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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