read msr (IA32_ENERGY_PERF_BIAS )

hi

I want to read msr register (IA32_ENERGY_PERF_BIAS(1B0H) ) in assembly with "rdmsr" instruction but have a run time error (Segmentation fault (core dumped)).

I execute my code by root.

-------------------- it's my code -----------------

    .section    .rodata

.LC0:

    .string    "result %u\n"

    .text

    .globl    main

    .type    main, @function

main:

.LFB0:

    .cfi_startproc

    pushq    %rbp

    .cfi_def_cfa_offset 16

    .cfi_offset 6, -16

    movq    %rsp, %rbp

    movq    $0,%rax

    movq    $0,%rdx

    movl    $0x1b0,%ecx

    rdmsr

    .cfi_def_cfa_register 6

    subq    $16, %rsp

    movl    %ecx, -4(%rbp)

    movl    $.LC0, %eax

    movl    -4(%rbp), %edx

    movl    %edx, %esi

    movq    %rax, %rdi

    movl    $0, %eax

    call    printf

    movl    $0, %eax

    leave

    .cfi_def_cfa 7, 8

    ret

    .cfi_endproc

.LFE0:

    .size    main, .-main

    .ident    "GCC: (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3"

    .section    .note.GNU-stack,"",@progbits