1b27829489
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 <jan.glauber@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
/*
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* include/asm-s390/timex.h
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*
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* S390 version
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* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
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*
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* Derived from "include/asm-i386/timex.h"
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* Copyright (C) 1992, Linus Torvalds
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*/
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#ifndef _ASM_S390_TIMEX_H
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#define _ASM_S390_TIMEX_H
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/* Inline functions for clock register access. */
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static inline int set_clock(__u64 time)
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{
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int cc;
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asm volatile(
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" sck 0(%2)\n"
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" ipm %0\n"
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" srl %0,28\n"
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: "=d" (cc) : "m" (time), "a" (&time) : "cc");
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return cc;
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}
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static inline int store_clock(__u64 *time)
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{
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int cc;
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asm volatile(
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" stck 0(%2)\n"
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" ipm %0\n"
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" srl %0,28\n"
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: "=d" (cc), "=m" (*time) : "a" (time) : "cc");
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return cc;
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}
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static inline void set_clock_comparator(__u64 time)
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{
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asm volatile("sckc 0(%1)" : : "m" (time), "a" (&time));
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}
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static inline void store_clock_comparator(__u64 *time)
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{
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asm volatile("stckc 0(%1)" : "=m" (*time) : "a" (time));
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}
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#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
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typedef unsigned long long cycles_t;
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static inline unsigned long long get_clock (void)
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{
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unsigned long long clk;
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#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
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asm volatile("stck %0" : "=Q" (clk) : : "cc");
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#else /* __GNUC__ */
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asm volatile("stck 0(%1)" : "=m" (clk) : "a" (&clk) : "cc");
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#endif /* __GNUC__ */
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return clk;
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}
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static inline void get_clock_extended(void *dest)
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{
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typedef struct { unsigned long long clk[2]; } __clock_t;
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#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
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asm volatile("stcke %0" : "=Q" (*((__clock_t *)dest)) : : "cc");
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#else /* __GNUC__ */
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asm volatile("stcke 0(%1)" : "=m" (*((__clock_t *)dest))
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: "a" ((__clock_t *)dest) : "cc");
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#endif /* __GNUC__ */
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}
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static inline cycles_t get_cycles(void)
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{
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return (cycles_t) get_clock() >> 2;
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}
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int get_sync_clock(unsigned long long *clock);
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void init_cpu_timer(void);
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#endif
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