1 /* Linux/ARM version of processor capability information handling macros. 2 Copyright (C) 2001-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 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 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _DL_PROCINFO_H 20 #define _DL_PROCINFO_H 1 21 22 #include <ldsodefs.h> 23 #include <sysdep.h> 24 25 #define _DL_HWCAP_COUNT 27 26 27 /* Low 22 bits are allocated in HWCAP. */ 28 #define _DL_HWCAP_LAST 21 29 30 /* Low 5 bits are allocated in HWCAP2. */ 31 #define _DL_HWCAP2_LAST 4 32 33 /* The kernel provides platform data but it is not interesting. */ 34 #define _DL_HWCAP_PLATFORM 0 35 36 37 static inline const char * 38 __attribute__ ((unused)) _dl_hwcap_string(int idx)39_dl_hwcap_string (int idx) 40 { 41 return GLRO(dl_arm_cap_flags)[idx]; 42 }; 43 44 static inline int 45 __attribute__ ((unused)) _dl_procinfo(unsigned int type,unsigned long int word)46_dl_procinfo (unsigned int type, unsigned long int word) 47 { 48 switch(type) 49 { 50 case AT_HWCAP: 51 _dl_printf ("AT_HWCAP: "); 52 53 for (int i = 0; i <= _DL_HWCAP_LAST; ++i) 54 if (word & (1 << i)) 55 _dl_printf (" %s", _dl_hwcap_string (i)); 56 break; 57 case AT_HWCAP2: 58 { 59 unsigned int offset = _DL_HWCAP_LAST + 1; 60 61 _dl_printf ("AT_HWCAP2: "); 62 63 for (int i = 0; i <= _DL_HWCAP2_LAST; ++i) 64 if (word & (1 << i)) 65 _dl_printf (" %s", _dl_hwcap_string (offset + i)); 66 break; 67 } 68 default: 69 /* Fallback to generic output mechanism. */ 70 return -1; 71 } 72 _dl_printf ("\n"); 73 return 0; 74 } 75 76 #define HWCAP_IMPORTANT (HWCAP_ARM_VFP | HWCAP_ARM_NEON) 77 78 static inline int 79 __attribute__ ((unused)) _dl_string_hwcap(const char * str)80_dl_string_hwcap (const char *str) 81 { 82 for (int i = 0; i < _DL_HWCAP_COUNT; i++) 83 { 84 if (strcmp (str, _dl_hwcap_string (i)) == 0) 85 return i; 86 } 87 return -1; 88 }; 89 90 #define _dl_string_platform(str) (-1) 91 92 #endif /* dl-procinfo.h */ 93