kolibrios/kernel/trunk/detect/biosdisk.inc

123 lines
3.7 KiB
PHP
Raw Normal View History

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2008-2015. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision$
; Detect all BIOS hard drives.
; diamond, 2008
; Do not include USB mass storages. CleverMouse, 2013
; Read the number of sectors, bytes per sector. dunkaist, 2017
xor cx, cx
mov es, cx
mov di, BOOT_LO.bios_hd
mov byte [es:di-1], cl
cmp [preboot_biosdisk], 1
jnz bdde
mov dl, 80h
bdds:
mov ah, 15h
push cx dx di
int 13h
pop di dx cx
jc bddc
test ah, ah
jz bddc
inc cx
; We are going to call int 13h/func 48h, Extended get drive parameters.
; The latest version of the EDD specification is 3.0.
; There are two slightly incompatible variants for version 3.0;
; original one from Phoenix in 1998, see e.g.
; http://www.t10.org/t13/technical/d98120r0.pdf, and T13 draft,
; http://www.t13.org/documents/UploadedDocuments/docs2004/d1572r3-EDD3.pdf
; T13 draft addresses more possible buses, so it gives additional 8 bytes
; for device path.
; Most BIOSes follow Phoenix, but T13 version is also known to be used
; (e.g. systems based on AMD Geode).
; Fortunately, there is an in/out length field, so
; it is easy to tell what variant was selected by the BIOS:
; Phoenix-3.0 has 42h bytes, T13-3.0 has 4Ah bytes.
; Note that 2.0 has 1Eh bytes, 1.1 has 1Ah bytes; both variants of 3.0 have
; the same structure for first 1Eh bytes, compatible with previous versions.
; Note also that difference between Phoenix-3.0 and T13-3.0 starts near the
; end of the structure, so the current code doesn't even need to distinguish.
; It needs, however, give at least 4Ah bytes as input and expect that BIOS
; could return 42h bytes as output while still giving all the information.
mov ah, 48h
push ds
push es
pop ds
mov si, 0xA000
mov word [si], 4Ah
mov ah, 48h
int 13h
pop ds
jc bddc2
cmp word [es:si], 1Eh
jb .noide
cmp word [es:si+1Ah], 0xFFFF
jz .noide
inc byte [es:BOOT_LO.bios_hd_cnt]
mov al, dl
stosb
push ds
push si
lds si, [es:si+1Ah]
mov al, [si+6]
and al, 0xF
stosb
mov al, byte [si+4]
shr al, 4
and ax, 1
cmp word [si], 1F0h
jz @f
inc ax
inc ax
cmp word [si], 170h
jz @f
or ax, -1
; mov ax, -1
@@:
stosw
pop si
pop ds
jmp bddc3
.noide:
cmp word [es:si], 42h
jb .nousb
cmp word [es:si+28h], 'US'
jnz .nousb
cmp byte [es:si+2Ah], 'B'
jz bddc2
.nousb:
inc byte [es:BOOT_LO.bios_hd_cnt]
mov al, dl
stosb
xor ax, ax
stosb
dec ax
stosw
; mov al, 0
; stosb
; mov ax, -1
; stosw
bddc3:
movzx eax, word[es:si+24]
stosd
mov eax, [es:si+16]
stosd
mov eax, [es:si+20]
stosd
bddc2:
cmp cl, [es:0x475]
jae bdde
bddc:
inc dl
jnz bdds
bdde: