1 # For a description of the syntax of this configuration file,
2 # see Documentation/kbuild/config-language.txt.
10 config GENERIC_HARDIRQS
13 config GENERIC_HARDIRQS_NO__DO_IRQ
16 config GENERIC_IRQ_PROBE
19 config GENERIC_PENDING_IRQ
21 depends on GENERIC_HARDIRQS && SMP
23 config SEMAPHORE_SLEEPERS
26 config HAVE_ARCH_ALLOC_REMAP
29 config HAVE_SETUP_PER_CPU_AREA
32 config NEED_PER_CPU_PAGE_FIRST_CHUNK
35 config SYS_SUPPORTS_HUGETLBFS
41 config GENERIC_CLOCKEVENTS
44 # FIXME: tilegx can implement a more efficent rwsem.
45 config RWSEM_GENERIC_SPINLOCK
48 # We have a very flat architecture from a migration point of view,
49 # so save boot time by presetting this (particularly useful on tile-sim).
50 config DEFAULT_MIGRATION_COST
54 # We only support gcc 4.4 and above, so this should work.
55 config ARCH_SUPPORTS_OPTIMIZED_INLINING
58 config ARCH_PHYS_ADDR_T_64BIT
61 config ARCH_DMA_ADDR_T_64BIT
64 config LOCKDEP_SUPPORT
67 config STACKTRACE_SUPPORT
71 # We use discontigmem for now; at some point we may want to switch
72 # to sparsemem (Tilera bug 7996).
73 config ARCH_DISCONTIGMEM_ENABLE
76 config ARCH_DISCONTIGMEM_DEFAULT
79 config TRACE_IRQFLAGS_SUPPORT
85 # SMP is required for Tilera Linux.
89 # Allow checking for compile-time determined overflow errors in
90 # copy_from_user(). There are still unprovable places in the
91 # generic code as of 2.6.34, so this option is not really compatible
92 # with -Werror, which is more useful in general.
93 config DEBUG_COPY_FROM_USER
102 select HAVE_KVM if !TILEGX
103 select GENERIC_FIND_FIRST_BIT
104 select GENERIC_FIND_NEXT_BIT
105 select USE_GENERIC_SMP_HELPERS
106 select CC_OPTIMIZE_FOR_SIZE
108 # FIXME: investigate whether we need/want these options.
109 # select HAVE_IOREMAP_PROT
110 # select HAVE_OPTPROBES
111 # select HAVE_REGS_AND_STACK_ACCESS_API
112 # select HAVE_HW_BREAKPOINT
114 # select HAVE_USER_RETURN_NOTIFIER
116 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
117 # config HUGETLB_PAGE_SIZE_VARIABLE
120 # Please note: TILE-Gx support is not yet finalized; this is
121 # the preliminary support. TILE-Gx drivers are only provided
122 # with the alpha or beta test versions for Tilera customers.
124 depends on EXPERIMENTAL
125 bool "Building with TILE-Gx (64-bit) compiler and toolchain"
131 config ARCH_DEFCONFIG
133 default "arch/tile/configs/tile_defconfig" if !TILEGX
134 default "arch/tile/configs/tilegx_defconfig" if TILEGX
136 source "init/Kconfig"
138 menu "Tilera-specific configuration"
141 int "Maximum number of tiles (2-255)"
146 Building with 64 is the recommended value, but a slightly
147 smaller kernel memory footprint results from using a smaller
148 value on chips with fewer tiles.
150 source "kernel/time/Kconfig"
152 source "kernel/Kconfig.hz"
155 bool "kexec system call"
157 kexec is a system call that implements the ability to shutdown your
158 current kernel, and to start another kernel. It is like a reboot
159 but it is independent of the system firmware. It is used
160 to implement the "mboot" Tilera booter.
162 The name comes from the similarity to the exec system call.
165 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
167 select COMPAT_BINFMT_ELF
170 If enabled, the kernel will support running TILE-Gx binaries
171 that were built with the -m32 option.
173 config SYSVIPC_COMPAT
175 depends on COMPAT && SYSVIPC
177 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
179 bool # "Support for more than 512 MB of RAM"
182 Linux can use the full amount of RAM in the system by
183 default. However, the address space of TILE processors is
184 only 4 Gigabytes large. That means that, if you have a large
185 amount of physical memory, not all of it can be "permanently
186 mapped" by the kernel. The physical memory that's not
187 permanently mapped is called "high memory".
189 If you are compiling a kernel which will never run on a
190 machine with more than 512 MB total physical RAM, answer
191 "false" here. This will result in the kernel mapping all of
192 physical memory into the top 1 GB of virtual memory space.
194 If unsure, say "true".
196 # We do not currently support disabling NUMA.
198 bool # "NUMA Memory Allocation and Scheduler Support"
199 depends on SMP && DISCONTIGMEM
202 NUMA memory allocation is required for TILE processors
203 unless booting with memory striping enabled in the
204 hypervisor, or with only a single memory controller.
205 It is recommended that this option always be enabled.
208 int "Log base 2 of the max number of memory controllers"
210 depends on NEED_MULTIPLE_NODES
212 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
213 In a system with more controllers, this value should be raised.
215 # Need 16MB areas to enable hugetlb
216 # See build-time check in arch/tile/mm/init.c.
217 config FORCE_MAX_ZONEORDER
223 prompt "Memory split" if EMBEDDED
226 Select the desired split between kernel and user memory.
228 If the address range available to the kernel is less than the
229 physical memory installed, the remaining memory will be available
230 as "high memory". Accessing high memory is a little more costly
231 than low memory, as it needs to be mapped into the kernel first.
232 Note that increasing the kernel address space limits the range
233 available to user programs, making the address space there
234 tighter. Selecting anything other than the default 3G/1G split
235 will also likely make your kernel incompatible with binary-only
238 If you are not absolutely sure what you are doing, leave this
242 bool "3.75G/0.25G user/kernel split (no kernel networking)"
244 bool "3.5G/0.5G user/kernel split"
246 bool "3G/1G user/kernel split"
247 config VMSPLIT_3G_OPT
248 bool "3G/1G user/kernel split (for full 1G low memory)"
250 bool "2G/2G user/kernel split"
252 bool "1G/3G user/kernel split"
257 default 0xF0000000 if VMSPLIT_3_75G
258 default 0xE0000000 if VMSPLIT_3_5G
259 default 0xB0000000 if VMSPLIT_3G_OPT
260 default 0x80000000 if VMSPLIT_2G
261 default 0x40000000 if VMSPLIT_1G
267 bool "Built-in kernel command line"
270 Allow for specifying boot arguments to the kernel at
271 build time. On some systems (e.g. embedded ones), it is
272 necessary or convenient to provide some or all of the
273 kernel boot arguments with the kernel itself (that is,
274 to not rely on the boot loader to provide them.)
276 To compile command line arguments into the kernel,
277 set this option to 'Y', then fill in the
278 the boot arguments in CONFIG_CMDLINE.
280 Systems with fully functional boot loaders (e.g. mboot, or
281 if booting over PCI) should leave this option set to 'N'.
284 string "Built-in kernel command string"
285 depends on CMDLINE_BOOL
288 Enter arguments here that should be compiled into the kernel
289 image and used at boot time. If the boot loader provides a
290 command line at boot time, it is appended to this string to
291 form the full kernel command line, when the system boots.
293 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
294 change this behavior.
296 In most cases, the command line (whether built-in or provided
297 by the boot loader) should specify the device for the root
300 config CMDLINE_OVERRIDE
301 bool "Built-in command line overrides boot loader arguments"
303 depends on CMDLINE_BOOL
305 Set this option to 'Y' to have the kernel ignore the boot loader
306 command line, and use ONLY the built-in command line.
308 This is used to work around broken boot loaders. This should
309 be set to 'N' under normal conditions.
311 config VMALLOC_RESERVE
316 bool "Hardwall support to allow access to user dynamic network"
320 int "Processor protection level for kernel"
324 This setting determines the processor protection level the
325 kernel will be built to run at. Generally you should use
326 the default value here.
328 endmenu # Tilera-specific configuration
337 Enable PCI root complex support, so PCIe endpoint devices can
338 be attached to the Tile chip. Many, but not all, PCI devices
339 are supported under Tilera's root complex driver.
350 source "drivers/pci/Kconfig"
352 source "drivers/pci/hotplug/Kconfig"
356 menu "Executable file formats"
363 source "fs/Kconfig.binfmt"
369 source "drivers/Kconfig"
373 source "arch/tile/Kconfig.debug"
375 source "security/Kconfig"
377 source "crypto/Kconfig"
381 source "arch/tile/kvm/Kconfig"