1 # For a description of the syntax of this configuration file,
2 # see Documentation/kbuild/kconfig-language.txt.
6 select HAVE_KVM if !TILEGX
7 select GENERIC_FIND_FIRST_BIT
8 select USE_GENERIC_SMP_HELPERS
9 select CC_OPTIMIZE_FOR_SIZE
10 select HAVE_GENERIC_HARDIRQS
11 select GENERIC_IRQ_PROBE
12 select GENERIC_PENDING_IRQ if SMP
13 select GENERIC_IRQ_SHOW
16 # FIXME: investigate whether we need/want these options.
17 # select HAVE_IOREMAP_PROT
18 # select HAVE_OPTPROBES
19 # select HAVE_REGS_AND_STACK_ACCESS_API
20 # select HAVE_HW_BREAKPOINT
22 # select HAVE_USER_RETURN_NOTIFIER
24 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
25 # config HUGETLB_PAGE_SIZE_VARIABLE
33 config SEMAPHORE_SLEEPERS
36 config HAVE_ARCH_ALLOC_REMAP
39 config HAVE_SETUP_PER_CPU_AREA
42 config NEED_PER_CPU_PAGE_FIRST_CHUNK
45 config SYS_SUPPORTS_HUGETLBFS
51 config GENERIC_CLOCKEVENTS
54 # FIXME: tilegx can implement a more efficient rwsem.
55 config RWSEM_GENERIC_SPINLOCK
58 # We have a very flat architecture from a migration point of view,
59 # so save boot time by presetting this (particularly useful on tile-sim).
60 config DEFAULT_MIGRATION_COST
64 # We only support gcc 4.4 and above, so this should work.
65 config ARCH_SUPPORTS_OPTIMIZED_INLINING
68 config ARCH_PHYS_ADDR_T_64BIT
71 config ARCH_DMA_ADDR_T_64BIT
74 config LOCKDEP_SUPPORT
77 config STACKTRACE_SUPPORT
81 # We use discontigmem for now; at some point we may want to switch
82 # to sparsemem (Tilera bug 7996).
83 config ARCH_DISCONTIGMEM_ENABLE
86 config ARCH_DISCONTIGMEM_DEFAULT
89 config TRACE_IRQFLAGS_SUPPORT
95 # SMP is required for Tilera Linux.
99 # Allow checking for compile-time determined overflow errors in
100 # copy_from_user(). There are still unprovable places in the
101 # generic code as of 2.6.34, so this option is not really compatible
102 # with -Werror, which is more useful in general.
103 config DEBUG_COPY_FROM_USER
110 # Please note: TILE-Gx support is not yet finalized; this is
111 # the preliminary support. TILE-Gx drivers are only provided
112 # with the alpha or beta test versions for Tilera customers.
114 depends on EXPERIMENTAL
115 bool "Building with TILE-Gx (64-bit) compiler and toolchain"
121 config ARCH_DEFCONFIG
123 default "arch/tile/configs/tile_defconfig" if !TILEGX
124 default "arch/tile/configs/tilegx_defconfig" if TILEGX
126 source "init/Kconfig"
128 menu "Tilera-specific configuration"
131 int "Maximum number of tiles (2-255)"
136 Building with 64 is the recommended value, but a slightly
137 smaller kernel memory footprint results from using a smaller
138 value on chips with fewer tiles.
140 source "kernel/time/Kconfig"
142 source "kernel/Kconfig.hz"
145 bool "kexec system call"
147 kexec is a system call that implements the ability to shutdown your
148 current kernel, and to start another kernel. It is like a reboot
149 but it is independent of the system firmware. It is used
150 to implement the "mboot" Tilera booter.
152 The name comes from the similarity to the exec system call.
155 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
157 select COMPAT_BINFMT_ELF
160 If enabled, the kernel will support running TILE-Gx binaries
161 that were built with the -m32 option.
163 config SYSVIPC_COMPAT
165 depends on COMPAT && SYSVIPC
167 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
169 bool # "Support for more than 512 MB of RAM"
172 Linux can use the full amount of RAM in the system by
173 default. However, the address space of TILE processors is
174 only 4 Gigabytes large. That means that, if you have a large
175 amount of physical memory, not all of it can be "permanently
176 mapped" by the kernel. The physical memory that's not
177 permanently mapped is called "high memory".
179 If you are compiling a kernel which will never run on a
180 machine with more than 512 MB total physical RAM, answer
181 "false" here. This will result in the kernel mapping all of
182 physical memory into the top 1 GB of virtual memory space.
184 If unsure, say "true".
186 # We do not currently support disabling NUMA.
188 bool # "NUMA Memory Allocation and Scheduler Support"
189 depends on SMP && DISCONTIGMEM
192 NUMA memory allocation is required for TILE processors
193 unless booting with memory striping enabled in the
194 hypervisor, or with only a single memory controller.
195 It is recommended that this option always be enabled.
198 int "Log base 2 of the max number of memory controllers"
200 depends on NEED_MULTIPLE_NODES
202 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
203 In a system with more controllers, this value should be raised.
207 prompt "Memory split" if EXPERT
210 Select the desired split between kernel and user memory.
212 If the address range available to the kernel is less than the
213 physical memory installed, the remaining memory will be available
214 as "high memory". Accessing high memory is a little more costly
215 than low memory, as it needs to be mapped into the kernel first.
216 Note that increasing the kernel address space limits the range
217 available to user programs, making the address space there
218 tighter. Selecting anything other than the default 3G/1G split
219 will also likely make your kernel incompatible with binary-only
222 If you are not absolutely sure what you are doing, leave this
226 bool "3.75G/0.25G user/kernel split (no kernel networking)"
228 bool "3.5G/0.5G user/kernel split"
230 bool "3G/1G user/kernel split"
232 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
234 bool "2.5G/1.5G user/kernel split"
236 bool "2.25G/1.75G user/kernel split"
238 bool "2G/2G user/kernel split"
240 bool "1G/3G user/kernel split"
245 default 0xF0000000 if VMSPLIT_3_75G
246 default 0xE0000000 if VMSPLIT_3_5G
247 default 0xB0000000 if VMSPLIT_2_75G
248 default 0xA0000000 if VMSPLIT_2_5G
249 default 0x90000000 if VMSPLIT_2_25G
250 default 0x80000000 if VMSPLIT_2G
251 default 0x40000000 if VMSPLIT_1G
257 bool "Built-in kernel command line"
260 Allow for specifying boot arguments to the kernel at
261 build time. On some systems (e.g. embedded ones), it is
262 necessary or convenient to provide some or all of the
263 kernel boot arguments with the kernel itself (that is,
264 to not rely on the boot loader to provide them.)
266 To compile command line arguments into the kernel,
267 set this option to 'Y', then fill in the
268 the boot arguments in CONFIG_CMDLINE.
270 Systems with fully functional boot loaders (e.g. mboot, or
271 if booting over PCI) should leave this option set to 'N'.
274 string "Built-in kernel command string"
275 depends on CMDLINE_BOOL
278 Enter arguments here that should be compiled into the kernel
279 image and used at boot time. If the boot loader provides a
280 command line at boot time, it is appended to this string to
281 form the full kernel command line, when the system boots.
283 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
284 change this behavior.
286 In most cases, the command line (whether built-in or provided
287 by the boot loader) should specify the device for the root
290 config CMDLINE_OVERRIDE
291 bool "Built-in command line overrides boot loader arguments"
293 depends on CMDLINE_BOOL
295 Set this option to 'Y' to have the kernel ignore the boot loader
296 command line, and use ONLY the built-in command line.
298 This is used to work around broken boot loaders. This should
299 be set to 'N' under normal conditions.
301 config VMALLOC_RESERVE
306 bool "Hardwall support to allow access to user dynamic network"
310 int "Processor protection level for kernel"
314 This setting determines the processor protection level the
315 kernel will be built to run at. Generally you should use
316 the default value here.
318 endmenu # Tilera-specific configuration
327 Enable PCI root complex support, so PCIe endpoint devices can
328 be attached to the Tile chip. Many, but not all, PCI devices
329 are supported under Tilera's root complex driver.
340 source "drivers/pci/Kconfig"
343 bool "Support for hot-pluggable devices"
345 Say Y here if you want to plug devices into your computer while
346 the system is running, and be able to use them quickly. In many
347 cases, the devices can likewise be unplugged at any time too.
348 One well-known example of this is USB.
350 source "drivers/pci/hotplug/Kconfig"
354 menu "Executable file formats"
361 source "fs/Kconfig.binfmt"
367 source "drivers/Kconfig"
371 source "arch/tile/Kconfig.debug"
373 source "security/Kconfig"
375 source "crypto/Kconfig"
379 source "arch/tile/kvm/Kconfig"