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This commit is contained in:
Tyler McGurrin 2024-12-17 19:01:55 -05:00
parent d1083b4afe
commit a0325af23a
11 changed files with 510 additions and 143 deletions
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3
Makefile
View File

@ -17,7 +17,8 @@ $(BUILD_DIR)/main_floppy.img: bootloader kernel
mkfs.fat -F 12 -n "NANITE" $(BUILD_DIR)/main_floppy.img
dd if=$(BUILD_DIR)/stage1.bin of=$(BUILD_DIR)/main_floppy.img conv=notrunc
mcopy -i $(BUILD_DIR)/main_floppy.img $(BUILD_DIR)/stage2.bin "::stage2.bin"
mcopy -i $(BUILD_DIR)/main_floppy.img $(BUILD_DIR)/kernel.bin "::kernel.bin"
mmd -i $(BUILD_DIR)/main_floppy.img "::boot"
mcopy -i $(BUILD_DIR)/main_floppy.img $(BUILD_DIR)/kernel.bin "::boot/kernel.bin"
mmd -i $(BUILD_DIR)/main_floppy.img "::misc"
mcopy -i $(BUILD_DIR)/main_floppy.img test.txt "::misc/test.txt"

10
src/bootloader/stage2/disk.c
View File

@ -15,8 +15,8 @@ bool DISK_Initialize(DISK* disk, uint8_t driveNumber) {
return false;
disk->id = driveNumber;
disk->cylinders = cylinders + 1;
disk->heads = heads + 1;
disk->cylinders = cylinders;
disk->heads = heads;
disk->sectors = sectors;
return true;
@ -31,6 +31,8 @@ void DISK_LBA2CHS(DISK* disk, uint32_t lba, uint16_t* cylinderOut, uint16_t* sec
// head = (LBA / sects per track % heads)
*headOut = (lba / disk->sectors) % disk->heads;
// printf("LBA2CHS: lba=%u sect=%u cyl=%u head=%u disk_sectors=%u disk_heads=%u\n", lba, *sectorOut, *cylinderOut, *headOut, disk->sectors, disk->heads);
}
bool DISK_ReadSectors(DISK* disk, uint32_t lba, uint8_t sectors, void* dataOut) {
@ -38,9 +40,11 @@ bool DISK_ReadSectors(DISK* disk, uint32_t lba, uint8_t sectors, void* dataOut)
DISK_LBA2CHS(disk, lba, &cylinder, &sector, &head);
for (int i = 0; i < 3; i++) {
for (int i = 0; i < 3; i++)
{
if (x86_Disk_Read(disk->id, cylinder, sector, head, sectors, dataOut))
return true;
x86_Disk_Reset(disk->id);
}

103
src/bootloader/stage2/fat.c
View File

@ -17,53 +17,58 @@
#define MAX_FILE_HANDLES 10
#define ROOT_DIRECTORY_HANDLE -1
typedef struct
typedef struct
{
uint8_t BootJumpInstruction[3];
uint8_t OemIdentifier[8];
uint16_t BytesPerSector;
uint8_t SectorsPerCluster;
uint16_t ReservedSectors;
uint8_t FatCount;
uint16_t DirEntryCount;
uint16_t TotalSectors;
uint8_t MediaDescriptorType;
uint16_t SectorsPerFat;
uint16_t SectorsPerTrack;
uint16_t Heads;
uint32_t HiddenSectors;
uint32_t LargeSectorCount;
//Extended Boot Record
uint8_t DriveNumber;
uint8_t _Reserved;
uint8_t Signature;
uint32_t VolumeId; //Serial Can be whatever
uint8_t VolumeLabel[11]; //11 Bytes MUST Be padded with spaces!
uint8_t SystemId[8]; //8 Bytes padded with spaces (use MSWIN4.1 for best compatibility!)
uint8_t BootJumpInstruction[3];
uint8_t OemIdentifier[8];
uint16_t BytesPerSector;
uint8_t SectorsPerCluster;
uint16_t ReservedSectors;
uint8_t FatCount;
uint16_t DirEntryCount;
uint16_t TotalSectors;
uint8_t MediaDescriptorType;
uint16_t SectorsPerFat;
uint16_t SectorsPerTrack;
uint16_t Heads;
uint32_t HiddenSectors;
uint32_t LargeSectorCount;
// extended boot record
uint8_t DriveNumber;
uint8_t _Reserved;
uint8_t Signature;
uint32_t VolumeId; // serial number, value doesn't matter
uint8_t VolumeLabel[11]; // 11 bytes, padded with spaces
uint8_t SystemId[8];
// ... we don't care about code ...
} __attribute__((packed)) FAT_BootSector;
typedef struct {
FAT_File Public;
bool Opened;
uint32_t FirstCluster;
uint32_t CurrentCluster;
uint32_t CurrentSectorInCluster;
uint8_t Buffer[SECTOR_SIZE];
} __attribute__((packed)) FAT_FileData;
typedef struct
{
uint8_t Buffer[SECTOR_SIZE];
FAT_File Public;
bool Opened;
uint32_t FirstCluster;
uint32_t CurrentCluster;
uint32_t CurrentSectorInCluster;
} FAT_FileData;
typedef struct {
union {
FAT_BootSector BootSector;
uint8_t BootSectorBytes[SECTOR_SIZE];
} BS;
typedef struct
{
union
{
FAT_BootSector BootSector;
uint8_t BootSectorBytes[SECTOR_SIZE];
} BS;
FAT_FileData RootDirectory;
FAT_FileData RootDirectory;
FAT_FileData OpenedFiles[MAX_FILE_HANDLES];
FAT_FileData OpenedFiles[MAX_FILE_HANDLES];
} FAT_Data;
@ -131,7 +136,7 @@ bool FAT_Initialize(DISK* disk) {
}
uint32_t FAT_ClusterToLba(uint32_t cluster) {
return g_DataSectionLba + (cluster -2) * g_Data->BS.BootSector.SectorsPerCluster;
return g_DataSectionLba + (cluster - 2) * g_Data->BS.BootSector.SectorsPerCluster;
}
FAT_File* FAT_OpenEntry(DISK* disk, FAT_DirectoryEntry* entry) {
@ -158,7 +163,10 @@ FAT_File* FAT_OpenEntry(DISK* disk, FAT_DirectoryEntry* entry) {
fd->CurrentSectorInCluster = 0;
if (!DISK_ReadSectors(disk, FAT_ClusterToLba(fd->CurrentCluster), 1, fd->Buffer)) {
printf("FAT: Read Error!\r\n");
printf("FAT: Failed to Open Entry, Read Error!\nCluster Is: %u\n", fd->CurrentCluster);
for (int i = 0; i < 11; i++)
printf("%c", entry->Name[i]);
printf("\n");
return false;
}
@ -184,7 +192,7 @@ uint32_t FAT_Read(DISK* disk, FAT_File* file, uint32_t byteCount, void* dataOut)
uint8_t* u8DataOut = (uint8_t*)dataOut;
// don't read past EOF
if (!fd->Public.IsDirectory)
if (!fd->Public.IsDirectory || (fd->Public.IsDirectory && fd->Public.Size != 0))
byteCount = min(byteCount, fd->Public.Size - fd->Public.Position);
while (byteCount > 0) {
@ -211,7 +219,7 @@ uint32_t FAT_Read(DISK* disk, FAT_File* file, uint32_t byteCount, void* dataOut)
if (++fd->CurrentSectorInCluster >= g_Data->BS.BootSector.SectorsPerCluster) {
// calc next cluster & sect. to read
fd->CurrentSectorInCluster = 0;
fd->CurrentCluster = FAT_NextCluster;
fd->CurrentCluster = FAT_NextCluster(fd->CurrentCluster);
}
if (fd->CurrentCluster >= 0x0FF8) {
// mark EOF
@ -251,16 +259,23 @@ bool FAT_FindFile(DISK* disk, FAT_File* file, const char* name, FAT_DirectoryEnt
// convert from name to fat name
memset(fatName, ' ', sizeof(fatName));
fatName[11] + '\0';
const char* ext = strchr(name, '.');
if (ext == NULL)
ext = name + 11;
for (int i = 0; i < 8 && name[i] && name + i < ext; i++)
fatName[i] = toupper(name[i]);
if (ext != NULL) {
if (ext != name + 11) {
for (int i = 0; i < 3 && ext[i + 1]; i++)
fatName[i + 8] = toupper(ext[i + 1]);
}
while (FAT_ReadEntry(disk, file, &entry)) {
// for (int i = 0; i < 11; i++)
// printf("%c", fatName);
// for (int i = 0; i < 11; i++)
// printf("%c", entry.Name[i]);
if (memcmp(fatName, entry.Name, 11) == 0) {
*entryOut = entry;
return true;

78
src/bootloader/stage2/main.c
View File

@ -7,9 +7,9 @@
#include "stdio.h"
#include "x86.h"
#include "disk.h"
// #include "fat.h"
#include "fat.h"
#define LOGO " _ _____ _ __________________\n / | / / | / | / / _/_ __/ ____/\n / |/ / /| | / |/ // / / / / __/ \n / /| / ___ |/ /| // / / / / /___ \n\\/_/ |_/_/ |_/_/ |_/___/ /_/ /_____/ \n"
#define LOGO " _ _____ _ __________________\n / | / / | / | / / _/_ __/ ____/\n / |/ / /| | / |/ // / / / / __/ \n / /| / ___ |/ /| // / / / / /___ \n/_/ |_/_/ |_/_/ |_/___/ /_/ /_____/ \n"
#define VERSION "v0.0.1"
void* g_data = (void*)0x20000;
@ -25,7 +25,7 @@ void* g_data = (void*)0x20000;
// Clear screen and Print Startup logo
clrscr();
printf("%s", LOGO);
printf(" %s\n--------------------------------------\n", VERSION);
printf("The Nano OS %s\n-------------------------------------\n", VERSION);
// Test Real Mode
printf("Testing Real Mode...");
@ -44,47 +44,49 @@ void* g_data = (void*)0x20000;
printf("Initializing Disk...");
DISK disk;
if (!DISK_Initialize(&disk, bootDrive)) {
printf("Failed!\nDisk Initialization Error\n");
printf("Failed!\nDisk Initialization Error!\n");
goto end;
}
printf("Done!\n");
DISK_ReadSectors(&disk, 0, 1, g_data);
print_buffer("> Boot Sector Data: ", g_data, 512);
// print_buffer("> Boot Sector Data: ", g_data, 512);
// printf("Initializing FAT Driver...");
// if (!FAT_Initialize(&disk)) {
// printf("Failed!\nDisk Initialization Error\n");
// goto end;
// }
// printf("Done!\n");
// // printf("Listing Root DIR...\n");
// // // browse files in root
// FAT_File far* fd = FAT_Open(&disk, "/");
// FAT_DirectoryEntry entry;
// int i = 0;
// // while (FAT_ReadEntry(&disk, fd, &entry) && i++ < 5) {
// // printf(" ");
// // for (int i = 0; i < 11; i++)
// // putc(entry.Name[i]);
// // printf("\n");
// // }
// // FAT_Close(fd);
printf("Initializing FAT Driver...");
if (!FAT_Initialize(&disk)) {
printf("Failed!\nDisk Initialization Error!\n");
goto end;
}
printf("Done!\n");
// printf("Listing Root DIR...\n");
// // browse files in root
FAT_File* fd = FAT_Open(&disk, "/");
FAT_DirectoryEntry entry;
int i = 0;
// while (FAT_ReadEntry(&disk, fd, &entry) && i++ < 5) {
// printf(" ");
// for (int i = 0; i < 11; i++)
// putc(entry.Name[i]);
// printf("\n");
// }
// FAT_Close(fd);
// printf("Testing FAT Driver...");
// // read test.txt
// char buffer[100];
// uint32_t read;
// fd = FAT_Open(&disk, "misc/test.txt");
// while ((read = FAT_Read(&disk, fd, sizeof(buffer), buffer)))
// {
// for (uint32_t i = 0; i < read; i++)
// {
// if (buffer[i] == '\n')
// putc('');
// putc(buffer[i]);
// }
// }
// FAT_Close(fd);
printf("Testing FAT Driver...");
// read test.txt
char buffer[100];
uint32_t read;
fd = FAT_Open(&disk, "misc/test.txt");
while ((read = FAT_Read(&disk, fd, sizeof(buffer), buffer)))
{
for (uint32_t i = 0; i < read; i++)
{
if (buffer[i] == '\n')
putc('\r');
putc(buffer[i]);
}
}
FAT_Close(fd);
printf("Loading Kernel...");
end:
for (;;);

30
src/kernel/Makefile
View File

@ -1,14 +1,32 @@
BUILD_DIR?=build/
ASM?=nasm
TARGET_ASMFLAGS += -f elf
TARGET_CFLAGS += -ffreestanding -nostdlib
TARGET_LIBS += -lgcc
TARGET_LINKFLAGS += -T linker.ld -nostdlib
.PHONY: all kernel clean
SOURCES_C=$(wildcard *.c)
SOURCES_ASM=$(wildcard *.asm)
OBJECTS_C=$(patsubst %.c, $(BUILD_DIR)/kernel/c/%.obj, $(SOURCES_C))
OBJECTS_ASM=$(patsubst %.asm, $(BUILD_DIR)/kernel/asm/%.obj, $(SOURCES_ASM))
.PHONY: all kernel clean always
all: kernel
kernel: $(BUILD_DIR)/kernel.bin
$(BUILD_DIR)/kernel.bin:
$(ASM) main.asm -f bin -o $(BUILD_DIR)/kernel.bin
$(BUILD_DIR)/kernel.bin: $(OBJECTS_ASM) $(OBJECTS_C)
$(TARGET_LD) $(TARGET_LINKFLAGS) -Wl,-Map=$(BUILD_DIR)/kernel.map -o $@ $^ $(TARGET_LIBS)
$(BUILD_DIR)/kernel/c/%.obj: %.c always
$(TARGET_CC) $(TARGET_CFLAGS) -c -o $@ $<
$(BUILD_DIR)/kernel/asm/%.obj: %.asm always
$(TARGET_ASM) $(TARGET_ASMFLAGS) -o $@ $<
always:
mkdir -p $(BUILD_DIR)/kernel/c
mkdir -p $(BUILD_DIR)/kernel/asm
clean:
rm -f $(BUILD_DIR)/kernel.bin
rm -f $(BUILD_DIR)/kernel.bin

15
src/kernel/linker.ld Normal file
View File

@ -0,0 +1,15 @@
ENTRY(entry)
OUTPUT_FORMAT("binary")
phys = 0x000100000;
SECTIONS {
. = phys;
.entry : { __entry_start = .; *(.entry) }
.text : { __text_start = .; *(.text) }
.data : { __data_start = .; *(.data) }
.rodata : { __rodata_start = .; *(.rodata) }
.bss : { __bss_start = .; *(.bss) }
__end = .;
}

50
src/kernel/main.asm
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@ -1,50 +0,0 @@
;/////////////////////;
;Nanite OS ;
;COPYRIGHT (C) 2024 ;
;Tyler McGurrin ;
;/////////////////////;
org 0x0
bits 16
%define ENDL 0x0D, 0x0A
start:
; print hello world message
mov si, msg_hello
call puts
.halt:
cli
hlt
;
; Prints a string to the screen
; Params:
; - ds:si points to string
;
puts:
; save registers we will modify
push si
push ax
push bx
.loop:
lodsb ; loads next character in al
or al, al ; verify if next character is null?
jz .done
mov ah, 0x0E ; call bios interrupt
mov bh, 0 ; set page number to 0
int 0x10
jmp .loop
.done:
pop bx
pop ax
pop si
ret
msg_hello: db 'Loading Kernel...', ENDL, 0

31
src/kernel/main.c Normal file
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@ -0,0 +1,31 @@
/*----------------*\
|Nanite OS |
|Copyright (C) 2024|
|Tyler McGurrin |
\*----------------*/
#include <stdint.h>
#include "stdio.h"
#include "x86.h"
#include "disk.h"
#include "fat.h"
#define LOGO " _ _____ _ __________________\n / | / / | / | / / _/_ __/ ____/\n / |/ / /| | / |/ // / / / / __/ \n / /| / ___ |/ /| // / / / / /___ \n/_/ |_/_/ |_/_/ |_/___/ /_/ /_____/ \n"
#define VERSION "v0.0.1"
void* g_data = (void*)0x20000;
void puts_realmode(const char* str) {
while (*str) {
x86_realmode_putc(*str);
++str;
}
}
void __attribute__((cdecl)) start(uint16_t bootDrive) {
printf("Done!\n"); // done msg for load kernel (LEAVE HERE)
end:
for (;;);
}

318
src/kernel/stdio.c Normal file
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@ -0,0 +1,318 @@
/*----------------*\
|Nanite OS |
|Copyright (C) 2024|
|Tyler McGurrin |
\*----------------*/
#include "stdio.h"
#include "x86.h"
#include <stdarg.h>
#include <stdbool.h>
const unsigned SCREEN_WIDTH = 80;
const unsigned SCREEN_HEIGHT = 25;
const uint8_t DEFAULT_COLOUR = 0x7;
uint8_t* g_ScreenBuffer = (uint8_t*)0xB8000;
int g_ScreenX = 0, g_ScreenY = 0;
void putchr(int x, int y, char c)
{
g_ScreenBuffer[2 * (y * SCREEN_WIDTH + x)] = c;
}
void putcolour(int x, int y, uint8_t colour)
{
g_ScreenBuffer[2 * (y * SCREEN_WIDTH + x) + 1] = colour;
}
char getchr(int x, int y)
{
return g_ScreenBuffer[2 * (y * SCREEN_WIDTH + x)];
}
uint8_t getcolour(int x, int y)
{
return g_ScreenBuffer[2 * (y * SCREEN_WIDTH + x) + 1];
}
void setcursor(int x, int y)
{
int pos = y * SCREEN_WIDTH + x;
x86_outb(0x3D4, 0x0F);
x86_outb(0x3D5, (uint8_t)(pos & 0xFF));
x86_outb(0x3D4, 0x0E);
x86_outb(0x3D5, (uint8_t)((pos >> 8) & 0xFF));
}
void clrscr()
{
for (int y = 0; y < SCREEN_HEIGHT; y++)
for (int x = 0; x < SCREEN_WIDTH; x++)
{
putchr(x, y, '\0');
putcolour(x, y, DEFAULT_COLOUR);
}
g_ScreenX =0; g_ScreenY = 0;
setcursor(g_ScreenX, g_ScreenY);
}
void scrollback(int lines)
{
for (int y = lines; y < SCREEN_HEIGHT; y++)
for (int x = 0; x < SCREEN_WIDTH; x++)
{
putchr(x, y - lines, getchr(x, y));
putcolour(x, y - lines, getcolour(x, y));
}
for (int y= SCREEN_HEIGHT - lines; y < SCREEN_HEIGHT; y++)
for (int x = 0; x < SCREEN_WIDTH; x++)
{
putchr(x, y - lines, getchr(x, y));
putcolour(x, y - lines, getcolour(x, y));
}
g_ScreenY -= lines;
}
void putc(char c)
{
switch (c)
{
case '\n':
g_ScreenX = 0;
g_ScreenY++;
break;
case '\t':
for (int i = 0; i < 4 - (g_ScreenX % 4); i++)
putc(' ');
break;
case '\r':
g_ScreenX = 0;
break;
default:
putchr(g_ScreenX, g_ScreenY, c);
g_ScreenX++;
break;
}
if (g_ScreenX >= SCREEN_WIDTH)
{
g_ScreenY++;
g_ScreenX = 0;
}
if (g_ScreenY >= SCREEN_HEIGHT)
scrollback(1);
setcursor(g_ScreenX, g_ScreenY);
}
void puts(const char* str)
{
while(*str)
{
putc(*str);
str++;
}
}
const char g_HexChars[] = "0123456789abcdef";
void printf_unsigned(unsigned long long number, int radix)
{
char buffer[32];
int pos = 0;
//number to ASCII conversion
do {
unsigned long long rem = number % radix;
number /= radix;
buffer[pos++] = g_HexChars[rem];
} while (number > 0);
//print number in reverse order
while (--pos >= 0)
putc(buffer[pos]);
}
void printf_signed(long long number, int radix)
{
if (number < 0)
{
putc('-');
printf_unsigned(-number, radix);
}
else printf_unsigned(number, radix);
}
#define PRINTF_STATE_NORMAL 0
#define PRINTF_STATE_LENGTH 1
#define PRINTF_STATE_LENGTH_SHORT 2
#define PRINTF_STATE_LENGTH_LONG 3
#define PRINTF_STATE_SPEC 4
#define PRINTF_LENGTH_DEFAULT 0
#define PRINTF_LENGTH_SHORT_SHORT 1
#define PRINTF_LENGTH_SHORT 2
#define PRINTF_LENGTH_LONG 3
#define PRINTF_LENGTH_LONG_LONG 4
void printf(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
int state= PRINTF_STATE_NORMAL;
int length = PRINTF_LENGTH_DEFAULT;
int radix = 10;
bool sign = false;
bool number = false;
while (*fmt)
{
switch (state)
{
case PRINTF_STATE_NORMAL:
switch (*fmt)
{
case '%': state = PRINTF_STATE_LENGTH;
break;
default: putc(*fmt);
break;
}
break;
case PRINTF_STATE_LENGTH:
switch (*fmt)
{
case 'h': length = PRINTF_LENGTH_SHORT;
state = PRINTF_STATE_LENGTH_SHORT;
break;
case 'l': length = PRINTF_LENGTH_LONG;
state = PRINTF_STATE_LENGTH_LONG;
break;
default: goto PRINTF_STATE_SPEC_;
}
break;
case PRINTF_STATE_LENGTH_SHORT:
if (*fmt == 'h')
{
length = PRINTF_LENGTH_SHORT_SHORT;
state = PRINTF_STATE_SPEC;
}
else goto PRINTF_STATE_SPEC_;
break;
case PRINTF_STATE_LENGTH_LONG:
if (*fmt == 'h')
{
length = PRINTF_LENGTH_LONG_LONG;
state = PRINTF_STATE_SPEC;
}
else goto PRINTF_STATE_SPEC_;
break;
case PRINTF_STATE_SPEC:
PRINTF_STATE_SPEC_:
switch (*fmt)
{
case 'c': putc((char)va_arg(args, int));
break;
case 's': puts(va_arg(args, const char*));
break;
case '%': putc('%');
break;
case 'd':
case 'i': radix = 10;
sign = true;
number = true;
break;
case 'u': radix = 10; sign = false; number = true;
break;
case 'X':
case 'x':
case 'p': radix = 16; sign = false; number = true;
break;
case 'o': radix = 8; sign = false; number = true;
break;
//ignore invalid specifiers (specs)
default: break;
}
if (number)
{
if (sign)
{
switch (length)
{
case PRINTF_LENGTH_SHORT_SHORT:
case PRINTF_LENGTH_SHORT:
case PRINTF_LENGTH_DEFAULT:
printf_signed(va_arg(args, int), radix);
break;
case PRINTF_LENGTH_LONG:
printf_signed(va_arg(args, long), radix);
break;
case PRINTF_LENGTH_LONG_LONG:
printf_signed(va_arg(args, long long), radix);
break;
}
}
else
{
switch (length)
{
case PRINTF_LENGTH_SHORT_SHORT:
case PRINTF_LENGTH_SHORT:
case PRINTF_LENGTH_DEFAULT:
printf_unsigned(va_arg(args, unsigned int), radix);
break;
case PRINTF_LENGTH_LONG:
printf_unsigned(va_arg(args, unsigned long), radix);
break;
case PRINTF_LENGTH_LONG_LONG:
printf_unsigned(va_arg(args, unsigned long long), radix);
break;
}
}
}
//reset state
state = PRINTF_STATE_NORMAL;
length = PRINTF_LENGTH_DEFAULT;
radix = 10;
sign = false;
break;
}
fmt++;
}
va_end(args);
}
void print_buffer(const char* msg, const void* buffer, uint32_t count)
{
const uint8_t* u8Buffer = (const uint8_t*)buffer;
puts(msg);
for (uint16_t i = 0; i < count; i++)
{
putc(g_HexChars[u8Buffer[i] >> 4]);
putc(g_HexChars[u8Buffer[i] & 0xF]);
}
puts("\n");
}

13
src/kernel/stdio.h Normal file
View File

@ -0,0 +1,13 @@
/*----------------*\
|Nanite OS |
|Copyright (C) 2024|
|Tyler McGurrin |
\*----------------*/
#pragma once
#include <stdint.h>
void clrscr();
void putc(char c);
void puts(const char* str);
void printf(const char* fmt, ...);
void print_buffer(const char* msg, const void* buffer, uint32_t count);

2
test.txt
View File

@ -1 +1 @@
Done!
Ok!