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-rw-r--r--arch/x86_64/pre/src/kernel/cpu/call.cpp9
-rw-r--r--arch/x86_64/pre/src/kernel/cpu/gdtr.cpp19
-rw-r--r--arch/x86_64/pre/src/kernel/cpu/idtr.cpp18
-rw-r--r--arch/x86_64/pre/src/kernel/cpu/if.cpp7
-rw-r--r--arch/x86_64/pre/src/kernel/cpu/msr.cpp31
-rw-r--r--arch/x86_64/pre/src/kernel/cpu/segment_register.cpp98
-rw-r--r--arch/x86_64/pre/src/kernel/cpu/tr.cpp16
-rw-r--r--arch/x86_64/pre/src/kernel/main.cpp71
8 files changed, 269 insertions, 0 deletions
diff --git a/arch/x86_64/pre/src/kernel/cpu/call.cpp b/arch/x86_64/pre/src/kernel/cpu/call.cpp
new file mode 100644
index 0000000..98fa248
--- /dev/null
+++ b/arch/x86_64/pre/src/kernel/cpu/call.cpp
@@ -0,0 +1,9 @@
+#include "arch/kernel/cpu/call.hpp"
+
+namespace teachos::arch::kernel::cpu
+{
+ auto call(far_pointer pointer) -> void
+ {
+ asm volatile("rex64 lcall *%[input]" : /* no output from call */ : [input] "m"(pointer));
+ }
+} // namespace teachos::arch::kernel::cpu
diff --git a/arch/x86_64/pre/src/kernel/cpu/gdtr.cpp b/arch/x86_64/pre/src/kernel/cpu/gdtr.cpp
new file mode 100644
index 0000000..74a4e1c
--- /dev/null
+++ b/arch/x86_64/pre/src/kernel/cpu/gdtr.cpp
@@ -0,0 +1,19 @@
+#include "arch/kernel/cpu/gdtr.hpp"
+
+#include "arch/context_switching/segment_descriptor_table/global_descriptor_table_pointer.hpp"
+
+namespace teachos::arch::kernel::cpu
+{
+ auto store_global_descriptor_table() -> context_switching::segment_descriptor_table::global_descriptor_table_pointer
+ {
+ context_switching::segment_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::segment_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
diff --git a/arch/x86_64/pre/src/kernel/cpu/idtr.cpp b/arch/x86_64/pre/src/kernel/cpu/idtr.cpp
new file mode 100644
index 0000000..7aa20c1
--- /dev/null
+++ b/arch/x86_64/pre/src/kernel/cpu/idtr.cpp
@@ -0,0 +1,18 @@
+#include "arch/kernel/cpu/idtr.hpp"
+
+namespace teachos::arch::kernel::cpu
+{
+ auto store_interrupt_descriptor_table()
+ -> context_switching::interrupt_descriptor_table::interrupt_descriptor_table_pointer
+ {
+ context_switching::interrupt_descriptor_table::interrupt_descriptor_table_pointer current_value{};
+ asm("sidt %[output]" : [output] "=m"(current_value));
+ return current_value;
+ }
+
+ auto load_interrupt_descriptor_table(
+ context_switching::interrupt_descriptor_table::interrupt_descriptor_table_pointer const & idt_pointer) -> void
+ {
+ asm volatile("lidt %[input]" : /* no output from call */ : [input] "m"(idt_pointer));
+ }
+} // namespace teachos::arch::kernel::cpu
diff --git a/arch/x86_64/pre/src/kernel/cpu/if.cpp b/arch/x86_64/pre/src/kernel/cpu/if.cpp
new file mode 100644
index 0000000..60a90a3
--- /dev/null
+++ b/arch/x86_64/pre/src/kernel/cpu/if.cpp
@@ -0,0 +1,7 @@
+namespace teachos::arch::kernel::cpu
+{
+ auto set_interrupt_flag() -> void { asm volatile("sti"); }
+
+ auto clear_interrupt_flag() -> void { asm volatile("cli"); }
+
+} // namespace teachos::arch::kernel::cpu
diff --git a/arch/x86_64/pre/src/kernel/cpu/msr.cpp b/arch/x86_64/pre/src/kernel/cpu/msr.cpp
new file mode 100644
index 0000000..9c474a1
--- /dev/null
+++ b/arch/x86_64/pre/src/kernel/cpu/msr.cpp
@@ -0,0 +1,31 @@
+#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
diff --git a/arch/x86_64/pre/src/kernel/cpu/segment_register.cpp b/arch/x86_64/pre/src/kernel/cpu/segment_register.cpp
new file mode 100644
index 0000000..b08c9c4
--- /dev/null
+++ b/arch/x86_64/pre/src/kernel/cpu/segment_register.cpp
@@ -0,0 +1,98 @@
+#include "arch/kernel/cpu/segment_register.hpp"
+
+#include "arch/context_switching/interrupt_descriptor_table/segment_selector.hpp"
+#include "arch/exception_handling/assert.hpp"
+
+namespace teachos::arch::kernel::cpu
+{
+ auto reload_data_segment_registers() -> void
+ {
+ asm volatile("xor %%rax, %%rax\n"
+ "mov %%rax, %%ss\n"
+ "mov %%rax, %%ds\n"
+ "mov %%rax, %%es\n"
+ "mov %%rax, %%fs\n"
+ "mov %%rax, %%gs\n"
+ : /* no output from call */
+ : /* no input to call */
+ : "rax");
+ }
+
+ auto set_data_segment_registers(context_switching::interrupt_descriptor_table::segment_selector data_segment) -> void
+ {
+ asm volatile("xor %%rax, %%rax\n"
+ "mov %[input], %%ax\n"
+ "mov %%rax, %%ds\n"
+ "mov %%rax, %%es\n"
+ "mov %%rax, %%fs\n"
+ "mov %%rax, %%gs\n"
+ : /* no output from call */
+ : [input] "m"(data_segment)
+ : "rax");
+ }
+
+ auto read_code_segment_register() -> context_switching::interrupt_descriptor_table::segment_selector
+ {
+ context_switching::interrupt_descriptor_table::segment_selector current_value{};
+ asm volatile("mov %%cs, %[output]" : [output] "=r"(current_value));
+ return current_value;
+ }
+
+ auto validate_data_segment_registers(context_switching::interrupt_descriptor_table::segment_selector data_segment)
+ -> void
+ {
+ context_switching::interrupt_descriptor_table::segment_selector ss{};
+ context_switching::interrupt_descriptor_table::segment_selector ds{};
+ context_switching::interrupt_descriptor_table::segment_selector es{};
+ context_switching::interrupt_descriptor_table::segment_selector fs{};
+ context_switching::interrupt_descriptor_table::segment_selector gs{};
+
+ asm volatile(
+ "mov %%ss, %[ss_output]\n"
+ "mov %%ds, %[ds_output]\n"
+ "mov %%es, %[es_output]\n"
+ "mov %%fs, %[fs_output]\n"
+ "mov %%gs, %[gs_output]\n"
+ : [ss_output] "=r"(ss), [ds_output] "=r"(ds), [es_output] "=r"(es), [fs_output] "=r"(fs), [gs_output] "=r"(gs));
+
+ auto result = (ss == ds && ss == es && ss == fs && ss == gs);
+ exception_handling::assert(result, "[Segment Register] Values in data register are not the same.");
+ result = (ss == data_segment);
+ exception_handling::assert(
+ result, "[Segment Register] Expected Data Segment is not the same as the value in the Stack Segment register.");
+ }
+
+ auto validate_code_segment_register(context_switching::interrupt_descriptor_table::segment_selector code_segment)
+ -> void
+ {
+ auto const cs = read_code_segment_register();
+ exception_handling::assert(
+ cs == code_segment,
+ "[Segment Register] Expected Code Segment is not the same as the value in the Code Segment register.");
+ }
+
+ auto validate_segment_registers(context_switching::interrupt_descriptor_table::segment_selector data_segment,
+ context_switching::interrupt_descriptor_table::segment_selector code_segment) -> void
+ {
+ validate_data_segment_registers(data_segment);
+ validate_code_segment_register(code_segment);
+ }
+
+ auto set_code_segment_register(context_switching::interrupt_descriptor_table::segment_selector data_segment,
+ context_switching::interrupt_descriptor_table::segment_selector code_segment,
+ uint64_t address) -> void
+ {
+ asm volatile("mov %%rsp, %%rax\n"
+ "push %[data_segment]\n"
+ "push %%rax\n"
+ "pushfq\n"
+ "push %[code_segment]\n"
+ "mov %[return_function], %%rax\n"
+ "push %%rax\n"
+ "iretq\n"
+ : /* no output from call */
+ : [data_segment] "m"(data_segment), [code_segment] "m"(code_segment), [return_function] "r"(address)
+ : "rax");
+ }
+
+} // namespace teachos::arch::kernel::cpu
diff --git a/arch/x86_64/pre/src/kernel/cpu/tr.cpp b/arch/x86_64/pre/src/kernel/cpu/tr.cpp
new file mode 100644
index 0000000..a435540
--- /dev/null
+++ b/arch/x86_64/pre/src/kernel/cpu/tr.cpp
@@ -0,0 +1,16 @@
+#include "arch/kernel/cpu/tr.hpp"
+
+namespace teachos::arch::kernel::cpu
+{
+ auto store_task_register() -> uint16_t
+ {
+ uint16_t current_value{};
+ asm("str %[output]" : [output] "=r"(current_value));
+ return current_value;
+ }
+
+ auto load_task_register(uint16_t gdt_offset) -> void
+ {
+ asm volatile("ltr %[input]" : /* no output from call */ : [input] "m"(gdt_offset));
+ }
+} // namespace teachos::arch::kernel::cpu
diff --git a/arch/x86_64/pre/src/kernel/main.cpp b/arch/x86_64/pre/src/kernel/main.cpp
new file mode 100644
index 0000000..43b5f90
--- /dev/null
+++ b/arch/x86_64/pre/src/kernel/main.cpp
@@ -0,0 +1,71 @@
+#include "arch/kernel/main.hpp"
+
+#include "arch/boot/pointers.hpp"
+#include "arch/context_switching/interrupt_descriptor_table/segment_selector.hpp"
+#include "arch/context_switching/main.hpp"
+#include "arch/kernel/cpu/if.hpp"
+#include "arch/kernel/cpu/segment_register.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
+{
+ auto stack_overflow_test(int count) -> int
+ {
+ int test[5000] = {};
+ if (test[0] == 0xFFFF)
+ {
+ return count;
+ }
+ count = stack_overflow_test(count);
+ return count++;
+ }
+
+ auto heap_test() -> void
+ {
+ auto test2 = new memory::multiboot::memory_information{};
+ auto test3 = new memory::multiboot::memory_information{};
+ auto test4 = *test2;
+ auto test5 = *test3;
+ test4.kernel_end = 5000;
+ test5.kernel_end = 3000;
+ auto test6 = test4.kernel_end;
+ auto test7 = test5.kernel_end;
+ auto test8 = memory::multiboot::read_multiboot2();
+ if (test6 && test7 && test8.kernel_end)
+ {
+ video::vga::text::write("Heap test successful", video::vga::text::common_attributes::green_on_black);
+ }
+ test2->kernel_end = 2000;
+ test2->kernel_start = 1000;
+ test2->multiboot_start = 2000;
+ delete test2;
+ delete test3;
+
+ auto test9 = new int(50);
+ delete test9;
+ }
+
+ auto main() -> void
+ {
+ video::vga::text::clear();
+ video::vga::text::cursor(false);
+ video::vga::text::write("TeachOS is starting up...", video::vga::text::common_attributes::green_on_black);
+ video::vga::text::newline();
+
+ memory::initialize_memory_management();
+ // stack_overflow_test(0);
+
+ memory::heap::global_heap_allocator::register_heap_allocator(memory::heap::heap_allocator_type::LINKED_LIST);
+ // heap_test();
+
+ auto address = memory::heap::global_heap_allocator::kmalloc(8U);
+ (void)address;
+
+ context_switching::switch_to_user_mode();
+ }
+} // namespace teachos::arch::kernel
generated by cgit v1.2.3 (git 2.25.1) at 2026-04-19 12:57:24 +0000