| 1 | ; $Id: bs3-cmn-RegSetLdtr.asm 76553 2019-01-01 01:45:53Z vboxsync $
|
|---|
| 2 | ;; @file
|
|---|
| 3 | ; BS3Kit - Bs3RegSetLdtr
|
|---|
| 4 | ;
|
|---|
| 5 |
|
|---|
| 6 | ;
|
|---|
| 7 | ; Copyright (C) 2007-2019 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 | %include "bs3kit-template-header.mac"
|
|---|
| 28 |
|
|---|
| 29 |
|
|---|
| 30 | BS3_EXTERN_CMN Bs3Syscall
|
|---|
| 31 | %if TMPL_BITS == 16
|
|---|
| 32 | BS3_EXTERN_DATA16 g_bBs3CurrentMode
|
|---|
| 33 | %endif
|
|---|
| 34 | BS3_EXTERN_SYSTEM16 Bs3Gdt
|
|---|
| 35 | TMPL_BEGIN_TEXT
|
|---|
| 36 |
|
|---|
| 37 |
|
|---|
| 38 | ;;
|
|---|
| 39 | ; @cproto BS3_CMN_PROTO_STUB(void, Bs3RegSetLdtr,(uint16_t uValue));
|
|---|
| 40 | ;
|
|---|
| 41 | ; @param uValue The value to set.
|
|---|
| 42 |
|
|---|
| 43 | ; @remarks Does not require 20h of parameter scratch space in 64-bit mode.
|
|---|
| 44 | ;
|
|---|
| 45 | ; @uses No GPRs.
|
|---|
| 46 | ;
|
|---|
| 47 | BS3_PROC_BEGIN_CMN Bs3RegSetLdtr, BS3_PBC_HYBRID_SAFE
|
|---|
| 48 | BS3_CALL_CONV_PROLOG 1
|
|---|
| 49 | push xBP
|
|---|
| 50 | mov xBP, xSP
|
|---|
| 51 | push xDX
|
|---|
| 52 | push xAX
|
|---|
| 53 |
|
|---|
| 54 | mov dx, [xBP + xCB + cbCurRetAddr]
|
|---|
| 55 |
|
|---|
| 56 | %if TMPL_BITS == 16
|
|---|
| 57 | ; If V8086 mode we have to go thru a syscall.
|
|---|
| 58 | test byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], BS3_MODE_CODE_V86
|
|---|
| 59 | jnz .via_system_call
|
|---|
| 60 | %endif
|
|---|
| 61 | ; If not in ring-0, we have to make a system call.
|
|---|
| 62 | mov ax, ss
|
|---|
| 63 | and ax, X86_SEL_RPL
|
|---|
| 64 | jnz .via_system_call
|
|---|
| 65 |
|
|---|
| 66 | ; Load it.
|
|---|
| 67 | lldt dx
|
|---|
| 68 | jmp .return
|
|---|
| 69 |
|
|---|
| 70 | .via_system_call:
|
|---|
| 71 | mov ax, BS3_SYSCALL_SET_LDTR
|
|---|
| 72 | call Bs3Syscall
|
|---|
| 73 |
|
|---|
| 74 | .return:
|
|---|
| 75 | pop xAX
|
|---|
| 76 | pop xDX
|
|---|
| 77 | pop xBP
|
|---|
| 78 | BS3_CALL_CONV_EPILOG 1
|
|---|
| 79 | BS3_HYBRID_RET
|
|---|
| 80 | BS3_PROC_END_CMN Bs3RegSetLdtr
|
|---|
| 81 |
|
|---|
