elks-enhanced - XT-Emporium

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/*
 * Bios display driver
 * Saku Airila 1996
 * Color originally written by Mbit and Davey
 * Re-wrote for new ntty iface
 * Al Riddoch  1999
 *
 * Rewritten by Greg Haerr <greg@censoft.com> July 1999
 * added reverse video, cleaned up code, reduced size
 * added enough ansi escape sequences for visual editing
 */

#include <linuxmt/config.h>
#include <linuxmt/mm.h>
#include <linuxmt/sched.h>
#include <linuxmt/string.h>
#include <linuxmt/errno.h>
#include <linuxmt/chqueue.h>
#include <linuxmt/ntty.h>
#include <linuxmt/kd.h>
#include "console.h"
#include "console-bios.h"

/* Assumes ASCII values. */
#define isalpha(c) (((unsigned char)(((c) | 0x20) - 'a')) < 26)

#define A_DEFAULT       0x07
#define A_BOLD          0x08
#define A_UNDERLINE     0x07    /* only works on MDA, normal video on EGA */
#define A_BLINK         0x80
#define A_REVERSE       0x70
#define A_BLANK         0x00

/* character definitions*/
#define BS              '\b'
#define NL              '\n'
#define CR              '\r'
#define TAB             '\t'
#define ESC             '\x1B'
#define BEL             '\x07'

#define MAXPARMS        28

#define MAX_DISPLAYS    1

struct console;
typedef struct console Console;

struct console {
    int Width, Height;
    int cx, cy;                 /* cursor position */
    unsigned char display;
    unsigned char attr;         /* current attribute */
    unsigned char XN;           /* delayed newline on column 80 */
    unsigned char color;        /* fg/bg attr */
    void (*fsm)(Console *, int);
    int pageno;                 /* video ram page # */
#ifdef CONFIG_EMUL_ANSI
    int savex, savey;           /* saved cursor position */
    unsigned char *parmptr;     /* ptr to params */
    unsigned char params[MAXPARMS];     /* ANSI params */
#endif
};

static Console *glock;
static struct wait_queue glock_wait;
static Console *Visible[MAX_DISPLAYS];
static Console Con[MAX_CONSOLES];
static int NumConsoles = MAX_CONSOLES;
static int kraw;
static int Current_VCminor;

#ifdef CONFIG_EMUL_ANSI
#define TERM_TYPE " emulating ANSI "
#else
#define TERM_TYPE " dumb "
#endif

static void std_char(Console *, int);

static void PositionCursor(Console * C)
{
    int x, y, p;

    x = C->cx;
    y = C->cy;
    p = C->pageno;

    bios_setcursor (x, y, p);
}

static void PositionCursorGet(int * x, int * y)
{
        byte_t col, row;

        bios_getcursor (&col, &row);
        *x = col;
        *y = row;
}

static void DisplayCursor(Console * C, int onoff)
{
}

static void VideoWrite(Console * C, char c)
{
    int a, p;

    a = C->attr;
    p = C->pageno;
    bios_writecharattr (c, a, p);
}

static void scroll(Console * C, int n, int x, int y, int xx, int yy)
{
    int a;

    a = C->attr;
    if (C != Visible[C->display]) {
        bios_setpage(C->pageno);
    }

    bios_scroll (a, n, x, y, xx, yy);

    if (C != Visible[C->display]) {
        bios_setpage(Visible[C->display]->pageno);
    }
}

static void ClearRange(Console * C, int x, int y, int xx, int yy)
{
    scroll(C, 26, x, y, xx, yy);
}

static void ScrollUp(Console * C, int y)
{
    scroll(C, 1, 0, y, C->Width - 1, C->Height - 1);
}

#ifdef CONFIG_EMUL_ANSI
static void ScrollDown(Console * C, int y)
{
    scroll(C, -1, 0, y, C->Width - 1, C->Height - 1);
}
#endif

/* shared console routines*/
#include "console.c"

/* This also tells the keyboard driver which tty to direct it's output to...
 * CAUTION: It *WILL* break if the console driver doesn't get tty0-X.
 */

void Console_set_vc(int N)
{
    Console *C = &Con[N];
    if ((N >= NumConsoles) || (Visible[C->display] == C) || glock)
        return;
    Visible[C->display] = C;

    bios_setpage(N);
    PositionCursor(Visible[C->display]);
    Current_VCminor = N;
}

struct tty_ops bioscon_ops = {
    Console_open,
    Console_release,
    Console_write,
    NULL,
    Console_ioctl,
    Console_conout
};

void INITPROC console_init(void)
{
    Console *C = &Con[0];
    int i;

    C->Width = SETUP_VID_COLS;
    C->Height = SETUP_VID_LINES;

    if (peekb(0x49, 0x40) == 7)  /* BIOS data segment */
        NumConsoles = 1;

    for (i = 0; i < NumConsoles; i++) {
        C->display = 0;
        C->cx = C->cy = 0;
        if (!i) {
            Visible[C->display] = C;
            // Get current cursor position
            // to write after boot messages
            PositionCursorGet (&C->cx, &C->cy);
        }
        C->fsm = std_char;
        C->pageno = i;
        C->attr = A_DEFAULT;
        C->color = A_DEFAULT;

#ifdef CONFIG_EMUL_ANSI

        C->savex = C->savey = 0;

#endif

        /* Do not erase early printk() */
        /* ClearRange(C, 0, C->cy, C->MaxCol, C->MaxRow); */

        C++;
    }

    kbd_init();

    printk("BIOS console %ux%u"TERM_TYPE"(%d virtual consoles)\n",
           Con[0].Width, Con[0].Height, NumConsoles);
}
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