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Rev 2465 Rev 3555
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; Detect all BIOS hard drives.
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; Detect all BIOS hard drives.
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; diamond, 2008
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; diamond, 2008
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; Do not include USB mass storages. CleverMouse, 2013
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        xor     cx, cx
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        xor     cx, cx
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        mov     es, cx
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        mov     es, cx
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        pop     di dx cx
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        pop     di dx cx
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        jc      bddc
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        jc      bddc
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        test    ah, ah
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        test    ah, ah
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        jz      bddc
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        jz      bddc
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        inc     cx
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        inc     cx
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; 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.
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        mov     ah, 48h
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        mov     ah, 48h
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        push    ds
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        push    ds
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        push    es
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        push    es
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        pop     ds
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        pop     ds
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        mov     si, 0xA000
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        mov     si, 0xA000
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        mov     word [si], 1Eh
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        mov     word [si], 4Ah
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        mov     ah, 48h
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        mov     ah, 48h
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        int     13h
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        int     13h
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        pop     ds
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        pop     ds
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        jc      bddc2
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        jc      bddc2
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        inc     byte [es:0x907F]
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        cmp     word [es:si], 1Eh
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        cmp     word [es:si], 1Eh
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        jb      bddl
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        jb      .noide
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        cmp     word [es:si+1Ah], 0xFFFF
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        cmp     word [es:si+1Ah], 0xFFFF
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        jz      bddl
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        jz      .noide
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        inc     byte [es:0x907F]
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        mov     al, dl
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        mov     al, dl
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        stosb
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        stosb
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        push    ds
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        push    ds
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        lds     si, [es:si+1Ah]
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        lds     si, [es:si+1Ah]
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        mov     al, [si+6]
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        mov     al, [si+6]
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;        mov     ax, -1
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;        mov     ax, -1
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@@:
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@@:
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        stosw
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        stosw
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        pop     ds
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        pop     ds
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        jmp     bddc2
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        jmp     bddc2
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bddl:
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.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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        mov     al, dl
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        stosb
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        stosb
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        xor     ax, ax
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        xor     ax, ax
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        stosb
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        stosb
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        dec     ax
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        dec     ax