| 1 | ; Project name : IDE BIOS
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| 2 | ; Description : Functions for printing boot related strings.
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| 3 |
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| 4 | ; Section containing code
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| 5 | SECTION .text
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| 6 |
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| 7 | ;--------------------------------------------------------------------
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| 8 | ; Prints trying to boot string.
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| 9 | ;
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| 10 | ; BootPrint_TryToBootFromDL
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| 11 | ; Parameters:
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| 12 | ; DL: Drive to boot from (translated, 00h or 80h)
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| 13 | ; DS: RAMVARS segment
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| 14 | ; Returns:
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| 15 | ; Nothing
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| 16 | ; Corrupts registers:
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| 17 | ; AX, CX, SI, DI
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| 18 | ;--------------------------------------------------------------------
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| 19 | ALIGN JUMP_ALIGN
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| 20 | BootPrint_TryToBootFromDL:
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| 21 | push dx
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| 22 | ePUSH_T ax, BootPrint_PopDxAndReturn ; Return address
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| 23 |
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| 24 | xor dh, dh ; Translated drive number to DX
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| 25 | push dx ; Push translated drive number
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| 26 | call DriveXlate_ToOrBack
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| 27 | push dx ; Push untranslated drive number
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| 28 |
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| 29 | mov ax, g_szFloppyDrv ; Assume "Floppy Drive"
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| 30 | test dl, 80h ; Hard Disk?
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| 31 | jz SHORT .PushHardOrFloppy
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| 32 | add ax, BYTE g_szHardDrv - g_szFloppyDrv
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| 33 | .PushHardOrFloppy:
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| 34 | push ax
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| 35 |
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| 36 | mov si, g_szTryToBoot
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| 37 | mov dh, 6 ; 6 bytes pushed to stack
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| 38 | jmp PrintString_JumpToFormat
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| 39 |
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| 40 | ALIGN JUMP_ALIGN
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| 41 | BootPrint_PopDxAndReturn:
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| 42 | pop dx
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| 43 | ret
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| 44 |
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| 45 |
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| 46 | ;--------------------------------------------------------------------
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| 47 | ; Prints message that valid boot sector has been found.
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| 48 | ;
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| 49 | ; BootPrint_BootSectorLoaded
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| 50 | ; Parameters:
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| 51 | ; Nothing
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| 52 | ; Returns:
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| 53 | ; Nothing
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| 54 | ; Corrupts registers:
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| 55 | ; AX, CX, SI
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| 56 | ;--------------------------------------------------------------------
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| 57 | ALIGN JUMP_ALIGN
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| 58 | BootPrint_BootSectorLoaded:
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| 59 | push dx
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| 60 | ePUSH_T ax, BootPrint_PopDxAndReturn ; Return address
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| 61 |
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| 62 | ePUSH_T ax, g_szFound
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| 63 | jmp SHORT BootPrint_MsgCodeShared
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| 64 |
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| 65 |
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| 66 | ;--------------------------------------------------------------------
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| 67 | ; Prints message that first sector is not boot sector.
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| 68 | ;
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| 69 | ; BootPrint_FirstSectorNotBootable
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| 70 | ; Parameters:
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| 71 | ; Nothing
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| 72 | ; Returns:
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| 73 | ; Nothing
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| 74 | ; Corrupts registers:
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| 75 | ; AX, CX, DX, SI
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| 76 | ;--------------------------------------------------------------------
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| 77 | ALIGN JUMP_ALIGN
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| 78 | BootPrint_FirstSectorNotBootable:
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| 79 | ePUSH_T ax, g_szNotFound
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| 80 | BootPrint_MsgCodeShared:
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| 81 | ePUSH_T ax, g_szBootSector
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| 82 | mov si, g_szSectRead
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| 83 | mov dh, 4 ; 4 bytes pushed to stack
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| 84 | jmp PrintString_JumpToFormat
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| 85 |
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| 86 |
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| 87 | ;--------------------------------------------------------------------
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| 88 | ; Prints error code for failed first sector read attempt.
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| 89 | ;
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| 90 | ; BootPrint_FailedToLoadFirstSector
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| 91 | ; Parameters:
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| 92 | ; AH: INT 13h error code
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| 93 | ; Returns:
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| 94 | ; Nothing
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| 95 | ; Corrupts registers:
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| 96 | ; AX, CX, DX, SI
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| 97 | ;--------------------------------------------------------------------
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| 98 | ALIGN JUMP_ALIGN
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| 99 | BootPrint_FailedToLoadFirstSector:
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| 100 | eMOVZX cx, ah ; Error code to CX
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| 101 | push cx ; Push INT 13h error code
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| 102 | mov si, g_szReadError
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| 103 | mov dh, 2 ; 2 bytes pushed to stack
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| 104 | jmp PrintString_JumpToFormat
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