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2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d 
 kernel/arch/xtensa/Kconfig
....@@ -1,26 +1,31 @@
11 # SPDX-License-Identifier: GPL-2.0
2
-config ZONE_DMA
3
-	def_bool y
4
-
52 config XTENSA
63 	def_bool y
7
-	select ARCH_HAS_SG_CHAIN
8
-	select ARCH_HAS_SYNC_DMA_FOR_CPU
9
-	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
10
-	select ARCH_NO_COHERENT_DMA_MMAP if !MMU
4
+	select ARCH_32BIT_OFF_T
5
+	select ARCH_HAS_BINFMT_FLAT if !MMU
6
+	select ARCH_HAS_DMA_PREP_COHERENT if MMU
7
+	select ARCH_HAS_SYNC_DMA_FOR_CPU if MMU
8
+	select ARCH_HAS_SYNC_DMA_FOR_DEVICE if MMU
9
+	select ARCH_HAS_DMA_SET_UNCACHED if MMU
10
+	select ARCH_USE_QUEUED_RWLOCKS
11
+	select ARCH_USE_QUEUED_SPINLOCKS
1112 	select ARCH_WANT_FRAME_POINTERS
1213 	select ARCH_WANT_IPC_PARSE_VERSION
13
-	select BUILDTIME_EXTABLE_SORT
14
+	select BUILDTIME_TABLE_SORT
1415 	select CLONE_BACKWARDS
1516 	select COMMON_CLK
16
-	select DMA_NONCOHERENT_OPS
17
+	select DMA_REMAP if MMU
1718 	select GENERIC_ATOMIC64
1819 	select GENERIC_CLOCKEVENTS
1920 	select GENERIC_IRQ_SHOW
2021 	select GENERIC_PCI_IOMAP
2122 	select GENERIC_SCHED_CLOCK
2223 	select GENERIC_STRNCPY_FROM_USER if KASAN
23
-	select HAVE_ARCH_KASAN if MMU
24
+	select HAVE_ARCH_AUDITSYSCALL
25
+	select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
26
+	select HAVE_ARCH_KASAN if MMU && !XIP_KERNEL
27
+	select HAVE_ARCH_SECCOMP_FILTER
28
+	select HAVE_ARCH_TRACEHOOK
2429 	select HAVE_DEBUG_KMEMLEAK
2530 	select HAVE_DMA_CONTIGUOUS
2631 	select HAVE_EXIT_THREAD
....@@ -28,14 +33,15 @@
2833 	select HAVE_FUTEX_CMPXCHG if !MMU && FUTEX
2934 	select HAVE_HW_BREAKPOINT if PERF_EVENTS
3035 	select HAVE_IRQ_TIME_ACCOUNTING
31
-	select HAVE_MEMBLOCK
3236 	select HAVE_OPROFILE
37
+	select HAVE_PCI
3338 	select HAVE_PERF_EVENTS
3439 	select HAVE_STACKPROTECTOR
40
+	select HAVE_SYSCALL_TRACEPOINTS
3541 	select IRQ_DOMAIN
3642 	select MODULES_USE_ELF_RELA
37
-	select NO_BOOTMEM
3843 	select PERF_USE_VMALLOC
44
+	select SET_FS
3945 	select VIRT_TO_BUS
4046 	help
4147 	  Xtensa processors are 32-bit RISC machines designed by Tensilica
....@@ -44,9 +50,6 @@
4450 	  architecture supports all processor configurations and extensions,
4551 	  with reasonable minimum requirements.  The Xtensa Linux project has
4652 	  a home page at <http://www.linux-xtensa.org/>.
47
-
48
-config RWSEM_XCHGADD_ALGORITHM
49
-	def_bool y
5053 
5154 config GENERIC_HWEIGHT
5255 	def_bool y
....@@ -121,7 +124,7 @@
121124 	help
122125 	  Provide the name of a custom Xtensa processor variant.
123126 	  This CORENAME selects arch/xtensa/variant/CORENAME.
124
-	  Dont forget you have to select MMU if you have one.
127
+	  Don't forget you have to select MMU if you have one.
125128 
126129 config XTENSA_VARIANT_NAME
127130 	string
....@@ -166,7 +169,7 @@
166169 	  If unsure, say N.
167170 
168171 config XTENSA_UNALIGNED_USER
169
-	bool "Unaligned memory access in use space"
172
+	bool "Unaligned memory access in user space"
170173 	help
171174 	  The Xtensa architecture currently does not handle unaligned
172175 	  memory accesses in hardware but through an exception handler.
....@@ -179,11 +182,11 @@
179182 	depends on XTENSA_VARIANT_CUSTOM
180183 	select XTENSA_MX
181184 	help
182
-	  This option is use to indicate that the system-on-a-chip (SOC)
185
+	  This option is used to indicate that the system-on-a-chip (SOC)
183186 	  supports Multiprocessing. Multiprocessor support implemented above
184187 	  the CPU core definition and currently needs to be selected manually.
185188 
186
-	  Multiprocessor support in implemented with external cache and
189
+	  Multiprocessor support is implemented with external cache and
187190 	  interrupt controllers.
188191 
189192 	  The MX interrupt distributer adds Interprocessor Interrupts
....@@ -215,137 +218,6 @@
215218 
216219 	  Say N if you want to disable CPU hotplug.
217220 
218
-config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
219
-	bool "Initialize Xtensa MMU inside the Linux kernel code"
220
-	depends on !XTENSA_VARIANT_FSF && !XTENSA_VARIANT_DC232B
221
-	default y if XTENSA_VARIANT_DC233C || XTENSA_VARIANT_CUSTOM
222
-	help
223
-	  Earlier version initialized the MMU in the exception vector
224
-	  before jumping to _startup in head.S and had an advantage that
225
-	  it was possible to place a software breakpoint at 'reset' and
226
-	  then enter your normal kernel breakpoints once the MMU was mapped
227
-	  to the kernel mappings (0XC0000000).
228
-
229
-	  This unfortunately won't work for U-Boot and likely also wont
230
-	  work for using KEXEC to have a hot kernel ready for doing a
231
-	  KDUMP.
232
-
233
-	  So now the MMU is initialized in head.S but it's necessary to
234
-	  use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
235
-	  xt-gdb can't place a Software Breakpoint in the  0XD region prior
236
-	  to mapping the MMU and after mapping even if the area of low memory
237
-	  was mapped gdb wouldn't remove the breakpoint on hitting it as the
238
-	  PC wouldn't match. Since Hardware Breakpoints are recommended for
239
-	  Linux configurations it seems reasonable to just assume they exist
240
-	  and leave this older mechanism for unfortunate souls that choose
241
-	  not to follow Tensilica's recommendation.
242
-
243
-	  Selecting this will cause U-Boot to set the KERNEL Load and Entry
244
-	  address at 0x00003000 instead of the mapped std of 0xD0003000.
245
-
246
-	  If in doubt, say Y.
247
-
248
-config MEMMAP_CACHEATTR
249
-	hex "Cache attributes for the memory address space"
250
-	depends on !MMU
251
-	default 0x22222222
252
-	help
253
-	  These cache attributes are set up for noMMU systems. Each hex digit
254
-	  specifies cache attributes for the corresponding 512MB memory
255
-	  region: bits 0..3 -- for addresses 0x00000000..0x1fffffff,
256
-	  bits 4..7 -- for addresses 0x20000000..0x3fffffff, and so on.
257
-
258
-	  Cache attribute values are specific for the MMU type, so e.g.
259
-	  for region protection MMUs: 2 is cache bypass, 4 is WB cached,
260
-	  1 is WT cached, f is illegal. For ful MMU: bit 0 makes it executable,
261
-	  bit 1 makes it writable, bits 2..3 meaning is 0: cache bypass,
262
-	  1: WB cache, 2: WT cache, 3: special (c and e are illegal, f is
263
-	  reserved).
264
-
265
-config KSEG_PADDR
266
-	hex "Physical address of the KSEG mapping"
267
-	depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX && MMU
268
-	default 0x00000000
269
-	help
270
-	  This is the physical address where KSEG is mapped. Please refer to
271
-	  the chosen KSEG layout help for the required address alignment.
272
-	  Unpacked kernel image (including vectors) must be located completely
273
-	  within KSEG.
274
-	  Physical memory below this address is not available to linux.
275
-
276
-	  If unsure, leave the default value here.
277
-
278
-config KERNEL_LOAD_ADDRESS
279
-	hex "Kernel load address"
280
-	default 0x60003000 if !MMU
281
-	default 0x00003000 if MMU && INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
282
-	default 0xd0003000 if MMU && !INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
283
-	help
284
-	  This is the address where the kernel is loaded.
285
-	  It is virtual address for MMUv2 configurations and physical address
286
-	  for all other configurations.
287
-
288
-	  If unsure, leave the default value here.
289
-
290
-config VECTORS_OFFSET
291
-	hex "Kernel vectors offset"
292
-	default 0x00003000
293
-	help
294
-	  This is the offset of the kernel image from the relocatable vectors
295
-	  base.
296
-
297
-	  If unsure, leave the default value here.
298
-
299
-choice
300
-	prompt "KSEG layout"
301
-	depends on MMU
302
-	default XTENSA_KSEG_MMU_V2
303
-
304
-config XTENSA_KSEG_MMU_V2
305
-	bool "MMUv2: 128MB cached + 128MB uncached"
306
-	help
307
-	  MMUv2 compatible kernel memory map: TLB way 5 maps 128MB starting
308
-	  at KSEG_PADDR to 0xd0000000 with cache and to 0xd8000000
309
-	  without cache.
310
-	  KSEG_PADDR must be aligned to 128MB.
311
-
312
-config XTENSA_KSEG_256M
313
-	bool "256MB cached + 256MB uncached"
314
-	depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
315
-	help
316
-	  TLB way 6 maps 256MB starting at KSEG_PADDR to 0xb0000000
317
-	  with cache and to 0xc0000000 without cache.
318
-	  KSEG_PADDR must be aligned to 256MB.
319
-
320
-config XTENSA_KSEG_512M
321
-	bool "512MB cached + 512MB uncached"
322
-	depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
323
-	help
324
-	  TLB way 6 maps 512MB starting at KSEG_PADDR to 0xa0000000
325
-	  with cache and to 0xc0000000 without cache.
326
-	  KSEG_PADDR must be aligned to 256MB.
327
-
328
-endchoice
329
-
330
-config HIGHMEM
331
-	bool "High Memory Support"
332
-	depends on MMU
333
-	help
334
-	  Linux can use the full amount of RAM in the system by
335
-	  default. However, the default MMUv2 setup only maps the
336
-	  lowermost 128 MB of memory linearly to the areas starting
337
-	  at 0xd0000000 (cached) and 0xd8000000 (uncached).
338
-	  When there are more than 128 MB memory in the system not
339
-	  all of it can be "permanently mapped" by the kernel.
340
-	  The physical memory that's not permanently mapped is called
341
-	  "high memory".
342
-
343
-	  If you are compiling a kernel which will never run on a
344
-	  machine with more than 128 MB total physical RAM, answer
345
-	  N here.
346
-
347
-	  If unsure, say Y.
348
-
349221 config FAST_SYSCALL_XTENSA
350222 	bool "Enable fast atomic syscalls"
351223 	default n
....@@ -372,6 +244,54 @@
372244 
373245 	  If unsure, say N.
374246 
247
+config USER_ABI_CALL0
248
+	bool
249
+
250
+choice
251
+	prompt "Userspace ABI"
252
+	default USER_ABI_DEFAULT
253
+	help
254
+	  Select supported userspace ABI.
255
+
256
+	  If unsure, choose the default ABI.
257
+
258
+config USER_ABI_DEFAULT
259
+	bool "Default ABI only"
260
+	help
261
+	  Assume default userspace ABI. For XEA2 cores it is windowed ABI.
262
+	  call0 ABI binaries may be run on such kernel, but signal delivery
263
+	  will not work correctly for them.
264
+
265
+config USER_ABI_CALL0_ONLY
266
+	bool "Call0 ABI only"
267
+	select USER_ABI_CALL0
268
+	help
269
+	  Select this option to support only call0 ABI in userspace.
270
+	  Windowed ABI binaries will crash with a segfault caused by
271
+	  an illegal instruction exception on the first 'entry' opcode.
272
+
273
+	  Choose this option if you're planning to run only user code
274
+	  built with call0 ABI.
275
+
276
+config USER_ABI_CALL0_PROBE
277
+	bool "Support both windowed and call0 ABI by probing"
278
+	select USER_ABI_CALL0
279
+	help
280
+	  Select this option to support both windowed and call0 userspace
281
+	  ABIs. When enabled all processes are started with PS.WOE disabled
282
+	  and a fast user exception handler for an illegal instruction is
283
+	  used to turn on PS.WOE bit on the first 'entry' opcode executed by
284
+	  the userspace.
285
+
286
+	  This option should be enabled for the kernel that must support
287
+	  both call0 and windowed ABIs in userspace at the same time.
288
+
289
+	  Note that Xtensa ISA does not guarantee that entry opcode will
290
+	  raise an illegal instruction exception on cores with XEA2 when
291
+	  PS.WOE is disabled, check whether the target core supports it.
292
+
293
+endchoice
294
+
375295 endmenu
376296 
377297 config XTENSA_CALIBRATE_CCOUNT
....@@ -384,20 +304,8 @@
384304 config SERIAL_CONSOLE
385305 	def_bool n
386306 
387
-menu "Bus options"
388
-
389
-config PCI
390
-	bool "PCI support"
391
-	default y
392
-	help
393
-	  Find out whether you have a PCI motherboard. PCI is the name of a
394
-	  bus system, i.e. the way the CPU talks to the other stuff inside
395
-	  your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
396
-	  VESA. If you have PCI, say Y, otherwise N.
397
-
398
-source "drivers/pci/Kconfig"
399
-
400
-endmenu
307
+config PLATFORM_HAVE_XIP
308
+	def_bool n
401309 
402310 menu "Platform options"
403311 
....@@ -425,6 +333,7 @@
425333 	select PLATFORM_WANT_DEFAULT_MEM if !MMU
426334 	select SERIAL_CONSOLE
427335 	select XTENSA_CALIBRATE_CCOUNT
336
+	select PLATFORM_HAVE_XIP
428337 	help
429338 	  XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
430339 	  This hardware is capable of running a full Linux distribution.
....@@ -464,11 +373,10 @@
464373 	bool "Flattened Device Tree support"
465374 	select OF
466375 	select OF_EARLY_FLATTREE
467
-	select OF_RESERVED_MEM
468376 	help
469377 	  Include support for flattened device tree machine descriptions.
470378 
471
-config BUILTIN_DTB
379
+config BUILTIN_DTB_SOURCE
472380 	string "DTB to build into the kernel image"
473381 	depends on OF
474382 
....@@ -517,36 +425,6 @@
517425 	  Another simulated disk in a host file for a buildroot-independent
518426 	  storage.
519427 
520
-config FORCE_MAX_ZONEORDER
521
-	int "Maximum zone order"
522
-	default "11"
523
-	help
524
-	  The kernel memory allocator divides physically contiguous memory
525
-	  blocks into "zones", where each zone is a power of two number of
526
-	  pages.  This option selects the largest power of two that the kernel
527
-	  keeps in the memory allocator.  If you need to allocate very large
528
-	  blocks of physically contiguous memory, then you may need to
529
-	  increase this value.
530
-
531
-	  This config option is actually maximum order plus one. For example,
532
-	  a value of 11 means that the largest free memory block is 2^10 pages.
533
-
534
-source "drivers/pcmcia/Kconfig"
535
-
536
-config PLATFORM_WANT_DEFAULT_MEM
537
-	def_bool n
538
-
539
-config DEFAULT_MEM_START
540
-	hex
541
-	prompt "PAGE_OFFSET/PHYS_OFFSET" if !MMU && PLATFORM_WANT_DEFAULT_MEM
542
-	default 0x60000000 if PLATFORM_WANT_DEFAULT_MEM
543
-	default 0x00000000
544
-	help
545
-	  This is the base address used for both PAGE_OFFSET and PHYS_OFFSET
546
-	  in noMMU configurations.
547
-
548
-	  If unsure, leave the default value here.
549
-
550428 config XTFPGA_LCD
551429 	bool "Enable XTFPGA LCD driver"
552430 	depends on XTENSA_PLATFORM_XTFPGA
....@@ -577,6 +455,248 @@
577455 	  only be used with 8-bit interface. Please consult prototyping user
578456 	  guide for your board for the correct interface width.
579457 
458
+comment "Kernel memory layout"
459
+
460
+config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
461
+	bool "Initialize Xtensa MMU inside the Linux kernel code"
462
+	depends on !XTENSA_VARIANT_FSF && !XTENSA_VARIANT_DC232B
463
+	default y if XTENSA_VARIANT_DC233C || XTENSA_VARIANT_CUSTOM
464
+	help
465
+	  Earlier version initialized the MMU in the exception vector
466
+	  before jumping to _startup in head.S and had an advantage that
467
+	  it was possible to place a software breakpoint at 'reset' and
468
+	  then enter your normal kernel breakpoints once the MMU was mapped
469
+	  to the kernel mappings (0XC0000000).
470
+
471
+	  This unfortunately won't work for U-Boot and likely also wont
472
+	  work for using KEXEC to have a hot kernel ready for doing a
473
+	  KDUMP.
474
+
475
+	  So now the MMU is initialized in head.S but it's necessary to
476
+	  use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
477
+	  xt-gdb can't place a Software Breakpoint in the  0XD region prior
478
+	  to mapping the MMU and after mapping even if the area of low memory
479
+	  was mapped gdb wouldn't remove the breakpoint on hitting it as the
480
+	  PC wouldn't match. Since Hardware Breakpoints are recommended for
481
+	  Linux configurations it seems reasonable to just assume they exist
482
+	  and leave this older mechanism for unfortunate souls that choose
483
+	  not to follow Tensilica's recommendation.
484
+
485
+	  Selecting this will cause U-Boot to set the KERNEL Load and Entry
486
+	  address at 0x00003000 instead of the mapped std of 0xD0003000.
487
+
488
+	  If in doubt, say Y.
489
+
490
+config XIP_KERNEL
491
+	bool "Kernel Execute-In-Place from ROM"
492
+	depends on PLATFORM_HAVE_XIP
493
+	help
494
+	  Execute-In-Place allows the kernel to run from non-volatile storage
495
+	  directly addressable by the CPU, such as NOR flash. This saves RAM
496
+	  space since the text section of the kernel is not loaded from flash
497
+	  to RAM. Read-write sections, such as the data section and stack,
498
+	  are still copied to RAM. The XIP kernel is not compressed since
499
+	  it has to run directly from flash, so it will take more space to
500
+	  store it. The flash address used to link the kernel object files,
501
+	  and for storing it, is configuration dependent. Therefore, if you
502
+	  say Y here, you must know the proper physical address where to
503
+	  store the kernel image depending on your own flash memory usage.
504
+
505
+	  Also note that the make target becomes "make xipImage" rather than
506
+	  "make Image" or "make uImage". The final kernel binary to put in
507
+	  ROM memory will be arch/xtensa/boot/xipImage.
508
+
509
+	  If unsure, say N.
510
+
511
+config MEMMAP_CACHEATTR
512
+	hex "Cache attributes for the memory address space"
513
+	depends on !MMU
514
+	default 0x22222222
515
+	help
516
+	  These cache attributes are set up for noMMU systems. Each hex digit
517
+	  specifies cache attributes for the corresponding 512MB memory
518
+	  region: bits 0..3 -- for addresses 0x00000000..0x1fffffff,
519
+	  bits 4..7 -- for addresses 0x20000000..0x3fffffff, and so on.
520
+
521
+	  Cache attribute values are specific for the MMU type.
522
+	  For region protection MMUs:
523
+	    1: WT cached,
524
+	    2: cache bypass,
525
+	    4: WB cached,
526
+	    f: illegal.
527
+	  For full MMU:
528
+	    bit 0: executable,
529
+	    bit 1: writable,
530
+	    bits 2..3:
531
+	      0: cache bypass,
532
+	      1: WB cache,
533
+	      2: WT cache,
534
+	      3: special (c and e are illegal, f is reserved).
535
+	  For MPU:
536
+	    0: illegal,
537
+	    1: WB cache,
538
+	    2: WB, no-write-allocate cache,
539
+	    3: WT cache,
540
+	    4: cache bypass.
541
+
542
+config KSEG_PADDR
543
+	hex "Physical address of the KSEG mapping"
544
+	depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX && MMU
545
+	default 0x00000000
546
+	help
547
+	  This is the physical address where KSEG is mapped. Please refer to
548
+	  the chosen KSEG layout help for the required address alignment.
549
+	  Unpacked kernel image (including vectors) must be located completely
550
+	  within KSEG.
551
+	  Physical memory below this address is not available to linux.
552
+
553
+	  If unsure, leave the default value here.
554
+
555
+config KERNEL_VIRTUAL_ADDRESS
556
+	hex "Kernel virtual address"
557
+	depends on MMU && XIP_KERNEL
558
+	default 0xd0003000
559
+	help
560
+	  This is the virtual address where the XIP kernel is mapped.
561
+	  XIP kernel may be mapped into KSEG or KIO region, virtual address
562
+	  provided here must match kernel load address provided in
563
+	  KERNEL_LOAD_ADDRESS.
564
+
565
+config KERNEL_LOAD_ADDRESS
566
+	hex "Kernel load address"
567
+	default 0x60003000 if !MMU
568
+	default 0x00003000 if MMU && INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
569
+	default 0xd0003000 if MMU && !INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
570
+	help
571
+	  This is the address where the kernel is loaded.
572
+	  It is virtual address for MMUv2 configurations and physical address
573
+	  for all other configurations.
574
+
575
+	  If unsure, leave the default value here.
576
+
577
+choice
578
+	prompt "Relocatable vectors location"
579
+	default XTENSA_VECTORS_IN_TEXT
580
+	help
581
+	  Choose whether relocatable vectors are merged into the kernel .text
582
+	  or placed separately at runtime. This option does not affect
583
+	  configurations without VECBASE register where vectors are always
584
+	  placed at their hardware-defined locations.
585
+
586
+config XTENSA_VECTORS_IN_TEXT
587
+	bool "Merge relocatable vectors into kernel text"
588
+	depends on !MTD_XIP
589
+	help
590
+	  This option puts relocatable vectors into the kernel .text section
591
+	  with proper alignment.
592
+	  This is a safe choice for most configurations.
593
+
594
+config XTENSA_VECTORS_SEPARATE
595
+	bool "Put relocatable vectors at fixed address"
596
+	help
597
+	  This option puts relocatable vectors at specific virtual address.
598
+	  Vectors are merged with the .init data in the kernel image and
599
+	  are copied into their designated location during kernel startup.
600
+	  Use it to put vectors into IRAM or out of FLASH on kernels with
601
+	  XIP-aware MTD support.
602
+
603
+endchoice
604
+
605
+config VECTORS_ADDR
606
+	hex "Kernel vectors virtual address"
607
+	default 0x00000000
608
+	depends on XTENSA_VECTORS_SEPARATE
609
+	help
610
+	  This is the virtual address of the (relocatable) vectors base.
611
+	  It must be within KSEG if MMU is used.
612
+
613
+config XIP_DATA_ADDR
614
+	hex "XIP kernel data virtual address"
615
+	depends on XIP_KERNEL
616
+	default 0x00000000
617
+	help
618
+	  This is the virtual address where XIP kernel data is copied.
619
+	  It must be within KSEG if MMU is used.
620
+
621
+config PLATFORM_WANT_DEFAULT_MEM
622
+	def_bool n
623
+
624
+config DEFAULT_MEM_START
625
+	hex
626
+	prompt "PAGE_OFFSET/PHYS_OFFSET" if !MMU && PLATFORM_WANT_DEFAULT_MEM
627
+	default 0x60000000 if PLATFORM_WANT_DEFAULT_MEM
628
+	default 0x00000000
629
+	help
630
+	  This is the base address used for both PAGE_OFFSET and PHYS_OFFSET
631
+	  in noMMU configurations.
632
+
633
+	  If unsure, leave the default value here.
634
+
635
+choice
636
+	prompt "KSEG layout"
637
+	depends on MMU
638
+	default XTENSA_KSEG_MMU_V2
639
+
640
+config XTENSA_KSEG_MMU_V2
641
+	bool "MMUv2: 128MB cached + 128MB uncached"
642
+	help
643
+	  MMUv2 compatible kernel memory map: TLB way 5 maps 128MB starting
644
+	  at KSEG_PADDR to 0xd0000000 with cache and to 0xd8000000
645
+	  without cache.
646
+	  KSEG_PADDR must be aligned to 128MB.
647
+
648
+config XTENSA_KSEG_256M
649
+	bool "256MB cached + 256MB uncached"
650
+	depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
651
+	help
652
+	  TLB way 6 maps 256MB starting at KSEG_PADDR to 0xb0000000
653
+	  with cache and to 0xc0000000 without cache.
654
+	  KSEG_PADDR must be aligned to 256MB.
655
+
656
+config XTENSA_KSEG_512M
657
+	bool "512MB cached + 512MB uncached"
658
+	depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
659
+	help
660
+	  TLB way 6 maps 512MB starting at KSEG_PADDR to 0xa0000000
661
+	  with cache and to 0xc0000000 without cache.
662
+	  KSEG_PADDR must be aligned to 256MB.
663
+
664
+endchoice
665
+
666
+config HIGHMEM
667
+	bool "High Memory Support"
668
+	depends on MMU
669
+	select KMAP_LOCAL
670
+	help
671
+	  Linux can use the full amount of RAM in the system by
672
+	  default. However, the default MMUv2 setup only maps the
673
+	  lowermost 128 MB of memory linearly to the areas starting
674
+	  at 0xd0000000 (cached) and 0xd8000000 (uncached).
675
+	  When there are more than 128 MB memory in the system not
676
+	  all of it can be "permanently mapped" by the kernel.
677
+	  The physical memory that's not permanently mapped is called
678
+	  "high memory".
679
+
680
+	  If you are compiling a kernel which will never run on a
681
+	  machine with more than 128 MB total physical RAM, answer
682
+	  N here.
683
+
684
+	  If unsure, say Y.
685
+
686
+config FORCE_MAX_ZONEORDER
687
+	int "Maximum zone order"
688
+	default "11"
689
+	help
690
+	  The kernel memory allocator divides physically contiguous memory
691
+	  blocks into "zones", where each zone is a power of two number of
692
+	  pages.  This option selects the largest power of two that the kernel
693
+	  keeps in the memory allocator.  If you need to allocate very large
694
+	  blocks of physically contiguous memory, then you may need to
695
+	  increase this value.
696
+
697
+	  This config option is actually maximum order plus one. For example,
698
+	  a value of 11 means that the largest free memory block is 2^10 pages.
699
+
580700 endmenu
581701 
582702 menu "Power management options"