1 /*
2 * @file architecture specific interfaces
3 * @remark Copyright 2008 Intel Corporation
4 * @remark Read the file COPYING
5 * @author Andi Kleen
6 */
7
8 #if defined(__i386__) || defined(__x86_64__)
9
10 /* Assume we run on the same host as the profilee */
11
12 #define num_to_mask(x) ((1U << (x)) - 1)
13
cpuid_vendor(char * vnd)14 static inline int cpuid_vendor(char *vnd)
15 {
16 union {
17 struct {
18 unsigned b,d,c;
19 };
20 char v[12];
21 } v;
22 unsigned eax;
23 asm("cpuid" : "=a" (eax), "=b" (v.b), "=c" (v.c), "=d" (v.d) : "0" (0));
24 return !strncmp(v.v, vnd, 12);
25 }
26
27 /* Work around Nehalem spec update AAJ79: CPUID incorrectly indicates
28 unhalted reference cycle architectural event is supported. We assume
29 steppings after C0 report correct data in CPUID. */
workaround_nehalem_aaj79(unsigned * ebx)30 static inline void workaround_nehalem_aaj79(unsigned *ebx)
31 {
32 union {
33 unsigned eax;
34 struct {
35 unsigned stepping : 4;
36 unsigned model : 4;
37 unsigned family : 4;
38 unsigned type : 2;
39 unsigned res : 2;
40 unsigned ext_model : 4;
41 unsigned ext_family : 8;
42 unsigned res2 : 4;
43 };
44 } v;
45 unsigned model;
46
47 if (!cpuid_vendor("GenuineIntel"))
48 return;
49 asm("cpuid" : "=a" (v.eax) : "0" (1) : "ecx","ebx","edx");
50 model = (v.ext_model << 4) + v.model;
51 if (v.family != 6 || model != 26 || v.stepping > 4)
52 return;
53 *ebx |= (1 << 2); /* disable unsupported event */
54 }
55
arch_get_filter(op_cpu cpu_type)56 static inline unsigned arch_get_filter(op_cpu cpu_type)
57 {
58 if (cpu_type == CPU_ARCH_PERFMON) {
59 unsigned ebx, eax;
60 asm("cpuid" : "=a" (eax), "=b" (ebx) : "0" (0xa) : "ecx","edx");
61 workaround_nehalem_aaj79(&ebx);
62 return ebx & num_to_mask(eax >> 24);
63 }
64 return -1U;
65 }
66
arch_num_counters(op_cpu cpu_type)67 static inline int arch_num_counters(op_cpu cpu_type)
68 {
69 if (cpu_type == CPU_ARCH_PERFMON) {
70 unsigned v;
71 asm("cpuid" : "=a" (v) : "0" (0xa) : "ebx","ecx","edx");
72 return (v >> 8) & 0xff;
73 }
74 return -1;
75 }
76
arch_get_counter_mask(void)77 static inline unsigned arch_get_counter_mask(void)
78 {
79 unsigned v;
80 asm("cpuid" : "=a" (v) : "0" (0xa) : "ebx","ecx","edx");
81 return num_to_mask((v >> 8) & 0xff);
82 }
83
84 #else
85
arch_get_filter(op_cpu cpu_type)86 static inline unsigned arch_get_filter(op_cpu cpu_type)
87 {
88 /* Do something with passed arg to shut up the compiler warning */
89 if (cpu_type != CPU_NO_GOOD)
90 return 0;
91 return 0;
92 }
93
arch_num_counters(op_cpu cpu_type)94 static inline int arch_num_counters(op_cpu cpu_type)
95 {
96 /* Do something with passed arg to shut up the compiler warning */
97 if (cpu_type != CPU_NO_GOOD)
98 return -1;
99 return -1;
100 }
101
arch_get_counter_mask(void)102 static inline unsigned arch_get_counter_mask(void)
103 {
104 return 0;
105 }
106
107 #endif
108