NunoLava1998

myos.bin:     file format elf32-i386


Disassembly of section .text:

00100000 <_start-0xc>:
  100000:	02 b0 ad 1b 03 00    	add    0x31bad(%eax),%dh
  100006:	00 00                	add    %al,(%eax)
  100008:	fb                   	sti    

NunoLava1998

SMM: enter
EAX=00000001 EBX=0000000b ECX=02000000 EDX=02000628
ESI=00000000 EDI=02000000 EBP=07fab7b0 ESP=00006d2c
EIP=000ee54b EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00cf9b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]

NunoLava1998

#include "../defs.h"

void* memmove(void* dstptr, const void* srcptr, size_t size) {
	unsigned char* dst = (unsigned char*) dstptr;
	const unsigned char* src = (const unsigned char*) srcptr;
	if (dst < src) {
		for (size_t i = 0; i < size; i++)
			dst[i] = src[i];
	} else {
		for (size_t i = size; i != 0; i--)

NunoLava1998

#include "../defs.h"

void run(void) {
	int* val = (int *)malloc(128);
	if (val == 0) {
		if ((const char*)command == (const char*)"ver") {
			y++;
			x = 0;
			terminal_writestring("Dixium OS v1.1 alpha", WHITE, BLACK, x, y);
			y++;

NunoLava1998

// Beacuse we don't want to include any files, we'll have
// to predefine it here, then actually define it. 

size_t strlen(const char* str);
void update_videoptr(void);
void newline(void);
void restrictions_tty(char c);
void writec(char c, uint8_t bc, uint8_t fc);
void writes(const char* c, uint8_t bc, uint8_t fc);

NunoLava1998

// Beacuse we don't want to include any files, we'll have
// to predefine it here, then actually define it. 

size_t strlen(const char* str);
void update_videoptr(void);
void newline(void);
void backspace(void);
void restrictions_tty(void);
void writec(char c, uint8_t bc, uint8_t fc);

NunoLava1998

typedef bit unsigned char;

struct gdt_table {
	uint16_t limit_low;
	uint16_t base_low;
	uint8_t base_medium;
	bit accessed_bit; // Often set as uint8_t access_byte
	bit read_write_bit; // Often set as uint8_t access_byte
	bit direction_bit; // Often set as uint8_t access_byte

NunoLava1998

struct gdt_table {
	uint16_t limit_low;
	uint16_t base_low;
	uint8_t base_medium;
	uint8_t access_byte;
	uint8_t limit_high << 4;
	uint8_t flags << 4;
	uint8_t base_high;

NunoLava1998

// Warning to viewers: This is a .h file with code, beacuse we are basically including from a .c file, so this will be in the same format as .c,
// and the WhyToNotPutCodeInHeaderFiles will not apply.



struct gdt_table {
	uint16_t limit_low;
	uint16_t base_low;
	uint8_t base_medium;
	uint8_t access;

NunoLava1998

.extern gdtp
.global lgdt

lgdt:
	lgdt gdtp
	mov $0x10, %eax
	mov %ds, %eax
	mov %es, %eax
	mov %fs, %eax
	mov %gs, %eax