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turbostat: Use GCC's CPUID functions to support PIC 

commit 2b92865e64 upstream.

turbostat uses inline assembly to call cpuid.  On 32-bit x86, on systems
that have certain security features enabled by default that make -fPIC
the default, this causes a build error:

turbostat.c: In function ‘check_cpuid’:
turbostat.c:1906:2: error: PIC register clobbered by ‘ebx’ in ‘asm’
  asm("cpuid" : "=a" (fms), "=c" (ecx), "=d" (edx) : "a" (1) : "ebx");
  ^

GCC provides a header cpuid.h, containing a __get_cpuid function that
works with both PIC and non-PIC.  (On PIC, it saves and restores ebx
around the cpuid instruction.)  Use that instead.

Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Josh Triplett 2013-08-20 17:20:14 -07:00 committed by Greg Kroah-Hartman
parent b06c0a0cc5
commit 4c6544f603
1 changed files with 6 additions and 5 deletions
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11
tools/power/x86/turbostat/turbostat.c
View File

@ -34,6 +34,7 @@
#include <string.h>
#include <ctype.h>
#include <sched.h>
#include <cpuid.h>
#define MSR_TSC 0x10
#define MSR_NEHALEM_PLATFORM_INFO 0xCE
@ -932,7 +933,7 @@ void check_cpuid()
eax = ebx = ecx = edx = 0;
asm("cpuid" : "=a" (max_level), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0));
__get_cpuid(0, &max_level, &ebx, &ecx, &edx);
if (ebx == 0x756e6547 && edx == 0x49656e69 && ecx == 0x6c65746e)
genuine_intel = 1;
@ -941,7 +942,7 @@ void check_cpuid()
fprintf(stderr, "%.4s%.4s%.4s ",
(char *)&ebx, (char *)&edx, (char *)&ecx);
asm("cpuid" : "=a" (fms), "=c" (ecx), "=d" (edx) : "a" (1) : "ebx");
__get_cpuid(1, &fms, &ebx, &ecx, &edx);
family = (fms >> 8) & 0xf;
model = (fms >> 4) & 0xf;
stepping = fms & 0xf;
@ -963,7 +964,7 @@ void check_cpuid()
* This check is valid for both Intel and AMD.
*/
ebx = ecx = edx = 0;
asm("cpuid" : "=a" (max_level), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0x80000000));
__get_cpuid(0x80000000, &max_level, &ebx, &ecx, &edx);
if (max_level < 0x80000007) {
fprintf(stderr, "CPUID: no invariant TSC (max_level 0x%x)\n", max_level);
@ -974,7 +975,7 @@ void check_cpuid()
* Non-Stop TSC is advertised by CPUID.EAX=0x80000007: EDX.bit8
* this check is valid for both Intel and AMD
*/
asm("cpuid" : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0x80000007));
__get_cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
has_invariant_tsc = edx & (1 << 8);
if (!has_invariant_tsc) {
@ -987,7 +988,7 @@ void check_cpuid()
* this check is valid for both Intel and AMD
*/
asm("cpuid" : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0x6));
__get_cpuid(0x6, &eax, &ebx, &ecx, &edx);
has_aperf = ecx & (1 << 0);
if (!has_aperf) {
fprintf(stderr, "No APERF MSR\n");