Changeset 625 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/RamVars.asm

Timestamp:

Feb 19, 2023, 9:26:52 PM (14 months ago)

Author:

krille_n_

Message:

Changes:

• Added a configuration option to let the BIOS store RamVars to an UMB when Full operating mode is enabled. This is primarily for XT class machines with RAM in the UMA (which apparently is a common thing these days).
• Added two new builds specifically for IBM PS/2 machines. This is for support of the new McIDE adapter from the guys at zzxio.com. Note that the additional hardware specific code (under the USE_PS2 define) is for the PS/2 machines themselves and not for the McIDE adapters, so any controller in an IBM PS/2 machine can be used with the USE_PS2 define.
• Moved pColorTheme out of the range of ROMVARS being copied over when doing "Load old settings from EEPROM" in XTIDECFG. This fixed a serious bug from r592 where loading a BIOS from file and then loading the old settings from ROM would corrupt 7 bytes of code somewhere in the loaded BIOS.
• Optimizations (speed and size) to the library. Browsing the menus in XTIDECFG should now feel a little less sluggish.
• Hopefully fixed a problem with the PostCommitHook script where it sometimes wouldn't find the CommitInProgress file. I say hopefully because testing this is a nightmare.

File:

• trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/RamVars.asm (modified) (5 diffs)

trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/RamVars.asm

@@ -4 +4 @@
 ;
 ; XTIDE Universal BIOS and Associated Tools
-; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
+; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2023 by XTIDE Universal BIOS Team.
 ;
 ; This program is free software; you can redistribute it and/or modify
@@ -36 +36 @@
     push    es
 
-%ifndef USE_AT
-    mov     ax, LITE_MODE_RAMVARS_SEGMENT
-    test    BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE
-    jz      SHORT .InitializeRamvars    ; No need to steal RAM
-%endif
+    mov     ax, [cs:ROMVARS.wRamVars]
+    test    ax, ax                      ; UMB segment or LITE_MODE_RAMVARS_SEGMENT?
+    jnz     SHORT .InitializeRamvars    ; No need to steal RAM
 
-    LOAD_BDA_SEGMENT_TO ds, ax, !       ; Zero AX
+    mov     ds, ax
     mov     al, [cs:ROMVARS.bStealSize]
     sub     [BDA.wBaseMem], ax
@@ -67 +65 @@
     ret
 
+
 ;--------------------------------------------------------------------
 ; Returns segment to RAMVARS.
-; RAMVARS might be located at the top of interrupt vectors (0030:0000h)
-; or at the top of system base RAM.
+; RAMVARS might be located at the top of interrupt vectors (0030:0000h),
+; at the top of system base RAM or in a user configured UMB.
 ;
 ; RamVars_GetSegmentToDS
@@ -82 +81 @@
 ALIGN JUMP_ALIGN
 RamVars_GetSegmentToDS:
+    mov     ds, [cs:ROMVARS.wRamVars]
+    mov     di, ds
+    test    di, di                  ; UMB segment or LITE_MODE_RAMVARS_SEGMENT?
+    jnz     SHORT .Return
 
-%ifndef USE_AT  ; Always in Full Mode for AT builds
-    test    BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE
-    jnz     SHORT .GetStolenSegmentToDS
-    %ifndef USE_186
-        mov     di, LITE_MODE_RAMVARS_SEGMENT
-        mov     ds, di
-    %else
-        push    LITE_MODE_RAMVARS_SEGMENT
-        pop     ds
-    %endif
-    ret
-%endif
-
-ALIGN JUMP_ALIGN
-.GetStolenSegmentToDS:
-    LOAD_BDA_SEGMENT_TO ds, di
 ;%ifdef USE_186
 ;   imul    di, [BDA.wBaseMem], 64  ; 2 bytes less but slower, especially on 386/486 processors
@@ -111 +98 @@
     cmp     WORD [RAMVARS.wSignature], RAMVARS_RAM_SIGNATURE
     jne     SHORT .LoopStolenKBs    ; Loop until sign found (always found eventually)
+.Return:
     ret