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
24 # FIXME: investigate whether we need/want these options.
25 # select HAVE_IOREMAP_PROT
26 # select HAVE_OPTPROBES
27 # select HAVE_REGS_AND_STACK_ACCESS_API
28 # select HAVE_HW_BREAKPOINT
30 # select HAVE_USER_RETURN_NOTIFIER
32 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
33 # config HUGETLB_PAGE_SIZE_VARIABLE
41 config SEMAPHORE_SLEEPERS
44 config HAVE_ARCH_ALLOC_REMAP
47 config HAVE_SETUP_PER_CPU_AREA
50 config NEED_PER_CPU_PAGE_FIRST_CHUNK
53 config SYS_SUPPORTS_HUGETLBFS
56 # Support for additional huge page sizes besides HPAGE_SIZE.
57 # The software support is currently only present in the TILE-Gx
58 # hypervisor. TILEPro in any case does not support page sizes
59 # larger than the default HPAGE_SIZE.
60 config HUGETLB_SUPER_PAGES
61 depends on HUGETLB_PAGE && TILEGX
64 # FIXME: tilegx can implement a more efficient rwsem.
65 config RWSEM_GENERIC_SPINLOCK
68 # We have a very flat architecture from a migration point of view,
69 # so save boot time by presetting this (particularly useful on tile-sim).
70 config DEFAULT_MIGRATION_COST
74 # We only support gcc 4.4 and above, so this should work.
75 config ARCH_SUPPORTS_OPTIMIZED_INLINING
78 config ARCH_PHYS_ADDR_T_64BIT
81 config ARCH_DMA_ADDR_T_64BIT
84 config NEED_DMA_MAP_STATE
87 config ARCH_HAS_DMA_SET_COHERENT_MASK
90 config LOCKDEP_SUPPORT
93 config STACKTRACE_SUPPORT
97 # We use discontigmem for now; at some point we may want to switch
98 # to sparsemem (Tilera bug 7996).
99 config ARCH_DISCONTIGMEM_ENABLE
102 config ARCH_DISCONTIGMEM_DEFAULT
105 config TRACE_IRQFLAGS_SUPPORT
111 # SMP is required for Tilera Linux.
115 # Allow checking for compile-time determined overflow errors in
116 # copy_from_user(). There are still unprovable places in the
117 # generic code as of 2.6.34, so this option is not really compatible
118 # with -Werror, which is more useful in general.
119 config DEBUG_COPY_FROM_USER
127 bool "Building with TILE-Gx (64-bit) compiler and toolchain"
135 config ARCH_DEFCONFIG
137 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
138 default "arch/tile/configs/tilegx_defconfig" if TILEGX
140 source "init/Kconfig"
142 menu "Tilera-specific configuration"
145 int "Maximum number of tiles (2-255)"
150 Building with 64 is the recommended value, but a slightly
151 smaller kernel memory footprint results from using a smaller
152 value on chips with fewer tiles.
157 prompt "Kernel page size"
158 default PAGE_SIZE_64KB
160 This lets you select the page size of the kernel. For best
161 performance on memory-intensive applications, a page size of 64KB
162 is recommended. For workloads involving many small files, many
163 connections, etc., it may be better to select 16KB, which uses
164 memory more efficiently at some cost in TLB performance.
166 Note that this option is TILE-Gx specific; currently
167 TILEPro page size is set by rebuilding the hypervisor.
169 config PAGE_SIZE_16KB
172 config PAGE_SIZE_64KB
179 source "kernel/Kconfig.hz"
182 bool "kexec system call"
184 kexec is a system call that implements the ability to shutdown your
185 current kernel, and to start another kernel. It is like a reboot
186 but it is independent of the system firmware. It is used
187 to implement the "mboot" Tilera booter.
189 The name comes from the similarity to the exec system call.
192 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
194 select COMPAT_BINFMT_ELF
197 If enabled, the kernel will support running TILE-Gx binaries
198 that were built with the -m32 option.
200 config SYSVIPC_COMPAT
202 depends on COMPAT && SYSVIPC
204 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
206 bool # "Support for more than 512 MB of RAM"
209 Linux can use the full amount of RAM in the system by
210 default. However, the address space of TILE processors is
211 only 4 Gigabytes large. That means that, if you have a large
212 amount of physical memory, not all of it can be "permanently
213 mapped" by the kernel. The physical memory that's not
214 permanently mapped is called "high memory".
216 If you are compiling a kernel which will never run on a
217 machine with more than 512 MB total physical RAM, answer
218 "false" here. This will result in the kernel mapping all of
219 physical memory into the top 1 GB of virtual memory space.
221 If unsure, say "true".
229 config NEED_SG_DMA_LENGTH
236 select NEED_SG_DMA_LENGTH
237 select ARCH_HAS_DMA_SET_COHERENT_MASK
239 # We do not currently support disabling NUMA.
241 bool # "NUMA Memory Allocation and Scheduler Support"
242 depends on SMP && DISCONTIGMEM
245 NUMA memory allocation is required for TILE processors
246 unless booting with memory striping enabled in the
247 hypervisor, or with only a single memory controller.
248 It is recommended that this option always be enabled.
251 int "Log base 2 of the max number of memory controllers"
253 depends on NEED_MULTIPLE_NODES
255 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
256 In a system with more controllers, this value should be raised.
260 prompt "Memory split" if EXPERT
263 Select the desired split between kernel and user memory.
265 If the address range available to the kernel is less than the
266 physical memory installed, the remaining memory will be available
267 as "high memory". Accessing high memory is a little more costly
268 than low memory, as it needs to be mapped into the kernel first.
269 Note that increasing the kernel address space limits the range
270 available to user programs, making the address space there
271 tighter. Selecting anything other than the default 3G/1G split
272 will also likely make your kernel incompatible with binary-only
275 If you are not absolutely sure what you are doing, leave this
279 bool "3.75G/0.25G user/kernel split (no kernel networking)"
281 bool "3.5G/0.5G user/kernel split"
283 bool "3G/1G user/kernel split"
285 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
287 bool "2.5G/1.5G user/kernel split"
289 bool "2.25G/1.75G user/kernel split"
291 bool "2G/2G user/kernel split"
293 bool "1G/3G user/kernel split"
299 default 0xF0000000 if VMSPLIT_3_75G
300 default 0xE0000000 if VMSPLIT_3_5G
301 default 0xB0000000 if VMSPLIT_2_75G
302 default 0xA0000000 if VMSPLIT_2_5G
303 default 0x90000000 if VMSPLIT_2_25G
304 default 0x80000000 if VMSPLIT_2G
305 default 0x40000000 if VMSPLIT_1G
311 bool "Built-in kernel command line"
314 Allow for specifying boot arguments to the kernel at
315 build time. On some systems (e.g. embedded ones), it is
316 necessary or convenient to provide some or all of the
317 kernel boot arguments with the kernel itself (that is,
318 to not rely on the boot loader to provide them.)
320 To compile command line arguments into the kernel,
321 set this option to 'Y', then fill in the
322 the boot arguments in CONFIG_CMDLINE.
324 Systems with fully functional boot loaders (e.g. mboot, or
325 if booting over PCI) should leave this option set to 'N'.
328 string "Built-in kernel command string"
329 depends on CMDLINE_BOOL
332 Enter arguments here that should be compiled into the kernel
333 image and used at boot time. If the boot loader provides a
334 command line at boot time, it is appended to this string to
335 form the full kernel command line, when the system boots.
337 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
338 change this behavior.
340 In most cases, the command line (whether built-in or provided
341 by the boot loader) should specify the device for the root
344 config CMDLINE_OVERRIDE
345 bool "Built-in command line overrides boot loader arguments"
347 depends on CMDLINE_BOOL
349 Set this option to 'Y' to have the kernel ignore the boot loader
350 command line, and use ONLY the built-in command line.
352 This is used to work around broken boot loaders. This should
353 be set to 'N' under normal conditions.
355 config VMALLOC_RESERVE
360 bool "Hardwall support to allow access to user dynamic network"
364 int "Processor protection level for kernel"
368 This setting determines the processor protection level the
369 kernel will be built to run at. Generally you should use
370 the default value here.
372 source "arch/tile/gxio/Kconfig"
374 endmenu # Tilera-specific configuration
382 select GENERIC_PCI_IOMAP
383 select TILE_GXIO_TRIO if TILEGX
384 select ARCH_SUPPORTS_MSI if TILEGX
385 select PCI_MSI if TILEGX
387 Enable PCI root complex support, so PCIe endpoint devices can
388 be attached to the Tile chip. Many, but not all, PCI devices
389 are supported under Tilera's root complex driver.
400 source "drivers/pci/Kconfig"
403 tristate "Tilera USB host adapter support"
407 select TILE_GXIO_USB_HOST
409 Provides USB host adapter support for the built-in EHCI and OHCI
410 interfaces on TILE-Gx chips.
412 # USB OHCI needs the bounce pool since tilegx will often have more
413 # than 4GB of memory, but we don't currently use the IOTLB to present
414 # a 32-bit address to OHCI. So we need to use a bounce pool instead.
415 config NEED_BOUNCE_POOL
416 def_bool USB_OHCI_HCD
418 source "drivers/pci/hotplug/Kconfig"
422 menu "Executable file formats"
429 source "fs/Kconfig.binfmt"
435 source "drivers/Kconfig"
439 source "arch/tile/Kconfig.debug"
441 source "security/Kconfig"
443 source "crypto/Kconfig"
447 source "arch/tile/kvm/Kconfig"