riscv/kernel/cpufeature.c

324 					set_bit(ext->subset_ext_ids[i], isainfo->isa);
333 			set_bit(ext->id, isainfo->isa);
338 					  unsigned long *isa2hwcap, const char *isa)
346 	isa += 4;
348 	while (*isa) {
349 		const char *ext = isa++;
350 		const char *ext_end = isa;
363 				++isa;
392 			for (; *isa && *isa != '_'; ++isa)
393 				if (unlikely(!isalnum(*isa)))
396 			ext_end = isa;
422 			 * ensure that, when isa was incremented at the start of the loop,
440 			if (!isdigit(*isa))
443 			while (isdigit(*++isa))
446 			if (tolower(*isa) != 'p')
449 			if (!isdigit(*++isa)) {
450 				--isa;
454 			while (isdigit(*++isa))
461 		 * The parser expects that at the start of an iteration isa points to the
466 		if (*isa == '_')
467 			++isa;
476 				set_bit(nr, isainfo->isa);
488 	const char *isa;
511 			rc = of_property_read_string(node, "riscv,isa", &isa);
514 				pr_warn("Unable to find \"riscv,isa\" devicetree entry\n");
518 			rc = acpi_get_riscv_isa(rhct, cpu, &isa);
525 		riscv_parse_isa_string(&this_hwcap, isainfo, isa2hwcap, isa);
530 		 * unconditionally where `i` is in riscv,isa on DT systems.
533 			set_bit(RISCV_ISA_EXT_ZICSR, isainfo->isa);
534 			set_bit(RISCV_ISA_EXT_ZIFENCEI, isainfo->isa);
535 			set_bit(RISCV_ISA_EXT_ZICNTR, isainfo->isa);
536 			set_bit(RISCV_ISA_EXT_ZIHPM, isainfo->isa);
550 			clear_bit(RISCV_ISA_EXT_v, isainfo->isa);
554 		 * All "okay" hart should have same isa. Set HWCAP based on
564 			bitmap_copy(riscv_isa, isainfo->isa, RISCV_ISA_EXT_MAX);
566 			bitmap_and(riscv_isa, riscv_isa, isainfo->isa, RISCV_ISA_EXT_MAX);
588 		if (!of_property_present(cpu_node, "riscv,isa-extensions")) {
596 			if (of_property_match_string(cpu_node, "riscv,isa-extensions",
603 						set_bit(ext->subset_ext_ids[j], isainfo->isa);
608 				set_bit(ext->id, isainfo->isa);
619 		 * All "okay" harts should have same isa. Set HWCAP based on
628 			bitmap_copy(riscv_isa, isainfo->isa, RISCV_ISA_EXT_MAX);
630 			bitmap_and(riscv_isa, riscv_isa, isainfo->isa, RISCV_ISA_EXT_MAX);
671 			pr_info("Falling back to deprecated \"riscv,isa\"\n");