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/* Project:     OSLib
 * Description: The OS Construction Kit
 * Date:                1.6.2000
 * Idea by:             Luca Abeni & Gerardo Lamastra
 *
 * OSLib is an SO project aimed at developing a common, easy-to-use
 * low-level infrastructure for developing OS kernels and Embedded
 * Applications; it partially derives from the HARTIK project but it
 * currently is independently developed.
 *
 * OSLib is distributed under GPL License, and some of its code has
 * been derived from the Linux kernel source; also some important
 * ideas come from studying the DJGPP go32 extender.
 *
 * We acknowledge the Linux Community, Free Software Foundation,
 * D.J. Delorie and all the other developers who believe in the
 * freedom of software and ideas.
 *
 * For legalese, check out the included GPL license.
 */

/*      Console output functions        */

#include <ll/i386/hw-data.h>
#include <ll/i386/hw-instr.h>
#include <ll/i386/cons.h>
/* #include <xsys.h>*/
#include <ll/i386/string.h>
#include <ll/i386/stdlib.h>
#include <ll/i386/stdio.h>
#include <ll/stdarg.h>

FILE(Cons1);
/* CGA compatible registers value */

#define CURSOR_POS_MSB          0x0E
#define CURSOR_POS_LSB          0x0F
#define CURSOR_START            0x0A
#define CURSOR_END              0x0B

/* CGA compatible registers */

#define CGA_INDEX_REG   0x3D4
#define CGA_DATA_REG    0x3D5

/* Standard tab size */

#define TAB_SIZE        8

/* Store bios settings */

static unsigned char bios_start,bios_end;
BYTE bios_x, bios_y, bios_attr;

/* MG */
extern int cons_columns; /* number of screen columns */
extern int cons_rows;    /* number of screen rows */

/* Access directly to video & BIOS memory through linear addressing */

/* Active video page-buffer */
#define PAGE_SIZE               2048

int active_page = 0;
int visual_page = 0;

void bios_save(void)
{
    /* This function must be called to init CONSole output */
#if 1
    /* MG */
    cons_columns=lmempeekw((LIN_ADDR)0x0044a);
    cons_rows=lmempeekb((LIN_ADDR)0x00484)+1;    

    bios_attr = lmempeekb((LIN_ADDR)0xB8000 + cons_columns * 2 -1);
    bios_x = lmempeekb((LIN_ADDR)0x00450);
    bios_y = lmempeekb((LIN_ADDR)0x00451);
    bios_end = lmempeekb((LIN_ADDR)0x00460);
    bios_start = lmempeekb((LIN_ADDR)0x00461);
    active_page = visual_page = 0;
#else
    LIN_ADDR p;

    p = (LIN_ADDR)(0xB8000 + 159);
    bios_attr = *p;
    p = (LIN_ADDR)0x00450;
    bios_x = *p;
    p = (LIN_ADDR)0x00451;
    bios_y = *p;
    p = (LIN_ADDR)0x00460;
    bios_end = *p;
    p = (LIN_ADDR)0x00461;
    bios_start = *p;
    active_page = visual_page = 0;
#endif
}

void cursor(int start,int end)
{
    /* Same thing as above; Set cursor scan line */
    outp(CGA_INDEX_REG, CURSOR_START);
    outp(CGA_DATA_REG, start);
    outp(CGA_INDEX_REG, CURSOR_END);
    outp(CGA_DATA_REG, end);
}

void bios_restore(void)
{
    lmempokeb((LIN_ADDR)0x00450,bios_x);
    lmempokeb((LIN_ADDR)0x00451,bios_y);
    place(bios_x,bios_y);
    cursor(bios_start, bios_end);
}

void place(int x,int y)
{
    unsigned short cursor_word = x + y*cons_columns + active_page*PAGE_SIZE;
    /* Set cursor position                                */
    /* CGA is programmed writing first the Index register */
    /* to specify what internal register we are accessing */
    /* Then we load the Data register with the wanted val */
    outp(CGA_INDEX_REG,CURSOR_POS_LSB);
    outp(CGA_DATA_REG,cursor_word & 0xFF);
    outp(CGA_INDEX_REG,CURSOR_POS_MSB);
    outp(CGA_DATA_REG,(cursor_word >> 8) & 0xFF);
    /* Adjust temporary cursor bios position */
    bios_x = x;
    bios_y = y;
}


void _scroll(char attr,int x1,int y1,int x2,int y2)
{
    register int x,y;
    WORD xattr = attr << 8,w;
    LIN_ADDR v = (LIN_ADDR)(0xB8000 + active_page*(2*PAGE_SIZE));
     
    for (y = y1+1; y <= y2; y++)
       for (x = x1; x <= x2; x++) {
           w = lmempeekw((LIN_ADDR)(v + 2*(y*cons_columns+x)));
           lmempokew((LIN_ADDR)(v + 2*((y-1)*cons_columns+x)),w);
    }
    for (x = x1; x <= x2; x++)
        lmempokew((LIN_ADDR)(v + 2*((y-1)*cons_columns+x)),xattr);
}

void scroll(void)
{
    _scroll(bios_attr,0,0,(cons_columns-1),(cons_rows-1));
}

void cputc(char c)
{
    static unsigned short scan_x,x,y;
    LIN_ADDR v = (LIN_ADDR)(0xB8000 + active_page*(2*PAGE_SIZE));
    x = bios_x;
    y = bios_y;
    switch (c) {
        case '\t' : x += 8;            
                    if (x >= cons_columns) {
                        x = 0;
                        if (y == (cons_rows-1)) scroll();
                        else y++;
                    } else {
                        scan_x = 0;
                        while ((scan_x+8) < x) scan_x += 8;
                        x = scan_x;
                    }
                    break;
        case '\n' : x = 0;
                    if (y == (cons_rows-1)) scroll();
                    else y++;
                    break;
        case '\b' : x--;
                    lmempokeb((LIN_ADDR)(v + 2*(x + y*cons_columns)),' ');
                    x++;
                    break;
        default   : lmempokeb((LIN_ADDR)(v + 2*(x + y*cons_columns)),c);
                    x++;
                    if (x > cons_columns) {
                        x = 0;
                        if (y == (cons_rows-1)) scroll();
                        else y++;
                    }
    }
    place(x,y);
}

void cputs(char *s)
{
    char c;
    while (*s != '\0') {
        c = *s++;
        cputc(c);
    }
}