1+ #include <stddef.h>
2+ #include <stdint.h>
3+
4+ #if defined(__linux__ )
5+ #error "This code must be compiled with a cross-compiler"
6+ #elif !defined(__i386__ )
7+ #error "This code must be compiled with an x86-elf compiler"
8+ #endif
9+
10+ volatile uint16_t * vga_buffer = (uint16_t * )0xB8000 ;
11+ const int VGA_COLS = 80 ;
12+ const int VGA_ROWS = 24 ;
13+
14+ int term_col = 0 ;
15+ int term_row = 0 ;
16+ uint8_t term_color = 0x1F ;
17+
18+ void term_init () {
19+ for (int col = 0 ; col < VGA_COLS ; col ++ ) {
20+ for (int row = 0 ; row < VGA_ROWS ; row ++ ) {
21+ const size_t index = (VGA_COLS * row ) + col ;
22+ vga_buffer [index ] = ((uint16_t )term_color << 8 ) | ' ' ;
23+ }
24+ }
25+ }
26+
27+ void term_putc (char c ) {
28+ switch (c ) {
29+ case '\n' :
30+ {
31+ term_col = 0 ;
32+ term_row ++ ;
33+ break ;
34+ }
35+
36+ default :
37+ {
38+ const size_t index = (VGA_COLS * term_row ) + term_col ;
39+ vga_buffer [index ] = ((uint16_t )term_color << 8 ) | c ;
40+ term_col ++ ;
41+ break ;
42+ }
43+ }
44+
45+ if (term_col >= VGA_COLS ) {
46+ term_col = 0 ;
47+ term_row ++ ;
48+ }
49+
50+ if (term_row >= VGA_ROWS ) {
51+ term_col = 0 ;
52+ term_row = 0 ;
53+ }
54+ }
55+
56+ void term_setpos (int col , int row ) {
57+ term_col = col ;
58+ term_row = row ;
59+ }
60+
61+ void term_setbg (uint8_t color ) {
62+ term_color = color ;
63+ }
64+
65+ void term_print (const char * str ) {
66+ for (size_t i = 0 ; str [i ] != '\0' ; i ++ ) {
67+ term_putc (str [i ]);
68+ }
69+ }
70+
71+ void kernel_main () {
72+ term_init ();
73+ term_print ("\n" );
74+ term_print (" BluDood Inc. BluShell Kernel 1.0 Setup\n" );
75+ term_print (" ============================" );
76+ term_setbg (0xF0 );
77+ for (int i = 0 ; i <= 80 ; i ++ ) {
78+ term_setpos (i , VGA_ROWS );
79+ if (i == 60 ) {
80+ term_print ("|" );
81+ } else {
82+ term_print (" " );
83+ }
84+ }
85+ const char * bottom = "stay sussy" ;
86+ for (size_t i = 0 ; bottom [i ] != '\0' ; i ++ ) {
87+ term_setpos (i , VGA_ROWS );
88+ term_putc (bottom [i ]);
89+ }
90+ term_setbg (0x1F );
91+ term_setpos (3 , 4 );
92+ term_print ("Welcome to Setup." );
93+ term_setpos (3 , 6 );
94+ term_print ("The Setup program prepared BluDood Inc. BluShell 1.0 to" );
95+ term_setpos (3 , 7 );
96+ term_print ("run on your computer." );
97+ term_setpos (5 , 9 );
98+ term_print (" * To set up BluShell now, press Enter." );
99+ term_setpos (5 , 11 );
100+ term_print (" * To learn more about Setup before continuingm press F1." );
101+ term_setpos (5 , 13 );
102+ term_print (" * To quit Setup without installing BluShell, press F3." );
103+ term_setpos (3 , 15 );
104+ term_print ("Note: BluShell is not functional. Nothing works :troll:" );
105+ term_setpos (3 , 17 );
106+ term_print ("Socials:" );
107+ term_setpos (5 , 19 );
108+ term_print (
"Email: [email protected] " );
109+ term_setpos (5 , 21 );
110+ term_print ("Twitter: @ItsBluDood" );
111+ }
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