| (libc_uefi_usage)= | |
| # Using libc for UEFI | |
| ## Using the UEFI C library | |
| Once you have finished {ref}`building<libc_uefi_building>` the UEFI C library | |
| it can be used to run libc or libm functions inside of UEFI Images. Currently, | |
| not all C standard functions are supported in UEFI. Consult the {ref}`list of | |
| supported functions<libc_uefi_support>` for a comprehensive list. | |
| :::{note} | |
| LLVM-libc support for UEFI is currently in the early bring-up phase. For | |
| the current source of truth on implemented functions, please refer to | |
| `libc/config/uefi/entrypoints.txt` in the source tree. | |
| ::: | |