 select HAVE_PERF_EVENTS
34 select MODULES_USE_ELF_RELA
37 select OF_EARLY_FLATTREE
38 select PERF_USE_VMALLOC
39 select HAVE_DEBUG_STACKOVERFLOW
44 config TRACE_IRQFLAGS_SUPPORT
47 config LOCKDEP_SUPPORT
50 config SCHED_OMIT_FRAME_POINTER
56 config RWSEM_GENERIC_SPINLOCK
59 config ARCH_FLATMEM_ENABLE
68 config GENERIC_CALIBRATE_DELAY
71 config GENERIC_HWEIGHT
74 config STACKTRACE_SUPPORT
78 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
83 source "kernel/Kconfig.freezer"
85 menu "ARC Architecture Configuration"
87 menu "ARC Platform/SoC/Board"
89 source "arch/arc/plat-sim/Kconfig"
90 source "arch/arc/plat-tb10x/Kconfig"
91 source "arch/arc/plat-axs10x/Kconfig"
92 #New platform adds here
97 prompt "ARC Instruction Set"
103 The original ARC ISA of ARC600/700 cores
108 ISA for the Next Generation ARC-HS cores
112 menu "ARC CPU Configuration"
116 default ARC_CPU_770 if ISA_ARCOMPACT
117 default ARC_CPU_HS if ISA_ARCV2
125 Support for ARC750 core
131 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
132 This core has a bunch of cool new features:
133 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
134 Shared Address Spaces (for sharing TLB entires in MMU)
135 -Caches: New Prog Model, Region Flush
136 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
144 Support for ARC HS38x Cores based on ARCv2 ISA
145 The notable features are:
146 - SMP configurations of upto 4 core with coherency
147 - Optional L2 Cache and IO-Coherency
148 - Revised Interrupt Architecture (multiple priorites, reg banks,
149 auto stack switch, auto regfile save/restore)
150 - MMUv4 (PIPT dcache, Huge Pages)
152 * 64bit load/store: LDD, STD
153 * Hardware assisted divide/remainder: DIV, REM
154 * Function prologue/epilogue: ENTER_S, LEAVE_S
155 * IRQ enable/disable: CLRI, SETI
156 * pop count: FFS, FLS
157 * SETcc, BMSKN, XBFU...
161 config CPU_BIG_ENDIAN
162 bool "Enable Big Endian Mode"
165 Build kernel for Big Endian Mode of ARC CPU
168 bool "Symmetric Multi-Processing"
170 select ARC_HAS_COH_CACHES if ISA_ARCV2
171 select ARC_MCIP if ISA_ARCV2
173 This enables support for systems with more than one CPU.
177 config ARC_HAS_COH_CACHES
180 config ARC_HAS_REENTRANT_IRQ_LV2
184 bool "ARConnect Multicore IP (MCIP) Support "
187 This IP block enables SMP in ARC-HS38 cores.
188 It provides for cross-core interrupts, multi-core debug
189 hardware semaphores, shared memory,....
192 int "Maximum number of CPUs (2-4096)"
196 config ARC_SMP_HALT_ON_RESET
197 bool "Enable Halt-on-reset boot mode"
198 default y if ARC_UBOOT_SUPPORT
200 In SMP configuration cores can be configured as Halt-on-reset
201 or they could all start at same time. For Halt-on-reset, non
202 masters are parked until Master kicks them so they can start of
203 at designated entry point. For other case, all jump to common
204 entry point and spin wait for Master's signal.
209 bool "Enable Cache Support"
211 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
212 depends on !SMP || ARC_HAS_COH_CACHES
216 config ARC_CACHE_LINE_SHIFT
217 int "Cache Line Length (as power of 2)"
221 Starting with ARC700 4.9, Cache line length is configurable,
222 This option specifies "N", with Line-len = 2 power N
223 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
224 Linux only supports same line lengths for I and D caches.
226 config ARC_HAS_ICACHE
227 bool "Use Instruction Cache"
230 config ARC_HAS_DCACHE
231 bool "Use Data Cache"
234 config ARC_CACHE_PAGES
235 bool "Per Page Cache Control"
237 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
239 This can be used to over-ride the global I/D Cache Enable on a
240 per-page basis (but only for pages accessed via MMU such as
241 Kernel Virtual address or User Virtual Address)
242 TLB entries have a per-page Cache Enable Bit.
243 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
244 Global DISABLE + Per Page ENABLE won't work
246 config ARC_CACHE_VIPT_ALIASING
247 bool "Support VIPT Aliasing D$"
248 depends on ARC_HAS_DCACHE && ISA_ARCOMPACT
256 Single Cycle RAMS to store Fast Path Code
260 int "ICCM Size in KB"
262 depends on ARC_HAS_ICCM
267 Single Cycle RAMS to store Fast Path Data
271 int "DCCM Size in KB"
273 depends on ARC_HAS_DCCM
276 hex "DCCM map address"
278 depends on ARC_HAS_DCCM
282 default ARC_MMU_V3 if ARC_CPU_770
283 default ARC_MMU_V2 if ARC_CPU_750D
284 default ARC_MMU_V4 if ARC_CPU_HS
296 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
297 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
301 depends on ARC_CPU_770
303 Introduced with ARC700 4.10: New Features
304 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
305 Shared Address Spaces (SASID)
317 prompt "MMU Page Size"
318 default ARC_PAGE_SIZE_8K
320 config ARC_PAGE_SIZE_8K
323 Choose between 8k vs 16k
325 config ARC_PAGE_SIZE_16K
327 depends on ARC_MMU_V3 || ARC_MMU_V4
329 config ARC_PAGE_SIZE_4K
331 depends on ARC_MMU_V3 || ARC_MMU_V4
336 prompt "MMU Super Page Size"
337 depends on ISA_ARCV2 && TRANSPARENT_HUGEPAGE
338 default ARC_HUGEPAGE_2M
340 config ARC_HUGEPAGE_2M
343 config ARC_HUGEPAGE_16M
350 config ARC_COMPACT_IRQ_LEVELS
351 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
353 # Timer HAS to be high priority, for any other high priority config
355 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
356 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
358 if ARC_COMPACT_IRQ_LEVELS
369 endif #ARC_COMPACT_IRQ_LEVELS
371 config ARC_FPU_SAVE_RESTORE
372 bool "Enable FPU state persistence across context switch"
375 Double Precision Floating Point unit had dedictaed regs which
376 need to be saved/restored across context-switch.
377 Note that ARC FPU is overly simplistic, unlike say x86, which has
378 hardware pieces to allow software to conditionally save/restore,
379 based on actual usage of FPU by a task. Thus our implemn does
380 this for all tasks in system.
388 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
390 depends on !ARC_CANT_LLSC
392 config ARC_STAR_9000923308
393 bool "Workaround for llock/scond livelock"
395 depends on ISA_ARCV2 && SMP && ARC_HAS_LLSC
398 bool "Insn: SWAPE (endian-swap)"
404 bool "Insn: 64bit LDD/STD"
406 Enable gcc to generate 64-bit load/store instructions
407 ISA mandates even/odd registers to allow encoding of two
408 dest operands with 2 possible source operands.
411 config ARC_HAS_DIV_REM
412 bool "Insn: div, divu, rem, remu"
416 bool "Local 64-bit r/o cycle counter"
421 bool "SMP synchronized 64-bit cycle counter"
425 config ARC_NUMBER_OF_INTERRUPTS
426 int "Number of interrupts"
430 This defines the number of interrupts on the ARCv2HS core.
431 It affects the size of vector table.
432 The initial 8 IRQs are fixed (Timer, ICI etc) and although configurable
433 in hardware, it keep things simple for Linux to assume they are always
438 endmenu # "ARC CPU Configuration"
440 config LINUX_LINK_BASE
441 hex "Linux Link Address"
444 ARC700 divides the 32 bit phy address space into two equal halves
445 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
446 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
447 Typically Linux kernel is linked at the start of untransalted addr,
448 hence the default value of 0x8zs.
449 However some customers have peripherals mapped at this addr, so
450 Linux needs to be scooted a bit.
451 If you don't know what the above means, leave this setting alone.
452 This needs to match memory start address specified in Device Tree
455 bool "High Memory Support"
457 With ARC 2G:2G address split, only upper 2G is directly addressable by
458 kernel. Enable this to potentially allow access to rest of 2G and PAE
462 bool "Support for the 40-bit Physical Address Extension"
466 Enable access to physical memory beyond 4G, only supported on
467 ARC cores with 40 bit Physical Addressing support
469 config ARCH_PHYS_ADDR_T_64BIT
470 def_bool ARC_HAS_PAE40
472 config ARCH_DMA_ADDR_T_64BIT
475 config ARC_PLAT_NEEDS_PHYS_TO_DMA
478 config ARC_CURR_IN_REG
479 bool "Dedicate Register r25 for current_task pointer"
482 This reserved Register R25 to point to Current Task in
483 kernel mode. This saves memory access for each such access
486 config ARC_EMUL_UNALIGNED
487 bool "Emulate unaligned memory access (userspace only)"
489 select SYSCTL_ARCH_UNALIGN_NO_WARN
490 select SYSCTL_ARCH_UNALIGN_ALLOW
491 depends on ISA_ARCOMPACT
493 This enables misaligned 16 & 32 bit memory access from user space.
494 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
495 potential bugs in code
498 int "Timer Frequency"
501 config ARC_METAWARE_HLINK
502 bool "Support for Metaware debugger assisted Host access"
505 This options allows a Linux userland apps to directly access
506 host file system (open/creat/read/write etc) with help from
507 Metaware Debugger. This can come in handy for Linux-host communication
508 when there is no real usable peripheral such as EMAC.
516 config ARC_DW2_UNWIND
517 bool "Enable DWARF specific kernel stack unwind"
521 Compiles the kernel with DWARF unwind information and can be used
522 to get stack backtraces.
524 If you say Y here the resulting kernel image will be slightly larger
525 but not slower, and it will give very useful debugging information.
526 If you don't debug the kernel, you can say N, but we may not be able
527 to solve problems without frame unwind information
529 config ARC_DBG_TLB_PARANOIA
530 bool "Paranoia Checks in Low Level TLB Handlers"
533 config ARC_DBG_TLB_MISS_COUNT
534 bool "Profile TLB Misses"
538 Counts number of I and D TLB Misses and exports them via Debugfs
539 The counters can be cleared via Debugfs as well
543 config ARC_UBOOT_SUPPORT
544 bool "Support uboot arg Handling"
547 ARC Linux by default checks for uboot provided args as pointers to
548 external cmdline or DTB. This however breaks in absence of uboot,
549 when booting from Metaware debugger directly, as the registers are
550 not zeroed out on reset by mdb and/or ARCv2 based cores. The bogus
551 registers look like uboot args to kernel which then chokes.
552 So only enable the uboot arg checking/processing if users are sure
553 of uboot being in play.
555 config ARC_BUILTIN_DTB_NAME
556 string "Built in DTB"
558 Set the name of the DTB to embed in the vmlinux binary
559 Leaving it blank selects the minimal "skeleton" dtb
561 source "kernel/Kconfig.preempt"
563 menu "Executable file formats"
564 source "fs/Kconfig.binfmt"
567 endmenu # "ARC Architecture Configuration"
571 config FORCE_MAX_ZONEORDER
572 int "Maximum zone order"
573 default "12" if ARC_HUGEPAGE_16M
577 source "drivers/Kconfig"
582 bool "PCI support" if MIGHT_HAVE_PCI
584 PCI is the name of a bus system, i.e., the way the CPU talks to
585 the other stuff inside your box. Find out if your board/platform
588 Note: PCIe support for Synopsys Device will be available only
589 when HAPS DX is configured with PCIe RC bitmap. If you have PCI,
595 source "drivers/pci/Kconfig"
600 source "arch/arc/Kconfig.debug"
601 source "security/Kconfig"
602 source "crypto/Kconfig"
604 source "kernel/power/Kconfig"