diff options
Diffstat (limited to 'include/vdso/datapage.h')
| -rw-r--r-- | include/vdso/datapage.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/vdso/datapage.h b/include/vdso/datapage.h index d04d394db064..b85f24cac3f5 100644 --- a/include/vdso/datapage.h +++ b/include/vdso/datapage.h @@ -77,6 +77,10 @@ struct vdso_timestamp { * vdso_data will be accessed by 64 bit and compat code at the same time * so we should be careful before modifying this structure. * + * The ordering of the struct members is optimized to have fast access to the + * often required struct members which are related to CLOCK_REALTIME and + * CLOCK_MONOTONIC. This information is stored in the first cache lines. + * * @basetime is used to store the base time for the system wide time getter * VVAR page. * @@ -113,6 +117,16 @@ struct vdso_data { struct arch_vdso_data arch_data; }; +/** + * struct vdso_rng_data - vdso RNG state information + * @generation: counter representing the number of RNG reseeds + * @is_ready: boolean signaling whether the RNG is initialized + */ +struct vdso_rng_data { + u64 generation; + u8 is_ready; +}; + /* * We use the hidden visibility to prevent the compiler from generating a GOT * relocation. Not only is going through a GOT useless (the entry couldn't and @@ -124,6 +138,7 @@ struct vdso_data { */ extern struct vdso_data _vdso_data[CS_BASES] __attribute__((visibility("hidden"))); extern struct vdso_data _timens_data[CS_BASES] __attribute__((visibility("hidden"))); +extern struct vdso_rng_data _vdso_rng_data __attribute__((visibility("hidden"))); /** * union vdso_data_store - Generic vDSO data page |