1c0ff6e1a7
Signed-off-by: Michael Brown <mcb30@ipxe.org>
277 lines
7.5 KiB
C
277 lines
7.5 KiB
C
/*
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* Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <stddef.h>
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#include <assert.h>
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#include <ipxe/efi/efi.h>
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#include <ipxe/ansiesc.h>
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#include <ipxe/console.h>
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#define ATTR_BOLD 0x08
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#define ATTR_FCOL_MASK 0x07
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#define ATTR_FCOL_BLACK 0x00
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#define ATTR_FCOL_BLUE 0x01
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#define ATTR_FCOL_GREEN 0x02
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#define ATTR_FCOL_CYAN 0x03
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#define ATTR_FCOL_RED 0x04
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#define ATTR_FCOL_MAGENTA 0x05
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#define ATTR_FCOL_YELLOW 0x06
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#define ATTR_FCOL_WHITE 0x07
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#define ATTR_BCOL_MASK 0x70
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#define ATTR_BCOL_BLACK 0x00
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#define ATTR_BCOL_BLUE 0x10
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#define ATTR_BCOL_GREEN 0x20
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#define ATTR_BCOL_CYAN 0x30
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#define ATTR_BCOL_RED 0x40
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#define ATTR_BCOL_MAGENTA 0x50
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#define ATTR_BCOL_YELLOW 0x60
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#define ATTR_BCOL_WHITE 0x70
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#define ATTR_DEFAULT ATTR_FCOL_WHITE
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/** Current character attribute */
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static unsigned int efi_attr = ATTR_DEFAULT;
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/**
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* Handle ANSI CUP (cursor position)
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*
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* @v count Parameter count
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* @v params[0] Row (1 is top)
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* @v params[1] Column (1 is left)
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*/
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static void efi_handle_cup ( unsigned int count __unused, int params[] ) {
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EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *conout = efi_systab->ConOut;
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int cx = ( params[1] - 1 );
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int cy = ( params[0] - 1 );
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if ( cx < 0 )
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cx = 0;
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if ( cy < 0 )
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cy = 0;
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conout->SetCursorPosition ( conout, cx, cy );
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}
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/**
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* Handle ANSI ED (erase in page)
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*
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* @v count Parameter count
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* @v params[0] Region to erase
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*/
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static void efi_handle_ed ( unsigned int count __unused,
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int params[] __unused ) {
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EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *conout = efi_systab->ConOut;
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/* We assume that we always clear the whole screen */
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assert ( params[0] == ANSIESC_ED_ALL );
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conout->ClearScreen ( conout );
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}
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/**
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* Handle ANSI SGR (set graphics rendition)
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*
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* @v count Parameter count
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* @v params List of graphic rendition aspects
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*/
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static void efi_handle_sgr ( unsigned int count, int params[] ) {
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EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *conout = efi_systab->ConOut;
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static const uint8_t efi_attr_fcols[10] = {
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ATTR_FCOL_BLACK, ATTR_FCOL_RED, ATTR_FCOL_GREEN,
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ATTR_FCOL_YELLOW, ATTR_FCOL_BLUE, ATTR_FCOL_MAGENTA,
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ATTR_FCOL_CYAN, ATTR_FCOL_WHITE,
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ATTR_FCOL_WHITE, ATTR_FCOL_WHITE /* defaults */
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};
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static const uint8_t efi_attr_bcols[10] = {
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ATTR_BCOL_BLACK, ATTR_BCOL_RED, ATTR_BCOL_GREEN,
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ATTR_BCOL_YELLOW, ATTR_BCOL_BLUE, ATTR_BCOL_MAGENTA,
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ATTR_BCOL_CYAN, ATTR_BCOL_WHITE,
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ATTR_BCOL_BLACK, ATTR_BCOL_BLACK /* defaults */
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};
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unsigned int i;
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int aspect;
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for ( i = 0 ; i < count ; i++ ) {
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aspect = params[i];
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if ( aspect == 0 ) {
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efi_attr = ATTR_DEFAULT;
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} else if ( aspect == 1 ) {
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efi_attr |= ATTR_BOLD;
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} else if ( aspect == 22 ) {
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efi_attr &= ~ATTR_BOLD;
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} else if ( ( aspect >= 30 ) && ( aspect <= 39 ) ) {
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efi_attr &= ~ATTR_FCOL_MASK;
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efi_attr |= efi_attr_fcols[ aspect - 30 ];
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} else if ( ( aspect >= 40 ) && ( aspect <= 49 ) ) {
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efi_attr &= ~ATTR_BCOL_MASK;
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efi_attr |= efi_attr_bcols[ aspect - 40 ];
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}
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}
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conout->SetAttribute ( conout, efi_attr );
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}
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/** EFI console ANSI escape sequence handlers */
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static struct ansiesc_handler efi_ansiesc_handlers[] = {
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{ ANSIESC_CUP, efi_handle_cup },
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{ ANSIESC_ED, efi_handle_ed },
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{ ANSIESC_SGR, efi_handle_sgr },
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{ 0, NULL }
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};
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/** EFI console ANSI escape sequence context */
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static struct ansiesc_context efi_ansiesc_ctx = {
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.handlers = efi_ansiesc_handlers,
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};
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/**
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* Print a character to EFI console
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*
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* @v character Character to be printed
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*/
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static void efi_putchar ( int character ) {
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EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *conout = efi_systab->ConOut;
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wchar_t wstr[] = { character, 0 };
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/* Intercept ANSI escape sequences */
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character = ansiesc_process ( &efi_ansiesc_ctx, character );
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if ( character < 0 )
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return;
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conout->OutputString ( conout, wstr );
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}
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/**
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* Pointer to current ANSI output sequence
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*
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* While we are in the middle of returning an ANSI sequence for a
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* special key, this will point to the next character to return. When
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* not in the middle of such a sequence, this will point to a NUL
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* (note: not "will be NULL").
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*/
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static const char *ansi_input = "";
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/** Mapping from EFI scan codes to ANSI escape sequences */
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static const char *ansi_sequences[] = {
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[SCAN_UP] = "[A",
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[SCAN_DOWN] = "[B",
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[SCAN_RIGHT] = "[C",
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[SCAN_LEFT] = "[D",
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[SCAN_HOME] = "[H",
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[SCAN_END] = "[F",
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[SCAN_INSERT] = "[2~",
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/* EFI translates an incoming backspace via the serial console
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* into a SCAN_DELETE. There's not much we can do about this.
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*/
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[SCAN_DELETE] = "[3~",
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[SCAN_PAGE_UP] = "[5~",
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[SCAN_PAGE_DOWN] = "[6~",
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/* EFI translates some (but not all) incoming escape sequences
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* via the serial console into equivalent scancodes. When it
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* doesn't recognise a sequence, it helpfully(!) translates
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* the initial ESC and passes the remainder through verbatim.
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* Treating SCAN_ESC as equivalent to an empty escape sequence
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* works around this bug.
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*/
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[SCAN_ESC] = "",
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};
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/**
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* Get ANSI escape sequence corresponding to EFI scancode
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*
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* @v scancode EFI scancode
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* @ret ansi_seq ANSI escape sequence, if any, otherwise NULL
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*/
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static const char * scancode_to_ansi_seq ( unsigned int scancode ) {
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if ( scancode < ( sizeof ( ansi_sequences ) /
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sizeof ( ansi_sequences[0] ) ) ) {
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return ansi_sequences[scancode];
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}
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return NULL;
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}
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/**
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* Get character from EFI console
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*
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* @ret character Character read from console
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*/
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static int efi_getchar ( void ) {
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EFI_SIMPLE_TEXT_INPUT_PROTOCOL *conin = efi_systab->ConIn;
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const char *ansi_seq;
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EFI_INPUT_KEY key;
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EFI_STATUS efirc;
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/* If we are mid-sequence, pass out the next byte */
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if ( *ansi_input )
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return *(ansi_input++);
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/* Read key from real EFI console */
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if ( ( efirc = conin->ReadKeyStroke ( conin, &key ) ) != 0 ) {
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DBG ( "EFI could not read keystroke: %s\n",
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efi_strerror ( efirc ) );
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return 0;
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}
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DBG2 ( "EFI read key stroke with unicode %04x scancode %04x\n",
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key.UnicodeChar, key.ScanCode );
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/* If key has a Unicode representation, return it */
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if ( key.UnicodeChar )
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return key.UnicodeChar;
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/* Otherwise, check for a special key that we know about */
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if ( ( ansi_seq = scancode_to_ansi_seq ( key.ScanCode ) ) ) {
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/* Start of escape sequence: return ESC (0x1b) */
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ansi_input = ansi_seq;
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return 0x1b;
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}
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return 0;
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}
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/**
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* Check for character ready to read from EFI console
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*
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* @ret True Character available to read
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* @ret False No character available to read
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*/
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static int efi_iskey ( void ) {
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EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
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EFI_SIMPLE_TEXT_INPUT_PROTOCOL *conin = efi_systab->ConIn;
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EFI_STATUS efirc;
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/* If we are mid-sequence, we are always ready */
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if ( *ansi_input )
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return 1;
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/* Check to see if the WaitForKey event has fired */
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if ( ( efirc = bs->CheckEvent ( conin->WaitForKey ) ) == 0 )
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return 1;
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return 0;
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}
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struct console_driver efi_console __console_driver = {
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.putchar = efi_putchar,
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.getchar = efi_getchar,
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.iskey = efi_iskey,
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};
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