diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/i386/sysconf.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/sysconf.c | 63 |
1 files changed, 56 insertions, 7 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/sysconf.c b/sysdeps/unix/sysv/linux/i386/sysconf.c index ff3cf9f7c7..4ea1a2bf58 100644 --- a/sysdeps/unix/sysv/linux/i386/sysconf.c +++ b/sysdeps/unix/sysv/linux/i386/sysconf.c @@ -1,5 +1,5 @@ /* Get file-specific information about a file. Linux version. - Copyright (C) 2003, 2004, 2006, 2007, 2009 Free Software Foundation, Inc. + Copyright (C) 2003, 2004, 2006, 2007, 2009, 2011 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -186,6 +186,55 @@ intel_check_word (int name, unsigned int value, bool *has_level_2, /* No need to look further. */ break; } + else if (byte == 0xff) + { + /* CPUID leaf 0x4 contains all the information. We need to + iterate over it. */ + unsigned int eax; + unsigned int ebx; + unsigned int ecx; + unsigned int edx; + + unsigned int round = 0; + while (1) + { + asm volatile ("xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1" + : "=a" (eax), "=r" (ebx), "=c" (ecx), "=d" (edx) + : "0" (4), "2" (round)); + + enum { null = 0, data = 1, inst = 2, uni = 3 } type = eax & 0x1f; + if (type == null) + /* That was the end. */ + break; + + unsigned int level = (eax >> 5) & 0x7; + + if ((level == 1 && type == data + && folded_rel_name == M(_SC_LEVEL1_DCACHE_SIZE)) + || (level == 1 && type == inst + && folded_rel_name == M(_SC_LEVEL1_ICACHE_SIZE)) + || (level == 2 && folded_rel_name == M(_SC_LEVEL2_CACHE_SIZE)) + || (level == 3 && folded_rel_name == M(_SC_LEVEL3_CACHE_SIZE)) + || (level == 4 && folded_rel_name == M(_SC_LEVEL4_CACHE_SIZE))) + { + unsigned int offset = M(name) - folded_rel_name; + + if (offset == 0) + /* Cache size. */ + return (((ebx >> 22) + 1) + * (((ebx >> 12) & 0x3ff) + 1) + * ((ebx & 0xfff) + 1) + * (ecx + 1)); + if (offset == 1) + return (ebx >> 22) + 1; + + assert (offset == 2); + return (ebx & 0xfff) + 1; + } + } + /* There is no other cache information anywhere else. */ + break; + } else { if (byte == 0x49 && folded_rel_name == M(_SC_LEVEL3_CACHE_SIZE)) @@ -358,11 +407,11 @@ handle_amd (int name) case _SC_LEVEL2_CACHE_ASSOC: ecx >>= 12; switch (ecx & 0xf) - { - case 0: - case 1: - case 2: - case 4: + { + case 0: + case 1: + case 2: + case 4: return ecx & 0xf; case 6: return 8; @@ -372,7 +421,7 @@ handle_amd (int name) return (ecx << 6) & 0x3fffc00; default: return 0; - } + } case _SC_LEVEL2_CACHE_LINESIZE: return (ecx & 0xf000) == 0 ? 0 : ecx & 0xff; default: |