好了先是晒图吧
这里只晒代码了，编译方法和环境搭建过程还是请参考我之前的文章好了，不过觉得自己还真的是切换到了图形模式，只是不懂得怎样调色，还请高手回复帮忙吧(有很多的代码是没有用到的，只是懒得删除罢了！kernel.c就只是从https://www.gnu.org/software/grub/manual/multiboot2/multiboot.html#Examples粘贴过来的，蓝色的部分真正的改正过，也是关键的部分，其余大家可以不看)。multiboot2.h从网站上下载。
boot.s
.extern _kernel_main, _string
.global _put_char
_start:
jmp _begin
.align 8
header_start:
.int 0xe85250d6
.int 0x0
.int header_end - header_start
.int -(0xe85250d6 + 0x0 + (header_end - header_start))
add_tag_start:
.word 0x2
.word 0x0
.int add_tag_end - add_tag_start
.int header_start
.int _start
.int 0x0
.int 0x0
add_tag_end:
entry_add_tag_start:
.word 0x3
.word 0x1
.int entry_add_tag_end - entry_add_tag_start
.int _begin
entry_add_tag_end:
.align 8
framebuffer_tag_start:
.short 0x5
.short 0x1
.long framebuffer_tag_end - framebuffer_tag_start
.long 1024
.long 768
.long 32
framebuffer_tag_end:
.align 8
.word 0x0
.word 0
.int 8
header_end:
.align 8
_begin:
mov $stack_start, %esp
pushl $0
popf
cli
push %ebx
push %eax
call _kernel_main
2:
hlt
jmp 2b
.align 8
_put_char: # void print (char str);
push %es
push %eax
push %esi
mov $0x18, %eax
mov %eax, %es
mov (_scr_loc), %esi
mov 0x10(%esp), %al
mov $0xc, %ah
movw %ax, %es: (%esi)
inc %esi
inc %esi
cmp $2000, %esi
jne next0
xor %esi, %esi
next0:
mov %esi, (_scr_loc)
pop %esi
pop %eax
pop %es
ret
idtr:
.word 0
.int 0
gdtr:
.word 4 * 8 - 1
.int gdt_start
.align 8
gdt_start:
.quad 0x0000000000000000
.quad 0x00c09a100000ffff
.quad 0x00c092000000ffff
.quad 0x00c0920b80000002
gdt_end:
.align 8
_position: .int 0;
_scr_loc: .int 0;
.comm stack, 0x100
.align (4 << 10)
stack_start:
kernel.c
#include "multiboot2.h"
#define COLUMNS 80
#define LINES 24
#define ATTRIBUTE 7
#define VIDEO 0xB8000
static int xpos;
static int ypos;
static volatile unsigned char *video;
int kernel_main (unsigned int magic, unsigned int addr) ;
static void cls (void);
static void itoa (char *buf, int base, int d);
static void putchar (int c);
void printf (const char *format, ...);
int scr_loc = 0;
char string[10];
extern void put_char(char str);
int kernel_main (unsigned int magic, unsigned int addr) {
struct multiboot_tag *tag;
unsigned size;
/* Clear the screen. */
cls ();
/* Am I booted by a Multiboot-compliant boot loader? */
if (magic != MULTIBOOT2_BOOTLOADER_MAGIC)
{
printf ("Invalid magic number: 0x%x\n", (unsigned) magic);
}
if (addr & 7)
{
printf ("Unaligned mbi: 0x%x\n", addr);
}
size = *(unsigned *) addr;
printf ("Announced mbi size 0x%x\n", size);
for (tag = (struct multiboot_tag *) (addr + 8);
tag->type != MULTIBOOT_TAG_TYPE_END;
tag = (struct multiboot_tag *) ((multiboot_uint8_t *) tag
+ ((tag->size + 7) & ~7)))
{
printf ("Tag 0x%x, Size 0x%x\n", tag->type, tag->size);
switch (tag->type)
{
case MULTIBOOT_TAG_TYPE_CMDLINE:
printf ("Command line = %s\n",
((struct multiboot_tag_string *) tag)->string);
break;
case MULTIBOOT_TAG_TYPE_BOOT_LOADER_NAME:
printf ("Boot loader name = %s\n",
((struct multiboot_tag_string *) tag)->string);
break;
case MULTIBOOT_TAG_TYPE_MODULE:
printf ("Module at 0x%x-0x%x. Command line %s\n",
((struct multiboot_tag_module *) tag)->mod_start,
((struct multiboot_tag_module *) tag)->mod_end,
((struct multiboot_tag_module *) tag)->cmdline);
break;
case MULTIBOOT_TAG_TYPE_BASIC_MEMINFO:
printf ("mem_lower = %uKB, mem_upper = %uKB\n",
((struct multiboot_tag_basic_meminfo *) tag)->mem_lower,
((struct multiboot_tag_basic_meminfo *) tag)->mem_upper);
break;
case MULTIBOOT_TAG_TYPE_BOOTDEV:
printf ("Boot device 0x%x,%u,%u\n",
((struct multiboot_tag_bootdev *) tag)->biosdev,
((struct multiboot_tag_bootdev *) tag)->slice,
((struct multiboot_tag_bootdev *) tag)->part);
break;
case MULTIBOOT_TAG_TYPE_MMAP:
{
multiboot_memory_map_t *mmap;
printf ("mmap\n");
for (mmap = ((struct multiboot_tag_mmap *) tag)->entries;
(multiboot_uint8_t *) mmap
< (multiboot_uint8_t *) tag + tag->size;
mmap = (multiboot_memory_map_t *)
((unsigned long) mmap
+ ((struct multiboot_tag_mmap *) tag)->entry_size))
printf (" base_addr = 0x%x%x,"
" length = 0x%x%x, type = 0x%x\n",
(unsigned) (mmap->addr >> 32),
(unsigned) (mmap->addr & 0xffffffff),
(unsigned) (mmap->len >> 32),
(unsigned) (mmap->len & 0xffffffff),
(unsigned) mmap->type);
}
break;
case MULTIBOOT_TAG_TYPE_FRAMEBUFFER:
{
multiboot_uint32_t color;
unsigned i;
struct multiboot_tag_framebuffer *tagfb
= (struct multiboot_tag_framebuffer *) tag;
void *fb = (void *) (unsigned long) tagfb->common.framebuffer_addr;
switch (tagfb->common.framebuffer_type)
{
case MULTIBOOT_FRAMEBUFFER_TYPE_INDEXED:
{
unsigned best_distance, distance;
struct multiboot_color *palette;
palette = tagfb->framebuffer_palette;
color = 0;
best_distance = 4*256*256;
for (i = 0; i < tagfb->framebuffer_palette_num_colors; i++)
{
distance = (0xff - palette[i].blue)
* (0xff - palette[i].blue)
+ palette[i].red * palette[i].red
+ palette[i].green * palette[i].green;
if (distance < best_distance)
{
color = i;
best_distance = distance;
}
}
}
break;
case MULTIBOOT_FRAMEBUFFER_TYPE_RGB:
color = ((1 << tagfb->framebuffer_blue_mask_size) - 1)
<< tagfb->framebuffer_blue_field_position;
break;
case MULTIBOOT_FRAMEBUFFER_TYPE_EGA_TEXT:
color = '\\' | 0x0100;
break;
default:
color = 0xffffffff;
break;
}
for (i = 0; i < tagfb->common.framebuffer_width
&& i < tagfb->common.framebuffer_height; i++)
{
switch (tagfb->common.framebuffer_bpp)
{
case 8:
{
multiboot_uint8_t *pixel = fb
+ tagfb->common.framebuffer_pitch * i + i;
*pixel = color;
}
break;
case 15:
case 16:
{
multiboot_uint16_t *pixel
= fb + tagfb->common.framebuffer_pitch * i + 2 * i;
*pixel = color;
}
break;
case 24:
{
multiboot_uint32_t *pixel
= fb + tagfb->common.framebuffer_pitch * i + 3 * i;
*pixel = (color & 0xffffff) | (*pixel & 0xff000000);
}
break;
case 32:
{
multiboot_uint32_t *pixel
= fb + tagfb->common.framebuffer_pitch * i;
for (int j= 0; j < 800; j++)
*(pixel + j) = color;
}
break;
}
}
break;
}
}
}
tag = (struct multiboot_tag *) ((multiboot_uint8_t *) tag
+ ((tag->size + 7) & ~7));
printf ("Total mbi size 0x%x\n", (unsigned) tag - addr);
int aaa = 5678;
printf("My name is Zhi Qiang Li, %d", aaa);
return 1;
}
static void
cls (void)
{
int i;
video = (unsigned char *) VIDEO;
for (i = 0; i < COLUMNS * LINES * 2; i++)
*(video + i) = 0;
xpos = 0;
ypos = 0;
}
/* Convert the integer D to a string and save the string in BUF. If
BASE is equal to 'd', interpret that D is decimal, and if BASE is
equal to 'x', interpret that D is hexadecimal. */
static void
itoa (char *buf, int base, int d)
{
char *p = buf;
char *p1, *p2;
unsigned long ud = d;
int divisor = 10;
/* If %d is specified and D is minus, put `-' in the head. */
if (base == 'd' && d < 0)
{
*p++ = '-';
buf++;
ud = -d;
}
else if (base == 'x')
divisor = 16;
/* Divide UD by DIVISOR until UD == 0. */
do
{
int remainder = ud % divisor;
*p++ = (remainder < 10) ? remainder + '0' : remainder + 'a' - 10;
}
while (ud /= divisor);
/* Terminate BUF. */
*p = 0;
/* Reverse BUF. */
p1 = buf;
p2 = p - 1;
while (p1 < p2)
{
char tmp = *p1;
*p1 = *p2;
*p2 = tmp;
p1++;
p2--;
}
}
/* Put the character C on the screen. */
static void
putchar (int c)
{
if (c == '\n' || c == '\r')
{
newline:
xpos = 0;
ypos++;
if (ypos >= LINES)
ypos = 0;
return;
}
*(video + (xpos + ypos * COLUMNS) * 2) = c & 0xFF;
*(video + (xpos + ypos * COLUMNS) * 2 + 1) = ATTRIBUTE;
xpos++;
if (xpos >= COLUMNS)
goto newline;
}
/* Format a string and print it on the screen, just like the libc
function printf. */
void
printf (const char *format, ...)
{
char **arg = (char **) &format;
int c;
char buf[20];
arg++;
while ((c = *format++) != 0)
{
if (c != '%')
putchar (c);
else
{
char *p, *p2;
int pad0 = 0, pad = 0;
c = *format++;
if (c == '0')
{
pad0 = 1;
c = *format++;
}
if (c >= '0' && c <= '9')
{
pad = c - '0';
c = *format++;
}
switch (c)
{
case 'd':
case 'u':
case 'x':
itoa (buf, c, *((int *) arg++));
p = buf;
goto string;
break;
case 's':
p = *arg++;
if (! p)
p = "(null)";
string:
for (p2 = p; *p2; p2++);
for (; p2 < p + pad; p2++)
putchar (pad0 ? '0' : ' ');
while (*p)
putchar (*p++);
break;
default:
putchar (*((int *) arg++));
break;
}
}
}
}