1 # For a description of the syntax of this configuration file,
2 # see Documentation/kbuild/kconfig-language.txt.
7 select HAVE_DMA_API_DEBUG
8 select HAVE_KVM if !TILEGX
9 select GENERIC_FIND_FIRST_BIT
10 select USE_GENERIC_SMP_HELPERS
11 select CC_OPTIMIZE_FOR_SIZE
12 select HAVE_GENERIC_HARDIRQS
13 select GENERIC_IRQ_PROBE
14 select GENERIC_PENDING_IRQ if SMP
15 select GENERIC_IRQ_SHOW
16 select HAVE_SYSCALL_WRAPPERS if TILEGX
18 select ARCH_HAVE_NMI_SAFE_CMPXCHG
19 select GENERIC_CLOCKEVENTS
21 # FIXME: investigate whether we need/want these options.
22 # select HAVE_IOREMAP_PROT
23 # select HAVE_OPTPROBES
24 # select HAVE_REGS_AND_STACK_ACCESS_API
25 # select HAVE_HW_BREAKPOINT
27 # select HAVE_USER_RETURN_NOTIFIER
29 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
30 # config HUGETLB_PAGE_SIZE_VARIABLE
38 config SEMAPHORE_SLEEPERS
41 config HAVE_ARCH_ALLOC_REMAP
44 config HAVE_SETUP_PER_CPU_AREA
47 config NEED_PER_CPU_PAGE_FIRST_CHUNK
50 config SYS_SUPPORTS_HUGETLBFS
53 # Support for additional huge page sizes besides HPAGE_SIZE.
54 # The software support is currently only present in the TILE-Gx
55 # hypervisor. TILEPro in any case does not support page sizes
56 # larger than the default HPAGE_SIZE.
57 config HUGETLB_SUPER_PAGES
58 depends on HUGETLB_PAGE && TILEGX
61 # FIXME: tilegx can implement a more efficient rwsem.
62 config RWSEM_GENERIC_SPINLOCK
65 # We have a very flat architecture from a migration point of view,
66 # so save boot time by presetting this (particularly useful on tile-sim).
67 config DEFAULT_MIGRATION_COST
71 # We only support gcc 4.4 and above, so this should work.
72 config ARCH_SUPPORTS_OPTIMIZED_INLINING
75 config ARCH_PHYS_ADDR_T_64BIT
78 config ARCH_DMA_ADDR_T_64BIT
81 config NEED_DMA_MAP_STATE
84 config ARCH_HAS_DMA_SET_COHERENT_MASK
87 config LOCKDEP_SUPPORT
90 config STACKTRACE_SUPPORT
94 # We use discontigmem for now; at some point we may want to switch
95 # to sparsemem (Tilera bug 7996).
96 config ARCH_DISCONTIGMEM_ENABLE
99 config ARCH_DISCONTIGMEM_DEFAULT
102 config TRACE_IRQFLAGS_SUPPORT
108 # SMP is required for Tilera Linux.
112 # Allow checking for compile-time determined overflow errors in
113 # copy_from_user(). There are still unprovable places in the
114 # generic code as of 2.6.34, so this option is not really compatible
115 # with -Werror, which is more useful in general.
116 config DEBUG_COPY_FROM_USER
124 bool "Building with TILE-Gx (64-bit) compiler and toolchain"
132 config ARCH_DEFCONFIG
134 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
135 default "arch/tile/configs/tilegx_defconfig" if TILEGX
137 source "init/Kconfig"
139 menu "Tilera-specific configuration"
142 int "Maximum number of tiles (2-255)"
147 Building with 64 is the recommended value, but a slightly
148 smaller kernel memory footprint results from using a smaller
149 value on chips with fewer tiles.
154 prompt "Kernel page size"
155 default PAGE_SIZE_64KB
157 This lets you select the page size of the kernel. For best
158 performance on memory-intensive applications, a page size of 64KB
159 is recommended. For workloads involving many small files, many
160 connections, etc., it may be better to select 16KB, which uses
161 memory more efficiently at some cost in TLB performance.
163 Note that this option is TILE-Gx specific; currently
164 TILEPro page size is set by rebuilding the hypervisor.
166 config PAGE_SIZE_16KB
169 config PAGE_SIZE_64KB
176 source "kernel/Kconfig.hz"
179 bool "kexec system call"
181 kexec is a system call that implements the ability to shutdown your
182 current kernel, and to start another kernel. It is like a reboot
183 but it is independent of the system firmware. It is used
184 to implement the "mboot" Tilera booter.
186 The name comes from the similarity to the exec system call.
189 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
191 select COMPAT_BINFMT_ELF
194 If enabled, the kernel will support running TILE-Gx binaries
195 that were built with the -m32 option.
197 config SYSVIPC_COMPAT
199 depends on COMPAT && SYSVIPC
201 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
203 bool # "Support for more than 512 MB of RAM"
206 Linux can use the full amount of RAM in the system by
207 default. However, the address space of TILE processors is
208 only 4 Gigabytes large. That means that, if you have a large
209 amount of physical memory, not all of it can be "permanently
210 mapped" by the kernel. The physical memory that's not
211 permanently mapped is called "high memory".
213 If you are compiling a kernel which will never run on a
214 machine with more than 512 MB total physical RAM, answer
215 "false" here. This will result in the kernel mapping all of
216 physical memory into the top 1 GB of virtual memory space.
218 If unsure, say "true".
226 config NEED_SG_DMA_LENGTH
233 select NEED_SG_DMA_LENGTH
234 select ARCH_HAS_DMA_SET_COHERENT_MASK
236 # We do not currently support disabling NUMA.
238 bool # "NUMA Memory Allocation and Scheduler Support"
239 depends on SMP && DISCONTIGMEM
242 NUMA memory allocation is required for TILE processors
243 unless booting with memory striping enabled in the
244 hypervisor, or with only a single memory controller.
245 It is recommended that this option always be enabled.
248 int "Log base 2 of the max number of memory controllers"
250 depends on NEED_MULTIPLE_NODES
252 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
253 In a system with more controllers, this value should be raised.
257 prompt "Memory split" if EXPERT
260 Select the desired split between kernel and user memory.
262 If the address range available to the kernel is less than the
263 physical memory installed, the remaining memory will be available
264 as "high memory". Accessing high memory is a little more costly
265 than low memory, as it needs to be mapped into the kernel first.
266 Note that increasing the kernel address space limits the range
267 available to user programs, making the address space there
268 tighter. Selecting anything other than the default 3G/1G split
269 will also likely make your kernel incompatible with binary-only
272 If you are not absolutely sure what you are doing, leave this
276 bool "3.75G/0.25G user/kernel split (no kernel networking)"
278 bool "3.5G/0.5G user/kernel split"
280 bool "3G/1G user/kernel split"
282 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
284 bool "2.5G/1.5G user/kernel split"
286 bool "2.25G/1.75G user/kernel split"
288 bool "2G/2G user/kernel split"
290 bool "1G/3G user/kernel split"
296 default 0xF0000000 if VMSPLIT_3_75G
297 default 0xE0000000 if VMSPLIT_3_5G
298 default 0xB0000000 if VMSPLIT_2_75G
299 default 0xA0000000 if VMSPLIT_2_5G
300 default 0x90000000 if VMSPLIT_2_25G
301 default 0x80000000 if VMSPLIT_2G
302 default 0x40000000 if VMSPLIT_1G
308 bool "Built-in kernel command line"
311 Allow for specifying boot arguments to the kernel at
312 build time. On some systems (e.g. embedded ones), it is
313 necessary or convenient to provide some or all of the
314 kernel boot arguments with the kernel itself (that is,
315 to not rely on the boot loader to provide them.)
317 To compile command line arguments into the kernel,
318 set this option to 'Y', then fill in the
319 the boot arguments in CONFIG_CMDLINE.
321 Systems with fully functional boot loaders (e.g. mboot, or
322 if booting over PCI) should leave this option set to 'N'.
325 string "Built-in kernel command string"
326 depends on CMDLINE_BOOL
329 Enter arguments here that should be compiled into the kernel
330 image and used at boot time. If the boot loader provides a
331 command line at boot time, it is appended to this string to
332 form the full kernel command line, when the system boots.
334 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
335 change this behavior.
337 In most cases, the command line (whether built-in or provided
338 by the boot loader) should specify the device for the root
341 config CMDLINE_OVERRIDE
342 bool "Built-in command line overrides boot loader arguments"
344 depends on CMDLINE_BOOL
346 Set this option to 'Y' to have the kernel ignore the boot loader
347 command line, and use ONLY the built-in command line.
349 This is used to work around broken boot loaders. This should
350 be set to 'N' under normal conditions.
352 config VMALLOC_RESERVE
357 bool "Hardwall support to allow access to user dynamic network"
361 int "Processor protection level for kernel"
365 This setting determines the processor protection level the
366 kernel will be built to run at. Generally you should use
367 the default value here.
369 source "arch/tile/gxio/Kconfig"
371 endmenu # Tilera-specific configuration
379 select GENERIC_PCI_IOMAP
380 select TILE_GXIO_TRIO if TILEGX
381 select ARCH_SUPPORTS_MSI if TILEGX
382 select PCI_MSI if TILEGX
384 Enable PCI root complex support, so PCIe endpoint devices can
385 be attached to the Tile chip. Many, but not all, PCI devices
386 are supported under Tilera's root complex driver.
397 source "drivers/pci/Kconfig"
400 tristate "Tilera USB host adapter support"
404 select TILE_GXIO_USB_HOST
406 Provides USB host adapter support for the built-in EHCI and OHCI
407 interfaces on TILE-Gx chips.
409 # USB OHCI needs the bounce pool since tilegx will often have more
410 # than 4GB of memory, but we don't currently use the IOTLB to present
411 # a 32-bit address to OHCI. So we need to use a bounce pool instead.
412 config NEED_BOUNCE_POOL
413 def_bool USB_OHCI_HCD
416 bool "Support for hot-pluggable devices"
418 Say Y here if you want to plug devices into your computer while
419 the system is running, and be able to use them quickly. In many
420 cases, the devices can likewise be unplugged at any time too.
421 One well-known example of this is USB.
423 source "drivers/pci/hotplug/Kconfig"
427 menu "Executable file formats"
434 source "fs/Kconfig.binfmt"
440 source "drivers/Kconfig"
444 source "arch/tile/Kconfig.debug"
446 source "security/Kconfig"
448 source "crypto/Kconfig"
452 source "arch/tile/kvm/Kconfig"