2014-01-08 05:03:52 +01:00
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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2014-05-12 21:41:55 +02:00
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;; Copyright (C) KolibriOS team 2008-2014. All rights reserved. ;;
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2014-01-08 05:03:52 +01:00
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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2014-05-12 21:41:55 +02:00
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$Revision: 4850 $
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2014-01-08 05:03:52 +01:00
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; Detect all BIOS hard drives.
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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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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
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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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push ds
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push es
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pop ds
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mov si, 0xA000
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mov word [si], 4Ah
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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]
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mov al, dl
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stosb
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push ds
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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
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pop ds
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jmp bddc2
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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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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
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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:
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