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3abc944802
1. For VM_EXEC based delayed dcache/icache flush, reduces the number of flushes. 2. Makes this security feature ON by default rather than OFF before. 3. Applications can use mprotect() to selectively override this. 4. ELF binaries have a GNU_STACK segment which can easily override the kernel default permissions. For nested-functions/trampolines, gcc already auto-enables executable stack in elf. Others needing this can use -Wl,-z,execstack option. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
443 lines
10 KiB
Plaintext
443 lines
10 KiB
Plaintext
#
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# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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#
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config ARC
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def_bool y
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select CLONE_BACKWARDS
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# ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
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select DEVTMPFS if !INITRAMFS_SOURCE=""
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select GENERIC_ATOMIC64
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select GENERIC_CLOCKEVENTS
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select GENERIC_FIND_FIRST_BIT
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# for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
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select GENERIC_IRQ_SHOW
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select GENERIC_PENDING_IRQ if SMP
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select GENERIC_SMP_IDLE_THREAD
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select HAVE_ARCH_KGDB
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select HAVE_ARCH_TRACEHOOK
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select HAVE_GENERIC_HARDIRQS
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select HAVE_IOREMAP_PROT
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select HAVE_KPROBES
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select HAVE_KRETPROBES
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select HAVE_MEMBLOCK
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select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
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select HAVE_OPROFILE
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select HAVE_PERF_EVENTS
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select IRQ_DOMAIN
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select MODULES_USE_ELF_RELA
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select NO_BOOTMEM
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select OF
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select OF_EARLY_FLATTREE
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select PERF_USE_VMALLOC
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config SCHED_OMIT_FRAME_POINTER
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def_bool y
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config GENERIC_CSUM
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def_bool y
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config RWSEM_GENERIC_SPINLOCK
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def_bool y
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config ARCH_FLATMEM_ENABLE
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def_bool y
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config MMU
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def_bool y
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config NO_IOPORT
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def_bool y
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config GENERIC_CALIBRATE_DELAY
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def_bool y
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config GENERIC_HWEIGHT
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def_bool y
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config STACKTRACE_SUPPORT
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def_bool y
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select STACKTRACE
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config HAVE_LATENCYTOP_SUPPORT
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def_bool y
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config NO_DMA
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def_bool n
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source "init/Kconfig"
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source "kernel/Kconfig.freezer"
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menu "ARC Architecture Configuration"
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menu "ARC Platform/SoC/Board"
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source "arch/arc/plat-arcfpga/Kconfig"
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source "arch/arc/plat-tb10x/Kconfig"
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#New platform adds here
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endmenu
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menu "ARC CPU Configuration"
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choice
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prompt "ARC Core"
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default ARC_CPU_770
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config ARC_CPU_750D
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bool "ARC750D"
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help
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Support for ARC750 core
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config ARC_CPU_770
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bool "ARC770"
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select ARC_CPU_REL_4_10
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help
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Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
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This core has a bunch of cool new features:
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-MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
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Shared Address Spaces (for sharing TLB entires in MMU)
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-Caches: New Prog Model, Region Flush
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-Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
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endchoice
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config CPU_BIG_ENDIAN
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bool "Enable Big Endian Mode"
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default n
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help
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Build kernel for Big Endian Mode of ARC CPU
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# If a platform can't work with 0x8000_0000 based dma_addr_t
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config ARC_PLAT_NEEDS_CPU_TO_DMA
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bool
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config SMP
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bool "Symmetric Multi-Processing (Incomplete)"
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default n
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select USE_GENERIC_SMP_HELPERS
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help
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This enables support for systems with more than one CPU. If you have
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a system with only one CPU, like most personal computers, say N. If
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you have a system with more than one CPU, say Y.
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if SMP
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config ARC_HAS_COH_CACHES
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def_bool n
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config ARC_HAS_COH_RTSC
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def_bool n
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config ARC_HAS_REENTRANT_IRQ_LV2
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def_bool n
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endif
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config NR_CPUS
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int "Maximum number of CPUs (2-32)"
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range 2 32
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depends on SMP
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default "2"
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menuconfig ARC_CACHE
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bool "Enable Cache Support"
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default y
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# if SMP, cache enabled ONLY if ARC implementation has cache coherency
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depends on !SMP || ARC_HAS_COH_CACHES
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if ARC_CACHE
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config ARC_CACHE_LINE_SHIFT
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int "Cache Line Length (as power of 2)"
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range 5 7
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default "6"
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help
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Starting with ARC700 4.9, Cache line length is configurable,
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This option specifies "N", with Line-len = 2 power N
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So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
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Linux only supports same line lengths for I and D caches.
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config ARC_HAS_ICACHE
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bool "Use Instruction Cache"
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default y
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config ARC_HAS_DCACHE
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bool "Use Data Cache"
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default y
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config ARC_CACHE_PAGES
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bool "Per Page Cache Control"
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default y
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depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
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help
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This can be used to over-ride the global I/D Cache Enable on a
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per-page basis (but only for pages accessed via MMU such as
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Kernel Virtual address or User Virtual Address)
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TLB entries have a per-page Cache Enable Bit.
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Note that Global I/D ENABLE + Per Page DISABLE works but corollary
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Global DISABLE + Per Page ENABLE won't work
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config ARC_CACHE_VIPT_ALIASING
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bool "Support VIPT Aliasing D$"
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depends on ARC_HAS_DCACHE
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default n
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endif #ARC_CACHE
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config ARC_HAS_ICCM
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bool "Use ICCM"
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help
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Single Cycle RAMS to store Fast Path Code
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default n
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config ARC_ICCM_SZ
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int "ICCM Size in KB"
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default "64"
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depends on ARC_HAS_ICCM
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config ARC_HAS_DCCM
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bool "Use DCCM"
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help
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Single Cycle RAMS to store Fast Path Data
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default n
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config ARC_DCCM_SZ
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int "DCCM Size in KB"
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default "64"
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depends on ARC_HAS_DCCM
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config ARC_DCCM_BASE
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hex "DCCM map address"
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default "0xA0000000"
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depends on ARC_HAS_DCCM
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config ARC_HAS_HW_MPY
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bool "Use Hardware Multiplier (Normal or Faster XMAC)"
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default y
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help
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Influences how gcc generates code for MPY operations.
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If enabled, MPYxx insns are generated, provided by Standard/XMAC
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Multipler. Otherwise software multipy lib is used
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choice
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prompt "ARC700 MMU Version"
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default ARC_MMU_V3 if ARC_CPU_770
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default ARC_MMU_V2 if ARC_CPU_750D
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config ARC_MMU_V1
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bool "MMU v1"
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help
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Orig ARC700 MMU
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config ARC_MMU_V2
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bool "MMU v2"
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help
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Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
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when 2 D-TLB and 1 I-TLB entries index into same 2way set.
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config ARC_MMU_V3
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bool "MMU v3"
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depends on ARC_CPU_770
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help
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Introduced with ARC700 4.10: New Features
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Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
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Shared Address Spaces (SASID)
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endchoice
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choice
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prompt "MMU Page Size"
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default ARC_PAGE_SIZE_8K
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config ARC_PAGE_SIZE_8K
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bool "8KB"
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help
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Choose between 8k vs 16k
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config ARC_PAGE_SIZE_16K
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bool "16KB"
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depends on ARC_MMU_V3
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config ARC_PAGE_SIZE_4K
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bool "4KB"
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depends on ARC_MMU_V3
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endchoice
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config ARC_COMPACT_IRQ_LEVELS
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bool "ARCompact IRQ Priorities: High(2)/Low(1)"
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default n
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# Timer HAS to be high priority, for any other high priority config
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select ARC_IRQ3_LV2
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# if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
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depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
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if ARC_COMPACT_IRQ_LEVELS
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config ARC_IRQ3_LV2
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bool
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config ARC_IRQ5_LV2
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bool
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config ARC_IRQ6_LV2
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bool
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endif
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config ARC_FPU_SAVE_RESTORE
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bool "Enable FPU state persistence across context switch"
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default n
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help
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Double Precision Floating Point unit had dedictaed regs which
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need to be saved/restored across context-switch.
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Note that ARC FPU is overly simplistic, unlike say x86, which has
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hardware pieces to allow software to conditionally save/restore,
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based on actual usage of FPU by a task. Thus our implemn does
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this for all tasks in system.
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config ARC_CANT_LLSC
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def_bool n
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menuconfig ARC_CPU_REL_4_10
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bool "Enable support for Rel 4.10 features"
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default n
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help
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-ARC770 (and dependent features) enabled
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-ARC750 also shares some of the new features with 770
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config ARC_HAS_LLSC
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bool "Insn: LLOCK/SCOND (efficient atomic ops)"
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default y
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depends on ARC_CPU_770 && !ARC_CANT_LLSC
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config ARC_HAS_SWAPE
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bool "Insn: SWAPE (endian-swap)"
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default y
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depends on ARC_CPU_REL_4_10
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config ARC_HAS_RTSC
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bool "Insn: RTSC (64-bit r/o cycle counter)"
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default y
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depends on ARC_CPU_REL_4_10
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# if SMP, enable RTSC only if counter is coherent across cores
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depends on !SMP || ARC_HAS_COH_RTSC
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endmenu # "ARC CPU Configuration"
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config LINUX_LINK_BASE
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hex "Linux Link Address"
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default "0x80000000"
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help
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ARC700 divides the 32 bit phy address space into two equal halves
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-Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
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-Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
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Typically Linux kernel is linked at the start of untransalted addr,
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hence the default value of 0x8zs.
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However some customers have peripherals mapped at this addr, so
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Linux needs to be scooted a bit.
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If you don't know what the above means, leave this setting alone.
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config ARC_CURR_IN_REG
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bool "Dedicate Register r25 for current_task pointer"
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default y
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help
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This reserved Register R25 to point to Current Task in
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kernel mode. This saves memory access for each such access
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config ARC_MISALIGN_ACCESS
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bool "Emulate unaligned memory access (userspace only)"
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default N
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select SYSCTL_ARCH_UNALIGN_NO_WARN
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select SYSCTL_ARCH_UNALIGN_ALLOW
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help
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This enables misaligned 16 & 32 bit memory access from user space.
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Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
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potential bugs in code
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config HZ
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int "Timer Frequency"
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default 100
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config ARC_METAWARE_HLINK
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bool "Support for Metaware debugger assisted Host access"
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default n
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help
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This options allows a Linux userland apps to directly access
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host file system (open/creat/read/write etc) with help from
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Metaware Debugger. This can come in handy for Linux-host communication
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when there is no real usable peripheral such as EMAC.
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menuconfig ARC_DBG
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bool "ARC debugging"
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default y
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config ARC_DW2_UNWIND
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bool "Enable DWARF specific kernel stack unwind"
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depends on ARC_DBG
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default y
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select KALLSYMS
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help
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Compiles the kernel with DWARF unwind information and can be used
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to get stack backtraces.
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If you say Y here the resulting kernel image will be slightly larger
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but not slower, and it will give very useful debugging information.
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If you don't debug the kernel, you can say N, but we may not be able
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to solve problems without frame unwind information
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config ARC_DBG_TLB_PARANOIA
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bool "Paranoia Checks in Low Level TLB Handlers"
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depends on ARC_DBG
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default n
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config ARC_DBG_TLB_MISS_COUNT
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bool "Profile TLB Misses"
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default n
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select DEBUG_FS
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depends on ARC_DBG
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help
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Counts number of I and D TLB Misses and exports them via Debugfs
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The counters can be cleared via Debugfs as well
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config CMDLINE_UBOOT
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bool "Support U-boot kernel command line passing"
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default n
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help
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If you are using U-boot (www.denx.de) and wish to pass the kernel
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command line from the U-boot environment to the Linux kernel then
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switch this option on.
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ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
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to it. kernel startup code will append this to DeviceTree
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/bootargs provided cmdline args.
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config ARC_BUILTIN_DTB_NAME
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string "Built in DTB"
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help
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Set the name of the DTB to embed in the vmlinux binary
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Leaving it blank selects the minimal "skeleton" dtb
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source "kernel/Kconfig.preempt"
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menu "Executable file formats"
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source "fs/Kconfig.binfmt"
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endmenu
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endmenu # "ARC Architecture Configuration"
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source "mm/Kconfig"
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source "net/Kconfig"
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source "drivers/Kconfig"
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source "fs/Kconfig"
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source "arch/arc/Kconfig.debug"
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source "security/Kconfig"
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source "crypto/Kconfig"
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source "lib/Kconfig"
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