+/*
+ * The canonical order of ISA extension names in the ISA string is defined in
+ * chapter 27 of the unprivileged specification.
+ *
+ * The specification uses vague wording, such as should, when it comes to
+ * ordering, so for our purposes the following rules apply:
+ *
+ * 1. All multi-letter extensions must be separated from other extensions by an
+ * underscore.
+ *
+ * 2. Additional standard extensions (starting with 'Z') must be sorted after
+ * single-letter extensions and before any higher-privileged extensions.
+ *
+ * 3. The first letter following the 'Z' conventionally indicates the most
+ * closely related alphabetical extension category, IMAFDQLCBKJTPVH.
+ * If multiple 'Z' extensions are named, they must be ordered first by
+ * category, then alphabetically within a category.
+ *
+ * 4. Standard supervisor-level extensions (starting with 'S') must be listed
+ * after standard unprivileged extensions. If multiple supervisor-level
+ * extensions are listed, they must be ordered alphabetically.
+ *
+ * 5. Standard machine-level extensions (starting with 'Zxm') must be listed
+ * after any lower-privileged, standard extensions. If multiple
+ * machine-level extensions are listed, they must be ordered
+ * alphabetically.
+ *
+ * 6. Non-standard extensions (starting with 'X') must be listed after all
+ * standard extensions. If multiple non-standard extensions are listed, they
+ * must be ordered alphabetically.
+ *
+ * An example string following the order is:
+ * rv64imadc_zifoo_zigoo_zafoo_sbar_scar_zxmbaz_xqux_xrux
+ *
+ * New entries to this struct should follow the ordering rules described above.
+ *
+ * Extension name must be all lowercase (according to device-tree binding)
+ * and strncmp() is used in match_isa_ext() to compare extension names instead
+ * of strncasecmp().
+ */
+const struct riscv_isa_ext_data __initconst riscv_isa_ext[] = {
+ RISCV_ISA_EXT_DATA(i, RISCV_ISA_EXT_i),
+ RISCV_ISA_EXT_DATA(m, RISCV_ISA_EXT_m),
+ RISCV_ISA_EXT_DATA(a, RISCV_ISA_EXT_a),
+ RISCV_ISA_EXT_DATA(f, RISCV_ISA_EXT_f),
+ RISCV_ISA_EXT_DATA(d, RISCV_ISA_EXT_d),
+ RISCV_ISA_EXT_DATA(q, RISCV_ISA_EXT_q),
+ RISCV_ISA_EXT_DATA(c, RISCV_ISA_EXT_c),
+ RISCV_ISA_EXT_DATA(h, RISCV_ISA_EXT_h),
+ RISCV_ISA_EXT_DATA(zicntr, RISCV_ISA_EXT_ZICNTR),
+ RISCV_ISA_EXT_DATA(zicsr, RISCV_ISA_EXT_ZICSR),
+ RISCV_ISA_EXT_DATA(zifencei, RISCV_ISA_EXT_ZIFENCEI),
+ RISCV_ISA_EXT_DATA(zihintpause, RISCV_ISA_EXT_ZIHINTPAUSE),
+ RISCV_ISA_EXT_DATA(zihpm, RISCV_ISA_EXT_ZIHPM),
+ RISCV_ISA_EXT_DATA(zbb, RISCV_ISA_EXT_ZBB),
+ RISCV_ISA_EXT_DATA(smaia, RISCV_ISA_EXT_SMAIA),
+ RISCV_ISA_EXT_DATA(ssaia, RISCV_ISA_EXT_SSAIA),
+};
+
+static const struct riscv_isa_ext_data __initconst required_extensions[] = {
+ RISCV_ISA_EXT_DATA(i, RISCV_ISA_EXT_i),
+ RISCV_ISA_EXT_DATA(m, RISCV_ISA_EXT_m),
+ RISCV_ISA_EXT_DATA(a, RISCV_ISA_EXT_a),
+ RISCV_ISA_EXT_DATA(f, RISCV_ISA_EXT_f),
+ RISCV_ISA_EXT_DATA(d, RISCV_ISA_EXT_d),
