[PATCH v5 2/3] VT: Add KDFONTINFO ioctl

@@ -4851,6 +4851,30 @@ int con_font_op(struct vc_data *vc, struct console_font_op *op)
 	return -ENOSYS;
 }
 
+int con_font_info(struct vc_data *vc, struct console_font_info *info)
+{
+	int rc;
+
+	info->min_height = 0;
+	info->max_height = max_font_height;
+
+	info->min_width = 0;
+	info->max_width = max_font_width;
+
+	info->flags = KD_FONT_INFO_FLAG_LOW_SIZE | KD_FONT_INFO_FLAG_HIGH_SIZE;
+
+	console_lock();
+	if (vc->vc_mode != KD_TEXT)
+		rc = -EINVAL;
+	else if (vc->vc_sw->con_font_info)
+		rc = vc->vc_sw->con_font_info(vc, info);
+	else
+		rc = -ENOSYS;
+	console_unlock();
+
+	return rc;
+}
+
 /*
  *	Interface exported to selection and vcs.
  */

@@ -479,6 +479,19 @@ static int vt_k_ioctl(struct tty_struct *tty, unsigned int cmd,
 		break;
 	}
 
+	case KDFONTINFO: {
+		struct console_font_info fnt_info;
+
+		memset(&fnt_info, 0, sizeof(fnt_info));
+
+		ret = con_font_info(vc, &fnt_info);
+		if (ret)
+			return ret;
+		if (copy_to_user(up, &fnt_info, sizeof(fnt_info)))
+			return -EFAULT;
+		break;
+	}
+
 	default:
 		return -ENOIOCTLCMD;
 	}

@@ -21,6 +21,7 @@
 #include <linux/vesa.h>
 
 struct vc_data;
+struct console_font_info;
 struct console_font_op;
 struct console_font;
 struct module;

@@ -102,6 +103,8 @@ struct consw {
 	bool	(*con_switch)(struct vc_data *vc);
 	bool	(*con_blank)(struct vc_data *vc, enum vesa_blank_mode blank,
 			     bool mode_switch);
+	int	(*con_font_info)(struct vc_data *vc,
+				 struct console_font_info *info);
 	int	(*con_font_set)(struct vc_data *vc,
 				const struct console_font *font,
 				unsigned int vpitch, unsigned int flags);

@@ -33,6 +33,7 @@ void do_blank_screen(int entering_gfx);
 void do_unblank_screen(int leaving_gfx);
 void poke_blanked_console(void);
 int con_font_op(struct vc_data *vc, struct console_font_op *op);
+int con_font_info(struct vc_data *vc, struct console_font_info *info);
 int con_set_cmap(unsigned char __user *cmap);
 int con_get_cmap(unsigned char __user *cmap);
 void scrollback(struct vc_data *vc);

@@ -185,6 +185,20 @@ struct console_font {
 
 #define KD_FONT_FLAG_DONT_RECALC 	1	/* Don't recalculate hw charcell size [compat] */
 
+/* font information */
+
+#define KD_FONT_INFO_FLAG_LOW_SIZE	_BITUL(0) /* 256 */
+#define KD_FONT_INFO_FLAG_HIGH_SIZE	_BITUL(1) /* 512 */
+
+struct console_font_info {
+	__u32  flags;			/* KD_FONT_INFO_FLAG_* */
+	__u32 min_width, min_height;	/* minimal font size */
+	__u32 max_width, max_height;	/* maximum font size */
+	__u32 reserved[5];		/* This field is reserved for future use. Must be 0. */
+};
+
+#define KDFONTINFO	_IOR(KD_IOCTL_BASE, 0x73, struct console_font_info)
+
 /* note: 0x4B00-0x4B4E all have had a value at some time;
    don't reuse for the time being */
 /* note: 0x4B60-0x4B6D, 0x4B70-0x4B72 used above */