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1 | /* |
2 | * Copyright 2022 The OpenSSL Project Authors. All Rights Reserved. | |
3 | * | |
4 | * Licensed under the Apache License 2.0 (the "License"). You may not use | |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
8 | */ | |
9 | ||
10 | #include <stdlib.h> | |
11 | #include <string.h> | |
12 | #include <ctype.h> | |
13 | #include <stdint.h> | |
14 | #include <openssl/crypto.h> | |
15 | #include "internal/cryptlib.h" | |
16 | ||
17 | #define OPENSSL_RISCVCAP_IMPL | |
18 | #include "crypto/riscv_arch.h" | |
19 | ||
20 | static void parse_env(const char *envstr); | |
21 | static void strtoupper(char *str); | |
22 | ||
23 | uint32_t OPENSSL_rdtsc(void) | |
24 | { | |
25 | return 0; | |
26 | } | |
27 | ||
28 | size_t OPENSSL_instrument_bus(unsigned int *out, size_t cnt) | |
29 | { | |
30 | return 0; | |
31 | } | |
32 | ||
33 | size_t OPENSSL_instrument_bus2(unsigned int *out, size_t cnt, size_t max) | |
34 | { | |
35 | return 0; | |
36 | } | |
37 | ||
38 | static void strtoupper(char *str) | |
39 | { | |
40 | for (char *x = str; *x; ++x) | |
41 | *x = toupper(*x); | |
42 | } | |
43 | ||
44 | /* parse_env() parses a RISC-V architecture string. An example of such a string | |
45 | * is "rv64gc_zba_zbb_zbc_zbs". Currently, the rv64gc part is ignored | |
46 | * and we simply search for "_[extension]" in the arch string to see if we | |
47 | * should enable a given extension. | |
48 | */ | |
49 | #define BUFLEN 256 | |
50 | static void parse_env(const char *envstr) | |
51 | { | |
52 | char envstrupper[BUFLEN]; | |
53 | char buf[BUFLEN]; | |
54 | ||
55 | /* Convert env str to all uppercase */ | |
56 | OPENSSL_strlcpy(envstrupper, envstr, sizeof(envstrupper)); | |
57 | strtoupper(envstrupper); | |
58 | ||
59 | for (size_t i = 0; i < kRISCVNumCaps; ++i) { | |
60 | /* Prefix capability with underscore in preparation for search */ | |
61 | BIO_snprintf(buf, BUFLEN, "_%s", RISCV_capabilities[i].name); | |
62 | if (strstr(envstrupper, buf) != NULL) { | |
63 | /* Match, set relevant bit in OPENSSL_riscvcap_P[] */ | |
64 | OPENSSL_riscvcap_P[RISCV_capabilities[i].index] |= | |
65 | (1 << RISCV_capabilities[i].bit_offset); | |
66 | } | |
67 | } | |
68 | } | |
69 | ||
70 | # if defined(__GNUC__) && __GNUC__>=2 | |
71 | __attribute__ ((constructor)) | |
72 | # endif | |
73 | void OPENSSL_cpuid_setup(void) | |
74 | { | |
75 | char *e; | |
76 | static int trigger = 0; | |
77 | ||
78 | if (trigger != 0) | |
79 | return; | |
80 | trigger = 1; | |
81 | ||
82 | if ((e = getenv("OPENSSL_riscvcap"))) { | |
83 | parse_env(e); | |
84 | return; | |
85 | } | |
86 | } |