| 1 | ; $Id: bs3-mode-PagingGetRootForLM64.asm 82968 2020-02-04 10:35:17Z vboxsync $
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| 2 | ;; @file
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| 3 | ; BS3Kit - Bs3PagingGetRootForLM64
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2007-2020 Oracle Corporation
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| 8 | ;
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| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | ; available from http://www.virtualbox.org. This file is free software;
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| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
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| 12 | ; General Public License (GPL) as published by the Free Software
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| 13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | ;
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| 17 | ; The contents of this file may alternatively be used under the terms
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| 18 | ; of the Common Development and Distribution License Version 1.0
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| 19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | ; VirtualBox OSE distribution, in which case the provisions of the
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| 21 | ; CDDL are applicable instead of those of the GPL.
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| 22 | ;
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| 23 | ; You may elect to license modified versions of this file under the
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| 24 | ; terms and conditions of either the GPL or the CDDL or both.
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| 25 | ;
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| 26 |
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| 27 | %include "bs3kit-template-header.mac"
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| 28 |
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| 29 |
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| 30 | %ifdef TMPL_RM
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| 31 | extern TMPL_NM(Bs3SwitchToPE16)
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| 32 | extern NAME(Bs3SwitchToRM_pe16)
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| 33 | %elifdef TMPL_CMN_V86
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| 34 | extern TMPL_NM(Bs3SwitchToRing0)
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| 35 | extern TMPL_NM(Bs3SwitchTo16BitV86)
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| 36 | %endif
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| 37 |
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| 38 | BS3_EXTERN_CMN Bs3PagingInitRootForLM
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| 39 |
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| 40 | BS3_EXTERN_DATA16 g_PhysPagingRootLM
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| 41 | TMPL_BEGIN_TEXT
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| 42 |
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| 43 |
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| 44 | ;;
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| 45 | ; @cproto BS3_DECL(uint32_t) Bs3PagingGetRootForLM64(void)
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| 46 | ;
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| 47 | ; @returns eax
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| 48 | ;
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| 49 | ; @uses ax
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| 50 | ;
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| 51 | ; @remarks returns value in EAX, not dx:ax!
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| 52 | ;
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| 53 | BS3_PROC_BEGIN_MODE Bs3PagingGetRootForLM64, BS3_PBC_NEAR ; Internal function, no far variant necessary.
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| 54 | mov eax, [BS3_DATA16_WRT(g_PhysPagingRootLM)]
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| 55 | cmp eax, 0ffffffffh
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| 56 | je .init_root
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| 57 | %ifdef BS3_STRICT
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| 58 | .return:
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| 59 | cmp eax, 1000h
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| 60 | jnb .cr3_ok_low
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| 61 | hlt
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| 62 | .cr3_ok_low:
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| 63 | cmp eax, 16*_1M
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| 64 | jb .cr3_ok_high
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| 65 | hlt
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| 66 | .cr3_ok_high:
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| 67 | %endif
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| 68 | ret
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| 69 |
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| 70 | .init_root:
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| 71 | push xBP
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| 72 | mov xBP, xSP
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| 73 | BONLY16 push es
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| 74 | push sDX
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| 75 | push sCX
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| 76 | push sBX
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| 77 | %if TMPL_BITS == 64
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| 78 | push r8
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| 79 | push r9
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| 80 | push r10
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| 81 | push r11
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| 82 | %endif
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| 83 |
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| 84 | %ifdef TMPL_RM
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| 85 | ;
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| 86 | ; We don't want to be restricted to real mode addressing, so
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| 87 | ; temporarily switch to 16-bit protected mode.
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| 88 | ;
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| 89 | call TMPL_NM(Bs3SwitchToPE16)
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| 90 | call Bs3PagingInitRootForLM
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| 91 | call NAME(Bs3SwitchToRM_pe16)
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| 92 | %elifdef TMPL_CMN_V86
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| 93 | ;
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| 94 | ; V8086 mode uses real mode addressing too. Unlikly that we'll
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| 95 | ; ever end up here though.
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| 96 | ;
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| 97 | call TMPL_NM(Bs3SwitchToRing0)
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| 98 | call Bs3PagingInitRootForLM
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| 99 | call TMPL_NM(Bs3SwitchTo16BitV86)
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| 100 | %else
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| 101 | ;
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| 102 | ; Not a problematic addressing mode.
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| 103 | ;
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| 104 | BONLY64 sub rsp, 20h
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| 105 | BS3_CALL Bs3PagingInitRootForLM, 0
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| 106 | BONLY64 add rsp, 20h
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| 107 | %endif
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| 108 |
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| 109 | ;
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| 110 | ; Load the value and return.
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| 111 | ;
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| 112 | mov eax, [BS3_DATA16_WRT(g_PhysPagingRootLM)]
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| 113 |
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| 114 | %if TMPL_BITS == 64
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| 115 | pop r11
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| 116 | pop r10
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| 117 | pop r9
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| 118 | pop r8
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| 119 | %endif
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| 120 | pop sBX
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| 121 | pop sCX
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| 122 | pop sDX
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| 123 | BONLY16 pop es
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| 124 | leave
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| 125 | %ifdef BS3_STRICT
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| 126 | jmp .return
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| 127 | %else
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| 128 | ret
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| 129 | %endif
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| 130 | BS3_PROC_END_MODE Bs3PagingGetRootForLM64
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| 131 |
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