1*bc2373a5SKan Liang /* SPDX-License-Identifier: GPL-2.0 */
2*bc2373a5SKan Liang #ifndef PERF_CPUID_H
3*bc2373a5SKan Liang #define PERF_CPUID_H 1
4*bc2373a5SKan Liang
5*bc2373a5SKan Liang
6*bc2373a5SKan Liang static inline void
cpuid(unsigned int op,unsigned int op2,unsigned int * a,unsigned int * b,unsigned int * c,unsigned int * d)7*bc2373a5SKan Liang cpuid(unsigned int op, unsigned int op2, unsigned int *a, unsigned int *b,
8*bc2373a5SKan Liang unsigned int *c, unsigned int *d)
9*bc2373a5SKan Liang {
10*bc2373a5SKan Liang /*
11*bc2373a5SKan Liang * Preserve %ebx/%rbx register by either placing it in %rdi or saving it
12*bc2373a5SKan Liang * on the stack - x86-64 needs to avoid the stack red zone. In PIC
13*bc2373a5SKan Liang * compilations %ebx contains the address of the global offset
14*bc2373a5SKan Liang * table. %rbx is occasionally used to address stack variables in
15*bc2373a5SKan Liang * presence of dynamic allocas.
16*bc2373a5SKan Liang */
17*bc2373a5SKan Liang asm(
18*bc2373a5SKan Liang #if defined(__x86_64__)
19*bc2373a5SKan Liang "mov %%rbx, %%rdi\n"
20*bc2373a5SKan Liang "cpuid\n"
21*bc2373a5SKan Liang "xchg %%rdi, %%rbx\n"
22*bc2373a5SKan Liang #else
23*bc2373a5SKan Liang "pushl %%ebx\n"
24*bc2373a5SKan Liang "cpuid\n"
25*bc2373a5SKan Liang "movl %%ebx, %%edi\n"
26*bc2373a5SKan Liang "popl %%ebx\n"
27*bc2373a5SKan Liang #endif
28*bc2373a5SKan Liang : "=a"(*a), "=D"(*b), "=c"(*c), "=d"(*d)
29*bc2373a5SKan Liang : "a"(op), "2"(op2));
30*bc2373a5SKan Liang }
31*bc2373a5SKan Liang
32*bc2373a5SKan Liang void get_cpuid_0(char *vendor, unsigned int *lvl);
33*bc2373a5SKan Liang
34*bc2373a5SKan Liang #endif
35