| `0` | _SYSINFO_CPU_ZICSR_ | `Zicsr` extension (`I` sub-extension) available when set (via top's <<_cpu_extension_riscv_zicsr>> generic)
| `0` | _SYSINFO_CPU_ZICSR_ | `Zicsr` extension (`I` sub-extension) available when set (via top's <<_cpu_extension_riscv_zicsr>> generic)
| `1` | _SYSINFO_CPU_ZIFENCEI_ | `Zifencei` extension (`I` sub-extension) available when set (via top's <<_cpu_extension_riscv_zifencei>> generic)
| `1` | _SYSINFO_CPU_ZIFENCEI_ | `Zifencei` extension (`I` sub-extension) available when set (via top's <<_cpu_extension_riscv_zifencei>> generic)
| `2` | _SYSINFO_CPU_ZMMUL_ | `Zmmul` extension (`M` sub-extension) available when set (via top's <<_cpu_extension_riscv_zmmul>> generic)
| `2` | _SYSINFO_CPU_ZMMUL_ | `Zmmul` extension (`M` sub-extension) available when set (via top's <<_cpu_extension_riscv_zmmul>> generic)
| `3` | _SYSINFO_CPU_ZBB_ | `Zbb` extension (`B` sub-extension) available when set (via top's <<_cpu_extension_riscv_zbb>> generic)
| `5` | _SYSINFO_CPU_ZFINX_ | `Zfinx` extension (`F` sub-/alternative-extension) available when set (via top's <<_cpu_extension_riscv_zfinx>> generic)
| `5` | _SYSINFO_CPU_ZFINX_ | `Zfinx` extension (`F` sub-/alternative-extension) available when set (via top's <<_cpu_extension_riscv_zfinx>> generic)
| `6` | _SYSINFO_CPU_ZXSCNT_ | Custom extension - _Small_ CPU counters: `[m]cycle` & `[m]instret` CSRs have less than 64-bit when set (via top's <<_cpu_cnt_width>> generic)
| `6` | _SYSINFO_CPU_ZXSCNT_ | Custom extension - _Small_ CPU counters: `[m]cycle` & `[m]instret` CSRs have less than 64-bit when set (via top's <<_cpu_cnt_width>> generic)
| `7` | _SYSINFO_CPU_ZXNOCNT_ | Custom extension - _NO_ CPU counters: `[m]cycle` & `[m]instret` CSRs are NOT available at all when set (via top's <<_cpu_cnt_width>> generic)
| `7` | _SYSINFO_CPU_ZXNOCNT_ | Custom extension - _NO_ CPU counters: `[m]cycle` & `[m]instret` CSRs are NOT available at all when set (via top's <<_cpu_cnt_width>> generic)
| `8` | _SYSINFO_CPU_PMP_ | `PMP` (physical memory protection) extension available when set (via top's <<_>> generic)
| `8` | _SYSINFO_CPU_PMP_ | `PMP` (physical memory protection) extension available when set (via top's <<_>> generic)
| `9` | _SYSINFO_CPU_HPM_ | `HPM` (hardware performance monitors) extension available when set (via top's <<_>> generic)
| `9` | _SYSINFO_CPU_HPM_ | `HPM` (hardware performance monitors) extension available when set (via top's <<_>> generic)