disks.asm

;;*************************************************************************************************
;;
;; 88                                                                                88              
;; 88                                                                                ""              
;; 88                                                                                                
;; 88,dPPPba,   ,adPPPba, 8b,     ,d8 ,adPPPPba,  ,adPPPb,d8  ,adPPPba,  8b,dPPPba,  88 8b,     ,d8  
;; 88P'    "88 a8P     88  `P8, ,8P'  ""     `P8 a8"    `P88 a8"     "8a 88P'   `"88 88  `P8, ,8P'   
;; 88       88 8PP"""""""    )888(    ,adPPPPP88 8b       88 8b       d8 88       88 88    )888(     
;; 88       88 "8b,   ,aa  ,d8" "8b,  88,    ,88 "8a,   ,d88 "8a,   ,a8" 88       88 88  ,d8" "8b,   
;; 88       88  `"Pbbd8"' 8P'     `P8 `"8bbdP"P8  `"PbbdP"P8  `"PbbdP"'  88       88 88 8P'     `P8  
;;                                               aa,    ,88                                         
;;                                                "P8bbdP"       
;;
;;                     Sistema Operacional Hexagonix - Hexagonix Operating System
;;
;;                         Copyright (c) 2015-2025 Felipe Miguel Nery Lunkes
;;                        Todos os direitos reservados - All rights reserved.
;;
;;*************************************************************************************************
;;
;; Português:
;; 
;; O Hexagonix e seus componentes são licenciados sob licença BSD-3-Clause. Leia abaixo
;; a licença que governa este arquivo e verifique a licença de cada repositório para
;; obter mais informações sobre seus direitos e obrigações ao utilizar e reutilizar
;; o código deste ou de outros arquivos.
;;
;; English:
;;
;; Hexagonix and its components are licensed under a BSD-3-Clause license. Read below
;; the license that governs this file and check each repository's license for
;; obtain more information about your rights and obligations when using and reusing
;; the code of this or other files.
;;
;;*************************************************************************************************
;;
;; BSD 3-Clause License
;;
;; Copyright (c) 2015-2025, Felipe Miguel Nery Lunkes
;; All rights reserved.
;; 
;; Redistribution and use in source and binary forms, with or without
;; modification, are permitted provided that the following conditions are met:
;; 
;; 1. Redistributions of source code must retain the above copyright notice, this
;;    list of conditions and the following disclaimer.
;;
;; 2. Redistributions in binary form must reproduce the above copyright notice,
;;    this list of conditions and the following disclaimer in the documentation
;;    and/or other materials provided with the distribution.
;;
;; 3. Neither the name of the copyright holder nor the names of its
;;    contributors may be used to endorse or promote products derived from
;;    this software without specific prior written permission.
;; 
;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
;; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
;; DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
;; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
;; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
;; CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
;; OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
;; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;
;; $HexagonixOS$

HBoot.Disk:

.size:         db 16
.reserved:     db 0
.totalSectors: dw 0
.offset:       dw 0x0000
.segment:      dw 0
.LBA:          dd 0
               dd 0
.dsq0Online:   db 0
.dsq1Online:   db 0
.hd0Online:    db 0
.hd1Online:    db 0

;;************************************************************************************
;;  
;; Disk description
;;
;;************************************************************************************
                                                        
bytesPerSector:     dw 512 ;; Number of bytes in each sector
sectoresPerCluster: db 8   ;; Sectores per cluster
reservedSectors:    dw 16  ;; Reserved sectors after the boot sector
totalFATs:          db 2   ;; Number of FAT tables
rootEntries:        dw 512 ;; Total number of folders and files in the root directory
sectoresPerFAT:     dw 16  ;; Sectors per FAT
idDrive:            db 0   ;; Drive identification number
rootSize:           dw 0   ;; Root directory size (in sectors)
sizeFATs:           dw 0   ;; Size of FAT tables (in sectors)
dataArea:           dd 0   ;; Data area physical address (LBA)
partitionLBAAdress: dd 0   ;; Partition LBA address
BPBAdress:          dd 0   ;; BIOS Parameter Block (BPB) address
cluster:            dw 0   ;; Current cluster

;;************************************************************************************

;; Load sector from specified disk
;;
;; Input:
;;
;; AX    - Total sectors to load
;; ESI   - LBA Address
;; ES:DI - Destination

HBoot.Disk.loadSector:

    push si

    mov word[HBoot.Disk.totalSectors], ax
    mov dword[HBoot.Disk.LBA], esi
    mov word[HBoot.Disk.segment], es
    mov word[HBoot.Disk.offset], di

    mov dl, byte[idDrive]
    mov si, HBoot.Disk
    mov ah, 0x42 ;; Reading function
    
    int 13h ;; BIOS Disk Services
    
    jnc .done          

;; If disk errors occur, display error message on screen

    mov si, HBoot.Messages.diskError   
    
    call HBoot.Console.printString
    
    jmp $

.done:
    
    pop si
    
    ret

;;************************************************************************************

HBoot.Disk.checkDisks:

    pushad
    pushf

.checkDsq0:

    mov ah, 02h
    mov al, 01h
    mov ch, 01h
    mov cl, 01h
    mov bx, diskBuffer
    mov dh, 00h
    mov dl, 00h 
 
    int 13h

    jc .dsq0Error
 
    mov byte[HBoot.Disk.dsq0Online], 01h
 
    jmp .checkDsq1
 
.dsq0Error:
 
    mov byte[HBoot.Disk.dsq0Online], 00h
  
    jmp .checkDsq1
  
.checkDsq1:
  
    mov ah, 02h
    mov al, 01h
    mov ch, 01h
    mov cl, 01h
    mov bx, diskBuffer
    mov dh, 00h
    mov dl, 01h 
 
    int 13h
 
    jc .dsq1Error
 
    mov byte[HBoot.Disk.dsq1Online], 01h
 
    jmp .checkHd0
 
.dsq1Error:
 
    mov byte[HBoot.Disk.dsq1Online], 00h

    jmp .checkHd0

.checkHd0:

    mov ah, 02h
    mov al, 01h
    mov ch, 01h
    mov cl, 01h
    mov bx, diskBuffer
    mov dh, 00h
    mov dl, 80h 
 
    int 13h

    jc .hd0Error
 
    mov byte[HBoot.Disk.hd0Online], 01h
 
    jmp .checkHd1
 
 .hd0Error:
 
    mov byte[HBoot.Disk.hd0Online], 00h
  
    jmp .checkHd1
  
.checkHd1:
  
    mov ah, 02h
    mov al, 01h
    mov ch, 01h
    mov cl, 01h
    mov bx, diskBuffer
    mov dh, 00h
    mov dl, 81h 
 
    int 13h
 
    jc .hd1Error
 
    mov byte[HBoot.Disk.hd1Online], 01h
 
    jmp .continue
 
 .hd1Error:
 
    mov byte[HBoot.Disk.hd1Online], 00h

.continue:

    popf
    popad
    
    ret

;;************************************************************************************

HBoot.Disk.stopDisks:

.hd0:

    mov ah, 00h
    mov dl, 80h

    int 13h

.hd1:

    mov ah, 00h
    mov dl, 81h

    int 13h

.dsq0:

    mov ah, 00h
    mov dl, 00h

    int 13h

.dsq1:

    mov ah, 00h
    mov dl, 01h

    int 13h

.continue:

    ret
    
;;************************************************************************************