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[S390] Support for s390 Pseudo Random Number Generator

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Starting with the z9 the CPU Cryptographic Assist Facility comes with
an integrated Pseudo Random Number Generator. The generator creates
random numbers by an algorithm similar to the ANSI X9.17 standard.
The pseudo-random numbers can be accessed via a character device driver
node called /dev/prandom. Similar to /dev/urandom any amount of bytes
can be read from the device without blocking.

Signed-off-by: Jan Glauber <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
This commit is contained in:
Jan Glauber 2007-02-05 21:18:22 +01:00 • committed by Martin Schwidefsky
commit 1b27829489
6 changed files with 230 additions and 0 deletions
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12
include/asm-s390/timex.h
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@ -62,6 +62,18 @@ static inline unsigned long long get_clock (void)
return clk;
}
static inline void get_clock_extended(void *dest)
{
typedef struct { unsigned long long clk[2]; } __clock_t;
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
asm volatile("stcke %0" : "=Q" (*((__clock_t *)dest)) : : "cc");
#else /* __GNUC__ */
asm volatile("stcke 0(%1)" : "=m" (*((__clock_t *)dest))
: "a" ((__clock_t *)dest) : "cc");
#endif /* __GNUC__ */
}
static inline cycles_t get_cycles(void)
{
return (cycles_t) get_clock() >> 2;