itos

.gitignore

@@ -3,4 +3,4 @@ CMakeCache.txt
 Makefile
 cmake_install.cmake
 .vscode/
-./OwOS.bin
+.vs/

kernel.cpp

@@ -1,12 +1,37 @@
+#include <lib/std/stdlib.h>
+#include <kernel/multiboot.h>
 #include <kernel/drivers/terminal/terminal.h>
 
 extern "C"
 
-int kernel_main() {
+int kernel_main(uint32_t magic, multibootInfo_t* multiboot) {
 
     cls();
     showCursor();
     
+	write("OwOS ");
+	setFGColour(VGA_GREEN);
+	write("Starting Up...");
+	setFGColour(VGA_WHITE);
+
+	nline();
+
+	write("OwO, What's This? ");
+	write("*notices ");
+	
+	char* ram = "";
+	itoa((int)multiboot->mem_upper, ram);
+
+	write(ram);
+	write("mb of ram*");
+	setFGColour(VGA_BRIGHT_MAGENTA);
+	write(" OwO That's a lot of memory");
+	setFGColour(VGA_WHITE);
+	nline();
+	nline();
+	nline();
+
+
     writeln("Okay, this is pretty epic");
 
     for (;;)

kernel/drivers/terminal/terminal.cpp

@@ -1,6 +1,7 @@
 #include "terminal.h"
 
 #include <kernel/kernio.h>
+#include <lib/std/string.h>
 
 static const int TERMINAL_WIDTH = 80;
 static const int TERMINAL_HEIGHT = 24;
@@ -41,6 +42,12 @@ void puts(int x, int y, char c, char foreground, char background) {
     frameBuffer[(y * TERMINAL_WIDTH) + x].background = background;
 }
 
+void nline() {
+    cursor.y++;
+    cursor.x = 0;
+    updateCursor(cursor);
+}
+
 void write(char* input) {
 	for (uint32_t i = 0; i < strlen(input); i++) {
 		if (cursor.x + 1 > TERMINAL_WIDTH) {
@@ -48,7 +55,8 @@ void write(char* input) {
 		}
 		if (input[i] == '\n') {
 			nline();
-        } else {
+		}
+		else {
 			puts(cursor.x, cursor.y, input[i], fgColour, bgColour);
 			cursor.x++;
 		}
@@ -61,12 +69,6 @@ void writeln(char* input) {
 	nline();
 }
 
-void nline() {
-    cursor.y++;
-    cursor.x = 0;
-    updateCursor(cursor);
-}
-
 void setClearColour(char col) {
     clearColour = col;
 }

kernel/drivers/terminal/terminal.h

@@ -1,4 +1,5 @@
-#include <lib/std/string.h>
+#pragma once
+
 #include <lib/stdint.h>
 
 enum {
@@ -36,11 +37,11 @@ void cls();
 void puts(char input);
 void puts(int x, int y, char c, char foreground, char background);
 
+void nline();
+
 void write(char* input);
 void writeln(char* input);
 
-void nline();
-
 void setClearColour(char col);
 void setFGColour(char col);
 void setBGColour(char col);

kernel/kernio.h

@@ -1,3 +1,5 @@
+#pragma once
+
 #include <lib/stdint.h>
 
 inline void outb(uint16_t port, uint8_t b) {

kernel/multiboot.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <lib/stdint.h>
+
+// Totally stolen from here https://forum.osdev.org/viewtopic.php?f=1&t=8881
+struct multibootInfo_t {
+    uint32_t flags;
+    uint32_t mem_lower;
+    uint32_t mem_upper;
+    uint32_t boot_devices;
+    uint32_t cmdline;
+    uint32_t mods_count;
+    uint32_t mods_addr;
+    uint32_t syms_num;
+    uint32_t syms_size;
+    uint32_t syms_addr;
+    uint32_t syms_shndx;
+    uint32_t mmap_length;
+    uint32_t mmap_addr;
+    uint32_t drives_length;
+    uint32_t drives_addr;
+    uint32_t config_table;
+    char boot_loader_name[4];
+    uint32_t apm_table;
+    uint32_t vbe_control_info;
+    uint32_t vbe_mode_info;
+    uint16_t vbe_mode;
+    uint16_t vbe_interface_seg;
+    uint16_t vbe_interface_off;
+    uint16_t vbe_interface_len;
+    uint64_t framebuffer_addr;
+    uint32_t framebuffer_pitch;
+    uint32_t framebuffer_width;
+    uint32_t framebuffer_height;
+};

lib/std/memory.cpp

@@ -27,7 +27,7 @@ void* memmove(void* dst, const void* src, uint32_t size) {
 		for (uint32_t i = 0; i < size; i++)
 			d[i] = s[i];
 	else
-		for (uint32_t i = size; i--; )
+		for (uint32_t i = size; --i; )
 			d[i-1] = s[i-1];
 	return dst;
 }

lib/std/memory.h

@@ -1,3 +1,5 @@
+#pragma once 
+
 #include <lib/stdint.h>
 
 bool  memcmp(const void* a, const void* b, uint32_t size);

lib/std/stdlib.cpp

@@ -0,0 +1,37 @@
+#include "stdlib.h"
+
+#include "string.h"
+
+void swap(int* x, int* y) {
+	int* t = x;
+	x = y;
+	y = t;
+}
+
+void reverse(char s[]) {
+	int i;
+	int j = strlen(s) - 1;
+	char c;
+
+	for (i = 0; i < j; i++) {
+		j--;
+		c = s[i];
+		s[i] = s[j];
+		s[j] = c;
+	}
+}
+
+void itoa(int i, char[] s) {
+	int i, sign;
+
+	if ((sign = n) < 0)  /* record sign */
+		n = -n;          /* make n positive */
+	i = 0;
+	do {       /* generate digits in reverse order */
+		s[i++] = n % 10 + '0';   /* get next digit */
+	} while ((n /= 10) > 0);     /* delete it */
+	if (sign < 0)
+		s[i++] = '-';
+	s[i] = '\0';
+	reverse(s);
+}

lib/std/stdlib.h

@@ -0,0 +1,5 @@
+#pragma once 
+
+void swap(int* a, int* b);
+void reverse(char s[])
+void itoa(int i, char[] s);

lib/std/string.h

@@ -1,3 +1,5 @@
+#pragma once 
+
 #include <lib/stdint.h>
 
 uint32_t strlen(char* str);