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|
; $Id: bs3-mode-BiosInt15hE820.asm $
;; @file
; BS3Kit - Bs3BiosInt15hE820
;
;
; Copyright (C) 2021-2023 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
;
;*********************************************************************************************************************************
;* Header Files *
;*********************************************************************************************************************************
%include "bs3kit-template-header.mac"
;*********************************************************************************************************************************
;* Defined Constants And Macros *
;*********************************************************************************************************************************
;; Signature: 'SMAP'
%define INT15_E820_SIGNATURE 0534d4150h
;*********************************************************************************************************************************
;* External symbols *
;*********************************************************************************************************************************
TMPL_BEGIN_TEXT
extern TMPL_NM(Bs3SwitchToRM)
BS3_BEGIN_TEXT16
extern RT_CONCAT3(_Bs3SwitchTo,TMPL_MODE_UNAME,_Safe_rm)
;;
; Performs a int 15h function 0xe820 call.
;
; @cproto BS3_MODE_PROTO_STUB(bool, Bs3BiosInt15hE820,(INT15E820ENTRY BS3_FAR *pEntry, uint32_t BS3_FAR *pcbEntry,
; uint32_t BS3_FAR *puContinuationValue));
;
; @returns Success indicator.
; @param pEntry The return buffer.
; @param pcbEntry Input: The size of the buffer (min 20 bytes);
; Output: The size of the returned data.
; @param puContinuationValue Where to get and return the continuation value (EBX)
; Set to zero the for the first call. Returned as zero
; after the last entry.
;
; @remarks ASSUMES we're in ring-0 when not in some kind of real mode.
; @remarks ASSUMES we're on a 16-bit suitable stack.
;
; @uses rax
;
TMPL_BEGIN_TEXT
BS3_PROC_BEGIN_MODE Bs3BiosInt15hE820, BS3_PBC_HYBRID
push xBP
mov xBP, xSP
sPUSHF
cli
push sBX
push sCX
push sDX
push sSI
push sDI
%ifdef TMPL_16BIT
push ds
push es
%endif
; Load/Save parameters.
%define a_pEntry [xBP + xCB + cbCurRetAddr + sCB*0]
%define a_pcbEntry [xBP + xCB + cbCurRetAddr + sCB*1]
%define a_puContinuationValue [xBP + xCB + cbCurRetAddr + sCB*2]
%ifdef TMPL_64BIT
mov a_pEntry, rcx ; save pEntry
mov a_pcbEntry, rdx ; save pcbEntry
mov a_puContinuationValue, r8 ; save a_puContinuationValue
mov ebx, [r8] ; uContinuationValue for int15
mov ecx, [rdx] ; Buffer size for int15.
%elifdef TMPL_16BIT
les bx, a_pcbEntry
mov ecx, [es:bx] ; Buffer size for int15.
les bx, a_puContinuationValue
mov ebx, [es:bx] ; Buffer size for int15.
%else
mov ecx, a_pcbEntry
mov ecx, [ecx] ; Buffer size for int15.
mov ebx, a_puContinuationValue
mov ebx, [ebx] ; uContinuationValue for int15
%endif
;
; Check that the cbEntry isn't too big or too small before doing
; the stack allocation. (Our BIOS doesn't check if too small.)
;
cmp ecx, 100h
jae .failed
cmp cl, 14h
jb .failed
%if TMPL_MODE != BS3_MODE_RM
sub xSP, xCX ; allocate a temporary buffer on the stack.
and xSP, ~0fh
%endif
;
; Switch to real mode, first we just ot the 16-bit text segment.
; This preserve all 32-bit register values.
;
%if TMPL_MODE != BS3_MODE_RM
%ifndef TMPL_16BIT
jmp .to_text16
BS3_BEGIN_TEXT16
.to_text16:
BS3_SET_BITS TMPL_BITS
%endif
call TMPL_NM(Bs3SwitchToRM)
BS3_SET_BITS 16
%endif
;
; Make the call.
;
%if TMPL_MODE == BS3_MODE_RM
les di, a_pEntry
%else
push ss ; es:di -> ss:sp
pop es
mov di, sp
%endif
mov edx, INT15_E820_SIGNATURE
mov eax, 0e820h ; BIOS function number
int 15h
;
; Switch back.
;
%if TMPL_MODE != BS3_MODE_RM
call RT_CONCAT3(_Bs3SwitchTo,TMPL_MODE_UNAME,_Safe_rm)
BS3_SET_BITS TMPL_BITS
%ifndef TMPL_16BIT
jmp .from_text16
TMPL_BEGIN_TEXT
.from_text16:
%endif
%endif
;
; Check that we didn't failed.
;
jc .failed
cmp eax, INT15_E820_SIGNATURE
jc .failed
cmp ecx, 20
jb .failed
;
; Save the continuation value.
;
%ifdef TMPL_16BIT
mov eax, ebx
lds bx, a_puContinuationValue
mov [bx], eax
%else
mov xAX, a_puContinuationValue
mov [xAX], ebx
%endif
;
; Save the entry size.
;
%ifdef TMPL_16BIT
lds bx, a_pcbEntry
%else
mov xBX, a_pcbEntry
%endif
mov [xBX], ecx
%if TMPL_MODE != BS3_MODE_RM
;
; Copy the returned stuff into the caller's buffer.
;
mov xSI, xSP
%ifdef TMPL_16BIT
push ss
pop es
lds di, a_pEntry
%else
mov xDI, a_pEntry
%endif
cld
rep movsb
%endif
;
; Return success
;
mov al, 1
.return:
%ifdef TMPL_16BIT
lea xSP, [xBP - sCB * 6 - xCB*2]
pop es
pop ds
%else
lea xSP, [xBP - sCB * 6]
%endif
pop sDI
pop sSI
pop sDX
pop sCX
pop sBX
sPOPF
leave
BS3_HYBRID_RET
;
; Failed.
;
.failed:
xor al, al
jmp .return
BS3_PROC_END_MODE Bs3BiosInt15hE820
|
