Add basic ANSI escape sequence support to BIOS console

src/arch/i386/firmware/pcbios/bios_console.c

@@ -16,8 +16,131 @@
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#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
@@ -26,10 +149,25 @@
  */
 static void bios_putchar ( int character ) {
 
+	/* Intercept ANSI escape sequences */
+	character = ansiesc_process ( &bios_ansiesc_ctx, character );
+	if ( character < 0 )
+		return;
+
+	/* Set attribute for printable characters */
+	if ( character >= 0x20 ) {
+		__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
+						   "int $0x10\n\t"
+						   "cli\n\t" )
+				       : : "a" ( 0x0920 ), "b" ( bios_attr ),
+				           "c" ( 1 ) );
+	}
+
+	/* Print the character */
 	__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
 					   "int $0x10\n\t"
 					   "cli\n\t" )
-			       : : "a" ( character | 0x0e00 ), "b" ( 1 )
+			       : : "a" ( character | 0x0e00 ), "b" ( 0 )
 			       : "ebp" );
 }
 

src/include/gpxe/ansiesc.h

@@ -93,8 +93,23 @@ struct ansiesc_context {
  * @{
  */
 
-/** Character and line position */
-#define ANSIESC_HVP 'f'
+/** Cursor position */
+#define ANSIESC_CUP 'H'
+
+/** Erase in page */
+#define ANSIESC_ED 'J'
+
+/** Erase from cursor to end of page */
+#define ANSIESC_ED_TO_END 0
+
+/** Erase from start of page to cursor */
+#define ANSIESC_ED_FROM_START 1
+
+/** Erase whole page */
+#define ANSIESC_ED_ALL 2
+
+/** Select graphic rendition */
+#define ANSIESC_SGR 'm'
 
 /** @} */