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| author | Fabian Imhof <fabian.imhof@ost.ch> | 2025-03-13 09:36:00 +0000 |
|---|---|---|
| committer | Fabian Imhof <fabian.imhof@ost.ch> | 2025-03-13 09:36:00 +0000 |
| commit | b8a0024ee71a64ec0e87a1e2d0c0c7280dc954e6 (patch) | |
| tree | d4d8ee6a97074594c0c0e99a5d8706a4eadb178e /arch/x86_64/src/context_switching | |
| parent | 569cf73d1fa14ec11afbb37464d2c356d55d64b4 (diff) | |
| download | teachos-b8a0024ee71a64ec0e87a1e2d0c0c7280dc954e6.tar.xz teachos-b8a0024ee71a64ec0e87a1e2d0c0c7280dc954e6.zip | |
create GDT and fix segment descriptor bit order
Diffstat (limited to 'arch/x86_64/src/context_switching')
3 files changed, 22 insertions, 6 deletions
diff --git a/arch/x86_64/src/context_switching/descriptor_table/access_byte.cpp b/arch/x86_64/src/context_switching/descriptor_table/access_byte.cpp index 7a2b0b0..4e5459f 100644 --- a/arch/x86_64/src/context_switching/descriptor_table/access_byte.cpp +++ b/arch/x86_64/src/context_switching/descriptor_table/access_byte.cpp @@ -2,9 +2,9 @@ namespace teachos::arch::context_switching::descriptor_table { - access_byte::access_byte(uint8_t flags) + access_byte::access_byte(uint8_t flags, uint8_t type_field) : _flags(flags) - , _type(flags) + , _type(type_field) { // Nothing to do. } diff --git a/arch/x86_64/src/context_switching/descriptor_table/gdt_flags.cpp b/arch/x86_64/src/context_switching/descriptor_table/gdt_flags.cpp index 8fbf869..65f2e90 100644 --- a/arch/x86_64/src/context_switching/descriptor_table/gdt_flags.cpp +++ b/arch/x86_64/src/context_switching/descriptor_table/gdt_flags.cpp @@ -5,7 +5,7 @@ namespace teachos::arch::context_switching::descriptor_table { gdt_flags::gdt_flags(uint8_t flags) - : _flags(flags << 5U) + : _flags(flags) { // Nothing to do. } diff --git a/arch/x86_64/src/context_switching/descriptor_table/segment_descriptor.cpp b/arch/x86_64/src/context_switching/descriptor_table/segment_descriptor.cpp index 57564f2..ab8eaba 100644 --- a/arch/x86_64/src/context_switching/descriptor_table/segment_descriptor.cpp +++ b/arch/x86_64/src/context_switching/descriptor_table/segment_descriptor.cpp @@ -4,7 +4,7 @@ namespace teachos::arch::context_switching::descriptor_table { segment_descriptor::segment_descriptor(uint128_t flags) : _reserved(flags >> 96U) - , _access((flags >> 40U) << 80U) + , _access((flags >> 44U) << 80U, (flags >> 40U) << 84U) , _flag((flags >> 52U) << 72U) , _base(((flags >> 64U) << 32U) << 32U | ((flags >> 56U) << 64U) << 24U | (flags >> 16U) << 88U) , _limit(((flags >> 48U) << 72U) << 16U | flags << 112U) @@ -12,13 +12,29 @@ namespace teachos::arch::context_switching::descriptor_table // Nothing to do. } + segment_descriptor::segment_descriptor(access_byte access_byte, gdt_flags flags, uint64_t base, + std::bitset<20U> limit) + : _reserved(0U) + , _access(access_byte) + , _flag(flags) + , _base(base) + , _limit(limit) + { + // Nothing to do + } + auto segment_descriptor::get_segment_type() const -> segment_descriptor_type { if (!_access.contains_flags(access_byte::CODE_OR_DATA_SEGMENT)) { return segment_descriptor_type::SYSTEM_SEGMENT; } - return _access.get_type_field().contains_flags(type_field::CODE_SEGMENT) ? segment_descriptor_type::CODE_SEGMENT - : segment_descriptor_type::DATA_SEGMENT; + + if (_access.get_type_field().contains_flags(type_field::CODE_SEGMENT)) + { + return segment_descriptor_type::CODE_SEGMENT; + } + + return segment_descriptor_type::DATA_SEGMENT; } } // namespace teachos::arch::context_switching::descriptor_table |