Merge branch 'develop-BA-FS26' into 'develop'HEADdevelop

Merge of BA-FS26 branch into develop

See merge request teachos/kernel!49

12 files changed, 0 insertions, 1216 deletions

diff --git a/arch/x86_64/src/boot/boot32.S b/arch/x86_64/src/boot/boot32.S
deleted file mode 100644
index 1c2fdaf..0000000
--- a/arch/x86_64/src/boot/boot32.S
+++ /dev/null
@@ -1,443 +0,0 @@
-#include "arch/boot/boot.hpp"
-
-/**
- * @brief Uninitialized data for the bootstrapping process.
- */
-.section .boot_bss, "aw", @nobits
-
-page_maps_start:
-page_map_level_4:      .skip 512 * 8
-page_map_level_3_high: .skip 512 * 8
-page_map_level_3_low:  .skip 512 * 8
-page_map_level_2:      .skip 512 * 8
-page_maps_end = .
-page_maps_size = page_maps_end - page_maps_start
-
-/**
- * @brief Storage for the multiboot2 information pointer.
- */
-.global multiboot_information_pointer
-multiboot_information_pointer: .skip 8
-
-/**
- * @brief Storage for the bootstrap stack.
- */
-.section .boot_stack, "aw", @nobits
-.align 16
-
-early_stack_bottom: .skip 1 << 8
-early_stack_top:
-early_stack_size = early_stack_top - early_stack_bottom
-
-/**
- * @brief Constants for the bootstrapping process.
- */
-.section .boot_rodata, "a", @progbits
-
-.global global_descriptor_table_data
-
-/**
- * @brief A basic GDT for long mode.
- */
-global_descriptor_table:
-global_descriptor_table_null = . - global_descriptor_table
-.quad 0
-global_descriptor_table_code = . - global_descriptor_table
-.quad GDT_READ_WRITE | GDT_EXECUTABLE | GDT_DESCRIPTOR_TYPE | GDT_PRESENT | GDT_LONG_MODE | (1 << 55)
-global_descriptor_table_data = . - global_descriptor_table
-.quad GDT_READ_WRITE | GDT_DESCRIPTOR_TYPE | GDT_PRESENT | (1 << 54) | (1 << 55)
-global_descriptor_table_end:
-
-message_prefix_panic:                    .string  "Panic: "
-message_not_loaded_by_multiboot2:        .string  "The operating system was not loaded by a Multiboot 2 loader."
-message_cpuid_instruction_no_supported:  .string  "The 'cpuid' instruction is not supported on this platform."
-message_long_mode_not_supported:         .string  "Long mode is not supported by this platform."
-message_return_from_kernel_main:         .string  "Execution returned from kernel main."
-
-/**
- * @brief Initialized data for the bootstrapping process.
- */
-.section .boot_data, "aw", @progbits
-
-/**
- * @brief A pointer to the current position within the VGA text buffer.
- */
-.global vga_buffer_pointer
-vga_buffer_pointer: .quad 0xb8000
-
-/**
- * @brief Code for the bootstrapping process.
- */
-.section .boot_text, "ax", @progbits
-.align 16
-.code32
-
-.macro pie_base
-    push %esi
-    call 0f
-    0:
-    pop %esi
-.endm
-
-.macro function_start
-    push %ebp
-    mov  %esp, %ebp
-.endm
-
-.macro function_end
-    leave
-    ret
-.endm
-
-.macro pie_function_start
-    function_start
-    pie_base
-.endm
-
-.macro pie_function_end
-    pop %esi
-    function_end
-.endm
-
-/**
- * @brief Prepare the environment and start the kernel.
- *
- * This function performs all necessary checks to ensure the system was loaded
- * by the expected loader and supports all features required to run the kernel.
- * If successful, it prepares the system by setting up memory virtualization
- * and then start the kernel proper.
- *
- * @param %eax The Multiboot 2 magic marker.
- * @param %ebx The Multiboot 2 information pointer.
- * @return void This function does not return.
- */
-.global _start
-_start:
-    call 0f
-0:
-    pop %esi
-
-    lea (early_stack_top - 0b)(%esi), %ecx
-
-    mov %ecx, %esp
-    mov %esp, %ebp
-
-    call _assert_loaded_by_multiboot2_loader
-    call _save_multiboot_information_pointer
-
-    call _assert_cpuid_instruction_is_supported
-    call _assert_cpu_supports_long_mode
-
-    push $HUGE_PAGES_TO_MAP
-    call _prepare_page_maps
-    add $4, %esp
-
-    call _enable_paging
-    call _enable_sse
-    call _reload_gdt
-
-    lea (_entry64 - 0b)(%esi), %eax
-    pushl $global_descriptor_table_code
-    pushl %eax
-    lret
-
-/**
- * @brief Halt the system.
- *
- * This function will instruct the CPU to halt. It will try to keep the CPU
- * halted, even if interrupts occur.
- *
- * @return This function never returns.
- */
-_halt:
-    function_start
-
-1:
-    hlt
-    jmp 1b
-
-    function_end
-
-/**
- * @brief Print a message via the VGA text buffer.
- *
- * @param ebp+12 The message to print.
- * @param ebp+8  The color to print the message in.
- */
-_print:
-    pie_function_start
-
-    push %edi
-    push %ebx
-
-    mov 8(%ebp), %al
-    mov 12(%ebp), %edx
-    mov $0, %ecx
-    lea (vga_buffer_pointer - 0b)(%esi), %edi
-    mov (%edi), %edi
-
-1:
-    mov (%edx, %ecx), %bl
-    test %bl, %bl
-    je 2f
-    mov %bl, (%edi, %ecx, 2)
-    mov %al, 1(%edi, %ecx, 2)
-    inc %ecx
-    jmp 1b
-
-2:
-    shl $1, %ecx
-    add %ecx, %edi
-    lea (vga_buffer_pointer - 0b)(%esi), %ecx
-    mov %edi, (%ecx)
-
-    pop %ebx
-    pop %edi
-
-    pie_function_end
-
-/**
- * @brief Print a given panic message and then halt the machine as if by calling ::halt()
- *
- * @param ebp+4 A message to print.
- * @return This function does not return.
- */
-_panic:
-    pie_function_start
-
-    lea (message_prefix_panic - 0b)(%esi), %eax
-
-    push %eax
-    push $0x4f
-    call _print
-
-    mov  8(%ebp), %eax
-    mov  %eax, 4(%esp)
-    call _print
-    add $8, %esp
-
-    call _halt
-
-    pie_function_end
-
-/**
- * Assert that we were loaded by a Multiboot 2 compliant bootloader.
- *
- * This assertion will panic the system if the magic signature was not found.
- * If we were loaded my an appropriate bootloader, this function also saves
- * the provided MBI pointer to `multiboot_information_pointer`.
- */
-_assert_loaded_by_multiboot2_loader:
-    pie_function_start
-
-    cmp $MULTIBOOT2_MAGIC, %eax
-    je 1f
-    lea (message_not_loaded_by_multiboot2 - 0b)(%esi), %eax
-    push %eax
-    call _panic
-1:
-    pie_function_end
-
-/**
- * @brief Store the multiboot 2 information pointer in the global memory.
- *
- * @return void
- */
-_save_multiboot_information_pointer:
-    pie_function_start
-
-    lea (multiboot_information_pointer - 0b)(%esi), %eax
-    mov %ebx, (%eax)
-
-    pie_function_end
-
-/**
- * @brief Assert that the CPU supports the CPUID instruction.
- *
- * The primary way to check for support of the instruction is to flip the ID
- * bin in EFLAGS and then check if this changed was accepted. If so, the CPU
- * supports the CPUID instruction, otherwise it most-likely doesn't.
- */
-_assert_cpuid_instruction_is_supported:
-    pie_function_start
-
-    pushfl
-    pop %eax
-    mov %eax, %ecx
-
-    xor $(1 << 21), %eax  /* Flip the ID bit */
-    push %eax             /* Move the new bitset on the stack for loading */
-    popfl                 /* Load the flags with ID set back into EFLAGS */
-    pushfl                /* Copy the flags back onto the stack */
-    pop %eax              /* Load the flags for further checking */
-
-    push %ecx
-    popfl
-
-    cmp %ecx, %eax
-    jne 1f
-    lea (message_cpuid_instruction_no_supported - 0b)(%esi), %eax
-    push %eax
-    call _panic
-
-1:
-    pie_function_end
-
-/**
- * @brief Assert that the CPU supports going into long mode.
- */
-_assert_cpu_supports_long_mode:
-    pie_function_start
-
-    mov $0x80000000, %eax
-    cpuid
-    cmp $0x80000001, %eax
-    jb 1f
-
-    mov $0x80000001, %eax
-    cpuid
-    test $(1 << 29), %edx
-    jnz 2f
-1:
-    lea (message_long_mode_not_supported - 0b)(%esi), %eax
-    push %eax
-    call _panic
-2:
-    pie_function_end
-
-/**
- * @brief Prepare a basic page map hierarchy
- *
- * @param ebp+8 The number of huge pages to map
- * @return void
- */
-_prepare_page_maps:
-    pie_function_start
-
-    push %edi
-
-    call _clear_page_map_memory
-
-    lea (page_map_level_4 - 0b)(%esi), %edi
-    lea (page_map_level_3_low - 0b)(%esi), %eax
-    or $0b11, %eax
-    mov %eax, (%edi)
-
-    lea (page_map_level_3_high - 0b)(%esi), %eax
-    or $0b11, %eax
-    mov %eax, (511 * 8)(%edi)
-
-    lea (page_map_level_3_low - 0b)(%esi), %edi
-    lea (page_map_level_2 - 0b)(%esi), %eax
-    or $0b11, %eax
-    mov %eax, (%edi)
-
-    lea (page_map_level_3_high - 0b)(%esi), %edi
-    lea (page_map_level_2 - 0b)(%esi), %eax
-    or $0b11, %eax
-    mov %eax, (510 * 8)(%edi)
-
-    lea (page_map_level_2 - 0b)(%esi), %edi
-    mov 8(%ebp), %ecx
-
-1:
-    dec %ecx
-    mov $(1 << 21), %eax
-    mul %ecx
-    or $0b10000011, %eax
-    mov %eax, (%edi, %ecx, 8)
-
-    test %ecx, %ecx
-    jnz 1b
-
-    pop %edi
-
-    pie_function_end
-
-/**
- * @brief Clear all page map memory by filling it with 0s.
- *
- * @return void
- */
-_clear_page_map_memory:
-    pie_function_start
-
-    push %edi
-
-    xor %eax, %eax
-    mov $page_maps_size, %ecx
-    shr $2, %ecx
-    lea (page_maps_start - 0b)(%esi), %edi
-    rep stosl
-
-    pop %edi
-
-    pie_function_end
-
-/**
- * @p Enable memory virtualization via paging.
- *
- * Note: This routine expects for there to be a valid set of page maps already
- * set up for use.
- *
- * @return void
- */
-_enable_paging:
-    pie_function_start
-
-    lea (page_map_level_4 - 0b)(%esi), %eax
-    mov %eax, %cr3
-
-    /* Enable Physical Address Extension */
-    mov %cr4, %eax
-    or $(1 << 5), %eax
-    mov %eax, %cr4
-
-    /* Enable long mode support */
-    mov $0xC0000080, %ecx
-    rdmsr
-    or $(1 << 8), %eax
-    wrmsr
-
-    /* Enable paging */
-    mov %cr0, %eax
-    or $(1 << 31), %eax
-    mov %eax, %cr0
-
-    pie_function_end
-
-/**
- * @brief Enable use of SSE instructions.
- */
-_enable_sse:
-    function_start
-
-    mov %cr0, %eax
-    and $0xfffffffb, %eax
-    or $0x00000002, %eax
-    mov %eax, %cr0
-
-    mov %cr4, %eax
-    or $(3 << 9), %eax
-    mov %eax, %cr4
-
-    function_end
-
-/**
- * @brief Prepare a new GTD and load make it active.
- *
- * @return void
- */
-_reload_gdt:
-    pie_function_start
-
-    sub $10, %esp
-    lea (global_descriptor_table - 0b)(%esi), %eax
-    movw $(global_descriptor_table_end - global_descriptor_table -1), (%esp)
-    mov %eax, 2(%esp)
-    movl $0, 6(%esp)
-
-    lgdt (%esp)
-    add $10, %esp
-
-    pie_function_end
diff --git a/arch/x86_64/src/boot/entry64.s b/arch/x86_64/src/boot/entry64.s
deleted file mode 100644
index 29fb778..0000000
--- a/arch/x86_64/src/boot/entry64.s
+++ /dev/null
@@ -1,62 +0,0 @@
-.section .stack, "aw", @nobits
-
-.align 16
-.global stack_top
-stack_bottom: .skip 1 << 20
-stack_top:
-stack_size = stack_top - stack_bottom
-
-.section .bss, "aw", @nobits
-
-//! A structure containing information gathered during the bootstrap process.
-//! Expected layout (as described by teachos::boot::information):
-//!
-//! struct
-//! {
-//!   multiboot2::information_view const * mbi;
-//!   std::size_t vga_buffer_index;
-//! }
-.global bootstrap_information
-bootstrap_information: .skip 16
-
-.section .boot_text, "ax", @progbits
-.code64
-
-.global _entry64
-_entry64:
-    mov $global_descriptor_table_data, %rax
-    mov %rax, %ss
-    mov %rax, %ds
-    mov %rax, %es
-    mov %rax, %fs
-    mov %rax, %gs
-
-    mov $stack_top, %rsp
-    mov %rsp, %rbp
-
-    mov multiboot_information_pointer, %rax
-    or $TEACHOS_VMA, %rax
-    mov vga_buffer_pointer, %rdx
-    sub $0xb8000, %rdx
-    mov %rax, (bootstrap_information)
-    mov %rdx, (bootstrap_information + 8)
-
-    call invoke_global_constructors
-    
-    xor %rax, %rax
-    mov %rax, %rbp
-    mov %rax, %rdx
-    mov %rax, %rsi
-
-    mov $stack_size, %rcx
-    shr $3, %rcx
-    lea (stack_bottom), %rdi
-    rep stosq
-
-    mov %rax, %rdi
-
-    call main
-
-1:
-    hlt
-    jmp 1b
diff --git a/arch/x86_64/src/boot/initialize_runtime.cpp b/arch/x86_64/src/boot/initialize_runtime.cpp
deleted file mode 100644
index b08c13c..0000000
--- a/arch/x86_64/src/boot/initialize_runtime.cpp
+++ /dev/null
@@ -1,22 +0,0 @@
-#include <algorithm>
-#include <functional>
-#include <span>
-
-namespace arch::boot
-{
-
-  extern "C"
-  {
-    using global_initializer = auto (*)() -> void;
-
-    extern global_initializer __init_array_start;
-    extern global_initializer __init_array_end;
-
-    auto invoke_global_constructors() -> void
-    {
-      auto initializers = std::span{&__init_array_start, &__init_array_end};
-      std::ranges::for_each(initializers, [](auto invokable) { std::invoke(invokable); });
-    }
-  }
-
-}  // namespace arch::boot
\ No newline at end of file
diff --git a/arch/x86_64/src/boot/multiboot.s b/arch/x86_64/src/boot/multiboot.s
deleted file mode 100644
index 7ccca56..0000000
--- a/arch/x86_64/src/boot/multiboot.s
+++ /dev/null
@@ -1,26 +0,0 @@
-.section .boot_mbh, "a"
-.align 8
-
-multiboot_header_start:
-.Lmagic:
-    .long 0xe85250d6
-.Larch:
-    .long 0
-.Llength:
-    .long multiboot_header_end - multiboot_header_start
-.Lchecksum:
-    .long 0x100000000 - (0xe85250d6 + 0 + (multiboot_header_end - multiboot_header_start))
-.align 8
-.Lflags_start:
-    .word 4
-    .word 1
-    .long .Lflags_end - .Lflags_start
-    .long 3
-.Lflags_end:
-.align 8
-.Lend_start:
-    .word 0
-    .word 0
-    .long .Lend_end - .Lend_start
-.Lend_end:
-multiboot_header_end:
diff --git a/arch/x86_64/src/debug/qemu_output.cpp b/arch/x86_64/src/debug/qemu_output.cpp
deleted file mode 100644
index 535017d..0000000
--- a/arch/x86_64/src/debug/qemu_output.cpp
+++ /dev/null
@@ -1,25 +0,0 @@
-#include "arch/debug/qemu_output.hpp"
-
-#include "kapi/cio.hpp"
-
-#include <algorithm>
-#include <string_view>
-
-namespace arch::debug
-{
-
-  qemu_output::qemu_output(output_device & lower)
-      : m_lower{lower}
-      , m_present{port::read() == port::address}
-  {}
-
-  auto qemu_output::write(kapi::cio::output_stream stream, std::string_view text) -> void
-  {
-    if (m_present)
-    {
-      std::ranges::for_each(text, port::write<port::value_type>);
-    }
-    m_lower.write(stream, text);
-  }
-
-}  // namespace arch::debug
diff --git a/arch/x86_64/src/memory/higher_half_mapper.cpp b/arch/x86_64/src/memory/higher_half_mapper.cpp
deleted file mode 100644
index abb54a3..0000000
--- a/arch/x86_64/src/memory/higher_half_mapper.cpp
+++ /dev/null
@@ -1,119 +0,0 @@
-#include "arch/memory/higher_half_mapper.hpp"
-
-#include "kapi/memory.hpp"
-#include "kapi/system.hpp"
-
-#include "arch/memory/page_table.hpp"
-#include "arch/memory/page_utilities.hpp"
-
-#include <algorithm>
-#include <array>
-#include <cstddef>
-#include <memory>
-#include <ranges>
-#include <utility>
-
-namespace arch::memory
-{
-
-  higher_half_mapper::higher_half_mapper(page_table * root)
-      : m_root{root}
-  {}
-
-  auto higher_half_mapper::map(kapi::memory::page page, kapi::memory::frame frame, flags flags) -> std::byte *
-  {
-    auto table = get_or_create_page_table(page);
-    if (!table)
-    {
-      return nullptr;
-    }
-
-    auto const index = pml_index(1, page);
-    auto & entry = (*table)[index];
-
-    if (entry.present())
-    {
-      kapi::system::panic("[x86_64:MEM] Tried to map a page that is already mapped!");
-    }
-
-    entry.frame(frame, to_table_flags(flags) | page_table::entry::flags::present);
-
-    return static_cast<std::byte *>(page.start_address());
-  }
-
-  auto higher_half_mapper::unmap(kapi::memory::page page) -> void
-  {
-    if (!try_unmap(page))
-    {
-      kapi::system::panic("[x86_64:MEM] Tried to unmap a page that is not mapped!");
-    }
-  }
-
-  auto higher_half_mapper::try_unmap(kapi::memory::page page) noexcept -> bool
-  {
-    auto table_path = std::array<std::pair<page_table *, std::size_t>, 4>{};
-    table_path[0] = std::pair{m_root, pml_index(4, page)};
-
-    for (auto level = 4uz; level > 1uz; --level)
-    {
-      auto [table, index] = table_path[4 - level];
-      auto & entry = (*table)[index];
-
-      if (!entry.present())
-      {
-        return false;
-      }
-
-      auto next_table = to_higher_half_pointer<page_table>(entry.frame()->start_address());
-      auto next_index = pml_index(4 - level - 1, page);
-      table_path[4 - level - 1] = std::pair{next_table, next_index};
-    }
-
-    std::ranges::for_each(std::views::reverse(table_path), [previous_was_empty = true](auto & step) mutable {
-      auto [table, index] = step;
-      auto & entry = (*table)[index];
-      auto frame = entry.frame();
-
-      if (previous_was_empty)
-      {
-        entry.clear();
-        previous_was_empty = table->empty();
-        kapi::memory::get_frame_allocator().release(*frame);
-      }
-    });
-
-    return true;
-  }
-
-  auto higher_half_mapper::get_or_create_page_table(kapi::memory::page page) noexcept -> page_table *
-  {
-    auto table = m_root;
-
-    for (auto level = 4uz; level > 1uz; --level)
-    {
-      auto index = pml_index(level, page);
-      auto & entry = (*table)[index];
-
-      if (!entry.present())
-      {
-        auto table_frame = kapi::memory::allocate_frame();
-        if (!table_frame)
-        {
-          return nullptr;
-        }
-
-        auto new_table = to_higher_half_pointer<page_table>(table_frame->start_address());
-        std::construct_at(new_table);
-
-        auto const flags = page_table::entry::flags::present | page_table::entry::flags::writable |
-                           page_table::entry::flags::user_accessible;
-        entry.frame(*table_frame, flags);
-      }
-
-      table = to_higher_half_pointer<page_table>(entry.frame()->start_address());
-    }
-
-    return table;
-  }
-
-}  // namespace arch::memory
\ No newline at end of file
diff --git a/arch/x86_64/src/memory/kernel_mapper.cpp b/arch/x86_64/src/memory/kernel_mapper.cpp
deleted file mode 100644
index 08c32c5..0000000
--- a/arch/x86_64/src/memory/kernel_mapper.cpp
+++ /dev/null
@@ -1,113 +0,0 @@
-#include "arch/memory/kernel_mapper.hpp"
-
-#include "kapi/memory.hpp"
-#include "kapi/system.hpp"
-
-#include "arch/boot/ld.hpp"
-
-#include <kstd/print>
-
-#include <elf/format.hpp>
-#include <elf/section_header.hpp>
-#include <multiboot2/information.hpp>
-
-#include <algorithm>
-#include <array>
-#include <bit>
-#include <cstdint>
-#include <ranges>
-#include <string_view>
-#include <utility>
-
-namespace arch::memory
-{
-
-  namespace
-  {
-    using namespace std::string_view_literals;
-
-    constexpr auto static ignored_section_prefixes = std::array{
-      ".boot_"sv,
-    };
-
-    constexpr auto static user_accessible_prefixes = std::array{
-      ".user"sv,
-      ".stl"sv,
-    };
-
-  }  // namespace
-
-  kernel_mapper::kernel_mapper(multiboot2::information_view const * mbi)
-      : m_mbi{std::move(mbi)}
-      , m_kernel_load_base{std::bit_cast<std::uintptr_t>(&arch::boot::TEACHOS_VMA)}
-  {}
-
-  auto kernel_mapper::remap_kernel(kapi::memory::page_mapper & mapper) -> void
-  {
-    auto elf_information = m_mbi->maybe_elf_symbols<elf::format::elf64>();
-    if (!elf_information)
-    {
-      kapi::system::panic("[x86_64:MEM] ELF section information is not available.");
-    }
-
-    auto sections = *elf_information;
-    auto allocated_sections =
-        std::views::all(sections) | std::views::filter(&elf::section_header<elf::format::elf64>::allocated) |
-        std::views::filter([&](auto const & section) -> auto {
-          auto name = sections.name(section);
-          return !std::ranges::any_of(ignored_section_prefixes,
-                                      [&](auto const & prefix) -> auto { return name.starts_with(prefix); });
-        });
-
-    if (allocated_sections.empty())
-    {
-      kapi::system::panic("[x86_64:MEM] No allocated ELF sections were found.");
-    }
-
-    std::ranges::for_each(allocated_sections,
-                          [&](auto const & section) -> auto { map_section(section, sections.name(section), mapper); });
-  }
-
-  auto kernel_mapper::map_section(section_header_type const & section, std::string_view name,
-                                  kapi::memory::page_mapper & mapper) -> void
-  {
-    auto number_of_pages = (section.size + (PLATFORM_PAGE_SIZE - 1)) / PLATFORM_PAGE_SIZE;
-    auto linear_start_address = kapi::memory::linear_address{section.virtual_load_address};
-    auto physical_start_address = kapi::memory::physical_address{section.virtual_load_address & ~m_kernel_load_base};
-
-    kstd::println("[x86_64:MEM] mapping {}"
-                  "\n  {} bytes -> page count: {}"
-                  "\n  {} @ {}",
-                  name, section.size, number_of_pages, linear_start_address, physical_start_address);
-
-    auto first_page = kapi::memory::page::containing(linear_start_address);
-    auto first_frame = kapi::memory::frame::containing(physical_start_address);
-
-    auto page_flags = kapi::memory::page_mapper::flags::empty;
-
-    if (section.writable())
-    {
-      page_flags |= kapi::memory::page_mapper::flags::writable;
-    }
-
-    if (section.executable())
-    {
-      page_flags |= kapi::memory::page_mapper::flags::executable;
-    }
-
-    auto is_prefix_of_name = [=](auto prefix) -> bool {
-      return name.starts_with(prefix);
-    };
-
-    if (!std::ranges::any_of(user_accessible_prefixes, is_prefix_of_name))
-    {
-      page_flags |= kapi::memory::page_mapper::flags::supervisor_only;
-    }
-
-    for (auto i = 0uz; i < number_of_pages; ++i)
-    {
-      mapper.map(first_page + i, first_frame + i, page_flags);
-    }
-  }
-
-}  // namespace arch::memory
\ No newline at end of file
diff --git a/arch/x86_64/src/memory/mmu.cpp b/arch/x86_64/src/memory/mmu.cpp
deleted file mode 100644
index ea23278..0000000
--- a/arch/x86_64/src/memory/mmu.cpp
+++ /dev/null
@@ -1,19 +0,0 @@
-#include "arch/memory/mmu.hpp"
-
-#include "kapi/memory.hpp"
-
-#include "arch/cpu/registers.hpp"
-
-namespace arch::memory
-{
-  auto tlb_flush(kapi::memory::linear_address address) -> void
-  {
-    asm volatile("invlpg (%[input])" : /* no output from call */ : [input] "r"(address) : "memory");
-  }
-
-  auto tlb_flush_all() -> void
-  {
-    auto paging_root = cpu::cr3::read();
-    cpu::cr3::write(paging_root);
-  }
-}  // namespace arch::memory
diff --git a/arch/x86_64/src/memory/page_table.cpp b/arch/x86_64/src/memory/page_table.cpp
deleted file mode 100644
index 26cdd29..0000000
--- a/arch/x86_64/src/memory/page_table.cpp
+++ /dev/null
@@ -1,82 +0,0 @@
-#include "arch/memory/page_table.hpp"
-
-#include "kapi/memory.hpp"
-
-#include <algorithm>
-#include <bit>
-#include <cstddef>
-#include <cstdint>
-#include <optional>
-#include <utility>
-
-namespace arch::memory
-{
-
-  auto page_table::entry::clear() noexcept -> void
-  {
-    m_raw = 0;
-  }
-
-  auto page_table::entry::present() const noexcept -> bool
-  {
-    return (all_flags() & flags::present) != flags::empty;
-  }
-
-  auto page_table::entry::huge() const noexcept -> bool
-  {
-    return (all_flags() & flags::huge_page) != flags::empty;
-  }
-
-  auto page_table::entry::all_flags() const noexcept -> flags
-  {
-    return std::bit_cast<flags>(m_raw & ~frame_number_mask);
-  }
-
-  auto page_table::entry::all_flags(flags flags) noexcept -> void
-  {
-    m_raw = (m_raw & ~frame_number_mask) | std::to_underlying(flags);
-  }
-
-  auto page_table::entry::operator|=(flags rhs) noexcept -> page_table::entry &
-  {
-    auto raw_flags = std::to_underlying(rhs) & ~frame_number_mask;
-    m_raw |= raw_flags;
-    return *this;
-  }
-
-  auto page_table::entry::frame() const noexcept -> std::optional<kapi::memory::frame>
-  {
-    if (present())
-    {
-      return kapi::memory::frame::containing(kapi::memory::physical_address{m_raw & frame_number_mask});
-    }
-    return std::nullopt;
-  }
-
-  auto page_table::entry::frame(kapi::memory::frame frame, flags flags) noexcept -> void
-  {
-    m_raw = (frame.start_address().raw() | static_cast<std::uint64_t>(flags));
-  };
-
-  auto page_table::operator[](std::size_t index) -> entry &
-  {
-    return m_entries.at(index);
-  }
-
-  auto page_table::operator[](std::size_t index) const -> entry const &
-  {
-    return m_entries.at(index);
-  }
-
-  auto page_table::clear() noexcept -> void
-  {
-    std::ranges::for_each(m_entries, &page_table::entry::clear);
-  }
-
-  auto page_table::empty() const noexcept -> bool
-  {
-    return std::ranges::all_of(m_entries,
-                               [](auto const & entry) -> auto { return entry.all_flags() == entry::flags::empty; });
-  }
-
-}  // namespace arch::memory
diff --git a/arch/x86_64/src/memory/region_allocator.cpp b/arch/x86_64/src/memory/region_allocator.cpp
deleted file mode 100644
index facb1f2..0000000
--- a/arch/x86_64/src/memory/region_allocator.cpp
+++ /dev/null
@@ -1,144 +0,0 @@
-#include "arch/memory/region_allocator.hpp"
-
-#include "kapi/memory/address.hpp"
-#include "kapi/memory/frame.hpp"
-
-#include <multiboot2/information.hpp>
-
-#include <algorithm>
-#include <cstddef>
-#include <optional>
-#include <ranges>
-#include <utility>
-
-namespace arch::memory
-{
-  namespace
-  {
-    constexpr auto last_frame(multiboot2::memory_map::region const & region)
-    {
-      return kapi::memory::frame::containing(kapi::memory::physical_address{region.base + region.size_in_B - 1});
-    }
-
-    constexpr auto falls_within(kapi::memory::frame const & candidate, kapi::memory::frame const & start,
-                                kapi::memory::frame const & end)
-    {
-      return candidate >= start && candidate <= end;
-    }
-  }  // namespace
-
-  region_allocator::region_allocator(memory_information const & mem_info)
-      : m_next_frame{}
-      , m_current_region{}
-      , m_memory_map{mem_info.memory_map}
-      , m_kernel_start{kapi::memory::frame::containing(mem_info.image_range.first)}
-      , m_kernel_end{kapi::memory::frame::containing(mem_info.image_range.second)}
-      , m_multiboot_start{kapi::memory::frame::containing(mem_info.mbi_range.first)}
-      , m_multiboot_end{kapi::memory::frame::containing(mem_info.mbi_range.second)}
-  // TODO BA-FS26: Protect MB2 boot modules
-  {
-    choose_next_region();
-  }
-
-  auto region_allocator::choose_next_region() -> void
-  {
-    m_current_region.reset();
-
-    auto remaining_regions =
-        m_memory_map |  //
-        std::views::filter(&multiboot2::memory_map::region::available) |
-        std::views::filter([this](auto const & region) -> bool { return last_frame(region) >= m_next_frame; });
-
-    auto lowest_region =
-        std::ranges::min_element(remaining_regions, [](auto lhs, auto rhs) -> bool { return lhs.base < rhs.base; });
-
-    if (lowest_region == remaining_regions.end())
-    {
-      return;
-    }
-
-    m_current_region = *lowest_region;
-    if (auto start_of_region = kapi::memory::frame::containing(kapi::memory::physical_address{m_current_region->base});
-        start_of_region > m_next_frame)
-    {
-      m_next_frame = start_of_region;
-    }
-  }
-
-  auto region_allocator::find_next_frame() -> std::optional<kapi::memory::frame>
-  {
-    if (!m_current_region || m_next_frame > last_frame(*m_current_region))
-    {
-      choose_next_region();
-      if (!m_current_region)
-      {
-        return std::nullopt;
-      }
-    }
-
-    if (falls_within(m_next_frame, m_kernel_start, m_kernel_end))
-    {
-      m_next_frame = m_kernel_end + 1;
-    }
-
-    if (falls_within(m_next_frame, m_multiboot_start, m_multiboot_end))
-    {
-      m_next_frame = m_multiboot_end + 1;
-    }
-
-    if (falls_within(m_next_frame, m_kernel_start, m_kernel_end))
-    {
-      m_next_frame = m_kernel_end + 1;
-    }
-
-    if (m_next_frame > last_frame(*m_current_region))
-    {
-      choose_next_region();
-    }
-
-    return m_current_region.transform([this](auto) -> auto { return m_next_frame; });
-  }
-
-  auto region_allocator::allocate_many(std::size_t count) noexcept
-      -> std::optional<std::pair<kapi::memory::frame, std::size_t>>
-  {
-    while (m_current_region)
-    {
-      auto result = find_next_frame();
-
-      if (result)
-      {
-        auto region_end = last_frame(*m_current_region);
-        if ((region_end.number() - result->number()) >= count)
-        {
-          m_next_frame = m_next_frame + count;
-          return std::make_pair(*result, count);
-        }
-        else
-        {
-          m_next_frame = region_end + 1;
-          choose_next_region();
-        }
-      }
-    }
-
-    return std::nullopt;
-  }
-
-  auto region_allocator::mark_used(kapi::memory::frame frame) -> void
-  {
-    if (frame < m_next_frame)
-    {
-      m_next_frame = frame;
-      find_next_frame();
-    }
-  }
-
-  auto region_allocator::release_many(std::pair<kapi::memory::frame, std::size_t>) -> void {}
-
-  auto region_allocator::next_free_frame() noexcept -> std::optional<kapi::memory::frame>
-  {
-    return find_next_frame();
-  }
-
-}  // namespace arch::memory
diff --git a/arch/x86_64/src/vga/text/buffer.cpp b/arch/x86_64/src/vga/text/buffer.cpp
deleted file mode 100644
index 7112573..0000000
--- a/arch/x86_64/src/vga/text/buffer.cpp
+++ /dev/null
@@ -1,101 +0,0 @@
-#include "arch/vga/text/buffer.hpp"
-
-#include "arch/vga/text/attribute.hpp"
-
-#include <algorithm>
-#include <bit>
-#include <cstddef>
-#include <span>
-#include <string_view>
-#include <utility>
-
-namespace arch::vga::text
-{
-  buffer::buffer(std::size_t width, std::size_t height, cell * start, std::size_t position)
-      : m_width{width}
-      , m_height{height}
-      , m_buffer{start, m_width * m_height}
-      , m_position{position}
-  {}
-
-  auto buffer::clear() -> void
-  {
-    m_position = 0;
-    std::ranges::fill(m_buffer, std::pair{'\0', static_cast<std::byte>(0x00)});
-  }
-
-  auto buffer::write(std::string_view code_points, attribute attribute) -> void
-  {
-    std::ranges::for_each(code_points, [&](auto code_point) -> void { write(code_point, attribute); });
-  }
-
-  auto buffer::write(char code_point, attribute attribute) -> void
-  {
-    if (m_position + 1 > m_height * m_width)
-    {
-      scroll();
-    }
-
-    if (!handle_special_code_point(code_point, attribute))
-    {
-      do_write(code_point, attribute);
-    }
-  };
-
-  auto buffer::newline() -> void
-  {
-    auto free_glyphs_in_line = m_width - column();
-    m_position += free_glyphs_in_line;
-  }
-
-  auto buffer::scroll(std::size_t nof_lines) -> void
-  {
-    auto scroll_count = std::min(nof_lines, m_height);
-
-    auto scroll_start = m_buffer.begin() + (scroll_count * m_width);
-    std::ranges::move(scroll_start, m_buffer.end(), m_buffer.begin());
-
-    auto clear_start = m_buffer.begin() + (m_height - scroll_count) * m_width;
-    std::ranges::fill(clear_start, m_buffer.end(), cell{});
-
-    m_position = (line() - scroll_count) * m_width;
-  }
-
-  auto buffer::column() const noexcept -> std::ptrdiff_t
-  {
-    return m_position % m_width;
-  }
-
-  auto buffer::line() const noexcept -> std::ptrdiff_t
-  {
-    return m_position / m_width;
-  }
-  auto buffer::handle_special_code_point(char code_point, attribute attribute) -> bool
-  {
-    switch (code_point)
-    {
-      case '\n':
-        newline();
-        return true;
-      case '\r':
-        m_position -= column();
-        return true;
-      case '\t':
-        do_write("  ", attribute);
-        return true;
-      default:
-        return false;
-    }
-  }
-
-  auto buffer::do_write(std::string_view code_points, attribute attribute) -> void
-  {
-    std::ranges::for_each(code_points, [&](auto code_point) -> void { do_write(code_point, attribute); });
-  }
-
-  auto buffer::do_write(char code_point, attribute attribute) -> void
-  {
-    m_buffer[m_position++] = std::pair{code_point, std::bit_cast<std::byte>(attribute)};
-  }
-
-}  // namespace arch::vga::text
diff --git a/arch/x86_64/src/vga/text/device.cpp b/arch/x86_64/src/vga/text/device.cpp
deleted file mode 100644
index dcacd8c..0000000
--- a/arch/x86_64/src/vga/text/device.cpp
+++ /dev/null
@@ -1,60 +0,0 @@
-#include "kapi/cio.hpp"
-
-#include "arch/boot/boot.hpp"
-#include "arch/boot/ld.hpp"
-#include "arch/vga/crtc.hpp"
-#include "arch/vga/text.hpp"
-
-#include <bit>
-#include <cstddef>
-#include <cstdint>
-#include <string_view>
-
-namespace arch::vga::text
-{
-  namespace
-  {
-    constexpr auto default_buffer_address = std::uintptr_t{0xb8000};
-    constexpr auto default_buffer_width = 80z;
-    constexpr auto default_buffer_height = 25z;
-
-    constexpr auto bit_cursor_enabled = 5U;
-  }  // namespace
-
-  device::device()
-      : m_buffer{
-          default_buffer_width, default_buffer_height,
-          std::bit_cast<buffer::cell *>(default_buffer_address + std::bit_cast<std::uintptr_t>(&boot::TEACHOS_VMA)),
-          kapi::boot::bootstrap_information.vga_buffer_index}
-  {
-    clear();
-  }
-
-  auto device::clear() -> void
-  {
-    m_buffer.clear();
-  }
-
-  auto device::cursor(bool enabled) -> void
-  {
-    auto cursor_disable_byte = std::byte{!enabled} << bit_cursor_enabled;
-
-    crtc::address::write(crtc::registers::cursor_start);
-    crtc::data::write(crtc::data::read() | cursor_disable_byte);
-  }
-
-  auto device::write(kapi::cio::output_stream stream, std::string_view text) -> void
-  {
-    auto attributes = [&] -> attribute {
-      switch (stream)
-      {
-        case kapi::cio::output_stream::stderr:
-          return red_on_black;
-        default:
-          return green_on_black;
-      }
-    }();
-    m_buffer.write(text, attributes);
-  }
-
-}  // namespace arch::vga::text