source: xtideuniversalbios/trunk/Assembly_Library/Src/Util/Bit.asm @ 592

Last change on this file since 592 was 592, checked in by krille_n_, 6 years ago

Changes:

  • The problem with NASM in the previous revision (r591) has been fixed.
  • The colors used by the boot menu and hotkey bar can now be customized by selecting one of a number of pre-defined color themes. Suggestions for additional themes are more than welcome!
  • Large builds are now 10 KB. Small builds are still 8 KB with the exception of the Tiny build which is now 4 KB. In other words, builds are now as small as possible to make it easier to combine them with other BIOSes.
  • Added code to the library to improve drive error handling. XTIDECFG can now handle "Drive Not Ready" errors.
  • Fixed a couple of potential bugs in AtaID.asm (AtaID_GetMaxPioModeToAXandMinCycleTimeToCX); 1) ATA1.bPioMode was treated as a WORD variable. 2) ATA2.bPIOSupp was assumed to be non-zero which would result in PIO mode 3 being returned if the assumption was wrong.
  • Made the same changes in the equivalent function used by BIOSDRVS (DisplayPioModeInformationUsingAtaInfoFromDSBX in AtaInfo.asm).
  • Fixed a bug from r587 in PDC20x30.asm in PDC20x30_GetMaxPioModeToALandMinPioCycleTimeToBX.
  • Fixed a bug from r523 in XTIDECFG where Auto Configure would only set the IRQ on one IDE interface on AT-builds.
  • XTIDECFG will now restore the default settings for the "Serial port virtual device" when reselecting it in the list of device types. This makes it behave consistently for all device types.
  • The eAAM macro is now used regardless if USE_UNDOC_INTEL is defined or not because it is apparently supported on all processors including the NEC V20/V30 CPUs.
  • Renamed the EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS define to EXCLUDE_FROM_XUB.
  • Added a define to exclude unused library code from BIOSDRVS (EXCLUDE_FROM_BIOSDRVS). This makes it a lot smaller than in previous revisions.
  • All unnecessary CLD-instructions are now under a new define 'CLD_NEEDED' which is only enabled for the BIOS. It is disabled for XTIDECFG and BIOSDRVS but can be enabled if needed by adding this define to the respective makefile. This change was made because these unnecessary instructions are wasteful and should never be needed. In fact, they only serve to hide bugs (in other peoples code) which I strongly believe should be avoided. I recommend people making their own BIOSes from source to not use this define as it's extremely unlikely to be needed.
  • Updated the copyright info in SerDrive and changed an URL to point to the new site.
  • Updated the copyright info and version number in BIOSDRVS.
  • Updated the copyright info in XTIDECFG.
  • Optimizations in general.
File size: 2.8 KB
Line 
1; Project name  :   Assembly Library
2; Description   :   Functions for bit handling.
3
4;
5; XTIDE Universal BIOS and Associated Tools
6; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
7;
8; This program is free software; you can redistribute it and/or modify
9; it under the terms of the GNU General Public License as published by
10; the Free Software Foundation; either version 2 of the License, or
11; (at your option) any later version.
12;
13; This program is distributed in the hope that it will be useful,
14; but WITHOUT ANY WARRANTY; without even the implied warranty of
15; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16; GNU General Public License for more details.
17; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
18;
19
20; Section containing code
21SECTION .text
22
23;--------------------------------------------------------------------
24; Bit_GetSetCountToCXfromDXAX
25;   Parameters
26;       DX:AX:  Source DWORD
27;   Returns:
28;       CX:     Number of bits set in DX:AX
29;   Corrupts registers:
30;       Nothing
31;--------------------------------------------------------------------
32ALIGN JUMP_ALIGN
33Bit_GetSetCountToCXfromDXAX:
34    push    bx
35
36    call    Bit_GetSetCountToCXfromAX
37    mov     bx, cx
38    xchg    ax, dx
39    call    Bit_GetSetCountToCXfromAX
40    xchg    ax, dx
41    add     cx, bx
42
43    pop     bx
44    ret
45
46
47;--------------------------------------------------------------------
48; Bit_GetSetCountToCXfromAX
49;   Parameters
50;       AX:     Source WORD
51;   Returns:
52;       CX:     Number of bits set in AX
53;   Corrupts registers:
54;       Nothing
55;--------------------------------------------------------------------
56ALIGN JUMP_ALIGN
57Bit_GetSetCountToCXfromAX:
58    push    ax
59
60    mov     cx, -1
61ALIGN JUMP_ALIGN
62.IncrementCX:
63    inc     cx
64.ShiftLoop:
65    shr     ax, 1
66    jc      SHORT .IncrementCX
67    jnz     SHORT .ShiftLoop
68
69    pop     ax
70    ret
71
72
73;--------------------------------------------------------------------
74; Bit_SetToDXAXfromIndexInCL
75;   Parameters:
76;       CL:     Index of bit to set (0...31)
77;       DX:AX:  Destination DWORD with flag to be set
78;   Returns:
79;       DX:AX:  DWORD with wanted bit set
80;   Corrupts registers:
81;       Nothing
82;--------------------------------------------------------------------
83ALIGN JUMP_ALIGN
84Bit_SetToDXAXfromIndexInCL:
85    cmp     cl, 16
86    jb      SHORT Bit_SetToAXfromIndexInCL
87
88    sub     cl, 16
89    xchg    ax, dx
90    call    Bit_SetToAXfromIndexInCL
91    xchg    dx, ax
92    add     cl, 16
93    ret
94
95
96;--------------------------------------------------------------------
97; Bit_SetToAXfromIndexInCL
98;   Parameters:
99;       CL:     Index of bit to set (0...15)
100;       AX:     Destination WORD with flag to be set
101;   Returns:
102;       AX:     WORD with wanted bit set
103;   Corrupts registers:
104;       Nothing
105;--------------------------------------------------------------------
106ALIGN JUMP_ALIGN
107Bit_SetToAXfromIndexInCL:
108    push    dx
109
110    mov     dx, 1
111    shl     dx, cl
112    or      ax, dx
113
114    pop     dx
115    ret
116
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