diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-BiosInt15hE820.asm')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-BiosInt15hE820.asm | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-BiosInt15hE820.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-BiosInt15hE820.asm new file mode 100644 index 00000000..6b3c66e4 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-BiosInt15hE820.asm @@ -0,0 +1,245 @@ +; $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 + |