arch/x86_64/src/kernel/cpu/tr.cpp


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

#include "arch/kernel/cpu/tr.hpp"

namespace teachos::arch::kernel::cpu
{
  auto store_task_register() -> uint16_t
  {
    uint16_t current_value{};
    asm("str %[output]" : [output] "=r"(current_value));
    return current_value;
  }

  auto load_task_register(uint16_t gdt_offset) -> void
  {
    asm volatile("ltr %[input]" : /* no output from call */ : [input] "m"(gdt_offset));
  }
}  // namespace teachos::arch::kernel::cpu