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#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
{
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();
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
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