source: xtideuniversalbios/trunk/Assembly_Library/Src/Util/Registers.asm @ 106

Last change on this file since 106 was 106, checked in by aitotat, 13 years ago

Changes to Assembly Library:

  • Some utility functions are now included only when including menu dialogs.
File size: 1.7 KB
Line 
1; Project name  :   Assembly Library
2; Description   :   Functions for register operations.
3
4
5; Section containing code
6SECTION .text
7
8;--------------------------------------------------------------------
9; Registers_ExchangeDSSIwithESDI
10;   Parameters
11;       Nothing
12;   Returns:
13;       DS:SI and ES:DI are exchanged.
14;   Corrupts registers:
15;       Nothing
16;--------------------------------------------------------------------
17ALIGN JUMP_ALIGN
18Registers_ExchangeDSSIwithESDI:
19    push    ds
20    push    es
21    pop     ds
22    pop     es
23    xchg    si, di
24    ret
25
26
27;--------------------------------------------------------------------
28; Registers_CopySSBPtoESDI
29; Registers_CopySSBPtoDSSI
30; Registers_CopyDSSItoESDI
31; Registers_CopyESDItoDSSI
32;   Parameters
33;       Nothing
34;   Returns:
35;       Copies farm pointer to different segment/pointer register pair
36;   Corrupts registers:
37;       Nothing
38;--------------------------------------------------------------------
39ALIGN JUMP_ALIGN
40Registers_CopySSBPtoESDI:
41    COPY_SSBP_TO_ESDI
42    ret
43
44%ifdef INCLUDE_MENU_DIALOGS
45
46ALIGN JUMP_ALIGN
47Registers_CopySSBPtoDSSI:
48    COPY_SSBP_TO_DSSI
49    ret
50
51ALIGN JUMP_ALIGN
52Registers_CopyDSSItoESDI:
53    COPY_DSSI_TO_ESDI
54    ret
55
56ALIGN JUMP_ALIGN
57Registers_CopyESDItoDSSI:
58    COPY_ESDI_to_DSSI
59    ret
60
61%endif
62
63
64;--------------------------------------------------------------------
65; Registers_SetZFifNullPointerInDSSI (commented to save bytes)
66;   Parameters
67;       DS:SI:  Far pointer
68;   Returns:
69;       ZF:     Set if NULL pointer in DS:SI
70;   Corrupts registers:
71;       Nothing
72;--------------------------------------------------------------------
73;ALIGN JUMP_ALIGN
74;Registers_SetZFifNullPointerInDSSI:
75;   push    ax
76;   mov     ax, ds
77;   or      ax, si
78;   pop     ax
79;   ret
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