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 SYSCTL_EXCEPTION_TRACE
11 select USE_GENERIC_SMP_HELPERS
12 select CC_OPTIMIZE_FOR_SIZE
13 select HAVE_DEBUG_KMEMLEAK
14 select HAVE_GENERIC_HARDIRQS
15 select GENERIC_IRQ_PROBE
16 select GENERIC_PENDING_IRQ if SMP
17 select GENERIC_IRQ_SHOW
18 select HAVE_DEBUG_BUGVERBOSE
19 select HAVE_SYSCALL_WRAPPERS if TILEGX
21 select ARCH_HAVE_NMI_SAFE_CMPXCHG
22 select GENERIC_CLOCKEVENTS
23 select MODULES_USE_ELF_RELA
25 # FIXME: investigate whether we need/want these options.
26 # select HAVE_IOREMAP_PROT
27 # select HAVE_OPTPROBES
28 # select HAVE_REGS_AND_STACK_ACCESS_API
29 # select HAVE_HW_BREAKPOINT
31 # select HAVE_USER_RETURN_NOTIFIER
33 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
34 # config HUGETLB_PAGE_SIZE_VARIABLE
42 config SEMAPHORE_SLEEPERS
45 config HAVE_ARCH_ALLOC_REMAP
48 config HAVE_SETUP_PER_CPU_AREA
51 config NEED_PER_CPU_PAGE_FIRST_CHUNK
54 config SYS_SUPPORTS_HUGETLBFS
57 # Support for additional huge page sizes besides HPAGE_SIZE.
58 # The software support is currently only present in the TILE-Gx
59 # hypervisor. TILEPro in any case does not support page sizes
60 # larger than the default HPAGE_SIZE.
61 config HUGETLB_SUPER_PAGES
62 depends on HUGETLB_PAGE && TILEGX
65 # FIXME: tilegx can implement a more efficient rwsem.
66 config RWSEM_GENERIC_SPINLOCK
69 # We have a very flat architecture from a migration point of view,
70 # so save boot time by presetting this (particularly useful on tile-sim).
71 config DEFAULT_MIGRATION_COST
75 # We only support gcc 4.4 and above, so this should work.
76 config ARCH_SUPPORTS_OPTIMIZED_INLINING
79 config ARCH_PHYS_ADDR_T_64BIT
82 config ARCH_DMA_ADDR_T_64BIT
85 config NEED_DMA_MAP_STATE
88 config ARCH_HAS_DMA_SET_COHERENT_MASK
91 config LOCKDEP_SUPPORT
94 config STACKTRACE_SUPPORT
98 # We use discontigmem for now; at some point we may want to switch
99 # to sparsemem (Tilera bug 7996).
100 config ARCH_DISCONTIGMEM_ENABLE
103 config ARCH_DISCONTIGMEM_DEFAULT
106 config TRACE_IRQFLAGS_SUPPORT
112 # SMP is required for Tilera Linux.
116 # Allow checking for compile-time determined overflow errors in
117 # copy_from_user(). There are still unprovable places in the
118 # generic code as of 2.6.34, so this option is not really compatible
119 # with -Werror, which is more useful in general.
120 config DEBUG_COPY_FROM_USER
128 bool "Building with TILE-Gx (64-bit) compiler and toolchain"
136 config ARCH_DEFCONFIG
138 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
139 default "arch/tile/configs/tilegx_defconfig" if TILEGX
141 source "init/Kconfig"
143 source "kernel/Kconfig.freezer"
145 menu "Tilera-specific configuration"
148 int "Maximum number of tiles (2-255)"
153 Building with 64 is the recommended value, but a slightly
154 smaller kernel memory footprint results from using a smaller
155 value on chips with fewer tiles.
160 prompt "Kernel page size"
161 default PAGE_SIZE_64KB
163 This lets you select the page size of the kernel. For best
164 performance on memory-intensive applications, a page size of 64KB
165 is recommended. For workloads involving many small files, many
166 connections, etc., it may be better to select 16KB, which uses
167 memory more efficiently at some cost in TLB performance.
169 Note that this option is TILE-Gx specific; currently
170 TILEPro page size is set by rebuilding the hypervisor.
172 config PAGE_SIZE_16KB
175 config PAGE_SIZE_64KB
182 source "kernel/Kconfig.hz"
185 bool "kexec system call"
187 kexec is a system call that implements the ability to shutdown your
188 current kernel, and to start another kernel. It is like a reboot
189 but it is independent of the system firmware. It is used
190 to implement the "mboot" Tilera booter.
192 The name comes from the similarity to the exec system call.
195 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
197 select COMPAT_BINFMT_ELF
200 If enabled, the kernel will support running TILE-Gx binaries
201 that were built with the -m32 option.
203 config SYSVIPC_COMPAT
205 depends on COMPAT && SYSVIPC
207 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
209 bool # "Support for more than 512 MB of RAM"
212 Linux can use the full amount of RAM in the system by
213 default. However, the address space of TILE processors is
214 only 4 Gigabytes large. That means that, if you have a large
215 amount of physical memory, not all of it can be "permanently
216 mapped" by the kernel. The physical memory that's not
217 permanently mapped is called "high memory".
219 If you are compiling a kernel which will never run on a
220 machine with more than 512 MB total physical RAM, answer
221 "false" here. This will result in the kernel mapping all of
222 physical memory into the top 1 GB of virtual memory space.
224 If unsure, say "true".
232 config NEED_SG_DMA_LENGTH
239 select NEED_SG_DMA_LENGTH
240 select ARCH_HAS_DMA_SET_COHERENT_MASK
242 # We do not currently support disabling NUMA.
244 bool # "NUMA Memory Allocation and Scheduler Support"
245 depends on SMP && DISCONTIGMEM
248 NUMA memory allocation is required for TILE processors
249 unless booting with memory striping enabled in the
250 hypervisor, or with only a single memory controller.
251 It is recommended that this option always be enabled.
254 int "Log base 2 of the max number of memory controllers"
256 depends on NEED_MULTIPLE_NODES
258 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
259 In a system with more controllers, this value should be raised.
263 prompt "Memory split" if EXPERT
266 Select the desired split between kernel and user memory.
268 If the address range available to the kernel is less than the
269 physical memory installed, the remaining memory will be available
270 as "high memory". Accessing high memory is a little more costly
271 than low memory, as it needs to be mapped into the kernel first.
272 Note that increasing the kernel address space limits the range
273 available to user programs, making the address space there
274 tighter. Selecting anything other than the default 3G/1G split
275 will also likely make your kernel incompatible with binary-only
278 If you are not absolutely sure what you are doing, leave this
282 bool "3.75G/0.25G user/kernel split (no kernel networking)"
284 bool "3.5G/0.5G user/kernel split"
286 bool "3G/1G user/kernel split"
288 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
290 bool "2.5G/1.5G user/kernel split"
292 bool "2.25G/1.75G user/kernel split"
294 bool "2G/2G user/kernel split"
296 bool "1G/3G user/kernel split"
302 default 0xF0000000 if VMSPLIT_3_75G
303 default 0xE0000000 if VMSPLIT_3_5G
304 default 0xB0000000 if VMSPLIT_2_75G
305 default 0xA0000000 if VMSPLIT_2_5G
306 default 0x90000000 if VMSPLIT_2_25G
307 default 0x80000000 if VMSPLIT_2G
308 default 0x40000000 if VMSPLIT_1G
314 bool "Built-in kernel command line"
317 Allow for specifying boot arguments to the kernel at
318 build time. On some systems (e.g. embedded ones), it is
319 necessary or convenient to provide some or all of the
320 kernel boot arguments with the kernel itself (that is,
321 to not rely on the boot loader to provide them.)
323 To compile command line arguments into the kernel,
324 set this option to 'Y', then fill in the
325 the boot arguments in CONFIG_CMDLINE.
327 Systems with fully functional boot loaders (e.g. mboot, or
328 if booting over PCI) should leave this option set to 'N'.
331 string "Built-in kernel command string"
332 depends on CMDLINE_BOOL
335 Enter arguments here that should be compiled into the kernel
336 image and used at boot time. If the boot loader provides a
337 command line at boot time, it is appended to this string to
338 form the full kernel command line, when the system boots.
340 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
341 change this behavior.
343 In most cases, the command line (whether built-in or provided
344 by the boot loader) should specify the device for the root
347 config CMDLINE_OVERRIDE
348 bool "Built-in command line overrides boot loader arguments"
350 depends on CMDLINE_BOOL
352 Set this option to 'Y' to have the kernel ignore the boot loader
353 command line, and use ONLY the built-in command line.
355 This is used to work around broken boot loaders. This should
356 be set to 'N' under normal conditions.
358 config VMALLOC_RESERVE
363 bool "Hardwall support to allow access to user dynamic network"
367 int "Processor protection level for kernel"
371 This setting determines the processor protection level the
372 kernel will be built to run at. Generally you should use
373 the default value here.
375 source "arch/tile/gxio/Kconfig"
377 endmenu # Tilera-specific configuration
385 select GENERIC_PCI_IOMAP
386 select TILE_GXIO_TRIO if TILEGX
387 select ARCH_SUPPORTS_MSI if TILEGX
388 select PCI_MSI if TILEGX
390 Enable PCI root complex support, so PCIe endpoint devices can
391 be attached to the Tile chip. Many, but not all, PCI devices
392 are supported under Tilera's root complex driver.
403 source "drivers/pci/Kconfig"
406 tristate "Tilera USB host adapter support"
410 select TILE_GXIO_USB_HOST
412 Provides USB host adapter support for the built-in EHCI and OHCI
413 interfaces on TILE-Gx chips.
415 # USB OHCI needs the bounce pool since tilegx will often have more
416 # than 4GB of memory, but we don't currently use the IOTLB to present
417 # a 32-bit address to OHCI. So we need to use a bounce pool instead.
418 config NEED_BOUNCE_POOL
419 def_bool USB_OHCI_HCD
421 source "drivers/pci/hotplug/Kconfig"
425 menu "Executable file formats"
432 source "fs/Kconfig.binfmt"
438 source "drivers/Kconfig"
442 source "arch/tile/Kconfig.debug"
444 source "security/Kconfig"
446 source "crypto/Kconfig"
450 source "arch/tile/kvm/Kconfig"