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
21 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
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
28 select HAVE_DEBUG_STACKOVERFLOW
29 select ARCH_WANT_FRAME_POINTERS
31 # FIXME: investigate whether we need/want these options.
32 # select HAVE_IOREMAP_PROT
33 # select HAVE_OPTPROBES
34 # select HAVE_REGS_AND_STACK_ACCESS_API
35 # select HAVE_HW_BREAKPOINT
37 # select HAVE_USER_RETURN_NOTIFIER
39 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
40 # config HUGETLB_PAGE_SIZE_VARIABLE
48 config HAVE_ARCH_ALLOC_REMAP
51 config HAVE_SETUP_PER_CPU_AREA
54 config NEED_PER_CPU_PAGE_FIRST_CHUNK
57 config SYS_SUPPORTS_HUGETLBFS
60 # Support for additional huge page sizes besides HPAGE_SIZE.
61 # The software support is currently only present in the TILE-Gx
62 # hypervisor. TILEPro in any case does not support page sizes
63 # larger than the default HPAGE_SIZE.
64 config HUGETLB_SUPER_PAGES
65 depends on HUGETLB_PAGE && TILEGX
68 config GENERIC_TIME_VSYSCALL
71 # FIXME: tilegx can implement a more efficient rwsem.
72 config RWSEM_GENERIC_SPINLOCK
75 # We only support gcc 4.4 and above, so this should work.
76 config ARCH_SUPPORTS_OPTIMIZED_INLINING
79 config ARCH_PHYS_ADDR_T_64BIT
82 config ARCH_DMA_ADDR_T_64BIT
85 config NEED_DMA_MAP_STATE
88 config ARCH_HAS_DMA_SET_COHERENT_MASK
91 config LOCKDEP_SUPPORT
94 config STACKTRACE_SUPPORT
98 # We use discontigmem for now; at some point we may want to switch
99 # to sparsemem (Tilera bug 7996).
100 config ARCH_DISCONTIGMEM_ENABLE
103 config ARCH_DISCONTIGMEM_DEFAULT
106 config TRACE_IRQFLAGS_SUPPORT
112 # SMP is required for Tilera Linux.
119 select HVC_IRQ if TILEGX
123 bool "Building for TILE-Gx (64-bit) processor"
124 select HAVE_FUNCTION_TRACER
125 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
126 select HAVE_FUNCTION_GRAPH_TRACER
127 select HAVE_DYNAMIC_FTRACE
128 select HAVE_FTRACE_MCOUNT_RECORD
130 select HAVE_KRETPROBES
131 select HAVE_ARCH_KGDB
139 config ARCH_DEFCONFIG
141 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
142 default "arch/tile/configs/tilegx_defconfig" if TILEGX
144 source "init/Kconfig"
146 source "kernel/Kconfig.freezer"
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 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
316 source "kernel/Kconfig.preempt"
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"
377 Since MDE 4.2, the Tilera hypervisor runs the kernel
378 at PL2 by default. If running under an older hypervisor,
379 or as a KVM guest, you must run at PL1. (The current
380 hypervisor may also be recompiled with "make HV_PL=2" to
381 allow it to run a kernel at PL1, but clients running at PL1
382 are not expected to be supported indefinitely.)
384 If you're not sure, don't change the default.
386 source "arch/tile/gxio/Kconfig"
388 endmenu # Tilera-specific configuration
396 select GENERIC_PCI_IOMAP
397 select TILE_GXIO_TRIO if TILEGX
398 select PCI_MSI if TILEGX
400 Enable PCI root complex support, so PCIe endpoint devices can
401 be attached to the Tile chip. Many, but not all, PCI devices
402 are supported under Tilera's root complex driver.
414 bool "PCI I/O space support"
419 Enable PCI I/O space support on TILEGx. Since the PCI I/O space
420 is used by few modern PCIe endpoint devices, its support is disabled
421 by default to save the TRIO PIO Region resource for other purposes.
423 source "drivers/pci/Kconfig"
425 source "drivers/pci/pcie/Kconfig"
428 tristate "Tilera USB host adapter support"
432 select TILE_GXIO_USB_HOST
434 Provides USB host adapter support for the built-in EHCI and OHCI
435 interfaces on TILE-Gx chips.
437 source "drivers/pci/hotplug/Kconfig"
441 menu "Executable file formats"
443 source "fs/Kconfig.binfmt"
449 source "drivers/Kconfig"
453 source "arch/tile/Kconfig.debug"
455 source "security/Kconfig"
457 source "crypto/Kconfig"
461 source "arch/tile/kvm/Kconfig"