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 LOCKDEP_SUPPORT
64 config STACKTRACE_SUPPORT
68 # We use discontigmem for now; at some point we may want to switch
69 # to sparsemem (Tilera bug 7996).
70 config ARCH_DISCONTIGMEM_ENABLE
73 config ARCH_DISCONTIGMEM_DEFAULT
76 config TRACE_IRQFLAGS_SUPPORT
82 # SMP is required for Tilera Linux.
86 # Allow checking for compile-time determined overflow errors in
87 # copy_from_user(). There are still unprovable places in the
88 # generic code as of 2.6.34, so this option is not really compatible
89 # with -Werror, which is more useful in general.
90 config DEBUG_COPY_FROM_USER
99 select HAVE_KVM if !TILEGX
100 select GENERIC_FIND_FIRST_BIT
101 select GENERIC_FIND_NEXT_BIT
102 select USE_GENERIC_SMP_HELPERS
103 select CC_OPTIMIZE_FOR_SIZE
105 # FIXME: investigate whether we need/want these options.
106 # select HAVE_IOREMAP_PROT
107 # select HAVE_OPTPROBES
108 # select HAVE_REGS_AND_STACK_ACCESS_API
109 # select HAVE_HW_BREAKPOINT
111 # select HAVE_USER_RETURN_NOTIFIER
113 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
114 # config HUGETLB_PAGE_SIZE_VARIABLE
117 mainmenu "Linux/TILE Kernel Configuration"
119 # Please note: TILE-Gx support is not yet finalized; this is
120 # the preliminary support. TILE-Gx drivers are only provided
121 # with the alpha or beta test versions for Tilera customers.
123 depends on EXPERIMENTAL
124 bool "Building with TILE-Gx (64-bit) compiler and toolchain"
130 config ARCH_DEFCONFIG
132 default "arch/tile/configs/tile_defconfig" if !TILEGX
133 default "arch/tile/configs/tilegx_defconfig" if TILEGX
135 source "init/Kconfig"
137 menu "Tilera-specific configuration"
140 int "Maximum number of tiles (2-255)"
145 Building with 64 is the recommended value, but a slightly
146 smaller kernel memory footprint results from using a smaller
147 value on chips with fewer tiles.
149 source "kernel/time/Kconfig"
151 source "kernel/Kconfig.hz"
154 bool "kexec system call"
156 kexec is a system call that implements the ability to shutdown your
157 current kernel, and to start another kernel. It is like a reboot
158 but it is independent of the system firmware. It is used
159 to implement the "mboot" Tilera booter.
161 The name comes from the similarity to the exec system call.
164 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
166 select COMPAT_BINFMT_ELF
169 If enabled, the kernel will support running TILE-Gx binaries
170 that were built with the -m32 option.
172 config SYSVIPC_COMPAT
174 depends on COMPAT && SYSVIPC
176 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
178 bool # "Support for more than 512 MB of RAM"
181 Linux can use the full amount of RAM in the system by
182 default. However, the address space of TILE processors is
183 only 4 Gigabytes large. That means that, if you have a large
184 amount of physical memory, not all of it can be "permanently
185 mapped" by the kernel. The physical memory that's not
186 permanently mapped is called "high memory".
188 If you are compiling a kernel which will never run on a
189 machine with more than 512 MB total physical RAM, answer
190 "false" here. This will result in the kernel mapping all of
191 physical memory into the top 1 GB of virtual memory space.
193 If unsure, say "true".
195 # We do not currently support disabling NUMA.
197 bool # "NUMA Memory Allocation and Scheduler Support"
198 depends on SMP && DISCONTIGMEM
201 NUMA memory allocation is required for TILE processors
202 unless booting with memory striping enabled in the
203 hypervisor, or with only a single memory controller.
204 It is recommended that this option always be enabled.
207 int "Log base 2 of the max number of memory controllers"
209 depends on NEED_MULTIPLE_NODES
211 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
212 In a system with more controllers, this value should be raised.
214 # Need 16MB areas to enable hugetlb
215 # See build-time check in arch/tile/mm/init.c.
216 config FORCE_MAX_ZONEORDER
222 prompt "Memory split" if EMBEDDED
225 Select the desired split between kernel and user memory.
227 If the address range available to the kernel is less than the
228 physical memory installed, the remaining memory will be available
229 as "high memory". Accessing high memory is a little more costly
230 than low memory, as it needs to be mapped into the kernel first.
231 Note that increasing the kernel address space limits the range
232 available to user programs, making the address space there
233 tighter. Selecting anything other than the default 3G/1G split
234 will also likely make your kernel incompatible with binary-only
237 If you are not absolutely sure what you are doing, leave this
241 bool "3.75G/0.25G user/kernel split (no kernel networking)"
243 bool "3.5G/0.5G user/kernel split"
245 bool "3G/1G user/kernel split"
246 config VMSPLIT_3G_OPT
247 bool "3G/1G user/kernel split (for full 1G low memory)"
249 bool "2G/2G user/kernel split"
251 bool "1G/3G user/kernel split"
256 default 0xF0000000 if VMSPLIT_3_75G
257 default 0xE0000000 if VMSPLIT_3_5G
258 default 0xB0000000 if VMSPLIT_3G_OPT
259 default 0x80000000 if VMSPLIT_2G
260 default 0x40000000 if VMSPLIT_1G
266 bool "Built-in kernel command line"
269 Allow for specifying boot arguments to the kernel at
270 build time. On some systems (e.g. embedded ones), it is
271 necessary or convenient to provide some or all of the
272 kernel boot arguments with the kernel itself (that is,
273 to not rely on the boot loader to provide them.)
275 To compile command line arguments into the kernel,
276 set this option to 'Y', then fill in the
277 the boot arguments in CONFIG_CMDLINE.
279 Systems with fully functional boot loaders (e.g. mboot, or
280 if booting over PCI) should leave this option set to 'N'.
283 string "Built-in kernel command string"
284 depends on CMDLINE_BOOL
287 Enter arguments here that should be compiled into the kernel
288 image and used at boot time. If the boot loader provides a
289 command line at boot time, it is appended to this string to
290 form the full kernel command line, when the system boots.
292 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
293 change this behavior.
295 In most cases, the command line (whether built-in or provided
296 by the boot loader) should specify the device for the root
299 config CMDLINE_OVERRIDE
300 bool "Built-in command line overrides boot loader arguments"
302 depends on CMDLINE_BOOL
304 Set this option to 'Y' to have the kernel ignore the boot loader
305 command line, and use ONLY the built-in command line.
307 This is used to work around broken boot loaders. This should
308 be set to 'N' under normal conditions.
310 config VMALLOC_RESERVE
315 bool "Hardwall support to allow access to user dynamic network"
319 int "Processor protection level for kernel"
323 This setting determines the processor protection level the
324 kernel will be built to run at. Generally you should use
325 the default value here.
327 endmenu # Tilera-specific configuration
337 source "drivers/pci/Kconfig"
339 source "drivers/pci/hotplug/Kconfig"
343 menu "Executable file formats"
350 source "fs/Kconfig.binfmt"
356 source "drivers/Kconfig"
360 source "arch/tile/Kconfig.debug"
362 source "security/Kconfig"
364 source "crypto/Kconfig"
368 source "arch/tile/kvm/Kconfig"