VirtualBox

source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-SelFlatDataToProtFar16.asm@ 83878

Last change on this file since 83878 was 82968, checked in by vboxsync, 5 years ago

Copyright year updates by scm.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 4.3 KB
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1; $Id: bs3-cmn-SelFlatDataToProtFar16.asm 82968 2020-02-04 10:35:17Z vboxsync $
2;; @file
3; BS3Kit - Bs3SelFlatDataToProtFar16.
4;
5
6;
7; Copyright (C) 2007-2020 Oracle Corporation
8;
9; This file is part of VirtualBox Open Source Edition (OSE), as
10; available from http://www.virtualbox.org. This file is free software;
11; you can redistribute it and/or modify it under the terms of the GNU
12; General Public License (GPL) as published by the Free Software
13; Foundation, in version 2 as it comes in the "COPYING" file of the
14; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16;
17; The contents of this file may alternatively be used under the terms
18; of the Common Development and Distribution License Version 1.0
19; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20; VirtualBox OSE distribution, in which case the provisions of the
21; CDDL are applicable instead of those of the GPL.
22;
23; You may elect to license modified versions of this file under the
24; terms and conditions of either the GPL or the CDDL or both.
25;
26
27
28;*********************************************************************************************************************************
29;* Header Files *
30;*********************************************************************************************************************************
31%include "bs3kit-template-header.mac"
32
33
34;*********************************************************************************************************************************
35;* External Symbols *
36;*********************************************************************************************************************************
37%ifdef BS3_STRICT
38BS3_EXTERN_CMN Bs3Panic
39%endif
40
41TMPL_BEGIN_TEXT
42%if TMPL_BITS == 16
43CPU 8086
44%endif
45
46
47;;
48; @cproto BS3_CMN_PROTO_NOSB(uint32_t, Bs3SelFlatDataToProtFar16,(uint32_t uFlatAddr));
49;
50; @uses Only return registers (ax:dx, eax, eax)
51; @remarks No 20h scratch area requirements.
52;
53BS3_PROC_BEGIN_CMN Bs3SelFlatDataToProtFar16, BS3_PBC_NEAR ; Far stub generated by the makefile/bs3kit.h.
54 push xBP
55 mov xBP, xSP
56
57 ;
58 ; Check if we can use the protected mode stack or data selector.
59 ; The latter ensures the usability of this function for setting SS.
60 ;
61%if TMPL_BITS == 16
62 mov ax, [xBP + xCB + cbCurRetAddr]
63 mov dx, [xBP + xCB + cbCurRetAddr + 2]
64 test dx, dx
65 jnz .not_stack
66 mov dx, BS3_SEL_R0_SS16
67%else
68TNOT64 mov eax, [xBP + xCB + cbCurRetAddr]
69TONLY64 mov eax, ecx
70 test eax, 0ffff0000h
71 jnz .not_stack
72 or eax, BS3_SEL_R0_SS16 << 16
73%endif
74 jmp .return
75
76.not_stack:
77%if TMPL_BITS == 16
78 sub ax, BS3_ADDR_BS3DATA16 & 0xffff
79 sbb dx, BS3_ADDR_BS3DATA16 >> 16
80 jnz .do_tiled
81 mov dx, BS3_SEL_R0_DS16
82%else
83 sub eax, BS3_ADDR_BS3DATA16
84 test eax, 0ffff0000h
85 jnz .do_tiled
86 or eax, BS3_SEL_R0_DS16 << 16
87%endif
88 jmp .return
89
90 ;
91 ; Just translate the address to tiled.
92 ;
93.do_tiled:
94%if TMPL_BITS == 16
95 ; Convert upper 16-bit to a tiled selector.
96 mov ax, cx ; save cx
97 mov dx, [xBP + xCB + cbCurRetAddr + 2]
98 %ifdef BS3_STRICT
99 cmp dx, BS3_SEL_TILED_AREA_SIZE >> 16
100 jb .address_ok
101 call Bs3Panic
102.address_ok:
103 %endif
104 mov cl, X86_SEL_SHIFT
105 shl dx, cl
106 add dx, BS3_SEL_TILED
107 mov cx, ax ; restore cx
108
109 ; Load segment offset and return.
110 mov ax, [xBP + xCB + cbCurRetAddr]
111
112%else
113 ; Convert upper 16-bit to tiled selector.
114TNOT64 mov eax, [xBP + xCB + cbCurRetAddr]
115TONLY64 mov rax, rcx
116 %ifdef BS3_STRICT
117 cmp xAX, BS3_SEL_TILED_AREA_SIZE
118 jb .address_ok
119 call Bs3Panic
120.address_ok:
121 %endif
122 ror eax, 16
123 shl ax, X86_SEL_SHIFT
124 add ax, BS3_SEL_TILED
125 rol eax, 16
126%endif
127
128.return:
129 pop xBP
130 BS3_HYBRID_RET
131BS3_PROC_END_CMN Bs3SelFlatDataToProtFar16
132
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