| 1 | ; $Id: bs3-cmn-SelFlatDataToRealMode.asm 106061 2024-09-16 14:03:52Z vboxsync $
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| 2 | ;; @file
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| 3 | ; BS3Kit - Bs3SelFlatDataToRealMode
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2007-2024 Oracle and/or its affiliates.
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| 8 | ;
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| 9 | ; This file is part of VirtualBox base platform packages, as
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| 10 | ; available from https://www.virtualbox.org.
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| 11 | ;
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| 12 | ; This program is free software; you can redistribute it and/or
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| 13 | ; modify it under the terms of the GNU General Public License
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| 14 | ; as published by the Free Software Foundation, in version 3 of the
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| 15 | ; License.
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| 16 | ;
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| 17 | ; This program is distributed in the hope that it will be useful, but
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| 18 | ; WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | ; General Public License for more details.
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| 21 | ;
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| 22 | ; You should have received a copy of the GNU General Public License
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| 23 | ; along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | ;
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| 25 | ; The contents of this file may alternatively be used under the terms
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| 26 | ; of the Common Development and Distribution License Version 1.0
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| 27 | ; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | ; in the VirtualBox distribution, in which case the provisions of the
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| 29 | ; CDDL are applicable instead of those of the GPL.
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| 30 | ;
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| 31 | ; You may elect to license modified versions of this file under the
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| 32 | ; terms and conditions of either the GPL or the CDDL or both.
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| 33 | ;
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| 34 | ; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | ;
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| 36 |
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| 37 |
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| 38 | ;*********************************************************************************************************************************
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| 39 | ;* Header Files *
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| 40 | ;*********************************************************************************************************************************
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| 41 | %include "bs3kit-template-header.mac"
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| 42 |
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| 43 |
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| 44 | ;*********************************************************************************************************************************
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| 45 | ;* External Symbols *
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| 46 | ;*********************************************************************************************************************************
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| 47 | %ifdef BS3_STRICT
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| 48 | BS3_EXTERN_CMN Bs3Panic
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| 49 | %endif
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| 50 | TMPL_BEGIN_TEXT
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| 51 | %if TMPL_BITS == 16
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| 52 | CPU 8086
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| 53 | %endif
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| 54 |
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| 55 |
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| 56 | ;;
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| 57 | ; @cproto BS3_CMN_PROTO_NOSB(uint32_t, Bs3SelFlatDataToRealMode,(uint32_t uFlatAddr));
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| 58 | ;
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| 59 | ; @uses Only return registers (ax:dx, eax, eax)
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| 60 | ; @remarks No 20h scratch area requirements.
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| 61 | ;
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| 62 | BS3_PROC_BEGIN_CMN Bs3SelFlatDataToRealMode, BS3_PBC_NEAR ; Far stub generated by the makefile/bs3kit.h.
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| 63 | push xBP
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| 64 | mov xBP, xSP
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| 65 |
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| 66 | ;
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| 67 | ; Take the simplest approach possible (64KB tiled).
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| 68 | ;
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| 69 | %if TMPL_BITS == 16
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| 70 | mov ax, cx ; save cx
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| 71 | mov dx, [xBP + xCB + cbCurRetAddr + 2]
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| 72 | %ifdef BS3_STRICT
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| 73 | cmp dx, _1M >> 16
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| 74 | jb .address_ok
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| 75 | call Bs3Panic
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| 76 | .address_ok:
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| 77 | %endif
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| 78 | mov cl, 12
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| 79 | shl dx, cl
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| 80 | mov ax, cx ; restore cx
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| 81 |
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| 82 | mov ax, [xBP + xCB + cbCurRetAddr]
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| 83 |
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| 84 | %else
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| 85 | %if TMPL_BITS == 32
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| 86 | mov eax, [xBP + xCB + cbCurRetAddr]
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| 87 | %else
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| 88 | mov rax, rcx
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| 89 | %endif
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| 90 | %ifdef BS3_STRICT
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| 91 | cmp xAX, _1M
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| 92 | jb .address_ok
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| 93 | call Bs3Panic
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| 94 | .address_ok:
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| 95 | %endif
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| 96 | ror eax, 16
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| 97 | shl ax, 12
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| 98 | rol eax, 16
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| 99 | %endif
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| 100 |
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| 101 | pop xBP
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| 102 | BS3_HYBRID_RET
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| 103 | BS3_PROC_END_CMN Bs3SelFlatDataToRealMode
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| 104 |
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