1menu "Memory management options"
  2
  3config QUICKLIST
  4	def_bool y
  5
  6config MMU
  7        bool "Support for memory management hardware"
  8	depends on !CPU_SH2
 
 
 
  9	default y
 10	help
 11	  Some SH processors (such as SH-2/SH-2A) lack an MMU. In order to
 12	  boot on these systems, this option must not be set.
 13
 14	  On other systems (such as the SH-3 and 4) where an MMU exists,
 15	  turning this off will boot the kernel on these machines with the
 16	  MMU implicitly switched off.
 17
 
 
 
 
 
 
 
 
 
 18config PAGE_OFFSET
 19	hex
 20	default "0x80000000" if MMU && SUPERH32
 21	default "0x20000000" if MMU && SUPERH64
 22	default "0x00000000"
 23
 24config FORCE_MAX_ZONEORDER
 25	int "Maximum zone order"
 26	range 9 64 if PAGE_SIZE_16KB
 27	default "9" if PAGE_SIZE_16KB
 28	range 7 64 if PAGE_SIZE_64KB
 29	default "7" if PAGE_SIZE_64KB
 30	range 11 64
 31	default "14" if !MMU
 32	default "11"
 33	help
 34	  The kernel memory allocator divides physically contiguous memory
 35	  blocks into "zones", where each zone is a power of two number of
 36	  pages.  This option selects the largest power of two that the kernel
 37	  keeps in the memory allocator.  If you need to allocate very large
 38	  blocks of physically contiguous memory, then you may need to
 39	  increase this value.
 40
 41	  This config option is actually maximum order plus one. For example,
 42	  a value of 11 means that the largest free memory block is 2^10 pages.
 43
 44	  The page size is not necessarily 4KB. Keep this in mind when
 45	  choosing a value for this option.
 46
 
 
 47config MEMORY_START
 48	hex "Physical memory start address"
 49	default "0x08000000"
 50	---help---
 51	  Computers built with Hitachi SuperH processors always
 52	  map the ROM starting at address zero.  But the processor
 53	  does not specify the range that RAM takes.
 54
 55	  The physical memory (RAM) start address will be automatically
 56	  set to 08000000. Other platforms, such as the Solution Engine
 57	  boards typically map RAM at 0C000000.
 58
 59	  Tweak this only when porting to a new machine which does not
 60	  already have a defconfig. Changing it from the known correct
 61	  value on any of the known systems will only lead to disaster.
 62
 63config MEMORY_SIZE
 64	hex "Physical memory size"
 65	default "0x04000000"
 66	help
 67	  This sets the default memory size assumed by your SH kernel. It can
 68	  be overridden as normal by the 'mem=' argument on the kernel command
 69	  line. If unsure, consult your board specifications or just leave it
 70	  as 0x04000000 which was the default value before this became
 71	  configurable.
 72
 73# Physical addressing modes
 74
 75config 29BIT
 76	def_bool !32BIT
 77	depends on SUPERH32
 78	select UNCACHED_MAPPING
 79
 80config 32BIT
 81	bool
 82	default y if CPU_SH5 || !MMU
 83
 84config PMB
 85	bool "Support 32-bit physical addressing through PMB"
 86	depends on MMU && EXPERIMENTAL && CPU_SH4A && !CPU_SH4AL_DSP
 87	select 32BIT
 88	select UNCACHED_MAPPING
 89	help
 90	  If you say Y here, physical addressing will be extended to
 91	  32-bits through the SH-4A PMB. If this is not set, legacy
 92	  29-bit physical addressing will be used.
 93
 94config X2TLB
 95	def_bool y
 96	depends on (CPU_SHX2 || CPU_SHX3) && MMU
 97
 98config VSYSCALL
 99	bool "Support vsyscall page"
100	depends on MMU && (CPU_SH3 || CPU_SH4)
101	default y
102	help
103	  This will enable support for the kernel mapping a vDSO page
104	  in process space, and subsequently handing down the entry point
105	  to the libc through the ELF auxiliary vector.
106
107	  From the kernel side this is used for the signal trampoline.
108	  For systems with an MMU that can afford to give up a page,
109	  (the default value) say Y.
110
111config NUMA
112	bool "Non Uniform Memory Access (NUMA) Support"
113	depends on MMU && SYS_SUPPORTS_NUMA && EXPERIMENTAL
 
114	default n
115	help
116	  Some SH systems have many various memories scattered around
117	  the address space, each with varying latencies. This enables
118	  support for these blocks by binding them to nodes and allowing
119	  memory policies to be used for prioritizing and controlling
120	  allocation behaviour.
121
122config NODES_SHIFT
123	int
124	default "3" if CPU_SUBTYPE_SHX3
125	default "1"
126	depends on NEED_MULTIPLE_NODES
127
128config ARCH_FLATMEM_ENABLE
129	def_bool y
130	depends on !NUMA
131
132config ARCH_SPARSEMEM_ENABLE
133	def_bool y
134	select SPARSEMEM_STATIC
135
136config ARCH_SPARSEMEM_DEFAULT
137	def_bool y
138
139config MAX_ACTIVE_REGIONS
140	int
141	default "6" if (CPU_SUBTYPE_SHX3 && SPARSEMEM)
142	default "2" if SPARSEMEM && (CPU_SUBTYPE_SH7722 || \
143		       CPU_SUBTYPE_SH7785)
144	default "1"
145
146config ARCH_SELECT_MEMORY_MODEL
147	def_bool y
148
149config ARCH_ENABLE_MEMORY_HOTPLUG
150	def_bool y
151	depends on SPARSEMEM && MMU
152
153config ARCH_ENABLE_MEMORY_HOTREMOVE
154	def_bool y
155	depends on SPARSEMEM && MMU
156
157config ARCH_MEMORY_PROBE
158	def_bool y
159	depends on MEMORY_HOTPLUG
160
161config IOREMAP_FIXED
162       def_bool y
163       depends on X2TLB || SUPERH64
164
165config UNCACHED_MAPPING
166	bool
167
168config HAVE_SRAM_POOL
169	bool
170	select GENERIC_ALLOCATOR
171
172choice
173	prompt "Kernel page size"
174	default PAGE_SIZE_4KB
175
176config PAGE_SIZE_4KB
177	bool "4kB"
178	help
179	  This is the default page size used by all SuperH CPUs.
180
181config PAGE_SIZE_8KB
182	bool "8kB"
183	depends on !MMU || X2TLB
184	help
185	  This enables 8kB pages as supported by SH-X2 and later MMUs.
186
187config PAGE_SIZE_16KB
188	bool "16kB"
189	depends on !MMU
190	help
191	  This enables 16kB pages on MMU-less SH systems.
192
193config PAGE_SIZE_64KB
194	bool "64kB"
195	depends on !MMU || CPU_SH4 || CPU_SH5
196	help
197	  This enables support for 64kB pages, possible on all SH-4
198	  CPUs and later.
199
200endchoice
201
202choice
203	prompt "HugeTLB page size"
204	depends on HUGETLB_PAGE
205	default HUGETLB_PAGE_SIZE_1MB if PAGE_SIZE_64KB
206	default HUGETLB_PAGE_SIZE_64K
207
208config HUGETLB_PAGE_SIZE_64K
209	bool "64kB"
210	depends on !PAGE_SIZE_64KB
211
212config HUGETLB_PAGE_SIZE_256K
213	bool "256kB"
214	depends on X2TLB
215
216config HUGETLB_PAGE_SIZE_1MB
217	bool "1MB"
218
219config HUGETLB_PAGE_SIZE_4MB
220	bool "4MB"
221	depends on X2TLB
222
223config HUGETLB_PAGE_SIZE_64MB
224	bool "64MB"
225	depends on X2TLB
226
227config HUGETLB_PAGE_SIZE_512MB
228	bool "512MB"
229	depends on CPU_SH5
230
231endchoice
232
233source "mm/Kconfig"
234
235config SCHED_MC
236	bool "Multi-core scheduler support"
237	depends on SMP
238	default y
239	help
240	  Multi-core scheduler support improves the CPU scheduler's decision
241	  making when dealing with multi-core CPU chips at a cost of slightly
242	  increased overhead in some places. If unsure say N here.
243
244endmenu
245
246menu "Cache configuration"
247
248config SH7705_CACHE_32KB
249	bool "Enable 32KB cache size for SH7705"
250	depends on CPU_SUBTYPE_SH7705
251	default y
252
253choice
254	prompt "Cache mode"
255	default CACHE_WRITEBACK if CPU_SH2A || CPU_SH3 || CPU_SH4 || CPU_SH5
256	default CACHE_WRITETHROUGH if (CPU_SH2 && !CPU_SH2A)
257
258config CACHE_WRITEBACK
259	bool "Write-back"
260
261config CACHE_WRITETHROUGH
262	bool "Write-through"
263	help
264	  Selecting this option will configure the caches in write-through
265	  mode, as opposed to the default write-back configuration.
266
267	  Since there's sill some aliasing issues on SH-4, this option will
268	  unfortunately still require the majority of flushing functions to
269	  be implemented to deal with aliasing.
270
271	  If unsure, say N.
272
273config CACHE_OFF
274	bool "Off"
275
276endchoice
277
278endmenu

  1# SPDX-License-Identifier: GPL-2.0
  2menu "Memory management options"
  3
 
 
 
  4config MMU
  5        bool "Support for memory management hardware"
  6	depends on !CPU_SH2
  7	select HAVE_PAGE_SIZE_4KB
  8	select HAVE_PAGE_SIZE_8KB if X2TLB
  9	select HAVE_PAGE_SIZE_64KB if CPU_SH4
 10	default y
 11	help
 12	  Some SH processors (such as SH-2/SH-2A) lack an MMU. In order to
 13	  boot on these systems, this option must not be set.
 14
 15	  On other systems (such as the SH-3 and 4) where an MMU exists,
 16	  turning this off will boot the kernel on these machines with the
 17	  MMU implicitly switched off.
 18
 19config NOMMU
 20	def_bool !MMU
 21	select HAVE_PAGE_SIZE_4KB
 22	select HAVE_PAGE_SIZE_8KB
 23	select HAVE_PAGE_SIZE_16KB
 24	select HAVE_PAGE_SIZE_64KB
 25	help
 26	  On MMU-less systems, any of these page sizes can be selected
 27
 28config PAGE_OFFSET
 29	hex
 30	default "0x80000000" if MMU
 
 31	default "0x00000000"
 32
 33config ARCH_FORCE_MAX_ORDER
 34	int "Order of maximal physically contiguous allocations"
 35	default "8" if PAGE_SIZE_16KB
 36	default "6" if PAGE_SIZE_64KB
 37	default "13" if !MMU
 38	default "10"
 39	help
 40	  The kernel page allocator limits the size of maximal physically
 41	  contiguous allocations. The limit is called MAX_PAGE:_ORDER and it
 42	  defines the maximal power of two of number of pages that can be
 43	  allocated as a single contiguous block. This option allows
 44	  overriding the default setting when ability to allocate very
 45	  large blocks of physically contiguous memory is required.
 
 
 
 
 
 
 46
 47	  The page size is not necessarily 4KB. Keep this in mind when
 48	  choosing a value for this option.
 49
 50	  Don't change if unsure.
 51
 52config MEMORY_START
 53	hex "Physical memory start address"
 54	default "0x08000000"
 55	help
 56	  Computers built with Hitachi SuperH processors always
 57	  map the ROM starting at address zero.  But the processor
 58	  does not specify the range that RAM takes.
 59
 60	  The physical memory (RAM) start address will be automatically
 61	  set to 08000000. Other platforms, such as the Solution Engine
 62	  boards typically map RAM at 0C000000.
 63
 64	  Tweak this only when porting to a new machine which does not
 65	  already have a defconfig. Changing it from the known correct
 66	  value on any of the known systems will only lead to disaster.
 67
 68config MEMORY_SIZE
 69	hex "Physical memory size"
 70	default "0x04000000"
 71	help
 72	  This sets the default memory size assumed by your SH kernel. It can
 73	  be overridden as normal by the 'mem=' argument on the kernel command
 74	  line. If unsure, consult your board specifications or just leave it
 75	  as 0x04000000 which was the default value before this became
 76	  configurable.
 77
 78# Physical addressing modes
 79
 80config 29BIT
 81	def_bool !32BIT
 
 82	select UNCACHED_MAPPING
 83
 84config 32BIT
 85	bool
 86	default !MMU
 87
 88config PMB
 89	bool "Support 32-bit physical addressing through PMB"
 90	depends on MMU && CPU_SH4A && !CPU_SH4AL_DSP
 91	select 32BIT
 92	select UNCACHED_MAPPING
 93	help
 94	  If you say Y here, physical addressing will be extended to
 95	  32-bits through the SH-4A PMB. If this is not set, legacy
 96	  29-bit physical addressing will be used.
 97
 98config X2TLB
 99	def_bool y
100	depends on (CPU_SHX2 || CPU_SHX3) && MMU
101
102config VSYSCALL
103	bool "Support vsyscall page"
104	depends on MMU && (CPU_SH3 || CPU_SH4)
105	default y
106	help
107	  This will enable support for the kernel mapping a vDSO page
108	  in process space, and subsequently handing down the entry point
109	  to the libc through the ELF auxiliary vector.
110
111	  From the kernel side this is used for the signal trampoline.
112	  For systems with an MMU that can afford to give up a page,
113	  (the default value) say Y.
114
115config NUMA
116	bool "Non-Uniform Memory Access (NUMA) Support"
117	depends on MMU && SYS_SUPPORTS_NUMA
118	select ARCH_WANT_NUMA_VARIABLE_LOCALITY
119	default n
120	help
121	  Some SH systems have many various memories scattered around
122	  the address space, each with varying latencies. This enables
123	  support for these blocks by binding them to nodes and allowing
124	  memory policies to be used for prioritizing and controlling
125	  allocation behaviour.
126
127config NODES_SHIFT
128	int
129	default "3" if CPU_SUBTYPE_SHX3
130	default "1"
131	depends on NUMA
132
133config ARCH_FLATMEM_ENABLE
134	def_bool y
135	depends on !NUMA
136
137config ARCH_SPARSEMEM_ENABLE
138	def_bool y
139	select SPARSEMEM_STATIC
140
141config ARCH_SPARSEMEM_DEFAULT
142	def_bool y
143
 
 
 
 
 
 
 
144config ARCH_SELECT_MEMORY_MODEL
145	def_bool y
146
 
 
 
 
 
 
 
 
 
 
 
 
147config IOREMAP_FIXED
148       def_bool y
149       depends on X2TLB
150
151config UNCACHED_MAPPING
152	bool
153
154config HAVE_SRAM_POOL
155	bool
156	select GENERIC_ALLOCATOR
157
158choice
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
159	prompt "HugeTLB page size"
160	depends on HUGETLB_PAGE
161	default HUGETLB_PAGE_SIZE_1MB if PAGE_SIZE_64KB
162	default HUGETLB_PAGE_SIZE_64K
163
164config HUGETLB_PAGE_SIZE_64K
165	bool "64kB"
166	depends on !PAGE_SIZE_64KB
167
168config HUGETLB_PAGE_SIZE_256K
169	bool "256kB"
170	depends on X2TLB
171
172config HUGETLB_PAGE_SIZE_1MB
173	bool "1MB"
174
175config HUGETLB_PAGE_SIZE_4MB
176	bool "4MB"
177	depends on X2TLB
178
179config HUGETLB_PAGE_SIZE_64MB
180	bool "64MB"
181	depends on X2TLB
182
 
 
 
 
183endchoice
184
 
 
185config SCHED_MC
186	bool "Multi-core scheduler support"
187	depends on SMP
188	default y
189	help
190	  Multi-core scheduler support improves the CPU scheduler's decision
191	  making when dealing with multi-core CPU chips at a cost of slightly
192	  increased overhead in some places. If unsure say N here.
193
194endmenu
195
196menu "Cache configuration"
197
198config SH7705_CACHE_32KB
199	bool "Enable 32KB cache size for SH7705"
200	depends on CPU_SUBTYPE_SH7705
201	default y
202
203choice
204	prompt "Cache mode"
205	default CACHE_WRITEBACK if CPU_SH2A || CPU_SH3 || CPU_SH4
206	default CACHE_WRITETHROUGH if (CPU_SH2 && !CPU_SH2A)
207
208config CACHE_WRITEBACK
209	bool "Write-back"
210
211config CACHE_WRITETHROUGH
212	bool "Write-through"
213	help
214	  Selecting this option will configure the caches in write-through
215	  mode, as opposed to the default write-back configuration.
216
217	  Since there's sill some aliasing issues on SH-4, this option will
218	  unfortunately still require the majority of flushing functions to
219	  be implemented to deal with aliasing.
220
221	  If unsure, say N.
222
223config CACHE_OFF
224	bool "Off"
225
226endchoice
227
228endmenu