}
}
- /*
- * For all possible cpus, we have already validated in
- * the boot process that they at least contain "rv" and
- * whichever of "32"/"64" this kernel supports, and so this
- * section can be skipped.
- */
- isa += 4;
-
- while (*isa) {
- const char *ext = isa++;
- const char *ext_end = isa;
- bool ext_long = false, ext_err = false;
-
- switch (*ext) {
- case 's':
- /*
- * Workaround for invalid single-letter 's' & 'u'(QEMU).
- * No need to set the bit in riscv_isa as 's' & 'u' are
- * not valid ISA extensions. It works until multi-letter
- * extension starting with "Su" appears.
- */
- if (ext[-1] != '_' && ext[1] == 'u') {
- ++isa;
- ext_err = true;
- break;
- }
- fallthrough;
- case 'S':
- case 'x':
- case 'X':
- case 'z':
- case 'Z':
- /*
- * Before attempting to parse the extension itself, we find its end.
- * As multi-letter extensions must be split from other multi-letter
- * extensions with an "_", the end of a multi-letter extension will
- * either be the null character or the "_" at the start of the next
- * multi-letter extension.
- *
- * Next, as the extensions version is currently ignored, we
- * eliminate that portion. This is done by parsing backwards from
- * the end of the extension, removing any numbers. This may be a
- * major or minor number however, so the process is repeated if a
- * minor number was found.
- *
- * ext_end is intended to represent the first character *after* the
- * name portion of an extension, but will be decremented to the last
- * character itself while eliminating the extensions version number.
- * A simple re-increment solves this problem.
- */
- ext_long = true;
- for (; *isa && *isa != '_'; ++isa)
- if (unlikely(!isalnum(*isa)))
- ext_err = true;
-
- ext_end = isa;
- if (unlikely(ext_err))
- break;
-
- if (!isdigit(ext_end[-1]))
- break;
-
- while (isdigit(*--ext_end))
- ;
-
- if (tolower(ext_end[0]) != 'p' || !isdigit(ext_end[-1])) {
- ++ext_end;
- break;
- }
-
- while (isdigit(*--ext_end))
- ;
-
- ++ext_end;
- break;
- default:
- /*
- * Things are a little easier for single-letter extensions, as they
- * are parsed forwards.
- *
- * After checking that our starting position is valid, we need to
- * ensure that, when isa was incremented at the start of the loop,
- * that it arrived at the start of the next extension.
- *
- * If we are already on a non-digit, there is nothing to do. Either
- * we have a multi-letter extension's _, or the start of an
- * extension.
- *
- * Otherwise we have found the current extension's major version
- * number. Parse past it, and a subsequent p/minor version number
- * if present. The `p` extension must not appear immediately after
- * a number, so there is no fear of missing it.
- *
- */
- if (unlikely(!isalpha(*ext))) {
- ext_err = true;
- break;
- }
-
- if (!isdigit(*isa))
- break;
-
- while (isdigit(*++isa))
- ;
-
- if (tolower(*isa) != 'p')
- break;
-
- if (!isdigit(*++isa)) {
- --isa;
- break;
- }
-
- while (isdigit(*++isa))
- ;
-
- break;
- }
-
- /*
- * The parser expects that at the start of an iteration isa points to the
- * first character of the next extension. As we stop parsing an extension
- * on meeting a non-alphanumeric character, an extra increment is needed
- * where the succeeding extension is a multi-letter prefixed with an "_".
- */
- if (*isa == '_')
- ++isa;
-
- #define SET_ISA_EXT_MAP(name, bit) \
- do { \
- if ((ext_end - ext == sizeof(name) - 1) && \
- !strncasecmp(ext, name, sizeof(name) - 1) && \
- riscv_isa_extension_check(bit)) \
- set_bit(bit, isainfo->isa); \
- } while (false) \
-
- if (unlikely(ext_err))
- continue;
- if (!ext_long) {
- int nr = tolower(*ext) - 'a';
-
- if (riscv_isa_extension_check(nr)) {
- this_hwcap |= isa2hwcap[nr];
- set_bit(nr, isainfo->isa);
- }
- } else {
- /* sorted alphabetically */
- SET_ISA_EXT_MAP("smaia", RISCV_ISA_EXT_SMAIA);
- SET_ISA_EXT_MAP("ssaia", RISCV_ISA_EXT_SSAIA);
- SET_ISA_EXT_MAP("sscofpmf", RISCV_ISA_EXT_SSCOFPMF);
- SET_ISA_EXT_MAP("sstc", RISCV_ISA_EXT_SSTC);
- SET_ISA_EXT_MAP("svinval", RISCV_ISA_EXT_SVINVAL);
- SET_ISA_EXT_MAP("svnapot", RISCV_ISA_EXT_SVNAPOT);
- SET_ISA_EXT_MAP("svpbmt", RISCV_ISA_EXT_SVPBMT);
- SET_ISA_EXT_MAP("zba", RISCV_ISA_EXT_ZBA);
- SET_ISA_EXT_MAP("zbb", RISCV_ISA_EXT_ZBB);
- SET_ISA_EXT_MAP("zbs", RISCV_ISA_EXT_ZBS);
- SET_ISA_EXT_MAP("zicbom", RISCV_ISA_EXT_ZICBOM);
- SET_ISA_EXT_MAP("zicboz", RISCV_ISA_EXT_ZICBOZ);
- SET_ISA_EXT_MAP("zihintpause", RISCV_ISA_EXT_ZIHINTPAUSE);
- }
- #undef SET_ISA_EXT_MAP
- }
+ riscv_parse_isa_string(&this_hwcap, isainfo, isa2hwcap, isa);
/*
- * Linux requires the following extensions, so we may as well
- * always set them.
- */
- set_bit(RISCV_ISA_EXT_ZICSR, isainfo->isa);
- set_bit(RISCV_ISA_EXT_ZIFENCEI, isainfo->isa);
-
- /*
* These ones were as they were part of the base ISA when the
* port & dt-bindings were upstreamed, and so can be set
* unconditionally where `i` is in riscv,isa on DT systems.