riscv/kernel/cpufeature.c

44 /* Per-cpu ISA extensions. */
131 /* Used to declare extensions that are a superset of other extensions (Zvbb for instance) */
209  * existence of the CSR, and treat it as a subset of those other extensions.
225  * 1. All multi-letter extensions must be separated from other extensions by an
228  * 2. Additional standard extensions (starting with 'Z') must be sorted after
229  *    single-letter extensions and before any higher-privileged extensions.
233  *    If multiple 'Z' extensions are named, they must be ordered first by
236  * 3. Standard supervisor-level extensions (starting with 'S') must be listed
237  *    after standard unprivileged extensions.  If multiple supervisor-level
238  *    extensions are listed, they must be ordered alphabetically.
240  * 4. Standard machine-level extensions (starting with 'Zxm') must be listed
241  *    after any lower-privileged, standard extensions.  If multiple
242  *    machine-level extensions are listed, they must be ordered
245  * 5. Non-standard extensions (starting with 'X') must be listed after all
246  *    standard extensions. If multiple non-standard extensions are listed, they
331 		 * If this is a bundle, enable all the ISA extensions that  in match_isa_ext()
342 		 * This is valid even for bundle extensions which uses the RISCV_ISA_EXT_INVALID id  in match_isa_ext()
371 			 * not valid ISA extensions. It works unless the first  in riscv_parse_isa_string()
388 			 * As multi-letter extensions must be split from other multi-letter  in riscv_parse_isa_string()
389 			 * extensions with an "_", the end of a multi-letter extension will  in riscv_parse_isa_string()
393 			 * Next, as the extensions version is currently ignored, we  in riscv_parse_isa_string()
401 			 * character itself while eliminating the extensions version number.  in riscv_parse_isa_string()
431 			 * Things are a little easier for single-letter extensions, as they  in riscv_parse_isa_string()
601 		if (!of_property_present(cpu_node, "riscv,isa-extensions")) {  in riscv_fill_hwcap_from_ext_list()
609 			if (of_property_match_string(cpu_node, "riscv,isa-extensions",  in riscv_fill_hwcap_from_ext_list()
623 				/* Only single letter extensions get set in hwcap */  in riscv_fill_hwcap_from_ext_list()
713 	pr_info("riscv: base ISA extensions %s\n", print_str);  in riscv_fill_hwcap()