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_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC
17 select ARCH_32BIT_OFF_T
18 select BUILDTIME_TABLE_SORT
19 select CLONE_BACKWARDS
21 select DMA_DIRECT_REMAP
22 select GENERIC_ATOMIC64 if !ISA_ARCV2 || !(ARC_HAS_LL64 && ARC_HAS_LLSC)
23 # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
24 select GENERIC_IRQ_SHOW
25 select GENERIC_PCI_IOMAP
26 select GENERIC_PENDING_IRQ if SMP
27 select GENERIC_SCHED_CLOCK
28 select GENERIC_SMP_IDLE_THREAD
30 select HAVE_ARCH_TRACEHOOK
31 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if ARC_MMU_V4
32 select HAVE_DEBUG_STACKOVERFLOW
33 select HAVE_DEBUG_KMEMLEAK
34 select HAVE_IOREMAP_PROT
35 select HAVE_KERNEL_GZIP
36 select HAVE_KERNEL_LZMA
38 select HAVE_KRETPROBES
39 select HAVE_REGS_AND_STACK_ACCESS_API
40 select HAVE_MOD_ARCH_SPECIFIC
41 select HAVE_PERF_EVENTS
42 select HAVE_SYSCALL_TRACEPOINTS
44 select MODULES_USE_ELF_RELA
46 select OF_EARLY_FLATTREE
47 select PCI_SYSCALL if PCI
48 select PERF_USE_VMALLOC if ARC_CACHE_VIPT_ALIASING
49 select HAVE_ARCH_JUMP_LABEL if ISA_ARCV2 && !CPU_ENDIAN_BE32
50 select TRACE_IRQFLAGS_SUPPORT
52 config LOCKDEP_SUPPORT
55 config SCHED_OMIT_FRAME_POINTER
61 config ARCH_FLATMEM_ENABLE
70 config GENERIC_CALIBRATE_DELAY
73 config GENERIC_HWEIGHT
76 config STACKTRACE_SUPPORT
80 menu "ARC Architecture Configuration"
82 menu "ARC Platform/SoC/Board"
84 source "arch/arc/plat-tb10x/Kconfig"
85 source "arch/arc/plat-axs10x/Kconfig"
86 source "arch/arc/plat-hsdk/Kconfig"
91 prompt "ARC Instruction Set"
96 select CPU_NO_EFFICIENT_FFS
98 The original ARC ISA of ARC600/700 cores
102 select ARC_TIMERS_64BIT
104 ISA for the Next Generation ARC-HS cores
108 menu "ARC CPU Configuration"
112 default ARC_CPU_770 if ISA_ARCOMPACT
113 default ARC_CPU_HS if ISA_ARCV2
117 depends on ISA_ARCOMPACT
120 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
121 This core has a bunch of cool new features:
122 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
123 Shared Address Spaces (for sharing TLB entries in MMU)
124 -Caches: New Prog Model, Region Flush
125 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
131 Support for ARC HS38x Cores based on ARCv2 ISA
132 The notable features are:
133 - SMP configurations of up to 4 cores with coherency
134 - Optional L2 Cache and IO-Coherency
135 - Revised Interrupt Architecture (multiple priorites, reg banks,
136 auto stack switch, auto regfile save/restore)
137 - MMUv4 (PIPT dcache, Huge Pages)
139 * 64bit load/store: LDD, STD
140 * Hardware assisted divide/remainder: DIV, REM
141 * Function prologue/epilogue: ENTER_S, LEAVE_S
142 * IRQ enable/disable: CLRI, SETI
143 * pop count: FFS, FLS
144 * SETcc, BMSKN, XBFU...
149 string "Override default -mcpu compiler flag"
152 Override default -mcpu=xxx compiler flag (which is set depending on
153 the ISA version) with the specified value.
154 NOTE: If specified flag isn't supported by current compiler the
155 ISA default value will be used as a fallback.
157 config CPU_BIG_ENDIAN
158 bool "Enable Big Endian Mode"
160 Build kernel for Big Endian Mode of ARC CPU
163 bool "Symmetric Multi-Processing"
164 select ARC_MCIP if ISA_ARCV2
166 This enables support for systems with more than one CPU.
171 int "Maximum number of CPUs (2-4096)"
175 config ARC_SMP_HALT_ON_RESET
176 bool "Enable Halt-on-reset boot mode"
178 In SMP configuration cores can be configured as Halt-on-reset
179 or they could all start at same time. For Halt-on-reset, non
180 masters are parked until Master kicks them so they can start off
181 at designated entry point. For other case, all jump to common
182 entry point and spin wait for Master's signal.
187 bool "ARConnect Multicore IP (MCIP) Support "
191 This IP block enables SMP in ARC-HS38 cores.
192 It provides for cross-core interrupts, multi-core debug
193 hardware semaphores, shared memory,....
196 bool "Enable Cache Support"
201 config ARC_CACHE_LINE_SHIFT
202 int "Cache Line Length (as power of 2)"
206 Starting with ARC700 4.9, Cache line length is configurable,
207 This option specifies "N", with Line-len = 2 power N
208 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
209 Linux only supports same line lengths for I and D caches.
211 config ARC_HAS_ICACHE
212 bool "Use Instruction Cache"
215 config ARC_HAS_DCACHE
216 bool "Use Data Cache"
219 config ARC_CACHE_PAGES
220 bool "Per Page Cache Control"
222 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
224 This can be used to over-ride the global I/D Cache Enable on a
225 per-page basis (but only for pages accessed via MMU such as
226 Kernel Virtual address or User Virtual Address)
227 TLB entries have a per-page Cache Enable Bit.
228 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
229 Global DISABLE + Per Page ENABLE won't work
231 config ARC_CACHE_VIPT_ALIASING
232 bool "Support VIPT Aliasing D$"
233 depends on ARC_HAS_DCACHE && ISA_ARCOMPACT
240 Single Cycle RAMS to store Fast Path Code
243 int "ICCM Size in KB"
245 depends on ARC_HAS_ICCM
250 Single Cycle RAMS to store Fast Path Data
253 int "DCCM Size in KB"
255 depends on ARC_HAS_DCCM
258 hex "DCCM map address"
260 depends on ARC_HAS_DCCM
264 default ARC_MMU_V3 if ISA_ARCOMPACT
265 default ARC_MMU_V4 if ISA_ARCV2
269 depends on ISA_ARCOMPACT
271 Introduced with ARC700 4.10: New Features
272 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
273 Shared Address Spaces (SASID)
283 prompt "MMU Page Size"
284 default ARC_PAGE_SIZE_8K
286 config ARC_PAGE_SIZE_8K
289 Choose between 8k vs 16k
291 config ARC_PAGE_SIZE_16K
294 config ARC_PAGE_SIZE_4K
296 depends on ARC_MMU_V3 || ARC_MMU_V4
301 prompt "MMU Super Page Size"
302 depends on ISA_ARCV2 && TRANSPARENT_HUGEPAGE
303 default ARC_HUGEPAGE_2M
305 config ARC_HUGEPAGE_2M
308 config ARC_HUGEPAGE_16M
313 config PGTABLE_LEVELS
314 int "Number of Page table levels"
317 config ARC_COMPACT_IRQ_LEVELS
318 depends on ISA_ARCOMPACT
319 bool "Setup Timer IRQ as high Priority"
320 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
323 config ARC_FPU_SAVE_RESTORE
324 bool "Enable FPU state persistence across context switch"
326 ARCompact FPU has internal registers to assist with Double precision
327 Floating Point operations. There are control and stauts registers
328 for floating point exceptions and rounding modes. These are
329 preserved across task context switch when enabled.
335 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
337 depends on !ARC_CANT_LLSC
340 bool "Insn: SWAPE (endian-swap)"
345 config ARC_USE_UNALIGNED_MEM_ACCESS
346 bool "Enable unaligned access in HW"
348 select HAVE_EFFICIENT_UNALIGNED_ACCESS
350 The ARC HS architecture supports unaligned memory access
351 which is disabled by default. Enable unaligned access in
352 hardware and use software to use it
355 bool "Insn: 64bit LDD/STD"
357 Enable gcc to generate 64-bit load/store instructions
358 ISA mandates even/odd registers to allow encoding of two
359 dest operands with 2 possible source operands.
362 config ARC_HAS_DIV_REM
363 bool "Insn: div, divu, rem, remu"
366 config ARC_HAS_ACCL_REGS
367 bool "Reg Pair ACCL:ACCH (FPU and/or MPY > 6 and/or DSP)"
370 Depending on the configuration, CPU can contain accumulator reg-pair
371 (also referred to as r58:r59). These can also be used by gcc as GPR so
372 kernel needs to save/restore per process
374 config ARC_DSP_HANDLED
377 config ARC_DSP_SAVE_RESTORE_REGS
384 Depending on the configuration, CPU can contain DSP registers
385 (ACC0_GLO, ACC0_GHI, DSP_BFLY0, DSP_CTRL, DSP_FFT_CTRL).
386 Below are options describing how to handle these registers in
387 interrupt entry / exit and in context switch.
390 bool "No DSP extension presence in HW"
392 No DSP extension presence in HW
394 config ARC_DSP_KERNEL
395 bool "DSP extension in HW, no support for userspace"
396 select ARC_HAS_ACCL_REGS
397 select ARC_DSP_HANDLED
399 DSP extension presence in HW, no support for DSP-enabled userspace
400 applications. We don't save / restore DSP registers and only do
401 some minimal preparations so userspace won't be able to break kernel
403 config ARC_DSP_USERSPACE
404 bool "Support DSP for userspace apps"
405 select ARC_HAS_ACCL_REGS
406 select ARC_DSP_HANDLED
407 select ARC_DSP_SAVE_RESTORE_REGS
409 DSP extension presence in HW, support save / restore DSP registers to
410 run DSP-enabled userspace applications
412 config ARC_DSP_AGU_USERSPACE
413 bool "Support DSP with AGU for userspace apps"
414 select ARC_HAS_ACCL_REGS
415 select ARC_DSP_HANDLED
416 select ARC_DSP_SAVE_RESTORE_REGS
418 DSP and AGU extensions presence in HW, support save / restore DSP
419 and AGU registers to run DSP-enabled userspace applications
422 config ARC_IRQ_NO_AUTOSAVE
423 bool "Disable hardware autosave regfile on interrupts"
426 On HS cores, taken interrupt auto saves the regfile on stack.
427 This is programmable and can be optionally disabled in which case
428 software INTERRUPT_PROLOGUE/EPILGUE do the needed work
430 config ARC_LPB_DISABLE
431 bool "Disable loop buffer (LPB)"
433 On HS cores, loop buffer (LPB) is programmable in runtime and can
434 be optionally disabled.
438 endmenu # "ARC CPU Configuration"
440 config LINUX_LINK_BASE
441 hex "Kernel 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
454 config LINUX_RAM_BASE
455 hex "RAM base address"
456 default LINUX_LINK_BASE
458 By default Linux is linked at base of RAM. However in some special
459 cases (such as HSDK), Linux can't be linked at start of DDR, hence
463 bool "High Memory Support"
464 select HAVE_ARCH_PFN_VALID
467 With ARC 2G:2G address split, only upper 2G is directly addressable by
468 kernel. Enable this to potentially allow access to rest of 2G and PAE
472 bool "Support for the 40-bit Physical Address Extension"
475 select PHYS_ADDR_T_64BIT
477 Enable access to physical memory beyond 4G, only supported on
478 ARC cores with 40 bit Physical Addressing support
480 config ARC_KVADDR_SIZE
481 int "Kernel Virtual Address Space size (MB)"
485 The kernel address space is carved out of 256MB of translated address
486 space for catering to vmalloc, modules, pkmap, fixmap. This however may
487 not suffice vmalloc requirements of a 4K CPU EZChip system. So allow
488 this to be stretched to 512 MB (by extending into the reserved
491 config ARC_CURR_IN_REG
492 bool "Dedicate Register r25 for current_task pointer"
495 This reserved Register R25 to point to Current Task in
496 kernel mode. This saves memory access for each such access
499 config ARC_EMUL_UNALIGNED
500 bool "Emulate unaligned memory access (userspace only)"
501 select SYSCTL_ARCH_UNALIGN_NO_WARN
502 select SYSCTL_ARCH_UNALIGN_ALLOW
503 depends on ISA_ARCOMPACT
505 This enables misaligned 16 & 32 bit memory access from user space.
506 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
507 potential bugs in code
510 int "Timer Frequency"
513 config ARC_METAWARE_HLINK
514 bool "Support for Metaware debugger assisted Host access"
516 This options allows a Linux userland apps to directly access
517 host file system (open/creat/read/write etc) with help from
518 Metaware Debugger. This can come in handy for Linux-host communication
519 when there is no real usable peripheral such as EMAC.
527 config ARC_DW2_UNWIND
528 bool "Enable DWARF specific kernel stack unwind"
532 Compiles the kernel with DWARF unwind information and can be used
533 to get stack backtraces.
535 If you say Y here the resulting kernel image will be slightly larger
536 but not slower, and it will give very useful debugging information.
537 If you don't debug the kernel, you can say N, but we may not be able
538 to solve problems without frame unwind information
540 config ARC_DBG_JUMP_LABEL
541 bool "Paranoid checks in Static Keys (jump labels) code"
542 depends on JUMP_LABEL
543 default y if STATIC_KEYS_SELFTEST
545 Enable paranoid checks and self-test of both ARC-specific and generic
546 part of static keys (jump labels) related code.
549 config ARC_BUILTIN_DTB_NAME
550 string "Built in DTB"
552 Set the name of the DTB to embed in the vmlinux binary
553 Leaving it blank selects the minimal "skeleton" dtb
555 endmenu # "ARC Architecture Configuration"
557 config ARCH_FORCE_MAX_ORDER
558 int "Maximum zone order"
559 default "12" if ARC_HUGEPAGE_16M
562 source "kernel/power/Kconfig"