Using framebuffer info for putpixel loop instead of hardcoded values

(never expect Multiboot to give you what you want!)

src/kernel.c

@@ -59,12 +59,20 @@ void kmain (unsigned int mbootmagick, multiboot_info_t* mbootinfo) {
 	serial_write_string("\n  BPos:");
 	serial_write_string(itoa(mbootinfo->framebuffer_blue_field_position, 10));
 
+	serial_write_string("\nMemory: ");
+	serial_write_string("\n  lower: ");
+	serial_write_string(uitoa(mbootinfo->mem_lower, 10));
+	serial_write_string(" k");
+	serial_write_string("\n  upper: ");
+	serial_write_string(uitoa(mbootinfo->mem_upper/1024, 10));
+	serial_write_string(" M");
+
 	initfb(mbootinfo->framebuffer_addr, mbootinfo->framebuffer_width, mbootinfo->framebuffer_height, mbootinfo->framebuffer_bpp, mbootinfo->framebuffer_pitch, mbootinfo->framebuffer_red_field_position, mbootinfo->framebuffer_green_field_position, mbootinfo->framebuffer_blue_field_position);
 	int x, y, i;
 	unsigned char c = 0;
 	for(;;) {
-		for(y=0;y<768;y++) {
-			for(x=0;x<1024;x++) {
+		for(y=0; y < mbootinfo->framebuffer_height; y++) {
+			for(x=0; x < mbootinfo->framebuffer_width; x++) {
 				putpixel(x, y, c, c, c, 0xff);
 			}
 		}

src/start32.asm

@@ -9,7 +9,7 @@ MULTIBOOT_HEADER_MAGIC      equ 0x1BADB002
 MULTIBOOT_HEADER_FLAGS      equ MULTIBOOT_PAGE_ALIGN or MULTIBOOT_MEMORY_INFO or MULTIBOOT_VIDEO_REQUEST
 MULTIBOOT_CHECKSUM          equ -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
 
-.multiboot: align 4
+section '.multiboot' align 4
 	dd MULTIBOOT_HEADER_MAGIC
 	dd MULTIBOOT_HEADER_FLAGS
 	dd MULTIBOOT_CHECKSUM