1 # SPDX-License-Identifier: GPL-2.0-only
3 # Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
9 select ARCH_HAS_CACHE_LINE_SIZE
10 select ARCH_HAS_DEBUG_VM_PGTABLE
11 select ARCH_HAS_DMA_PREP_COHERENT
12 select ARCH_HAS_PTE_SPECIAL
13 select ARCH_HAS_SETUP_DMA_OPS
14 select ARCH_HAS_SYNC_DMA_FOR_CPU
15 select ARCH_HAS_SYNC_DMA_FOR_DEVICE
16 select ARCH_NEED_CMPXCHG_1_EMU
17 select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC
18 select ARCH_32BIT_OFF_T
19 select BUILDTIME_TABLE_SORT
20 select CLONE_BACKWARDS
22 select DMA_DIRECT_REMAP
23 select GENERIC_ATOMIC64 if !ISA_ARCV2 || !(ARC_HAS_LL64 && ARC_HAS_LLSC)
24 # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
25 select GENERIC_IRQ_SHOW
26 select GENERIC_PCI_IOMAP
27 select GENERIC_PENDING_IRQ if SMP
28 select GENERIC_SCHED_CLOCK
29 select GENERIC_SMP_IDLE_THREAD
30 select GENERIC_IOREMAP
31 select GENERIC_STRNCPY_FROM_USER if MMU
32 select GENERIC_STRNLEN_USER if MMU
34 select HAVE_ARCH_TRACEHOOK
35 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if ARC_MMU_V4
36 select HAVE_DEBUG_STACKOVERFLOW
37 select HAVE_DEBUG_KMEMLEAK
38 select HAVE_IOREMAP_PROT
39 select HAVE_KERNEL_GZIP
40 select HAVE_KERNEL_LZMA
42 select HAVE_KRETPROBES
43 select HAVE_REGS_AND_STACK_ACCESS_API
44 select HAVE_MOD_ARCH_SPECIFIC
45 select HAVE_PERF_EVENTS
46 select HAVE_SYSCALL_TRACEPOINTS
48 select LOCK_MM_AND_FIND_VMA
49 select MODULES_USE_ELF_RELA
51 select OF_EARLY_FLATTREE
52 select PCI_SYSCALL if PCI
53 select HAVE_ARCH_JUMP_LABEL if ISA_ARCV2 && !CPU_ENDIAN_BE32
54 select TRACE_IRQFLAGS_SUPPORT
55 select HAVE_EBPF_JIT if ISA_ARCV2
57 config LOCKDEP_SUPPORT
60 config SCHED_OMIT_FRAME_POINTER
66 config ARCH_FLATMEM_ENABLE
75 config GENERIC_CALIBRATE_DELAY
78 config GENERIC_HWEIGHT
81 config STACKTRACE_SUPPORT
85 menu "ARC Architecture Configuration"
87 menu "ARC Platform/SoC/Board"
89 source "arch/arc/plat-tb10x/Kconfig"
90 source "arch/arc/plat-axs10x/Kconfig"
91 source "arch/arc/plat-hsdk/Kconfig"
96 prompt "ARC Instruction Set"
101 select CPU_NO_EFFICIENT_FFS
103 The original ARC ISA of ARC600/700 cores
107 select ARC_TIMERS_64BIT
109 ISA for the Next Generation ARC-HS cores
113 menu "ARC CPU Configuration"
117 default ARC_CPU_770 if ISA_ARCOMPACT
118 default ARC_CPU_HS if ISA_ARCV2
122 depends on ISA_ARCOMPACT
125 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
126 This core has a bunch of cool new features:
127 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
128 Shared Address Spaces (for sharing TLB entries in MMU)
129 -Caches: New Prog Model, Region Flush
130 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
136 Support for ARC HS38x Cores based on ARCv2 ISA
137 The notable features are:
138 - SMP configurations of up to 4 cores with coherency
139 - Optional L2 Cache and IO-Coherency
140 - Revised Interrupt Architecture (multiple priorites, reg banks,
141 auto stack switch, auto regfile save/restore)
142 - MMUv4 (PIPT dcache, Huge Pages)
144 * 64bit load/store: LDD, STD
145 * Hardware assisted divide/remainder: DIV, REM
146 * Function prologue/epilogue: ENTER_S, LEAVE_S
147 * IRQ enable/disable: CLRI, SETI
148 * pop count: FFS, FLS
149 * SETcc, BMSKN, XBFU...
154 string "Override default -mcpu compiler flag"
157 Override default -mcpu=xxx compiler flag (which is set depending on
158 the ISA version) with the specified value.
159 NOTE: If specified flag isn't supported by current compiler the
160 ISA default value will be used as a fallback.
162 config CPU_BIG_ENDIAN
163 bool "Enable Big Endian Mode"
165 Build kernel for Big Endian Mode of ARC CPU
168 bool "Symmetric Multi-Processing"
169 select ARC_MCIP if ISA_ARCV2
171 This enables support for systems with more than one CPU.
176 int "Maximum number of CPUs (2-4096)"
180 config ARC_SMP_HALT_ON_RESET
181 bool "Enable Halt-on-reset boot mode"
183 In SMP configuration cores can be configured as Halt-on-reset
184 or they could all start at same time. For Halt-on-reset, non
185 masters are parked until Master kicks them so they can start off
186 at designated entry point. For other case, all jump to common
187 entry point and spin wait for Master's signal.
192 bool "ARConnect Multicore IP (MCIP) Support "
196 This IP block enables SMP in ARC-HS38 cores.
197 It provides for cross-core interrupts, multi-core debug
198 hardware semaphores, shared memory,....
201 bool "Enable Cache Support"
206 config ARC_CACHE_LINE_SHIFT
207 int "Cache Line Length (as power of 2)"
211 Starting with ARC700 4.9, Cache line length is configurable,
212 This option specifies "N", with Line-len = 2 power N
213 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
214 Linux only supports same line lengths for I and D caches.
216 config ARC_HAS_ICACHE
217 bool "Use Instruction Cache"
220 config ARC_HAS_DCACHE
221 bool "Use Data Cache"
224 config ARC_CACHE_PAGES
225 bool "Per Page Cache Control"
227 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
229 This can be used to over-ride the global I/D Cache Enable on a
230 per-page basis (but only for pages accessed via MMU such as
231 Kernel Virtual address or User Virtual Address)
232 TLB entries have a per-page Cache Enable Bit.
233 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
234 Global DISABLE + Per Page ENABLE won't work
241 Single Cycle RAMS to store Fast Path Code
244 int "ICCM Size in KB"
246 depends on ARC_HAS_ICCM
251 Single Cycle RAMS to store Fast Path Data
254 int "DCCM Size in KB"
256 depends on ARC_HAS_DCCM
259 hex "DCCM map address"
261 depends on ARC_HAS_DCCM
265 default ARC_MMU_V3 if ISA_ARCOMPACT
266 default ARC_MMU_V4 if ISA_ARCV2
270 depends on ISA_ARCOMPACT
272 Introduced with ARC700 4.10: New Features
273 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
274 Shared Address Spaces (SASID)
284 prompt "MMU Page Size"
285 default ARC_PAGE_SIZE_8K
287 config ARC_PAGE_SIZE_8K
289 select HAVE_PAGE_SIZE_8KB
291 Choose between 8k vs 16k
293 config ARC_PAGE_SIZE_16K
294 select HAVE_PAGE_SIZE_16KB
297 config ARC_PAGE_SIZE_4K
299 select HAVE_PAGE_SIZE_4KB
300 depends on ARC_MMU_V3 || ARC_MMU_V4
305 prompt "MMU Super Page Size"
306 depends on ISA_ARCV2 && TRANSPARENT_HUGEPAGE
307 default ARC_HUGEPAGE_2M
309 config ARC_HUGEPAGE_2M
312 config ARC_HUGEPAGE_16M
317 config PGTABLE_LEVELS
318 int "Number of Page table levels"
321 config ARC_COMPACT_IRQ_LEVELS
322 depends on ISA_ARCOMPACT
323 bool "Setup Timer IRQ as high Priority"
324 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
327 config ARC_FPU_SAVE_RESTORE
328 bool "Enable FPU state persistence across context switch"
330 ARCompact FPU has internal registers to assist with Double precision
331 Floating Point operations. There are control and stauts registers
332 for floating point exceptions and rounding modes. These are
333 preserved across task context switch when enabled.
339 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
341 depends on !ARC_CANT_LLSC
344 bool "Insn: SWAPE (endian-swap)"
349 config ARC_USE_UNALIGNED_MEM_ACCESS
350 bool "Enable unaligned access in HW"
352 select HAVE_EFFICIENT_UNALIGNED_ACCESS
354 The ARC HS architecture supports unaligned memory access
355 which is disabled by default. Enable unaligned access in
356 hardware and use software to use it
359 bool "Insn: 64bit LDD/STD"
361 Enable gcc to generate 64-bit load/store instructions
362 ISA mandates even/odd registers to allow encoding of two
363 dest operands with 2 possible source operands.
366 config ARC_HAS_DIV_REM
367 bool "Insn: div, divu, rem, remu"
370 config ARC_HAS_ACCL_REGS
371 bool "Reg Pair ACCL:ACCH (FPU and/or MPY > 6 and/or DSP)"
374 Depending on the configuration, CPU can contain accumulator reg-pair
375 (also referred to as r58:r59). These can also be used by gcc as GPR so
376 kernel needs to save/restore per process
378 config ARC_DSP_HANDLED
381 config ARC_DSP_SAVE_RESTORE_REGS
388 Depending on the configuration, CPU can contain DSP registers
389 (ACC0_GLO, ACC0_GHI, DSP_BFLY0, DSP_CTRL, DSP_FFT_CTRL).
390 Below are options describing how to handle these registers in
391 interrupt entry / exit and in context switch.
394 bool "No DSP extension presence in HW"
396 No DSP extension presence in HW
398 config ARC_DSP_KERNEL
399 bool "DSP extension in HW, no support for userspace"
400 select ARC_HAS_ACCL_REGS
401 select ARC_DSP_HANDLED
403 DSP extension presence in HW, no support for DSP-enabled userspace
404 applications. We don't save / restore DSP registers and only do
405 some minimal preparations so userspace won't be able to break kernel
407 config ARC_DSP_USERSPACE
408 bool "Support DSP for userspace apps"
409 select ARC_HAS_ACCL_REGS
410 select ARC_DSP_HANDLED
411 select ARC_DSP_SAVE_RESTORE_REGS
413 DSP extension presence in HW, support save / restore DSP registers to
414 run DSP-enabled userspace applications
416 config ARC_DSP_AGU_USERSPACE
417 bool "Support DSP with AGU for userspace apps"
418 select ARC_HAS_ACCL_REGS
419 select ARC_DSP_HANDLED
420 select ARC_DSP_SAVE_RESTORE_REGS
422 DSP and AGU extensions presence in HW, support save / restore DSP
423 and AGU registers to run DSP-enabled userspace applications
426 config ARC_IRQ_NO_AUTOSAVE
427 bool "Disable hardware autosave regfile on interrupts"
430 On HS cores, taken interrupt auto saves the regfile on stack.
431 This is programmable and can be optionally disabled in which case
432 software INTERRUPT_PROLOGUE/EPILGUE do the needed work
434 config ARC_LPB_DISABLE
435 bool "Disable loop buffer (LPB)"
437 On HS cores, loop buffer (LPB) is programmable in runtime and can
438 be optionally disabled.
442 endmenu # "ARC CPU Configuration"
444 config LINUX_LINK_BASE
445 hex "Kernel link address"
448 ARC700 divides the 32 bit phy address space into two equal halves
449 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
450 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
451 Typically Linux kernel is linked at the start of untransalted addr,
452 hence the default value of 0x8zs.
453 However some customers have peripherals mapped at this addr, so
454 Linux needs to be scooted a bit.
455 If you don't know what the above means, leave this setting alone.
456 This needs to match memory start address specified in Device Tree
458 config LINUX_RAM_BASE
459 hex "RAM base address"
460 default LINUX_LINK_BASE
462 By default Linux is linked at base of RAM. However in some special
463 cases (such as HSDK), Linux can't be linked at start of DDR, hence
467 bool "High Memory Support"
468 select HAVE_ARCH_PFN_VALID
471 With ARC 2G:2G address split, only upper 2G is directly addressable by
472 kernel. Enable this to potentially allow access to rest of 2G and PAE
476 bool "Support for the 40-bit Physical Address Extension"
479 select PHYS_ADDR_T_64BIT
481 Enable access to physical memory beyond 4G, only supported on
482 ARC cores with 40 bit Physical Addressing support
484 config ARC_KVADDR_SIZE
485 int "Kernel Virtual Address Space size (MB)"
489 The kernel address space is carved out of 256MB of translated address
490 space for catering to vmalloc, modules, pkmap, fixmap. This however may
491 not suffice vmalloc requirements of a 4K CPU EZChip system. So allow
492 this to be stretched to 512 MB (by extending into the reserved
495 config ARC_CURR_IN_REG
496 bool "cache current task pointer in gp"
499 This reserves gp register to point to Current Task in
500 kernel mode eliding memory access for each access
503 config ARC_EMUL_UNALIGNED
504 bool "Emulate unaligned memory access (userspace only)"
505 select SYSCTL_ARCH_UNALIGN_NO_WARN
506 select SYSCTL_ARCH_UNALIGN_ALLOW
507 depends on ISA_ARCOMPACT
509 This enables misaligned 16 & 32 bit memory access from user space.
510 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
511 potential bugs in code
514 int "Timer Frequency"
517 config ARC_METAWARE_HLINK
518 bool "Support for Metaware debugger assisted Host access"
520 This options allows a Linux userland apps to directly access
521 host file system (open/creat/read/write etc) with help from
522 Metaware Debugger. This can come in handy for Linux-host communication
523 when there is no real usable peripheral such as EMAC.
531 config ARC_DW2_UNWIND
532 bool "Enable DWARF specific kernel stack unwind"
536 Compiles the kernel with DWARF unwind information and can be used
537 to get stack backtraces.
539 If you say Y here the resulting kernel image will be slightly larger
540 but not slower, and it will give very useful debugging information.
541 If you don't debug the kernel, you can say N, but we may not be able
542 to solve problems without frame unwind information
544 config ARC_DBG_JUMP_LABEL
545 bool "Paranoid checks in Static Keys (jump labels) code"
546 depends on JUMP_LABEL
547 default y if STATIC_KEYS_SELFTEST
549 Enable paranoid checks and self-test of both ARC-specific and generic
550 part of static keys (jump labels) related code.
553 config ARC_BUILTIN_DTB_NAME
554 string "Built in DTB"
556 Set the name of the DTB to embed in the vmlinux binary
557 Leaving it blank selects the "nsim_700" dtb.
559 endmenu # "ARC Architecture Configuration"
561 config ARCH_FORCE_MAX_ORDER
562 int "Maximum zone order"
563 default "11" if ARC_HUGEPAGE_16M
566 source "kernel/power/Kconfig"