[PATCH] TTY layer buffering revamp

[pandora-kernel.git] / include / linux / tty.h

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 1267f88..3787102 100644 (file)
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -23,6 +23,7 @@
 #include <linux/workqueue.h>
 #include <linux/tty_driver.h>
 #include <linux/tty_ldisc.h>
+#include <linux/screen_info.h>
 
 #include <asm/system.h>
 
@@ -36,77 +37,6 @@
 #define NR_UNIX98_PTY_MAX      (1 << MINORBITS) /* Absolute limit */
 #define NR_LDISCS              16
 
-/*
- * These are set up by the setup-routine at boot-time:
- */
-
-struct screen_info {
-       u8  orig_x;             /* 0x00 */
-       u8  orig_y;             /* 0x01 */
-       u16 dontuse1;           /* 0x02 -- EXT_MEM_K sits here */
-       u16 orig_video_page;    /* 0x04 */
-       u8  orig_video_mode;    /* 0x06 */
-       u8  orig_video_cols;    /* 0x07 */
-       u16 unused2;            /* 0x08 */
-       u16 orig_video_ega_bx;  /* 0x0a */
-       u16 unused3;            /* 0x0c */
-       u8  orig_video_lines;   /* 0x0e */
-       u8  orig_video_isVGA;   /* 0x0f */
-       u16 orig_video_points;  /* 0x10 */
-
-       /* VESA graphic mode -- linear frame buffer */
-       u16 lfb_width;          /* 0x12 */
-       u16 lfb_height;         /* 0x14 */
-       u16 lfb_depth;          /* 0x16 */
-       u32 lfb_base;           /* 0x18 */
-       u32 lfb_size;           /* 0x1c */
-       u16 dontuse2, dontuse3; /* 0x20 -- CL_MAGIC and CL_OFFSET here */
-       u16 lfb_linelength;     /* 0x24 */
-       u8  red_size;           /* 0x26 */
-       u8  red_pos;            /* 0x27 */
-       u8  green_size;         /* 0x28 */
-       u8  green_pos;          /* 0x29 */
-       u8  blue_size;          /* 0x2a */
-       u8  blue_pos;           /* 0x2b */
-       u8  rsvd_size;          /* 0x2c */
-       u8  rsvd_pos;           /* 0x2d */
-       u16 vesapm_seg;         /* 0x2e */
-       u16 vesapm_off;         /* 0x30 */
-       u16 pages;              /* 0x32 */
-       u16 vesa_attributes;    /* 0x34 */
-       u32  capabilities;      /* 0x36 */
-                               /* 0x3a -- 0x3f reserved for future expansion */
-};
-
-extern struct screen_info screen_info;
-
-#define ORIG_X                 (screen_info.orig_x)
-#define ORIG_Y                 (screen_info.orig_y)
-#define ORIG_VIDEO_MODE                (screen_info.orig_video_mode)
-#define ORIG_VIDEO_COLS        (screen_info.orig_video_cols)
-#define ORIG_VIDEO_EGA_BX      (screen_info.orig_video_ega_bx)
-#define ORIG_VIDEO_LINES       (screen_info.orig_video_lines)
-#define ORIG_VIDEO_ISVGA       (screen_info.orig_video_isVGA)
-#define ORIG_VIDEO_POINTS       (screen_info.orig_video_points)
-
-#define VIDEO_TYPE_MDA         0x10    /* Monochrome Text Display      */
-#define VIDEO_TYPE_CGA         0x11    /* CGA Display                  */
-#define VIDEO_TYPE_EGAM                0x20    /* EGA/VGA in Monochrome Mode   */
-#define VIDEO_TYPE_EGAC                0x21    /* EGA in Color Mode            */
-#define VIDEO_TYPE_VGAC                0x22    /* VGA+ in Color Mode           */
-#define VIDEO_TYPE_VLFB                0x23    /* VESA VGA in graphic mode     */
-
-#define VIDEO_TYPE_PICA_S3     0x30    /* ACER PICA-61 local S3 video  */
-#define VIDEO_TYPE_MIPS_G364   0x31    /* MIPS Magnum 4000 G364 video  */
-#define VIDEO_TYPE_SGI          0x33    /* Various SGI graphics hardware */
-
-#define VIDEO_TYPE_TGAC                0x40    /* DEC TGA */
-
-#define VIDEO_TYPE_SUN          0x50    /* Sun frame buffer. */
-#define VIDEO_TYPE_SUNPCI       0x51    /* Sun PCI based frame buffer. */
-
-#define VIDEO_TYPE_PMAC                0x60    /* PowerMacintosh frame buffer. */
-
 /*
  * This character is the same as _POSIX_VDISABLE: it cannot be used as
  * a c_cc[] character, but indicates that a particular special character
@@ -121,16 +51,22 @@ extern struct screen_info screen_info;
  */
 #define TTY_FLIPBUF_SIZE 512
 
-struct tty_flip_buffer {
+struct tty_buffer {
+       struct tty_buffer *next;
+       char *char_buf_ptr;
+       unsigned char *flag_buf_ptr;
+       int used;
+       int size;
+       /* Data points here */
+       unsigned long data[0];
+};
+
+struct tty_bufhead {
        struct work_struct              work;
        struct semaphore pty_sem;
-       char            *char_buf_ptr;
-       unsigned char   *flag_buf_ptr;
-       int             count;
-       int             buf_num;
-       unsigned char   char_buf[2*TTY_FLIPBUF_SIZE];
-       char            flag_buf[2*TTY_FLIPBUF_SIZE];
-       unsigned char   slop[4]; /* N.B. bug overwrites buffer by 1 */
+       struct tty_buffer *head;        /* Queue head */
+       struct tty_buffer *tail;        /* Active buffer */
+       struct tty_buffer *free;        /* Free queue head */
 };
 /*
  * The pty uses char_buf and flag_buf as a contiguous buffer
@@ -256,10 +192,11 @@ struct tty_struct {
        unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
        unsigned char low_latency:1, warned:1;
        unsigned char ctrl_status;
+       unsigned int receive_room;      /* Bytes free for queue */
 
        struct tty_struct *link;
        struct fasync_struct *fasync;
-       struct tty_flip_buffer flip;
+       struct tty_bufhead buf;
        int max_flip_cnt;
        int alt_speed;          /* For magic substitution of 38400 bps */
        wait_queue_head_t write_wait;