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TOMOYO Linux Cross Reference
Linux/arch/powerpc/platforms/pseries/rng.c

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  1 /*
  2  * Copyright 2013, Michael Ellerman, IBM Corporation.
  3  *
  4  * This program is free software; you can redistribute it and/or
  5  * modify it under the terms of the GNU General Public License
  6  * as published by the Free Software Foundation; either version
  7  * 2 of the License, or (at your option) any later version.
  8  */
  9 
 10 #define pr_fmt(fmt)     "pseries-rng: " fmt
 11 
 12 #include <linux/kernel.h>
 13 #include <linux/of.h>
 14 #include <asm/archrandom.h>
 15 #include <asm/machdep.h>
 16 #include <asm/plpar_wrappers.h>
 17 
 18 
 19 static int pseries_get_random_long(unsigned long *v)
 20 {
 21         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 22 
 23         if (plpar_hcall(H_RANDOM, retbuf) == H_SUCCESS) {
 24                 *v = retbuf[0];
 25                 return 1;
 26         }
 27 
 28         return 0;
 29 }
 30 
 31 static __init int rng_init(void)
 32 {
 33         struct device_node *dn;
 34 
 35         dn = of_find_compatible_node(NULL, NULL, "ibm,random");
 36         if (!dn)
 37                 return -ENODEV;
 38 
 39         pr_info("Registering arch random hook.\n");
 40 
 41         ppc_md.get_random_long = pseries_get_random_long;
 42 
 43         return 0;
 44 }
 45 subsys_initcall(rng_init);
 46 

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