Merge tag 'gpio-v4.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux...

[deliverable/linux.git] / include / linux / console_struct.h

diff --git a/include/linux/console_struct.h b/include/linux/console_struct.h
index e329ee2667e1954298cf6c152ba37833d1cc2e0d..6fd3c908a340d234aee8ec8c8a99e0612f9c8a91 100644 (file)
--- a/include/linux/console_struct.h
+++ b/include/linux/console_struct.h
@@ -21,6 +21,38 @@ struct uni_pagedir;
 
 #define NPAR 16
 
+/*
+ * Example: vc_data of a console that was scrolled 3 lines down.
+ *
+ *                              Console buffer
+ * vc_screenbuf ---------> +----------------------+-.
+ *                         | initializing W       |  \
+ *                         | initializing X       |   |
+ *                         | initializing Y       |    > scroll-back area
+ *                         | initializing Z       |   |
+ *                         |                      |  /
+ * vc_visible_origin ---> ^+----------------------+-:
+ * (changes by scroll)    || Welcome to linux     |  \
+ *                        ||                      |   |
+ *           vc_rows --->< | login: root          |   |  visible on console
+ *                        || password:            |    > (vc_screenbuf_size is
+ * vc_origin -----------> ||                      |   |   vc_size_row * vc_rows)
+ * (start when no scroll) || Last login: 12:28    |  /
+ *                        v+----------------------+-:
+ *                         | Have a lot of fun... |  \
+ * vc_pos -----------------|--------v             |   > scroll-front area
+ *                         | ~ # cat_             |  /
+ * vc_scr_end -----------> +----------------------+-:
+ * (vc_origin +            |                      |  \ EMPTY, to be filled by
+ *  vc_screenbuf_size)     |                      |  / vc_video_erase_char
+ *                         +----------------------+-'
+ *                         <---- 2 * vc_cols ----->
+ *                         <---- vc_size_row ----->
+ *
+ * Note that every character in the console buffer is accompanied with an
+ * attribute in the buffer right after the character. This is not depicted
+ * in the figure.
+ */
 struct vc_data {
        struct tty_port port;                   /* Upper level data */
 
@@ -74,7 +106,6 @@ struct vc_data {
        unsigned int    vc_decawm       : 1;    /* Autowrap Mode */
        unsigned int    vc_deccm        : 1;    /* Cursor Visible */
        unsigned int    vc_decim        : 1;    /* Insert Mode */
-       unsigned int    vc_deccolm      : 1;    /* 80/132 Column Mode */
        /* attribute flags */
        unsigned int    vc_intensity    : 2;    /* 0=half-bright, 1=normal, 2=bold */
        unsigned int    vc_italic:1;
@@ -136,6 +167,9 @@ extern void vc_SAK(struct work_struct *work);
 
 #define CUR_DEFAULT CUR_UNDERLINE
 
-#define CON_IS_VISIBLE(conp) (*conp->vc_display_fg == conp)
+static inline bool con_is_visible(const struct vc_data *vc)
+{
+       return *vc->vc_display_fg == vc;
+}
 
 #endif /* _LINUX_CONSOLE_STRUCT_H */