diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PrintStrN.asm')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PrintStrN.asm | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PrintStrN.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PrintStrN.asm new file mode 100644 index 00000000..4a0fe223 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PrintStrN.asm @@ -0,0 +1,204 @@ +; $Id: bs3-cmn-PrintStrN.asm $ +;; @file +; BS3Kit - Bs3PrintStrN. +; + +; +; 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 +; + + +;********************************************************************************************************************************* +;* Header Files * +;********************************************************************************************************************************* +%include "bs3kit-template-header.mac" + + +;********************************************************************************************************************************* +;* External Symbols * +;********************************************************************************************************************************* +%if TMPL_BITS == 16 +BS3_EXTERN_DATA16 g_bBs3CurrentMode +%endif +BS3_EXTERN_CMN Bs3Syscall + + +TMPL_BEGIN_TEXT + +;; +; @cproto BS3_DECL(void) Bs3PrintStrN_c16(const char BS3_FAR *pszString, size_t cchString); +; +; ASSUMES cchString < 64KB! +; +BS3_PROC_BEGIN_CMN Bs3PrintStrN, BS3_PBC_NEAR + BS3_CALL_CONV_PROLOG 2 + push xBP + mov xBP, xSP + push xAX + push xCX + push xBX + push xSI + +%if TMPL_BITS == 16 + ; If we're in real mode or v8086 mode, call the VGA BIOS directly. + mov bl, [g_bBs3CurrentMode] + cmp bl, BS3_MODE_RM + je .do_bios_call + %if 0 + test bl, BS3_MODE_CODE_V86 + jz .do_system_call + %else + jmp .do_system_call + %endif + + ; + ; We can do the work right here. + ; +.do_bios_call: + push ds + lds si, [xBP + xCB + cbCurRetAddr] ; DS:SI -> string. + cld + mov cx, [xBP + xCB + cbCurRetAddr + sCB] ; Use CX for counting down. + call Bs3PrintStrN_c16_CX_Bytes_At_DS_SI + pop ds + jmp .return +%endif + + + ; + ; Need to do system call(s). + ; String goes into CX:xSI, count into DX. + ; + ; We must ensure the string is real-mode addressable first, if not we + ; must do it char-by-char. + ; +.do_system_call: +%if TMPL_BITS == 16 + mov cx, [xBP + xCB + cbCurRetAddr + 2] +%else + mov cx, ds +%endif + mov xSI, [xBP + xCB + cbCurRetAddr] + mov dx, [xBP + xCB + cbCurRetAddr + sCB] +%if TMPL_BITS == 16 + +%else + cmp xSI, _1M + jae .char_by_char +%endif + mov ax, BS3_SYSCALL_PRINT_STR + call Bs3Syscall ; near! no BS3_CALL! + +.return: + pop xSI + pop xBX + pop xCX + pop xAX + pop xBP + BS3_CALL_CONV_EPILOG 2 + BS3_HYBRID_RET + + ; + ; Doesn't look like it's real-mode addressable. So, char-by-char. + ; +.char_by_char: +%if TMPL_BITS == 16 + push es + mov es, cx +%endif + cld + test dx, dx + jz .char_by_char_return +.char_by_char_loop: + mov ax, BS3_SYSCALL_PRINT_CHR + mov cl, [BS3_ONLY_16BIT(es:) xSI] + call Bs3Syscall ; near! no BS3_CALL! + inc xSI + dec xDX + jnz .char_by_char_loop +.char_by_char_return: +%if TMPL_BITS == 16 + pop es +%endif + jmp .return + +BS3_PROC_END_CMN Bs3PrintStrN + + +%if TMPL_BITS == 16 +; +; This code is shared with the system handler. +; +; @param CX Number of byte sto print. +; @param DS:SI The string to print +; @uses AX, BX, CX, SI +; +BS3_PROC_BEGIN Bs3PrintStrN_c16_CX_Bytes_At_DS_SI + CPU 8086 + ; Check if CX is zero first. + test cx, cx + jz .bios_loop_done + + ; The loop, processing the string char-by-char. +.bios_loop: + mov bx, 0ff00h + lodsb ; al = next char + cmp al, 0ah ; \n + je .bios_loop_newline +%ifdef BS3_STRICT + test al, al + jnz .not_zero + hlt +.not_zero: +%endif + mov ah, 0eh +.bios_loop_int10h: + int 10h + loop .bios_loop +.bios_loop_done: + ret + +.bios_loop_newline: + mov ax, 0e0dh ; cmd + '\r'. + int 10h + mov ax, 0e0ah ; cmd + '\n'. + mov bx, 0ff00h + jmp .bios_loop_int10h +BS3_PROC_END Bs3PrintStrN_c16_CX_Bytes_At_DS_SI + + +; +; Generate 16-bit far stub. +; Peformance critical, so don't penalize near calls. +; +BS3_CMN_FAR_STUB Bs3PrintStrN, 6 + +%endif + |