feat: working bootloader and basic kernel (just dyes screen green)
This commit is contained in:
karina
@@ -24,6 +24,7 @@ add_library(posix_uefi_lib OBJECT ${POSIX_UEFI_SOURCES})
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target_compile_options(posix_uefi_lib PRIVATE ${UEFI_COMPILE_OPTIONS})
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target_include_directories(posix_uefi_lib PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/Source/uefi)
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add_executable(BOOTAA64 Source/main.c)
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target_compile_options(BOOTAA64 PRIVATE ${UEFI_COMPILE_OPTIONS})
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+141
-4
@@ -1,7 +1,144 @@
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#include "uefi/uefi.h" // IWYU pragma: keep
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#include "../../Common/bootinfo.h"
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int main() {
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printf("Meow!\n");
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while (1) __asm__ ("wfi");
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return 0;
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void print(wchar_t* msg) {
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ST->ConOut->OutputString(ST->ConOut, msg);
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}
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efi_status_t die() {
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while(1) __asm__ volatile("wfi");
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return EFI_ABORTED;
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}
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int compare_guid(efi_guid_t* a, efi_guid_t* b) {
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uint8_t* p1 = (uint8_t*)a;
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uint8_t* p2 = (uint8_t*)b;
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for (int i = 0; i < 16; i++) {
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if (p1[i] != p2[i]) return 0;
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}
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return 1;
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}
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int main()
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{
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efi_gop_t* gop = NULL;
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efi_guid_t gop_guid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
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ST->BootServices->LocateProtocol(&gop_guid, 0, (void**)&gop);
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efi_guid_t dtb_guid = {0xb1b621d5, 0xf19c, 0x41a5, {0x83, 0x0b, 0xd9, 0x15, 0x2c, 0x69, 0xaa, 0xe0}};
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void* dtbAddress = NULL;
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for (uintn_t i = 0; i < ST->NumberOfTableEntries; i++) {
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if (compare_guid(&ST->ConfigurationTable[i].VendorGuid, &dtb_guid)) {
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dtbAddress = ST->ConfigurationTable[i].VendorTable;
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break;
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}
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}
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if (!dtbAddress) {
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print(L"Failed to find DTB!\r\n");
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return die();
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}
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efi_loaded_image_protocol_t* loaded_image;
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efi_guid_t lip_guid = EFI_LOADED_IMAGE_PROTOCOL_GUID;
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gBS->HandleProtocol(IM, &lip_guid, (void**)&loaded_image);
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efi_simple_file_system_protocol_t* fs;
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efi_guid_t sfsp_guid = EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID;
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gBS->HandleProtocol(loaded_image->DeviceHandle, &sfsp_guid, (void**)&fs);
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efi_file_handle_t* root;
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fs->OpenVolume(fs, &root);
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efi_file_handle_t* kernel_file;
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uintn_t kinfo_size = 0;
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efi_file_info_t* kfile_info = NULL;
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efi_guid_t fi_guid = EFI_FILE_INFO_GUID;
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efi_status_t status = root->Open(root, &kernel_file, L"ksOSKernel.bin", EFI_FILE_MODE_READ, 0);
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if (EFI_ERROR(status)) {
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print(L"Cant find ksOSKernel.bin\r\n");
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return die();
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}
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status = kernel_file->GetInfo(kernel_file, &fi_guid, &kinfo_size, NULL);
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if (status == EFI_BUFFER_TOO_SMALL) {
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gBS->AllocatePool(EfiLoaderData, kinfo_size, (void**)&kfile_info);
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status = kernel_file->GetInfo(kernel_file, &fi_guid, &kinfo_size, kfile_info);
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}
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uint64_t kernel_size = kfile_info->FileSize;
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uintn_t kernel_size_read = (uintn_t)kernel_size;
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uintn_t kernel_pages = (kernel_size + 0xFFF) / 0x1000;
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efi_physical_address_t kernel_addr = 0;
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status = gBS->AllocatePages(AllocateAnyPages, EfiLoaderData, kernel_pages, &kernel_addr);
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if (EFI_ERROR(status)) {
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print(L"Failed to allocate ANY memory for kernel!\r\n");
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return die();
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}
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kernel_file->Read(kernel_file, &kernel_size_read, (void*)kernel_addr); \
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printf("Kernel loaded at %p\r\n", (void*)kernel_addr);
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Bootinfo* bootInfo = (Bootinfo*)malloc(sizeof(Bootinfo));
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bootInfo->magic = BOOTINFO_MAGIC;
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bootInfo->kernelInfo.kernelAddress = (void*)kernel_addr;
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bootInfo->kernelInfo.kernelSize = kernel_size;
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bootInfo->framebuffer.base = (BIUInt32*)gop->Mode->FrameBufferBase;
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bootInfo->framebuffer.baseSize = gop->Mode->FrameBufferSize;
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bootInfo->framebuffer.height = gop->Mode->Information->VerticalResolution;
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bootInfo->framebuffer.width = gop->Mode->Information->HorizontalResolution;
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bootInfo->framebuffer.pitch = gop->Mode->Information->PixelsPerScanLine;
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bootInfo->dtb = dtbAddress;
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printf("DTB located at: %p\r\n", (void*)dtbAddress);
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uintn_t map_size = 0;
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efi_memory_descriptor_t *map = NULL;
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uintn_t map_key;
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uintn_t desc_size;
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uint32_t desc_version;
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print(L"Almost ready to jump :D. Working with memory map\r\n");
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gBS->GetMemoryMap(&map_size, NULL, &map_key, &desc_size, &desc_version);
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map_size += 4096;
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// woah letsgoo
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status = gBS->AllocatePool(EfiLoaderData, map_size, (void**)&map);
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if (EFI_ERROR(status)) {
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print(L"Failed to allocate pool\r\n");
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}
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do {
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status = gBS->GetMemoryMap(&map_size, map, &map_key, &desc_size, &desc_version);
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if (EFI_ERROR(status)) {
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break;
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}
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bootInfo->memoryMap.descriptorSize = desc_size;
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bootInfo->memoryMap.descriptorVersion = desc_version;
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bootInfo->memoryMap.mapSize = map_size;
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bootInfo->memoryMap.mapKey = map_key;
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bootInfo->memoryMap.map = map;
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status = gBS->ExitBootServices(IM, map_key);
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if (status == EFI_SUCCESS) {
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break; // FUCK OFF;
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}
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map_size += 2 * desc_size;
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} while (EFI_ERROR(status));
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typedef void (__attribute__((sysv_abi)) *kentry)(Bootinfo*);
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kentry kmain = (kentry)kernel_addr;
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kmain(bootInfo); // yay! :D
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return EFI_SUCCESS;
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}
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+5
-5
@@ -1,14 +1,14 @@
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BUILD_DIR := env_var_or_default("BUILD_DIR", justfile_directory() + "/.build")
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TEMP_DIR := env_var_or_default("TEMP_DIR", BUILD_DIR + "/temp")
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build:
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cmake -B {{TEMP_DIR}}/bootloader -S . \
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cmake -B {{TEMP_DIR}}/Bootloader -S . \
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-DCMAKE_TOOLCHAIN_FILE=Source/cmake/aarch64-uefi.cmake \
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-DCMAKE_BUILD_TYPE=Release
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cmake --build {{TEMP_DIR}}/bootloader
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cmake --build {{TEMP_DIR}}/Bootloader
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cp {{TEMP_DIR}}/bootloader/efi_bin/BOOTAA64.EFI {{BUILD_DIR}}/bootloader/BOOTAA64.EFI
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@echo "✅ Bootloader ready at: {{BUILD_DIR}}/bootloader/BOOTAA64.EFI"
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cp {{TEMP_DIR}}/Bootloader/efi_bin/BOOTAA64.EFI {{BUILD_DIR}}/Bootloader/BOOTAA64.EFI
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@echo "✅ Bootloader ready at: {{BUILD_DIR}}/Bootloader/BOOTAA64.EFI"
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clean:
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rm -rf {{TEMP_DIR}}/bootloader
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rm -rf {{TEMP_DIR}}/Bootloader
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@@ -0,0 +1,35 @@
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#pragma once
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typedef unsigned int BIUInt32;
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typedef unsigned long long BIUInt64;
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typedef struct {
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BIUInt32* base;
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BIUInt64 baseSize;
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BIUInt64 width;
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BIUInt64 height;
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BIUInt64 pitch;
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} BIFramebuffer;
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typedef struct {
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void* map;
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BIUInt64 mapSize;
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BIUInt64 descriptorSize;
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BIUInt32 mapKey;
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BIUInt32 descriptorVersion;
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} BIMemoryMap;
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typedef struct {
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BIUInt64 kernelSize;
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void* kernelAddress;
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} BIKernelInfo;
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typedef struct {
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BIUInt64 magic;
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BIKernelInfo kernelInfo;
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void* dtb;
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BIMemoryMap memoryMap;
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BIFramebuffer framebuffer;
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} Bootinfo;
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#define BOOTINFO_MAGIC 0x736F6E7961
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@@ -0,0 +1,30 @@
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cmake_minimum_required(VERSION 3.10)
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project(MyShittyKernel LANGUAGES ASM C)
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if(NOT LLVM_BIN)
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execute_process(COMMAND brew --prefix llvm OUTPUT_VARIABLE LLVM_PREFIX OUTPUT_STRIP_TRAILING_WHITESPACE)
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set(LLVM_BIN "${LLVM_PREFIX}/bin")
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endif()
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set(CMAKE_C_COMPILER "${LLVM_BIN}/clang")
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set(CMAKE_ASM_COMPILER "${LLVM_BIN}/clang")
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set(LLVM_OBJCOPY "${LLVM_BIN}/llvm-objcopy")
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set(TARGET_TRIPLE aarch64-none-elf)
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add_compile_options(--target=${TARGET_TRIPLE} -ffreestanding -nostdlib -O0 -g)
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set(LINKER_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld)
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add_link_options(
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--target=${TARGET_TRIPLE}
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-fuse-ld=lld
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-nostdlib
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-static
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-Wl,-T,${LINKER_SCRIPT}
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)
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add_executable(kernel.elf Source/entry.S)
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add_custom_command(TARGET kernel.elf POST_BUILD
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COMMAND ${LLVM_OBJCOPY} -O binary kernel.elf kernel.bin
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COMMENT "kernel.elf -> kernel.bin"
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)
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@@ -0,0 +1,22 @@
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.section .text.boot, "ax"
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.global _start
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_start:
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add x1, x0, #64 // x1 = BIFramebuffer
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ldr x2, [x1] // x2 = base
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ldr x3, [x1, #16] // x3 = width
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ldr x4, [x1, #24] // x4 = height
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mul x5, x3, x4
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mov w6, #0x00FF00
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movk w6, #0x0000, lsl #16
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fill_loop:
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cbz x5, done
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str w6, [x2], #4
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sub x5, x5, #1
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b fill_loop
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done:
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b done
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@@ -0,0 +1,12 @@
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BUILD_DIR := env_var_or_default("BUILD_DIR", justfile_directory() + "/.build")
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TEMP_DIR := env_var_or_default("TEMP_DIR", BUILD_DIR + "/temp")
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build:
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cmake -B {{TEMP_DIR}}/Kernel -S .
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cmake --build {{TEMP_DIR}}/Kernel
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cp {{TEMP_DIR}}/Kernel/kernel.bin {{BUILD_DIR}}/Kernel/ksOSKernel.bin
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@echo "✅ Kernel ready at: {{BUILD_DIR}}/Kernel/ksOSKernel.bin"
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clean:
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rm -rf {{TEMP_DIR}}/Kernel
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@@ -28,21 +28,24 @@ CPU := if ARCH_NAME == "aarch64" { "host" } else { "max" }
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export BUILD_DIR := justfile_directory() + "/.build"
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export TEMP_DIR := BUILD_DIR + "/temp"
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export BOOT_BIN := BUILD_DIR + "/bootloader/BOOTAA64.EFI"
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export BOOT_BIN := BUILD_DIR + "/Bootloader/BOOTAA64.EFI"
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export IMG_FILE := BUILD_DIR + "/ksOS.img"
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mod Bootloader
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mod Kernel
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_default:
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just --list
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_prep:
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@mkdir -p {{BUILD_DIR}}/bootloader
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@mkdir -p {{TEMP_DIR}}/bootloader
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@mkdir -p {{BUILD_DIR}}/Bootloader
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@mkdir -p {{TEMP_DIR}}/Bootloader
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@mkdir -p {{BUILD_DIR}}/Kernel
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@build: _prep
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@echo "🛠️ Building everything..."
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just Bootloader build
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just Kernel build
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@_image: build
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@echo "💾 Creating image..."
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@@ -50,19 +53,21 @@ _prep:
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@mkfs.fat -F 32 {{IMG_FILE}} > /dev/null
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@mmd -i {{IMG_FILE}} ::/EFI ::/EFI/BOOT
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@mcopy -i {{IMG_FILE}} {{BOOT_BIN}} ::/EFI/BOOT/BOOTAA64.EFI
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@mcopy -i {{IMG_FILE}} {{BUILD_DIR}}/Kernel/ksOSKernel.bin ::/ksOSKernel.bin
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@run: _image
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@echo "🚀 Launching..."
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qemu-system-aarch64 {{ACCEL}} \
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-machine virt \
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-machine virt,acpi=off \
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-cpu {{CPU}} \
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-m 512M \
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-device virtio-gpu-pci \
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-device ramfb \
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-display cocoa,show-cursor=on \
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-drive if=pflash,format=raw,readonly=on,file={{OVMF_ARM}} \
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-drive file={{IMG_FILE}},format=raw,if=none,id=hd0 \
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-device virtio-blk-device,drive=hd0 \
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-serial mon:stdio
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-serial stdio \
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-monitor telnet:127.0.0.1:5555,server,nowait
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@clean:
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rm -rf {{BUILD_DIR}}
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