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1 | /* Initialize CPU feature data. AArch64 version. |
---|---|
2 | This file is part of the GNU C Library. |
3 | Copyright (C) 2017-2019 Free Software Foundation, Inc. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <cpu-features.h> |
20 | #include <sys/auxv.h> |
21 | #include <elf/dl-hwcaps.h> |
22 | |
23 | #define DCZID_DZP_MASK (1 << 4) |
24 | #define DCZID_BS_MASK (0xf) |
25 | |
26 | #if HAVE_TUNABLES |
27 | struct cpu_list |
28 | { |
29 | const char *name; |
30 | uint64_t midr; |
31 | }; |
32 | |
33 | static struct cpu_list cpu_list[] = { |
34 | {"falkor", 0x510FC000}, |
35 | {"thunderxt88", 0x430F0A10}, |
36 | {"thunderx2t99", 0x431F0AF0}, |
37 | {"thunderx2t99p1", 0x420F5160}, |
38 | {"phecda", 0x680F0000}, |
39 | {"ares", 0x411FD0C0}, |
40 | {"emag", 0x503F0001}, |
41 | {"generic", 0x0} |
42 | }; |
43 | |
44 | static uint64_t |
45 | get_midr_from_mcpu (const char *mcpu) |
46 | { |
47 | for (int i = 0; i < sizeof (cpu_list) / sizeof (struct cpu_list); i++) |
48 | if (strcmp (mcpu, cpu_list[i].name) == 0) |
49 | return cpu_list[i].midr; |
50 | |
51 | return UINT64_MAX; |
52 | } |
53 | #endif |
54 | |
55 | static inline void |
56 | init_cpu_features (struct cpu_features *cpu_features) |
57 | { |
58 | register uint64_t midr = UINT64_MAX; |
59 | |
60 | #if HAVE_TUNABLES |
61 | /* Get the tunable override. */ |
62 | const char *mcpu = TUNABLE_GET (glibc, cpu, name, const char *, NULL); |
63 | if (mcpu != NULL) |
64 | midr = get_midr_from_mcpu (mcpu); |
65 | #endif |
66 | |
67 | /* If there was no useful tunable override, query the MIDR if the kernel |
68 | allows it. */ |
69 | if (midr == UINT64_MAX) |
70 | { |
71 | if (GLRO (dl_hwcap) & HWCAP_CPUID) |
72 | asm volatile ("mrs %0, midr_el1": "=r"(midr)); |
73 | else |
74 | midr = 0; |
75 | } |
76 | |
77 | cpu_features->midr_el1 = midr; |
78 | |
79 | /* Check if ZVA is enabled. */ |
80 | unsigned dczid; |
81 | asm volatile ("mrs %0, dczid_el0": "=r"(dczid)); |
82 | |
83 | if ((dczid & DCZID_DZP_MASK) == 0) |
84 | cpu_features->zva_size = 4 << (dczid & DCZID_BS_MASK); |
85 | } |
86 |
Warning: That file was not part of the compilation database. It may have many parsing errors.