| 1 | ; File name : BootMenu.asm
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| 2 | ; Project name : IDE BIOS
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| 3 | ; Created date : 25.3.2010
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| 4 | ; Last update : 1.4.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Displays Boot Menu.
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| 7 |
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| 8 | ; Section containing code
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| 9 | SECTION .text
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| 10 |
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| 11 | ;--------------------------------------------------------------------
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| 12 | ; Displays Boot Menu and returns Drive or Function number.
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| 13 | ;
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| 14 | ; BootMenu_DisplayAndReturnSelection
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| 15 | ; Parameters:
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| 16 | ; DS: RAMVARS segment
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| 17 | ; Returns:
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| 18 | ; DX: Untranslated drive number to be used for booting (if CF cleared)
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| 19 | ; Function number (if CF set)
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| 20 | ; CF: Cleared if drive selected
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| 21 | ; Set if function selected
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| 22 | ; Corrupts registers:
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| 23 | ; All General Purpose Registers
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| 24 | ;--------------------------------------------------------------------
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| 25 | ALIGN JUMP_ALIGN
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| 26 | BootMenu_DisplayAndReturnSelection:
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| 27 | call DriveXlate_Reset
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| 28 | call BootMenuPrint_TheBottomOfScreen
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| 29 | call BootMenu_GetMenuitemCount
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| 30 | mov di, BootMenuEvent_Handler
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| 31 | call BootMenu_Enter ; Get selected menuitem index to CX
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| 32 | call BootMenuPrint_ClearScreen
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| 33 | cmp cx, BYTE 0 ; -1 if nothing selected (ESC pressed)
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| 34 | jl SHORT BootMenu_DisplayAndReturnSelection
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| 35 | call BootMenu_CheckAndConvertHotkeyToMenuitem
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| 36 | jc SHORT .SetDriveTranslationForHotkey
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| 37 | jmp BootMenu_ConvertMenuitemToDriveOrFunction
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| 38 | ALIGN JUMP_ALIGN
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| 39 | .SetDriveTranslationForHotkey:
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| 40 | call BootMenu_ConvertMenuitemToDriveOrFunction
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| 41 | call DriveXlate_SetDriveToSwap
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| 42 | clc
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| 43 | ret
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| 44 |
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| 45 |
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| 46 | ;--------------------------------------------------------------------
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| 47 | ; Returns number of menuitems in Boot Menu.
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| 48 | ;
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| 49 | ; BootMenu_GetMenuitemCount
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| 50 | ; Parameters:
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| 51 | ; DS: RAMVARS segment
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| 52 | ; Returns:
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| 53 | ; CX: Number of boot menu items
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| 54 | ; Corrupts registers:
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| 55 | ; AX
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| 56 | ;--------------------------------------------------------------------
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| 57 | ALIGN JUMP_ALIGN
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| 58 | BootMenu_GetMenuitemCount:
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| 59 | call RamVars_GetDriveCounts
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| 60 | mov ax, cx
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| 61 | call FloppyDrive_GetCount
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| 62 | add ax, cx
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| 63 | call BootMenu_GetMenuFunctionCount
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| 64 | add cx, ax
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| 65 | ret
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| 66 |
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| 67 | ;--------------------------------------------------------------------
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| 68 | ; Returns number of functions displayed in Boot Menu.
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| 69 | ;
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| 70 | ; BootMenu_GetMenuFunctionCount
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| 71 | ; Parameters:
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| 72 | ; Nothing
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| 73 | ; Returns:
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| 74 | ; CX: Number of boot menu functions
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| 75 | ; Corrupts registers:
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| 76 | ; Nothing
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| 77 | ;--------------------------------------------------------------------
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| 78 | ALIGN JUMP_ALIGN
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| 79 | BootMenu_GetMenuFunctionCount:
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| 80 | xor cx, cx
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| 81 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_ROMBOOT
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| 82 | jz SHORT .DontIncludeRomBoot
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| 83 | inc cx
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| 84 | ALIGN JUMP_ALIGN
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| 85 | .DontIncludeRomBoot:
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| 86 | ret
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| 87 |
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| 88 |
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| 89 | ;--------------------------------------------------------------------
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| 90 | ; Enters Boot Menu or submenu.
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| 91 | ;
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| 92 | ; BootMenu_Enter
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| 93 | ; Parameters:
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| 94 | ; CX: Number of menuitems in menu
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| 95 | ; DS:SI: User specific far pointer
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| 96 | ; CS:DI: Pointer to menu event handler function
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| 97 | ; Returns:
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| 98 | ; CX: Index of last pointed Menuitem (not necessary selected with ENTER)
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| 99 | ; FFFFh if cancelled with ESC
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| 100 | ; Corrupts registers:
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| 101 | ; AX, BX, DX
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| 102 | ;--------------------------------------------------------------------
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| 103 | ALIGN JUMP_ALIGN
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| 104 | BootMenu_Enter:
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| 105 | call BootMenu_GetSelectionTimeout
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| 106 | call BootMenu_GetSize
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| 107 | MIN_U ah, [cs:ROMVARS.bBootMnuH] ; Limit to max height
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| 108 | jmp Menu_Enter
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| 109 |
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| 110 | ;--------------------------------------------------------------------
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| 111 | ; Returns Boot Menu selection timeout in milliseconds.
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| 112 | ;
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| 113 | ; BootMenu_GetSelectionTimeout
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| 114 | ; Parameters:
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| 115 | ; Nothing
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| 116 | ; Returns:
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| 117 | ; DX: Selection timeout in millisecs
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| 118 | ; Corrupts registers:
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| 119 | ; AX
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| 120 | ;--------------------------------------------------------------------
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| 121 | ALIGN JUMP_ALIGN
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| 122 | BootMenu_GetSelectionTimeout:
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| 123 | mov ax, 1000 ; Seconds to milliseconds
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| 124 | eMOVZX dx, BYTE [cs:ROMVARS.bBootDelay]
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| 125 | mul dx ; AX = seconds * milliseconds_per_second
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| 126 | xchg ax, dx ; DX = Timeout in millisecs
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| 127 | ret
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| 128 |
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| 129 | ;--------------------------------------------------------------------
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| 130 | ; Returns Boot Menu size.
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| 131 | ;
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| 132 | ; BootMenu_GetSize
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| 133 | ; Parameters:
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| 134 | ; Nothing
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| 135 | ; Returns:
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| 136 | ; AL: Menu width with borders included (characters)
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| 137 | ; AH: Menu height with borders included (characters)
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| 138 | ; BL: Title line count
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| 139 | ; BH: Info line count
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| 140 | ; Corrupts registers:
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| 141 | ; Nothing
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| 142 | ;--------------------------------------------------------------------
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| 143 | ALIGN JUMP_ALIGN
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| 144 | BootMenu_GetSize:
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| 145 | mov al, MENU_WIDTH_IN_CHARS
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| 146 | mov ah, cl ; Copy menuitem count to AH
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| 147 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_DRVNFO
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| 148 | jz SHORT .GetHeightWithoutInfoArea
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| 149 | ;.GetHeightWithInfoArea:
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| 150 | add ah, MENU_HEIGHT_IN_CHARS_WITH_INFO
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| 151 | mov bx, (MENU_INFO_LINE_CNT<<8) | MENU_TITLE_LINE_CNT
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| 152 | ret
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| 153 | ALIGN JUMP_ALIGN
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| 154 | .GetHeightWithoutInfoArea:
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| 155 | add ah, MENU_HEIGHT_IN_CHARS_WITHOUT_INFO
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| 156 | mov bx, MENU_TITLE_LINE_CNT
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| 157 | ret
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| 158 |
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| 159 |
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| 160 | ;--------------------------------------------------------------------
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| 161 | ; Checks if hotkey has been pressed on Boot Menu.
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| 162 | ; If it has been, it will be converted to menuitem index.
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| 163 | ;
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| 164 | ; BootMenu_CheckAndConvertHotkeyToMenuitem
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| 165 | ; Parameters:
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| 166 | ; CX: Menuitem index (if no hotkey)
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| 167 | ; Returns:
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| 168 | ; CX: Menuitem index
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| 169 | ; CF: Set if hotkey has been pressed
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| 170 | ; Cleared if no hotkey selection
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| 171 | ; Corrupts registers:
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| 172 | ; AX
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| 173 | ;--------------------------------------------------------------------
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| 174 | ALIGN JUMP_ALIGN
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| 175 | BootMenu_CheckAndConvertHotkeyToMenuitem:
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| 176 | push es
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| 177 | LOAD_BDA_SEGMENT_TO es, ax ; Zero AX
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| 178 | xchg al, [es:BOOTVARS.bMenuHotkey] ; Load and clear hotkey
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| 179 | test al, al ; No hotkey? (clears CF)
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| 180 | jz SHORT .Return
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| 181 | call BootMenu_ConvertHotkeyToMenuitem
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| 182 | stc
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| 183 | ALIGN JUMP_ALIGN
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| 184 | .Return:
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| 185 | pop es
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| 186 | ret
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| 187 |
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| 188 | ;--------------------------------------------------------------------
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| 189 | ; Converts any hotkey to Boot Menu menuitem index.
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| 190 | ;
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| 191 | ; BootMenu_ConvertHotkeyToMenuitem
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| 192 | ; Parameters:
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| 193 | ; AX: ASCII hotkey starting from upper case 'A'
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| 194 | ; Returns:
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| 195 | ; CX: Menuitem index
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| 196 | ; Corrupts registers:
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| 197 | ; AX
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| 198 | ;--------------------------------------------------------------------
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| 199 | ALIGN JUMP_ALIGN
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| 200 | BootMenu_ConvertHotkeyToMenuitem:
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| 201 | call BootMenu_GetLetterForFirstHardDisk
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| 202 | cmp al, cl ; Letter is for Hard Disk?
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| 203 | jae SHORT .StartFromHardDiskLetter
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| 204 | sub al, 'A' ; Letter to Floppy Drive menuitem
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| 205 | xchg ax, cx ; Menuitem index to CX
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| 206 | ret
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| 207 | ALIGN JUMP_ALIGN
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| 208 | .StartFromHardDiskLetter:
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| 209 | sub al, cl ; Hard Disk index
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| 210 | call FloppyDrive_GetCount
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| 211 | add cx, ax ; Menuitem index
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| 212 | ret
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| 213 |
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| 214 | ;--------------------------------------------------------------------
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| 215 | ; Returns letter for first hard disk. Usually it will be 'c' but it
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| 216 | ; can be higher if more than two floppy drives are found.
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| 217 | ;
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| 218 | ; BootMenu_GetLetterForFirstHardDisk
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| 219 | ; Parameters:
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| 220 | ; Nothing
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| 221 | ; Returns:
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| 222 | ; CL: Upper case letter for first hard disk
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| 223 | ; Corrupts registers:
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| 224 | ; CH
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| 225 | ;--------------------------------------------------------------------
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| 226 | ALIGN JUMP_ALIGN
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| 227 | BootMenu_GetLetterForFirstHardDisk:
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| 228 | call FloppyDrive_GetCount
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| 229 | add cl, 'A'
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| 230 | MAX_U cl, 'C'
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| 231 | ret
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| 232 |
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| 233 |
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| 234 | ;--------------------------------------------------------------------
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| 235 | ; Converts selected menuitem index to drive number or function ID.
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| 236 | ;
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| 237 | ; BootMenu_ConvertMenuitemToDriveOrFunction
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| 238 | ; Parameters:
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| 239 | ; CX: Index of menuitem selected from Boot Menu
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| 240 | ; DS: RAMVARS segment
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| 241 | ; Returns:
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| 242 | ; DX: Drive number to be used for booting (if CF cleared)
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| 243 | ; Function ID (if CF set)
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| 244 | ; CF: Cleared if drive selected
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| 245 | ; Set if function selected
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| 246 | ; Corrupts registers:
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| 247 | ; AX, CX
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| 248 | ;--------------------------------------------------------------------
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| 249 | ALIGN JUMP_ALIGN
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| 250 | BootMenu_ConvertMenuitemToDriveOrFunction:
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| 251 | mov dx, cx ; Copy menuitem index to DX
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| 252 | call FloppyDrive_GetCount
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| 253 | cmp dx, cx ; Floppy drive?
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| 254 | jb SHORT .ReturnFloppyDriveInDX
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| 255 | sub dx, cx ; Remove floppy drives from index
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| 256 | call RamVars_GetDriveCounts
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| 257 | cmp dx, cx ; Hard disk?
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| 258 | jb SHORT .ReturnHardDiskInDX
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| 259 | sub dx, cx ; Remove hard disks from index
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| 260 | jmp SHORT BootMenu_ConvertFunctionIndexToID
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| 261 | ALIGN JUMP_ALIGN
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| 262 | .ReturnHardDiskInDX:
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| 263 | or dl, 80h
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| 264 | ALIGN JUMP_ALIGN
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| 265 | .ReturnFloppyDriveInDX:
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| 266 | clc
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| 267 | ret
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| 268 |
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| 269 |
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| 270 | ;--------------------------------------------------------------------
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| 271 | ; Converts selected menuitem index to drive number or function ID.
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| 272 | ;
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| 273 | ; BootMenu_ConvertFunctionIndexToID
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| 274 | ; Parameters:
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| 275 | ; CX: Menuitem index
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| 276 | ; DX: Function index (Menuitem index - floppy count - HD count)
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| 277 | ; Returns:
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| 278 | ; DX: Function ID
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| 279 | ; CF: Set to indicate function
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| 280 | ; Corrupts registers:
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| 281 | ; AX, CX
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| 282 | ;--------------------------------------------------------------------
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| 283 | ALIGN JUMP_ALIGN
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| 284 | BootMenu_ConvertFunctionIndexToID:
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| 285 | mov dx, ID_BOOTFUNC_ROMBOOT
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| 286 | stc
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| 287 | ret
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| 288 |
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| 289 |
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| 290 | ;--------------------------------------------------------------------
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| 291 | ; Converts Floppy or Hard Disk Drive number to menuitem index.
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| 292 | ; This function does not check does the drive really exists.
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| 293 | ;
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| 294 | ; BootMenu_ConvertDriveToMenuitem
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| 295 | ; Parameters:
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| 296 | ; DL: Drive number
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| 297 | ; Returns:
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| 298 | ; CX: Menuitem index (assuming drive is available)
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| 299 | ; Corrupts registers:
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| 300 | ; AX
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| 301 | ;--------------------------------------------------------------------
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| 302 | ALIGN JUMP_ALIGN
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| 303 | BootMenu_ConvertDriveToMenuitem:
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| 304 | test dl, 80h ; Floppy drive?
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| 305 | jz SHORT .ReturnFloppyMenuitem
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| 306 | call FloppyDrive_GetCount
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| 307 | mov ax, 7Fh ; Load mask to clear floppy bit
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| 308 | and ax, dx ; AX = Hard Disk index
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| 309 | add cx, ax ; Add hard disk index to floppy drive count
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| 310 | ret
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| 311 | ALIGN JUMP_ALIGN
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| 312 | .ReturnFloppyMenuitem:
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| 313 | eMOVZX cx, dl ; Drive number and item index are equal
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| 314 | ret
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| 315 |
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| 316 |
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| 317 | ;--------------------------------------------------------------------
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| 318 | ; Checks is drive number valid for this system.
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| 319 | ;
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| 320 | ; BootMenu_IsDriveInSystem
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| 321 | ; Parameters:
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| 322 | ; DL: Drive number
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| 323 | ; DS: RAMVARS segment
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| 324 | ; Returns:
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| 325 | ; SF: Set if drive number is valid
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| 326 | ; Clear if drive is not present in system
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| 327 | ; Corrupts registers:
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| 328 | ; AX
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| 329 | ;--------------------------------------------------------------------
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| 330 | ALIGN JUMP_ALIGN
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| 331 | BootMenu_IsDriveInSystem:
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| 332 | test dl, 80h ; Floppy drive?
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| 333 | jz SHORT .IsFloppyDriveIsInSystem
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| 334 | call RamVars_GetDriveCounts
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| 335 | mov ax, 7Fh ; Load mask to clear floppy bit
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| 336 | and ax, dx ; AX = Hard Disk index
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| 337 | cmp ax, cx ; Valid drive index?
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| 338 | ret
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| 339 | ALIGN JUMP_ALIGN
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| 340 | .IsFloppyDriveIsInSystem:
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| 341 | call FloppyDrive_GetCount
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| 342 | cmp dl, cl
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| 343 | ret
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