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139 lines
6.9 KiB
NASM
139 lines
6.9 KiB
NASM
;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Desc: Basic Read Only ATA Long mode Driver ;
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; (x86_64 architecture only) ;
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; ;
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; ;
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; Copyright © 2018-2020 The OS/K Team ;
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; ;
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; This file is part of OS/K. ;
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; ;
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; OS/K is free software: you can redistribute it and/or modify ;
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; it under the terms of the GNU General Public License as published by ;
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; the Free Software Foundation, either version 3 of the License, or ;
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; (at your option) any later version. ;
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; ;
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; OS/K is distributed in the hope that it will be useful, ;
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; but WITHOUT ANY WARRANTY; without even the implied warranty of ;
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;
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; GNU General Public License for more details. ;
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; ;
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; You should have received a copy of the GNU General Public License ;
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; along with OS/K. If not, see <https://www.gnu.org/licenses/>. ;
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;=----------------------------------------------------------------------------=;
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global IoReadATA
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extern KernLog
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[BITS 64]
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;; BPB
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%define OEMName bp+0x03 ; Disk label
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%define bytesPerSector bp+0x0b ; Bytes per sector
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%define sectorsPerCluster bp+0x0d ; Sectors per cluster
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%define reservedSectors bp+0x0e ; Reserved sectors
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%define fats bp+0x10 ; Number of fats
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%define rootDirEntries bp+0x11 ; Number of entries in root dir
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%define sectors bp+0x13 ; Logical sectors
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%define mediaType bp+0x15 ; Media descriptor byte
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%define fatSectors bp+0x16 ; Sectors per FAT
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%define sectorsPerTrack bp+0x18 ; Sectors per track
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%define heads bp+0x1a ; Number of sides/heads
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%define hiddenSectors bp+0x1c ; Hidden sectors
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%define hugeSectors bp+0x20 ; LBA sectors
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%define biosBootdrvNum bp+0x24 ; Bootdrv number
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%define reserved bp+0x25 ; This is not used
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%define bootSignature bp+0x26 ; Bootdrv signature
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%define volumeId bp+0x27 ; Volume ID
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%define volumeLabel bp+0x2b ; Volume Label
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%define fatTypeLabel bp+0x36 ; File system type
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;; GLOBAL DATA
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Bootdrv db 0
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;; TEXT
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IoReadATA:
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;-----------------------------------------------------------------------;
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; x64/LM ATA Reading function ;
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; rsi : number of sectors to read XXX seems to be buggy ;
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; rdx : the first sector to read ;
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;-----------------------------------------------------------------------;
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; Technical info about the ports (Intel Doc):
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;
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; Port Access Mode Misc
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;
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; 1f0 r/w Data register, the bytes of the disk itself
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; 1f1 r Error register that can be handled
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; 1f2 r/w Sector count, how many sectors to read
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; 1f3 r/w Sector number, the actual sector wanted
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; 1f4 r/w Cylinder low, cylinders is 0-1024
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; 1f5 r/w Cylinder high, this makes up the rest of the 1024
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; 1f6 r/w Drive/head
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; bit 7 = 1
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; bit 6 = 0
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; bit 5 = 1
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; bit 4 = 0 drive 0 select
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; = 1 drive 1 select
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; bit 3-0 head select bits
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; 1f7 r Status register
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; bit 7 = 1 controller is executing a command
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; bit 6 = 1 drive is ready
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; bit 5 = 1 write fault
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; bit 4 = 1 seek complete
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; bit 3 = 1 sector buffer requires servicing
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; bit 2 = 1 disk data read corrected
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; bit 1 = 1 index - set to 1 each revolution
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; bit 0 = 1 previous command ended in an error
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; 1f7 w Command register
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; commands:
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; 50h format track
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; 20h read sectors with retry
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; 21h read sectors without retry
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; 22h read long with retry
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; 23h read long without retry
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; 30h write sectors with retry
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; 31h write sectors without retry
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; 32h write long with retry
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; 33h write long without retry
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;
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push rbx
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mov bh, dl
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mov dx, si
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mov bl, dl
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mov dx, 0x1f6 ; Drive and head port
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mov al, 0x0a0 ; Drive 0, head 0
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out dx,al
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mov dx, 0x1f2 ; Sector count port
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mov al, bl ; Read bl(s) sector
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out dx, al
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mov dx, 0x1f3 ; Sector number port
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mov al, bh ; Read from sector n°bh
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out dx, al
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mov dx, 0x1f4 ; Cylinder low port
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mov al, 0 ; Cylinder 0
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out dx, al
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mov dx, 0x1f5 ; Cylinder high port
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mov al, 0 ; The rest of the cylinder 0
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out dx, al
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mov dx, 0x1f7 ; Command port
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mov al, 0x20 ; Read with retry.
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out dx, al
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still_going:
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in al, dx
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test al, 8 ; This means the sector buffer requires
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;servicing.
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jz still_going ; Don't continue until the sector buffer
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;is ready.
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mov cx, 512/2 ; One sector /2 because it copies words
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mov dx, 0x1f0 ; Data port - data comes in and out of here.
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rep insw
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pop rbx
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ret |