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|
; $Id: bs3-mode-EnteredMode.asm $
;; @file
; BS3Kit - Bs3EnteredMode
;
;
; Copyright (C) 2007-2023 Oracle and/or its affiliates.
;
; This file is part of VirtualBox base platform packages, as
; available from https://www.virtualbox.org.
;
; This program is free software; you can redistribute it and/or
; modify it under the terms of the GNU General Public License
; as published by the Free Software Foundation, in version 3 of the
; License.
;
; This program is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
; General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, see <https://www.gnu.org/licenses>.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
; in the VirtualBox distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
;
%include "bs3kit-template-header.mac"
%if TMPL_BITS == 16
BS3_EXTERN_DATA16 g_uBs3CpuDetected
%endif
BS3_EXTERN_DATA16 g_bBs3CurrentMode
TMPL_BEGIN_TEXT
;;
; @cproto BS3_DECL(void) Bs3EnteredMode(void);
;
; @uses Nothing.
;
; @remarks ASSUMES we're in ring-0 when not in some kind of real mode.
;
BS3_PROC_BEGIN_MODE Bs3EnteredMode, BS3_PBC_NEAR ; won't need this outside the switchers, so always near.
push xBP
mov xBP, xSP
push xAX
push xCX
push xDX
TONLY16 push xBX
%if BS3_MODE_IS_64BIT_CODE(TMPL_MODE)
push r8
push r9
%endif
;
; Load stack selector (not always necessary) and sometimes CS too.
;
%if BS3_MODE_IS_RM_SYS(TMPL_MODE)
xor ax, ax
%elif BS3_MODE_IS_V86(TMPL_MODE)
extern v86_versions_of_Bs3EnteredMode_should_not_be_dragged_into_the_link
call v86_versions_of_Bs3EnteredMode_should_not_be_dragged_into_the_link
%elif BS3_MODE_IS_16BIT_CODE(TMPL_MODE)
jmp BS3_SEL_R0_CS16:.reloaded_cs
.reloaded_cs:
mov ax, BS3_SEL_R0_SS16
%elif BS3_MODE_IS_32BIT_CODE(TMPL_MODE)
mov ax, BS3_SEL_R0_SS32
%elif BS3_MODE_IS_64BIT_CODE(TMPL_MODE)
mov ax, BS3_SEL_R0_DS64
%else
%error "TMPL_MODE"
%endif
mov ss, ax
;
; Load selector appropriate for accessing BS3SYSTEM16 data.
;
%if BS3_MODE_IS_16BIT_CODE(TMPL_MODE)
mov ax, BS3_SEL_SYSTEM16
%else
mov ax, RT_CONCAT(BS3_SEL_R0_DS,TMPL_BITS)
%endif
mov ds, ax
;
; Load the appropritate IDT or IVT.
; Always 64-bit in long mode, otherwise according to TMPL_BITS.
;
%if BS3_MODE_IS_RM_SYS(TMPL_MODE)
BS3_EXTERN_SYSTEM16 Bs3Lidt_Ivt
TMPL_BEGIN_TEXT
lidt [Bs3Lidt_Ivt]
%elif BS3_MODE_IS_16BIT_SYS(TMPL_MODE)
BS3_EXTERN_SYSTEM16 Bs3Lidt_Idt16
TMPL_BEGIN_TEXT
lidt [Bs3Lidt_Idt16 TMPL_WRT_SYSTEM16_OR_FLAT]
%elif BS3_MODE_IS_32BIT_SYS(TMPL_MODE)
BS3_EXTERN_SYSTEM16 Bs3Lidt_Idt32
TMPL_BEGIN_TEXT
lidt [Bs3Lidt_Idt32 TMPL_WRT_SYSTEM16_OR_FLAT]
%elif BS3_MODE_IS_64BIT_SYS(TMPL_MODE)
BS3_EXTERN_SYSTEM16 Bs3Lidt_Idt64
TMPL_BEGIN_TEXT
lidt [Bs3Lidt_Idt64 TMPL_WRT_SYSTEM16_OR_FLAT]
%else
%error "TMPL_MODE"
%endif
%if !BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
;
; Load the appropriate task selector.
; Always 64-bit in long mode, otherwise according to TMPL_BITS.
;
%if BS3_MODE_IS_64BIT_SYS(TMPL_MODE)
BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss64
TMPL_BEGIN_TEXT
and byte [5 + Bs3Gdte_Tss64 TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
mov ax, BS3_SEL_TSS64
%elif BS3_MODE_IS_16BIT_SYS(TMPL_MODE)
BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss16
BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss16DoubleFault
TMPL_BEGIN_TEXT
and byte [5 + Bs3Gdte_Tss16 TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
and byte [5 + Bs3Gdte_Tss16DoubleFault TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
mov ax, BS3_SEL_TSS16
%elif BS3_MODE_IS_32BIT_SYS(TMPL_MODE)
BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss32
BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss32DoubleFault
BS3_EXTERN_SYSTEM16 Bs3Tss32
BS3_EXTERN_SYSTEM16 Bs3Tss32DoubleFault
TMPL_BEGIN_TEXT
and byte [5 + Bs3Gdte_Tss32 TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
and byte [5 + Bs3Gdte_Tss32DoubleFault TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
mov eax, cr3
mov [X86TSS32.cr3 + Bs3Tss32 TMPL_WRT_SYSTEM16_OR_FLAT], eax
mov [X86TSS32.cr3 + Bs3Tss32DoubleFault TMPL_WRT_SYSTEM16_OR_FLAT], eax
mov ax, BS3_SEL_TSS32
%else
%error "TMPL_BITS"
%endif
ltr ax
%endif ; !TMPL_CMN_R86
%if !BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
;
; Load the LDT.
;
mov ax, BS3_SEL_LDT
lldt ax
%endif
;
; Load ds and es; clear fs and gs.
;
%if BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
mov ax, BS3_SEL_DATA16
%else
mov ax, RT_CONCAT(BS3_SEL_R0_DS,TMPL_BITS)
%endif
mov ds, ax
mov es, ax
%if TMPL_BITS == 16
; For restoring after Bs3Trap* calls below.
push ax
push ax
cmp byte [BS3_DATA16_WRT(g_uBs3CpuDetected)], BS3CPU_80286
jbe .skip_fs_gs
%endif
xor ax, ax
mov fs, ax
mov gs, ax
.skip_fs_gs:
;
; Set global indicating CPU mode.
;
mov byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], TMPL_MODE
;
; Install system call handler.
; Always 64-bit in long mode, otherwise according to TMPL_BITS.
;
%if BS3_MODE_IS_RM_SYS(TMPL_MODE)
extern _Bs3TrapSystemCallHandler_rm
mov word [ss: BS3_TRAP_SYSCALL*4], _Bs3TrapSystemCallHandler_rm wrt CGROUP16
mov word [ss: BS3_TRAP_SYSCALL*4 + 2], CGROUP16
%elif BS3_MODE_IS_16BIT_SYS(TMPL_MODE)
BS3_EXTERN_CMN Bs3Trap16SetGate
extern TMPL_NM(Bs3TrapSystemCallHandler)
BS3_BEGIN_TEXT16
TMPL_BEGIN_TEXT
push 0 ; cParams
push TMPL_NM(Bs3TrapSystemCallHandler) wrt CGROUP16
push BS3_SEL_R0_CS16
push 3 ; DPL
push X86_SEL_TYPE_SYS_286_INT_GATE
push BS3_TRAP_SYSCALL
BS3_CALL Bs3Trap16SetGate,6
add xSP, xCB * 6
%elif BS3_MODE_IS_32BIT_SYS(TMPL_MODE)
BS3_EXTERN_CMN Bs3Trap32SetGate
extern TMPL_NM(Bs3TrapSystemCallHandler)
TMPL_BEGIN_TEXT
push 0 ; cParams
push dword TMPL_NM(Bs3TrapSystemCallHandler) wrt FLAT
push BS3_SEL_R0_CS32
push 3 ; DPL
push X86_SEL_TYPE_SYS_386_INT_GATE
push BS3_TRAP_SYSCALL
BS3_CALL Bs3Trap32SetGate,6
add xSP, xCB * 6
%elif BS3_MODE_IS_64BIT_SYS(TMPL_MODE)
BS3_EXTERN_CMN Bs3Trap64SetGate
extern _Bs3TrapSystemCallHandler_lm64
TMPL_BEGIN_TEXT
push 0 ; bIst
%if BS3_MODE_IS_64BIT_CODE(TMPL_MODE)
push _Bs3TrapSystemCallHandler_lm64 wrt FLAT
%else
push dword 0 ; upper offset
push dword _Bs3TrapSystemCallHandler_lm64 wrt FLAT
%endif
push BS3_SEL_R0_CS64
push 3 ; DPL
push AMD64_SEL_TYPE_SYS_INT_GATE
push BS3_TRAP_SYSCALL
BS3_CALL Bs3Trap64SetGate,6
add xSP, xCB * 5 + 8
%else
%error "TMPL_BITS"
%endif
%if TMPL_BITS == 16
; Restoring ds and es after the above calls.
pop es
pop ds
%endif
;
; Epilogue.
;
%if TMPL_BITS == 64
pop r9
pop r8
%endif
TONLY16 pop xBX
pop xDX
pop xCX
pop xAX
%ifdef BS3_STRICT
cmp xBP, xSP
je .return_stack_ok
int3
.return_stack_ok:
%endif
pop xBP
ret
BS3_PROC_END_MODE Bs3EnteredMode
|
