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  1. ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  2. ;;                                                              ;;
  3. ;; Copyright (C) KolibriOS team 2008-2014. All rights reserved. ;;
  4. ;; Distributed under terms of the GNU General Public License    ;;
  5. ;;                                                              ;;
  6. ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  7.  
  8. $Revision: 4850 $
  9.  
  10.  
  11. ; Detect all BIOS hard drives.
  12. ; diamond, 2008
  13. ; Do not include USB mass storages. CleverMouse, 2013
  14.  
  15.         xor     cx, cx
  16.         mov     es, cx
  17.         mov     di, 0x9080
  18.         mov     byte [es:di-1], cl
  19.         cmp     [preboot_biosdisk], 1
  20.         jnz     bdde
  21.         mov     dl, 80h
  22. bdds:
  23.         mov     ah, 15h
  24.         push    cx dx di
  25.         int     13h
  26.         pop     di dx cx
  27.         jc      bddc
  28.         test    ah, ah
  29.         jz      bddc
  30.         inc     cx
  31. ; We are going to call int 13h/func 48h, Extended get drive parameters.
  32. ; The latest version of the EDD specification is 3.0.
  33. ; There are two slightly incompatible variants for version 3.0;
  34. ; original one from Phoenix in 1998, see e.g.
  35. ; http://www.t10.org/t13/technical/d98120r0.pdf, and T13 draft,
  36. ; http://www.t13.org/documents/UploadedDocuments/docs2004/d1572r3-EDD3.pdf
  37. ; T13 draft addresses more possible buses, so it gives additional 8 bytes
  38. ; for device path.
  39. ; Most BIOSes follow Phoenix, but T13 version is also known to be used
  40. ; (e.g. systems based on AMD Geode).
  41. ; Fortunately, there is an in/out length field, so
  42. ; it is easy to tell what variant was selected by the BIOS:
  43. ; Phoenix-3.0 has 42h bytes, T13-3.0 has 4Ah bytes.
  44. ; Note that 2.0 has 1Eh bytes, 1.1 has 1Ah bytes; both variants of 3.0 have
  45. ; the same structure for first 1Eh bytes, compatible with previous versions.
  46. ; Note also that difference between Phoenix-3.0 and T13-3.0 starts near the
  47. ; end of the structure, so the current code doesn't even need to distinguish.
  48. ; It needs, however, give at least 4Ah bytes as input and expect that BIOS
  49. ; could return 42h bytes as output while still giving all the information.
  50.         mov     ah, 48h
  51.         push    ds
  52.         push    es
  53.         pop     ds
  54.         mov     si, 0xA000
  55.         mov     word [si], 4Ah
  56.         mov     ah, 48h
  57.         int     13h
  58.         pop     ds
  59.         jc      bddc2
  60.         cmp     word [es:si], 1Eh
  61.         jb      .noide
  62.         cmp     word [es:si+1Ah], 0xFFFF
  63.         jz      .noide
  64.         inc     byte [es:0x907F]
  65.         mov     al, dl
  66.         stosb
  67.         push    ds
  68.         lds     si, [es:si+1Ah]
  69.         mov     al, [si+6]
  70.         and     al, 0xF
  71.         stosb
  72.         mov     al, byte [si+4]
  73.         shr     al, 4
  74.         and     ax, 1
  75.         cmp     word [si], 1F0h
  76.         jz      @f
  77.         inc     ax
  78.         inc     ax
  79.         cmp     word [si], 170h
  80.         jz      @f
  81.         or      ax, -1
  82. ;        mov     ax, -1
  83. @@:
  84.         stosw
  85.         pop     ds
  86.         jmp     bddc2
  87. .noide:
  88.         cmp     word [es:si], 42h
  89.         jb      .nousb
  90.         cmp     word [es:si+28h], 'US'
  91.         jnz     .nousb
  92.         cmp     byte [es:si+2Ah], 'B'
  93.         jz      bddc2
  94. .nousb:
  95.         inc     byte [es:0x907F]
  96.         mov     al, dl
  97.         stosb
  98.         xor     ax, ax
  99.         stosb
  100.         dec     ax
  101.         stosw
  102. ;        mov     al, 0
  103. ;        stosb
  104. ;        mov     ax, -1
  105. ;        stosw
  106. bddc2:
  107.         cmp     cl, [es:0x475]
  108.         jae     bdde
  109. bddc:
  110.         inc     dl
  111.         jnz     bdds
  112. bdde:
  113.