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