diff options
Diffstat (limited to 'contrib/syslinux-4.02/gpxe/src/interface/efi/efi_console.c')
| -rw-r--r-- | contrib/syslinux-4.02/gpxe/src/interface/efi/efi_console.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/interface/efi/efi_console.c b/contrib/syslinux-4.02/gpxe/src/interface/efi/efi_console.c new file mode 100644 index 0000000..04af28a --- /dev/null +++ b/contrib/syslinux-4.02/gpxe/src/interface/efi/efi_console.c @@ -0,0 +1,276 @@ +/* + * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>. + * + * 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; either version 2 of the + * License, or any later version. + * + * 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, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +#include <stddef.h> +#include <assert.h> +#include <gpxe/efi/efi.h> +#include <gpxe/ansiesc.h> +#include <console.h> + +#define ATTR_BOLD 0x08 + +#define ATTR_FCOL_MASK 0x07 +#define ATTR_FCOL_BLACK 0x00 +#define ATTR_FCOL_BLUE 0x01 +#define ATTR_FCOL_GREEN 0x02 +#define ATTR_FCOL_CYAN 0x03 +#define ATTR_FCOL_RED 0x04 +#define ATTR_FCOL_MAGENTA 0x05 +#define ATTR_FCOL_YELLOW 0x06 +#define ATTR_FCOL_WHITE 0x07 + +#define ATTR_BCOL_MASK 0x70 +#define ATTR_BCOL_BLACK 0x00 +#define ATTR_BCOL_BLUE 0x10 +#define ATTR_BCOL_GREEN 0x20 +#define ATTR_BCOL_CYAN 0x30 +#define ATTR_BCOL_RED 0x40 +#define ATTR_BCOL_MAGENTA 0x50 +#define ATTR_BCOL_YELLOW 0x60 +#define ATTR_BCOL_WHITE 0x70 + +#define ATTR_DEFAULT ATTR_FCOL_WHITE + +/** Current character attribute */ +static unsigned int efi_attr = ATTR_DEFAULT; + +/** + * Handle ANSI CUP (cursor position) + * + * @v count Parameter count + * @v params[0] Row (1 is top) + * @v params[1] Column (1 is left) + */ +static void efi_handle_cup ( unsigned int count __unused, int params[] ) { + EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *conout = efi_systab->ConOut; + int cx = ( params[1] - 1 ); + int cy = ( params[0] - 1 ); + + if ( cx < 0 ) + cx = 0; + if ( cy < 0 ) + cy = 0; + + conout->SetCursorPosition ( conout, cx, cy ); +} + +/** + * Handle ANSI ED (erase in page) + * + * @v count Parameter count + * @v params[0] Region to erase + */ +static void efi_handle_ed ( unsigned int count __unused, + int params[] __unused ) { + EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *conout = efi_systab->ConOut; + + /* We assume that we always clear the whole screen */ + assert ( params[0] == ANSIESC_ED_ALL ); + + conout->ClearScreen ( conout ); +} + +/** + * Handle ANSI SGR (set graphics rendition) + * + * @v count Parameter count + * @v params List of graphic rendition aspects + */ +static void efi_handle_sgr ( unsigned int count, int params[] ) { + EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *conout = efi_systab->ConOut; + static const uint8_t efi_attr_fcols[10] = { + ATTR_FCOL_BLACK, ATTR_FCOL_RED, ATTR_FCOL_GREEN, + ATTR_FCOL_YELLOW, ATTR_FCOL_BLUE, ATTR_FCOL_MAGENTA, + ATTR_FCOL_CYAN, ATTR_FCOL_WHITE, + ATTR_FCOL_WHITE, ATTR_FCOL_WHITE /* defaults */ + }; + static const uint8_t efi_attr_bcols[10] = { + ATTR_BCOL_BLACK, ATTR_BCOL_RED, ATTR_BCOL_GREEN, + ATTR_BCOL_YELLOW, ATTR_BCOL_BLUE, ATTR_BCOL_MAGENTA, + ATTR_BCOL_CYAN, ATTR_BCOL_WHITE, + ATTR_BCOL_BLACK, ATTR_BCOL_BLACK /* defaults */ + }; + unsigned int i; + int aspect; + + for ( i = 0 ; i < count ; i++ ) { + aspect = params[i]; + if ( aspect == 0 ) { + efi_attr = ATTR_DEFAULT; + } else if ( aspect == 1 ) { + efi_attr |= ATTR_BOLD; + } else if ( aspect == 22 ) { + efi_attr &= ~ATTR_BOLD; + } else if ( ( aspect >= 30 ) && ( aspect <= 39 ) ) { + efi_attr &= ~ATTR_FCOL_MASK; + efi_attr |= efi_attr_fcols[ aspect - 30 ]; + } else if ( ( aspect >= 40 ) && ( aspect <= 49 ) ) { + efi_attr &= ~ATTR_BCOL_MASK; + efi_attr |= efi_attr_bcols[ aspect - 40 ]; + } + } + + conout->SetAttribute ( conout, efi_attr ); +} + +/** EFI console ANSI escape sequence handlers */ +static struct ansiesc_handler efi_ansiesc_handlers[] = { + { ANSIESC_CUP, efi_handle_cup }, + { ANSIESC_ED, efi_handle_ed }, + { ANSIESC_SGR, efi_handle_sgr }, + { 0, NULL } +}; + +/** EFI console ANSI escape sequence context */ +static struct ansiesc_context efi_ansiesc_ctx = { + .handlers = efi_ansiesc_handlers, +}; + +/** + * Print a character to EFI console + * + * @v character Character to be printed + */ +static void efi_putchar ( int character ) { + EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *conout = efi_systab->ConOut; + wchar_t wstr[] = { character, 0 }; + + /* Intercept ANSI escape sequences */ + character = ansiesc_process ( &efi_ansiesc_ctx, character ); + if ( character < 0 ) + return; + + conout->OutputString ( conout, wstr ); +} + +/** + * Pointer to current ANSI output sequence + * + * While we are in the middle of returning an ANSI sequence for a + * special key, this will point to the next character to return. When + * not in the middle of such a sequence, this will point to a NUL + * (note: not "will be NULL"). + */ +static const char *ansi_input = ""; + +/** Mapping from EFI scan codes to ANSI escape sequences */ +static const char *ansi_sequences[] = { + [SCAN_UP] = "[A", + [SCAN_DOWN] = "[B", + [SCAN_RIGHT] = "[C", + [SCAN_LEFT] = "[D", + [SCAN_HOME] = "[H", + [SCAN_END] = "[F", + [SCAN_INSERT] = "[2~", + /* EFI translates an incoming backspace via the serial console + * into a SCAN_DELETE. There's not much we can do about this. + */ + [SCAN_DELETE] = "[3~", + [SCAN_PAGE_UP] = "[5~", + [SCAN_PAGE_DOWN] = "[6~", + /* EFI translates some (but not all) incoming escape sequences + * via the serial console into equivalent scancodes. When it + * doesn't recognise a sequence, it helpfully(!) translates + * the initial ESC and passes the remainder through verbatim. + * Treating SCAN_ESC as equivalent to an empty escape sequence + * works around this bug. + */ + [SCAN_ESC] = "", +}; + +/** + * Get ANSI escape sequence corresponding to EFI scancode + * + * @v scancode EFI scancode + * @ret ansi_seq ANSI escape sequence, if any, otherwise NULL + */ +static const char * scancode_to_ansi_seq ( unsigned int scancode ) { + if ( scancode < ( sizeof ( ansi_sequences ) / + sizeof ( ansi_sequences[0] ) ) ) { + return ansi_sequences[scancode]; + } + return NULL; +} + +/** + * Get character from EFI console + * + * @ret character Character read from console + */ +static int efi_getchar ( void ) { + EFI_SIMPLE_TEXT_INPUT_PROTOCOL *conin = efi_systab->ConIn; + const char *ansi_seq; + EFI_INPUT_KEY key; + EFI_STATUS efirc; + + /* If we are mid-sequence, pass out the next byte */ + if ( *ansi_input ) + return *(ansi_input++); + + /* Read key from real EFI console */ + if ( ( efirc = conin->ReadKeyStroke ( conin, &key ) ) != 0 ) { + DBG ( "EFI could not read keystroke: %s\n", + efi_strerror ( efirc ) ); + return 0; + } + DBG2 ( "EFI read key stroke with unicode %04x scancode %04x\n", + key.UnicodeChar, key.ScanCode ); + + /* If key has a Unicode representation, return it */ + if ( key.UnicodeChar ) + return key.UnicodeChar; + + /* Otherwise, check for a special key that we know about */ + if ( ( ansi_seq = scancode_to_ansi_seq ( key.ScanCode ) ) ) { + /* Start of escape sequence: return ESC (0x1b) */ + ansi_input = ansi_seq; + return 0x1b; + } + + return 0; +} + +/** + * Check for character ready to read from EFI console + * + * @ret True Character available to read + * @ret False No character available to read + */ +static int efi_iskey ( void ) { + EFI_BOOT_SERVICES *bs = efi_systab->BootServices; + EFI_SIMPLE_TEXT_INPUT_PROTOCOL *conin = efi_systab->ConIn; + EFI_STATUS efirc; + + /* If we are mid-sequence, we are always ready */ + if ( *ansi_input ) + return 1; + + /* Check to see if the WaitForKey event has fired */ + if ( ( efirc = bs->CheckEvent ( conin->WaitForKey ) ) == 0 ) + return 1; + + return 0; +} + +struct console_driver efi_console __console_driver = { + .putchar = efi_putchar, + .getchar = efi_getchar, + .iskey = efi_iskey, +}; |