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
24 select GENERIC_SIGALTSTACK
25 select GENERIC_COMPAT_RT_SIGACTION
26 select GENERIC_COMPAT_RT_SIGQUEUEINFO
27 select GENERIC_COMPAT_RT_SIGPROCMASK
28 select GENERIC_COMPAT_RT_SIGPENDING
30 # FIXME: investigate whether we need/want these options.
31 # select HAVE_IOREMAP_PROT
32 # select HAVE_OPTPROBES
33 # select HAVE_REGS_AND_STACK_ACCESS_API
34 # select HAVE_HW_BREAKPOINT
36 # select HAVE_USER_RETURN_NOTIFIER
38 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
39 # config HUGETLB_PAGE_SIZE_VARIABLE
47 config SEMAPHORE_SLEEPERS
50 config HAVE_ARCH_ALLOC_REMAP
53 config HAVE_SETUP_PER_CPU_AREA
56 config NEED_PER_CPU_PAGE_FIRST_CHUNK
59 config SYS_SUPPORTS_HUGETLBFS
62 # Support for additional huge page sizes besides HPAGE_SIZE.
63 # The software support is currently only present in the TILE-Gx
64 # hypervisor. TILEPro in any case does not support page sizes
65 # larger than the default HPAGE_SIZE.
66 config HUGETLB_SUPER_PAGES
67 depends on HUGETLB_PAGE && TILEGX
70 # FIXME: tilegx can implement a more efficient rwsem.
71 config RWSEM_GENERIC_SPINLOCK
74 # We have a very flat architecture from a migration point of view,
75 # so save boot time by presetting this (particularly useful on tile-sim).
76 config DEFAULT_MIGRATION_COST
80 # We only support gcc 4.4 and above, so this should work.
81 config ARCH_SUPPORTS_OPTIMIZED_INLINING
84 config ARCH_PHYS_ADDR_T_64BIT
87 config ARCH_DMA_ADDR_T_64BIT
90 config NEED_DMA_MAP_STATE
93 config ARCH_HAS_DMA_SET_COHERENT_MASK
96 config LOCKDEP_SUPPORT
99 config STACKTRACE_SUPPORT
103 # We use discontigmem for now; at some point we may want to switch
104 # to sparsemem (Tilera bug 7996).
105 config ARCH_DISCONTIGMEM_ENABLE
108 config ARCH_DISCONTIGMEM_DEFAULT
111 config TRACE_IRQFLAGS_SUPPORT
117 # SMP is required for Tilera Linux.
121 # Allow checking for compile-time determined overflow errors in
122 # copy_from_user(). There are still unprovable places in the
123 # generic code as of 2.6.34, so this option is not really compatible
124 # with -Werror, which is more useful in general.
125 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 menu "Tilera-specific configuration"
151 int "Maximum number of tiles (2-255)"
156 Building with 64 is the recommended value, but a slightly
157 smaller kernel memory footprint results from using a smaller
158 value on chips with fewer tiles.
163 prompt "Kernel page size"
164 default PAGE_SIZE_64KB
166 This lets you select the page size of the kernel. For best
167 performance on memory-intensive applications, a page size of 64KB
168 is recommended. For workloads involving many small files, many
169 connections, etc., it may be better to select 16KB, which uses
170 memory more efficiently at some cost in TLB performance.
172 Note that this option is TILE-Gx specific; currently
173 TILEPro page size is set by rebuilding the hypervisor.
175 config PAGE_SIZE_16KB
178 config PAGE_SIZE_64KB
185 source "kernel/Kconfig.hz"
188 bool "kexec system call"
190 kexec is a system call that implements the ability to shutdown your
191 current kernel, and to start another kernel. It is like a reboot
192 but it is independent of the system firmware. It is used
193 to implement the "mboot" Tilera booter.
195 The name comes from the similarity to the exec system call.
198 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
200 select COMPAT_BINFMT_ELF
203 If enabled, the kernel will support running TILE-Gx binaries
204 that were built with the -m32 option.
206 config SYSVIPC_COMPAT
208 depends on COMPAT && SYSVIPC
210 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
212 bool # "Support for more than 512 MB of RAM"
215 Linux can use the full amount of RAM in the system by
216 default. However, the address space of TILE processors is
217 only 4 Gigabytes large. That means that, if you have a large
218 amount of physical memory, not all of it can be "permanently
219 mapped" by the kernel. The physical memory that's not
220 permanently mapped is called "high memory".
222 If you are compiling a kernel which will never run on a
223 machine with more than 512 MB total physical RAM, answer
224 "false" here. This will result in the kernel mapping all of
225 physical memory into the top 1 GB of virtual memory space.
227 If unsure, say "true".
235 config NEED_SG_DMA_LENGTH
242 select NEED_SG_DMA_LENGTH
243 select ARCH_HAS_DMA_SET_COHERENT_MASK
245 # We do not currently support disabling NUMA.
247 bool # "NUMA Memory Allocation and Scheduler Support"
248 depends on SMP && DISCONTIGMEM
251 NUMA memory allocation is required for TILE processors
252 unless booting with memory striping enabled in the
253 hypervisor, or with only a single memory controller.
254 It is recommended that this option always be enabled.
257 int "Log base 2 of the max number of memory controllers"
259 depends on NEED_MULTIPLE_NODES
261 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
262 In a system with more controllers, this value should be raised.
266 prompt "Memory split" if EXPERT
269 Select the desired split between kernel and user memory.
271 If the address range available to the kernel is less than the
272 physical memory installed, the remaining memory will be available
273 as "high memory". Accessing high memory is a little more costly
274 than low memory, as it needs to be mapped into the kernel first.
275 Note that increasing the kernel address space limits the range
276 available to user programs, making the address space there
277 tighter. Selecting anything other than the default 3G/1G split
278 will also likely make your kernel incompatible with binary-only
281 If you are not absolutely sure what you are doing, leave this
285 bool "3.75G/0.25G user/kernel split (no kernel networking)"
287 bool "3.5G/0.5G user/kernel split"
289 bool "3G/1G user/kernel split"
291 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
293 bool "2.5G/1.5G user/kernel split"
295 bool "2.25G/1.75G user/kernel split"
297 bool "2G/2G user/kernel split"
299 bool "1G/3G user/kernel split"
305 default 0xF0000000 if VMSPLIT_3_75G
306 default 0xE0000000 if VMSPLIT_3_5G
307 default 0xB0000000 if VMSPLIT_2_75G
308 default 0xA0000000 if VMSPLIT_2_5G
309 default 0x90000000 if VMSPLIT_2_25G
310 default 0x80000000 if VMSPLIT_2G
311 default 0x40000000 if VMSPLIT_1G
317 bool "Built-in kernel command line"
320 Allow for specifying boot arguments to the kernel at
321 build time. On some systems (e.g. embedded ones), it is
322 necessary or convenient to provide some or all of the
323 kernel boot arguments with the kernel itself (that is,
324 to not rely on the boot loader to provide them.)
326 To compile command line arguments into the kernel,
327 set this option to 'Y', then fill in the
328 the boot arguments in CONFIG_CMDLINE.
330 Systems with fully functional boot loaders (e.g. mboot, or
331 if booting over PCI) should leave this option set to 'N'.
334 string "Built-in kernel command string"
335 depends on CMDLINE_BOOL
338 Enter arguments here that should be compiled into the kernel
339 image and used at boot time. If the boot loader provides a
340 command line at boot time, it is appended to this string to
341 form the full kernel command line, when the system boots.
343 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
344 change this behavior.
346 In most cases, the command line (whether built-in or provided
347 by the boot loader) should specify the device for the root
350 config CMDLINE_OVERRIDE
351 bool "Built-in command line overrides boot loader arguments"
353 depends on CMDLINE_BOOL
355 Set this option to 'Y' to have the kernel ignore the boot loader
356 command line, and use ONLY the built-in command line.
358 This is used to work around broken boot loaders. This should
359 be set to 'N' under normal conditions.
361 config VMALLOC_RESERVE
366 bool "Hardwall support to allow access to user dynamic network"
370 int "Processor protection level for kernel"
374 This setting determines the processor protection level the
375 kernel will be built to run at. Generally you should use
376 the default value here.
378 source "arch/tile/gxio/Kconfig"
380 endmenu # Tilera-specific configuration
388 select GENERIC_PCI_IOMAP
389 select TILE_GXIO_TRIO if TILEGX
390 select ARCH_SUPPORTS_MSI if TILEGX
391 select PCI_MSI if TILEGX
393 Enable PCI root complex support, so PCIe endpoint devices can
394 be attached to the Tile chip. Many, but not all, PCI devices
395 are supported under Tilera's root complex driver.
406 source "drivers/pci/Kconfig"
409 tristate "Tilera USB host adapter support"
413 select TILE_GXIO_USB_HOST
415 Provides USB host adapter support for the built-in EHCI and OHCI
416 interfaces on TILE-Gx chips.
418 # USB OHCI needs the bounce pool since tilegx will often have more
419 # than 4GB of memory, but we don't currently use the IOTLB to present
420 # a 32-bit address to OHCI. So we need to use a bounce pool instead.
421 config NEED_BOUNCE_POOL
422 def_bool USB_OHCI_HCD
424 source "drivers/pci/hotplug/Kconfig"
428 menu "Executable file formats"
435 source "fs/Kconfig.binfmt"
441 source "drivers/Kconfig"
445 source "arch/tile/Kconfig.debug"
447 source "security/Kconfig"
449 source "crypto/Kconfig"
453 source "arch/tile/kvm/Kconfig"