| 1 | ; Project name : XTIDE Universal BIOS
|
|---|
| 2 | ; Description : Displays Boot Menu.
|
|---|
| 3 |
|
|---|
| 4 | ; Section containing code
|
|---|
| 5 | SECTION .text
|
|---|
| 6 |
|
|---|
| 7 | ;--------------------------------------------------------------------
|
|---|
| 8 | ; Displays Boot Menu and returns Drive or Function number.
|
|---|
| 9 | ;
|
|---|
| 10 | ; BootMenu_DisplayAndReturnSelection
|
|---|
| 11 | ; Parameters:
|
|---|
| 12 | ; DS: RAMVARS segment
|
|---|
| 13 | ; Returns:
|
|---|
| 14 | ; DX: Untranslated drive number to be used for booting (if CF cleared)
|
|---|
| 15 | ; Function number (if CF set)
|
|---|
| 16 | ; CF: Cleared if drive selected
|
|---|
| 17 | ; Set if function selected
|
|---|
| 18 | ; Corrupts registers:
|
|---|
| 19 | ; All General Purpose Registers
|
|---|
| 20 | ;--------------------------------------------------------------------
|
|---|
| 21 | ALIGN JUMP_ALIGN
|
|---|
| 22 | BootMenu_DisplayAndReturnSelection:
|
|---|
| 23 | call DriveXlate_Reset
|
|---|
| 24 | call BootMenuPrint_TheBottomOfScreen
|
|---|
| 25 | call BootMenu_Enter ; Get selected menuitem index to CX
|
|---|
| 26 | call BootMenuPrint_ClearScreen
|
|---|
| 27 | cmp cx, BYTE NO_ITEM_SELECTED
|
|---|
| 28 | je SHORT BootMenu_DisplayAndReturnSelection
|
|---|
| 29 | jmp SHORT BootMenu_ConvertMenuitemFromCXtoDriveInDX
|
|---|
| 30 |
|
|---|
| 31 |
|
|---|
| 32 | ;--------------------------------------------------------------------
|
|---|
| 33 | ; Enters Boot Menu or submenu.
|
|---|
| 34 | ;
|
|---|
| 35 | ; BootMenu_Enter
|
|---|
| 36 | ; Parameters:
|
|---|
| 37 | ; Nothing
|
|---|
| 38 | ; Returns:
|
|---|
| 39 | ; CX: Index of selected item or NO_ITEM_SELECTED
|
|---|
| 40 | ; Corrupts registers:
|
|---|
| 41 | ; BX, DI
|
|---|
| 42 | ;--------------------------------------------------------------------
|
|---|
| 43 | ALIGN JUMP_ALIGN
|
|---|
| 44 | BootMenu_Enter:
|
|---|
| 45 | mov bx, BootMenuEvent_Handler
|
|---|
| 46 | CALL_MENU_LIBRARY DisplayWithHandlerInBXandUserDataInDXAX
|
|---|
| 47 | xchg cx, ax
|
|---|
| 48 | ret
|
|---|
| 49 |
|
|---|
| 50 |
|
|---|
| 51 | ;--------------------------------------------------------------------
|
|---|
| 52 | ; Returns number of menuitems in Boot Menu.
|
|---|
| 53 | ;
|
|---|
| 54 | ; BootMenu_GetMenuitemCountToCX
|
|---|
| 55 | ; Parameters:
|
|---|
| 56 | ; DS: RAMVARS segment
|
|---|
| 57 | ; Returns:
|
|---|
| 58 | ; CX: Number of boot menu items
|
|---|
| 59 | ; Corrupts registers:
|
|---|
| 60 | ; AX
|
|---|
| 61 | ;--------------------------------------------------------------------
|
|---|
| 62 | ALIGN JUMP_ALIGN
|
|---|
| 63 | BootMenu_GetMenuitemCountToCX:
|
|---|
| 64 | call RamVars_GetHardDiskCountFromBDAtoCX
|
|---|
| 65 | xchg ax, cx
|
|---|
| 66 | call FloppyDrive_GetCount
|
|---|
| 67 | add ax, cx
|
|---|
| 68 | ret
|
|---|
| 69 |
|
|---|
| 70 |
|
|---|
| 71 | ;--------------------------------------------------------------------
|
|---|
| 72 | ; BootMenu_GetHeightToALwithItemCountInCL
|
|---|
| 73 | ; Parameters:
|
|---|
| 74 | ; CL: Number of menuitems
|
|---|
| 75 | ; Returns:
|
|---|
| 76 | ; AH: Boot menu height
|
|---|
| 77 | ; Corrupts registers:
|
|---|
| 78 | ; AL, CL, DI
|
|---|
| 79 | ;--------------------------------------------------------------------
|
|---|
| 80 | ALIGN JUMP_ALIGN
|
|---|
| 81 | BootMenu_GetHeightToAHwithItemCountInCL:
|
|---|
| 82 | add cl, BOOT_MENU_HEIGHT_WITHOUT_ITEMS
|
|---|
| 83 | CALL_DISPLAY_LIBRARY GetColumnsToALandRowsToAH
|
|---|
| 84 | MIN_U ah, cl
|
|---|
| 85 | ret
|
|---|
| 86 |
|
|---|
| 87 |
|
|---|
| 88 | ;--------------------------------------------------------------------
|
|---|
| 89 | ; BootMenu_ConvertAsciiHotkeyFromALtoMenuitemInCX
|
|---|
| 90 | ; Parameters:
|
|---|
| 91 | ; AL: ASCII hotkey starting from upper case 'A'
|
|---|
| 92 | ; Returns:
|
|---|
| 93 | ; CX: Menuitem index
|
|---|
| 94 | ; Corrupts registers:
|
|---|
| 95 | ; AX
|
|---|
| 96 | ;--------------------------------------------------------------------
|
|---|
| 97 | ALIGN JUMP_ALIGN
|
|---|
| 98 | BootMenu_ConvertAsciiHotkeyFromALtoMenuitemInCX:
|
|---|
| 99 | call BootMenu_GetLetterForFirstHardDiskToCL
|
|---|
| 100 | cmp al, cl ; Letter is for Hard Disk?
|
|---|
| 101 | jae SHORT .StartFromHardDiskLetter
|
|---|
| 102 | sub al, 'A' ; Letter to Floppy Drive menuitem
|
|---|
| 103 | xchg ax, cx ; Menuitem index to CX
|
|---|
| 104 | ret
|
|---|
| 105 | ALIGN JUMP_ALIGN
|
|---|
| 106 | .StartFromHardDiskLetter:
|
|---|
| 107 | sub al, cl ; Hard Disk index
|
|---|
| 108 | call FloppyDrive_GetCount
|
|---|
| 109 | add cx, ax ; Menuitem index
|
|---|
| 110 | ret
|
|---|
| 111 |
|
|---|
| 112 | ;--------------------------------------------------------------------
|
|---|
| 113 | ; Returns letter for first hard disk. Usually it will be 'c' but it
|
|---|
| 114 | ; can be higher if more than two floppy drives are found.
|
|---|
| 115 | ;
|
|---|
| 116 | ; BootMenu_GetLetterForFirstHardDiskToCL
|
|---|
| 117 | ; Parameters:
|
|---|
| 118 | ; Nothing
|
|---|
| 119 | ; Returns:
|
|---|
| 120 | ; CL: Upper case letter for first hard disk
|
|---|
| 121 | ; Corrupts registers:
|
|---|
| 122 | ; CH
|
|---|
| 123 | ;--------------------------------------------------------------------
|
|---|
| 124 | ALIGN JUMP_ALIGN
|
|---|
| 125 | BootMenu_GetLetterForFirstHardDiskToCL:
|
|---|
| 126 | call FloppyDrive_GetCount
|
|---|
| 127 | add cl, 'A'
|
|---|
| 128 | MAX_U cl, 'C'
|
|---|
| 129 | ret
|
|---|
| 130 |
|
|---|
| 131 |
|
|---|
| 132 | ;--------------------------------------------------------------------
|
|---|
| 133 | ; BootMenu_ConvertMenuitemFromCXtoDriveInDX
|
|---|
| 134 | ; Parameters:
|
|---|
| 135 | ; CX: Index of menuitem selected from Boot Menu
|
|---|
| 136 | ; DS: RAMVARS segment
|
|---|
| 137 | ; Returns:
|
|---|
| 138 | ; DX: Drive number to be used for booting
|
|---|
| 139 | ; Corrupts registers:
|
|---|
| 140 | ; CX
|
|---|
| 141 | ;--------------------------------------------------------------------
|
|---|
| 142 | ALIGN JUMP_ALIGN
|
|---|
| 143 | BootMenu_ConvertMenuitemFromCXtoDriveInDX:
|
|---|
| 144 | mov dx, cx ; Copy menuitem index to DX
|
|---|
| 145 | call FloppyDrive_GetCount
|
|---|
| 146 | cmp dx, cx ; Floppy drive?
|
|---|
| 147 | jb SHORT .ReturnFloppyDriveInDX
|
|---|
| 148 | sub dx, cx ; Remove floppy drives from index
|
|---|
| 149 | or dl, 80h
|
|---|
| 150 | .ReturnFloppyDriveInDX:
|
|---|
| 151 | ret
|
|---|
| 152 |
|
|---|
| 153 |
|
|---|
| 154 | ;--------------------------------------------------------------------
|
|---|
| 155 | ; Converts Floppy or Hard Disk Drive number to menuitem index.
|
|---|
| 156 | ; This function does not check does the drive really exists.
|
|---|
| 157 | ;
|
|---|
| 158 | ; BootMenu_ConvertDriveToMenuitem
|
|---|
| 159 | ; Parameters:
|
|---|
| 160 | ; DL: Drive number
|
|---|
| 161 | ; Returns:
|
|---|
| 162 | ; CX: Menuitem index (assuming drive is available)
|
|---|
| 163 | ; Corrupts registers:
|
|---|
| 164 | ; AX
|
|---|
| 165 | ;--------------------------------------------------------------------
|
|---|
| 166 | ALIGN JUMP_ALIGN
|
|---|
| 167 | BootMenu_ConvertDriveToMenuitem:
|
|---|
| 168 | test dl, 80h ; Floppy drive?
|
|---|
| 169 | jz SHORT .ReturnFloppyMenuitem
|
|---|
| 170 | call FloppyDrive_GetCount
|
|---|
| 171 | mov ax, 7Fh ; Load mask to clear floppy bit
|
|---|
| 172 | and ax, dx ; AX = Hard Disk index
|
|---|
| 173 | add cx, ax ; Add hard disk index to floppy drive count
|
|---|
| 174 | ret
|
|---|
| 175 | ALIGN JUMP_ALIGN
|
|---|
| 176 | .ReturnFloppyMenuitem:
|
|---|
| 177 | eMOVZX cx, dl ; Drive number and item index are equal
|
|---|
| 178 | ret
|
|---|
| 179 |
|
|---|
| 180 |
|
|---|
| 181 | ;--------------------------------------------------------------------
|
|---|
| 182 | ; Checks is drive number valid for this system.
|
|---|
| 183 | ;
|
|---|
| 184 | ; BootMenu_IsDriveInSystem
|
|---|
| 185 | ; Parameters:
|
|---|
| 186 | ; DL: Drive number
|
|---|
| 187 | ; DS: RAMVARS segment
|
|---|
| 188 | ; Returns:
|
|---|
| 189 | ; CF: Set if drive number is valid
|
|---|
| 190 | ; Clear if drive is not present in system
|
|---|
| 191 | ; Corrupts registers:
|
|---|
| 192 | ; AX, CX
|
|---|
| 193 | ;--------------------------------------------------------------------
|
|---|
| 194 | ALIGN JUMP_ALIGN
|
|---|
| 195 | BootMenu_IsDriveInSystem:
|
|---|
| 196 | test dl, 80h ; Floppy drive?
|
|---|
| 197 | jz SHORT .IsFloppyDriveIsInSystem
|
|---|
| 198 | call RamVars_GetHardDiskCountFromBDAtoCX ; Hard Disk count to CX
|
|---|
| 199 | or cl, 80h ; Set Hard Disk bit to CX
|
|---|
| 200 | jmp SHORT .CompareDriveNumberToDriveCount
|
|---|
| 201 | .IsFloppyDriveIsInSystem:
|
|---|
| 202 | call FloppyDrive_GetCount ; Floppy Drive count to CX
|
|---|
| 203 | .CompareDriveNumberToDriveCount:
|
|---|
| 204 | cmp dl, cl
|
|---|
| 205 | ret
|
|---|
