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Regard whitespace Rev 3519 → Rev 3520

/kernel/trunk/detect/biosdisk.inc
7,6 → 7,7
 
; Detect all BIOS hard drives.
; diamond, 2008
; Do not include USB mass storages. CleverMouse, 2013
 
xor cx, cx
mov es, cx
24,21 → 25,40
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], 1Eh
mov word [si], 4Ah
mov ah, 48h
int 13h
pop ds
jc bddc2
inc byte [es:0x907F]
cmp word [es:si], 1Eh
jb bddl
jb .noide
cmp word [es:si+1Ah], 0xFFFF
jz bddl
jz .noide
inc byte [es:0x907F]
mov al, dl
stosb
push ds
61,7 → 81,15
stosw
pop ds
jmp bddc2
bddl:
.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:0x907F]
mov al, dl
stosb
xor ax, ax