255 lines
6.2 KiB
Plaintext
255 lines
6.2 KiB
Plaintext
# 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
|