#include "arch/user/main.hpp" #include "arch/context_switching/syscall/main.hpp" #include "arch/memory/heap/global_heap_allocator.hpp" // TODO: Disallow these imports #include "arch/kernel/cpu/if.hpp" #include "arch/video/vga/text.hpp" namespace teachos::arch::user { auto main() -> void { char constexpr syscall_message[] = "Successfully entered user mode and wrote to VGA buffer via syscall!"; context_switching::syscall::syscall(context_switching::syscall::type::WRITE, {reinterpret_cast(&syscall_message)}); // kernel::cpu::clear_interrupt_flag(); // Causes crash Kernel Code (.text) is not mapped in User mMde auto test = memory::heap::global_heap_allocator::malloc(20U); (void)test; // auto test = new int{20}; // Causes crash Heap is not mapped in User Mode // (void)test; // if (!error) // { // // Causes crash vga is not mapped in User Mode // video::vga::text::write("Successfully made a SYSCALL and returned with SYSRETQ!", // video::vga::text::common_attributes::green_on_black); // } for (;;) { } } } // namespace teachos::arch::user