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#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;
}
[[gnu::naked]]
auto push_code_segment(context_switching::interrupt_descriptor_table::segment_selector segment_selector_a,
context_switching::interrupt_descriptor_table::segment_selector segment_selector_b) -> void
{
asm volatile("push %%rbp\n"
"push %[input]"
: /* No output from call */
: [input] "m"(segment_selector_a));
asm volatile("mov %[input], %%ax\n"
"mov %%ax, %%ss\n"
"mov %%ax, %%ds\n"
"mov %%ax, %%es\n"
"mov %%ax, %%fs\n"
"mov %%ax, %%gs"
: /* No output from call */
: [input] "m"(segment_selector_b));
asm volatile("iret"
: /* No output from call */
: /* No input to call */);
}
[[gnu::naked]]
auto iret() -> void
{
asm volatile("iret"
: /* No output from call */
: /* No input to call */);
}
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();
decltype(auto) descriptor_tables = context_switching::initialize_descriptor_tables();
// - Clear NT flag in EFLAGS register (for far return)
// - Push return instruction pointer
// - Push return code segment selector
// context_switching::interrupt_descriptor_table::segment_selector user_code_segment_selector{
// 3U, context_switching::interrupt_descriptor_table::segment_selector::REQUEST_LEVEL_USER};
// context_switching::interrupt_descriptor_table::segment_selector user_data_segment_selector{
// 4U, context_switching::interrupt_descriptor_table::segment_selector::REQUEST_LEVEL_USER};
// push_code_segment(user_code_segment_selector, user_data_segment_selector);
boot::context_switch();
(void)descriptor_tables;
}
} // namespace teachos::arch::kernel
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