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2288 clevermous 1 
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;                                                              ;;
5363 yogev_ezra 3 
;; Copyright (C) KolibriOS team 2008-2015. All rights reserved. ;;
2288 clevermous 4 
;; Distributed under terms of the GNU General Public License    ;;
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;;                                                              ;;
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4850 mario79 8 
$Revision: 6843 $
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2288 clevermous 11 
; Detect all BIOS hard drives.
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; diamond, 2008
3520 clevermous 13 
; Do not include USB mass storages. CleverMouse, 2013
6843 dunkaist 14 
; Read the number of sectors, bytes per sector. dunkaist, 2017
2288 clevermous 15 
 
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        xor     cx, cx
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        mov     es, cx
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        mov     di, 0x9080
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        mov     byte [es:di-1], cl
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        cmp     [preboot_biosdisk], 1
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        jnz     bdde
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        mov     dl, 80h
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bdds:
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        mov     ah, 15h
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        push    cx dx di
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        int     13h
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        pop     di dx cx
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        jc      bddc
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        test    ah, ah
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        jz      bddc
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        inc     cx
3520 clevermous 32 
; We are going to call int 13h/func 48h, Extended get drive parameters.
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; The latest version of the EDD specification is 3.0.
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; There are two slightly incompatible variants for version 3.0;
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; original one from Phoenix in 1998, see e.g.
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; http://www.t10.org/t13/technical/d98120r0.pdf, and T13 draft,
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; http://www.t13.org/documents/UploadedDocuments/docs2004/d1572r3-EDD3.pdf
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; T13 draft addresses more possible buses, so it gives additional 8 bytes
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; for device path.
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; Most BIOSes follow Phoenix, but T13 version is also known to be used
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; (e.g. systems based on AMD Geode).
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; Fortunately, there is an in/out length field, so
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; it is easy to tell what variant was selected by the BIOS:
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; Phoenix-3.0 has 42h bytes, T13-3.0 has 4Ah bytes.
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; Note that 2.0 has 1Eh bytes, 1.1 has 1Ah bytes; both variants of 3.0 have
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; the same structure for first 1Eh bytes, compatible with previous versions.
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; Note also that difference between Phoenix-3.0 and T13-3.0 starts near the
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; end of the structure, so the current code doesn't even need to distinguish.
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; It needs, however, give at least 4Ah bytes as input and expect that BIOS
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; could return 42h bytes as output while still giving all the information.
2288 clevermous 51 
        mov     ah, 48h
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        push    ds
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        push    es
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        pop     ds
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        mov     si, 0xA000
3520 clevermous 56 
        mov     word [si], 4Ah
2288 clevermous 57 
        mov     ah, 48h
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        int     13h
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        pop     ds
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        jc      bddc2
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        cmp     word [es:si], 1Eh
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        jb      .noide
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        cmp     word [es:si+1Ah], 0xFFFF
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        jz      .noide
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        inc     byte [es:0x907F]
2288 clevermous 66 
        mov     al, dl
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        stosb
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        push    ds
6843 dunkaist 69 
        push    si
2288 clevermous 70 
        lds     si, [es:si+1Ah]
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        mov     al, [si+6]
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        and     al, 0xF
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        stosb
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        mov     al, byte [si+4]
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        shr     al, 4
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        and     ax, 1
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        cmp     word [si], 1F0h
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        jz      @f
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        inc     ax
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        inc     ax
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        cmp     word [si], 170h
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        jz      @f
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        or      ax, -1
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;        mov     ax, -1
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@@:
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        stosw
6843 dunkaist 87 
        pop     si
2288 clevermous 88 
        pop     ds
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        jmp     bddc3
3520 clevermous 90 
.noide:
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        cmp     word [es:si], 42h
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        jb      .nousb
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        cmp     word [es:si+28h], 'US'
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        jnz     .nousb
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        cmp     byte [es:si+2Ah], 'B'
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        jz      bddc2
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.nousb:
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        inc     byte [es:0x907F]
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        mov     al, dl
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        stosb
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        xor     ax, ax
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        stosb
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        dec     ax
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        stosw
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;        mov     al, 0
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;        stosb
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;        mov     ax, -1
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;        stosw
6843 dunkaist 109 
bddc3:
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        movzx   eax, word[es:si+24]
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        stosd
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        mov     eax, [es:si+16]
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        stosd
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        mov     eax, [es:si+20]
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        stosd
2288 clevermous 116 
bddc2:
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        cmp     cl, [es:0x475]
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        jae     bdde
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bddc:
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        inc     dl
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        jnz     bdds
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bdde: