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
22 select ARCH_HAVE_NMI_SAFE_CMPXCHG
23 select GENERIC_CLOCKEVENTS
24 select MODULES_USE_ELF_RELA
25 select HAVE_ARCH_TRACEHOOK
26 select HAVE_SYSCALL_TRACEPOINTS
27 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
29 # FIXME: investigate whether we need/want these options.
30 # select HAVE_IOREMAP_PROT
31 # select HAVE_OPTPROBES
32 # select HAVE_REGS_AND_STACK_ACCESS_API
33 # select HAVE_HW_BREAKPOINT
35 # select HAVE_USER_RETURN_NOTIFIER
37 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
38 # config HUGETLB_PAGE_SIZE_VARIABLE
46 config SEMAPHORE_SLEEPERS
49 config HAVE_ARCH_ALLOC_REMAP
52 config HAVE_SETUP_PER_CPU_AREA
55 config NEED_PER_CPU_PAGE_FIRST_CHUNK
58 config SYS_SUPPORTS_HUGETLBFS
61 # Support for additional huge page sizes besides HPAGE_SIZE.
62 # The software support is currently only present in the TILE-Gx
63 # hypervisor. TILEPro in any case does not support page sizes
64 # larger than the default HPAGE_SIZE.
65 config HUGETLB_SUPER_PAGES
66 depends on HUGETLB_PAGE && TILEGX
69 # FIXME: tilegx can implement a more efficient rwsem.
70 config RWSEM_GENERIC_SPINLOCK
73 # We have a very flat architecture from a migration point of view,
74 # so save boot time by presetting this (particularly useful on tile-sim).
75 config DEFAULT_MIGRATION_COST
79 # We only support gcc 4.4 and above, so this should work.
80 config ARCH_SUPPORTS_OPTIMIZED_INLINING
83 config ARCH_PHYS_ADDR_T_64BIT
86 config ARCH_DMA_ADDR_T_64BIT
89 config NEED_DMA_MAP_STATE
92 config ARCH_HAS_DMA_SET_COHERENT_MASK
95 config LOCKDEP_SUPPORT
98 config STACKTRACE_SUPPORT
102 # We use discontigmem for now; at some point we may want to switch
103 # to sparsemem (Tilera bug 7996).
104 config ARCH_DISCONTIGMEM_ENABLE
107 config ARCH_DISCONTIGMEM_DEFAULT
110 config TRACE_IRQFLAGS_SUPPORT
116 # SMP is required for Tilera Linux.
120 # Allow checking for compile-time determined overflow errors in
121 # copy_from_user(). There are still unprovable places in the
122 # generic code as of 2.6.34, so this option is not really compatible
123 # with -Werror, which is more useful in general.
124 config DEBUG_COPY_FROM_USER
133 bool "Building with TILE-Gx (64-bit) compiler and toolchain"
141 config ARCH_DEFCONFIG
143 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
144 default "arch/tile/configs/tilegx_defconfig" if TILEGX
146 source "init/Kconfig"
148 source "kernel/Kconfig.freezer"
150 menu "Tilera-specific configuration"
153 int "Maximum number of tiles (2-255)"
158 Building with 64 is the recommended value, but a slightly
159 smaller kernel memory footprint results from using a smaller
160 value on chips with fewer tiles.
165 prompt "Kernel page size"
166 default PAGE_SIZE_64KB
168 This lets you select the page size of the kernel. For best
169 performance on memory-intensive applications, a page size of 64KB
170 is recommended. For workloads involving many small files, many
171 connections, etc., it may be better to select 16KB, which uses
172 memory more efficiently at some cost in TLB performance.
174 Note that this option is TILE-Gx specific; currently
175 TILEPro page size is set by rebuilding the hypervisor.
177 config PAGE_SIZE_16KB
180 config PAGE_SIZE_64KB
187 source "kernel/Kconfig.hz"
190 bool "kexec system call"
192 kexec is a system call that implements the ability to shutdown your
193 current kernel, and to start another kernel. It is like a reboot
194 but it is independent of the system firmware. It is used
195 to implement the "mboot" Tilera booter.
197 The name comes from the similarity to the exec system call.
200 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
202 select COMPAT_BINFMT_ELF
205 If enabled, the kernel will support running TILE-Gx binaries
206 that were built with the -m32 option.
208 config SYSVIPC_COMPAT
210 depends on COMPAT && SYSVIPC
212 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
214 bool # "Support for more than 512 MB of RAM"
217 Linux can use the full amount of RAM in the system by
218 default. However, the address space of TILE processors is
219 only 4 Gigabytes large. That means that, if you have a large
220 amount of physical memory, not all of it can be "permanently
221 mapped" by the kernel. The physical memory that's not
222 permanently mapped is called "high memory".
224 If you are compiling a kernel which will never run on a
225 machine with more than 512 MB total physical RAM, answer
226 "false" here. This will result in the kernel mapping all of
227 physical memory into the top 1 GB of virtual memory space.
229 If unsure, say "true".
237 config NEED_SG_DMA_LENGTH
244 select NEED_SG_DMA_LENGTH
245 select ARCH_HAS_DMA_SET_COHERENT_MASK
247 # We do not currently support disabling NUMA.
249 bool # "NUMA Memory Allocation and Scheduler Support"
250 depends on SMP && DISCONTIGMEM
253 NUMA memory allocation is required for TILE processors
254 unless booting with memory striping enabled in the
255 hypervisor, or with only a single memory controller.
256 It is recommended that this option always be enabled.
259 int "Log base 2 of the max number of memory controllers"
261 depends on NEED_MULTIPLE_NODES
263 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
264 In a system with more controllers, this value should be raised.
268 prompt "Memory split" if EXPERT
271 Select the desired split between kernel and user memory.
273 If the address range available to the kernel is less than the
274 physical memory installed, the remaining memory will be available
275 as "high memory". Accessing high memory is a little more costly
276 than low memory, as it needs to be mapped into the kernel first.
277 Note that increasing the kernel address space limits the range
278 available to user programs, making the address space there
279 tighter. Selecting anything other than the default 3G/1G split
280 will also likely make your kernel incompatible with binary-only
283 If you are not absolutely sure what you are doing, leave this
287 bool "3.75G/0.25G user/kernel split (no kernel networking)"
289 bool "3.5G/0.5G user/kernel split"
291 bool "3G/1G user/kernel split"
293 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
295 bool "2.5G/1.5G user/kernel split"
297 bool "2.25G/1.75G user/kernel split"
299 bool "2G/2G user/kernel split"
301 bool "1G/3G user/kernel split"
307 default 0xF0000000 if VMSPLIT_3_75G
308 default 0xE0000000 if VMSPLIT_3_5G
309 default 0xB0000000 if VMSPLIT_2_75G
310 default 0xA0000000 if VMSPLIT_2_5G
311 default 0x90000000 if VMSPLIT_2_25G
312 default 0x80000000 if VMSPLIT_2G
313 default 0x40000000 if VMSPLIT_1G
319 bool "Built-in kernel command line"
322 Allow for specifying boot arguments to the kernel at
323 build time. On some systems (e.g. embedded ones), it is
324 necessary or convenient to provide some or all of the
325 kernel boot arguments with the kernel itself (that is,
326 to not rely on the boot loader to provide them.)
328 To compile command line arguments into the kernel,
329 set this option to 'Y', then fill in the
330 the boot arguments in CONFIG_CMDLINE.
332 Systems with fully functional boot loaders (e.g. mboot, or
333 if booting over PCI) should leave this option set to 'N'.
336 string "Built-in kernel command string"
337 depends on CMDLINE_BOOL
340 Enter arguments here that should be compiled into the kernel
341 image and used at boot time. If the boot loader provides a
342 command line at boot time, it is appended to this string to
343 form the full kernel command line, when the system boots.
345 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
346 change this behavior.
348 In most cases, the command line (whether built-in or provided
349 by the boot loader) should specify the device for the root
352 config CMDLINE_OVERRIDE
353 bool "Built-in command line overrides boot loader arguments"
355 depends on CMDLINE_BOOL
357 Set this option to 'Y' to have the kernel ignore the boot loader
358 command line, and use ONLY the built-in command line.
360 This is used to work around broken boot loaders. This should
361 be set to 'N' under normal conditions.
363 config VMALLOC_RESERVE
368 bool "Hardwall support to allow access to user dynamic network"
372 int "Processor protection level for kernel"
376 This setting determines the processor protection level the
377 kernel will be built to run at. Generally you should use
378 the default value here.
380 source "arch/tile/gxio/Kconfig"
382 endmenu # Tilera-specific configuration
390 select GENERIC_PCI_IOMAP
391 select TILE_GXIO_TRIO if TILEGX
392 select ARCH_SUPPORTS_MSI if TILEGX
393 select PCI_MSI if TILEGX
395 Enable PCI root complex support, so PCIe endpoint devices can
396 be attached to the Tile chip. Many, but not all, PCI devices
397 are supported under Tilera's root complex driver.
408 source "drivers/pci/Kconfig"
411 tristate "Tilera USB host adapter support"
415 select TILE_GXIO_USB_HOST
417 Provides USB host adapter support for the built-in EHCI and OHCI
418 interfaces on TILE-Gx chips.
420 source "drivers/pci/hotplug/Kconfig"
424 menu "Executable file formats"
431 source "fs/Kconfig.binfmt"
437 source "drivers/Kconfig"
441 source "arch/tile/Kconfig.debug"
443 source "security/Kconfig"
445 source "crypto/Kconfig"
449 source "arch/tile/kvm/Kconfig"