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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
27struct cpu_list
28{
29 const char *name;
30 uint64_t midr;
31};
32
33static 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
44static uint64_t
45get_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
55static inline void
56init_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

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