Implemented custom font and text drawing in VBE graphics mode! No colors :(

Makefile

@@ -13,11 +13,13 @@ BUILD = ./build
 
 # Main compilation target
 os: $(BUILD) bootloader kernel
-	@$(AS) -fbin  -o $(BUILD)/filetable.bin $(SRC)/filetable.asm
+	@$(AS) -fbin -o $(BUILD)/filetable.bin $(SRC)/filetable.asm
+	@$(AS) -fbin -o $(BUILD)/testfont.bin $(SRC)/testfont.asm
 	@cat $(BUILD)/boot.bin $(BUILD)/filetable.bin $(BUILD)/kernel.bin > $(BUILD)/os.bin
 	@dd if=/dev/zero of=kern.iso bs=512 count=2880
 	@dd if=$(BUILD)/os.bin of=kern.iso conv=notrunc
-	@dd if=$(SRC)/fs/test.txt of=kern.iso bs=512 seek=25 conv=notrunc
+	@dd if=$(BUILD)/testfont.bin of=kern.iso bs=512 seek=25 conv=notrunc
+	@dd if=$(SRC)/fs/test.txt of=kern.iso bs=512 seek=29 conv=notrunc
 
 $(BUILD):
 	@[ -d $(BUILD) ] || mkdir $(BUILD)

README.md

@@ -14,6 +14,8 @@ Since there's always more to do, here are the [todos](todo.txt).
 - Filesystem (filetable)
 - Interactive Shell
 - Disk I/O
+- Font support (funky format)
+- 1920x1080 Resolution, 32bpp
 
 ## Building & Running
 If you want to try kern for some reason, you can.

include/isrs.h

@@ -113,11 +113,11 @@ void setupIsrs() {
 
 void faultHandler(struct regs* r) {
     if (r->intNo < 32) {
-        print(exceptionMessages[r->intNo], 0x04);
+        print(exceptionMessages[r->intNo]);
 
         if (r->errCode) { 
-            print(": 0x", 0x04);
+            print(": 0x");
-            print(itoa(r->errCode, 16), 0x04);
+            print(itoa(r->errCode, 16));
         }
 
         cli();

include/keyboard.h

@@ -49,7 +49,6 @@ uint8_t shift = 0;
 uint16_t bufferLen = 0;
 char buffer[MAX_BUFFER_SIZE + 1] = { 0 };
 bool echo = false;
-uint8_t echoAttr = 0x0f;
 bool canBackspace = false;
 
 void keyboardHandler() {
@@ -64,7 +63,7 @@ void keyboardHandler() {
     if (scancode & 0x80) { // Keyup
     } else if (c != 0) {
         if (!canBackspace && c == '\b') return;
-        if (echo) putc(c, echoAttr);
+        if (echo) putc(c);
 
         buffer[bufferLen] = c;
 
@@ -76,10 +75,9 @@ void keyboardHandler() {
     }
 }
 
-char* read(char terminator, uint8_t attr) {
+char* read(char terminator) {
     bufferLen = 0;
-    echo = attr ? true : false;
+    echo = true;
-    echoAttr = attr;
 
     while (buffer[bufferLen-1] != terminator && bufferLen < MAX_BUFFER_SIZE);
 

include/screen.h

@@ -1,138 +1,74 @@
 #ifndef SCREEN_H
 #define SCREEN_H
 
-#include "screen.h"
 #include "stdint.h"
-#include "system.h"
-#include "string.h"
 
-#define VIDMEM 0xb8000
+#define MODE_INFO_BLOCK 0x5000
-#define CURSOR_HIGH 14
+#define WIDTH 1920
-#define CURSOR_LOW 15
+#define HEIGHT 1080
-#define CTRLREG 0x3d4
+#define BG_COLOR 0xff1f2937
-#define DATAREG 0x3d5
+#define FG_COLOR 0xffd1d5db
 
-// 80x25 VGA Text mode
+struct cursor_s {
-#define ROWS 25
+    uint32_t x;
-#define COLS 80
+    uint32_t y;
-#define CHARS (ROWS*COLS)
+};
 
-uint32_t cursor = 0;
+char* font;
+uint32_t* vidmem;
+uint16_t bytesPerScanline;
 
-void updateCursor() {
+struct cursor_s cursor = { 0, 0 };
-    // Move visual cursor position
+
-    outb(0x3d4, 0x0f); // Low byte
+void setupScreen() {
-    outb(0x3d5, cursor & 0xff);
+    vidmem = *(uint32_t**)(MODE_INFO_BLOCK + 40); // Vidmem pointer location
-    outb(0x3d4, 0x0e); // High byte
+    bytesPerScanline = *(uint16_t*)(MODE_INFO_BLOCK + 16); // Bytes per scanline location
-    outb(0x3d5, cursor >> 8);
 }
 
-void setCursorPos(uint32_t offset) {
+void putcAt(char c, uint32_t x, uint32_t y) {
-    cursor = offset;
+    uint32_t offset = WIDTH * y * 16 + x * 8;
-    updateCursor();
-}
 
-uint32_t getCursorPos() {
+    char* bitmap = &font[(c-1) * 16];
-    return cursor;
+    for (uint8_t i = 0; i < 16; i++) { // Rows
-}
+        char bitmapRow = bitmap[i];
-
+        for (uint8_t j = 0; j < 8; j++) { // Cols
-uint32_t calcOffset(uint8_t col, uint8_t row) {
+            vidmem[offset + j] = (bitmapRow & 0x80) ? FG_COLOR : BG_COLOR;
-    return row * COLS + col;
+            bitmapRow = bitmapRow << 1;
-}
+        }
-
+        offset += WIDTH;
-void scroll() {
-    if (cursor < COLS * ROWS) return;
-
-    for (int i = 1; i < ROWS; i++) {
-        memcopy((char*)(calcOffset(0, i)*2)+VIDMEM, (char*)(calcOffset(0, i-1)*2)+VIDMEM, COLS*2);
     }
-
-    char* lastRow = (char*)(calcOffset(0, ROWS-1)*2)+VIDMEM;
-    for (int i = 0; i < COLS*2; i += 2) {
-        lastRow[i] = '\0';
-        lastRow[i+1] = 0x0f;
-    }
-
-    cursor = calcOffset(0, ROWS-1);
 }
 
-void putc(char c, uint8_t attr) {
+void putc(char c) {
+    putcAt(c, cursor.x, cursor.y);
+
     if (c == '\n') {
-        uint16_t line = cursor - (cursor % COLS);
+        cursor.y++;
-        setCursorPos(line + COLS);
+        cursor.x = 0;
-        scroll();
+    } else {
-        updateCursor();
+        cursor.x++;
-        return;
-    } else if (c == '\b') {
-        cursor--;
-        int mem = VIDMEM + cursor * 2;
-        *(char*)(mem) = ' ';
-        *(char*)(mem+1) = attr;
-        updateCursor();
-        return;
-    }
-    
-    int mem = VIDMEM + cursor * 2;
-    *(char*)(mem) = c;
-    *(char*)(mem+1) = attr;
-
-    cursor++;
-
-    scroll();
-    updateCursor();
-}
-
-void print(char* s, uint8_t attr) { 
-    char c = *s;
-    while (c != '\0') {
-        putc(c, attr);
-        c = *(++s);
-    }
-
-    scroll();
-    updateCursor();
-}
-
-void putcAt(char c, uint8_t attr, uint8_t col, uint8_t row) {
-    uint16_t offset = calcOffset(col, row);
-    *(char*)(VIDMEM + offset * 2) = c;
-    *(char*)(VIDMEM + offset * 2 + 1) = attr;
-}
-
-void printAt(char* s, uint8_t attr, uint8_t col, uint8_t row) {
-    uint16_t offset = calcOffset(col, row);
-    
-    char c = *s;
-    while (c != '\0') {
-        *(char*)(VIDMEM + offset * 2) = c;
-        *(char*)(VIDMEM + offset * 2 + 1) = attr;
-        c = *(++s);
-        offset++;
     }
 }
 
-void clear(uint8_t attr) {
+void print(const char* str) {
-    for (int i = 0; i < CHARS*2; i += 2) {
+    while (*str != '\0') {
-        *(char*)(VIDMEM + i) = ' ';
+        putc(*str++);
-        *(char*)(VIDMEM + i + 1) = attr;
     }
-    cursor = 0;
-
-    updateCursor();
 }
 
-void enableCursor(uint8_t start, uint8_t end) {
+void clear() {
-    outb(0x3d4, 0x0a); // Sending cursor start
+    size_t i = 0;
-    outb(0x3d5, (inb(0x3d5) & 0xc0) | start);
+    while (i < WIDTH*HEIGHT) {
+        vidmem[i] = BG_COLOR; // #1f2937
+        i++;
+    }
 
-    outb(0x3d4, 0x0b); // Sending cursor end
+    cursor.x = 0;
-    outb(0x3d5, (inb(0x3d5) & 0xe0) | end);
+    cursor.y = 0;
 }
 
-void disableCursor() {
+void loadFont(char* address) {
-    outb(0x3d4, 0x0a);
+    font = address;
-    outb(0x3d4, 0x0b);
 }
 
-
 #endif

src/filetable.asm

@@ -13,7 +13,8 @@ filetable:
     db "boot",0,0,0,0,0,0, "bin",0,0,4
     db "filetable",0,      "tab",0,4,1
     db "kernel",0,0,0,0,   "bin",0,5,20
-    db "test",0,0,0,0,0,0, "txt",0,25,1
+    db "testfont",0,0,     "fnt",0,25,4
+    db "test",0,0,0,0,0,0, "txt",0,29,1
 
 times 512-($-$$) db 0
 

src/kernel.c

@@ -10,7 +10,8 @@
 
 #define PROMPT "#> "
 
-char filetable[512];
+// TODO: Put this at a set address
+char filetable[512] = { 0 };
 
 void main() {
     // Interrupts
@@ -22,18 +23,22 @@ void main() {
     setupKeyboard();
     setupTimer();
     timerPhase(100); // 1 tick per 10ms
-    enableCursor(14, 15);
 
-    clear(0x0f);
+    // Screen setup
-    print("kern.\n\n", 0x0f);
+    diskRead(25, 4, (char*)0x6000); // Read font from disk
+    setupScreen();
+    loadFont((char*)0x6000);
+
+    clear();
+    print("kern.\n\n");
 
     diskRead(4, 1, filetable); // Read the filetable and store it in memory
 
     // Run Interactive Shell Program
     // TODO: Make it in another file
     while (1) {
-        print(PROMPT, 0x0a);
+        print(PROMPT);
-        char* input = read('\n', 0x0f);
+        char* input = read('\n');
         
         if (input[0] == '\n') continue;
 
@@ -45,14 +50,14 @@ void main() {
         *args++ = '\0'; // Separate command from args
 
         if (strcmp(input, "clear") == 0) {
-            clear(0x0f);
+            clear();
         } else if (strcmp(input, "disk") == 0) {
             char buf[512] = { 0 };
             
             if (*args == '\0') {
-                print("disk: ", 0x0f);
+                print("disk: ");
-                print("No arguments given\n", 0x0c);
+                print("No arguments given\n");
-                print("Usage: disk <r/w> <sector> [data]\n", 0x0f);
+                print("Usage: disk <r/w> <sector> [data]\n");
                 continue;
             }
 
@@ -62,30 +67,30 @@ void main() {
             
             if (mode == 'r') {
                 if (*args == '\0') {
-                    print("disk: ", 0x0f);
+                    print("disk: ");
-                    print("Sector not specified\n", 0x0c);
+                    print("Sector not specified\n");
-                    print("Usage: disk <r/w> <sector> [data]\n", 0x0f);
+                    print("Usage: disk <r/w> <sector> [data]\n");
                     continue;
                 }
 
                 uint32_t sector = atoi(args);
-                print("Reading...\n", 0x0f);
+                print("Reading...\n");
                 diskRead(sector, 1, buf);
                 
-                print("Contents:\n", 0x0f);
+                print("Contents:\n");
                 for (size_t i = 0; i < 512; i++) {
                     if (buf[i] != '\0') {
-                        putc(buf[i], 0x0f);
+                        putc(buf[i]);
                     }
                 }
 
-                putc('\n', 0x0f);
+                putc('\n');
             } else if (mode == 'w') {
                 char* data;
                 if ((data = strchr(args, ' ')) == NULL) {
-                    print("disk: ", 0x0f);
+                    print("disk: ");
-                    print("No data given\n", 0x0c);
+                    print("No data given\n");
-                    print("Usage: disk <r/w> <sector> [data]\n", 0x0f);
+                    print("Usage: disk <r/w> <sector> [data]\n");
                     continue;
                 }
 
@@ -95,28 +100,28 @@ void main() {
                 while (isSpace(*args)) { args++; } // Skip whitespace
 
                 strcpy(buf, data);
-                print("Writing...\n", 0x0f);
+                print("Writing...\n");
                 diskWrite(sector, 1, buf);
             } else { 
-                print("disk: ", 0x0f);
+                print("disk: ");
-                print("Invalid access mode. Use r(ead) or w(rite)\n", 0x0c);
+                print("Invalid access mode. Use r(ead) or w(rite)\n");
-                print("Usage: disk <r/w> <sector> [data]\n", 0x0f);
+                print("Usage: disk <r/w> <sector> [data]\n");
                 continue;
             }
         } else if (strcmp(input, "echo") == 0) {
-            print(args, 0x0f);
+            print(args);
         } else if (strcmp(input, "exit") == 0) {
             break;
         } else if (strcmp(input, "help") == 0) {
-            print("Available Commands:\n", 0x0f);
+            print("Available Commands:\n");
-            print(" clear      | Clears the screen\n", 0x0f);
+            print(" clear      | Clears the screen\n");
-            print(" disk       | Reads/Writes data from/to the disk\n", 0x0f);
+            print(" disk       | Reads/Writes data from/to the disk\n");
-            print(" echo       | Prints a message to stdout\n", 0x0f);
+            print(" echo       | Prints a message to stdout\n");
-            print(" exit       | Exits shell\n", 0x0f);
+            print(" exit       | Exits shell\n");
-            print(" help       | Prints this message\n", 0x0f);
+            print(" help       | Prints this message\n");
-            print(" ls         | Lists all available files\n", 0x0f);
+            print(" ls         | Lists all available files\n");
-            // TODO: print(" reboot     | Reboots the system\n", 0x0f);
+            print(" reboot     | Reboots the system\n");
-            print(" test       | Performs tests\n", 0x0f);
+            print(" test       | Performs tests\n");
         } else if (strcmp(input, "ls") == 0) {
             char* ft = filetable;
             
@@ -136,47 +141,49 @@ void main() {
                 uint8_t sector = *ft++;
                 uint8_t size = *ft++;
 
-                if (sector < 10) putc('0', 0x0f);
+                if (sector < 10) putc('0');
-                if (sector == 0) putc('0', 0x0f);
+                if (sector == 0) putc('0');
-                else print(itoa(sector, 10), 0x0f);
+                else print(itoa(sector, 10));
-                print(": ", 0x0f);
+                print(": ");
-                print(filename, 0x0f);
+                print(filename);
 
                 for (uint8_t i = 14 - strlen(filename); i > 0; i--) {
-                    putc(' ', 0x0f);
+                    putc(' ');
                 }
 
-                print(" | ", 0x0f);
+                print(" | ");
                 if (size >> 1) {
-                    print(itoa(size >> 1, 10), 0x0f);
+                    print(itoa(size >> 1, 10));
-                    if (size & 0x01) { print(".5", 0x0f); }
+                    if (size & 0x01) { print(".5"); }
-                    print("kB\n", 0x0f);
+                    print("kB\n");
                 } else {
-                    print(itoa(size*512, 10), 0x0f);
+                    print(itoa(size*512, 10));
-                    print("B\n", 0x0f);
+                    print("B\n");
                 }
             }
+        } else if (strcmp(input, "reboot") == 0) {
+            outb(0x64, 0xFE);
         } else if (strcmp(input, "test") == 0) {
-            print("Running Tests...\n", 0x0f);
+            print("Running Tests...\n");
             uint8_t buf[512];
             
-            print("Read Test .......... ", 0x0f);
+            print("Read Test .......... ");
             diskRead(0, 1, (char*)buf);
             if (buf[510] == 0x55 && buf[511] == 0xaa) {
-                print("[ DONE ]\n", 0x0a);
+                print("[ DONE ]\n");
             } else {
-                print("[ FAIL ]\n", 0x0c);
+                print("[ FAIL ]\n");
             }
-            print("Write Test ......... ", 0x0f);
+            print("Write Test ......... ");
             buf[510] = 0x55; buf[511] = 0xaa;
             diskWrite(0, 1, (char*)buf);
             diskRead(0, 1, (char*)buf); // Idk how else to test if the right data was written (also could break the bootloader if it fails)
             if (buf[510] == 0x55 && buf[511] == 0xaa) {
-                print("[ DONE ]\n", 0x0a);
+                print("[ DONE ]\n");
             } else {
-                print("[ FAIL ]\n", 0x0c);
+                print("[ FAIL ]\n");
             }
-            print("Tests Finished!\n", 0x0f);
+            print("Tests Finished!\n");
         } else {
             char* ft = filetable;
             uint8_t found = 0;
@@ -203,10 +210,10 @@ void main() {
 
                     for (size_t i = 0; i < size * 512; i++) {
                         if (buf[i] != '\0') {
-                            putc(buf[i], 0x0f);
+                            putc(buf[i]);
                         }
                     }
-                    putc('\n', 0x0f);
+                    putc('\n');
                     
                     found++; // Set found to 1
                     break;
@@ -216,9 +223,9 @@ void main() {
             }
 
             if (!found) {
-                print("Command not found: ", 0x0c);
+                print("Command not found: ");
-                print(input, 0x0c);
+                print(input);
-                putc('\n', 0x0f);
+                putc('\n');
             }
         }
     }

src/stage2.asm

@@ -85,6 +85,17 @@ start:
     cmp al, [modeInfoBlock.bpp]
     jne .nextMode
 
+    mov ax, [vbeInfoBlock.videoModePtr]
+    ror ax, 8
+    call printHex
+    ror ax, 8
+    call printHex
+    mov ax, [vbeInfoBlock.videoModePtr+2]
+    ror ax, 8
+    call printHex
+    ror ax, 8
+    call printHex
+
     ; Set VBE mode
     mov ax, 0x4f02
     mov bx, [mode]
@@ -104,14 +115,14 @@ start:
     jmp .findMode
     
 .endOfModes:
-    mov ax, 0x0e4e ; Print 'N'
+    mov si, modeNotFoundErr
-    int 0x10
+    call print
     cli
     hlt
 
 error:
-    mov ax, 0x0e46 ; Print 'F'
+    mov si, vbeErr
-    int 0x10
+    call print
     cli
     hlt
 
@@ -157,6 +168,23 @@ printHex:
     pop ax
     ret
 
+;;
+;; Prints a null terminated string
+;; si - pointer to string
+;;
+print:
+    push ax
+    mov ah, 0x0e
+.loop:
+    lodsb ; mov al, [si]   inc si
+    cmp al, 0
+    je .done
+    int 0x10
+    jmp .loop
+.done:
+    pop ax
+    ret
+
 ;; 32 Bit entry code
 [bits 32]
 protected_start:
@@ -172,6 +200,13 @@ protected_start:
     mov ebp, 0x90000
     mov esp, ebp
 
+    ; Store VBE Mode Info Block in memory
+    mov esi, modeInfoBlock
+    mov edi, 0x5000 ; Destination
+    mov ecx, 64 ; 64 * 4 = 256B (size of modeInfoBlock)
+
+    rep movsd
+
     ; Perform The far jump
     mov al, [driveNum]
     push ax
@@ -181,6 +216,9 @@ protected_start:
 ;; Data
 driveNum: db 0
 
+vbeErr: db "VBE Error!", 0
+modeNotFoundErr: db "VBE Mode not found!", 0
+
 ;; GDT
 GDT:
 .start:

todo.txt

@@ -1,13 +1,17 @@
 === Todo ===
 
 - [*] Multistage Bootloader
+- [ ] Write down where stuff is in memory (0x1000 - kernel, 0x2000 - filetable, 0x5000 - VBE Mode Info, 0x6000 - Font)
 - [ ] Screen
-    - [*] Scrolling
+    - [ ] Scrolling
     - [ ] Scroll-back
+    - [ ] Color codes (and just multicolor text in general)
     - [*] VESA BIOS Extensions
     - [*] Better resolution
     - [*] Graphics mode
-    - [ ] Custom font
+    - [*] Custom font
+    - [ ] Larger text size
+    - [ ] color codes
 - [ ] Filesystem
     - [ ] Utility for filesystem building (not just an assembly file)
     - [*] Filetable
@@ -40,14 +44,13 @@
         - [ ] touch (make file)
         - [ ] rm
         - [ ] mkdir (add dirs first)
-        - [ ] reboot
+        - [*] reboot
         - [ ] cd
 - [ ] Standard I/O stuff
     - [ ] stdin
     - [ ] stdout
     - [ ] stderr
     - [ ] printf
-    - [ ] color codes
 - [ ] Virtual Memory
 - [ ] Paging
 - [ ] User (or system) programs