diff options
Diffstat (limited to 'arch/arm/mm/Kconfig')
| -rw-r--r-- | arch/arm/mm/Kconfig | 558 |
1 files changed, 424 insertions, 134 deletions
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index d490f3773c0..c348eaee7ee 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -1,38 +1,17 @@ comment "Processor Type" -config CPU_32 - bool - default y - # Select CPU types depending on the architecture selected. This selects # which CPUs we support in the kernel image, and the compiler instruction # optimiser behaviour. -# ARM610 -config CPU_ARM610 - bool "Support ARM610 processor" if ARCH_RPC - select CPU_32v3 - select CPU_CACHE_V3 - select CPU_CACHE_VIVT - select CPU_CP15_MMU - select CPU_COPY_V3 if MMU - select CPU_TLB_V3 if MMU - select CPU_PABRT_NOIFAR - help - The ARM610 is the successor to the ARM3 processor - and was produced by VLSI Technology Inc. - - Say Y if you want support for the ARM610 processor. - Otherwise, say N. - # ARM7TDMI config CPU_ARM7TDMI bool "Support ARM7TDMI processor" depends on !MMU select CPU_32v4T select CPU_ABRT_LV4T - select CPU_PABRT_NOIFAR select CPU_CACHE_V4 + select CPU_PABRT_LEGACY help A 32-bit RISC microprocessor based on the ARM7 processor core which has no memory control unit and cache. @@ -40,35 +19,16 @@ config CPU_ARM7TDMI Say Y if you want support for the ARM7TDMI processor. Otherwise, say N. -# ARM710 -config CPU_ARM710 - bool "Support ARM710 processor" if ARCH_RPC - select CPU_32v3 - select CPU_CACHE_V3 - select CPU_CACHE_VIVT - select CPU_CP15_MMU - select CPU_COPY_V3 if MMU - select CPU_TLB_V3 if MMU - select CPU_PABRT_NOIFAR - help - A 32-bit RISC microprocessor based on the ARM7 processor core - designed by Advanced RISC Machines Ltd. The ARM710 is the - successor to the ARM610 processor. It was released in - July 1994 by VLSI Technology Inc. - - Say Y if you want support for the ARM710 processor. - Otherwise, say N. - # ARM720T config CPU_ARM720T bool "Support ARM720T processor" if ARCH_INTEGRATOR select CPU_32v4T select CPU_ABRT_LV4T - select CPU_PABRT_NOIFAR select CPU_CACHE_V4 select CPU_CACHE_VIVT - select CPU_CP15_MMU select CPU_COPY_V4WT if MMU + select CPU_CP15_MMU + select CPU_PABRT_LEGACY select CPU_TLB_V4WT if MMU help A 32-bit RISC processor with 8kByte Cache, Write Buffer and @@ -83,9 +43,9 @@ config CPU_ARM740T depends on !MMU select CPU_32v4T select CPU_ABRT_LV4T - select CPU_PABRT_NOIFAR - select CPU_CACHE_V3 # although the core is v4t + select CPU_CACHE_V4 select CPU_CP15_MPU + select CPU_PABRT_LEGACY help A 32-bit RISC processor with 8KB cache or 4KB variants, write buffer and MPU(Protection Unit) built around @@ -100,8 +60,8 @@ config CPU_ARM9TDMI depends on !MMU select CPU_32v4T select CPU_ABRT_NOMMU - select CPU_PABRT_NOIFAR select CPU_CACHE_V4 + select CPU_PABRT_LEGACY help A 32-bit RISC microprocessor based on the ARM9 processor core which has no memory control unit and cache. @@ -114,18 +74,15 @@ config CPU_ARM920T bool "Support ARM920T processor" if ARCH_INTEGRATOR select CPU_32v4T select CPU_ABRT_EV4T - select CPU_PABRT_NOIFAR select CPU_CACHE_V4WT select CPU_CACHE_VIVT - select CPU_CP15_MMU select CPU_COPY_V4WB if MMU + select CPU_CP15_MMU + select CPU_PABRT_LEGACY select CPU_TLB_V4WBI if MMU help The ARM920T is licensed to be produced by numerous vendors, - and is used in the Maverick EP9312 and the Samsung S3C2410. - - More information on the Maverick EP9312 at - <http://linuxdevices.com/products/PD2382866068.html>. + and is used in the Cirrus EP93xx and the Samsung S3C2410. Say Y if you want support for the ARM920T processor. Otherwise, say N. @@ -135,11 +92,11 @@ config CPU_ARM922T bool "Support ARM922T processor" if ARCH_INTEGRATOR select CPU_32v4T select CPU_ABRT_EV4T - select CPU_PABRT_NOIFAR select CPU_CACHE_V4WT select CPU_CACHE_VIVT - select CPU_CP15_MMU select CPU_COPY_V4WB if MMU + select CPU_CP15_MMU + select CPU_PABRT_LEGACY select CPU_TLB_V4WBI if MMU help The ARM922T is a version of the ARM920T, but with smaller @@ -154,11 +111,11 @@ config CPU_ARM925T bool "Support ARM925T processor" if ARCH_OMAP1 select CPU_32v4T select CPU_ABRT_EV4T - select CPU_PABRT_NOIFAR select CPU_CACHE_V4WT select CPU_CACHE_VIVT - select CPU_CP15_MMU select CPU_COPY_V4WB if MMU + select CPU_CP15_MMU + select CPU_PABRT_LEGACY select CPU_TLB_V4WBI if MMU help The ARM925T is a mix between the ARM920T and ARM926T, but with @@ -173,10 +130,10 @@ config CPU_ARM926T bool "Support ARM926T processor" if ARCH_INTEGRATOR || MACH_REALVIEW_EB select CPU_32v5 select CPU_ABRT_EV5TJ - select CPU_PABRT_NOIFAR select CPU_CACHE_VIVT - select CPU_CP15_MMU select CPU_COPY_V4WB if MMU + select CPU_CP15_MMU + select CPU_PABRT_LEGACY select CPU_TLB_V4WBI if MMU help This is a variant of the ARM920. It has slightly different @@ -186,15 +143,33 @@ config CPU_ARM926T Say Y if you want support for the ARM926T processor. Otherwise, say N. +# FA526 +config CPU_FA526 + bool + select CPU_32v4 + select CPU_ABRT_EV4 + select CPU_CACHE_FA + select CPU_CACHE_VIVT + select CPU_COPY_FA if MMU + select CPU_CP15_MMU + select CPU_PABRT_LEGACY + select CPU_TLB_FA if MMU + help + The FA526 is a version of the ARMv4 compatible processor with + Branch Target Buffer, Unified TLB and cache line size 16. + + Say Y if you want support for the FA526 processor. + Otherwise, say N. + # ARM940T config CPU_ARM940T bool "Support ARM940T processor" if ARCH_INTEGRATOR depends on !MMU select CPU_32v4T select CPU_ABRT_NOMMU - select CPU_PABRT_NOIFAR select CPU_CACHE_VIVT select CPU_CP15_MPU + select CPU_PABRT_LEGACY help ARM940T is a member of the ARM9TDMI family of general- purpose microprocessors with MPU and separate 4KB @@ -210,9 +185,9 @@ config CPU_ARM946E depends on !MMU select CPU_32v5 select CPU_ABRT_NOMMU - select CPU_PABRT_NOIFAR select CPU_CACHE_VIVT select CPU_CP15_MPU + select CPU_PABRT_LEGACY help ARM946E-S is a member of the ARM9E-S family of high- performance, 32-bit system-on-chip processor solutions. @@ -226,11 +201,11 @@ config CPU_ARM1020 bool "Support ARM1020T (rev 0) processor" if ARCH_INTEGRATOR select CPU_32v5 select CPU_ABRT_EV4T - select CPU_PABRT_NOIFAR select CPU_CACHE_V4WT select CPU_CACHE_VIVT - select CPU_CP15_MMU select CPU_COPY_V4WB if MMU + select CPU_CP15_MMU + select CPU_PABRT_LEGACY select CPU_TLB_V4WBI if MMU help The ARM1020 is the 32K cached version of the ARM10 processor, @@ -242,25 +217,25 @@ config CPU_ARM1020 # ARM1020E - needs validating config CPU_ARM1020E bool "Support ARM1020E processor" if ARCH_INTEGRATOR + depends on n select CPU_32v5 select CPU_ABRT_EV4T - select CPU_PABRT_NOIFAR select CPU_CACHE_V4WT select CPU_CACHE_VIVT - select CPU_CP15_MMU select CPU_COPY_V4WB if MMU + select CPU_CP15_MMU + select CPU_PABRT_LEGACY select CPU_TLB_V4WBI if MMU - depends on n # ARM1022E config CPU_ARM1022 bool "Support ARM1022E processor" if ARCH_INTEGRATOR select CPU_32v5 select CPU_ABRT_EV4T - select CPU_PABRT_NOIFAR select CPU_CACHE_VIVT - select CPU_CP15_MMU select CPU_COPY_V4WB if MMU # can probably do better + select CPU_CP15_MMU + select CPU_PABRT_LEGACY select CPU_TLB_V4WBI if MMU help The ARM1022E is an implementation of the ARMv5TE architecture @@ -275,10 +250,10 @@ config CPU_ARM1026 bool "Support ARM1026EJ-S processor" if ARCH_INTEGRATOR select CPU_32v5 select CPU_ABRT_EV5T # But need Jazelle, but EV5TJ ignores bit 10 - select CPU_PABRT_NOIFAR select CPU_CACHE_VIVT - select CPU_CP15_MMU select CPU_COPY_V4WB if MMU # can probably do better + select CPU_CP15_MMU + select CPU_PABRT_LEGACY select CPU_TLB_V4WBI if MMU help The ARM1026EJ-S is an implementation of the ARMv5TEJ architecture @@ -289,15 +264,15 @@ config CPU_ARM1026 # SA110 config CPU_SA110 - bool "Support StrongARM(R) SA-110 processor" if ARCH_RPC + bool select CPU_32v3 if ARCH_RPC select CPU_32v4 if !ARCH_RPC select CPU_ABRT_EV4 - select CPU_PABRT_NOIFAR select CPU_CACHE_V4WB select CPU_CACHE_VIVT - select CPU_CP15_MMU select CPU_COPY_V4WB if MMU + select CPU_CP15_MMU + select CPU_PABRT_LEGACY select CPU_TLB_V4WB if MMU help The Intel StrongARM(R) SA-110 is a 32-bit microprocessor and @@ -313,10 +288,10 @@ config CPU_SA1100 bool select CPU_32v4 select CPU_ABRT_EV4 - select CPU_PABRT_NOIFAR select CPU_CACHE_V4WB select CPU_CACHE_VIVT select CPU_CP15_MMU + select CPU_PABRT_LEGACY select CPU_TLB_V4WB if MMU # XScale @@ -324,9 +299,9 @@ config CPU_XSCALE bool select CPU_32v5 select CPU_ABRT_EV5T - select CPU_PABRT_NOIFAR select CPU_CACHE_VIVT select CPU_CP15_MMU + select CPU_PABRT_LEGACY select CPU_TLB_V4WBI if MMU # XScale Core Version 3 @@ -334,21 +309,32 @@ config CPU_XSC3 bool select CPU_32v5 select CPU_ABRT_EV5T - select CPU_PABRT_NOIFAR select CPU_CACHE_VIVT select CPU_CP15_MMU + select CPU_PABRT_LEGACY select CPU_TLB_V4WBI if MMU select IO_36 +# Marvell PJ1 (Mohawk) +config CPU_MOHAWK + bool + select CPU_32v5 + select CPU_ABRT_EV5T + select CPU_CACHE_VIVT + select CPU_COPY_V4WB if MMU + select CPU_CP15_MMU + select CPU_PABRT_LEGACY + select CPU_TLB_V4WBI if MMU + # Feroceon config CPU_FEROCEON bool select CPU_32v5 select CPU_ABRT_EV5T - select CPU_PABRT_NOIFAR select CPU_CACHE_VIVT - select CPU_CP15_MMU select CPU_COPY_FEROCEON if MMU + select CPU_CP15_MMU + select CPU_PABRT_LEGACY select CPU_TLB_FEROCEON if MMU config CPU_FEROCEON_OLD_ID @@ -360,74 +346,117 @@ config CPU_FEROCEON_OLD_ID for which the CPU ID is equal to the ARM926 ID. Relevant for Feroceon-1850 and early Feroceon-2850. +# Marvell PJ4 +config CPU_PJ4 + bool + select ARM_THUMBEE + select CPU_V7 + +config CPU_PJ4B + bool + select CPU_V7 + # ARMv6 config CPU_V6 - bool "Support ARM V6 processor" if ARCH_INTEGRATOR || MACH_REALVIEW_EB + bool "Support ARM V6 processor" if ARCH_INTEGRATOR || MACH_REALVIEW_EB || MACH_REALVIEW_PBX select CPU_32v6 select CPU_ABRT_EV6 - select CPU_PABRT_NOIFAR select CPU_CACHE_V6 select CPU_CACHE_VIPT + select CPU_COPY_V6 if MMU select CPU_CP15_MMU select CPU_HAS_ASID if MMU - select CPU_COPY_V6 if MMU + select CPU_PABRT_V6 select CPU_TLB_V6 if MMU # ARMv6k -config CPU_32v6K - bool "Support ARM V6K processor extensions" if !SMP - depends on CPU_V6 - default y if SMP && !ARCH_MX3 - help - Say Y here if your ARMv6 processor supports the 'K' extension. - This enables the kernel to use some instructions not present - on previous processors, and as such a kernel build with this - enabled will not boot on processors with do not support these - instructions. +config CPU_V6K + bool "Support ARM V6K processor" if ARCH_INTEGRATOR || MACH_REALVIEW_EB || MACH_REALVIEW_PBX + select CPU_32v6 + select CPU_32v6K + select CPU_ABRT_EV6 + select CPU_CACHE_V6 + select CPU_CACHE_VIPT + select CPU_COPY_V6 if MMU + select CPU_CP15_MMU + select CPU_HAS_ASID if MMU + select CPU_PABRT_V6 + select CPU_TLB_V6 if MMU # ARMv7 config CPU_V7 - bool "Support ARM V7 processor" if ARCH_INTEGRATOR || MACH_REALVIEW_EB + bool "Support ARM V7 processor" if ARCH_INTEGRATOR || MACH_REALVIEW_EB || MACH_REALVIEW_PBX select CPU_32v6K select CPU_32v7 select CPU_ABRT_EV7 - select CPU_PABRT_IFAR select CPU_CACHE_V7 select CPU_CACHE_VIPT - select CPU_CP15_MMU - select CPU_HAS_ASID if MMU select CPU_COPY_V6 if MMU + select CPU_CP15_MMU if MMU + select CPU_CP15_MPU if !MMU + select CPU_HAS_ASID if MMU + select CPU_PABRT_V7 select CPU_TLB_V7 if MMU +# ARMv7M +config CPU_V7M + bool + select CPU_32v7M + select CPU_ABRT_NOMMU + select CPU_CACHE_NOP + select CPU_PABRT_LEGACY + select CPU_THUMBONLY + +config CPU_THUMBONLY + bool + # There are no CPUs available with MMU that don't implement an ARM ISA: + depends on !MMU + help + Select this if your CPU doesn't support the 32 bit ARM instructions. + # Figure out what processor architecture version we should be using. # This defines the compiler instruction set which depends on the machine type. config CPU_32v3 bool - select TLS_REG_EMUL if SMP || !MMU + select CPU_USE_DOMAINS if MMU select NEEDS_SYSCALL_FOR_CMPXCHG if SMP + select NEED_KUSER_HELPERS + select TLS_REG_EMUL if SMP || !MMU config CPU_32v4 bool - select TLS_REG_EMUL if SMP || !MMU + select CPU_USE_DOMAINS if MMU select NEEDS_SYSCALL_FOR_CMPXCHG if SMP + select NEED_KUSER_HELPERS + select TLS_REG_EMUL if SMP || !MMU config CPU_32v4T bool - select TLS_REG_EMUL if SMP || !MMU + select CPU_USE_DOMAINS if MMU select NEEDS_SYSCALL_FOR_CMPXCHG if SMP + select NEED_KUSER_HELPERS + select TLS_REG_EMUL if SMP || !MMU config CPU_32v5 bool - select TLS_REG_EMUL if SMP || !MMU + select CPU_USE_DOMAINS if MMU select NEEDS_SYSCALL_FOR_CMPXCHG if SMP + select NEED_KUSER_HELPERS + select TLS_REG_EMUL if SMP || !MMU config CPU_32v6 bool select TLS_REG_EMUL if !CPU_32v6K && !MMU +config CPU_32v6K + bool + config CPU_32v7 bool +config CPU_32v7M + bool + # The abort model config CPU_ABRT_NOMMU bool @@ -453,16 +482,16 @@ config CPU_ABRT_EV6 config CPU_ABRT_EV7 bool -config CPU_PABRT_IFAR +config CPU_PABRT_LEGACY bool -config CPU_PABRT_NOIFAR +config CPU_PABRT_V6 bool -# The cache model -config CPU_CACHE_V3 +config CPU_PABRT_V7 bool +# The cache model config CPU_CACHE_V4 bool @@ -478,17 +507,20 @@ config CPU_CACHE_V6 config CPU_CACHE_V7 bool +config CPU_CACHE_NOP + bool + config CPU_CACHE_VIVT bool config CPU_CACHE_VIPT bool -if MMU -# The copy-page model -config CPU_COPY_V3 +config CPU_CACHE_FA bool +if MMU +# The copy-page model config CPU_COPY_V4WT bool @@ -498,15 +530,13 @@ config CPU_COPY_V4WB config CPU_COPY_FEROCEON bool -config CPU_COPY_V6 +config CPU_COPY_FA bool -# This selects the TLB model -config CPU_TLB_V3 +config CPU_COPY_V6 bool - help - ARM Architecture Version 3 TLB. +# This selects the TLB model config CPU_TLB_V4WT bool help @@ -528,12 +558,21 @@ config CPU_TLB_FEROCEON help Feroceon TLB (v4wbi with non-outer-cachable page table walks). +config CPU_TLB_FA + bool + help + Faraday ARM FA526 architecture, unified TLB with writeback cache + and invalidate instruction cache entry. Branch target buffer is + also supported. + config CPU_TLB_V6 bool config CPU_TLB_V7 bool +config VERIFY_PERMISSION_FAULT + bool endif config CPU_HAS_ASID @@ -559,6 +598,12 @@ config CPU_CP15_MPU help Processor has the CP15 register, which has MPU related registers. +config CPU_USE_DOMAINS + bool + help + This option enables or disables the use of domain switching + via the set_fs() function. + # # CPU supports 36-bit I/O # @@ -567,9 +612,31 @@ config IO_36 comment "Processor Features" +config ARM_LPAE + bool "Support for the Large Physical Address Extension" + depends on MMU && CPU_32v7 && !CPU_32v6 && !CPU_32v5 && \ + !CPU_32v4 && !CPU_32v3 + help + Say Y if you have an ARMv7 processor supporting the LPAE page + table format and you would like to access memory beyond the + 4GB limit. The resulting kernel image will not run on + processors without the LPA extension. + + If unsure, say N. + +config ARCH_PHYS_ADDR_T_64BIT + def_bool ARM_LPAE + +config ARCH_DMA_ADDR_T_64BIT + bool + config ARM_THUMB - bool "Support Thumb user binaries" - depends on CPU_ARM720T || CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM940T || CPU_ARM946E || CPU_ARM1020 || CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || CPU_XSCALE || CPU_XSC3 || CPU_V6 || CPU_V7 || CPU_FEROCEON + bool "Support Thumb user binaries" if !CPU_THUMBONLY + depends on CPU_ARM720T || CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || \ + CPU_ARM925T || CPU_ARM926T || CPU_ARM940T || CPU_ARM946E || \ + CPU_ARM1020 || CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \ + CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_V6 || CPU_V6K || \ + CPU_V7 || CPU_FEROCEON || CPU_V7M default y help Say Y if you want to include kernel support for running user space @@ -588,6 +655,46 @@ config ARM_THUMBEE Say Y here if you have a CPU with the ThumbEE extension and code to make use of it. Say N for code that can run on CPUs without ThumbEE. +config ARM_VIRT_EXT + bool + depends on MMU + default y if CPU_V7 + help + Enable the kernel to make use of the ARM Virtualization + Extensions to install hypervisors without run-time firmware + assistance. + + A compliant bootloader is required in order to make maximum + use of this feature. Refer to Documentation/arm/Booting for + details. + +config SWP_EMULATE + bool "Emulate SWP/SWPB instructions" + depends on CPU_V7 + default y if SMP + select HAVE_PROC_CPU if PROC_FS + help + ARMv6 architecture deprecates use of the SWP/SWPB instructions. + ARMv7 multiprocessing extensions introduce the ability to disable + these instructions, triggering an undefined instruction exception + when executed. Say Y here to enable software emulation of these + instructions for userspace (not kernel) using LDREX/STREX. + Also creates /proc/cpu/swp_emulation for statistics. + + In some older versions of glibc [<=2.8] SWP is used during futex + trylock() operations with the assumption that the code will not + be preempted. This invalid assumption may be more likely to fail + with SWP emulation enabled, leading to deadlock of the user + application. + + NOTE: when accessing uncached shared regions, LDREX/STREX rely + on an external transaction monitoring block called a global + monitor to maintain update atomicity. If your system does not + implement a global monitor, this option can cause programs that + perform SWP operations to uncached memory to deadlock. + + If unsure, say Y. + config CPU_BIG_ENDIAN bool "Build big-endian kernel" depends on ARCH_SUPPORTS_BIG_ENDIAN @@ -597,13 +704,26 @@ config CPU_BIG_ENDIAN port must properly enable any big-endian related features of your chipset/board/processor. +config CPU_ENDIAN_BE8 + bool + depends on CPU_BIG_ENDIAN + default CPU_V6 || CPU_V6K || CPU_V7 + help + Support for the BE-8 (big-endian) mode on ARMv6 and ARMv7 processors. + +config CPU_ENDIAN_BE32 + bool + depends on CPU_BIG_ENDIAN + default !CPU_ENDIAN_BE8 + help + Support for the BE-32 (big-endian) mode on pre-ARMv6 processors. + config CPU_HIGH_VECTOR depends on !MMU && CPU_CP15 && !CPU_ARM740T bool "Select the High exception vector" - default n help Say Y here to select high exception vector(0xFFFF0000~). - The exception vector can be vary depending on the platform + The exception vector can vary depending on the platform design in nommu mode. If your platform needs to select high exception vector, say Y. Otherwise or if you are unsure, say N, and the low exception @@ -611,7 +731,7 @@ config CPU_HIGH_VECTOR config CPU_ICACHE_DISABLE bool "Disable I-Cache (I-bit)" - depends on CPU_CP15 && !(CPU_ARM610 || CPU_ARM710 || CPU_ARM720T || CPU_ARM740T || CPU_XSCALE || CPU_XSC3) + depends on CPU_CP15 && !(CPU_ARM720T || CPU_ARM740T || CPU_XSCALE || CPU_XSC3) help Say Y here to disable the processor instruction cache. Unless you have a reason not to or are unsure, say N. @@ -638,7 +758,7 @@ config CPU_DCACHE_SIZE config CPU_DCACHE_WRITETHROUGH bool "Force write through D-cache" - depends on (CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM940T || CPU_ARM946E || CPU_ARM1020) && !CPU_DCACHE_DISABLE + depends on (CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM940T || CPU_ARM946E || CPU_ARM1020 || CPU_FA526) && !CPU_DCACHE_DISABLE default y if CPU_ARM925T help Say Y here to use the data cache in writethrough mode. Unless you @@ -653,42 +773,88 @@ config CPU_CACHE_ROUND_ROBIN config CPU_BPREDICT_DISABLE bool "Disable branch prediction" - depends on CPU_ARM1020 || CPU_V6 || CPU_XSC3 || CPU_V7 + depends on CPU_ARM1020 || CPU_V6 || CPU_V6K || CPU_MOHAWK || CPU_XSC3 || CPU_V7 || CPU_FA526 help Say Y here to disable branch prediction. If unsure, say N. config TLS_REG_EMUL bool + select NEED_KUSER_HELPERS help An SMP system using a pre-ARMv6 processor (there are apparently a few prototypes like that in existence) and therefore access to that required register must be emulated. -config HAS_TLS_REG - bool - depends on !TLS_REG_EMUL - default y if SMP || CPU_32v7 - help - This selects support for the CP15 thread register. - It is defined to be available on some ARMv6 processors (including - all SMP capable ARMv6's) or later processors. User space may - assume directly accessing that register and always obtain the - expected value only on ARMv7 and above. - config NEEDS_SYSCALL_FOR_CMPXCHG bool + select NEED_KUSER_HELPERS help SMP on a pre-ARMv6 processor? Well OK then. Forget about fast user space cmpxchg support. It is just not possible. +config NEED_KUSER_HELPERS + bool + +config KUSER_HELPERS + bool "Enable kuser helpers in vector page" if !NEED_KUSER_HELPERS + default y + help + Warning: disabling this option may break user programs. + + Provide kuser helpers in the vector page. The kernel provides + helper code to userspace in read only form at a fixed location + in the high vector page to allow userspace to be independent of + the CPU type fitted to the system. This permits binaries to be + run on ARMv4 through to ARMv7 without modification. + + See Documentation/arm/kernel_user_helpers.txt for details. + + However, the fixed address nature of these helpers can be used + by ROP (return orientated programming) authors when creating + exploits. + + If all of the binaries and libraries which run on your platform + are built specifically for your platform, and make no use of + these helpers, then you can turn this option off to hinder + such exploits. However, in that case, if a binary or library + relying on those helpers is run, it will receive a SIGILL signal, + which will terminate the program. + + Say N here only if you are absolutely certain that you do not + need these helpers; otherwise, the safe option is to say Y. + +config DMA_CACHE_RWFO + bool "Enable read/write for ownership DMA cache maintenance" + depends on CPU_V6K && SMP + default y + help + The Snoop Control Unit on ARM11MPCore does not detect the + cache maintenance operations and the dma_{map,unmap}_area() + functions may leave stale cache entries on other CPUs. By + enabling this option, Read or Write For Ownership in the ARMv6 + DMA cache maintenance functions is performed. These LDR/STR + instructions change the cache line state to shared or modified + so that the cache operation has the desired effect. + + Note that the workaround is only valid on processors that do + not perform speculative loads into the D-cache. For such + processors, if cache maintenance operations are not broadcast + in hardware, other workarounds are needed (e.g. cache + maintenance broadcasting in software via FIQ). + config OUTER_CACHE bool - default n + +config OUTER_CACHE_SYNC + bool + help + The outer cache has a outer_cache_fns.sync function pointer + that can be used to drain the write buffer of the outer cache. config CACHE_FEROCEON_L2 bool "Enable the Feroceon L2 cache controller" - depends on ARCH_KIRKWOOD || ARCH_MV78XX0 + depends on ARCH_KIRKWOOD || ARCH_MV78XX0 || ARCH_MVEBU default y select OUTER_CACHE help @@ -697,19 +863,99 @@ config CACHE_FEROCEON_L2 config CACHE_FEROCEON_L2_WRITETHROUGH bool "Force Feroceon L2 cache write through" depends on CACHE_FEROCEON_L2 - default n help Say Y here to use the Feroceon L2 cache in writethrough mode. Unless you specifically require this, say N for writeback mode. +config MIGHT_HAVE_CACHE_L2X0 + bool + help + This option should be selected by machines which have a L2x0 + or PL310 cache controller, but where its use is optional. + + The only effect of this option is to make CACHE_L2X0 and + related options available to the user for configuration. + + Boards or SoCs which always require the cache controller + support to be present should select CACHE_L2X0 directly + instead of this option, thus preventing the user from + inadvertently configuring a broken kernel. + config CACHE_L2X0 - bool "Enable the L2x0 outer cache controller" - depends on REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || MACH_REALVIEW_PB1176 || REALVIEW_EB_A9MP - default y + bool "Enable the L2x0 outer cache controller" if MIGHT_HAVE_CACHE_L2X0 + default MIGHT_HAVE_CACHE_L2X0 select OUTER_CACHE + select OUTER_CACHE_SYNC help This option enables the L2x0 PrimeCell. +if CACHE_L2X0 + +config CACHE_PL310 + bool + default y if CPU_V7 && !(CPU_V6 || CPU_V6K) + help + This option enables optimisations for the PL310 cache + controller. + +config PL310_ERRATA_588369 + bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines" + help + The PL310 L2 cache controller implements three types of Clean & + Invalidate maintenance operations: by Physical Address + (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC). + They are architecturally defined to behave as the execution of a + clean operation followed immediately by an invalidate operation, + both performing to the same memory location. This functionality + is not correctly implemented in PL310 as clean lines are not + invalidated as a result of these operations. + +config PL310_ERRATA_727915 + bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption" + help + PL310 implements the Clean & Invalidate by Way L2 cache maintenance + operation (offset 0x7FC). This operation runs in background so that + PL310 can handle normal accesses while it is in progress. Under very + rare circumstances, due to this erratum, write data can be lost when + PL310 treats a cacheable write transaction during a Clean & + Invalidate by Way operation. + +config PL310_ERRATA_753970 + bool "PL310 errata: cache sync operation may be faulty" + help + This option enables the workaround for the 753970 PL310 (r3p0) erratum. + + Under some condition the effect of cache sync operation on + the store buffer still remains when the operation completes. + This means that the store buffer is always asked to drain and + this prevents it from merging any further writes. The workaround + is to replace the normal offset of cache sync operation (0x730) + by another offset targeting an unmapped PL310 register 0x740. + This has the same effect as the cache sync operation: store buffer + drain and waiting for all buffers empty. + +config PL310_ERRATA_769419 + bool "PL310 errata: no automatic Store Buffer drain" + help + On revisions of the PL310 prior to r3p2, the Store Buffer does + not automatically drain. This can cause normal, non-cacheable + writes to be retained when the memory system is idle, leading + to suboptimal I/O performance for drivers using coherent DMA. + This option adds a write barrier to the cpu_idle loop so that, + on systems with an outer cache, the store buffer is drained + explicitly. + +endif + +config CACHE_TAUROS2 + bool "Enable the Tauros2 L2 cache controller" + depends on (ARCH_DOVE || ARCH_MMP || CPU_PJ4) + default y + select OUTER_CACHE + help + This option enables the Tauros2 L2 cache controller (as + found on PJ1/PJ4). + config CACHE_XSC3L2 bool "Enable the L2 cache on XScale3" depends on CPU_XSC3 @@ -717,3 +963,47 @@ config CACHE_XSC3L2 select OUTER_CACHE help This option enables the L2 cache on XScale3. + +config ARM_L1_CACHE_SHIFT_6 + bool + default y if CPU_V7 + help + Setting ARM L1 cache line size to 64 Bytes. + +config ARM_L1_CACHE_SHIFT + int + default 6 if ARM_L1_CACHE_SHIFT_6 + default 5 + +config ARM_DMA_MEM_BUFFERABLE + bool "Use non-cacheable memory for DMA" if (CPU_V6 || CPU_V6K) && !CPU_V7 + depends on !(MACH_REALVIEW_PB1176 || REALVIEW_EB_ARM11MP || \ + MACH_REALVIEW_PB11MP) + default y if CPU_V6 || CPU_V6K || CPU_V7 + help + Historically, the kernel has used strongly ordered mappings to + provide DMA coherent memory. With the advent of ARMv7, mapping + memory with differing types results in unpredictable behaviour, + so on these CPUs, this option is forced on. + + Multiple mappings with differing attributes is also unpredictable + on ARMv6 CPUs, but since they do not have aggressive speculative + prefetch, no harm appears to occur. + + However, drivers may be missing the necessary barriers for ARMv6, + and therefore turning this on may result in unpredictable driver + behaviour. Therefore, we offer this as an option. + + You are recommended say 'Y' here and debug any affected drivers. + +config ARCH_HAS_BARRIERS + bool + help + This option allows the use of custom mandatory barriers + included via the mach/barriers.h file. + +config ARCH_SUPPORTS_BIG_ENDIAN + bool + help + This option specifies the architecture can support big endian + operation. |