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 |
---|
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 |
---|
24 | cmp cx, BYTE NO_ITEM_SELECTED |
---|
25 | je SHORT BootMenu_DisplayAndReturnSelection ; Clear screen and display menu |
---|
26 | jmp SHORT BootMenu_ConvertMenuitemFromCXtoDriveInDX |
---|
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 | ;-------------------------------------------------------------------- |
---|
40 | ALIGN JUMP_ALIGN |
---|
41 | BootMenu_Enter: |
---|
42 | mov bx, BootMenuEvent_Handler |
---|
43 | CALL_MENU_LIBRARY DisplayWithHandlerInBXandUserDataInDXAX |
---|
44 | xchg cx, ax |
---|
45 | ret |
---|
46 | |
---|
47 | |
---|
48 | ;-------------------------------------------------------------------- |
---|
49 | ; Returns number of menuitems in Boot Menu. |
---|
50 | ; |
---|
51 | ; BootMenu_GetMenuitemCountToAX |
---|
52 | ; Parameters: |
---|
53 | ; DS: RAMVARS segment |
---|
54 | ; Returns: |
---|
55 | ; AX: Number of boot menu items |
---|
56 | ; Corrupts registers: |
---|
57 | ; CX |
---|
58 | ;-------------------------------------------------------------------- |
---|
59 | ALIGN JUMP_ALIGN |
---|
60 | BootMenu_GetMenuitemCountToAX: |
---|
61 | call RamVars_GetHardDiskCountFromBDAtoCX |
---|
62 | xchg ax, cx |
---|
63 | call FloppyDrive_GetCountToCX |
---|
64 | add ax, cx |
---|
65 | ret |
---|
66 | |
---|
67 | |
---|
68 | ;-------------------------------------------------------------------- |
---|
69 | ; BootMenu_GetHeightToAHwithItemCountInAL |
---|
70 | ; Parameters: |
---|
71 | ; AL: Number of menuitems |
---|
72 | ; Returns: |
---|
73 | ; AH: Boot menu height |
---|
74 | ; Corrupts registers: |
---|
75 | ; AL, CX, DI |
---|
76 | ;-------------------------------------------------------------------- |
---|
77 | ALIGN JUMP_ALIGN |
---|
78 | BootMenu_GetHeightToAHwithItemCountInAL: |
---|
79 | xchg cx, ax |
---|
80 | add cl, BOOT_MENU_HEIGHT_WITHOUT_ITEMS |
---|
81 | CALL_DISPLAY_LIBRARY GetColumnsToALandRowsToAH |
---|
82 | sub ah, MENU_SCREEN_BOTTOM_LINES*2 ; Leave space for bottom info |
---|
83 | MIN_U ah, cl |
---|
84 | ret |
---|
85 | |
---|
86 | |
---|
87 | ;-------------------------------------------------------------------- |
---|
88 | ; BootMenu_ConvertAsciiHotkeyFromALtoMenuitemInCX |
---|
89 | ; Parameters: |
---|
90 | ; AL: ASCII hotkey starting from upper case 'A' |
---|
91 | ; Returns: |
---|
92 | ; CX: Menuitem index |
---|
93 | ; Corrupts registers: |
---|
94 | ; AX |
---|
95 | ;-------------------------------------------------------------------- |
---|
96 | ALIGN JUMP_ALIGN |
---|
97 | BootMenu_ConvertAsciiHotkeyFromALtoMenuitemInCX: |
---|
98 | call BootMenu_GetLetterForFirstHardDiskToCL |
---|
99 | cmp al, cl ; Letter is for Hard Disk? |
---|
100 | jae SHORT .StartFromHardDiskLetter |
---|
101 | sub al, 'A' ; Letter to Floppy Drive menuitem |
---|
102 | xchg ax, cx ; Menuitem index to CX |
---|
103 | ret |
---|
104 | ALIGN JUMP_ALIGN |
---|
105 | .StartFromHardDiskLetter: |
---|
106 | sub al, cl ; Hard Disk index |
---|
107 | call FloppyDrive_GetCountToCX |
---|
108 | add cx, ax ; Menuitem index |
---|
109 | ret |
---|
110 | |
---|
111 | ;-------------------------------------------------------------------- |
---|
112 | ; Returns letter for first hard disk. Usually it will be 'c' but it |
---|
113 | ; can be higher if more than two floppy drives are found. |
---|
114 | ; |
---|
115 | ; BootMenu_GetLetterForFirstHardDiskToCL |
---|
116 | ; Parameters: |
---|
117 | ; Nothing |
---|
118 | ; Returns: |
---|
119 | ; CL: Upper case letter for first hard disk |
---|
120 | ; Corrupts registers: |
---|
121 | ; CH |
---|
122 | ;-------------------------------------------------------------------- |
---|
123 | ALIGN JUMP_ALIGN |
---|
124 | BootMenu_GetLetterForFirstHardDiskToCL: |
---|
125 | call FloppyDrive_GetCountToCX |
---|
126 | add cl, 'A' |
---|
127 | MAX_U cl, 'C' |
---|
128 | ret |
---|
129 | |
---|
130 | |
---|
131 | ;-------------------------------------------------------------------- |
---|
132 | ; BootMenu_ConvertMenuitemFromCXtoDriveInDX |
---|
133 | ; Parameters: |
---|
134 | ; CX: Index of menuitem selected from Boot Menu |
---|
135 | ; DS: RAMVARS segment |
---|
136 | ; Returns: |
---|
137 | ; DX: Drive number to be used for booting |
---|
138 | ; Corrupts registers: |
---|
139 | ; CX |
---|
140 | ;-------------------------------------------------------------------- |
---|
141 | ALIGN JUMP_ALIGN |
---|
142 | BootMenu_ConvertMenuitemFromCXtoDriveInDX: |
---|
143 | mov dx, cx ; Copy menuitem index to DX |
---|
144 | call FloppyDrive_GetCountToCX |
---|
145 | cmp dx, cx ; Floppy drive? |
---|
146 | jb SHORT .ReturnFloppyDriveInDX |
---|
147 | sub dx, cx ; Remove floppy drives from index |
---|
148 | or dl, 80h |
---|
149 | .ReturnFloppyDriveInDX: |
---|
150 | ret |
---|
151 | |
---|
152 | |
---|
153 | ;-------------------------------------------------------------------- |
---|
154 | ; BootMenu_GetMenuitemToDXforDriveInDL |
---|
155 | ; Parameters: |
---|
156 | ; DL: Drive number |
---|
157 | ; Returns: |
---|
158 | ; DX: Menuitem index (assuming drive is available) |
---|
159 | ; Corrupts registers: |
---|
160 | ; Nothing |
---|
161 | ;-------------------------------------------------------------------- |
---|
162 | ALIGN JUMP_ALIGN |
---|
163 | BootMenu_GetMenuitemToDXforDriveInDL: |
---|
164 | xor dh, dh ; Drive number now in DX |
---|
165 | test dl, 80h |
---|
166 | jz SHORT .ReturnItemIndexInDX ; Return if floppy drive (HD bit not set) |
---|
167 | call FloppyDrive_GetCountToCX |
---|
168 | add dx, cx |
---|
169 | .ReturnItemIndexInDX: |
---|
170 | ret |
---|
171 | |
---|
172 | |
---|
173 | ;-------------------------------------------------------------------- |
---|
174 | ; Checks is drive number valid for this system. |
---|
175 | ; |
---|
176 | ; BootMenu_IsDriveInSystem |
---|
177 | ; Parameters: |
---|
178 | ; DL: Drive number |
---|
179 | ; DS: RAMVARS segment |
---|
180 | ; Returns: |
---|
181 | ; CF: Set if drive number is valid |
---|
182 | ; Clear if drive is not present in system |
---|
183 | ; Corrupts registers: |
---|
184 | ; AX, CX |
---|
185 | ;-------------------------------------------------------------------- |
---|
186 | ALIGN JUMP_ALIGN |
---|
187 | BootMenu_IsDriveInSystem: |
---|
188 | test dl, 80h ; Floppy drive? |
---|
189 | jz SHORT .IsFloppyDriveIsInSystem |
---|
190 | call RamVars_GetHardDiskCountFromBDAtoCX ; Hard Disk count to CX |
---|
191 | or cl, 80h ; Set Hard Disk bit to CX |
---|
192 | jmp SHORT .CompareDriveNumberToDriveCount |
---|
193 | .IsFloppyDriveIsInSystem: |
---|
194 | call FloppyDrive_GetCountToCX |
---|
195 | .CompareDriveNumberToDriveCount: |
---|
196 | cmp dl, cl ; Set CF when DL is smaller |
---|
197 | ret |
---|