36 	struct powernv_rng *rng;  in powernv_hwrng_present()  local
38 	rng = get_cpu_var(powernv_rng);  in powernv_hwrng_present()
39 	put_cpu_var(rng);  in powernv_hwrng_present()
40 	return rng != NULL;  in powernv_hwrng_present()
43 static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val)  in rng_whiten()  argument
51 	val ^= rng->mask;  in rng_whiten()
54 	rng->mask = (rng->mask << 1) | (parity & 1);  in rng_whiten()
61 	struct powernv_rng *rng;  in powernv_get_random_real_mode()  local
63 	rng = raw_cpu_read(powernv_rng);  in powernv_get_random_real_mode()
65 	*v = rng_whiten(rng, in_rm64(rng->regs_real));  in powernv_get_random_real_mode()
72 	struct powernv_rng *rng;  in powernv_get_random_long()  local
74 	rng = get_cpu_var(powernv_rng);  in powernv_get_random_long()
76 	*v = rng_whiten(rng, in_be64(rng->regs));  in powernv_get_random_long()
78 	put_cpu_var(rng);  in powernv_get_random_long()
84 static __init void rng_init_per_cpu(struct powernv_rng *rng,  in rng_init_per_cpu()  argument
96 			per_cpu(powernv_rng, cpu) = rng;  in rng_init_per_cpu()
103 	struct powernv_rng *rng;  in rng_create()  local
107 	rng = kzalloc(sizeof(*rng), GFP_KERNEL);  in rng_create()
108 	if (!rng)  in rng_create()
112 		kfree(rng);  in rng_create()
116 	rng->regs_real = (void __iomem *)res.start;  in rng_create()
118 	rng->regs = of_iomap(dn, 0);  in rng_create()
119 	if (!rng->regs) {  in rng_create()
120 		kfree(rng);  in rng_create()
124 	val = in_be64(rng->regs);  in rng_create()
125 	rng->mask = val;  in rng_create()
127 	rng_init_per_cpu(rng, dn);  in rng_create()