Harald Welte wrote:
> This is a cosmetic change, fixing the MODULE_DESCRIPTION() of via-rng.c
Coincidentally, I was trying to make my RNG work for x86_64 today and I
was wondering about this. How can multiple RNGs in current dual-processor
setups and in the future multicore Nano be handled?
The MSR wizardry in via_rng_init doesn't seem to work on my Nano. I'm
simply skipping it with the patch below, because my RNG is enabled
by default. I don't know the proper way to initialize it because of
lacking documentation. Would you happen to know a better way of doing
this?
diff -u linux-2.6.30-rc5.orig/drivers/char/hw_random/Kconfig
linux-2.6.30-rc5/drivers/char/hw_random/Kconfig
--- linux-2.6.30-rc5.orig/drivers/char/hw_random/Kconfig 2009-04-23
20:13:55.000000000 +0000
+++ linux-2.6.30-rc5/drivers/char/hw_random/Kconfig 2009-05-10
09:59:59.000000000 +0000
@@ -88,7 +88,7 @@
config HW_RANDOM_VIA
tristate "VIA HW Random Number Generator support"
- depends on HW_RANDOM && X86_32
+ depends on HW_RANDOM && X86
default HW_RANDOM
---help---
This driver provides kernel-side support for the Random Number
diff -u linux-2.6.30-rc5.orig/drivers/char/hw_random/via-rng.c
linux-2.6.30-rc5/drivers/char/hw_random/via-rng.c
--- linux-2.6.30-rc5.orig/drivers/char/hw_random/via-rng.c 2009-03-23
23:12:14.000000000 +0000
+++ linux-2.6.30-rc5/drivers/char/hw_random/via-rng.c 2009-05-10
15:33:23.000000000 +0000
@@ -132,6 +132,17 @@
struct cpuinfo_x86 *c = &cpu_data(0);
u32 lo, hi, old_lo;
+ /* Nano */
+ if ((c->x86 == 6) && (c->x86_model >= 0xf)) {
+ if (!cpu_has_xstore_enabled) {
+ printk(KERN_ERR PFX
+ "don't know how to enable VIA Nano RNG,"
+ " aborting\n");
+ return -ENODEV;
+ }
+ return 0;
+ }
+
/* Control the RNG via MSR. Tread lightly and pay very close
* close attention to values written, as the reserved fields
* are documented to be "undefined and unpredictable"; but it
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