[3] | 1 | ; File name : BootMenu.asm |
---|
| 2 | ; Project name : IDE BIOS |
---|
| 3 | ; Created date : 25.3.2010 |
---|
[28] | 4 | ; Last update : 29.7.2010 |
---|
[3] | 5 | ; Author : Tomi Tilli |
---|
| 6 | ; Description : Displays Boot Menu. |
---|
| 7 | |
---|
| 8 | ; Section containing code |
---|
| 9 | SECTION .text |
---|
| 10 | |
---|
| 11 | ;-------------------------------------------------------------------- |
---|
| 12 | ; Displays Boot Menu and returns Drive or Function number. |
---|
| 13 | ; |
---|
| 14 | ; BootMenu_DisplayAndReturnSelection |
---|
| 15 | ; Parameters: |
---|
| 16 | ; DS: RAMVARS segment |
---|
| 17 | ; Returns: |
---|
| 18 | ; DX: Untranslated drive number to be used for booting (if CF cleared) |
---|
| 19 | ; Function number (if CF set) |
---|
| 20 | ; CF: Cleared if drive selected |
---|
| 21 | ; Set if function selected |
---|
| 22 | ; Corrupts registers: |
---|
| 23 | ; All General Purpose Registers |
---|
| 24 | ;-------------------------------------------------------------------- |
---|
| 25 | ALIGN JUMP_ALIGN |
---|
| 26 | BootMenu_DisplayAndReturnSelection: |
---|
| 27 | call DriveXlate_Reset |
---|
| 28 | call BootMenuPrint_TheBottomOfScreen |
---|
| 29 | call BootMenu_GetMenuitemCount |
---|
| 30 | mov di, BootMenuEvent_Handler |
---|
| 31 | call BootMenu_Enter ; Get selected menuitem index to CX |
---|
| 32 | call BootMenuPrint_ClearScreen |
---|
| 33 | cmp cx, BYTE 0 ; -1 if nothing selected (ESC pressed) |
---|
| 34 | jl SHORT BootMenu_DisplayAndReturnSelection |
---|
| 35 | call BootMenu_CheckAndConvertHotkeyToMenuitem |
---|
| 36 | jc SHORT .SetDriveTranslationForHotkey |
---|
| 37 | jmp BootMenu_ConvertMenuitemToDriveOrFunction |
---|
| 38 | ALIGN JUMP_ALIGN |
---|
| 39 | .SetDriveTranslationForHotkey: |
---|
| 40 | call BootMenu_ConvertMenuitemToDriveOrFunction |
---|
| 41 | call DriveXlate_SetDriveToSwap |
---|
| 42 | clc |
---|
| 43 | ret |
---|
| 44 | |
---|
| 45 | |
---|
| 46 | ;-------------------------------------------------------------------- |
---|
| 47 | ; Returns number of menuitems in Boot Menu. |
---|
| 48 | ; |
---|
| 49 | ; BootMenu_GetMenuitemCount |
---|
| 50 | ; Parameters: |
---|
| 51 | ; DS: RAMVARS segment |
---|
| 52 | ; Returns: |
---|
| 53 | ; CX: Number of boot menu items |
---|
| 54 | ; Corrupts registers: |
---|
| 55 | ; AX |
---|
| 56 | ;-------------------------------------------------------------------- |
---|
| 57 | ALIGN JUMP_ALIGN |
---|
| 58 | BootMenu_GetMenuitemCount: |
---|
| 59 | call RamVars_GetDriveCounts |
---|
| 60 | mov ax, cx |
---|
| 61 | call FloppyDrive_GetCount |
---|
| 62 | add ax, cx |
---|
| 63 | call BootMenu_GetMenuFunctionCount |
---|
| 64 | add cx, ax |
---|
| 65 | ret |
---|
| 66 | |
---|
| 67 | ;-------------------------------------------------------------------- |
---|
| 68 | ; Returns number of functions displayed in Boot Menu. |
---|
| 69 | ; |
---|
| 70 | ; BootMenu_GetMenuFunctionCount |
---|
| 71 | ; Parameters: |
---|
| 72 | ; Nothing |
---|
| 73 | ; Returns: |
---|
| 74 | ; CX: Number of boot menu functions |
---|
| 75 | ; Corrupts registers: |
---|
| 76 | ; Nothing |
---|
| 77 | ;-------------------------------------------------------------------- |
---|
| 78 | ALIGN JUMP_ALIGN |
---|
| 79 | BootMenu_GetMenuFunctionCount: |
---|
| 80 | xor cx, cx |
---|
| 81 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_ROMBOOT |
---|
| 82 | jz SHORT .DontIncludeRomBoot |
---|
| 83 | inc cx |
---|
| 84 | ALIGN JUMP_ALIGN |
---|
| 85 | .DontIncludeRomBoot: |
---|
| 86 | ret |
---|
| 87 | |
---|
| 88 | |
---|
| 89 | ;-------------------------------------------------------------------- |
---|
| 90 | ; Enters Boot Menu or submenu. |
---|
| 91 | ; |
---|
| 92 | ; BootMenu_Enter |
---|
| 93 | ; Parameters: |
---|
| 94 | ; CX: Number of menuitems in menu |
---|
| 95 | ; DS:SI: User specific far pointer |
---|
| 96 | ; CS:DI: Pointer to menu event handler function |
---|
| 97 | ; Returns: |
---|
| 98 | ; CX: Index of last pointed Menuitem (not necessary selected with ENTER) |
---|
| 99 | ; FFFFh if cancelled with ESC |
---|
| 100 | ; Corrupts registers: |
---|
| 101 | ; AX, BX, DX |
---|
| 102 | ;-------------------------------------------------------------------- |
---|
| 103 | ALIGN JUMP_ALIGN |
---|
| 104 | BootMenu_Enter: |
---|
| 105 | call BootMenu_GetSelectionTimeout |
---|
| 106 | call BootMenu_GetSize |
---|
| 107 | MIN_U ah, [cs:ROMVARS.bBootMnuH] ; Limit to max height |
---|
| 108 | jmp Menu_Enter |
---|
| 109 | |
---|
| 110 | ;-------------------------------------------------------------------- |
---|
| 111 | ; Returns Boot Menu selection timeout in milliseconds. |
---|
| 112 | ; |
---|
| 113 | ; BootMenu_GetSelectionTimeout |
---|
| 114 | ; Parameters: |
---|
| 115 | ; Nothing |
---|
| 116 | ; Returns: |
---|
| 117 | ; DX: Selection timeout in millisecs |
---|
| 118 | ; Corrupts registers: |
---|
| 119 | ; AX |
---|
| 120 | ;-------------------------------------------------------------------- |
---|
| 121 | ALIGN JUMP_ALIGN |
---|
| 122 | BootMenu_GetSelectionTimeout: |
---|
| 123 | mov ax, 1000 ; Seconds to milliseconds |
---|
| 124 | eMOVZX dx, BYTE [cs:ROMVARS.bBootDelay] |
---|
| 125 | mul dx ; AX = seconds * milliseconds_per_second |
---|
| 126 | xchg ax, dx ; DX = Timeout in millisecs |
---|
| 127 | ret |
---|
| 128 | |
---|
| 129 | ;-------------------------------------------------------------------- |
---|
| 130 | ; Returns Boot Menu size. |
---|
| 131 | ; |
---|
| 132 | ; BootMenu_GetSize |
---|
| 133 | ; Parameters: |
---|
| 134 | ; Nothing |
---|
| 135 | ; Returns: |
---|
| 136 | ; AL: Menu width with borders included (characters) |
---|
| 137 | ; AH: Menu height with borders included (characters) |
---|
| 138 | ; BL: Title line count |
---|
| 139 | ; BH: Info line count |
---|
| 140 | ; Corrupts registers: |
---|
| 141 | ; Nothing |
---|
| 142 | ;-------------------------------------------------------------------- |
---|
| 143 | ALIGN JUMP_ALIGN |
---|
| 144 | BootMenu_GetSize: |
---|
| 145 | mov al, MENU_WIDTH_IN_CHARS |
---|
| 146 | mov ah, cl ; Copy menuitem count to AH |
---|
| 147 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_DRVNFO |
---|
| 148 | jz SHORT .GetHeightWithoutInfoArea |
---|
| 149 | ;.GetHeightWithInfoArea: |
---|
| 150 | add ah, MENU_HEIGHT_IN_CHARS_WITH_INFO |
---|
| 151 | mov bx, (MENU_INFO_LINE_CNT<<8) | MENU_TITLE_LINE_CNT |
---|
| 152 | ret |
---|
| 153 | ALIGN JUMP_ALIGN |
---|
| 154 | .GetHeightWithoutInfoArea: |
---|
| 155 | add ah, MENU_HEIGHT_IN_CHARS_WITHOUT_INFO |
---|
| 156 | mov bx, MENU_TITLE_LINE_CNT |
---|
| 157 | ret |
---|
| 158 | |
---|
| 159 | |
---|
| 160 | ;-------------------------------------------------------------------- |
---|
| 161 | ; Checks if hotkey has been pressed on Boot Menu. |
---|
| 162 | ; If it has been, it will be converted to menuitem index. |
---|
| 163 | ; |
---|
| 164 | ; BootMenu_CheckAndConvertHotkeyToMenuitem |
---|
| 165 | ; Parameters: |
---|
| 166 | ; CX: Menuitem index (if no hotkey) |
---|
| 167 | ; Returns: |
---|
| 168 | ; CX: Menuitem index |
---|
| 169 | ; CF: Set if hotkey has been pressed |
---|
| 170 | ; Cleared if no hotkey selection |
---|
| 171 | ; Corrupts registers: |
---|
| 172 | ; AX |
---|
| 173 | ;-------------------------------------------------------------------- |
---|
| 174 | ALIGN JUMP_ALIGN |
---|
| 175 | BootMenu_CheckAndConvertHotkeyToMenuitem: |
---|
| 176 | push es |
---|
| 177 | LOAD_BDA_SEGMENT_TO es, ax ; Zero AX |
---|
| 178 | xchg al, [es:BOOTVARS.bMenuHotkey] ; Load and clear hotkey |
---|
| 179 | test al, al ; No hotkey? (clears CF) |
---|
| 180 | jz SHORT .Return |
---|
| 181 | call BootMenu_ConvertHotkeyToMenuitem |
---|
| 182 | stc |
---|
| 183 | ALIGN JUMP_ALIGN |
---|
| 184 | .Return: |
---|
| 185 | pop es |
---|
| 186 | ret |
---|
| 187 | |
---|
| 188 | ;-------------------------------------------------------------------- |
---|
| 189 | ; Converts any hotkey to Boot Menu menuitem index. |
---|
| 190 | ; |
---|
| 191 | ; BootMenu_ConvertHotkeyToMenuitem |
---|
| 192 | ; Parameters: |
---|
| 193 | ; AX: ASCII hotkey starting from upper case 'A' |
---|
| 194 | ; Returns: |
---|
| 195 | ; CX: Menuitem index |
---|
| 196 | ; Corrupts registers: |
---|
| 197 | ; AX |
---|
| 198 | ;-------------------------------------------------------------------- |
---|
| 199 | ALIGN JUMP_ALIGN |
---|
| 200 | BootMenu_ConvertHotkeyToMenuitem: |
---|
| 201 | call BootMenu_GetLetterForFirstHardDisk |
---|
| 202 | cmp al, cl ; Letter is for Hard Disk? |
---|
| 203 | jae SHORT .StartFromHardDiskLetter |
---|
| 204 | sub al, 'A' ; Letter to Floppy Drive menuitem |
---|
| 205 | xchg ax, cx ; Menuitem index to CX |
---|
| 206 | ret |
---|
| 207 | ALIGN JUMP_ALIGN |
---|
| 208 | .StartFromHardDiskLetter: |
---|
| 209 | sub al, cl ; Hard Disk index |
---|
| 210 | call FloppyDrive_GetCount |
---|
| 211 | add cx, ax ; Menuitem index |
---|
| 212 | ret |
---|
| 213 | |
---|
| 214 | ;-------------------------------------------------------------------- |
---|
| 215 | ; Returns letter for first hard disk. Usually it will be 'c' but it |
---|
| 216 | ; can be higher if more than two floppy drives are found. |
---|
| 217 | ; |
---|
| 218 | ; BootMenu_GetLetterForFirstHardDisk |
---|
| 219 | ; Parameters: |
---|
| 220 | ; Nothing |
---|
| 221 | ; Returns: |
---|
| 222 | ; CL: Upper case letter for first hard disk |
---|
| 223 | ; Corrupts registers: |
---|
| 224 | ; CH |
---|
| 225 | ;-------------------------------------------------------------------- |
---|
| 226 | ALIGN JUMP_ALIGN |
---|
| 227 | BootMenu_GetLetterForFirstHardDisk: |
---|
| 228 | call FloppyDrive_GetCount |
---|
| 229 | add cl, 'A' |
---|
| 230 | MAX_U cl, 'C' |
---|
| 231 | ret |
---|
| 232 | |
---|
| 233 | |
---|
| 234 | ;-------------------------------------------------------------------- |
---|
| 235 | ; Converts selected menuitem index to drive number or function ID. |
---|
| 236 | ; |
---|
| 237 | ; BootMenu_ConvertMenuitemToDriveOrFunction |
---|
| 238 | ; Parameters: |
---|
| 239 | ; CX: Index of menuitem selected from Boot Menu |
---|
| 240 | ; DS: RAMVARS segment |
---|
| 241 | ; Returns: |
---|
| 242 | ; DX: Drive number to be used for booting (if CF cleared) |
---|
| 243 | ; Function ID (if CF set) |
---|
| 244 | ; CF: Cleared if drive selected |
---|
| 245 | ; Set if function selected |
---|
| 246 | ; Corrupts registers: |
---|
| 247 | ; AX, CX |
---|
| 248 | ;-------------------------------------------------------------------- |
---|
| 249 | ALIGN JUMP_ALIGN |
---|
| 250 | BootMenu_ConvertMenuitemToDriveOrFunction: |
---|
| 251 | mov dx, cx ; Copy menuitem index to DX |
---|
| 252 | call FloppyDrive_GetCount |
---|
| 253 | cmp dx, cx ; Floppy drive? |
---|
| 254 | jb SHORT .ReturnFloppyDriveInDX |
---|
| 255 | sub dx, cx ; Remove floppy drives from index |
---|
| 256 | call RamVars_GetDriveCounts |
---|
| 257 | cmp dx, cx ; Hard disk? |
---|
| 258 | jb SHORT .ReturnHardDiskInDX |
---|
| 259 | sub dx, cx ; Remove hard disks from index |
---|
| 260 | jmp SHORT BootMenu_ConvertFunctionIndexToID |
---|
| 261 | ALIGN JUMP_ALIGN |
---|
| 262 | .ReturnHardDiskInDX: |
---|
| 263 | or dl, 80h |
---|
| 264 | ALIGN JUMP_ALIGN |
---|
| 265 | .ReturnFloppyDriveInDX: |
---|
| 266 | clc |
---|
| 267 | ret |
---|
| 268 | |
---|
| 269 | |
---|
| 270 | ;-------------------------------------------------------------------- |
---|
| 271 | ; Converts selected menuitem index to drive number or function ID. |
---|
| 272 | ; |
---|
| 273 | ; BootMenu_ConvertFunctionIndexToID |
---|
| 274 | ; Parameters: |
---|
| 275 | ; CX: Menuitem index |
---|
| 276 | ; DX: Function index (Menuitem index - floppy count - HD count) |
---|
| 277 | ; Returns: |
---|
| 278 | ; DX: Function ID |
---|
| 279 | ; CF: Set to indicate function |
---|
| 280 | ; Corrupts registers: |
---|
| 281 | ; AX, CX |
---|
| 282 | ;-------------------------------------------------------------------- |
---|
| 283 | ALIGN JUMP_ALIGN |
---|
| 284 | BootMenu_ConvertFunctionIndexToID: |
---|
| 285 | mov dx, ID_BOOTFUNC_ROMBOOT |
---|
| 286 | stc |
---|
| 287 | ret |
---|
| 288 | |
---|
| 289 | |
---|
| 290 | ;-------------------------------------------------------------------- |
---|
| 291 | ; Converts Floppy or Hard Disk Drive number to menuitem index. |
---|
| 292 | ; This function does not check does the drive really exists. |
---|
| 293 | ; |
---|
| 294 | ; BootMenu_ConvertDriveToMenuitem |
---|
| 295 | ; Parameters: |
---|
| 296 | ; DL: Drive number |
---|
| 297 | ; Returns: |
---|
| 298 | ; CX: Menuitem index (assuming drive is available) |
---|
| 299 | ; Corrupts registers: |
---|
| 300 | ; AX |
---|
| 301 | ;-------------------------------------------------------------------- |
---|
| 302 | ALIGN JUMP_ALIGN |
---|
| 303 | BootMenu_ConvertDriveToMenuitem: |
---|
| 304 | test dl, 80h ; Floppy drive? |
---|
| 305 | jz SHORT .ReturnFloppyMenuitem |
---|
| 306 | call FloppyDrive_GetCount |
---|
| 307 | mov ax, 7Fh ; Load mask to clear floppy bit |
---|
| 308 | and ax, dx ; AX = Hard Disk index |
---|
| 309 | add cx, ax ; Add hard disk index to floppy drive count |
---|
| 310 | ret |
---|
| 311 | ALIGN JUMP_ALIGN |
---|
| 312 | .ReturnFloppyMenuitem: |
---|
| 313 | eMOVZX cx, dl ; Drive number and item index are equal |
---|
| 314 | ret |
---|
| 315 | |
---|
| 316 | |
---|
| 317 | ;-------------------------------------------------------------------- |
---|
| 318 | ; Checks is drive number valid for this system. |
---|
| 319 | ; |
---|
| 320 | ; BootMenu_IsDriveInSystem |
---|
| 321 | ; Parameters: |
---|
| 322 | ; DL: Drive number |
---|
| 323 | ; DS: RAMVARS segment |
---|
| 324 | ; Returns: |
---|
[28] | 325 | ; CF: Set if drive number is valid |
---|
[3] | 326 | ; Clear if drive is not present in system |
---|
| 327 | ; Corrupts registers: |
---|
[28] | 328 | ; AX, CX |
---|
[3] | 329 | ;-------------------------------------------------------------------- |
---|
| 330 | ALIGN JUMP_ALIGN |
---|
| 331 | BootMenu_IsDriveInSystem: |
---|
| 332 | test dl, 80h ; Floppy drive? |
---|
| 333 | jz SHORT .IsFloppyDriveIsInSystem |
---|
[28] | 334 | call RamVars_GetDriveCounts ; Hard Disk count to CX |
---|
| 335 | or cl, 80h ; Set Hard Disk bit to CX |
---|
| 336 | jmp SHORT .CompareDriveNumberToDriveCount |
---|
[3] | 337 | .IsFloppyDriveIsInSystem: |
---|
[28] | 338 | call FloppyDrive_GetCount ; Floppy Drive count to CX |
---|
| 339 | .CompareDriveNumberToDriveCount: |
---|
[3] | 340 | cmp dl, cl |
---|
| 341 | ret |
---|