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nehemiah RNG: Switch to using FPU_KERN_NOCTX

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Reviewed by:	kib
Differential Revision:	https://reviews.freebsd.org/D41583

(cherry picked from commit 7aec088cbce8381bd5bf730419b8fdcddf43b08d)
This commit is contained in:
John Baldwin 2023-08-25 12:34:16 -07:00
parent 0609ca2f19
commit 90ac116d5e
1 changed files with 2 additions and 22 deletions
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24
sys/dev/random/nehemiah.c
View file

@ -43,8 +43,6 @@
#include <dev/random/randomdev.h>
static void random_nehemiah_init(void);
static void random_nehemiah_deinit(void);
static u_int random_nehemiah_read(void *, u_int);
static struct random_source random_nehemiah = {
@ -53,8 +51,6 @@ static struct random_source random_nehemiah = {
.rs_read = random_nehemiah_read
};
static struct fpu_kern_ctx *fpu_ctx_save;
/* This H/W source never stores more than 8 bytes in one go */
/* ARGSUSED */
static __inline size_t
@ -75,20 +71,6 @@ VIA_RNG_store(void *buf)
return (0);
}
static void
random_nehemiah_init(void)
{
fpu_ctx_save = fpu_kern_alloc_ctx(FPU_KERN_NORMAL);
}
static void
random_nehemiah_deinit(void)
{
fpu_kern_free_ctx(fpu_ctx_save);
}
/* It is specifically allowed that buf is a multiple of sizeof(long) */
static u_int
random_nehemiah_read(void *buf, u_int c)
@ -97,14 +79,14 @@ random_nehemiah_read(void *buf, u_int c)
size_t count, ret;
uint64_t tmp;
fpu_kern_enter(curthread, fpu_ctx_save, FPU_KERN_NORMAL);
fpu_kern_enter(curthread, NULL, FPU_KERN_NORMAL | FPU_KERN_NOCTX);
b = buf;
for (count = c; count > 0; count -= ret) {
ret = MIN(VIA_RNG_store(&tmp), count);
memcpy(b, &tmp, ret);
b += ret;
}
fpu_kern_leave(curthread, fpu_ctx_save);
fpu_kern_leave(curthread, NULL);
return (c);
}
@ -119,13 +101,11 @@ nehemiah_modevent(module_t mod, int type, void *unused)
if (via_feature_rng & VIA_HAS_RNG) {
random_source_register(&random_nehemiah);
printf("random: fast provider: \"%s\"\n", random_nehemiah.rs_ident);
random_nehemiah_init();
}
break;
case MOD_UNLOAD:
if (via_feature_rng & VIA_HAS_RNG) {
random_nehemiah_deinit();
random_source_deregister(&random_nehemiah);
}
break;