openharmony/kernel_linux
1
0
Fork 0
mirror of https://gitee.com/openharmony/kernel_linux synced 2025-04-12 20:28:57 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

hwrng: doc - Fix device node name reference /dev/hw_random => /dev/hwrng

Browse Source 
In April 2009, commit d405640 ("Driver Core: misc: add node name support
for misc devices.") inadvertently changed the device node name from
/dev/hw_random to /dev/hwrng.  Since 6 years has passed since the change
it seems unpractical to change it back, as this node name is probably
considered ABI by now.  So instead, we'll just change the documentation
to match the current situation.

NB: It looks like rng-tools have already been updated.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Kieran Bingham <kieranbingham@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Lee Jones 2015-09-17 14:45:51 +01:00 committed by Herbert Xu
parent 4dd17c9c8a
commit e9e23158f2
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
Documentation/hw_random.txt
View File

@ -3,7 +3,7 @@ Introduction:
The hw_random framework is software that makes use of a The hw_random framework is software that makes use of a
special hardware feature on your CPU or motherboard, special hardware feature on your CPU or motherboard,
a Random Number Generator (RNG). The software has two parts: a Random Number Generator (RNG). The software has two parts:
a core providing the /dev/hw_random character device and its a core providing the /dev/hwrng character device and its
sysfs support, plus a hardware-specific driver that plugs sysfs support, plus a hardware-specific driver that plugs
into that core. into that core.
@ -14,7 +14,7 @@ Introduction:
http://sourceforge.net/projects/gkernel/ http://sourceforge.net/projects/gkernel/
Those tools use /dev/hw_random to fill the kernel entropy pool, Those tools use /dev/hwrng to fill the kernel entropy pool,
which is used internally and exported by the /dev/urandom and which is used internally and exported by the /dev/urandom and
/dev/random special files. /dev/random special files.
@ -32,13 +32,13 @@ Theory of operation:
The rng-tools package uses such tests in "rngd", and lets you The rng-tools package uses such tests in "rngd", and lets you
run them by hand with a "rngtest" utility. run them by hand with a "rngtest" utility.
/dev/hw_random is char device major 10, minor 183. /dev/hwrng is char device major 10, minor 183.
CLASS DEVICE. There is a /sys/class/misc/hw_random node with CLASS DEVICE. There is a /sys/class/misc/hw_random node with
two unique attributes, "rng_available" and "rng_current". The two unique attributes, "rng_available" and "rng_current". The
"rng_available" attribute lists the hardware-specific drivers "rng_available" attribute lists the hardware-specific drivers
available, while "rng_current" lists the one which is currently available, while "rng_current" lists the one which is currently
connected to /dev/hw_random. If your system has more than one connected to /dev/hwrng. If your system has more than one
RNG available, you may change the one used by writing a name from RNG available, you may change the one used by writing a name from
the list in "rng_available" into "rng_current". the list in "rng_available" into "rng_current".