diff options
Diffstat (limited to 'arch/x86_64/src/kernel')
| -rw-r--r-- | arch/x86_64/src/kernel/main.cpp | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/x86_64/src/kernel/main.cpp b/arch/x86_64/src/kernel/main.cpp index 472aed5..d3938ed 100644 --- a/arch/x86_64/src/kernel/main.cpp +++ b/arch/x86_64/src/kernel/main.cpp @@ -1,9 +1,11 @@ #include "arch/kernel/main.hpp" +#include "arch/context_switching/descriptor_table/segment_descriptor.hpp" #include "arch/memory/heap/bump_allocator.hpp" #include "arch/memory/heap/global_heap_allocator.hpp" #include "arch/memory/main.hpp" #include "arch/memory/multiboot/reader.hpp" +#include "arch/stl/vector.hpp" #include "arch/video/vga/text.hpp" namespace teachos::arch::kernel @@ -57,5 +59,53 @@ namespace teachos::arch::kernel memory::heap::global_heap_allocator::register_heap_allocator(memory::heap::heap_allocator_type::LINKED_LIST); heap_test(); + + using context_switching::descriptor_table::access_byte; + using context_switching::descriptor_table::gdt_flags; + using context_switching::descriptor_table::segment_descriptor; + using context_switching::descriptor_table::segment_descriptor_type; + using context_switching::descriptor_table::type_field; + + segment_descriptor null_segment{0}; + + // Kernel space code segment + access_byte kernel_code_access_byte{access_byte::PRESENT | access_byte::ACCESS_LEVEL_KERNEL | + access_byte::CODE_OR_DATA_SEGMENT, + type_field::CODE_SEGMENT | type_field::READABLE}; + gdt_flags kernel_code_gdt_flags{gdt_flags::GRANULARITY | gdt_flags::LENGTH}; + segment_descriptor kernel_code_segment{kernel_code_access_byte, kernel_code_gdt_flags, 0, 0xFFFFF}; + + // Kernel space data segment + access_byte kernel_data_access_byte{access_byte::PRESENT | access_byte::ACCESS_LEVEL_KERNEL | + access_byte::CODE_OR_DATA_SEGMENT, + type_field::WRITABLE}; + gdt_flags kernel_data_gdt_flags{gdt_flags::GRANULARITY | gdt_flags::UPPER_BOUND}; + segment_descriptor kernel_data_segment{kernel_data_access_byte, kernel_data_gdt_flags, 0, 0xFFFFF}; + + // User space code segment + access_byte user_code_access_byte{access_byte::PRESENT | access_byte::ACCESS_LEVEL_USER | + access_byte::CODE_OR_DATA_SEGMENT, + type_field::CODE_SEGMENT | type_field::READABLE}; + gdt_flags user_code_gdt_flags{gdt_flags::GRANULARITY | gdt_flags::LENGTH}; + segment_descriptor user_code_segment{user_code_access_byte, user_code_gdt_flags, 0, 0xFFFFF}; + + // User space data segment + access_byte user_data_access_byte{access_byte::PRESENT | access_byte::ACCESS_LEVEL_USER | + access_byte::CODE_OR_DATA_SEGMENT, + type_field::WRITABLE}; + gdt_flags user_data_gdt_flags{gdt_flags::GRANULARITY | gdt_flags::UPPER_BOUND}; + segment_descriptor user_data_segment{user_data_access_byte, user_data_gdt_flags, 0, 0xFFFFF}; + + stl::vector<segment_descriptor> global_descriptor_table{null_segment, kernel_code_segment, kernel_data_segment, + user_code_segment, user_data_segment}; + + decltype(auto) x = global_descriptor_table.at(1); + if (global_descriptor_table.size() == 0) + { + } + if (x.get_segment_type() == segment_descriptor_type::CODE_SEGMENT) + { + } + video::vga::text::write("GDT FILLED", video::vga::text::common_attributes::green_on_black); } } // namespace teachos::arch::kernel |