Function sbi_rt::nacl_sync_csr
source · pub fn nacl_sync_csr(csr_num: usize) -> SbiRetExpand description
Synchronize CSRs in the nested acceleration shared memory.
This is an optional function that is only available if the SBI_NACL_FEAT_SYNC_CSR feature is available.
§Parameters
The parameter csr_num specifies the set of RISC-V H-extension CSRs to be synchronized.
If csr_num is all-ones bitwise, then all RISC-V H-extension CSRs implemented by the SBI implementation (or L0 hypervisor) are synchronized.
If (csr_num & 0x300) == 0x200 and csr_num < 0x1000 then only a single
RISC-V H-extension CSR specified by the csr_num parameter is synchronized.
§Return value
The possible error codes returned in SbiRet.error are shown in the table below:
| Error code | Description |
|---|---|
SbiRet::success() | CSRs synchronized successfully. |
SbiRet::not_supported() | SBI_NACL_FEAT_SYNC_CSR feature is not available. |
SbiRet::invalid_param() | csr_num is not all-ones bitwise and either: * (csr_num & 0x300) != 0x200 or * csr_num >= 0x1000 or * csr_num is not implemented by the SBI implementation |
SbiRet::no_shmem() | Nested acceleration shared memory not available. |
This function is defined in RISC-V SBI Specification chapter 15.7.