| 1 | ; File name : BootMenu.asm
|
|---|
| 2 | ; Project name : IDE BIOS
|
|---|
| 3 | ; Created date : 25.3.2010
|
|---|
| 4 | ; Last update : 3.8.2010
|
|---|
| 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_GetHardDiskCountFromBDAtoCX
|
|---|
| 60 | xchg 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_GetHardDiskCountFromBDAtoCX
|
|---|
| 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:
|
|---|
| 325 | ; CF: Set if drive number is valid
|
|---|
| 326 | ; Clear if drive is not present in system
|
|---|
| 327 | ; Corrupts registers:
|
|---|
| 328 | ; AX, CX
|
|---|
| 329 | ;--------------------------------------------------------------------
|
|---|
| 330 | ALIGN JUMP_ALIGN
|
|---|
| 331 | BootMenu_IsDriveInSystem:
|
|---|
| 332 | test dl, 80h ; Floppy drive?
|
|---|
| 333 | jz SHORT .IsFloppyDriveIsInSystem
|
|---|
| 334 | call RamVars_GetHardDiskCountFromBDAtoCX ; Hard Disk count to CX
|
|---|
| 335 | or cl, 80h ; Set Hard Disk bit to CX
|
|---|
| 336 | jmp SHORT .CompareDriveNumberToDriveCount
|
|---|
| 337 | .IsFloppyDriveIsInSystem:
|
|---|
| 338 | call FloppyDrive_GetCount ; Floppy Drive count to CX
|
|---|
| 339 | .CompareDriveNumberToDriveCount:
|
|---|
| 340 | cmp dl, cl
|
|---|
| 341 | ret
|
|---|
