LXR linux/drivers/char/hw

   1#
   2# Hardware Random Number Generator (RNG) configuration
   3#
   4
   5config HW_RANDOM
   6        tristate "Hardware Random Number Generator Core support"
   7        default m
   8        ---help---
   9          Hardware Random Number Generator Core infrastructure.
  10
  11          To compile this driver as a module, choose M here: the
  12          module will be called rng-core.  This provides a device
  13          that's usually called /dev/hw_random, and which exposes one
  14          of possibly several hardware random number generators.
  15
  16          These hardware random number generators do not feed directly
  17          into the kernel's random number generator.  That is usually
  18          handled by the "rngd" daemon.  Documentation/hw_random.txt
  19          has more information.
  20
  21          If unsure, say Y.
  22
  23config HW_RANDOM_TIMERIOMEM
  24        tristate "Timer IOMEM HW Random Number Generator support"
  25        depends on HW_RANDOM && HAS_IOMEM
  26        ---help---
  27          This driver provides kernel-side support for a generic Random
  28          Number Generator used by reading a 'dumb' iomem address that
  29          is to be read no faster than, for example, once a second;
  30          the default FPGA bitstream on the TS-7800 has such functionality.
  31
  32          To compile this driver as a module, choose M here: the
  33          module will be called timeriomem-rng.
  34
  35          If unsure, say Y.
  36
  37config HW_RANDOM_INTEL
  38        tristate "Intel HW Random Number Generator support"
  39        depends on HW_RANDOM && (X86 || IA64) && PCI
  40        default HW_RANDOM
  41        ---help---
  42          This driver provides kernel-side support for the Random Number
  43          Generator hardware found on Intel i8xx-based motherboards.
  44
  45          To compile this driver as a module, choose M here: the
  46          module will be called intel-rng.
  47
  48          If unsure, say Y.
  49
  50config HW_RANDOM_AMD
  51        tristate "AMD HW Random Number Generator support"
  52        depends on HW_RANDOM && (X86 || PPC_MAPLE) && PCI
  53        default HW_RANDOM
  54        ---help---
  55          This driver provides kernel-side support for the Random Number
  56          Generator hardware found on AMD 76x-based motherboards.
  57
  58          To compile this driver as a module, choose M here: the
  59          module will be called amd-rng.
  60
  61          If unsure, say Y.
  62
  63config HW_RANDOM_ATMEL
  64        tristate "Atmel Random Number Generator support"
  65        depends on HW_RANDOM && ARCH_AT91SAM9G45
  66        default HW_RANDOM
  67        ---help---
  68          This driver provides kernel-side support for the Random Number
  69          Generator hardware found on Atmel AT91 devices.
  70
  71          To compile this driver as a module, choose M here: the
  72          module will be called atmel-rng.
  73
  74          If unsure, say Y.
  75
  76config HW_RANDOM_GEODE
  77        tristate "AMD Geode HW Random Number Generator support"
  78        depends on HW_RANDOM && X86_32 && PCI
  79        default HW_RANDOM
  80        ---help---
  81          This driver provides kernel-side support for the Random Number
  82          Generator hardware found on the AMD Geode LX.
  83
  84          To compile this driver as a module, choose M here: the
  85          module will be called geode-rng.
  86
  87          If unsure, say Y.
  88
  89config HW_RANDOM_N2RNG
  90        tristate "Niagara2 Random Number Generator support"
  91        depends on HW_RANDOM && SPARC64
  92        default HW_RANDOM
  93        ---help---
  94          This driver provides kernel-side support for the Random Number
  95          Generator hardware found on Niagara2 cpus.
  96
  97          To compile this driver as a module, choose M here: the
  98          module will be called n2-rng.
  99
 100          If unsure, say Y.
 101
 102config HW_RANDOM_VIA
 103        tristate "VIA HW Random Number Generator support"
 104        depends on HW_RANDOM && X86
 105        default HW_RANDOM
 106        ---help---
 107          This driver provides kernel-side support for the Random Number
 108          Generator hardware found on VIA based motherboards.
 109
 110          To compile this driver as a module, choose M here: the
 111          module will be called via-rng.
 112
 113          If unsure, say Y.
 114
 115config HW_RANDOM_IXP4XX
 116        tristate "Intel IXP4xx NPU HW Random Number Generator support"
 117        depends on HW_RANDOM && ARCH_IXP4XX
 118        default HW_RANDOM
 119        ---help---
 120          This driver provides kernel-side support for the Random
 121          Number Generator hardware found on the Intel IXP4xx NPU.
 122
 123          To compile this driver as a module, choose M here: the
 124          module will be called ixp4xx-rng.
 125
 126          If unsure, say Y.
 127
 128config HW_RANDOM_OMAP
 129        tristate "OMAP Random Number Generator support"
 130        depends on HW_RANDOM && (ARCH_OMAP16XX || ARCH_OMAP2)
 131        default HW_RANDOM
 132        ---help---
 133          This driver provides kernel-side support for the Random Number
 134          Generator hardware found on OMAP16xx and OMAP24xx multimedia
 135          processors.
 136
 137          To compile this driver as a module, choose M here: the
 138          module will be called omap-rng.
 139
 140          If unsure, say Y.
 141
 142config HW_RANDOM_OCTEON
 143        tristate "Octeon Random Number Generator support"
 144        depends on HW_RANDOM && CPU_CAVIUM_OCTEON
 145        default HW_RANDOM
 146        ---help---
 147          This driver provides kernel-side support for the Random Number
 148          Generator hardware found on Octeon processors.
 149
 150          To compile this driver as a module, choose M here: the
 151          module will be called octeon-rng.
 152
 153          If unsure, say Y.
 154
 155config HW_RANDOM_PASEMI
 156        tristate "PA Semi HW Random Number Generator support"
 157        depends on HW_RANDOM && PPC_PASEMI
 158        default HW_RANDOM
 159        ---help---
 160          This driver provides kernel-side support for the Random Number
 161          Generator hardware found on PA Semi PWRficient SoCs.
 162
 163          To compile this driver as a module, choose M here: the
 164          module will be called pasemi-rng.
 165
 166          If unsure, say Y.
 167
 168config HW_RANDOM_VIRTIO
 169        tristate "VirtIO Random Number Generator support"
 170        depends on HW_RANDOM && VIRTIO
 171        ---help---
 172          This driver provides kernel-side support for the virtual Random Number
 173          Generator hardware.
 174
 175          To compile this driver as a module, choose M here: the
 176          module will be called virtio-rng.  If unsure, say N.
 177
 178config HW_RANDOM_TX4939
 179        tristate "TX4939 Random Number Generator support"
 180        depends on HW_RANDOM && SOC_TX4939
 181        default HW_RANDOM
 182        ---help---
 183          This driver provides kernel-side support for the Random Number
 184          Generator hardware found on TX4939 SoC.
 185
 186          To compile this driver as a module, choose M here: the
 187          module will be called tx4939-rng.
 188
 189          If unsure, say Y.
 190
 191config HW_RANDOM_MXC_RNGA
 192        tristate "Freescale i.MX RNGA Random Number Generator"
 193        depends on HW_RANDOM && ARCH_HAS_RNGA
 194        ---help---
 195          This driver provides kernel-side support for the Random Number
 196          Generator hardware found on Freescale i.MX processors.
 197
 198          To compile this driver as a module, choose M here: the
 199          module will be called mxc-rnga.
 200
 201          If unsure, say Y.
 202
 203config HW_RANDOM_NOMADIK
 204        tristate "ST-Ericsson Nomadik Random Number Generator support"
 205        depends on HW_RANDOM && PLAT_NOMADIK
 206        ---help---
 207          This driver provides kernel-side support for the Random Number
 208          Generator hardware found on ST-Ericsson SoCs (8815 and 8500).
 209
 210          To compile this driver as a module, choose M here: the
 211          module will be called nomadik-rng.
 212
 213          If unsure, say Y.
 214
 215config HW_RANDOM_PICOXCELL
 216        tristate "Picochip picoXcell true random number generator support"
 217        depends on HW_RANDOM && ARCH_PICOXCELL && PICOXCELL_PC3X3
 218        ---help---
 219          This driver provides kernel-side support for the Random Number
 220          Generator hardware found on Picochip PC3x3 and later devices.
 221
 222          To compile this driver as a module, choose M here: the
 223          module will be called picoxcell-rng.
 224
 225          If unsure, say Y.
 226
 227config HW_RANDOM_PPC4XX
 228        tristate "PowerPC 4xx generic true random number generator support"
 229        depends on HW_RANDOM && PPC && 4xx
 230        ---help---
 231         This driver provides the kernel-side support for the TRNG hardware
 232         found in the security function of some PowerPC 4xx SoCs.
 233
 234         To compile this driver as a module, choose M here: the
 235         module will be called ppc4xx-rng.
 236
 237         If unsure, say N.
 238
 239config UML_RANDOM
 240        depends on UML
 241        tristate "Hardware random number generator"
 242        help
 243          This option enables UML's "hardware" random number generator.  It
 244          attaches itself to the host's /dev/random, supplying as much entropy
 245          as the host has, rather than the small amount the UML gets from its
 246          own drivers.  It registers itself as a standard hardware random number
 247          generator, major 10, minor 183, and the canonical device name is
 248          /dev/hwrng.
 249          The way to make use of this is to install the rng-tools package
 250          (check your distro, or download from
 251          http://sourceforge.net/projects/gkernel/).  rngd periodically reads
 252          /dev/hwrng and injects the entropy into /dev/random.
 253