From 36758071881088b27a52cee4e5653f6cf6a79a78 Mon Sep 17 00:00:00 2001 From: Fabian Imhof Date: Sun, 16 Mar 2025 12:41:09 +0000 Subject: start implementing TSS --- arch/x86_64/src/kernel/cpu/gdtr.cpp | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 arch/x86_64/src/kernel/cpu/gdtr.cpp (limited to 'arch/x86_64/src/kernel/cpu/gdtr.cpp') diff --git a/arch/x86_64/src/kernel/cpu/gdtr.cpp b/arch/x86_64/src/kernel/cpu/gdtr.cpp new file mode 100644 index 0000000..2fe3a99 --- /dev/null +++ b/arch/x86_64/src/kernel/cpu/gdtr.cpp @@ -0,0 +1,20 @@ +#include "arch/kernel/cpu/gdtr.hpp" + +#include "arch/context_switching/descriptor_table/global_descriptor_table_pointer.hpp" + +namespace teachos::arch::kernel::cpu +{ + auto store_global_descriptor_table() -> context_switching::descriptor_table::global_descriptor_table_pointer + { + context_switching::descriptor_table::global_descriptor_table_pointer current_value{}; + asm("sgdt %[output]" : [output] "=m"(current_value)); + return current_value; + } + + auto + load_global_descriptor_table(context_switching::descriptor_table::global_descriptor_table_pointer const & gdt_pointer) + -> void + { + asm volatile("lgdt %[input]" : /* no output from call */ : [input] "m"(gdt_pointer)); + } +} // namespace teachos::arch::kernel::cpu -- cgit v1.2.3