diff options
Diffstat (limited to 'arch/x86_64/src/context_switching')
13 files changed, 86 insertions, 88 deletions
diff --git a/arch/x86_64/src/context_switching/descriptor_table/gate_descriptor.cpp b/arch/x86_64/src/context_switching/descriptor_table/gate_descriptor.cpp deleted file mode 100644 index ee91e53..0000000 --- a/arch/x86_64/src/context_switching/descriptor_table/gate_descriptor.cpp +++ /dev/null @@ -1,5 +0,0 @@ -#include "arch/context_switching/descriptor_table/gate_descriptor.hpp" - -namespace teachos::arch::context_switching::descriptor_table -{ -} // namespace teachos::arch::context_switching::descriptor_table 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 deleted file mode 100644 index 9e95182..0000000 --- a/arch/x86_64/src/context_switching/descriptor_table/gdt_flags.cpp +++ /dev/null @@ -1,18 +0,0 @@ -#include "arch/context_switching/descriptor_table/gdt_flags.hpp" - -namespace teachos::arch::context_switching::descriptor_table -{ - gdt_flags::gdt_flags(uint8_t flags, std::bitset<20U> limit) - : _limit_2(limit.to_ulong() >> 16U) - , _flags(flags) - { - // Nothing to do. - } - - auto gdt_flags::contains_flags(std::bitset<4U> other) const -> bool - { - return (std::bitset<4U>{_flags} & other) == other; - } - - auto descriptor_table::gdt_flags::get_limit() const -> std::bitset<4U> { return std::bitset<4U>{_limit_2}; } -} // namespace teachos::arch::context_switching::descriptor_table diff --git a/arch/x86_64/src/context_switching/descriptor_table/initialization.cpp b/arch/x86_64/src/context_switching/descriptor_table/initialization.cpp deleted file mode 100644 index 4d8b3e3..0000000 --- a/arch/x86_64/src/context_switching/descriptor_table/initialization.cpp +++ /dev/null @@ -1,38 +0,0 @@ -#include "arch/context_switching/descriptor_table/initialization.hpp" - -#include "arch/boot/pointers.hpp" -#include "arch/exception_handling/assert.hpp" -#include "arch/kernel/cpu/if.hpp" -#include "arch/kernel/cpu/jmp.hpp" -#include "arch/kernel/cpu/tr.hpp" - -namespace teachos::arch::context_switching::descriptor_table -{ - auto initialize_descriptor_tables() -> descriptor_tables - { - decltype(auto) global_descriptor_table = context_switching::descriptor_table::initialize_global_descriptor_table(); - - // TODO: Replace random construction with return value of initialization. - interrupt_descriptor_table idt{}; - context_switching::descriptor_table::initialize_interrupt_descriptor_table(); - - kernel::cpu::jmp((uint64_t)&global_descriptor_table.at(1), boot::segment_register_reload_pointer); - - uint16_t const tss_selector = (global_descriptor_table.size() - 1) << 3; - kernel::cpu::load_task_register(tss_selector); - - // Not sure if offset index or offset in bytes is needed! - // uint16_t const tss_selector = (gdt.size() - 1) * sizeof(segment_descriptor); - // kernel::cpu::load_task_register(tss_selector); - - auto const stored_task_register = kernel::cpu::store_task_register(); - arch::exception_handling::assert(tss_selector == stored_task_register, - "[Global Descriptor Table] Loaded TR value is not the same as the stored value."); - - kernel::cpu::set_interrupt_flag(); - - descriptor_tables descriptor_tables = {global_descriptor_table, idt}; - return descriptor_tables; - } - -} // namespace teachos::arch::context_switching::descriptor_table
\ No newline at end of file diff --git a/arch/x86_64/src/context_switching/descriptor_table/interrupt_descriptor_table.cpp b/arch/x86_64/src/context_switching/descriptor_table/interrupt_descriptor_table.cpp deleted file mode 100644 index 9878664..0000000 --- a/arch/x86_64/src/context_switching/descriptor_table/interrupt_descriptor_table.cpp +++ /dev/null @@ -1,10 +0,0 @@ -#include "arch/context_switching/descriptor_table/interrupt_descriptor_table.hpp" - -namespace teachos::arch::context_switching::descriptor_table -{ - auto initialize_interrupt_descriptor_table() -> void - { - // DO NOT - } - -} // namespace teachos::arch::context_switching::descriptor_table diff --git a/arch/x86_64/src/context_switching/interrupt_descriptor_table/gate_descriptor.cpp b/arch/x86_64/src/context_switching/interrupt_descriptor_table/gate_descriptor.cpp new file mode 100644 index 0000000..4f18197 --- /dev/null +++ b/arch/x86_64/src/context_switching/interrupt_descriptor_table/gate_descriptor.cpp @@ -0,0 +1,5 @@ +#include "arch/context_switching/interrupt_descriptor_table/gate_descriptor.hpp" + +namespace teachos::arch::context_switching::interrupt_descriptor_table +{ +} // namespace teachos::arch::context_switching::interrupt_descriptor_table diff --git a/arch/x86_64/src/context_switching/interrupt_descriptor_table/interrupt_descriptor_table.cpp b/arch/x86_64/src/context_switching/interrupt_descriptor_table/interrupt_descriptor_table.cpp new file mode 100644 index 0000000..619a695 --- /dev/null +++ b/arch/x86_64/src/context_switching/interrupt_descriptor_table/interrupt_descriptor_table.cpp @@ -0,0 +1,10 @@ +#include "arch/context_switching/interrupt_descriptor_table/interrupt_descriptor_table.hpp" + +namespace teachos::arch::context_switching::interrupt_descriptor_table +{ + auto initialize_interrupt_descriptor_table() -> void + { + // DO NOT + } + +} // namespace teachos::arch::context_switching::interrupt_descriptor_table diff --git a/arch/x86_64/src/context_switching/descriptor_table/interrupt_descriptor_table_pointer.cpp b/arch/x86_64/src/context_switching/interrupt_descriptor_table/interrupt_descriptor_table_pointer.cpp index b45324d..981944d 100644 --- a/arch/x86_64/src/context_switching/descriptor_table/interrupt_descriptor_table_pointer.cpp +++ b/arch/x86_64/src/context_switching/interrupt_descriptor_table/interrupt_descriptor_table_pointer.cpp @@ -1,6 +1,6 @@ -#include "arch/context_switching/descriptor_table/interrupt_descriptor_table_pointer.hpp" +#include "arch/context_switching/interrupt_descriptor_table/interrupt_descriptor_table_pointer.hpp" -namespace teachos::arch::context_switching::descriptor_table +namespace teachos::arch::context_switching::interrupt_descriptor_table { interrupt_descriptor_table_pointer::interrupt_descriptor_table_pointer(uint16_t table_length, interrupt_descriptor_table * address) @@ -10,4 +10,4 @@ namespace teachos::arch::context_switching::descriptor_table // Nothing to do. } -} // namespace teachos::arch::context_switching::descriptor_table +} // namespace teachos::arch::context_switching::interrupt_descriptor_table diff --git a/arch/x86_64/src/context_switching/main.cpp b/arch/x86_64/src/context_switching/main.cpp new file mode 100644 index 0000000..b682e79 --- /dev/null +++ b/arch/x86_64/src/context_switching/main.cpp @@ -0,0 +1,36 @@ +#include "arch/context_switching/main.hpp" + +#include "arch/boot/pointers.hpp" +#include "arch/exception_handling/assert.hpp" +#include "arch/kernel/cpu/if.hpp" +#include "arch/kernel/cpu/jmp.hpp" +#include "arch/kernel/cpu/tr.hpp" + +namespace teachos::arch::context_switching +{ + auto initialize_descriptor_tables() -> descriptor_tables + { + decltype(auto) global_descriptor_table = segment_descriptor_table::initialize_global_descriptor_table(); + + // TODO: Replace random construction with return value of initialization. + interrupt_descriptor_table::interrupt_descriptor_table idt{}; + interrupt_descriptor_table::initialize_interrupt_descriptor_table(); + + kernel::cpu::jmp((uint64_t)&global_descriptor_table.at(1), boot::segment_register_reload_pointer); + + // Load task state segment descriptor from the last element in the global descriptor table, done by calculating + // offset in bytes to the start of the segment descriptor (5 * 16) = 80 + uint16_t const tss_selector = + (global_descriptor_table.size() - 1) * sizeof(segment_descriptor_table::segment_descriptor); + kernel::cpu::load_task_register(tss_selector); + + auto const stored_task_register = kernel::cpu::store_task_register(); + arch::exception_handling::assert(tss_selector == stored_task_register, + "[Global Descriptor Table] Loaded TR value is not the same as the stored value."); + + kernel::cpu::set_interrupt_flag(); + + descriptor_tables tables = {global_descriptor_table, idt}; + return tables; + } +} // namespace teachos::arch::context_switching diff --git a/arch/x86_64/src/context_switching/descriptor_table/access_byte.cpp b/arch/x86_64/src/context_switching/segment_descriptor_table/access_byte.cpp index 6b54451..34a10f1 100644 --- a/arch/x86_64/src/context_switching/descriptor_table/access_byte.cpp +++ b/arch/x86_64/src/context_switching/segment_descriptor_table/access_byte.cpp @@ -1,6 +1,6 @@ -#include "arch/context_switching/descriptor_table/access_byte.hpp" +#include "arch/context_switching/segment_descriptor_table/access_byte.hpp" -namespace teachos::arch::context_switching::descriptor_table +namespace teachos::arch::context_switching::segment_descriptor_table { access_byte::access_byte(uint8_t flags) : _flags(flags) @@ -12,4 +12,4 @@ namespace teachos::arch::context_switching::descriptor_table { return (std::bitset<8U>{_flags} & other) == other; } -} // namespace teachos::arch::context_switching::descriptor_table +} // namespace teachos::arch::context_switching::segment_descriptor_table diff --git a/arch/x86_64/src/context_switching/segment_descriptor_table/gdt_flags.cpp b/arch/x86_64/src/context_switching/segment_descriptor_table/gdt_flags.cpp new file mode 100644 index 0000000..9885bda --- /dev/null +++ b/arch/x86_64/src/context_switching/segment_descriptor_table/gdt_flags.cpp @@ -0,0 +1,18 @@ +#include "arch/context_switching/segment_descriptor_table/gdt_flags.hpp" + +namespace teachos::arch::context_switching::segment_descriptor_table +{ + gdt_flags::gdt_flags(uint8_t flags, std::bitset<20U> limit) + : _limit_2(limit.to_ulong() >> 16U) + , _flags(flags) + { + // Nothing to do. + } + + auto gdt_flags::contains_flags(std::bitset<4U> other) const -> bool + { + return (std::bitset<4U>{_flags} & other) == other; + } + + auto gdt_flags::get_limit() const -> std::bitset<4U> { return std::bitset<4U>{_limit_2}; } +} // namespace teachos::arch::context_switching::segment_descriptor_table diff --git a/arch/x86_64/src/context_switching/descriptor_table/global_descriptor_table.cpp b/arch/x86_64/src/context_switching/segment_descriptor_table/global_descriptor_table.cpp index 639b079..1bbd24f 100644 --- a/arch/x86_64/src/context_switching/descriptor_table/global_descriptor_table.cpp +++ b/arch/x86_64/src/context_switching/segment_descriptor_table/global_descriptor_table.cpp @@ -1,13 +1,13 @@ -#include "arch/context_switching/descriptor_table/global_descriptor_table.hpp" +#include "arch/context_switching/segment_descriptor_table/global_descriptor_table.hpp" -#include "arch/context_switching/descriptor_table/segment_descriptor.hpp" -#include "arch/context_switching/descriptor_table/task_state_segment.hpp" +#include "arch/context_switching/segment_descriptor_table/segment_descriptor.hpp" +#include "arch/context_switching/segment_descriptor_table/task_state_segment.hpp" #include "arch/exception_handling/assert.hpp" #include "arch/kernel/cpu/gdtr.hpp" #include "arch/kernel/cpu/tr.hpp" #include "arch/stl/vector.hpp" -namespace teachos::arch::context_switching::descriptor_table +namespace teachos::arch::context_switching::segment_descriptor_table { auto create_segment_descriptor(segment_descriptor_type segment_descriptor_type, access_level access_level) -> segment_descriptor @@ -89,4 +89,4 @@ namespace teachos::arch::context_switching::descriptor_table return gdt; } -} // namespace teachos::arch::context_switching::descriptor_table +} // namespace teachos::arch::context_switching::segment_descriptor_table diff --git a/arch/x86_64/src/context_switching/descriptor_table/global_descriptor_table_pointer.cpp b/arch/x86_64/src/context_switching/segment_descriptor_table/global_descriptor_table_pointer.cpp index f552496..132565f 100644 --- a/arch/x86_64/src/context_switching/descriptor_table/global_descriptor_table_pointer.cpp +++ b/arch/x86_64/src/context_switching/segment_descriptor_table/global_descriptor_table_pointer.cpp @@ -1,6 +1,6 @@ -#include "arch/context_switching/descriptor_table/global_descriptor_table_pointer.hpp" +#include "arch/context_switching/segment_descriptor_table/global_descriptor_table_pointer.hpp" -namespace teachos::arch::context_switching::descriptor_table +namespace teachos::arch::context_switching::segment_descriptor_table { global_descriptor_table_pointer::global_descriptor_table_pointer(uint16_t table_length, global_descriptor_table * address) @@ -9,4 +9,4 @@ namespace teachos::arch::context_switching::descriptor_table { // Nothing to do. } -} // namespace teachos::arch::context_switching::descriptor_table +} // namespace teachos::arch::context_switching::segment_descriptor_table diff --git a/arch/x86_64/src/context_switching/descriptor_table/segment_descriptor.cpp b/arch/x86_64/src/context_switching/segment_descriptor_table/segment_descriptor.cpp index 2385c58..6d831a1 100644 --- a/arch/x86_64/src/context_switching/descriptor_table/segment_descriptor.cpp +++ b/arch/x86_64/src/context_switching/segment_descriptor_table/segment_descriptor.cpp @@ -1,6 +1,6 @@ -#include "arch/context_switching/descriptor_table/segment_descriptor.hpp" +#include "arch/context_switching/segment_descriptor_table/segment_descriptor.hpp" -namespace teachos::arch::context_switching::descriptor_table +namespace teachos::arch::context_switching::segment_descriptor_table { segment_descriptor::segment_descriptor(uint128_t flags) : _limit_1(flags << 112U) @@ -32,4 +32,4 @@ namespace teachos::arch::context_switching::descriptor_table return _access.contains_flags(access_byte::CODE_SEGMENT) ? segment_descriptor_type::CODE_SEGMENT : segment_descriptor_type::DATA_SEGMENT; } -} // namespace teachos::arch::context_switching::descriptor_table +} // namespace teachos::arch::context_switching::segment_descriptor_table |