Root/arch/tile/Kconfig

1# For a description of the syntax of this configuration file,
2# see Documentation/kbuild/config-language.txt.
3
4config TILE
5    def_bool y
6    select HAVE_KVM if !TILEGX
7    select GENERIC_FIND_FIRST_BIT
8    select GENERIC_FIND_NEXT_BIT
9    select USE_GENERIC_SMP_HELPERS
10    select CC_OPTIMIZE_FOR_SIZE
11    select HAVE_GENERIC_HARDIRQS
12    select GENERIC_IRQ_PROBE
13    select GENERIC_PENDING_IRQ if SMP
14
15# FIXME: investigate whether we need/want these options.
16# select HAVE_IOREMAP_PROT
17# select HAVE_OPTPROBES
18# select HAVE_REGS_AND_STACK_ACCESS_API
19# select HAVE_HW_BREAKPOINT
20# select PERF_EVENTS
21# select HAVE_USER_RETURN_NOTIFIER
22# config NO_BOOTMEM
23# config ARCH_SUPPORTS_DEBUG_PAGEALLOC
24# config HUGETLB_PAGE_SIZE_VARIABLE
25
26config MMU
27    def_bool y
28
29config GENERIC_CSUM
30    def_bool y
31
32config SEMAPHORE_SLEEPERS
33    def_bool y
34
35config HAVE_ARCH_ALLOC_REMAP
36    def_bool y
37
38config HAVE_SETUP_PER_CPU_AREA
39    def_bool y
40
41config NEED_PER_CPU_PAGE_FIRST_CHUNK
42        def_bool y
43
44config SYS_SUPPORTS_HUGETLBFS
45    def_bool y
46
47config GENERIC_TIME
48    def_bool y
49
50config GENERIC_CLOCKEVENTS
51    def_bool y
52
53# FIXME: tilegx can implement a more efficent rwsem.
54config RWSEM_GENERIC_SPINLOCK
55    def_bool y
56
57# We have a very flat architecture from a migration point of view,
58# so save boot time by presetting this (particularly useful on tile-sim).
59config DEFAULT_MIGRATION_COST
60    int
61    default "10000000"
62
63# We only support gcc 4.4 and above, so this should work.
64config ARCH_SUPPORTS_OPTIMIZED_INLINING
65    def_bool y
66
67config ARCH_PHYS_ADDR_T_64BIT
68    def_bool y
69
70config ARCH_DMA_ADDR_T_64BIT
71    def_bool y
72
73config LOCKDEP_SUPPORT
74    def_bool y
75
76config STACKTRACE_SUPPORT
77    def_bool y
78    select STACKTRACE
79
80# We use discontigmem for now; at some point we may want to switch
81# to sparsemem (Tilera bug 7996).
82config ARCH_DISCONTIGMEM_ENABLE
83    def_bool y
84
85config ARCH_DISCONTIGMEM_DEFAULT
86    def_bool y
87
88config TRACE_IRQFLAGS_SUPPORT
89    def_bool y
90
91config STRICT_DEVMEM
92    def_bool y
93
94# SMP is required for Tilera Linux.
95config SMP
96    def_bool y
97
98# Allow checking for compile-time determined overflow errors in
99# copy_from_user(). There are still unprovable places in the
100# generic code as of 2.6.34, so this option is not really compatible
101# with -Werror, which is more useful in general.
102config DEBUG_COPY_FROM_USER
103    def_bool n
104
105config HVC_TILE
106    select HVC_DRIVER
107    def_bool y
108
109# Please note: TILE-Gx support is not yet finalized; this is
110# the preliminary support. TILE-Gx drivers are only provided
111# with the alpha or beta test versions for Tilera customers.
112config TILEGX
113    depends on EXPERIMENTAL
114    bool "Building with TILE-Gx (64-bit) compiler and toolchain"
115
116config 64BIT
117    depends on TILEGX
118    def_bool y
119
120config ARCH_DEFCONFIG
121    string
122    default "arch/tile/configs/tile_defconfig" if !TILEGX
123    default "arch/tile/configs/tilegx_defconfig" if TILEGX
124
125source "init/Kconfig"
126
127menu "Tilera-specific configuration"
128
129config NR_CPUS
130    int "Maximum number of tiles (2-255)"
131    range 2 255
132    depends on SMP
133    default "64"
134    ---help---
135      Building with 64 is the recommended value, but a slightly
136      smaller kernel memory footprint results from using a smaller
137      value on chips with fewer tiles.
138
139source "kernel/time/Kconfig"
140
141source "kernel/Kconfig.hz"
142
143config KEXEC
144    bool "kexec system call"
145    ---help---
146      kexec is a system call that implements the ability to shutdown your
147      current kernel, and to start another kernel. It is like a reboot
148      but it is independent of the system firmware. It is used
149      to implement the "mboot" Tilera booter.
150
151      The name comes from the similarity to the exec system call.
152
153config COMPAT
154    bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
155    depends on TILEGX
156    select COMPAT_BINFMT_ELF
157    default y
158    ---help---
159      If enabled, the kernel will support running TILE-Gx binaries
160      that were built with the -m32 option.
161
162config SYSVIPC_COMPAT
163    def_bool y
164    depends on COMPAT && SYSVIPC
165
166# We do not currently support disabling HIGHMEM on tile64 and tilepro.
167config HIGHMEM
168    bool # "Support for more than 512 MB of RAM"
169    default !TILEGX
170    ---help---
171      Linux can use the full amount of RAM in the system by
172      default. However, the address space of TILE processors is
173      only 4 Gigabytes large. That means that, if you have a large
174      amount of physical memory, not all of it can be "permanently
175      mapped" by the kernel. The physical memory that's not
176      permanently mapped is called "high memory".
177
178      If you are compiling a kernel which will never run on a
179      machine with more than 512 MB total physical RAM, answer
180      "false" here. This will result in the kernel mapping all of
181      physical memory into the top 1 GB of virtual memory space.
182
183      If unsure, say "true".
184
185# We do not currently support disabling NUMA.
186config NUMA
187    bool # "NUMA Memory Allocation and Scheduler Support"
188    depends on SMP && DISCONTIGMEM
189    default y
190    ---help---
191      NUMA memory allocation is required for TILE processors
192      unless booting with memory striping enabled in the
193      hypervisor, or with only a single memory controller.
194      It is recommended that this option always be enabled.
195
196config NODES_SHIFT
197    int "Log base 2 of the max number of memory controllers"
198    default 2
199    depends on NEED_MULTIPLE_NODES
200    ---help---
201      By default, 2, i.e. 2^2 == 4 DDR2 controllers.
202      In a system with more controllers, this value should be raised.
203
204# Need 16MB areas to enable hugetlb
205# See build-time check in arch/tile/mm/init.c.
206config FORCE_MAX_ZONEORDER
207    int
208    default 9
209
210choice
211    depends on !TILEGX
212    prompt "Memory split" if EXPERT
213    default VMSPLIT_3G
214    ---help---
215      Select the desired split between kernel and user memory.
216
217      If the address range available to the kernel is less than the
218      physical memory installed, the remaining memory will be available
219      as "high memory". Accessing high memory is a little more costly
220      than low memory, as it needs to be mapped into the kernel first.
221      Note that increasing the kernel address space limits the range
222      available to user programs, making the address space there
223      tighter. Selecting anything other than the default 3G/1G split
224      will also likely make your kernel incompatible with binary-only
225      kernel modules.
226
227      If you are not absolutely sure what you are doing, leave this
228      option alone!
229
230    config VMSPLIT_3_75G
231        bool "3.75G/0.25G user/kernel split (no kernel networking)"
232    config VMSPLIT_3_5G
233        bool "3.5G/0.5G user/kernel split"
234    config VMSPLIT_3G
235        bool "3G/1G user/kernel split"
236    config VMSPLIT_3G_OPT
237        bool "3G/1G user/kernel split (for full 1G low memory)"
238    config VMSPLIT_2G
239        bool "2G/2G user/kernel split"
240    config VMSPLIT_1G
241        bool "1G/3G user/kernel split"
242endchoice
243
244config PAGE_OFFSET
245    hex
246    default 0xF0000000 if VMSPLIT_3_75G
247    default 0xE0000000 if VMSPLIT_3_5G
248    default 0xB0000000 if VMSPLIT_3G_OPT
249    default 0x80000000 if VMSPLIT_2G
250    default 0x40000000 if VMSPLIT_1G
251    default 0xC0000000
252
253source "mm/Kconfig"
254
255config CMDLINE_BOOL
256    bool "Built-in kernel command line"
257    default n
258    ---help---
259      Allow for specifying boot arguments to the kernel at
260      build time. On some systems (e.g. embedded ones), it is
261      necessary or convenient to provide some or all of the
262      kernel boot arguments with the kernel itself (that is,
263      to not rely on the boot loader to provide them.)
264
265      To compile command line arguments into the kernel,
266      set this option to 'Y', then fill in the
267      the boot arguments in CONFIG_CMDLINE.
268
269      Systems with fully functional boot loaders (e.g. mboot, or
270      if booting over PCI) should leave this option set to 'N'.
271
272config CMDLINE
273    string "Built-in kernel command string"
274    depends on CMDLINE_BOOL
275    default ""
276    ---help---
277      Enter arguments here that should be compiled into the kernel
278      image and used at boot time. If the boot loader provides a
279      command line at boot time, it is appended to this string to
280      form the full kernel command line, when the system boots.
281
282      However, you can use the CONFIG_CMDLINE_OVERRIDE option to
283      change this behavior.
284
285      In most cases, the command line (whether built-in or provided
286      by the boot loader) should specify the device for the root
287      file system.
288
289config CMDLINE_OVERRIDE
290    bool "Built-in command line overrides boot loader arguments"
291    default n
292    depends on CMDLINE_BOOL
293    ---help---
294      Set this option to 'Y' to have the kernel ignore the boot loader
295      command line, and use ONLY the built-in command line.
296
297      This is used to work around broken boot loaders. This should
298      be set to 'N' under normal conditions.
299
300config VMALLOC_RESERVE
301    hex
302    default 0x1000000
303
304config HARDWALL
305    bool "Hardwall support to allow access to user dynamic network"
306    default y
307
308config KERNEL_PL
309    int "Processor protection level for kernel"
310    range 1 2
311    default "1"
312    ---help---
313      This setting determines the processor protection level the
314      kernel will be built to run at. Generally you should use
315      the default value here.
316
317endmenu # Tilera-specific configuration
318
319menu "Bus options"
320
321config PCI
322    bool "PCI support"
323    default y
324    select PCI_DOMAINS
325    ---help---
326      Enable PCI root complex support, so PCIe endpoint devices can
327      be attached to the Tile chip. Many, but not all, PCI devices
328      are supported under Tilera's root complex driver.
329
330config PCI_DOMAINS
331    bool
332
333config NO_IOMEM
334    def_bool !PCI
335
336config NO_IOPORT
337    def_bool !PCI
338
339source "drivers/pci/Kconfig"
340
341source "drivers/pci/hotplug/Kconfig"
342
343endmenu
344
345menu "Executable file formats"
346
347# only elf supported
348config KCORE_ELF
349    def_bool y
350    depends on PROC_FS
351
352source "fs/Kconfig.binfmt"
353
354endmenu
355
356source "net/Kconfig"
357
358source "drivers/Kconfig"
359
360source "fs/Kconfig"
361
362source "arch/tile/Kconfig.debug"
363
364source "security/Kconfig"
365
366source "crypto/Kconfig"
367
368source "lib/Kconfig"
369
370source "arch/tile/kvm/Kconfig"
371

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