source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Boot/BootMenuEvent.asm@ 246

Last change on this file since 246 was 241, checked in by gregli@…, 13 years ago

Space optimizations in the Boot Menu and BootInfo routines, taking advantage of nested %s. Optimization in the init of RamVars to avoid writing the signature twice. Preparing for addition of serial floppy support, starting to break the assumption that our drives are always 80h or higher.
File size: 4.9 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Boot Menu event handler for menu library callbacks.
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; BootMenuEvent_Handler
9; Common parameters for all events:
10; BX: Menu event (anything from MENUEVENT struct)
11; SS:BP: Menu library handle
12; Common return values for all events:
13; CF: Set if event processed
14; Cleared if event not processed
15; Corrupts registers:
16; All
17;--------------------------------------------------------------------
18ALIGN JUMP_ALIGN
19BootMenuEvent_Handler:
20
21%ifdef MENUEVENT_INLINE_OFFSETS
22
23 add bx, BootMenuEvent_Handler
24 jmp bx
25
26MENUEVENT_InitializeMenuinitFromDSSI equ (BootMenuEvent_Handler.InitializeMenuinitFromDSSI - BootMenuEvent_Handler)
27MENUEVENT_ExitMenu equ (BootMenuEvent_EventCompleted - BootMenuEvent_Handler)
28MENUEVENT_ItemHighlightedFromCX equ (BootMenuEvent_Handler.ItemHighlightedFromCX - BootMenuEvent_Handler)
29MENUEVENT_ItemSelectedFromCX equ (BootMenuEvent_Handler.ItemSelectedFromCX - BootMenuEvent_Handler)
30MENUEVENT_KeyStrokeInAX equ (BootMenuEvent_Handler.KeyStrokeInAX - BootMenuEvent_Handler)
31MENUEVENT_RefreshTitle equ (BootMenuPrint_TitleStrings - BootMenuEvent_Handler)
32MENUEVENT_RefreshInformation equ (BootMenuPrint_RefreshInformation - BootMenuEvent_Handler)
33MENUEVENT_RefreshItemFromCX equ (BootMenuPrint_RefreshItem - BootMenuEvent_Handler)
34;
35; Note that there is no entry for MENUEVENT_IdleProcessing. If MENUEVENT_IDLEPROCESSING_ENABLE is not %defined,
36; then the entry point will not be called (saving memory on this end and at the CALL point).
37;
38
39%else
40
41 cmp bx, BYTE MENUEVENT.RefreshItemFromCX ; Above last supported item?
42 ja SHORT .EventNotHandled
43 jmp [cs:bx+.rgfnEventSpecificHandlers]
44
45.EventNotHandled:
46 clc
47 ret
48
49ALIGN WORD_ALIGN
50.rgfnEventSpecificHandlers:
51 dw .InitializeMenuinitFromDSSI ; MENUEVENT.InitializeMenuinitFromDSSI
52 dw BootMenuEvent_EventCompleted ; MENUEVENT.ExitMenu
53 dw .EventNotHandled ; MENUEVENT.IdleProcessing
54 dw .ItemHighlightedFromCX ; MENUEVENT.ItemHighlightedFromCX
55 dw .ItemSelectedFromCX ; MENUEVENT.ItemSelectedFromCX
56 dw .KeyStrokeInAX ; MENUEVENT.KeyStrokeInAX
57 dw BootMenuPrint_TitleStrings ; MENUEVENT.RefreshTitle
58 dw BootMenuPrint_RefreshInformation ; MENUEVENT.RefreshInformation
59 dw BootMenuPrint_RefreshItem ; MENUEVENT.RefreshItemFromCX
60
61%endif
62
63
64; Parameters:
65; DS:SI: Ptr to MENUINIT struct to initialize
66; Returns:
67; DS:SI: Ptr to initialized MENUINIT struct
68ALIGN JUMP_ALIGN
69.InitializeMenuinitFromDSSI:
70 push ds
71 call RamVars_GetSegmentToDS
72 call .GetDefaultMenuitemToDX
73 call BootMenu_GetMenuitemCountToAX
74 pop ds
75 mov [si+MENUINIT.wItems], ax
76 mov [si+MENUINIT.wHighlightedItem], dx
77 mov WORD [si+MENUINIT.wTitleAndInfoLines], BOOT_MENU_TITLE_AND_INFO_LINES
78 mov BYTE [si+MENUINIT.bWidth], BOOT_MENU_WIDTH
79 call BootMenu_GetHeightToAHwithItemCountInAL
80 mov [si+MENUINIT.bHeight], ah
81 mov ax, [cs:ROMVARS.wBootTimeout]
82 CALL_MENU_LIBRARY StartSelectionTimeoutWithTicksInAX
83 stc
84 ret
85
86ALIGN JUMP_ALIGN
87.GetDefaultMenuitemToDX:
88 mov dl, [cs:ROMVARS.bBootDrv] ; Default boot drive
89 call BootMenu_IsDriveInSystem
90 jnc SHORT .DoNotSetDefaultMenuitem
91 call DriveXlate_SetDriveToSwap
92 jmp BootMenu_GetMenuitemToDXforDriveInDL
93ALIGN JUMP_ALIGN
94.DoNotSetDefaultMenuitem:
95 xor dx, dx ; Whatever appears first on boot menu
96 ret
97
98
99; Parameters:
100; CX: Index of new highlighted item
101; DX: Index of previously highlighted item or NO_ITEM_HIGHLIGHTED
102ALIGN JUMP_ALIGN
103.ItemHighlightedFromCX:
104 push cx
105 call BootMenu_GetDriveToDXforMenuitemInCX_And_RamVars_GetSegmentToDS
106 call DriveXlate_Reset
107 call DriveXlate_SetDriveToSwap
108
109 xor ax, ax ; Update first floppy drive (for translated drive number)
110 CALL_MENU_LIBRARY RefreshItemFromAX
111 mov dl, 80h
112 call BootMenu_GetMenuitemToDXforDriveInDL
113 xchg ax, dx ; Update first hard disk (for translated drive number)
114 CALL_MENU_LIBRARY RefreshItemFromAX
115 pop ax ; Update new item (for translated drive number)
116 CALL_MENU_LIBRARY RefreshItemFromAX
117 CALL_MENU_LIBRARY RefreshInformation
118 stc
119 ret
120
121
122; Parameters:
123; AL: ASCII character for the key
124; AH: Keyboard library scan code for the key
125ALIGN JUMP_ALIGN
126.KeyStrokeInAX:
127 cmp ah, ROM_BOOT_HOTKEY_SCANCODE
128 jne SHORT .CheckDriveHotkeys
129 ;; NOTE: carry flag will be clear after compare above that resulted in zero
130 jmp Int19hMenu_JumpToBootSector_or_RomBoot
131ALIGN JUMP_ALIGN
132.CheckDriveHotkeys:
133 call BootMenu_GetMenuitemToAXforAsciiHotkeyInAL
134 cmp ax, [bp+MENUINIT.wItems]
135 jae SHORT BootMenuEvent_EventCompleted ; Invalid key
136 CALL_MENU_LIBRARY HighlightItemFromAX
137 ; Fall to .ItemSelectedFromCX
138
139
140; Parameters:
141; CX: Index of selected item
142ALIGN JUMP_ALIGN
143.ItemSelectedFromCX:
144 CALL_MENU_LIBRARY Close
145
146BootMenuEvent_EventCompleted:
147 stc
148 ret
149
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