riscv/kernel/cpufeature.c

405  * 1. All multi-letter extensions must be separated from other extensions by an
409  *    single-letter extensions and before any higher-privileged extensions.
411  * 3. The first letter following the 'Z' conventionally indicates the most
594 			/* Single letter extensions get set in hwcap */  in riscv_resolve_isa()
636 			 * As multi-letter extensions must be split from other multi-letter  in riscv_parse_isa_string()
637 			 * extensions with an "_", the end of a multi-letter extension will  in riscv_parse_isa_string()
639 			 * multi-letter extension.  in riscv_parse_isa_string()
647 			 * Workaround for invalid single-letter 's' & 'u' (QEMU).  in riscv_parse_isa_string()
650 			 * multi-letter extension in the ISA string begins with  in riscv_parse_isa_string()
664 			 * As multi-letter extensions must be split from other multi-letter  in riscv_parse_isa_string()
665 			 * extensions with an "_", the end of a multi-letter extension will  in riscv_parse_isa_string()
667 			 * multi-letter extension.  in riscv_parse_isa_string()
706 			 * Things are a little easier for single-letter extensions, as they  in riscv_parse_isa_string()
714 			 * we have a multi-letter extension's _, or the start of an  in riscv_parse_isa_string()
752 		 * where the succeeding extension is a multi-letter prefixed with an "_".  in riscv_parse_isa_string()