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sykwersykwer
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Base environment
0 parents  commit d9ee778

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‎.gitignore

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build
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fs

‎Makefile

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CC = x86_64-w64-mingw32-gcc
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CFLAGS = -Wall -Wextra
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CFLAGS += -nostdinc -nostdlib -fno-builtin -fno-common
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# https://forum.osdev.org/viewtopic.php?f=1&t=28307
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CFLAGS += -fno-stack-check -fno-stack-protector -mno-stack-arg-probe
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CFLAGS += -Wl,--subsystem,10
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all: build/OVMF.fd fs/EFI/BOOT/BOOTX64.EFI
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build/BOOTX64.EFI: build/bootloader.o build/efi.o build/file.o build/hardware_info.o build/memory.o build/util.o
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mkdir -p build
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$(CC) $(CFLAGS) -e efi_main -o $@ $^
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build/%.o: %.c
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mkdir -p build
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$(CC) $(CFLAGS) -Iinclude -c -o $@ $<
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build/OVMF.fd:
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mkdir -p build
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wget -O build/OVMF.zip http://downloads.sourceforge.net/project/edk2/OVMF/OVMF-X64-r15214.zip
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unzip build/OVMF.zip -d build
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fs/EFI/BOOT/BOOTX64.EFI: build/BOOTX64.EFI
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mkdir -p fs/EFI/BOOT
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cp $< $@
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clean:
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rm -Rf build/* fs/*
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.PHONY: all clean

‎bootloader.c

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#include <efi.h>
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#include <file.h>
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#include <hardware_info.h>
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#include <memory.h>
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#include <util.h>
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#define MB 1048576 // 1024 * 1024
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#define KERNEL_NAME_LEN 6
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static const CHAR16 AppleFirmwareVendor[6] = L"Apple";
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static CHAR16 KERNEL_NAME[KERNEL_NAME_LEN] = L"kernel";
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static CHAR16 APP1_NAME[] = L"app1";
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static CHAR16 APP2_NAME[] = L"app2";
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static CHAR16 APP3_NAME[] = L"app3";
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static const unsigned long long KERNEL_START = 0x100000000;
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static const unsigned long long APP1_START = 0x104000000;
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static const unsigned long long APP2_START = 0x105000000;
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static const unsigned long long APP3_START = 0x106000000;
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void check_pixel_format() {
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// TODO: Support other pixel formats
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if (get_pixel_format() == PixelBlueGreenRedReserved8BitPerColor) {
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puts(L"Pixel format `PixelRedGreenBlueReversed8BitPerColor is supported\r\n`");
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} else {
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puts(L"Unsupported pixel format: ");
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puth(get_pixel_format(), 8);
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while(1);
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}
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}
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void apple_support() {
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EFI_STATUS status;
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// Thanks to the rEFIt 0.14 project for having figured this out long ago.
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// ConsoleControlProtocol is needed to switch Mac boot graphics to text mode.
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if (compare(SystemTable->FirmwareVendor, AppleFirmwareVendor, 6)) {
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status = SystemTable->BootServices->LocateProtocol(&ccp_guid, NULL, (void **)&CCP);
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if (EFI_ERROR(status)) CCP = NULL;
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if (CCP != NULL) {
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EFI_CONSOLE_CONTROL_SCREEN_MODE mode;
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CCP->GetMode(CCP, &mode, NULL, NULL);
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if (mode != EfiConsoleControlScreenText) {
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CCP->SetMode(CCP, EfiConsoleControlScreenText);
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}
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}
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}
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}
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EFI_STATUS efi_main(EFI_HANDLE ImageHandle, struct EFI_SYSTEM_TABLE *st) {
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EFI_STATUS status;
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efi_init(st);
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get_hardware_info();
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SystemTable->ConOut->ClearScreen(SystemTable->ConOut);
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check_pixel_format();
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apple_support();
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puts(L"Loading kernel image...\r\n");
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// Assuming UEFI firmware recognizes multiple volumes, find the volume where kernel is located
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struct EFI_FILE_PROTOCOL *kernel_file = NULL;
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struct EFI_FILE_PROTOCOL *app1_file = NULL;
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struct EFI_FILE_PROTOCOL *app2_file = NULL;
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struct EFI_FILE_PROTOCOL *app3_file = NULL;
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{
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UINTN handle_cnt;
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EFI_HANDLE *handle_buffer;
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status = SystemTable->BootServices->LocateHandleBuffer(ByProtocol, &sfsp_guid, NULL, &handle_cnt, &handle_buffer);
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assert(status, L"BootServices#LocateHandleBuffer error");
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struct EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *fs;
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for (UINTN i = 0; i < handle_cnt; i++) {
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status = SystemTable->BootServices->HandleProtocol(handle_buffer[i], &sfsp_guid, (void **)&fs);
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assert(status, L"BootServices#HandleProtocol error");
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struct EFI_FILE_PROTOCOL *root;
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status = fs->OpenVolume(fs, &root);
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assert(status, L"OpenVolume error");
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char kernel_found = 0;
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while (1) {
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UINTN buffer_size = 256; // Arbitrary size
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unsigned char buffer[buffer_size];
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status = root->Read(root, &buffer_size, (void *)buffer);
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assert(status, L"EFI_FILE_PROTOCOL#Read error");
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if (buffer_size == 0) break;
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struct EFI_FILE_INFO *file_info = (struct EFI_FILE_INFO *)buffer;
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if (compare(file_info->FileName, KERNEL_NAME, KERNEL_NAME_LEN)) kernel_found = 1;
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}
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if (kernel_found) {
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status = root->Open(root, &kernel_file, KERNEL_NAME, EFI_FILE_MODE_READ, 0);
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assert(status, L"EFI_FILE_PROTOCOL#Read error");
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status = root->Open(root, &app1_file, APP1_NAME, EFI_FILE_MODE_READ, 0);
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assert(status, L"EFI_FILE_PROTOCOL#Read error");
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status = root->Open(root, &app2_file, APP2_NAME, EFI_FILE_MODE_READ, 0);
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assert(status, L"EFI_FILE_PROTOCOL#Read error");
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status = root->Open(root, &app3_file, APP3_NAME, EFI_FILE_MODE_READ, 0);
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assert(status, L"EFI_FILE_PROTOCOL#Read error");
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}
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root->Close(root);
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}
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}
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if (!kernel_file) {
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puts(L"kernel file not found\r\n");
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while (1);
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}
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struct header {
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void *bss_start;
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UINTN bss_size;
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} head;
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unsigned long long head_size = sizeof(head);
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{
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unsigned long long kernel_size = file_size(kernel_file);
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load_file(kernel_file, (void *)&head, head_size);
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kernel_size -= head_size;
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load_file(kernel_file, (void *)KERNEL_START, kernel_size);
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}
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{
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unsigned long long app1_size = file_size(app1_file);
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load_file(app1_file, (void *)&head, head_size);
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app1_size -= head_size;
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load_file(app1_file, (void *)APP1_START, app1_size);
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}
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{
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unsigned long long app2_size = file_size(app2_file);
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load_file(app2_file, (void *)&head, head_size);
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app2_size -= head_size;
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load_file(app2_file, (void *)APP2_START, app2_size);
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}
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{
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unsigned long long app3_size = file_size(app3_file);
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load_file(app3_file, (void *)&head, head_size);
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app3_size -= head_size;
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load_file(app3_file, (void *)APP3_START, app3_size);
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}
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kernel_file->Close(kernel_file);
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app1_file->Close(app1_file);
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app2_file->Close(app2_file);
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app3_file->Close(app3_file);
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SystemTable->BootServices->SetMem(head.bss_start, head.bss_size, 0);
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unsigned long long arg1 = (unsigned long long)SystemTable;
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unsigned long long arg2 = (unsigned long long)&hardware_info;
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unsigned long long stack_base = KERNEL_START + (16 * MB);
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// On success, this loader owns all available memory in the system.
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puts(L"Exiting boot service...\r\n");
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exit_boot_services(ImageHandle);
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asm ("mov %0, %%rdi\n"
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"mov %1, %%rsi\n"
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"mov %2, %%rsp\n"
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"jmp *%3\n"
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::"m"(arg1), "m"(arg2), "m"(stack_base), "m"(KERNEL_START));
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puts(L"Not reached here\r\n");
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while (1);
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}

‎efi.c

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#include <efi.h>
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#include <util.h>
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struct EFI_SYSTEM_TABLE *SystemTable;
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struct EFI_CONSOLE_CONTROL_PROTOCOL *CCP;
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struct EFI_GRAPHICS_OUTPUT_PROTOCOL *GOP;
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struct EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *SFSP;
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struct EFI_GUID ccp_guid = { 0xf42f7782, 0x12e, 0x4c12, {0x99, 0x56, 0x49, 0xf9, 0x43, 0x4, 0xf7, 0x21} };
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struct EFI_GUID gop_guid = {0x9042a9de, 0x23dc, 0x4a38, {0x96, 0xfb, 0x7a, 0xde, 0xd0, 0x80, 0x51, 0x6a}};
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struct EFI_GUID sfsp_guid = {0x0964e5b22,0x6459,0x11d2, {0x8e,0x39,0x00,0xa0,0xc9,0x69,0x72,0x3b}};
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// EFI_FILE_INFO_ID
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struct EFI_GUID fi_guid = {0x09576e92, 0x6d3f, 0x11d2, {0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b}};
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// EFI_ACPI_TABLE_GUID
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struct EFI_GUID acpi_table_guid = {0x8868e871,0xe4f1,0x11d3, {0xbc,0x22,0x00,0x80,0xc7,0x3c,0x88,0x81}};
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void efi_init(struct EFI_SYSTEM_TABLE *st) {
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SystemTable = st;
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SystemTable->BootServices->LocateProtocol(&gop_guid, NULL, (void **)&GOP);
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SystemTable->BootServices->LocateProtocol(&sfsp_guid, NULL, (void **)&SFSP);
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}
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void *find_acpi_table() {
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for (UINTN i = 0; i < SystemTable->NumberOfTableEntries; i++) {
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struct EFI_GUID *guid = &SystemTable->ConfigurationTable[i].VendorGuid;
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if (compare_guid(guid, &acpi_table_guid)) return SystemTable->ConfigurationTable[i].VendorTable;
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}
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return NULL;
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}

‎file.c

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#include <efi.h>
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#include <file.h>
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#include <util.h>
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#define READ_UNIT 16384 // 16KiB
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void load_file(struct EFI_FILE_PROTOCOL *src, void *dst, unsigned long long size) {
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while (size > READ_UNIT) {
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UINTN unit = READ_UNIT;
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EFI_STATUS status = src->Read(src, &unit, dst);
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assert(status, L"EFI_FILE_PROTOCOL#Read error");
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size -= unit;
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dst += unit;
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}
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while (size > 0) {
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unsigned long long sz = size;
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EFI_STATUS status = src->Read(src, &sz, dst);
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assert(status, L"EFI_FILE_PROTOCOL#Read error");
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size -= sz;
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dst += sz;
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}
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}
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unsigned long long file_size(struct EFI_FILE_PROTOCOL *file) {
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struct EFI_FILE_INFO file_info;
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UINTN buffer_size = sizeof(file_info);
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EFI_STATUS status = file->GetInfo(file, &fi_guid, &buffer_size, (void *)&file_info);
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assert(status, L"EFI_FILE_PROTOCOL#GetInfo error");
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return file_info.FileSize;
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}

‎hardware_info.c

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#include <efi.h>
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#include <hardware_info.h>
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struct HardwareInfo hardware_info;
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void get_hardware_info() {
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hardware_info.fb.base = (struct Pixel *)GOP->Mode->FrameBufferBase;
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hardware_info.fb.width = GOP->Mode->Info->HorizontalResolution;
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hardware_info.fb.height = GOP->Mode->Info->VerticalResolution;
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hardware_info.fb.total_size = GOP->Mode->FrameBufferSize;
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hardware_info.rsdp = find_acpi_table();
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}
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EFI_GRAPHICS_PIXEL_FORMAT get_pixel_format() {
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return GOP->Mode->Info->PixelFormat;
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}

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