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linux-next/arch/arc/Kconfig
Vineet Gupta 4102b53392 ARC: [mm] Aliasing VIPT dcache support 2/4 
This is the meat of the series which prevents any dcache alias creation
by always keeping the U and K mapping of a page congruent.
If a mapping already exists, and other tries to access the page, prev
one is flushed to physical page (wback+inv)

Essentially flush_dcache_page()/copy_user_highpage() create K-mapping
of a page, but try to defer flushing, unless U-mapping exist.
When page is actually mapped to userspace, update_mmu_cache() flushes
the K-mapping (in certain cases this can be optimised out)

Additonally flush_cache_mm(), flush_cache_range(), flush_cache_page()
handle the puring of stale userspace mappings on exit/munmap...

flush_anon_page() handles the existing U-mapping for anon page before
kernel reads it via the GUP path.

Note that while not complete, this is enough to boot a simple
dynamically linked Busybox based rootfs

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-05-09 21:59:46 +05:30

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#
# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
config ARC
def_bool y
select CLONE_BACKWARDS
# ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
select DEVTMPFS if !INITRAMFS_SOURCE=""
select GENERIC_ATOMIC64
select GENERIC_CLOCKEVENTS
select GENERIC_FIND_FIRST_BIT
# for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
select GENERIC_IRQ_SHOW
select GENERIC_PENDING_IRQ if SMP
select GENERIC_SMP_IDLE_THREAD
select HAVE_ARCH_KGDB
select HAVE_ARCH_TRACEHOOK
select HAVE_GENERIC_HARDIRQS
select HAVE_IOREMAP_PROT
select HAVE_KPROBES
select HAVE_KRETPROBES
select HAVE_MEMBLOCK
select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
select HAVE_OPROFILE
select HAVE_PERF_EVENTS
select IRQ_DOMAIN
select MODULES_USE_ELF_RELA
select NO_BOOTMEM
select OF
select OF_EARLY_FLATTREE
select PERF_USE_VMALLOC
config SCHED_OMIT_FRAME_POINTER
def_bool y
config GENERIC_CSUM
def_bool y
config RWSEM_GENERIC_SPINLOCK
def_bool y
config ARCH_FLATMEM_ENABLE
def_bool y
config MMU
def_bool y
config NO_IOPORT
def_bool y
config GENERIC_CALIBRATE_DELAY
def_bool y
config GENERIC_HWEIGHT
def_bool y
config STACKTRACE_SUPPORT
def_bool y
select STACKTRACE
config HAVE_LATENCYTOP_SUPPORT
def_bool y
config NO_DMA
def_bool n
source "init/Kconfig"
source "kernel/Kconfig.freezer"
menu "ARC Architecture Configuration"
menu "ARC Platform/SoC/Board"
source "arch/arc/plat-arcfpga/Kconfig"
source "arch/arc/plat-tb10x/Kconfig"
#New platform adds here
endmenu
menu "ARC CPU Configuration"
choice
prompt "ARC Core"
default ARC_CPU_770
config ARC_CPU_750D
bool "ARC750D"
help
Support for ARC750 core
config ARC_CPU_770
bool "ARC770"
select ARC_CPU_REL_4_10
help
Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
This core has a bunch of cool new features:
-MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
Shared Address Spaces (for sharing TLB entires in MMU)
-Caches: New Prog Model, Region Flush
-Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
endchoice
config CPU_BIG_ENDIAN
bool "Enable Big Endian Mode"
default n
help
Build kernel for Big Endian Mode of ARC CPU
# If a platform can't work with 0x8000_0000 based dma_addr_t
config ARC_PLAT_NEEDS_CPU_TO_DMA
bool
config SMP
bool "Symmetric Multi-Processing (Incomplete)"
default n
select USE_GENERIC_SMP_HELPERS
help
This enables support for systems with more than one CPU. If you have
a system with only one CPU, like most personal computers, say N. If
you have a system with more than one CPU, say Y.
if SMP
config ARC_HAS_COH_CACHES
def_bool n
config ARC_HAS_COH_RTSC
def_bool n
config ARC_HAS_REENTRANT_IRQ_LV2
def_bool n
endif
config NR_CPUS
int "Maximum number of CPUs (2-32)"
range 2 32
depends on SMP
default "2"
menuconfig ARC_CACHE
bool "Enable Cache Support"
default y
# if SMP, cache enabled ONLY if ARC implementation has cache coherency
depends on !SMP || ARC_HAS_COH_CACHES
if ARC_CACHE
config ARC_CACHE_LINE_SHIFT
int "Cache Line Length (as power of 2)"
range 5 7
default "6"
help
Starting with ARC700 4.9, Cache line length is configurable,
This option specifies "N", with Line-len = 2 power N
So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
Linux only supports same line lengths for I and D caches.
config ARC_HAS_ICACHE
bool "Use Instruction Cache"
default y
config ARC_HAS_DCACHE
bool "Use Data Cache"
default y
config ARC_CACHE_PAGES
bool "Per Page Cache Control"
default y
depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
help
This can be used to over-ride the global I/D Cache Enable on a
per-page basis (but only for pages accessed via MMU such as
Kernel Virtual address or User Virtual Address)
TLB entries have a per-page Cache Enable Bit.
Note that Global I/D ENABLE + Per Page DISABLE works but corollary
Global DISABLE + Per Page ENABLE won't work
config ARC_CACHE_VIPT_ALIASING
bool "Support VIPT Aliasing D$"
default n
endif #ARC_CACHE
config ARC_HAS_ICCM
bool "Use ICCM"
help
Single Cycle RAMS to store Fast Path Code
default n
config ARC_ICCM_SZ
int "ICCM Size in KB"
default "64"
depends on ARC_HAS_ICCM
config ARC_HAS_DCCM
bool "Use DCCM"
help
Single Cycle RAMS to store Fast Path Data
default n
config ARC_DCCM_SZ
int "DCCM Size in KB"
default "64"
depends on ARC_HAS_DCCM
config ARC_DCCM_BASE
hex "DCCM map address"
default "0xA0000000"
depends on ARC_HAS_DCCM
config ARC_HAS_HW_MPY
bool "Use Hardware Multiplier (Normal or Faster XMAC)"
default y
help
Influences how gcc generates code for MPY operations.
If enabled, MPYxx insns are generated, provided by Standard/XMAC
Multipler. Otherwise software multipy lib is used
choice
prompt "ARC700 MMU Version"
default ARC_MMU_V3 if ARC_CPU_770
default ARC_MMU_V2 if ARC_CPU_750D
config ARC_MMU_V1
bool "MMU v1"
help
Orig ARC700 MMU
config ARC_MMU_V2
bool "MMU v2"
help
Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
when 2 D-TLB and 1 I-TLB entries index into same 2way set.
config ARC_MMU_V3
bool "MMU v3"
depends on ARC_CPU_770
help
Introduced with ARC700 4.10: New Features
Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
Shared Address Spaces (SASID)
endchoice
choice
prompt "MMU Page Size"
default ARC_PAGE_SIZE_8K
config ARC_PAGE_SIZE_8K
bool "8KB"
help
Choose between 8k vs 16k
config ARC_PAGE_SIZE_16K
bool "16KB"
depends on ARC_MMU_V3
config ARC_PAGE_SIZE_4K
bool "4KB"
depends on ARC_MMU_V3
endchoice
config ARC_COMPACT_IRQ_LEVELS
bool "ARCompact IRQ Priorities: High(2)/Low(1)"
default n
# Timer HAS to be high priority, for any other high priority config
select ARC_IRQ3_LV2
# if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
if ARC_COMPACT_IRQ_LEVELS
config ARC_IRQ3_LV2
bool
config ARC_IRQ5_LV2
bool
config ARC_IRQ6_LV2
bool
endif
config ARC_FPU_SAVE_RESTORE
bool "Enable FPU state persistence across context switch"
default n
help
Double Precision Floating Point unit had dedictaed regs which
need to be saved/restored across context-switch.
Note that ARC FPU is overly simplistic, unlike say x86, which has
hardware pieces to allow software to conditionally save/restore,
based on actual usage of FPU by a task. Thus our implemn does
this for all tasks in system.
config ARC_CANT_LLSC
def_bool n
menuconfig ARC_CPU_REL_4_10
bool "Enable support for Rel 4.10 features"
default n
help
-ARC770 (and dependent features) enabled
-ARC750 also shares some of the new features with 770
config ARC_HAS_LLSC
bool "Insn: LLOCK/SCOND (efficient atomic ops)"
default y
depends on ARC_CPU_770 && !ARC_CANT_LLSC
config ARC_HAS_SWAPE
bool "Insn: SWAPE (endian-swap)"
default y
depends on ARC_CPU_REL_4_10
config ARC_HAS_RTSC
bool "Insn: RTSC (64-bit r/o cycle counter)"
default y
depends on ARC_CPU_REL_4_10
# if SMP, enable RTSC only if counter is coherent across cores
depends on !SMP || ARC_HAS_COH_RTSC
endmenu # "ARC CPU Configuration"
config LINUX_LINK_BASE
hex "Linux Link Address"
default "0x80000000"
help
ARC700 divides the 32 bit phy address space into two equal halves
-Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
-Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
Typically Linux kernel is linked at the start of untransalted addr,
hence the default value of 0x8zs.
However some customers have peripherals mapped at this addr, so
Linux needs to be scooted a bit.
If you don't know what the above means, leave this setting alone.
config ARC_CURR_IN_REG
bool "Dedicate Register r25 for current_task pointer"
default y
help
This reserved Register R25 to point to Current Task in
kernel mode. This saves memory access for each such access
config ARC_MISALIGN_ACCESS
bool "Emulate unaligned memory access (userspace only)"
default N
select SYSCTL_ARCH_UNALIGN_NO_WARN
select SYSCTL_ARCH_UNALIGN_ALLOW
help
This enables misaligned 16 & 32 bit memory access from user space.
Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
potential bugs in code
config ARC_STACK_NONEXEC
bool "Make stack non-executable"
default n
help
To disable the execute permissions of stack/heap of processes
which are enabled by default.
config HZ
int "Timer Frequency"
default 100
config ARC_METAWARE_HLINK
bool "Support for Metaware debugger assisted Host access"
default n
help
This options allows a Linux userland apps to directly access
host file system (open/creat/read/write etc) with help from
Metaware Debugger. This can come in handy for Linux-host communication
when there is no real usable peripheral such as EMAC.
menuconfig ARC_DBG
bool "ARC debugging"
default y
config ARC_DW2_UNWIND
bool "Enable DWARF specific kernel stack unwind"
depends on ARC_DBG
default y
select KALLSYMS
help
Compiles the kernel with DWARF unwind information and can be used
to get stack backtraces.
If you say Y here the resulting kernel image will be slightly larger
but not slower, and it will give very useful debugging information.
If you don't debug the kernel, you can say N, but we may not be able
to solve problems without frame unwind information
config ARC_DBG_TLB_PARANOIA
bool "Paranoia Checks in Low Level TLB Handlers"
depends on ARC_DBG
default n
config ARC_DBG_TLB_MISS_COUNT
bool "Profile TLB Misses"
default n
select DEBUG_FS
depends on ARC_DBG
help
Counts number of I and D TLB Misses and exports them via Debugfs
The counters can be cleared via Debugfs as well
config CMDLINE_UBOOT
bool "Support U-boot kernel command line passing"
default n
help
If you are using U-boot (www.denx.de) and wish to pass the kernel
command line from the U-boot environment to the Linux kernel then
switch this option on.
ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
to it. kernel startup code will append this to DeviceTree
/bootargs provided cmdline args.
config ARC_BUILTIN_DTB_NAME
string "Built in DTB"
help
Set the name of the DTB to embed in the vmlinux binary
Leaving it blank selects the minimal "skeleton" dtb
source "kernel/Kconfig.preempt"
menu "Executable file formats"
source "fs/Kconfig.binfmt"
endmenu
endmenu # "ARC Architecture Configuration"
source "mm/Kconfig"
source "net/Kconfig"
source "drivers/Kconfig"
source "fs/Kconfig"
source "arch/arc/Kconfig.debug"
source "security/Kconfig"
source "crypto/Kconfig"
source "lib/Kconfig"
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