ega.c

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/*
 * Copyright (c) 2006 Ondrej Palkovsky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdlib.h>
#include <unistd.h>
#include <align.h>
#include <async.h>
#include <errno.h>
#include <stdio.h>
#include <ddi.h>
#include <sysinfo.h>
#include <as.h>
#include <ipc/fb.h>
#include <ipc/ns.h>
#include <ipc/services.h>
#include <libarch/ddi.h>
#include <io/style.h>
#include <io/color.h>
#include <io/screenbuffer.h>
#include <sys/types.h>

#include "ega.h"
#include "main.h"

#define MAX_SAVED_SCREENS  256

typedef struct saved_screen {
        short *data;
} saved_screen;

saved_screen saved_screens[MAX_SAVED_SCREENS];

#define EGA_IO_BASE  ((ioport8_t *) 0x3d4)
#define EGA_IO_SIZE  2

/* Allow only 1 connection */
static int client_connected = 0;

static sysarg_t scr_width;
static sysarg_t scr_height;
static uint8_t *scr_addr;

static uint8_t style_normal = 0xf0;
static uint8_t style_inverted = 0x0f;
static uint8_t style;

static uint8_t style_to_ega_style(uint8_t style)
{
        switch (style) {
        case STYLE_EMPHASIS:
                return (style_normal | 0x04);
        case STYLE_SELECTED:
                return (style_inverted | 0x40);
        case STYLE_INVERTED:
                return style_inverted;
        }
        
        return style_normal;
}

static uint8_t color_to_ega_style(uint8_t fg_color, uint8_t bg_color,
    uint8_t attr)
{
        uint8_t style = (fg_color & 7) | ((bg_color & 7) << 4);
        
        if (attr & CATTR_BRIGHT)
                style |= 0x08;
        
        return style;
}

static uint8_t rgb_to_ega_style(uint32_t fg, uint32_t bg)
{
        return (fg > bg) ? style_inverted : style_normal;
}

static uint8_t attr_to_ega_style(const attrs_t *attr)
{
        switch (attr->t) {
        case at_style:
                return style_to_ega_style(attr->a.s.style);
        case at_idx:
                return color_to_ega_style(attr->a.i.fg_color,
                    attr->a.i.bg_color, attr->a.i.flags);
        case at_rgb:
                return rgb_to_ega_style(attr->a.r.fg_color, attr->a.r.bg_color);
        default:
                return style_normal;
        }
}

static uint8_t ega_glyph(wchar_t ch)
{
        if (ch >= 0 && ch < 128)
                return ch;
        
        return '?';
}

static void clrscr(void)
{
        unsigned i;
        
        for (i = 0; i < scr_width * scr_height; i++) {
                scr_addr[i * 2] = ' ';
                scr_addr[i * 2 + 1] = style;
        }
}

static void cursor_goto(sysarg_t col, sysarg_t row)
{
        sysarg_t cursor = col + scr_width * row;
        
        pio_write_8(EGA_IO_BASE, 0xe);
        pio_write_8(EGA_IO_BASE + 1, (cursor >> 8) & 0xff);
        pio_write_8(EGA_IO_BASE, 0xf);
        pio_write_8(EGA_IO_BASE + 1, cursor & 0xff);
}

static void cursor_disable(void)
{
        pio_write_8(EGA_IO_BASE, 0xa);
        
        uint8_t stat = pio_read_8(EGA_IO_BASE + 1);
        
        pio_write_8(EGA_IO_BASE, 0xa);
        pio_write_8(EGA_IO_BASE + 1, stat | (1 << 5));
}

static void cursor_enable(void)
{
        pio_write_8(EGA_IO_BASE, 0xa);
        
        uint8_t stat = pio_read_8(EGA_IO_BASE + 1);
        
        pio_write_8(EGA_IO_BASE, 0xa);
        pio_write_8(EGA_IO_BASE + 1, stat & (~(1 << 5)));
}

static void scroll(ssize_t rows)
{
        size_t i;
        
        if (rows > 0) {
                memmove(scr_addr, ((char *) scr_addr) + rows * scr_width * 2,
                    scr_width * scr_height * 2 - rows * scr_width * 2);
                for (i = 0; i < rows * scr_width; i++)
                        (((short *) scr_addr) + scr_width * scr_height - rows *
                            scr_width)[i] = ((style << 8) + ' ');
        } else if (rows < 0) {
                memmove(((char *)scr_addr) - rows * scr_width * 2, scr_addr,
                    scr_width * scr_height * 2 + rows * scr_width * 2);
                for (i = 0; i < -rows * scr_width; i++)
                        ((short *) scr_addr)[i] = ((style << 8 ) + ' ');
        }
}

static void printchar(wchar_t c, sysarg_t col, sysarg_t row)
{
        scr_addr[(row * scr_width + col) * 2] = ega_glyph(c);
        scr_addr[(row * scr_width + col) * 2 + 1] = style;
        
        cursor_goto(col + 1, row);
}

static void draw_text_data(keyfield_t *data, sysarg_t x, sysarg_t y,
    sysarg_t w, sysarg_t h)
{
        sysarg_t i;
        sysarg_t j;
        keyfield_t *field;
        uint8_t *dp;
        
        for (j = 0; j < h; j++) {
                for (i = 0; i < w; i++) {
                        field = &data[j * w + i];
                        dp = &scr_addr[2 * ((y + j) * scr_width + (x + i))];
                        
                        dp[0] = ega_glyph(field->character);
                        dp[1] = attr_to_ega_style(&field->attrs);
                }
        }
}

static int save_screen(void)
{
        sysarg_t i;
        
        /* Find empty screen */
        for (i = 0; (i < MAX_SAVED_SCREENS) && (saved_screens[i].data); i++);
        
        if (i == MAX_SAVED_SCREENS)
                return EINVAL;
        
        if (!(saved_screens[i].data = malloc(2 * scr_width * scr_height)))
                return ENOMEM;
        
        memcpy(saved_screens[i].data, scr_addr, 2 * scr_width * scr_height);
        return (int) i;
}

static int print_screen(sysarg_t i)
{
        if ((i >= MAX_SAVED_SCREENS) || (saved_screens[i].data))
                memcpy(scr_addr, saved_screens[i].data, 2 * scr_width *
                    scr_height);
        else
                return EINVAL;
        
        return (int) i;
}

static void ega_client_connection(ipc_callid_t iid, ipc_call_t *icall)
{
        size_t intersize = 0;
        keyfield_t *interbuf = NULL;
        
        if (client_connected) {
                async_answer_0(iid, ELIMIT);
                return;
        }
        
        /* Accept connection */
        client_connected = 1;
        async_answer_0(iid, EOK);
        
        while (true) {
                ipc_call_t call;
                ipc_callid_t callid = async_get_call(&call);
                
                wchar_t c;
                
                sysarg_t col;
                sysarg_t row;
                sysarg_t w;
                sysarg_t h;
                
                ssize_t rows;
                
                uint8_t bg_color;
                uint8_t fg_color;
                uint8_t attr;
                
                uint32_t fg_rgb;
                uint32_t bg_rgb;
                
                sysarg_t scr;
                int retval;
                
                switch (IPC_GET_IMETHOD(call)) {
                case IPC_M_PHONE_HUNGUP:
                        client_connected = 0;
                        async_answer_0(callid, EOK);
                        
                        /* Exit thread */
                        return;
                case IPC_M_SHARE_OUT:
                        /* We accept one area for data interchange */
                        intersize = IPC_GET_ARG2(call);
                        if (intersize >= scr_width * scr_height *
                            sizeof(*interbuf)) {
                                receive_comm_area(callid, &call,
                                    (void *) &interbuf);
                                continue;
                        }
                        
                        retval = EINVAL;
                        break;
                case FB_DRAW_TEXT_DATA:
                        if (!interbuf) {
                                retval = EINVAL;
                                break;
                        }
                        
                        col = IPC_GET_ARG1(call);
                        row = IPC_GET_ARG2(call);
                        w = IPC_GET_ARG3(call);
                        h = IPC_GET_ARG4(call);
                        
                        if ((col + w > scr_width) || (row + h > scr_height)) {
                                retval = EINVAL;
                                break;
                        }
                        
                        draw_text_data(interbuf, col, row, w, h);
                        retval = 0;
                        break;
                case FB_GET_CSIZE:
                        async_answer_2(callid, EOK, scr_width, scr_height);
                        continue;
                case FB_GET_COLOR_CAP:
                        async_answer_1(callid, EOK, FB_CCAP_INDEXED);
                        continue;
                case FB_CLEAR:
                        clrscr();
                        retval = 0;
                        break;
                case FB_PUTCHAR:
                        c = IPC_GET_ARG1(call);
                        col = IPC_GET_ARG2(call);
                        row = IPC_GET_ARG3(call);
                        
                        if ((col >= scr_width) || (row >= scr_height)) {
                                retval = EINVAL;
                                break;
                        }
                        
                        printchar(c, col, row);
                        retval = 0;
                        break;
                case FB_CURSOR_GOTO:
                        col = IPC_GET_ARG1(call);
                        row = IPC_GET_ARG2(call);
                        
                        if ((row >= scr_height) || (col >= scr_width)) {
                                retval = EINVAL;
                                break;
                        }
                        
                        cursor_goto(col, row);
                        retval = 0;
                        break;
                case FB_SCROLL:
                        rows = IPC_GET_ARG1(call);
                        
                        if (rows >= 0) {
                                if ((sysarg_t) rows > scr_height) {
                                        retval = EINVAL;
                                        break;
                                }
                        } else {
                                if ((sysarg_t) (-rows) > scr_height) {
                                        retval = EINVAL;
                                        break;
                                }
                        }
                        
                        scroll(rows);
                        retval = 0;
                        break;
                case FB_CURSOR_VISIBILITY:
                        if (IPC_GET_ARG1(call))
                                cursor_enable();
                        else
                                cursor_disable();
                        
                        retval = 0;
                        break;
                case FB_SET_STYLE:
                        style = style_to_ega_style(IPC_GET_ARG1(call));
                        retval = 0;
                        break;
                case FB_SET_COLOR:
                        fg_color = IPC_GET_ARG1(call);
                        bg_color = IPC_GET_ARG2(call);
                        attr = IPC_GET_ARG3(call);
                        
                        style = color_to_ega_style(fg_color, bg_color, attr);
                        retval = 0;
                        break;
                case FB_SET_RGB_COLOR:
                        fg_rgb = IPC_GET_ARG1(call);
                        bg_rgb = IPC_GET_ARG2(call);
                        
                        style = rgb_to_ega_style(fg_rgb, bg_rgb);
                        retval = 0;
                        break;
                case FB_VP_DRAW_PIXMAP:
                        scr = IPC_GET_ARG2(call);
                        retval = print_screen(scr);
                        break;
                case FB_VP2PIXMAP:
                        retval = save_screen();
                        break;
                case FB_DROP_PIXMAP:
                        scr = IPC_GET_ARG1(call);
                        
                        if (scr >= MAX_SAVED_SCREENS) {
                                retval = EINVAL;
                                break;
                        }
                        
                        if (saved_screens[scr].data) {
                                free(saved_screens[scr].data);
                                saved_screens[scr].data = NULL;
                        }
                        
                        retval = 0;
                        break;
                case FB_SCREEN_YIELD:
                case FB_SCREEN_RECLAIM:
                        retval = EOK;
                        break;
                default:
                        retval = EINVAL;
                }
                async_answer_0(callid, retval);
        }
}

int ega_init(void)
{
        sysarg_t paddr;
        if (sysinfo_get_value("fb.address.physical", &paddr) != EOK)
                return -1;
        
        if (sysinfo_get_value("fb.width", &scr_width) != EOK)
                return -1;
        
        if (sysinfo_get_value("fb.height", &scr_height) != EOK)
                return -1;
        
        sysarg_t blinking;
        if (sysinfo_get_value("fb.blinking", &blinking) != EOK)
                blinking = false;
        
        void *ega_ph_addr = (void *) paddr;
        if (blinking) {
                style_normal &= 0x77;
                style_inverted &= 0x77;
        }
        
        style = style_normal;
        
        iospace_enable(task_get_id(), (void *) EGA_IO_BASE, 2);
        
        size_t sz = scr_width * scr_height * 2;
        scr_addr = as_get_mappable_page(sz);
        
        if (physmem_map(ega_ph_addr, scr_addr, ALIGN_UP(sz, PAGE_SIZE) >>
            PAGE_WIDTH, AS_AREA_READ | AS_AREA_WRITE) != 0)
                return -1;
        
        async_set_client_connection(ega_client_connection);
        
        return 0;
}

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