diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/x86_64/sysconf.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/sysconf.c | 78 |
1 files changed, 76 insertions, 2 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/sysconf.c b/sysdeps/unix/sysv/linux/x86_64/sysconf.c index ab777ba0cd..87f2c451f3 100644 --- a/sysdeps/unix/sysv/linux/x86_64/sysconf.c +++ b/sysdeps/unix/sysv/linux/x86_64/sysconf.c @@ -26,7 +26,7 @@ static long int linux_sysconf (int name); -static struct intel_02_cache_info +static const struct intel_02_cache_info { unsigned int idx; int name; @@ -206,12 +206,81 @@ handle_intel (int name, unsigned int maxidx) } +static long int +handle_amd (int name) +{ + unsigned int eax; + unsigned int ebx; + unsigned int ecx; + unsigned int edx; + asm volatile ("xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1" + : "=a" (eax), "=r" (ebx), "=c" (ecx), "=d" (edx) + : "0" (0x80000000)); + + if (name >= _SC_LEVEL3_CACHE_SIZE) + return 0; + + unsigned int fn = 0x80000005 + (name >= _SC_LEVEL2_CACHE_SIZE); + if (eax < fn) + return 0; + + asm volatile ("xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1" + : "=a" (eax), "=r" (ebx), "=c" (ecx), "=d" (edx) + : "0" (fn)); + + if (name < _SC_LEVEL1_DCACHE_SIZE) + { + name += _SC_LEVEL1_DCACHE_SIZE - _SC_LEVEL1_ICACHE_SIZE; + ecx = edx; + } + + switch (name) + { + case _SC_LEVEL1_DCACHE_SIZE: + return (ecx >> 14) & 0x3fc00; + case _SC_LEVEL1_DCACHE_ASSOC: + ecx >>= 16; + if ((ecx & 0xff) == 0xff) + /* Fully associative. */ + return (ecx << 2) & 0x3fc00; + return ecx & 0xff; + case _SC_LEVEL1_DCACHE_LINESIZE: + return ecx & 0xff; + case _SC_LEVEL2_CACHE_SIZE: + return (ecx & 0xf000) == 0 ? 0 : (ecx >> 6) & 0x3fffc00; + case _SC_LEVEL2_CACHE_ASSOC: + ecx >>= 12; + switch (ecx & 0xf) + { + case 0: + case 1: + case 2: + case 4: + return ecx & 0xf; + case 6: + return 8; + case 8: + return 16; + case 0xf: + return (ecx << 6) & 0x3fffc00; + default: + return 0; + } + case _SC_LEVEL2_CACHE_LINESIZE: + return (ecx & 0xf000) == 0 ? 0 : ecx & 0xff; + default: + assert (! "cannot happen"); + } + return -1; +} + + /* Get the value of the system variable NAME. */ long int __sysconf (int name) { /* We only handle the cache information here (for now). */ - if (name < _SC_LEVEL1_ICACHE_SIZE || name > _SC_LEVEL4_CACHE_ASSOC) + if (name < _SC_LEVEL1_ICACHE_SIZE || name > _SC_LEVEL4_CACHE_LINESIZE) return linux_sysconf (name); /* Find out what brand of processor. */ @@ -226,6 +295,11 @@ __sysconf (int name) /* This spells out "GenuineIntel". */ if (ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69) return handle_intel (name, eax); + + /* This spells out "AuthenticAMD". */ + if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65) + return handle_amd (name); + // XXX Fill in more vendors. /* CPU not known, we have no information. */ |