diff options
Diffstat (limited to 'source')
21 files changed, 0 insertions, 1314 deletions
diff --git a/source/.clang-format b/source/.clang-format deleted file mode 100644 index d4da962..0000000 --- a/source/.clang-format +++ /dev/null @@ -1,77 +0,0 @@ ---- -AccessModifierOffset: '-2' -AlignAfterOpenBracket: Align -AlignConsecutiveAssignments: 'false' -AlignConsecutiveDeclarations: 'false' -AlignEscapedNewlines: Left -AlignOperands: 'true' -AlignTrailingComments: 'true' -AllowAllParametersOfDeclarationOnNextLine: 'true' -AllowShortBlocksOnASingleLine: 'false' -AllowShortCaseLabelsOnASingleLine: 'false' -AllowShortFunctionsOnASingleLine: All -AllowShortIfStatementsOnASingleLine: 'false' -AllowShortLoopsOnASingleLine: 'false' -AlwaysBreakAfterDefinitionReturnType: None -AlwaysBreakAfterReturnType: None -AlwaysBreakTemplateDeclarations: 'true' -BinPackArguments: 'true' -BinPackParameters: 'true' -BreakBeforeBraces: Custom -BraceWrapping: - AfterClass: 'true' - AfterControlStatement: 'true' - AfterEnum: 'true' - AfterFunction: 'true' - AfterNamespace: 'true' - AfterStruct: 'true' - AfterUnion: 'true' - AfterExternBlock: 'true' - BeforeCatch: 'true' - BeforeElse: 'true' - IndentBraces: 'false' -BreakBeforeInheritanceComma: 'false' -BreakConstructorInitializers: BeforeComma -BreakStringLiterals: 'true' -ColumnLimit: '120' -CompactNamespaces: 'false' -Cpp11BracedListStyle: 'true' -DerivePointerAlignment: 'false' -FixNamespaceComments: 'true' -IncludeBlocks: Regroup -IncludeCategories: - # Local Headers - - Regex: '"(.*/?)+/.+\.hpp"' - Priority: 100 - # STL Headers - - Regex: '<[[:alnum:]._]+(?!\.(h|hpp))>' - Priority: 400 - # C Library Headers - - Regex: '<([[:alnum:]._]/*)+\.h>' - Priority: 300 -IndentCaseLabels: 'true' -IndentPPDirectives: None -IndentWidth: '2' -KeepEmptyLinesAtTheStartOfBlocks: 'false' -Language: Cpp -MaxEmptyLinesToKeep: '1' -NamespaceIndentation: All -PointerAlignment: Middle -ReflowComments: 'true' -SortIncludes: 'true' -SortUsingDeclarations: 'true' -SpaceAfterCStyleCast: 'false' -SpaceAfterTemplateKeyword: 'false' -SpaceBeforeAssignmentOperators: 'true' -SpaceBeforeParens: ControlStatements -SpaceInEmptyParentheses: 'false' -SpacesBeforeTrailingComments: '2' -SpacesInAngles: 'false' -SpacesInContainerLiterals: 'false' -SpacesInCStyleCastParentheses: 'false' -SpacesInParentheses: 'false' -SpacesInSquareBrackets: 'false' -Standard: Cpp11 -TabWidth: '2' -UseTab: Never -... diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt deleted file mode 100644 index beb0c07..0000000 --- a/source/CMakeLists.txt +++ /dev/null @@ -1,115 +0,0 @@ -cmake_minimum_required(VERSION "3.27") - -project("kernel" - DESCRIPTION "${TEACHOS_DESCRIPTION}" - HOMEPAGE_URL "${TEACHOS_HOMEPAGE_URL}" - VERSION "${TEACHOS_VERSION}" - LANGUAGES ASM C CXX -) - -#[============================================================================[ -# Global Build System Configuration -#]============================================================================] - -set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/bin") -set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/lib") -set(CMAKE_INTERPROCEDURAL_OPTIMIZATION YES) - -#[============================================================================[ -# Documentation -#]============================================================================] - -find_package("Doxygen") - -set(DOXYGEN_GENERATE_HTML NO) -set(DOXYGEN_GENERATE_XML YES) -set(DOXYGEN_EXCLUDE_PATTERNS "*.cpp") -set(DOXYGEN_OUTPUT_DIRECTORY "doxygen") -set(DOXYGEN_QUIET YES) - -file(GLOB_RECURSE DOXYGEN_SOURCES CONFIGURE_DEPENDS "*.hpp") - -message(STATUS "${SPHINX_SOURCES}") - -doxygen_add_docs("docs_xml" - ${DOXYGEN_SOURCES} - ALL - USE_STAMP_FILE - COMMENT "Generating developer documentation sources" -) - -set_target_properties("docs_xml" PROPERTIES - ADDITIONAL_CLEAN_FILES - "${PROJECT_BINARY_DIR}/doxygen" -) - -file(GLOB_RECURSE SPHINX_SOURCES CONFIGURE_DEPENDS "../docs/**.rst") - -add_custom_target("docs" ALL - COMMAND "${SPHINX_BUILD_EXE}" - "../docs" - "docs" - "-q" - DEPENDS "docs_xml" - SOURCES ${SPHINX_SOURCES} - COMMENT "Generating developer documentation html" -) - -set_target_properties("docs" PROPERTIES - ADDITIONAL_CLEAN_FILES - "${PROJECT_BINARY_DIR}/docs" -) - -#[============================================================================[ -# Global Compiler Configuration -#]============================================================================] - -add_compile_options( - "$<$<CXX_COMPILER_ID:GNU>:-Wall>" - "$<$<CXX_COMPILER_ID:GNU>:-Wextra>" - "$<$<CXX_COMPILER_ID:GNU>:-Werror>" - "$<$<CXX_COMPILER_ID:GNU>:-pedantic-errors>" -) - -#[============================================================================[ -# Global Directories -#]============================================================================] - -include_directories( - "include" - "arch/${CMAKE_SYSTEM_PROCESSOR}/include" -) - -#[============================================================================[ -# The Bootstrap Library -#]============================================================================] - -add_library("_boot" OBJECT) -add_library("teachos::boot" ALIAS "_boot") - -#[============================================================================[ -# The Video Library -#]============================================================================] - -add_library("_video" OBJECT) -add_library("teachos::video" ALIAS "_video") - -#[============================================================================[ -# The Kernel -#]============================================================================] - -add_executable("_kernel" - "src/kernel/main.cpp" -) -add_executable("teachos::kernel" ALIAS "_kernel") - -target_link_libraries("_kernel" PRIVATE - "teachos::boot" - "teachos::video" -) - -#[============================================================================[ -# Platform Specific Components -#]============================================================================] - -add_subdirectory("arch/${CMAKE_SYSTEM_PROCESSOR}") diff --git a/source/arch/x86_64/CMakeLists.txt b/source/arch/x86_64/CMakeLists.txt deleted file mode 100644 index 6ff1332..0000000 --- a/source/arch/x86_64/CMakeLists.txt +++ /dev/null @@ -1,64 +0,0 @@ -#[============================================================================[ -# The Kernel Library -#]============================================================================] - -set(TEACHOS_KERNEL_LINKER_SCRIPT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/kernel.ld") -mark_as_advanced(TEACHOS_KERNEL_LINKER_SCRIPT) - -target_sources("_kernel" PRIVATE - "src/kernel/main.cpp" -) - -target_link_options("_kernel" PRIVATE - "-T${TEACHOS_KERNEL_LINKER_SCRIPT}" -) - -set_target_properties("_kernel" PROPERTIES - LINK_DEPENDS "${TEACHOS_KERNEL_LINKER_SCRIPT}" -) - -#[============================================================================[ -# The Bootstrap Library -#]============================================================================] - -target_sources("_boot" PRIVATE - "src/boot/boot.s" - "src/boot/crti.s" - "src/boot/crtn.s" - "src/boot/multiboot.s" -) - -#[============================================================================[ -# The Video Library -#]============================================================================] - -target_sources("_video" PRIVATE - "src/video/vga/text.cpp" -) - -#[============================================================================[ -# The Bootable ISO Image -#]============================================================================] - -find_package("grub-mkrescue") - -if(grub-mkrescue_FOUND) - file(GENERATE - OUTPUT "isofs/boot/grub/grub.cfg" - INPUT "support/grub.cfg.in" - ) - - add_custom_target("bootable-iso" - COMMAND "${GRUB_MKRESCUE_EXE}" - "-o" - "${PROJECT_BINARY_DIR}/teachos-$<CONFIGURATION>.iso" - "${CMAKE_CURRENT_BINARY_DIR}/isofs" - "$<TARGET_FILE:teachos::kernel>" - "2>/dev/null" - DEPENDS - "$<TARGET_FILE:teachos::kernel>" - "isofs/boot/grub/grub.cfg" - BYPRODUCTS "${PROJECT_BINARY_DIR}/teachos-$<CONFIGURATION>.iso" - COMMENT "Creating bootable ISO image" - ) -endif() diff --git a/source/arch/x86_64/include/arch/boot/pointers.hpp b/source/arch/x86_64/include/arch/boot/pointers.hpp deleted file mode 100644 index dcd14fe..0000000 --- a/source/arch/x86_64/include/arch/boot/pointers.hpp +++ /dev/null @@ -1,11 +0,0 @@ -#ifndef TEACHOS_ARCH_X86_64_BOOT_POINTERS_HPP -#define TEACHOS_ARCH_X86_64_BOOT_POINTERS_HPP - -#include <cstddef> - -namespace teachos::arch::boot -{ - extern "C" std::byte const multiboot_information_pointer; -} // namespace teachos::arch::boot - -#endif
\ No newline at end of file diff --git a/source/arch/x86_64/include/arch/io/port_io.hpp b/source/arch/x86_64/include/arch/io/port_io.hpp deleted file mode 100644 index 5b61f90..0000000 --- a/source/arch/x86_64/include/arch/io/port_io.hpp +++ /dev/null @@ -1,134 +0,0 @@ -#ifndef TEACHOS_ARCH_X86_64_IO_PORT_IO_HPP -#define TEACHOS_ARCH_X86_64_IO_PORT_IO_HPP - -#include <concepts> -#include <cstddef> -#include <cstdint> -#include <type_traits> - -namespace teachos::arch::io -{ - - /** - * @brief An I/O port of a given size at a given address. - * - * @tparam Address The address (port number) of the I/O port. - * @tparam Size The size (in bytes) of the I/O port. - */ - template<std::uint16_t Address, std::size_t Size> - struct port - { - static_assert(Size == 1 || Size == 2 || Size == 4, "A port must be either 1, 2, or 4 bytes in size"); - - /** - * @brief The type of data available for reading and writing through this port. - */ - using io_type = - std::conditional_t<Size == 1, std::byte, std::conditional_t<Size == 2, std::uint16_t, std::uint32_t>>; - - /** - * @brief Write a byte to the I/O port. - * - * @param data The data to write to the I/O port. - */ - auto static write(io_type data) -> void - requires(Size == 1) - { - asm volatile("mov %[port], %%dx\n" - "mov %[data], %%al\n" - "out %%al, %%dx\n" - : - : [port] "i"(Address), [data] "im"(data) - : "dx", "al"); - } - - /** - * @brief Write a word to the I/O port. - * - * @param data The data to write to the I/O port. - */ - auto static write(io_type data) -> void - requires(Size == 2) - { - asm volatile("mov %[port], %%dx\n" - "mov %[data], %%ax\n" - "out %%ax, %%dx\n" - : - : [port] "i"(Address), [data] "im"(data) - : "dx", "ax"); - } - - /** - * @brief Write a double-word to the I/O port. - * - * @param data The data to write to the I/O port. - */ - auto static write(io_type data) -> void - requires(Size == 4) - { - asm volatile("mov %[port], %%dx\n" - "mov %[data], %%eax\n" - "out %%eax, %%dx\n" - : - : [port] "i"(Address), [data] "im"(data) - : "dx", "eax"); - } - - /** - * @brief Read a byte from the I/O port. - * - * @return The data read from the I/O port. - */ - auto static read() -> io_type - requires(Size == 1) - { - auto data = io_type{}; - asm volatile("mov %[port], %%dx\n" - "in %%dx, %%al\n" - "mov %%al, %[data]\n" - : [data] "=m"(data) - : [port] "i"(Address) - : "dx", "al"); - return data; - } - - /** - * @brief Read a word from the I/O port. - * - * @return The data read from the I/O port. - */ - auto static read() -> io_type - requires(Size == 2) - { - auto data = io_type{}; - asm volatile("mov %[port], %%dx\n" - "in %%dx, %%ax\n" - "mov %%ax, %[data]\n" - : [data] "=m"(data) - : [port] "i"(Address) - : "dx", "ax"); - return data; - } - - /** - * @brief Read a double-word from the I/O port. - * - * @return The data read from the I/O port. - */ - auto static read() -> io_type - requires(Size == 4) - { - auto data = io_type{}; - asm volatile("mov %[port], %%dx\n" - "in %%dx, %%eax\n" - "mov %%eax, %[data]\n" - : [data] "=m"(data) - : [port] "i"(Address) - : "dx", "eax"); - return data; - } - }; - -} // namespace teachos::arch::io - -#endif
\ No newline at end of file diff --git a/source/arch/x86_64/include/arch/kernel/main.hpp b/source/arch/x86_64/include/arch/kernel/main.hpp deleted file mode 100644 index 6961594..0000000 --- a/source/arch/x86_64/include/arch/kernel/main.hpp +++ /dev/null @@ -1,11 +0,0 @@ -#ifndef TEACHOS_ARCH_X86_64_KERNEL_MAIN_HPP -#define TEACHOS_ARCH_X86_64_KERNEL_MAIN_HPP - -#include <cstddef> - -namespace teachos::arch::kernel -{ - auto main() -> void; -} - -#endif
\ No newline at end of file diff --git a/source/arch/x86_64/include/arch/video/vga/io.hpp b/source/arch/x86_64/include/arch/video/vga/io.hpp deleted file mode 100644 index 9226c5c..0000000 --- a/source/arch/x86_64/include/arch/video/vga/io.hpp +++ /dev/null @@ -1,41 +0,0 @@ -#ifndef TEACHOS_ARCH_X86_64_VIDEO_VGA_IO_HPP -#define TEACHOS_ARCH_X86_64_VIDEO_VGA_IO_HPP - -#include "arch/io/port_io.hpp" - -#include <cstddef> - -namespace teachos::arch::video::vga -{ - - namespace crtc - { - - /** - * @brief The address port of the CRT Controller - */ - using address_port = arch::io::port<0x3d4, 1>; - - /** - * @brief The data port of the CRT Controller - */ - using data_port = arch::io::port<0x3d5, 1>; - - namespace registers - { - /** - * @brief The address of the Cursor Start register of the CRTC - */ - [[maybe_unused]] auto constexpr cursor_start = std::byte{0x0a}; - - /** - * @brief The address of the Cursor End register of the CRTC - */ - [[maybe_unused]] auto constexpr curser_end = std::byte{0x0b}; - } // namespace registers - - }; // namespace crtc - -} // namespace teachos::arch::video::vga - -#endif
\ No newline at end of file diff --git a/source/arch/x86_64/include/arch/video/vga/text.hpp b/source/arch/x86_64/include/arch/video/vga/text.hpp deleted file mode 100644 index 1e584d6..0000000 --- a/source/arch/x86_64/include/arch/video/vga/text.hpp +++ /dev/null @@ -1,113 +0,0 @@ -#ifndef TEACHOS_ARCH_X86_64_VIDEO_VGA_TEXT_HPP -#define TEACHOS_ARCH_X86_64_VIDEO_VGA_TEXT_HPP - -#include <cstdint> -#include <string_view> - -namespace teachos::arch::video::vga::text -{ - /** - * @brief The colors available in the standard VGA text mode. - */ - enum struct color : std::uint8_t - { - black, /**< Equivalent to HTML color \#000000 */ - blue, /**< Equivalent to HTML color \#0000AA */ - green, /**< Equivalent to HTML color \#00AA00 */ - cyan, /**< Equivalent to HTML color \#00AAAA */ - red, /**< Equivalent to HTML color \#AA0000 */ - purple, /**< Equivalent to HTML color \#AA00AA */ - brown, /**< Equivalent to HTML color \#AA5500 */ - gray, /**< Equivalent to HTML color \#AAAAAA */ - }; - - /** - * @brief The foreground color modification flag. - */ - enum struct foreground_flag : bool - { - none, /**< Apply no flag e.g., keep color as is. */ - intense, /**< Make the color more intense (usually brighter). */ - }; - - /** - * @brief The background color modification flag. - */ - enum struct background_flag : bool - { - none, /**< Apply no flag e.g., keep color as is. */ - blink_or_bright, /**< Make the cell blink or more intense, dependent on the VGA configuration */ - }; - - /** - * @brief The VGA text mode attribute. - * - * In the text mode of VGA, every code point being presented is followed by an attribute description. This allows for - * the modification of how the relevant "cell" is presented. - * - * @see vga::text::foreground_flag - * @see vga::text::background_flag - */ - struct attribute - { - color foreground_color : 3; /**< The foreground color of the cell, e.g. the color of the code point.*/ - enum foreground_flag foreground_flag : 1; /**< The foreground color modification flag of the cell.*/ - color bacground_color : 3; /**< The background color of the cell.*/ - enum background_flag background_flag : 1; /**< The background color modification flag of the cell.*/ - }; - - static_assert(sizeof(attribute) == 1, "The VGA text mode attribute must fit inside a single byte."); - - /** - * @brief Commonly used VGA text mode attributes - */ - namespace common_attributes - { - /** - * @brief Make the affected cell display with a gray foreground and black background. - */ - [[maybe_unused]] auto constexpr gray_on_black = - attribute{color::gray, foreground_flag::none, color::black, background_flag::none}; - - /** - * @brief Make the affected cell display with a green foreground and black background. - */ - [[maybe_unused]] auto constexpr green_on_black = - attribute{color::green, foreground_flag::none, color::black, background_flag::none}; - - /** - * @brief Make the affected cell display with a white (gray + intense) foreground and red background. - */ - [[maybe_unused]] auto constexpr white_on_red = - attribute{color::gray, foreground_flag::intense, color::red, background_flag::none}; - } // namespace common_attributes - - /** - * @brief Clear the VGA text mode buffer. - * - * @note This function also resets the text mode buffer pointer. - * - * @param attribute The attribute to "clear" the screen with. - */ - auto clear(attribute attribute = common_attributes::gray_on_black) -> void; - - /** - * @brief Enable or disable the VGA text mode cursor. - * - * @param enabled Whether or not to enable the cursors. - */ - auto cursor(bool enabled) -> void; - - /** - * @brief Write a string of code points to the VGA text buffer. - * - * @note This function also updates the text mode buffer pointer. - * - * @param code_points A string of (8-bit) code points to write to the VGA text mode buffer. - * @param attribute The attribute to apply to the written sequence of code points. - * @see vga::text::attribute - */ - auto write(std::string_view code_points, attribute attribute) -> void; -} // namespace teachos::arch::video::vga::text - -#endif
\ No newline at end of file diff --git a/source/arch/x86_64/scripts/kernel.ld b/source/arch/x86_64/scripts/kernel.ld deleted file mode 100644 index 765a432..0000000 --- a/source/arch/x86_64/scripts/kernel.ld +++ /dev/null @@ -1,139 +0,0 @@ -ENTRY(_start) - -/***************************************************************************** - * Virtual and linear start addresses of the TeachOS kernel - *****************************************************************************/ -TEACHOS_HIGH = -2048M; -TEACHOS_LOW = 1M; - -PHDRS { - boot_rodata PT_LOAD FLAGS(4); - boot_text PT_LOAD FLAGS(5); - boot_data PT_LOAD FLAGS(6); - - text PT_LOAD FLAGS(5); - data PT_LOAD FLAGS(6); - rodata PT_LOAD FLAGS(4); -} - -SECTIONS -{ - /*************************************************************************** - * Load the bootstrap code into low memory. We need to be accessible in - * 32-Bit mode, so we want to live down low, but we need to leave the 1MiB - * hole open since some BIOS functionality resides below it. - ***************************************************************************/ - . = TEACHOS_LOW; - - /*************************************************************************** - * We want to be able to be able to access all memory (linear and virtual) - * during bootstrapping and operation. To achieve this, we define some - * symbols at the beginning. - ***************************************************************************/ - _start_linear = .; - _start_virtual = . + TEACHOS_HIGH; - - /*************************************************************************** - * The bootstrapping infratructure goes first. We first place the read-only - * data, followed by our code, initialized mutable data, and finally our - * uninitialized mutable data. - ***************************************************************************/ - .boot_rodata : - { - KEEP(*(.boot_mbh)) - *(.boot_rodata) - } :boot_rodata - - .boot_text : - { - *(.boot_text) - } :boot_text - - .boot_data : - { - *(.boot_data) - } :boot_data - - .boot_bss : - { - *(.boot_bss) - *(.boot_stack) - } - - /*************************************************************************** - * Now it is time to load the 64-bit kernel code. We virtually load it into - * the upper 2GiB, while adjusting the linear load address appropriately. We - * also make sure to align the loaded data onto a page boundary. - ***************************************************************************/ - . = ALIGN(4K); - . += TEACHOS_HIGH; - - .init ALIGN(4K) : AT(ADDR (.init) - TEACHOS_HIGH) - { - /* - * Make sure that the crt code is wrapped around the compiler generated - * initialization code. - */ - KEEP(*crti.s.obj(.init)) - KEEP(*(EXCLUDE_FILE (*crti.s.obj *crtn.s.obj) .init)) - KEEP(*crtn.s.obj(.init)) - } :text - - .fini ALIGN(4K) : AT(ADDR (.fini) - TEACHOS_HIGH) - { - /* - * Make sure that the crt code is wrapped around the compiler generated - * finalizer code. - */ - KEEP(*crti.s.obj(.fini)) - KEEP(*(EXCLUDE_FILE (*crti.s.obj *crtn.s.obj) .fini)) - KEEP(*crtn.s.obj(.fini)) - } - - .text ALIGN(4K) : AT(ADDR (.text) - TEACHOS_HIGH) - { - *(.text*) - } - - .rodata ALIGN(4K) : AT (ADDR (.rodata) - TEACHOS_HIGH) - { - *(.rodata) - *(.rodata.*) - } :rodata - - .ctors ALIGN(4K) : AT (ADDR (.ctors) - TEACHOS_HIGH) - { - KEEP(*crtbegin.o(.ctors)) - KEEP(*(EXCLUDE_FILE (*crtend.o) .ctors)) - KEEP(*(SORT(.ctors.*))) - KEEP(*crtend.o(.ctors)) - } :data - - .dtors ALIGN(4K) : AT (ADDR (.dtors) - TEACHOS_HIGH) - { - KEEP(*crtbegin.o(.dtors)) - KEEP(*(EXCLUDE_FILE (*crtend.o) .dtors)) - KEEP(*(SORT(.dtors.*))) - KEEP(*crtend.o(.dtors)) - } - - .data ALIGN(4K) : AT (ADDR (.data) - TEACHOS_HIGH) - { - *(.data*) - } - - .bss ALIGN(4K) : AT (ADDR (.bss) - TEACHOS_HIGH) - { - *(COMMON) - *(.bss*) - } - - /*************************************************************************** - * In accordance with the symbol definitions at the start, we generate some - * symbols to mark the end of our loaded image. - ***************************************************************************/ - _end_virtual = ADDR(.bss) + SIZEOF(.bss); - _end_linear = _end_virtual - TEACHOS_HIGH; - - /DISCARD/ : { *(.comment) } -} diff --git a/source/arch/x86_64/src/boot/boot.s b/source/arch/x86_64/src/boot/boot.s deleted file mode 100644 index 7b4e193..0000000 --- a/source/arch/x86_64/src/boot/boot.s +++ /dev/null @@ -1,370 +0,0 @@ -.extern _end_physical -.extern _init -.extern kernel_main - - -/** - * Uninitialized data for the bootstrapping process. - */ -.section .boot_bss, "aw", @nobits -.align 4096 - -/** - * Reserve space for the page maps we are going to used during startup. - * - * Note: We are going to use large pages to make the initial mapping code - * simpler. - * - * We need: - * - A single PML 4 (since we will only use 4-level paging) - * - 2 PML 3s (since we need to map high (-2GiB) and low (1+MiB) memory) - * - 2 PML 2s (since we need to map high (-2GiB) and low (1+MiB) memory) - */ - -.global page_map_level_4 -page_map_level_4: .skip 512 * 8 - -.global page_map_level_3_low -page_map_level_3_low: .skip 512 * 8 -.global page_map_level_3_high -page_map_level_3_high: .skip 512 * 8 - -.global page_map_level_2_low -page_map_level_2_low: .skip 512 * 8 -.global page_map_level_2_high -page_map_level_2_high: .skip 512 * 8 - -/** - * Reserve some space for the Multiboot 2 information pointer. - */ -.global multiboot_information_pointer -multiboot_information_pointer: .skip 4 - -/** - * Stack space for the bootstrapping process. - * - * Note: We are going to reserve 1 MiB for now. If/when the kernel requires - * more space to run, it will have to relocate the stack. - */ -.section .boot_stack, "aw", @nobits -.align 16 - -stack_bottom: .skip 1 << 20 -stack_top: - -/** - * Constants for the bootstrapping process. - */ -.section .boot_rodata, "a", @progbits - -/** - * A valid Global Descriptor Table is still required in long mode. However, we - * only need a single entry for the "code segment", so we will setup a single - * segment table below. - * - * Bit 43: "E" in the access byte => mark the segment as executable. - * Bit 44: "S" in the access byte => mark the segment as code or data. - * Bit 47: "P" in the access byte => mark the segment as being present. - * Bit 53: "L" in the flags byte => mark the segment as being for long mode - */ - -global_descriptor_table: .quad 0 -global_descriptor_table_code = . - global_descriptor_table -.quad (1<<43) | (1<<44) | (1<<47) | (1<<53) - -/** - * We also need a pointer that we can load into the GDTR. - * - * The pointer consists of a word describing the size of the table minus 1 and - * the pointer to the actual table. - */ -global_descriptor_table_pointer: -.word . - global_descriptor_table - 1 -.quad global_descriptor_table - -/** - * We are going to print some messages in case we panic during boot, so we are - * going to store them here as well - */ -message_prefix_panic: -.string "TeachOS 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." -mesage_long_mode_not_supported: -.string "Long mode is not supported by this platform." - -/** - * Mutable data for the bootstrapping process. - */ -.section .boot_data, "aw", @progbits - -/** - * We need a pointer to our current position in the VGA text buffer. - */ -.global vga_buffer_pointer -vga_buffer_pointer: .long 0xb8000 - -/** - * Code for the bootstrapping process. - */ -.section .boot_text, "ax", @progbits -.align 16 -.code32 - -/** - * Print a given panic message and then halt the machine. - * - * Parameters: - * - [stack - 0] message: the message to print - */ -_panic: - push %ebp - mov %esp, %ebp - - push message_prefix_panic - push $0x4f - call _print - add $8, %esp - - push 8(%ebp) - push 0x4f - call _print - add $8, %esp - - hlt - -/** - * Print a message via the VGA buffer. - * - * Parameters: - * - [stack - 4] message: the message to print - * - [stack - 0] color: the color of the message - */ -_print: - push %ebp - mov %esp, %ebp - - push %ebx - push %esi - mov 8(%ebp), %eax - mov 12(%ebp), %ebx - mov $0, %ecx - mov (vga_buffer_pointer), %esi - -.Lprint_loop: - mov (%ebx, %ecx), %dl - test %dl, %dl - je .Lupdate_vga_buffer_address - mov %dl, (%esi, %ecx, 2) - mov %al, 1(%esi, %ecx, 2) - inc %ecx - jmp .Lprint_loop - -.Lupdate_vga_buffer_address: - shl $1, %ecx - add %ecx, (vga_buffer_pointer) - -.Lprint_end: - pop %esi - pop %ebx - mov %ebp, %esp - pop %ebp - ret - -/** - * This is our entry point after being loaded by the bootloader. - * - * Having this in assembly makes it easier for us to keep things together. - */ -.global _start -_start: - mov $stack_top, %esp - mov %esp, %ebp - - call assert_loaded_by_multiboot2_loader - call assert_cpuid_instruction_is_supported - call assert_cpu_supports_long_mode - call prepare_page_maps - call enable_paging - call enable_sse - - lgdt (global_descriptor_table_pointer) - jmp $global_descriptor_table_code,$_transition_to_long_mode - - hlt - -/** - * Assert that the CPU supports going into long mode. - */ -assert_cpu_supports_long_mode: - mov $0x80000000, %eax - cpuid - cmp $0x80000001, %eax - jb .Llong_mode_assertion_failed - - mov $0x80000001, %eax |