diff options
Diffstat (limited to 'arch/x86_64/src/kernel/cpu/msr.cpp')
| -rw-r--r-- | arch/x86_64/src/kernel/cpu/msr.cpp | 31 |
1 files changed, 0 insertions, 31 deletions
diff --git a/arch/x86_64/src/kernel/cpu/msr.cpp b/arch/x86_64/src/kernel/cpu/msr.cpp deleted file mode 100644 index 9c474a1..0000000 --- a/arch/x86_64/src/kernel/cpu/msr.cpp +++ /dev/null @@ -1,31 +0,0 @@ -#include "arch/kernel/cpu/msr.hpp" - -namespace teachos::arch::kernel::cpu -{ - namespace - { - auto constexpr 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; - } - - auto write_msr(uint32_t msr, uint64_t value) -> void - { - uint32_t low = value; - uint32_t high = value >> 32; - asm volatile("wrmsr" - : /* no output from call */ - : "c"(msr), "a"(low), "d"(high)); - } - - auto set_efer_bit(efer_flags flag) -> void - { - auto const efer = read_msr(IA32_EFER_ADDRESS); - write_msr(IA32_EFER_ADDRESS, static_cast<std::underlying_type<efer_flags>::type>(flag) | efer); - } -} // namespace teachos::arch::kernel::cpu |
