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42 pj 1
/* Project:     OSLib
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 * Description: The OS Construction Kit
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 * Date:                1.6.2000
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 * Idea by:             Luca Abeni & Gerardo Lamastra
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 *
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 * OSLib is an SO project aimed at developing a common, easy-to-use
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 * low-level infrastructure for developing OS kernels and Embedded
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 * Applications; it partially derives from the HARTIK project but it
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 * currently is independently developed.
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 *
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 * OSLib is distributed under GPL License, and some of its code has
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 * been derived from the Linux kernel source; also some important
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 * ideas come from studying the DJGPP go32 extender.
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 *
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 * We acknowledge the Linux Community, Free Software Foundation,
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 * D.J. Delorie and all the other developers who believe in the
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 * freedom of software and ideas.
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 *
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 * For legalese, check out the included GPL license.
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 */
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/*      Console output functions - part 2       */
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1621 fabio 24
#include <arch/i386/string.h>
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#include <arch/i386/stdlib.h>
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#include <arch/i386/stdio.h>
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#include <arch/stdarg.h>
42 pj 28
#include <ll/i386/hw-data.h>
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#include <ll/i386/hw-instr.h>
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#include <ll/i386/cons.h>
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/* #include <xsys.h>*/
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FILE(Cons2);
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#define PAGE_SIZE               2048
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#define PAGE_MAX                8
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/* CGA compatible registers */
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#define CGA_INDEX_REG   0x3D4
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#define CGA_DATA_REG    0x3D5
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#define VIDEO_ADDRESS_MSB       0x0C
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#define VIDEO_ADDRESS_LSB       0x0D
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extern int active_page;
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extern int visual_page;
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static int curs_x[PAGE_MAX];
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static int curs_y[PAGE_MAX];
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extern BYTE bios_x, bios_y, bios_attr;
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void set_visual_page(int page)
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{
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    unsigned short page_offset;
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    page_offset = page * PAGE_SIZE;
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    visual_page = page;
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    outp(CGA_INDEX_REG, VIDEO_ADDRESS_LSB);
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    outp(CGA_DATA_REG, page_offset & 0xFF);
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    outp(CGA_INDEX_REG, VIDEO_ADDRESS_MSB);
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    outp(CGA_DATA_REG, (page_offset >> 8) & 0xFF);
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}
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void set_active_page(int page)
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{
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    curs_x[active_page] = bios_x;
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    curs_y[active_page] = bios_y;
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    bios_x = curs_x[page];
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    bios_y = curs_y[page];
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    active_page = page;
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}
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int get_visual_page(void)
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{
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    return(visual_page);
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}
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int get_active_page(void)
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{
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    return(active_page);
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}
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void _clear(char c,char attr,int x1,int y1,int x2,int y2)
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{
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    register int i,j;
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    WORD w = attr;
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    w <<= 8; w |= c;
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    for (i = x1; i <= x2; i++)
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        for (j = y1; j <= y2; j++)
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            lmempokew((LIN_ADDR)(0xB8000 + 2*i+160*j + 2*active_page*PAGE_SIZE),w);
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    place(x1,y1);
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    bios_y = y1;
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    bios_x = x1;
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}
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void clear()
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{
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    _clear(' ',bios_attr,0,0,79,24);
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}
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void puts_xy(int x,int y,char attr,char *s)
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{
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    LIN_ADDR v = (LIN_ADDR)(0xB8000 + (80*y+x)*2 + active_page*(2*PAGE_SIZE));
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    while (*s != 0) {
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        /* REMEMBER! This is a macro! v++ is out to prevent side-effects */
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        lmempokeb(v,*s); s++; v++;
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        lmempokeb(v,attr); v++;
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    }
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}
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void putc_xy(int x,int y,char attr,char c)
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{
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    LIN_ADDR v = (LIN_ADDR)(0xB8000 + (80*y+x)*2 + active_page*(2*PAGE_SIZE));
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    /* REMEMBER! This is a macro! v++ is out to prevent side-effects */
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    lmempokeb(v,c); v++;
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    lmempokeb(v,attr);
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}
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char getc_xy(int x,int y,char *attr,char *c)
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{
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    LIN_ADDR v = (LIN_ADDR)(0xB8000 + (80*y+x)*2 + active_page*(2*PAGE_SIZE));
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    char r;
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    r = lmempeekb(v); v++;
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    if (c != NULL) *c = r;
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    r = lmempeekb(v);
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    if (attr != NULL) *attr = r;
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    return(r);
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}