├── LICENSE
├── README.md
├── bin
    └── boot.o
└── minimalboot.asm


/LICENSE:
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 1 | MIT License
 2 | 
 3 | Copyright (c) 2021 Ch4r0nN λ
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


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/README.md:
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 1 | # MinimalBoot
 2 | A small example of an assembly bootloader
 3 | 
 4 | ## Requirements
 5 | 
 6 | • Have the BIOS customized
 7 | 
 8 | ### Features
 9 | 
10 | • A simple and clean code bootloader
11 | 
12 | • Change color randomly thus leaving a modern look
13 | 


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/bin/boot.o:
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https://raw.githubusercontent.com/thebigcicca/MinimalBoot/1d933dea22a570129f85602682c2eff33c428f6c/bin/boot.o


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/minimalboot.asm:
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 1 |  [ORG 0x7C00]
 2 |     mov ah, 0x02
 3 |     mov al, 0x01
 4 |     mov ch, 0x00
 5 |     mov cl, 0x02
 6 |     mov dh, 0x01
 7 |     mov es, [EXTENSION]
 8 |     mov bx, 0x00
 9 |     int 13h
10 |     jmp PRINT
11 | 	 
12 | MSG: db  'Welcome to my OS',0xa,13,10,0x00
13 | 
14 | times 510-($-$$) db 0
15 | db 0x55
16 | db 0xAA
17 | 
18 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
19 | EXTENSION:
20 | mov ah, 0x00; Contains the type of function
21 | 	mov al, 0x13
22 | 	int 0x10
23 | ;     PARAMETERS
24 |     mov al, 0x01 ; The pixel color
25 | 	mov bh, 0x00 ; The page number 
26 | 	mov cx, 0x00 ; X Position
27 | 	mov dx, 0x00 ; Y Position
28 | 
29 | 	
30 | LOOP:
31 |     mov ah, 0x0C
32 | 	int 0x10 ; Video function
33 | 	je RESETCOLLOR
34 | 	inc cx ; Advance to the right pixel
35 | 	cmp cx, 0x0140 ; Checks if it is 320
36 | 	jne LOOP ;  Continued if not 320
37 | 	mov cx, 0x00 ; Returns to position 0 of the X axis
38 | 	inc dx ;  Advance to the next line
39 | 	cmp dx, 0xC8 ; Checks if it reached the last line 
40 | 	jne LOOP 
41 | 	mov dx, 0x00  ; Back to the first line
42 | 	inc al ; Jump to the next color 
43 | 	cmp al, 0xFF ; Check if it is the last color
44 | 	je RESETCOLLOR
45 | 	jmp LOOP
46 | RESETCOLLOR:
47 |     mov al, 0x00 ; Collor reset
48 |     jmp LOOP
49 | PRINT:
50 |     xor ax, ax    ; Reset acumulator
51 | 	mov ds, ax
52 | 	mov si, MSG
53 | CHAR_PRINT: lodsb
54 |     or al, al ; Checks if the value is 0
55 | 	jz WAITNG  ; Loop until you turn off the computer
56 | 	mov ah, 0x0E 
57 | 	int 0x10
58 | 	jmp CHAR_PRINT ; Jump to the next character
59 | WAITNG:
60 |     jmp WAITNG
61 | 


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