139 lines
6.0 KiB
NASM
139 lines
6.0 KiB
NASM
;=----------------------------------------------------------------------------=;
|
|
; GNU GPL OS/K ;
|
|
; ;
|
|
; Authors: spectral` ;
|
|
; NeoX ;
|
|
; ;
|
|
; Desc: Basic Read Only ATA Long mode Driver ;
|
|
; (x86_64 architecture only) ;
|
|
;=----------------------------------------------------------------------------=;
|
|
|
|
[BITS 64]
|
|
|
|
;; BPB
|
|
%define OEMName bp+0x03 ; Disk label
|
|
%define bytesPerSector bp+0x0b ; Bytes per sector
|
|
%define sectorsPerCluster bp+0x0d ; Sectors per cluster
|
|
%define reservedSectors bp+0x0e ; Reserved sectors
|
|
%define fats bp+0x10 ; Number of fats
|
|
%define rootDirEntries bp+0x11 ; Number of entries in root dir
|
|
%define sectors bp+0x13 ; Logical sectors
|
|
%define mediaType bp+0x15 ; Media descriptor byte
|
|
%define fatSectors bp+0x16 ; Sectors per FAT
|
|
%define sectorsPerTrack bp+0x18 ; Sectors per track
|
|
%define heads bp+0x1a ; Number of sides/heads
|
|
%define hiddenSectors bp+0x1c ; Hidden sectors
|
|
%define hugeSectors bp+0x20 ; LBA sectors
|
|
%define biosBootdrvNum bp+0x24 ; Bootdrv number
|
|
%define reserved bp+0x25 ; This is not used
|
|
%define bootSignature bp+0x26 ; Bootdrv signature
|
|
%define volumeId bp+0x27 ; Volume ID
|
|
%define volumeLabel bp+0x2b ; Volume Label
|
|
%define fatTypeLabel bp+0x36 ; File system type
|
|
|
|
;; GLOBAL DATA
|
|
|
|
Bootdrv db 0
|
|
end db "[End of Sector]", 0x0
|
|
buffer: times 513 db "_"
|
|
|
|
;; TEXT
|
|
|
|
ata_read:
|
|
;-----------------------------------------------------------------------;
|
|
; x64/LM ATA Reading function ;
|
|
; ;
|
|
; ;
|
|
;-----------------------------------------------------------------------;
|
|
|
|
; Technical infos about the ports (Intel Doc):
|
|
;
|
|
; Port Access Mode Misc
|
|
;
|
|
; 1f0 r/w Data register, the bytes of the disk itself
|
|
; 1f1 r Error register that can be handled
|
|
; 1f2 r/w Sector count, how many sectors to read
|
|
; 1f3 r/w Sector number, the actual sector wanted
|
|
; 1f4 r/w Cylinder low, cylinders is 0-1024
|
|
; 1f5 r/w Cylinder high, this makes up the rest of the 1024
|
|
; 1f6 r/w Drive/head
|
|
; bit 7 = 1
|
|
; bit 6 = 0
|
|
; bit 5 = 1
|
|
; bit 4 = 0 drive 0 select
|
|
; = 1 drive 1 select
|
|
; bit 3-0 head select bits
|
|
; 1f7 r Status register
|
|
; bit 7 = 1 controller is executing a command
|
|
; bit 6 = 1 drive is ready
|
|
; bit 5 = 1 write fault
|
|
; bit 4 = 1 seek complete
|
|
; bit 3 = 1 sector buffer requires servicing
|
|
; bit 2 = 1 disk data read corrected
|
|
; bit 1 = 1 index - set to 1 each revolution
|
|
; bit 0 = 1 previous command ended in an error
|
|
; 1f7 w Command register
|
|
; commands:
|
|
; 50h format track
|
|
; 20h read sectors with retry
|
|
; 21h read sectors without retry
|
|
; 22h read long with retry
|
|
; 23h read long without retry
|
|
; 30h write sectors with retry
|
|
; 31h write sectors without retry
|
|
; 32h write long with retry
|
|
; 33h write long without retry
|
|
;
|
|
|
|
push rax
|
|
push rbx
|
|
push rdx
|
|
push rcx
|
|
push rdi
|
|
mov dx, 0x1f6 ; Drive and head port
|
|
mov al, 0x0a0 ; Drive 0, head 0
|
|
out dx,al
|
|
|
|
mov dx, 0x1f2 ; Sector count port
|
|
mov al, 1 ; Read one sector
|
|
out dx, al
|
|
|
|
mov dx, 0x1f3 ; Sector number port
|
|
mov al, 1 ; Read sector one
|
|
out dx, al
|
|
|
|
mov dx, 0x1f4 ; Cylinder low port
|
|
mov al, 0 ; Cylinder 0
|
|
out dx, al
|
|
|
|
mov dx, 0x1f5 ; Cylinder high port
|
|
mov al, 0 ; The rest of the cylinder 0
|
|
out dx, al
|
|
|
|
mov dx, 0x1f7 ; Command port
|
|
mov al, 0x20 ; Read with retry.
|
|
out dx, al
|
|
still_going:
|
|
in al, dx
|
|
test al, 8 ; This means the sector buffer requires
|
|
;servicing.
|
|
jz still_going ; Don't continue until the sector buffer
|
|
;is ready.
|
|
|
|
mov cx, 512/2 ; One sector /2 because it copies words
|
|
mov rdi, buffer
|
|
mov dx, 0x1f0 ; Data port - data comes in and out of here.
|
|
rep insw
|
|
pop rdi
|
|
pop rcx
|
|
pop rdx
|
|
pop rbx
|
|
pop rax
|
|
mov bl, 0x0F
|
|
mov esi, buffer
|
|
call dump
|
|
mov bl, 0x0A
|
|
mov esi, end
|
|
call write
|
|
ret
|