| 1 | /* $Id: print.c 96407 2022-08-22 17:43:14Z vboxsync $ */
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| 2 | /** @file
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| 3 | * PC BIOS - ???
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2022 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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| 26 | * --------------------------------------------------------------------
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| 27 | *
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| 28 | * This code is based on:
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| 29 | *
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| 30 | * ROM BIOS for use with Bochs/Plex86/QEMU emulation environment
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| 31 | *
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| 32 | * Copyright (C) 2002 MandrakeSoft S.A.
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| 33 | *
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| 34 | * MandrakeSoft S.A.
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| 35 | * 43, rue d'Aboukir
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| 36 | * 75002 Paris - France
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| 37 | * http://www.linux-mandrake.com/
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| 38 | * http://www.mandrakesoft.com/
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| 39 | *
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| 40 | * This library is free software; you can redistribute it and/or
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| 41 | * modify it under the terms of the GNU Lesser General Public
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| 42 | * License as published by the Free Software Foundation; either
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| 43 | * version 2 of the License, or (at your option) any later version.
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| 44 | *
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| 45 | * This library is distributed in the hope that it will be useful,
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| 46 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 47 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 48 | * Lesser General Public License for more details.
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| 49 | *
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| 50 | * You should have received a copy of the GNU Lesser General Public
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| 51 | * License along with this library; if not, write to the Free Software
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| 52 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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| 53 | *
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| 54 | */
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| 55 |
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| 56 | /*
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| 57 | * Oracle LGPL Disclaimer: For the avoidance of doubt, except that if any license choice
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| 58 | * other than GPL or LGPL is available it will apply instead, Oracle elects to use only
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| 59 | * the Lesser General Public License version 2.1 (LGPLv2) at this time for any software where
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| 60 | * a choice of LGPL license versions is made available with the language indicating
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| 61 | * that LGPLv2 or any later version may be used, or where a choice of which version
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| 62 | * of the LGPL is applied is otherwise unspecified.
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| 63 | */
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| 64 |
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| 65 |
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| 66 | #include <stdint.h>
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| 67 | #include <stdarg.h>
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| 68 | #include "inlines.h"
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| 69 | #include "biosint.h"
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| 70 |
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| 71 | // Debug printf support
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| 72 |
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| 73 | /* Redirect INFO output to backdoor logging port. */
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| 74 | #define INFO_PORT 0x504
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| 75 | #define DEBUG_PORT 0x403
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| 76 |
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| 77 | const char bios_prefix_string[] = "BIOS: ";
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| 78 |
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| 79 | void wrch(uint8_t c);
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| 80 | #pragma aux wrch = "mov ah, 0eh" "int 10h" parm [al] modify exact [ax bx];
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| 81 |
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| 82 | void send(uint16_t action, uint8_t c)
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| 83 | {
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| 84 | #if BX_DEBUG_SERIAL
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| 85 | if (c == '\n')
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| 86 | uart_tx_byte(BX_DEBUG_PORT, '\r');
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| 87 | uart_tx_byte(BX_DEBUG_PORT, c);
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| 88 | #endif
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| 89 | #if BX_VIRTUAL_PORTS
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| 90 | if (action & BIOS_PRINTF_DEBUG)
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| 91 | outb(DEBUG_PORT, c);
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| 92 | if (action & BIOS_PRINTF_INFO)
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| 93 | outb(INFO_PORT, c);
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| 94 | #endif
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| 95 | if (action & BIOS_PRINTF_SCREEN) {
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| 96 | if (c == '\n')
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| 97 | wrch('\r');
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| 98 | wrch(c);
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| 99 | }
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| 100 | }
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| 101 |
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| 102 | void put_int(uint16_t action, short val, short width, bx_bool neg)
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| 103 | {
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| 104 | short nval = val / 10;
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| 105 | if (nval)
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| 106 | put_int(action, nval, width - 1, neg);
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| 107 | else {
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| 108 | while (--width > 0)
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| 109 | send(action, ' ');
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| 110 | if (neg)
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| 111 | send(action, '-');
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| 112 | }
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| 113 | send(action, val - (nval * 10) + '0');
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| 114 | }
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| 115 |
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| 116 | void put_uint(uint16_t action, unsigned short val, short width, bx_bool neg)
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| 117 | {
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| 118 | unsigned short nval = val / 10;
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| 119 | if (nval)
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| 120 | put_uint(action, nval, width - 1, neg);
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| 121 | else {
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| 122 | while (--width > 0)
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| 123 | send(action, ' ');
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| 124 | if (neg)
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| 125 | send(action, '-');
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| 126 | }
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| 127 | send(action, val - (nval * 10) + '0');
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| 128 | }
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| 129 |
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| 130 | void put_luint(uint16_t action, unsigned long val, short width, bx_bool neg)
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| 131 | {
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| 132 | unsigned long nval = val / 10;
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| 133 | if (nval)
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| 134 | put_luint(action, nval, width - 1, neg);
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| 135 | else {
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| 136 | while (--width > 0)
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| 137 | send(action, ' ');
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| 138 | if (neg)
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| 139 | send(action, '-');
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| 140 | }
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| 141 | send(action, val - (nval * 10) + '0');
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| 142 | }
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| 143 |
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| 144 | void put_str(uint16_t action, const char __far *s)
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| 145 | {
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| 146 | uint8_t c;
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| 147 |
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| 148 | while (c = *s) {
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| 149 | send(action, c);
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| 150 | s++;
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| 151 | }
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| 152 | }
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| 153 |
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| 154 | void put_str_near(uint16_t action, const char __near *s)
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| 155 | {
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| 156 | uint8_t c;
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| 157 |
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| 158 | while (c = *s) {
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| 159 | send(action, c);
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| 160 | s++;
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| 161 | }
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| 162 | }
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| 163 |
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| 164 |
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| 165 | //--------------------------------------------------------------------------
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| 166 | // bios_printf()
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| 167 | // A compact variable argument printf function.
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| 168 | //
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| 169 | // Supports %[format_width][length]format
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| 170 | // where format can be x,X,u,d,s,S,c
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| 171 | // and the optional length modifier is l (ell, long 32-bit) or ll
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| 172 | // (long long, 64-bit).
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| 173 | // Only x,X work with ll
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| 174 | //--------------------------------------------------------------------------
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| 175 | void bios_printf(uint16_t action, const char *s, ...)
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| 176 | {
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| 177 | uint8_t c;
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| 178 | bx_bool in_format;
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| 179 | int i;
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| 180 | uint16_t arg, nibble, hibyte, format_width, hexadd;
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| 181 | va_list args;
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| 182 |
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| 183 | va_start( args, s );
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| 184 |
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| 185 | in_format = 0;
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| 186 | format_width = 0;
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| 187 |
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| 188 | if ((action & BIOS_PRINTF_DEBHALT) == BIOS_PRINTF_DEBHALT) {
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| 189 | bios_printf (BIOS_PRINTF_SCREEN, "FATAL: ");
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| 190 | }
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| 191 |
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| 192 | while (c = *s) {
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| 193 | if ( c == '%' ) {
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| 194 | in_format = 1;
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| 195 | format_width = 0;
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| 196 | }
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| 197 | else if (in_format) {
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| 198 | if ( (c>='0') && (c<='9') ) {
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| 199 | format_width = (format_width * 10) + (c - '0');
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| 200 | }
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| 201 | else {
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| 202 | arg = va_arg( args, uint16_t );
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| 203 | if (c == 'x' || c == 'X') {
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| 204 | if (format_width == 0)
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| 205 | format_width = 4;
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| 206 | if (c == 'x')
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| 207 | hexadd = 'a';
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| 208 | else
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| 209 | hexadd = 'A';
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| 210 | for (i=format_width-1; i>=0; i--) {
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| 211 | nibble = (arg >> (4 * i)) & 0x000f;
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| 212 | send (action, (nibble<=9)? (nibble+'0') : (nibble-10+hexadd));
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| 213 | }
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| 214 | }
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| 215 | else if (c == 'u') {
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| 216 | put_uint(action, arg, format_width, 0);
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| 217 | }
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| 218 | else if (c == 'l' && s[1] == 'l') {
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| 219 | uint64_t llval;
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| 220 | uint16_t __far *cp16;
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| 221 |
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| 222 | s += 2;
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| 223 | c = *s;
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| 224 | cp16 = (uint16_t __far *)&llval;
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| 225 | cp16[0] = arg;
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| 226 | cp16[1] = va_arg( args, uint16_t );
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| 227 | cp16[2] = va_arg( args, uint16_t );
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| 228 | cp16[3] = va_arg( args, uint16_t );
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| 229 | if (c == 'x' || c == 'X') {
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| 230 | if (format_width == 0)
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| 231 | format_width = 16;
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| 232 | if (c == 'x')
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| 233 | hexadd = 'a';
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| 234 | else
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| 235 | hexadd = 'A';
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| 236 | for (i=format_width-1; i>=0; i--) {
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| 237 | nibble = (llval >> (i * 4)) & 0x000f;
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| 238 | send (action, (nibble<=9)? (nibble+'0') : (nibble-10+hexadd));
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| 239 | }
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| 240 | } else {
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| 241 | BX_PANIC("bios_printf: unknown %ll format\n");
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| 242 | }
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| 243 | }
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| 244 | else if (c == 'l') {
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| 245 | s++;
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| 246 | c = *s; /* is it ld,lx,lu? */
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| 247 | hibyte = va_arg( args, uint16_t );
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| 248 | if (c == 'd') {
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| 249 | if (hibyte & 0x8000)
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| 250 | put_luint(action, 0L-(((uint32_t) hibyte << 16) | arg), format_width-1, 1);
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| 251 | else
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| 252 | put_luint(action, ((uint32_t) hibyte << 16) | arg, format_width, 0);
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| 253 | }
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| 254 | else if (c == 'u') {
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| 255 | put_luint(action, ((uint32_t) hibyte << 16) | arg, format_width, 0);
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| 256 | }
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| 257 | else if (c == 'x' || c == 'X')
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| 258 | {
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| 259 | if (format_width == 0)
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| 260 | format_width = 8;
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| 261 | if (c == 'x')
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| 262 | hexadd = 'a';
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| 263 | else
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| 264 | hexadd = 'A';
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| 265 | for (i=format_width-1; i>=0; i--) {
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| 266 | nibble = ((((uint32_t)hibyte << 16) | arg) >> (4 * i)) & 0x000f;
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| 267 | send (action, (nibble<=9)? (nibble+'0') : (nibble-10+hexadd));
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| 268 | }
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| 269 | }
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| 270 | }
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| 271 | else if (c == 'd') {
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| 272 | if (arg & 0x8000)
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| 273 | put_int(action, -arg, format_width - 1, 1);
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| 274 | else
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| 275 | put_int(action, arg, format_width, 0);
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| 276 | }
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| 277 | else if (c == 's') {
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| 278 | put_str(action, (char *)arg);
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| 279 | }
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| 280 | else if (c == 'S') {
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| 281 | hibyte = arg;
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| 282 | arg = va_arg( args, uint16_t );
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| 283 | put_str(action, hibyte :> (char *)arg);
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| 284 | }
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| 285 | else if (c == 'c') {
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| 286 | send(action, arg);
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| 287 | }
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| 288 | else
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| 289 | BX_PANIC("bios_printf: unknown format\n");
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| 290 | in_format = 0;
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| 291 | }
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| 292 | }
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| 293 | else {
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| 294 | send(action, c);
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| 295 | }
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| 296 | ++s;
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| 297 | }
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| 298 | va_end( args );
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| 299 | if (action & BIOS_PRINTF_HALT) {
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| 300 | // freeze in a busy loop.
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| 301 | int_disable();
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| 302 | halt_forever();
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| 303 | }
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| 304 | }
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| 305 |
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| 306 | // End of printf support
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