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