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FS.asm
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;;*************************************************************************************************
;;
;; 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.Filesystem:
.code: db 0
.partitionSize: dd 0
.FAT12 = 01h ;; FAT12 (Future)
.FAT16 = 04h ;; FAT16 (< 32 MB)
.FAT16B = 06h ;; FAT16B (FAT16B) - Suported
.FAT16LBA = 0Eh ;; FAT16 (LBA)
;;************************************************************************************
HBoot.FS.setFilesystem:
call HBoot.FS.readMBR
mov byte[HBoot.Filesystem.code], ah
ret
;;************************************************************************************
HBoot.FS.readMBR:
;; First we must load the MBR into memory
mov ax, 01h ;; Number of sectors to read
mov esi, 00h ;; First Sector LBA
mov di, diskBuffer ;; Offset
mov dl, byte[idDrive]
call HBoot.Disk.loadSector
jc .error
mov ebx, diskBuffer
add ebx, 0x1BE ;; First partition offset
mov ah, byte[es:ebx+04h] ;; Contains the file system
mov ebx, dword[es:ebx+0xF] ;; Partition size
mov dword[HBoot.Filesystem.partitionSize], ebx
jmp .end
.error:
mov si, HBoot.Messages.errorMBR
call HBoot.Console.printString
jmp $
.end:
ret
;;************************************************************************************
;; Here we have the generic functions called, which will redirect to the correct logic
HBoot.FS.searchFile:
mov ah, byte[HBoot.Filesystem.code]
cmp ah, HBoot.Filesystem.FAT16B
je .FAT16B
mov si, HBoot.Messages.invalidFilesystem
call HBoot.Console.printString
jmp $
.FAT16B:
call HBoot.FS.FAT16B.searchFileFAT16B
ret
;;************************************************************************************
;; List of Filesystems supported by HBoot
include "FAT16B/fat16B.asm"