diff options
Diffstat (limited to 'arch/x86_64/src/memory/cpu/msr.cpp')
| -rw-r--r-- | arch/x86_64/src/memory/cpu/msr.cpp | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/arch/x86_64/src/memory/cpu/msr.cpp b/arch/x86_64/src/memory/cpu/msr.cpp index 3a917c9..6e3d1d3 100644 --- a/arch/x86_64/src/memory/cpu/msr.cpp +++ b/arch/x86_64/src/memory/cpu/msr.cpp @@ -2,14 +2,19 @@ namespace teachos::arch::memory::cpu { - uint64_t read_msr(uint32_t msr) + namespace + { + constexpr uint32_t IA32_EFER_ADDRESS = 0xC0000080; + } + + auto read_msr(uint32_t msr) -> uint64_t { uint32_t low, high; asm volatile("rdmsr" : "=a"(low), "=d"(high) : "c"(msr)); return (static_cast<uint64_t>(high) << 32) | low; } - void write_msr(uint32_t msr, uint64_t value) + auto write_msr(uint32_t msr, uint64_t value) -> void { uint32_t low = value & 0xFFFFFFFF; uint32_t high = value >> 32; @@ -18,12 +23,11 @@ namespace teachos::arch::memory::cpu : "c"(msr), "a"(low), "d"(high)); } - void set_msr_bit(msr_flags flag) + auto set_efer_bit(efer_flags flag) -> void { - uint64_t efer = read_msr(IA32_EFER); - write_msr(IA32_EFER, static_cast<uint64_t>(flag) | efer); + uint64_t const efer = read_msr(IA32_EFER_ADDRESS); + write_msr(IA32_EFER_ADDRESS, static_cast<uint64_t>(flag) | efer); } - void enable_nxe_bit() { set_msr_bit(msr_flags::NXE); } - + auto enable_nxe_bit() -> void { set_efer_bit(efer_flags::NXE); } } // namespace teachos::arch::memory::cpu |