Function sbi_rt::nacl_sync_hfence
source · pub fn nacl_sync_hfence(entry_index: usize) -> SbiRetExpand description
Synchronize HFENCEs in the nested acceleration shared memory.
This is an optional function that is only available if the SBI_NACL_FEAT_SYNC_HFENCE feature is available.
§Parameters
The parameter entry_index specifies the set of nested HFENCE entries to be synchronized.
If entry_index is all-ones bitwise, then all nested HFENCE entries are synchronized.
If entry_index < (3840 / XLEN) then only a single nested HFENCE entry specified by the entry_index parameter is synchronized
§Return value
The possible error codes returned in SbiRet.error are shown in the table below:
| Error code | Description |
|---|---|
SbiRet::success() | HFENCEs synchronized successfully. |
SbiRet::not_supported() | SBI_NACL_FEAT_SYNC_HFENCE feature is not available. |
SbiRet::invalid_param() | entry_index is not all-ones bitwise and entry_index >= (3840 / XLEN). |
SbiRet::no_shmem() | Nested acceleration shared memory not available. |
This function is defined in RISC-V SBI Specification chapter 15.8.