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.text
.set IA32_EFER, 0xc0000080
.set STAR_MSR, 0xc0000081
.set LSTAR_MSR, 0xc0000082
.global init_userspace
init_userspace:
push %rbp
mov %rsp, %rbp
mov $LSTAR_MSR, %rcx
movabs $__syscall, %rax
shr $32, %rax
mov %eax, %edx
movabs $__syscall, %rax
wrmsr
mov $IA32_EFER, %rcx
rdmsr
or $1, %eax
wrmsr
mov $STAR_MSR, %rcx
rdmsr
mov $0x00130008, %edx
wrmsr
mov %rbp, %rsp
pop %rbp
ret
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