wimboot/wimboot-2.7.3/src/stdio.c

   1 /*
   2  * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301, USA.
  18  */
  19
  20 /**
  21  * @file
  22  *
  23  * Standard Input/Output
  24  *
  25  */
  26
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include "bootapp.h"
  30 #include "wimboot.h"
  31 #include "efi.h"
  32
  33 /**
  34  * Print character to console
  35  *
  36  * @v character         Character to print
  37  */
  38 int putchar ( int character ) {
  39         EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *conout;
  40         struct bootapp_callback_params params;
  41         wchar_t wbuf[2];
  42
  43         /* Convert LF to CR,LF */
  44         if ( character == '\n' )
  45                 putchar ( '\r' );
  46
  47         /* Print character to bochs debug port */
  48         __asm__ __volatile__ ( "outb %b0, $0xe9"
  49                                : : "a" ( character ) );
  50
  51         /* Print character to EFI/BIOS console as applicable */
  52         if ( efi_systab ) {
  53                 conout = efi_systab->ConOut;
  54                 wbuf[0] = character;
  55                 wbuf[1] = 0;
  56                 conout->OutputString ( conout, wbuf );
  57         } else {
  58                 memset ( &params, 0, sizeof ( params ) );
  59                 params.vector.interrupt = 0x10;
  60                 params.eax = ( 0x0e00 | character );
  61                 params.ebx = 0x0007;
  62                 call_interrupt ( &params );
  63         }
  64
  65         return 0;
  66 }
  67
  68 /**
  69  * Get character from console
  70  *
  71  * @ret character       Character
  72  */
  73 int getchar ( void ) {
  74         EFI_BOOT_SERVICES *bs;
  75         EFI_SIMPLE_TEXT_INPUT_PROTOCOL *conin;
  76         EFI_INPUT_KEY key;
  77         UINTN index;
  78         struct bootapp_callback_params params;
  79         int character;
  80
  81         /* Get character */
  82         if ( efi_systab ) {
  83                 bs = efi_systab->BootServices;
  84                 conin = efi_systab->ConIn;
  85                 bs->WaitForEvent ( 1, &conin->WaitForKey, &index );
  86                 conin->ReadKeyStroke ( conin, &key );
  87                 character = key.UnicodeChar;
  88         } else {
  89                 memset ( &params, 0, sizeof ( params ) );
  90                 params.vector.interrupt = 0x16;
  91                 call_interrupt ( &params );
  92                 character = params.al;
  93         }
  94
  95         return character;
  96 }