some modify

.gitignore

@@ -1 +1,5 @@
 .vscode/settings.json
+**/a.out
+mkramfs/ramfs.img
+mkramfs/mkramfs
+FAT/

elf.c

@@ -0,0 +1,30 @@
+#include "elf.h"
+#include "text.h"
+#include <Library/BaseMemoryLib.h>
+
+void run(char *elfdata) {
+    if (elfdata[EI_CLASS] == ELFCLASS32) {
+        Elf32_Ehdr elf32header;
+        CopyMem(&elf32header, elfdata, sizeof(elf32header));
+        if (!IS_ELF(elf32header)) {
+            print("This is not ELF file!");
+        }
+        if (elf32header.e_ident[EI_OSABI] != ELFOSABI_LINUX &&
+            elf32header.e_ident[EI_OSABI] != ELFOSABI_NONE) {
+            print("This ELF file is not valid OS ABI!");
+        }
+        if (elf32header.e_machine != EM_386 &&
+            elf32header.e_machine != EM_486 &&
+            elf32header.e_machine != EM_X86_64) {
+            print("This ELF file is not for x86 or x86_64!");
+        }
+        if (elf32header.e_type == ET_REL) {
+        } else if (elf32header.e_type == ET_EXEC) {
+        } else if (elf32header.e_type == ET_DYN) {
+        }
+
+    } else if (elfdata[EI_CLASS] == ELFCLASS64) {
+        Elf64_Ehdr elf64header;
+        CopyMem(&elf64header, elfdata, sizeof(elf64header));
+    }
+}

elf.h

@@ -0,0 +1,3 @@
+#include <../BaseTools/Source/C/GenFw/elf_common.h>
+#include <../BaseTools/Source/C/GenFw/elf32.h>
+#include <../BaseTools/Source/C/GenFw/elf64.h>

interrupt.c

@@ -1,6 +1,7 @@
 #include <Library/BaseLib.h>
 
 #include "io.h"
+#include "keycode.h"
 #include "text.h"
 #define SPECIAL_SHIFT_L 0b00000001
 #define SPECIAL_SHIFT_R 0b00000010
@@ -82,41 +83,81 @@ void interrupt_init() {
 
 void keyboard_int_proc() {
     UINT8 data;
-    // static char keyboard_special_keys = 0;
+    static BOOLEAN special_flag = FALSE;
+    static char keyboard_special_keys = 0;
     data = mapped_io_read(0x64);
     if ((data & 0b00000001) == 0)  // output buffer is not full
         goto eoi;
     data = mapped_io_read(0x60);
-    /*
+    if (data == 0xE0) {
-    if (data & 0b10000000){  // key is broken
+        special_flag = TRUE;
+        goto eoi;
+    }
+
+    if (data & 0b10000000) {  // key is broken
         switch (data & 0b01111111) {
-            case 44:
+            case 0x2A:
                 keyboard_special_keys &= ~SPECIAL_SHIFT_L;
-                return;
+                goto eoi;
-            case 57:
+            case 0x36:
                 keyboard_special_keys &= ~SPECIAL_SHIFT_R;
-                return;
+                goto eoi;
-            case 58:
+            case 0x1D:
+                if (!special_flag)
                     keyboard_special_keys &= ~SPECIAL_CTRL_L;
-                return;
+                else
-            case 64:
                     keyboard_special_keys &= ~SPECIAL_CTRL_R;
-                return;
+                goto eoi;
-            case 60:
+            case 0x38:
+                if (!special_flag)
                     keyboard_special_keys &= ~SPECIAL_ALT_L;
-                return;
+                else
-            case 62:
                     keyboard_special_keys &= ~SPECIAL_ALT_R;
-                return;
+                goto eoi;
-            case :
+            case 0x5B:
-                keyboard_special_keys &= ~SPECIAL_CTRL_L;
+                if (special_flag) keyboard_special_keys &= ~SPECIAL_SUPER_L;
-                return;
+                goto eoi;
+            case 0x5C:
+                if (special_flag) keyboard_special_keys &= ~SPECIAL_SUPER_L;
+                goto eoi;
+        }
+    } else {  // key is make
+        switch (data & 0b01111111) {
+            case 0x2A:
+                keyboard_special_keys |= SPECIAL_SHIFT_L;
+                goto eoi;
+            case 0x36:
+                keyboard_special_keys |= SPECIAL_SHIFT_R;
+                goto eoi;
+            case 0x1D:
+                if (!special_flag)
+                    keyboard_special_keys |= SPECIAL_CTRL_L;
+                else
+                    keyboard_special_keys |= SPECIAL_CTRL_R;
+                goto eoi;
+            case 0x38:
+                if (!special_flag)
+                    keyboard_special_keys |= SPECIAL_ALT_L;
+                else
+                    keyboard_special_keys |= SPECIAL_ALT_R;
+                goto eoi;
+            case 0x5B:
+                if (special_flag) keyboard_special_keys |= SPECIAL_SUPER_L;
+                goto eoi;
+            case 0x5C:
+                if (special_flag) keyboard_special_keys |= SPECIAL_SUPER_L;
+                goto eoi;
             default:
-                return;
+                if ((keyboard_special_keys & SPECIAL_SHIFT_L) ||
+                    (keyboard_special_keys & SPECIAL_SHIFT_R)) {
+                    if (keycode_to_ascii_shift[data])
+                        textout(keycode_to_ascii_shift[data]);
+                } else if (keycode_to_ascii[data])
+                    textout(keycode_to_ascii[data]);
+
+                goto eoi;
         }
     }
-    */
-    textout('0');
 eoi:
     end_of_interrupt(33);
 }

io.c

@@ -8,3 +8,33 @@ UINT8 mapped_io_read(UINT16 addr) {
 void mapped_io_write(UINT16 addr, UINT8 data) {
     asm volatile("outb %0,%1" ::"a"(data), "d"(addr));
 }
+
+UINT16 mapped_io_read_word(UINT16 addr) {
+    UINT16 data;
+    asm volatile("inw %1,%0" : "=a"(data) : "d"(addr));
+    return data;
+}
+
+void mapped_io_write_word(UINT16 addr, UINT16 data) {
+    asm volatile("outw %0,%1" ::"a"(data), "d"(addr));
+}
+
+UINT32 mapped_io_read_dword(UINT16 addr) {
+    UINT32 data;
+    asm volatile("inl %1,%0" : "=a"(data) : "d"(addr));
+    return data;
+}
+
+void mapped_io_write_dword(UINT16 addr, UINT32 data) {
+    asm volatile("outl %0,%1" ::"a"(data), "d"(addr));
+}
+
+UINT64 mapped_io_read_qword(UINT16 addr) {
+    UINT64 data;
+    asm volatile("inq %1,%0" : "=a"(data) : "d"(addr));
+    return data;
+}
+
+void mapped_io_write_qword(UINT16 addr, UINT64 data) {
+    asm volatile("outq %0,%1" ::"a"(data), "d"(addr));
+}

keycode.h

@@ -0,0 +1,40 @@
+char keycode_to_ascii[] = {
+    0,    0,   '1', '2',  '3', '4', '5', '6', '7', '8', '9', '0', '-', '^',
+    0,    0,   'q', 'w',  'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '@', '[',
+    '\n', 0,   'a', 's',  'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', ':', 0,
+    0,    ']', 'z', 'x',  'c', 'v', 'b', 'n', 'm', ',', '.', '/', 0,   '*',
+    0,    ' ', 0,   0,    0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+    0,    '7', '8', '9',  '-', '4', '5', '6', '+', '1', '2', '3', '0', '.',
+    0,    0,   0,   0,    0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+    0,    0,   0,   0,    0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+    0,    0,   0,   '\\', 0,   0,   0,   0,   0,   0,   0,   0,   0,   '\\',
+    0,    0,   0,   0,    0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+    0,    0,   0,   0,    0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+    0,    0,   0,   0,    0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+    0,    0,   0,   0,    0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+    0,    0,   0,   0,    0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+    0,    0,   0,   0,    0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+    0,    0,   0,   0,    0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+    0,    0,   0,   0,    0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+    0,    0,   0,   0,    0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+    0,    0,   0,   0};
+
+char keycode_to_ascii_shift[] = {
+    0,   0,   '!', '"', '#', '$', '%', '&', '\'', '(', ')', 0,   '=', '~', 0,
+    0,   'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I',  'O', 'P', '`', '{', 0,   0,
+    'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L',  '+', '*', 0,   0,   '}', 'Z',
+    'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?',  0,   '*', 0,   ' ', 0,   0,
+    0,   0,   0,   0,   0,   0,   0,   0,   0,    0,   0,   '7', '8', '9', '-',
+    '4', '5', '6', '+', '1', '2', '3', '0', '.',  0,   0,   0,   0,   0,   0,
+    0,   0,   0,   0,   0,   0,   0,   0,   0,    0,   0,   0,   0,   0,   0,
+    0,   0,   0,   0,   0,   0,   0,   0,   0,    0,   '_', 0,   0,   0,   0,
+    0,   0,   0,   0,   0,   '|', 0,   0,   0,    0,   0,   0,   0,   0,   0,
+    0,   0,   0,   0,   0,   0,   0,   0,   0,    0,   0,   0,   0,   0,   0,
+    0,   0,   0,   0,   0,   0,   0,   0,   0,    0,   0,   0,   0,   0,   0,
+    0,   0,   0,   0,   0,   0,   0,   0,   0,    0,   0,   0,   0,   0,   0,
+    0,   0,   0,   0,   0,   0,   0,   0,   0,    0,   0,   0,   0,   0,   0,
+    0,   0,   0,   0,   0,   0,   0,   0,   0,    0,   0,   0,   0,   0,   0,
+    0,   0,   0,   0,   0,   0,   0,   0,   0,    0,   0,   0,   0,   0,   0,
+    0,   0,   0,   0,   0,   0,   0,   0,   0,    0,   0,   0,   0,   0,   0,
+    0,   0,   0,   0,   0,   0,   0,   0,   0,    0,   0,   0,   0,   0,   0,
+    0};

main.c

@@ -9,20 +9,68 @@
 #include <Pi/PiMultiPhase.h>
 #include <Protocol/MpService.h>
 */
-
+#include <Guid/Acpi.h>
 #include <Uefi.h>
 #include <Uefi/UefiSpec.h>
 
 #include "fb.h"
 #include "gdt.h"
 #include "interrupt.h"
+#include "ramfs.h"
 #include "text.h"
 
+#pragma pack(1)
+typedef struct {
+    EFI_ACPI_DESCRIPTION_HEADER header;
+    EFI_ACPI_DESCRIPTION_HEADER *entry[0];
+} XSDT;
+
+typedef struct {
+    EFI_ACPI_DESCRIPTION_HEADER header;
+    UINT32 EventTimerBlockID;
+    EFI_ACPI_2_0_GENERIC_ADDRESS_STRUCTURE BaseAddress;
+    UINT8 HPETNumber;
+    UINT16 MinimumTick;
+    UINT8 Flags;
+} HPET;
+#pragma pack()
+
+EFI_ACPI_DESCRIPTION_HEADER *Get_SDT(EFI_SYSTEM_TABLE *SystemTable,
+                                     UINT64 Signature) {
+    EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER *ACPI_Table;
+    EFI_GUID gEfiAcpiTableGuid = EFI_ACPI_TABLE_GUID;
+    for (UINTN i = 0; i < SystemTable->NumberOfTableEntries; i++) {
+        EFI_CONFIGURATION_TABLE *table = SystemTable->ConfigurationTable + i;
+        if (table->VendorGuid.Data1 == gEfiAcpiTableGuid.Data1 &&
+            table->VendorGuid.Data2 == gEfiAcpiTableGuid.Data2 &&
+            table->VendorGuid.Data3 == gEfiAcpiTableGuid.Data3 &&
+            table->VendorGuid.Data4[0] == gEfiAcpiTableGuid.Data4[0] &&
+            table->VendorGuid.Data4[1] == gEfiAcpiTableGuid.Data4[1] &&
+            table->VendorGuid.Data4[2] == gEfiAcpiTableGuid.Data4[2] &&
+            table->VendorGuid.Data4[3] == gEfiAcpiTableGuid.Data4[3] &&
+            table->VendorGuid.Data4[4] == gEfiAcpiTableGuid.Data4[4] &&
+            table->VendorGuid.Data4[5] == gEfiAcpiTableGuid.Data4[5] &&
+            table->VendorGuid.Data4[6] == gEfiAcpiTableGuid.Data4[6] &&
+            table->VendorGuid.Data4[7] == gEfiAcpiTableGuid.Data4[7]) {
+            ACPI_Table = (EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER *)
+                             table->VendorTable;
+        }
+    }
+    XSDT *xsdt = (XSDT *)ACPI_Table->XsdtAddress;
+
+    for (int i = 0;
+         i < (xsdt->header.Length - sizeof(EFI_ACPI_DESCRIPTION_HEADER)) /
+                 sizeof(EFI_ACPI_DESCRIPTION_HEADER *);
+         i++) {
+        if (xsdt->entry[i]->Signature == Signature) return xsdt->entry[i];
+    }
+    return NULL;
+}
+
 EFI_STATUS EFIAPI UefiMain(IN EFI_HANDLE ImageHandle,
                            IN EFI_SYSTEM_TABLE *SystemTable) {
     EFI_STATUS Status;
     EFI_GRAPHICS_OUTPUT_PROTOCOL *gop;
-    EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *fsp;
     // EFI_MP_SERVICES_PROTOCOL *mps;
 
     SystemTable->BootServices->SetWatchdogTimer(
@@ -37,14 +85,6 @@ EFI_STATUS EFIAPI UefiMain(IN EFI_HANDLE ImageHandle,
         return Status;
     }
 
-    Status = SystemTable->BootServices->LocateProtocol(
-        &gEfiSimpleFileSystemProtocolGuid, NULL, (VOID **)&fsp);
-    if (EFI_ERROR(Status)) {
-        Print(L"Error:Failed to locate EFI Simple FileSystem Protocol - %r",
-              Status);
-        return Status;
-    }
-
     /*
         Status = SystemTable->BootServices->LocateProtocol(
             &gEfiMpServiceProtocolGuid, NULL,
@@ -54,22 +94,119 @@ EFI_STATUS EFIAPI UefiMain(IN EFI_HANDLE ImageHandle,
        Status); return Status;
         }
     */
-
+    // HPET *hpet_table = (HPET *)Get_SDT(
+    //    SystemTable, EFI_ACPI_3_0_HIGH_PRECISION_EVENT_TIMER_TABLE_SIGNATURE);
     FrameBuffer_init(gop);
+    ramfsinit(SystemTable);
     UINTN MemoryMapSize = 1, MapKey, DescriptorSize;
     UINT32 DescriptorVersion;
+    EFI_MEMORY_DESCRIPTOR *mem_desc;
     do {
-        EFI_MEMORY_DESCRIPTOR *mem_desc =
+        Status = SystemTable->BootServices->AllocatePool(
-            (EFI_MEMORY_DESCRIPTOR *)AllocatePool(MemoryMapSize);
+            EfiLoaderData, MemoryMapSize, (void **)&mem_desc);
+        if (EFI_ERROR(Status)) {
+            Print(L"Error:Failed to allocate memory map memory - %r\n", Status);
+            continue;
+        }
         Status = SystemTable->BootServices->GetMemoryMap(
             &MemoryMapSize, mem_desc, &MapKey, &DescriptorSize,
             &DescriptorVersion);
-        if (EFI_ERROR(Status)) continue;
+        if (EFI_ERROR(Status)) {
+            Print(L"Error:Failed to get memory map - %r\n", Status);
+            SystemTable->BootServices->FreePool(mem_desc);
+            continue;
+        }
         Status =
             SystemTable->BootServices->ExitBootServices(ImageHandle, MapKey);
-    } while (EFI_ERROR(Status));
+        if (EFI_ERROR(Status)) {
+            Print(L"Error:Failed to exit boot service - %r\n", Status);
+            SystemTable->BootServices->FreePool(mem_desc);
+            continue;
+        }
+        break;
+    } while (TRUE);
+    for (int y = 0; y < buffer.VerticalRes; y++) {
+        for (int x = 0; x < buffer.HorizontalRes; x++) {
+            EFI_GRAPHICS_OUTPUT_BLT_PIXEL *pixel =
+                (EFI_GRAPHICS_OUTPUT_BLT_PIXEL *)buffer.BaseAddress +
+                (buffer.HorizontalRes * y) + x;
+            RGBtoPixel(pixel, 0x000000);
+        }
+    }
+    for (UINTN i = (UINTN)mem_desc; i < ((UINTN)mem_desc + MemoryMapSize);
+         i += DescriptorSize) {
+        ((EFI_MEMORY_DESCRIPTOR *)i)->VirtualStart =
+            ((EFI_MEMORY_DESCRIPTOR *)i)->PhysicalStart;
+    }
+    SystemTable->RuntimeServices->SetVirtualAddressMap(
+        MemoryMapSize, DescriptorSize, DescriptorVersion, mem_desc);
+    for (UINTN i = (UINTN)mem_desc; i < ((UINTN)mem_desc + MemoryMapSize);
+         i += DescriptorSize) {
+        print("Type:");
+        switch (((EFI_MEMORY_DESCRIPTOR *)i)->Type) {
+            case EfiReservedMemoryType:
+                print("EfiReservedMemoryType");
+                break;
+            case EfiLoaderCode:
+                print("EfiLoaderCode");
+                break;
+            case EfiLoaderData:
+                print("EfiLoaderData");
+                break;
+            case EfiBootServicesCode:
+                print("EfiBootServicesCode");
+                break;
+            case EfiBootServicesData:
+                print("EfiBootServicesData");
+                break;
+            case EfiRuntimeServicesCode:
+                print("EfiRuntimeServicesCode");
+                break;
+            case EfiRuntimeServicesData:
+                print("EfiRuntimeServicesData");
+                break;
+            case EfiConventionalMemory:
+                print("EfiConventionalMemory");
+                break;
+            case EfiUnusableMemory:
+                print("EfiUnusableMemory");
+                break;
+            case EfiACPIReclaimMemory:
+                print("EfiACPIReclaimMemory");
+                break;
+            case EfiACPIMemoryNVS:
+                print("EfiACPIMemoryNVS");
+                break;
+            case EfiMemoryMappedIO:
+                print("EfiMemoryMappedIO");
+                break;
+            case EfiMemoryMappedIOPortSpace:
+                print("EfiMemoryMappedIOPortSpace");
+                break;
+            case EfiPalCode:
+                print("EfiPalCode");
+                break;
+            case EfiPersistentMemory:
+                print("EfiPersistentMemory");
+                break;
+            case EfiMaxMemoryType:
+                print("EfiMaxMemoryType");
+                break;
+        }
+        print(" Physical:");
+        printhex(((EFI_MEMORY_DESCRIPTOR *)i)->PhysicalStart, 0);
+        print(" Virtual:");
+        printhex(((EFI_MEMORY_DESCRIPTOR *)i)->VirtualStart, 0);
+        print(" Pages:");
+        printhex(((EFI_MEMORY_DESCRIPTOR *)i)->NumberOfPages, 0);
+        print(" Attribute:");
+        printhex(((EFI_MEMORY_DESCRIPTOR *)i)->Attribute, 0);
+        print("\n");
+    }
+
     GDT_init();
     interrupt_init();
+    /*
     for (int y = 0; y < buffer.VerticalRes; y++) {
         for (int x = 0; x < buffer.HorizontalRes; x++) {
             EFI_GRAPHICS_OUTPUT_BLT_PIXEL *pixel =
@@ -77,12 +214,7 @@ EFI_STATUS EFIAPI UefiMain(IN EFI_HANDLE ImageHandle,
                 (buffer.HorizontalRes * y) + x;
             RGBtoPixel(pixel, 0xFF0000);
         }
-    }
+    }*/
-    textout('A');
-    textout('p');
-    textout('p');
-    textout('l');
-    textout('e');
     while (1) asm volatile("hlt");
     return Status;
 }

memory.c

@@ -0,0 +1,5 @@
+#include <Library/BaseLib.h>
+#include <Uefi.h>
+#include <Uefi/UefiSpec.h>
+
+void VMemInit() { UINTN *PageTable = (UINTN *)AsmReadCr3(); }

mkramfs/Makefile

@@ -0,0 +1,8 @@
+CC := g++
+CFLAGS := -std=c++17
+
+
+mkramfs: main.cpp
+	$(CC) $(CFLAGS) -o mkramfs main.cpp
+
+clean:	$(RM) mkramfs

mkramfs/main.cpp

@@ -0,0 +1,37 @@
+#include <string.h>
+
+#include <filesystem>
+#include <fstream>
+#include <iostream>
+typedef struct {
+    int Start;
+    int Size;
+    char name[256];
+} FILE_DESC;
+
+int main(int argc, char **argv) {
+    if (argc == 1) {
+        std::cout << "Usage:mkramfs <file1> <file2> ..." << std::endl;
+        return -1;
+    }
+    FILE_DESC descriptor[256] = {0};
+    std::ofstream ramfs("ramfs.img", std::ios::binary | std::ios::ate);
+    for (int i = 1; i < argc; i++) {
+        if (!std::filesystem::exists(std::filesystem::path(argv[i]))) {
+            std::cout << "file does not exist! - " << argv[i] << std::endl;
+            continue;
+        }
+        descriptor[i].Start = descriptor[i - 1].Start + descriptor[i - 1].Size;
+        descriptor[i].Size =
+            std::filesystem::file_size(std::filesystem::path(argv[i]));
+        strncpy(descriptor[i].name,
+                std::filesystem::path(argv[i]).filename().c_str(), 255);
+    }
+    ramfs.write(reinterpret_cast<char *>(descriptor), sizeof(descriptor));
+    for (int i = 1; i < argc; i++) {
+        std::ifstream file(argv[i], std::ios::binary);
+        ramfs << file.rdbuf();
+        file.close();
+    }
+    ramfs.close();
+}

pci.c

@@ -0,0 +1,51 @@
+#include <IndustryStandard/Pci.h>
+#include <Uefi.h>
+#include <Uefi/UefiSpec.h>
+
+typedef struct {
+    BOOLEAN isUsing;
+    BOOLEAN isIDE;  // T:IDE F:AHCI
+    UINT8 bus;
+    UINT8 device;
+    UINT8 function;
+} DiskController;
+
+DiskController controllers[5];
+
+void init_pci() {
+    for (UINT8 bus = 0; bus < 256; bus++) {
+        for (UINT8 device = 0; device < 32; device++) {
+            for (UINT8 function = 0; function < 8; function++) {
+                UINT32 ConfigData =
+                    PciCf8Read32(PCI_CF8_LIB_ADDRESS(bus, device, function, 0));
+                if (ConfigData != 0xffffffff) {
+                    ConfigData = PciCf8Read32(
+                        PCI_CF8_LIB_ADDRESS(bus, device, function, 8));
+                    if ((ConfigData >> 16) == 0x0101) {  // IDE Controller
+                        int n = 0;
+                        while (controllers[n].isUsing) {
+                            n++;
+                        }
+                        controllers[n].isUsing = TRUE;
+                        controllers[n].isIDE = TRUE;
+                        controllers[n].bus = bus;
+                        controllers[n].device = device;
+                        controllers[n].function = function;
+                        return;
+                    } else if ((ConfigData >> 8) ==
+                               0x010601) {  // AHCI Controller
+                        int n = 0;
+                        while (controllers[n].isUsing) {
+                            n++;
+                        }
+                        controllers[n].isUsing = TRUE;
+                        controllers[n].isIDE = FALSE;
+                        controllers[n].bus = bus;
+                        controllers[n].device = device;
+                        controllers[n].function = function;
+                    }
+                }
+            }
+        }
+    }
+}

ramfs.c

@@ -0,0 +1,56 @@
+#include "ramfs.h"
+
+#include <Guid/FileInfo.h>
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/PrintLib.h>
+#include <Library/UefiLib.h>
+#include <Uefi.h>
+
+#include "text.h"
+RAMFS_DATA *data;
+void ramfsinit(
+    EFI_SYSTEM_TABLE *SystemTable) {  // must call before ExitBootServices
+    EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *fsp;
+    EFI_FILE_PROTOCOL *Root, *ramfs;
+    EFI_FILE_INFO info;
+    UINTN infosize = sizeof(info), datasize;
+
+    EFI_STATUS Status = SystemTable->BootServices->LocateProtocol(
+        &gEfiSimpleFileSystemProtocolGuid, NULL, (VOID **)&fsp);
+    if (EFI_ERROR(Status)) {
+        Print(L"Error:Failed to locate EFI Simple FileSystem Protocol - %r",
+              Status);
+        return;
+    }
+
+    fsp->OpenVolume(fsp, &Root);
+    Status = Root->Open(Root, &ramfs, L"ramfs.img", EFI_FILE_MODE_READ, 0);
+    if (EFI_ERROR(Status)) {
+        Print(L"Error:Failed to open ramfs file - %r\n", Status);
+        return;
+    }
+    ramfs->GetInfo(ramfs, &gEfiFileInfoGuid, &infosize, &info);
+    Status = SystemTable->BootServices->AllocatePool(
+        EfiLoaderData, info.FileSize, (void **)&data);
+    if (EFI_ERROR(Status)) {
+        Print(L"Error:Failed to allocate ramfs memory - %r\n", Status);
+        return;
+    }
+    datasize = info.FileSize;
+    ramfs->Read(ramfs, &datasize, data);
+}
+
+void getfilesize(char *filename, UINTN *size) {
+    int index;
+    for (index = 0; index < 256; index++)
+        if (!AsciiStrCmp(data->descriptor[index].name, filename)) break;
+    *size = data->descriptor[index].Size;
+}
+
+void readfile(char *filename, UINTN buffersize, void *buffer) {
+    int index;
+    for (index = 0; index < 256; index++)
+        if (!AsciiStrCmp(data->descriptor[index].name, filename)) break;
+    CopyMem(buffer, data->data + data->descriptor[index].Start, buffersize);
+}

ramfs.h

@@ -0,0 +1,15 @@
+#include <Protocol/SimpleFileSystem.h>
+typedef struct {
+    int Start;
+    int Size;
+    char name[256];
+} FILE_DESC;
+
+typedef struct {
+    FILE_DESC descriptor[256];
+    char data[];
+} RAMFS_DATA;
+
+void ramfsinit(EFI_SYSTEM_TABLE *SystemTable);
+void getfilesize(char *filename, UINTN *size);
+void readfile(char *filename, UINTN buffersize, void *buffer);

sprinkleos.dsc

@@ -30,6 +30,8 @@
   MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
   UefiRuntimeServicesTableLib|MdePkg/Library/UefiRuntimeServicesTableLib/UefiRuntimeServicesTableLib.inf
   DevicePathLib|MdePkg/Library/UefiDevicePathLib/UefiDevicePathLib.inf
-
+  PciCf8Lib|MdePkg/Library/BasePciCf8Lib/BasePciCf8Lib.inf
+  IoLib|MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsic.inf
+  RegisterFilterLib|MdePkg/Library/RegisterFilterLibNull/RegisterFilterLibNull.inf
 [Components]
   sprinkleos/sprinkleos.inf

sprinkleos.inf

@@ -14,6 +14,8 @@
   io.c
   text.c
   int_handler.s
+  ramfs.c
+  elf.c
 
 [Packages]
   MdePkg/MdePkg.dec
@@ -21,3 +23,7 @@
 [LibraryClasses]
   UefiLib
   UefiApplicationEntryPoint
+  PciCf8Lib
+
+[Guids]
+  gEfiFileInfoGuid

testapp/main.c

@@ -0,0 +1,3 @@
+int main(){
+return 0;
+}

text.c

@@ -57,6 +57,11 @@ void textinit(EFI_SIMPLE_FILE_SYSTEM_PROTOCOL* fsp) {
 
 void textout(UINT8 code) {
     static UINTN x = 0, y = 0;
+    if (code == '\n') {
+        x = 0;
+        y++;
+        return;
+    }
     for (int row = 0; row < 13; row++) {
         for (int column = 0; column < 8; column++) {
             EFI_GRAPHICS_OUTPUT_BLT_PIXEL *pixel =
@@ -64,7 +69,7 @@ void textout(UINT8 code) {
                 y * 13 * buffer.HorizontalRes + row * buffer.HorizontalRes +
                 8 * x + column;
             if ((font[code][row] >> (7 - column)) & 0x1)
-                RGBtoPixel(pixel, 0x00FF00);
+                RGBtoPixel(pixel, 0xFFFFFF);
         }
     }
     if (x < (buffer.HorizontalRes / 8) - 1)
@@ -74,3 +79,49 @@ void textout(UINT8 code) {
         y++;
     }
 }
+
+void print(char *string) {
+    do {
+        textout(*string);
+        string++;
+    } while (*string != '\0');
+}
+
+UINT64 pow(UINT64 base, UINT64 exponent) {
+    UINT64 ans = 1;
+    for (UINT64 i = 0; i < exponent; i++) {
+        ans *= base;
+    }
+    return ans;
+}
+
+void printhex(UINT64 num, UINT8 digit) {
+    if (digit == 0) {
+        UINT8 maxdigit = 0;
+        while (num >= pow(16, maxdigit)) maxdigit++;
+        print("0x");
+        if (maxdigit == 0) textout('0' + num);
+        while (maxdigit) {
+            UINT64 weight = pow(16, maxdigit - 1);
+            UINT64 ans = num / weight;
+            if (ans < 10)
+                textout('0' + ans);
+            else
+                textout('A' + ans - 10);
+            num -= ans * weight;
+            maxdigit--;
+        }
+    } else {
+        print("0x");
+        while (digit) {
+            UINT64 weight = pow(16, digit - 1);
+            UINT64 ans = num / weight;
+            if (ans < 10)
+                textout('0' + ans);
+            else
+                textout('A' + ans - 10);
+            num -= ans * weight;
+            digit--;
+        }
+    }
+}

text.h

@@ -1,6 +1,6 @@
-#include <Protocol/SimpleFileSystem.h>
 #include <Uefi.h>
 #include <Uefi/UefiSpec.h>
-// extern char keycode[];
 
 void textout(UINT8 code);
+void print(char *string);
+void printhex(UINT64 num, UINT8 digit);