Changeset 229 in xtideuniversalbios

Timestamp:

Jan 29, 2012, 5:46:59 PM (12 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• All builds now initialize drives on boot loader (INT 19h).

Location:

trunk/XTIDE_Universal_BIOS/Src

Files:

• Handlers/Int13h/EBIOS/AH48h_GetExtendedDriveParameters.asm (modified) (1 diff)
• Handlers/Int19hLate.asm (deleted)
• Initialization/Initialize.asm (modified) (3 diffs)
• Main.asm (modified) (1 diff)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/EBIOS/AH48h_GetExtendedDriveParameters.asm

@@ -66 +66 @@
     mov     [si+EDRIVE_INFO.qwTotalSectors+2], dx
     mov     [si+EDRIVE_INFO.qwTotalSectors+4], bx
-    mov     [si+EDRIVE_INFO.qwTotalSectors+6], ax
+    mov     [si+EDRIVE_INFO.qwTotalSectors+6], ax   ; Always zero
     mov     WORD [si+EDRIVE_INFO.wSectorSize], 512
 

trunk/XTIDE_Universal_BIOS/Src/Initialization/Initialize.asm

@@ -17 +17 @@
 ;       Nothing
 ;--------------------------------------------------------------------
-Initialize_FromMainBiosRomSearch:             ; unused entrypoint ok
+Initialize_FromMainBiosRomSearch:           ; unused entrypoint ok
     pushf
     push    es
@@ -24 +24 @@
 
     LOAD_BDA_SEGMENT_TO es, ax
-    call    Initialize_ShouldSkip
+    sti                                     ; Enable interrupts
+    test    BYTE [es:BDA.bKBFlgs1], (1<<2)  ; Clears ZF if CTRL is held down
     jnz     SHORT .SkipRomInitialization
 
-%ifdef USE_AT   ; Early initialization on AT build
-    call    Initialize_AndDetectDrives
-%else           ; Late initialization on XT builds
-    call    Int19hLate_InitializeInt19h
-%endif
+    ; Install INT 19h handler (boot loader) where drives are detected
+    mov     bx, BIOS_BOOT_LOADER_INTERRUPT_19h
+    mov     si, HandlerForLateInitialization
+    call    Interrupts_InstallHandlerToVectorInBXFromCSSI
+
 .SkipRomInitialization:
     ePOPA
@@ -41 +42 @@
 
 ;--------------------------------------------------------------------
-; Checks if user wants to skip ROM initialization.
-;
-; Initialize_ShouldSkip
+; HandlerForLateInitialization
 ;   Parameters:
-;       ES:     BDA segment
+;       Nothing
 ;   Returns:
-;       ZF:     Cleared if ROM initialization is to be skipped
-;               Set to continue ROM initialization
-;   Corrupts registers:
-;       Nothing
+;       Never returns
 ;--------------------------------------------------------------------
-Initialize_ShouldSkip:
-    sti                                     ; Enable interrupts
-    test    BYTE [es:BDA.bKBFlgs1], (1<<2)  ; Clear ZF if CTRL is held down
-    ret
+HandlerForLateInitialization:
+    LOAD_BDA_SEGMENT_TO es, ax
+    call    Initialize_AndDetectDrives      ; Installs new boot menu loader
+    int     BIOS_BOOT_LOADER_INTERRUPT_19h  ; Display boot menu
 
 

trunk/XTIDE_Universal_BIOS/Src/Main.asm

@@ -182 +182 @@
 
     ; Boot loader
-%ifndef USE_AT
-    %include "Int19hLate.asm"       ; For late initialization
-%endif
     %include "Int19hMenu.asm"       ; For Int 19h, Boot Loader for Boot Menu