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linux-headers-5.15.0-181
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/usr/src/linux-headers-5.15.0-181/arch/sh/mm/Kconfig
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# SPDX-License-Identifier: GPL-2.0 menu "Memory management options" config MMU bool "Support for memory management hardware" depends on !CPU_SH2 default y help Some SH processors (such as SH-2/SH-2A) lack an MMU. In order to boot on these systems, this option must not be set. On other systems (such as the SH-3 and 4) where an MMU exists, turning this off will boot the kernel on these machines with the MMU implicitly switched off. config PAGE_OFFSET hex default "0x80000000" if MMU default "0x00000000" config FORCE_MAX_ZONEORDER int "Maximum zone order" range 9 64 if PAGE_SIZE_16KB default "9" if PAGE_SIZE_16KB range 7 64 if PAGE_SIZE_64KB default "7" if PAGE_SIZE_64KB range 11 64 default "14" if !MMU default "11" help The kernel memory allocator divides physically contiguous memory blocks into "zones", where each zone is a power of two number of pages. This option selects the largest power of two that the kernel keeps in the memory allocator. If you need to allocate very large blocks of physically contiguous memory, then you may need to increase this value. This config option is actually maximum order plus one. For example, a value of 11 means that the largest free memory block is 2^10 pages. The page size is not necessarily 4KB. Keep this in mind when choosing a value for this option. config MEMORY_START hex "Physical memory start address" default "0x08000000" help Computers built with Hitachi SuperH processors always map the ROM starting at address zero. But the processor does not specify the range that RAM takes. The physical memory (RAM) start address will be automatically set to 08000000. Other platforms, such as the Solution Engine boards typically map RAM at 0C000000. Tweak this only when porting to a new machine which does not already have a defconfig. Changing it from the known correct value on any of the known systems will only lead to disaster. config MEMORY_SIZE hex "Physical memory size" default "0x04000000" help This sets the default memory size assumed by your SH kernel. It can be overridden as normal by the 'mem=' argument on the kernel command line. If unsure, consult your board specifications or just leave it as 0x04000000 which was the default value before this became configurable. # Physical addressing modes config 29BIT def_bool !32BIT select UNCACHED_MAPPING config 32BIT bool default !MMU config PMB bool "Support 32-bit physical addressing through PMB" depends on MMU && CPU_SH4A && !CPU_SH4AL_DSP select 32BIT select UNCACHED_MAPPING help If you say Y here, physical addressing will be extended to 32-bits through the SH-4A PMB. If this is not set, legacy 29-bit physical addressing will be used. config X2TLB def_bool y depends on (CPU_SHX2 || CPU_SHX3) && MMU config VSYSCALL bool "Support vsyscall page" depends on MMU && (CPU_SH3 || CPU_SH4) default y help This will enable support for the kernel mapping a vDSO page in process space, and subsequently handing down the entry point to the libc through the ELF auxiliary vector. From the kernel side this is used for the signal trampoline. For systems with an MMU that can afford to give up a page, (the default value) say Y. config NUMA bool "Non-Uniform Memory Access (NUMA) Support" depends on MMU && SYS_SUPPORTS_NUMA select ARCH_WANT_NUMA_VARIABLE_LOCALITY default n help Some SH systems have many various memories scattered around the address space, each with varying latencies. This enables support for these blocks by binding them to nodes and allowing memory policies to be used for prioritizing and controlling allocation behaviour. config NODES_SHIFT int default "3" if CPU_SUBTYPE_SHX3 default "1" depends on NUMA config ARCH_FLATMEM_ENABLE def_bool y depends on !NUMA config ARCH_SPARSEMEM_ENABLE def_bool y select SPARSEMEM_STATIC config ARCH_SPARSEMEM_DEFAULT def_bool y config ARCH_SELECT_MEMORY_MODEL def_bool y config ARCH_MEMORY_PROBE def_bool y depends on MEMORY_HOTPLUG config IOREMAP_FIXED def_bool y depends on X2TLB config UNCACHED_MAPPING bool config HAVE_SRAM_POOL bool select GENERIC_ALLOCATOR choice prompt "Kernel page size" default PAGE_SIZE_4KB config PAGE_SIZE_4KB bool "4kB" help This is the default page size used by all SuperH CPUs. config PAGE_SIZE_8KB bool "8kB" depends on !MMU || X2TLB help This enables 8kB pages as supported by SH-X2 and later MMUs. config PAGE_SIZE_16KB bool "16kB" depends on !MMU help This enables 16kB pages on MMU-less SH systems. config PAGE_SIZE_64KB bool "64kB" depends on !MMU || CPU_SH4 help This enables support for 64kB pages, possible on all SH-4 CPUs and later. endchoice choice prompt "HugeTLB page size" depends on HUGETLB_PAGE default HUGETLB_PAGE_SIZE_1MB if PAGE_SIZE_64KB default HUGETLB_PAGE_SIZE_64K config HUGETLB_PAGE_SIZE_64K bool "64kB" depends on !PAGE_SIZE_64KB config HUGETLB_PAGE_SIZE_256K bool "256kB" depends on X2TLB config HUGETLB_PAGE_SIZE_1MB bool "1MB" config HUGETLB_PAGE_SIZE_4MB bool "4MB" depends on X2TLB config HUGETLB_PAGE_SIZE_64MB bool "64MB" depends on X2TLB endchoice config SCHED_MC bool "Multi-core scheduler support" depends on SMP default y help Multi-core scheduler support improves the CPU scheduler's decision making when dealing with multi-core CPU chips at a cost of slightly increased overhead in some places. If unsure say N here. endmenu menu "Cache configuration" config SH7705_CACHE_32KB bool "Enable 32KB cache size for SH7705" depends on CPU_SUBTYPE_SH7705 default y choice prompt "Cache mode" default CACHE_WRITEBACK if CPU_SH2A || CPU_SH3 || CPU_SH4 default CACHE_WRITETHROUGH if (CPU_SH2 && !CPU_SH2A) config CACHE_WRITEBACK bool "Write-back" config CACHE_WRITETHROUGH bool "Write-through" help Selecting this option will configure the caches in write-through mode, as opposed to the default write-back configuration. Since there's sill some aliasing issues on SH-4, this option will unfortunately still require the majority of flushing functions to be implemented to deal with aliasing. If unsure, say N. config CACHE_OFF bool "Off" endchoice endmenu
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