arch/riscv/uabi.rst

1 .. SPDX-License-Identifier: GPL-2.0
3 RISC-V Linux User ABI
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14 #. Single-letter extensions come first, in canonical order.
17 #. All multi-letter extensions will be separated from other extensions by an
21    single-letter extensions and before any higher-privileged extensions.
29 #. Standard supervisor-level extensions (starting with 'S') will be listed
30    after standard unprivileged extensions.  If multiple supervisor-level
33 #. Standard machine-level extensions (starting with 'Zxm') will be listed
34    after any lower-privileged, standard extensions. If multiple machine-level
37 #. Non-standard extensions (starting with 'X') will be listed after all standard
38    extensions. If multiple non-standard extensions are listed, they will be
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49 RISC-V ISA extensions recognized by the kernel and implemented on all harts. The
57 Similarly, for S-mode extensions, presence in one of these lines does not
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