diff options
Diffstat (limited to 'crypto/riscvcap.c')
-rw-r--r-- | crypto/riscvcap.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/crypto/riscvcap.c b/crypto/riscvcap.c new file mode 100644 index 0000000000..1cbfb4a574 --- /dev/null +++ b/crypto/riscvcap.c @@ -0,0 +1,86 @@ +/* + * Copyright 2022 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the Apache License 2.0 (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +#include <stdlib.h> +#include <string.h> +#include <ctype.h> +#include <stdint.h> +#include <openssl/crypto.h> +#include "internal/cryptlib.h" + +#define OPENSSL_RISCVCAP_IMPL +#include "crypto/riscv_arch.h" + +static void parse_env(const char *envstr); +static void strtoupper(char *str); + +uint32_t OPENSSL_rdtsc(void) +{ + return 0; +} + +size_t OPENSSL_instrument_bus(unsigned int *out, size_t cnt) +{ + return 0; +} + +size_t OPENSSL_instrument_bus2(unsigned int *out, size_t cnt, size_t max) +{ + return 0; +} + +static void strtoupper(char *str) +{ + for (char *x = str; *x; ++x) + *x = toupper(*x); +} + +/* parse_env() parses a RISC-V architecture string. An example of such a string + * is "rv64gc_zba_zbb_zbc_zbs". Currently, the rv64gc part is ignored + * and we simply search for "_[extension]" in the arch string to see if we + * should enable a given extension. + */ +#define BUFLEN 256 +static void parse_env(const char *envstr) +{ + char envstrupper[BUFLEN]; + char buf[BUFLEN]; + + /* Convert env str to all uppercase */ + OPENSSL_strlcpy(envstrupper, envstr, sizeof(envstrupper)); + strtoupper(envstrupper); + + for (size_t i = 0; i < kRISCVNumCaps; ++i) { + /* Prefix capability with underscore in preparation for search */ + BIO_snprintf(buf, BUFLEN, "_%s", RISCV_capabilities[i].name); + if (strstr(envstrupper, buf) != NULL) { + /* Match, set relevant bit in OPENSSL_riscvcap_P[] */ + OPENSSL_riscvcap_P[RISCV_capabilities[i].index] |= + (1 << RISCV_capabilities[i].bit_offset); + } + } +} + +# if defined(__GNUC__) && __GNUC__>=2 +__attribute__ ((constructor)) +# endif +void OPENSSL_cpuid_setup(void) +{ + char *e; + static int trigger = 0; + + if (trigger != 0) + return; + trigger = 1; + + if ((e = getenv("OPENSSL_riscvcap"))) { + parse_env(e); + return; + } +} |