1 files changed, 298 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/arch/i386/firmware/pcbios/bios_console.c b/contrib/syslinux-4.02/gpxe/src/arch/i386/firmware/pcbios/bios_console.c
new file mode 100644
index 0000000..1d18e54
--- /dev/null
+++ b/contrib/syslinux-4.02/gpxe/src/arch/i386/firmware/pcbios/bios_console.c
@@ -0,0 +1,298 @@
+/*
+ * Copyright (C) 2006 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 <assert.h>
+#include <realmode.h>
+#include <console.h>
+#include <gpxe/ansiesc.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 bios_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 bios_handle_cup ( unsigned int count __unused, int params[] ) {
+	int cx = ( params[1] - 1 );
+	int cy = ( params[0] - 1 );
+
+	if ( cx < 0 )
+		cx = 0;
+	if ( cy < 0 )
+		cy = 0;
+
+	__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
+					   "int $0x10\n\t"
+					   "cli\n\t" )
+			       : : "a" ( 0x0200 ), "b" ( 1 ),
+			           "d" ( ( cy << 8 ) | cx ) );
+}
+
+/**
+ * Handle ANSI ED (erase in page)
+ *
+ * @v count		Parameter count
+ * @v params[0]		Region to erase
+ */
+static void bios_handle_ed ( unsigned int count __unused,
+			     int params[] __unused ) {
+	/* We assume that we always clear the whole screen */
+	assert ( params[0] == ANSIESC_ED_ALL );
+
+	__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
+					   "int $0x10\n\t"
+					   "cli\n\t" )
+			       : : "a" ( 0x0600 ), "b" ( bios_attr << 8 ),
+			           "c" ( 0 ), "d" ( 0xffff ) );
+}
+
+/**
+ * Handle ANSI SGR (set graphics rendition)
+ *
+ * @v count		Parameter count
+ * @v params		List of graphic rendition aspects
+ */
+static void bios_handle_sgr ( unsigned int count, int params[] ) {
+	static const uint8_t bios_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 bios_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 ) {
+			bios_attr = ATTR_DEFAULT;
+		} else if ( aspect == 1 ) {
+			bios_attr |= ATTR_BOLD;
+		} else if ( aspect == 22 ) {
+			bios_attr &= ~ATTR_BOLD;
+		} else if ( ( aspect >= 30 ) && ( aspect <= 39 ) ) {
+			bios_attr &= ~ATTR_FCOL_MASK;
+			bios_attr |= bios_attr_fcols[ aspect - 30 ];
+		} else if ( ( aspect >= 40 ) && ( aspect <= 49 ) ) {
+			bios_attr &= ~ATTR_BCOL_MASK;
+			bios_attr |= bios_attr_bcols[ aspect - 40 ];
+		}
+	}
+}
+
+/** BIOS console ANSI escape sequence handlers */
+static struct ansiesc_handler bios_ansiesc_handlers[] = {
+	{ ANSIESC_CUP, bios_handle_cup },
+	{ ANSIESC_ED, bios_handle_ed },
+	{ ANSIESC_SGR, bios_handle_sgr },
+	{ 0, NULL }
+};
+
+/** BIOS console ANSI escape sequence context */
+static struct ansiesc_context bios_ansiesc_ctx = {
+	.handlers = bios_ansiesc_handlers,
+};
+
+/**
+ * Print a character to BIOS console
+ *
+ * @v character		Character to be printed
+ */
+static void bios_putchar ( int character ) {
+	int discard_a, discard_b, discard_c;
+
+	/* Intercept ANSI escape sequences */
+	character = ansiesc_process ( &bios_ansiesc_ctx, character );
+	if ( character < 0 )
+		return;
+
+	/* Print character with attribute */
+	__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
+					   /* Skip non-printable characters */
+					   "cmpb $0x20, %%al\n\t"
+					   "jb 1f\n\t"
+					   /* Set attribute */
+					   "movw $0x0001, %%cx\n\t"
+					   "movb $0x09, %%ah\n\t"
+					   "int $0x10\n\t"
+					   "\n1:\n\t"
+					   /* Print character */
+					   "xorw %%bx, %%bx\n\t"
+					   "movb $0x0e, %%ah\n\t"
+					   "int $0x10\n\t"
+					   "cli\n\t" )
+			       : "=a" ( discard_a ), "=b" ( discard_b ),
+			         "=c" ( discard_c )
+			       : "a" ( character ), "b" ( bios_attr )
+			       : "ebp" );
+}
+
+/**
+ * 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 = "";
+
+/**
+ * Lowest BIOS scancode of interest
+ *
+ * Most of the BIOS key scancodes that we are interested in are in a
+ * dense range, so subtracting a constant and treating them as offsets
+ * into an array works efficiently.
+ */
+#define BIOS_KEY_MIN 0x42
+
+/** Offset into list of interesting BIOS scancodes */
+#define BIOS_KEY(scancode) ( (scancode) - BIOS_KEY_MIN )
+
+/** Mapping from BIOS scan codes to ANSI escape sequences */
+static const char *ansi_sequences[] = {
+	[ BIOS_KEY ( 0x42 ) ] = "[19~",	/* F8 (required for PXE) */
+	[ BIOS_KEY ( 0x47 ) ] = "[H",	/* Home */
+	[ BIOS_KEY ( 0x48 ) ] = "[A",	/* Up arrow */
+	[ BIOS_KEY ( 0x4b ) ] = "[D",	/* Left arrow */
+	[ BIOS_KEY ( 0x4d ) ] = "[C",	/* Right arrow */
+	[ BIOS_KEY ( 0x4f ) ] = "[F",	/* End */
+	[ BIOS_KEY ( 0x50 ) ] = "[B",	/* Down arrow */
+	[ BIOS_KEY ( 0x53 ) ] = "[3~",	/* Delete */
+};
+
+/**
+ * Get ANSI escape sequence corresponding to BIOS scancode
+ *
+ * @v scancode		BIOS scancode
+ * @ret ansi_seq	ANSI escape sequence, if any, otherwise NULL
+ */
+static const char * scancode_to_ansi_seq ( unsigned int scancode ) {
+	unsigned int bios_key = BIOS_KEY ( scancode );
+	
+	if ( bios_key < ( sizeof ( ansi_sequences ) /
+			  sizeof ( ansi_sequences[0] ) ) ) {
+		return ansi_sequences[bios_key];
+	}
+	DBG ( "Unrecognised BIOS scancode %02x\n", scancode );
+	return NULL;
+}
+
+/**
+ * Get character from BIOS console
+ *
+ * @ret character	Character read from console
+ */
+static int bios_getchar ( void ) {
+	uint16_t keypress;
+	unsigned int character;
+	const char *ansi_seq;
+
+	/* If we are mid-sequence, pass out the next byte */
+	if ( ( character = *ansi_input ) ) {
+		ansi_input++;
+		return character;
+	}
+
+	/* Read character from real BIOS console */
+	__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
+					   "int $0x16\n\t"
+					   "cli\n\t" )
+			       : "=a" ( keypress ) : "a" ( 0x1000 ) );
+	character = ( keypress & 0xff );
+
+	/* If it's a normal character, just return it */
+	if ( character && ( character < 0x80 ) )
+		return character;
+
+	/* Otherwise, check for a special key that we know about */
+	if ( ( ansi_seq = scancode_to_ansi_seq ( keypress >> 8 ) ) ) {
+		/* Start of escape sequence: return ESC (0x1b) */
+		ansi_input = ansi_seq;
+		return 0x1b;
+	}
+
+	return 0;
+}
+
+/**
+ * Check for character ready to read from BIOS console
+ *
+ * @ret True		Character available to read
+ * @ret False		No character available to read
+ */
+static int bios_iskey ( void ) {
+	unsigned int discard_a;
+	unsigned int flags;
+
+	/* If we are mid-sequence, we are always ready */
+	if ( *ansi_input )
+		return 1;
+
+	/* Otherwise check the real BIOS console */
+	__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
+					   "int $0x16\n\t"
+					   "pushfw\n\t"
+					   "popw %w0\n\t"
+					   "cli\n\t" )
+			       : "=r" ( flags ), "=a" ( discard_a )
+			       : "a" ( 0x0100 ) );
+	return ( ! ( flags & ZF ) );
+}
+
+struct console_driver bios_console __console_driver = {
+	.putchar = bios_putchar,
+	.getchar = bios_getchar,
+	.iskey = bios_iskey,
+};