vga.c

/*
 * Dummy VGA device
 * 
 * Copyright (c) 2003-2017 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <inttypes.h>
#include <assert.h>

#include "vga.h"
#include "pci.h"

#ifdef BUILD_ESP32
#include "esp_attr.h"
#else
#define IRAM_ATTR
#endif

#ifdef BUILD_ESP32
void *pcmalloc(long size);
#else
#define pcmalloc malloc
#endif

//#define DEBUG_VBE
//#define DEBUG_VGA_REG

#define MSR_COLOR_EMULATION 0x01
#define MSR_PAGE_SELECT     0x20

#define ST01_V_RETRACE      0x08
#define ST01_DISP_ENABLE    0x01

#define VBE_DISPI_INDEX_ID              0x0
#define VBE_DISPI_INDEX_XRES            0x1
#define VBE_DISPI_INDEX_YRES            0x2
#define VBE_DISPI_INDEX_BPP             0x3
#define VBE_DISPI_INDEX_ENABLE          0x4
#define VBE_DISPI_INDEX_BANK            0x5
#define VBE_DISPI_INDEX_VIRT_WIDTH      0x6
#define VBE_DISPI_INDEX_VIRT_HEIGHT     0x7
#define VBE_DISPI_INDEX_X_OFFSET        0x8
#define VBE_DISPI_INDEX_Y_OFFSET        0x9
#define VBE_DISPI_INDEX_VIDEO_MEMORY_64K 0xa
#define VBE_DISPI_INDEX_NB              0xb

#define VBE_DISPI_ID0                   0xB0C0
#define VBE_DISPI_ID1                   0xB0C1
#define VBE_DISPI_ID2                   0xB0C2
#define VBE_DISPI_ID3                   0xB0C3
#define VBE_DISPI_ID4                   0xB0C4
#define VBE_DISPI_ID5                   0xB0C5

#define VBE_DISPI_DISABLED              0x00
#define VBE_DISPI_ENABLED               0x01
#define VBE_DISPI_GETCAPS               0x02
#define VBE_DISPI_8BIT_DAC              0x20
#define VBE_DISPI_LFB_ENABLED           0x40
#define VBE_DISPI_NOCLEARMEM            0x80

#define FB_ALLOC_ALIGN (1 << 20)

#define MAX_TEXT_WIDTH 132
#define MAX_TEXT_HEIGHT 60

struct FBDevice {
    /* the following is set by the device */
    int width;
    int height;
    int stride; /* current stride in bytes */
    uint8_t *fb_data; /* current pointer to the pixel data */
};

struct VGAState {
    FBDevice *fb_dev;
    int graphic_mode;
    uint32_t cursor_blink_time;
    int cursor_visible_phase;
    uint32_t retrace_time;
    int retrace_phase;

    uint8_t *vga_ram;
    int vga_ram_size;
    
    uint8_t sr_index;
    uint8_t sr[8];
    uint8_t gr_index;
    uint8_t gr[16];
    uint8_t ar_index;
    uint8_t ar[21];
    int ar_flip_flop;
    uint8_t cr_index;
    uint8_t cr[256]; /* CRT registers */
    uint8_t msr; /* Misc Output Register */
    uint8_t fcr; /* Feature Control Register */
    uint8_t st00; /* status 0 */
    uint8_t st01; /* status 1 */
    uint8_t dac_state;
    uint8_t dac_sub_index;
    uint8_t dac_read_index;
    uint8_t dac_write_index;
    uint8_t dac_8bit;
    uint8_t dac_cache[3]; /* used when writing */
    uint8_t palette[768];
    int32_t bank_offset;

    uint32_t latch;
    
    /* text mode state */
    uint32_t last_palette[16];
#ifndef FULL_UPDATE
    uint16_t last_ch_attr[MAX_TEXT_WIDTH * MAX_TEXT_HEIGHT];
#endif
    uint32_t last_width;
    uint32_t last_height;
    uint16_t last_line_offset;
    uint16_t last_start_addr;
    uint16_t last_cursor_offset;
    uint8_t last_cursor_start;
    uint8_t last_cursor_end;

    /* VBE extension */
    uint16_t vbe_index;
    uint16_t vbe_regs[VBE_DISPI_INDEX_NB];
    uint32_t vbe_start_addr;
    uint32_t vbe_line_offset;

#ifdef SCALE_3_2
    uint8_t tmpbuf[720 * 3 * 2];
#endif
};

#ifdef BUILD_ESP32
#include "esp_private/system_internal.h"
static uint32_t get_uticks()
{
    return esp_system_get_time();
}
#else
#include <time.h>
static uint32_t get_uticks()
{
    struct timespec ts;
    clock_gettime(CLOCK_MONOTONIC, &ts);
    return ((uint32_t) ts.tv_sec * 1000000 +
            (uint32_t) ts.tv_nsec / 1000);
}
#endif

static int after_eq(uint32_t a, uint32_t b)
{
    return (a - b) < (1u << 31);
}

#if BPP == 32
static void vga_draw_glyph8(uint8_t *d, int linesize,
                            const uint8_t *font_ptr, int h,
                            uint32_t fgcol, uint32_t bgcol)
{
    uint32_t font_data, xorcol;

    xorcol = bgcol ^ fgcol;
    do {
        font_data = font_ptr[0];
        ((uint32_t *)d)[0] = (-((font_data >> 7)) & xorcol) ^ bgcol;
        ((uint32_t *)d)[1] = (-((font_data >> 6) & 1) & xorcol) ^ bgcol;
        ((uint32_t *)d)[2] = (-((font_data >> 5) & 1) & xorcol) ^ bgcol;
        ((uint32_t *)d)[3] = (-((font_data >> 4) & 1) & xorcol) ^ bgcol;
        ((uint32_t *)d)[4] = (-((font_data >> 3) & 1) & xorcol) ^ bgcol;
        ((uint32_t *)d)[5] = (-((font_data >> 2) & 1) & xorcol) ^ bgcol;
        ((uint32_t *)d)[6] = (-((font_data >> 1) & 1) & xorcol) ^ bgcol;
        ((uint32_t *)d)[7] = (-((font_data >> 0) & 1) & xorcol) ^ bgcol;
        font_ptr += 4;
        d += linesize;
    } while (--h);
}

static void vga_draw_glyph9(uint8_t *d, int linesize,
                            const uint8_t *font_ptr, int h,
                            uint32_t fgcol, uint32_t bgcol,
                            int dup9)
{
    uint32_t font_data, xorcol, v;

    xorcol = bgcol ^ fgcol;
    do {
        font_data = font_ptr[0];
        ((uint32_t *)d)[0] = (-((font_data >> 7)) & xorcol) ^ bgcol;
        ((uint32_t *)d)[1] = (-((font_data >> 6) & 1) & xorcol) ^ bgcol;
        ((uint32_t *)d)[2] = (-((font_data >> 5) & 1) & xorcol) ^ bgcol;
        ((uint32_t *)d)[3] = (-((font_data >> 4) & 1) & xorcol) ^ bgcol;
        ((uint32_t *)d)[4] = (-((font_data >> 3) & 1) & xorcol) ^ bgcol;
        ((uint32_t *)d)[5] = (-((font_data >> 2) & 1) & xorcol) ^ bgcol;
        ((uint32_t *)d)[6] = (-((font_data >> 1) & 1) & xorcol) ^ bgcol;
        v = (-((font_data >> 0) & 1) & xorcol) ^ bgcol;
        ((uint32_t *)d)[7] = v;
        if (dup9)
            ((uint32_t *)d)[8] = v;
        else
            ((uint32_t *)d)[8] = bgcol;
        font_ptr += 4;
        d += linesize;
    } while (--h);
}
#elif BPP == 16
static void vga_draw_glyph8(uint8_t *d, int linesize,
                            const uint8_t *font_ptr, int h,
                            uint32_t fgcol, uint32_t bgcol)
{
    uint32_t font_data, xorcol;

    xorcol = bgcol ^ fgcol;
    do {
        font_data = font_ptr[0];
        ((uint16_t *)d)[0] = (-((font_data >> 7)) & xorcol) ^ bgcol;
        ((uint16_t *)d)[1] = (-((font_data >> 6) & 1) & xorcol) ^ bgcol;
        ((uint16_t *)d)[2] = (-((font_data >> 5) & 1) & xorcol) ^ bgcol;
        ((uint16_t *)d)[3] = (-((font_data >> 4) & 1) & xorcol) ^ bgcol;
        ((uint16_t *)d)[4] = (-((font_data >> 3) & 1) & xorcol) ^ bgcol;
        ((uint16_t *)d)[5] = (-((font_data >> 2) & 1) & xorcol) ^ bgcol;
        ((uint16_t *)d)[6] = (-((font_data >> 1) & 1) & xorcol) ^ bgcol;
        ((uint16_t *)d)[7] = (-((font_data >> 0) & 1) & xorcol) ^ bgcol;
        font_ptr += 4;
        d += linesize;
    } while (--h);
}

static void vga_draw_glyph9(uint8_t *d, int linesize,
                            const uint8_t *font_ptr, int h,
                            uint32_t fgcol, uint32_t bgcol,
                            int dup9)
{
    uint32_t font_data, xorcol, v;

    xorcol = bgcol ^ fgcol;
    do {
        font_data = font_ptr[0];
        ((uint16_t *)d)[0] = ((-((font_data >> 7)) & xorcol) ^ bgcol);
        ((uint16_t *)d)[1] = ((-((font_data >> 6) & 1) & xorcol) ^ bgcol);
        ((uint16_t *)d)[2] = ((-((font_data >> 5) & 1) & xorcol) ^ bgcol);
        ((uint16_t *)d)[3] = ((-((font_data >> 4) & 1) & xorcol) ^ bgcol);
        ((uint16_t *)d)[4] = ((-((font_data >> 3) & 1) & xorcol) ^ bgcol);
        ((uint16_t *)d)[5] = ((-((font_data >> 2) & 1) & xorcol) ^ bgcol);
        ((uint16_t *)d)[6] = ((-((font_data >> 1) & 1) & xorcol) ^ bgcol);
        v = (-((font_data >> 0) & 1) & xorcol) ^ bgcol;
        ((uint16_t *)d)[7] = v;
        if (dup9)
            ((uint16_t *)d)[8] = v;
        else
            ((uint16_t *)d)[8] = bgcol;
        font_ptr += 4;
        d += linesize;
    } while (--h);
}

static inline uint32_t c69(uint16_t c)
{
    // 0000 0000 0000 rrrr rggg gggb bbbb
    // 0000 0rrr rr00 0ggg ggg0 000b bbbb
    return (c & 0x1f) | ((c & 0x7e0) << 4) | ((c & 0xf800) << 7);
}

static inline uint16_t c96(uint32_t c)
{
    // 0000 0rrr rr00 0ggg ggg0 000b bbbb
    // 0000 0000 0000 rrrr rggg gggb bbbb
    uint16_t t = (c & 0x1f) | ((c & 0x7e00) >> 4) | ((c & 0x7c0000) >> 7);
#ifdef BUILD_ESP32
    return (t << 8) | (t >> 8);
#else
    return t;
#endif
}

static void scale_3_2(uint8_t *dst, int dst_stride, uint8_t *src, int w)
{
   const static int shift[4][4] = {
       { 2, 0, 1, 0 },
       { 1, 2, 0, 0 },
       { 0, 0, 2, 1 },
       { 0, 1, 0, 2 }
   };
   int ww = w / 3 * 2;
   int idx = 0;
   for (int j = 0; j < 2; j++, idx ^= 2,
#ifdef SWAPXY
                dst += BPP / 8
#else
                dst += dst_stride
#endif
           ) {
       uint8_t *dst1 = dst;
       uint8_t *src1 = src + (j * w) * (BPP / 8);
       for (int k = 0; k < ww; k++, idx ^= 1) {
           int kk = k / 2 * 3 + (k & 1);
           uint16_t *p0 = (uint16_t *) (src1 + kk * (BPP / 8));
           uint16_t *p1 = p0 + 1;
           uint16_t *p2 = p0 + w;
           uint16_t *p3 = p1 + w;
           int sh0 = shift[idx][0];
           int sh1 = shift[idx][1];
           int sh2 = shift[idx][2];
           int sh3 = shift[idx][3];
           *(uint16_t *)dst1 = c96(((c69(*p0) << sh0) + (c69(*p1) << sh1) +
                                    (c69(*p2) << sh2) + (c69(*p3) << sh3)) >> 3);
#ifdef SWAPXY
           dst1 += dst_stride;
#else
           dst1 += BPP / 8;
#endif
       }
   }
}

#else
#error "bad bpp"
#endif

static const uint8_t cursor_glyph[32] = {
    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
};

#if BPP == 32
static inline int c6_to_8(int v)
{
    int b;
    v &= 0x3f;
    b = v & 1;
    return (v << 2) | (b << 1) | b;
}

static inline unsigned int rgb_to_pixel(unsigned int r, unsigned int g,
                                        unsigned int b)
{
    return (r << 16) | (g << 8) | b;
}

static int update_palette256(VGAState *s, uint32_t *palette)
{
    int full_update, i;
    uint32_t v, col;

    full_update = 0;
    v = 0;
    for(i = 0; i < 256; i++) {
        if (s->dac_8bit) {
          col = rgb_to_pixel(s->palette[v],
                             s->palette[v + 1],
                             s->palette[v + 2]);
        } else {
          col = rgb_to_pixel(c6_to_8(s->palette[v]),
                             c6_to_8(s->palette[v + 1]),
                             c6_to_8(s->palette[v + 2]));
        }
        if (col != palette[i]) {
            full_update = 1;
            palette[i] = col;
        }
        v += 3;
    }
    return full_update;
}

static int update_palette16(VGAState *s, uint32_t *palette)
{
    int full_update, i;
    uint32_t v, col;

    full_update = 0;
    for(i = 0; i < 16; i++) {
        v = s->ar[i];
        if (s->ar[0x10] & 0x80)
            v = ((s->ar[0x14] & 0xf) << 4) | (v & 0xf);
        else
            v = ((s->ar[0x14] & 0xc) << 4) | (v & 0x3f);
        v = v * 3;
        col = (c6_to_8(s->palette[v]) << 16) |
            (c6_to_8(s->palette[v + 1]) << 8) |
            c6_to_8(s->palette[v + 2]);
        if (col != palette[i]) {
            full_update = 1;
            palette[i] = col;
        }
    }
    return full_update;
}
#elif BPP == 16
static int update_palette256(VGAState *s, uint32_t *palette)
{
    int full_update, i;
    uint32_t v, col;

    full_update = 0;
    v = 0;
    for(i = 0; i < 256; i++) {
        if (s->dac_8bit) {
            col = ((s->palette[v + 2] >> 3)) |
                ((s->palette[v + 1] >> 2) << 5) |
                ((s->palette[v] >> 3) << 11);
        } else {
            col = (s->palette[v + 2] >> 1) |
                ((s->palette[v + 1]) << 5) |
                ((s->palette[v] >> 1) << 11);
        }
        if (col != palette[i]) {
            full_update = 1;
            palette[i] = col;
        }
        v += 3;
    }
    return full_update;
}

static int update_palette16(VGAState *s, uint32_t *palette)
{
    int full_update, i;
    uint32_t v, col;

    full_update = 0;
    for(i = 0; i < 16; i++) {
        v = s->ar[i];
        if (s->ar[0x10] & 0x80)
            v = ((s->ar[0x14] & 0xf) << 4) | (v & 0xf);
        else
            v = ((s->ar[0x14] & 0xc) << 4) | (v & 0x3f);
        v = v * 3;
        col = (s->palette[v + 2] >> 1) |
              ((s->palette[v + 1]) << 5) |
              ((s->palette[v] >> 1) << 11);
        if (col != palette[i]) {
            full_update = 1;
            palette[i] = col;
        }
    }
    return full_update;
}
#else
#error "bad bpp"
#endif

/* VGA CRT controller register indices */
#define VGA_CRTC_H_TOTAL        0
#define VGA_CRTC_H_DISP         1
#define VGA_CRTC_H_BLANK_START  2
#define VGA_CRTC_H_BLANK_END    3
#define VGA_CRTC_H_SYNC_START   4
#define VGA_CRTC_H_SYNC_END     5
#define VGA_CRTC_V_TOTAL        6
#define VGA_CRTC_OVERFLOW       7
#define VGA_CRTC_PRESET_ROW     8
#define VGA_CRTC_MAX_SCAN       9
#define VGA_CRTC_CURSOR_START   0x0A
#define VGA_CRTC_CURSOR_END     0x0B
#define VGA_CRTC_START_HI       0x0C
#define VGA_CRTC_START_LO       0x0D
#define VGA_CRTC_CURSOR_HI      0x0E
#define VGA_CRTC_CURSOR_LO      0x0F
#define VGA_CRTC_V_SYNC_START   0x10
#define VGA_CRTC_V_SYNC_END     0x11
#define VGA_CRTC_V_DISP_END     0x12
#define VGA_CRTC_OFFSET         0x13
#define VGA_CRTC_UNDERLINE      0x14
#define VGA_CRTC_V_BLANK_START  0x15
#define VGA_CRTC_V_BLANK_END    0x16
#define VGA_CRTC_MODE           0x17
#define VGA_CRTC_LINE_COMPARE   0x18
#define VGA_CRTC_REGS           VGA_CRT_C

/* VGA sequencer register indices */
#define VGA_SEQ_RESET           0x00
#define VGA_SEQ_CLOCK_MODE      0x01
#define VGA_SEQ_PLANE_WRITE     0x02
#define VGA_SEQ_CHARACTER_MAP   0x03
#define VGA_SEQ_MEMORY_MODE     0x04

/* VGA sequencer register bit masks */
#define VGA_SR01_CHAR_CLK_8DOTS 0x01 /* bit 0: character clocks 8 dots wide are generated */
#define VGA_SR01_SCREEN_OFF     0x20 /* bit 5: Screen is off */
#define VGA_SR02_ALL_PLANES     0x0F /* bits 3-0: enable access to all planes */
#define VGA_SR04_EXT_MEM        0x02 /* bit 1: allows complete mem access to 256K */
#define VGA_SR04_SEQ_MODE       0x04 /* bit 2: directs system to use a sequential addressing mode */
#define VGA_SR04_CHN_4M         0x08 /* bit 3: selects modulo 4 addressing for CPU access to display memory */

/* VGA graphics controller register indices */
#define VGA_GFX_SR_VALUE        0x00
#define VGA_GFX_SR_ENABLE       0x01
#define VGA_GFX_COMPARE_VALUE   0x02
#define VGA_GFX_DATA_ROTATE     0x03
#define VGA_GFX_PLANE_READ      0x04
#define VGA_GFX_MODE            0x05
#define VGA_GFX_MISC            0x06
#define VGA_GFX_COMPARE_MASK    0x07
#define VGA_GFX_BIT_MASK        0x08

/* VGA graphics controller bit masks */
#define VGA_GR06_GRAPHICS_MODE  0x01

static bool vbe_enabled(VGAState *s)
{
    return s->vbe_regs[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED;
}

/*
 * Sanity check vbe register writes.
 *
 * As we don't have a way to signal errors to the guest in the bochs
 * dispi interface we'll go adjust the registers to the closest valid
 * value.
 */
static void vbe_fixup_regs(VGAState *s)
{
    uint16_t *r = s->vbe_regs;
    uint32_t bits, linelength, maxy, offset;

    if (!vbe_enabled(s)) {
        /* vbe is turned off -- nothing to do */
        return;
    }

    /* check depth */
    switch (r[VBE_DISPI_INDEX_BPP]) {
    case 4:
    case 8:
    case 16:
    case 24:
    case 32:
        bits = r[VBE_DISPI_INDEX_BPP];
        break;
    case 15:
        bits = 16;
        break;
    default:
        bits = r[VBE_DISPI_INDEX_BPP] = 8;
        break;
    }

    /* check width */
    r[VBE_DISPI_INDEX_XRES] &= ~7u;
    if (r[VBE_DISPI_INDEX_XRES] == 0) {
        r[VBE_DISPI_INDEX_XRES] = 8;
    }
//    if (r[VBE_DISPI_INDEX_XRES] > VBE_DISPI_MAX_XRES) {
//        r[VBE_DISPI_INDEX_XRES] = VBE_DISPI_MAX_XRES;
//    }
    r[VBE_DISPI_INDEX_VIRT_WIDTH] &= ~7u;
//    if (r[VBE_DISPI_INDEX_VIRT_WIDTH] > VBE_DISPI_MAX_XRES) {
//        r[VBE_DISPI_INDEX_VIRT_WIDTH] = VBE_DISPI_MAX_XRES;
//    }
    if (r[VBE_DISPI_INDEX_VIRT_WIDTH] < r[VBE_DISPI_INDEX_XRES]) {
        r[VBE_DISPI_INDEX_VIRT_WIDTH] = r[VBE_DISPI_INDEX_XRES];
    }

    /* check height */
    linelength = r[VBE_DISPI_INDEX_VIRT_WIDTH] * bits / 8;
//    maxy = s->vbe_size / linelength;
    if (r[VBE_DISPI_INDEX_YRES] == 0) {
        r[VBE_DISPI_INDEX_YRES] = 1;
    }
//    if (r[VBE_DISPI_INDEX_YRES] > VBE_DISPI_MAX_YRES) {
//        r[VBE_DISPI_INDEX_YRES] = VBE_DISPI_MAX_YRES;
//    }
//    if (r[VBE_DISPI_INDEX_YRES] > maxy) {
//        r[VBE_DISPI_INDEX_YRES] = maxy;
//    }

    /* check offset */
//    if (r[VBE_DISPI_INDEX_X_OFFSET] > VBE_DISPI_MAX_XRES) {
//        r[VBE_DISPI_INDEX_X_OFFSET] = VBE_DISPI_MAX_XRES;
//    }
//    if (r[VBE_DISPI_INDEX_Y_OFFSET] > VBE_DISPI_MAX_YRES) {
//        r[VBE_DISPI_INDEX_Y_OFFSET] = VBE_DISPI_MAX_YRES;
//    }
    offset = r[VBE_DISPI_INDEX_X_OFFSET] * bits / 8;
    offset += r[VBE_DISPI_INDEX_Y_OFFSET] * linelength;
//    if (offset + r[VBE_DISPI_INDEX_YRES] * linelength > s->vbe_size) {
//        r[VBE_DISPI_INDEX_Y_OFFSET] = 0;
//        offset = r[VBE_DISPI_INDEX_X_OFFSET] * bits / 8;
//        if (offset + r[VBE_DISPI_INDEX_YRES] * linelength > s->vbe_size) {
//            r[VBE_DISPI_INDEX_X_OFFSET] = 0;
//            offset = 0;
//        }
//    }

    /* update vga state */
//    r[VBE_DISPI_INDEX_VIRT_HEIGHT] = maxy;
    s->vbe_line_offset = linelength;
    s->vbe_start_addr  = offset / 4;
}

static void vbe_update_vgaregs(VGAState *s)
{
    int h, shift_control;

    if (!vbe_enabled(s)) {
        /* vbe is turned off -- nothing to do */
        return;
    }

    /* graphic mode + memory map 1 */
    s->gr[VGA_GFX_MISC] = (s->gr[VGA_GFX_MISC] & ~0x0c) | 0x04 |
        VGA_GR06_GRAPHICS_MODE;
    s->cr[VGA_CRTC_MODE] |= 3; /* no CGA modes */
    s->cr[VGA_CRTC_OFFSET] = s->vbe_line_offset >> 3;
    /* width */
    s->cr[VGA_CRTC_H_DISP] =
        (s->vbe_regs[VBE_DISPI_INDEX_XRES] >> 3) - 1;
    /* height (only meaningful if < 1024) */
    h = s->vbe_regs[VBE_DISPI_INDEX_YRES] - 1;
    s->cr[VGA_CRTC_V_DISP_END] = h;
    s->cr[VGA_CRTC_OVERFLOW] = (s->cr[VGA_CRTC_OVERFLOW] & ~0x42) |
        ((h >> 7) & 0x02) | ((h >> 3) & 0x40);
    /* line compare to 1023 */
    s->cr[VGA_CRTC_LINE_COMPARE] = 0xff;
    s->cr[VGA_CRTC_OVERFLOW] |= 0x10;
    s->cr[VGA_CRTC_MAX_SCAN] |= 0x40;

    if (s->vbe_regs[VBE_DISPI_INDEX_BPP] == 4) {
        shift_control = 0;
        s->sr/*_vbe*/[VGA_SEQ_CLOCK_MODE] &= ~8; /* no double line */
    } else {
        shift_control = 2;
        /* set chain 4 mode */
        s->sr/*_vbe*/[VGA_SEQ_MEMORY_MODE] |= VGA_SR04_CHN_4M;
        /* activate all planes */
        s->sr/*_vbe*/[VGA_SEQ_PLANE_WRITE] |= VGA_SR02_ALL_PLANES;
    }
    s->gr[VGA_GFX_MODE] = (s->gr[VGA_GFX_MODE] & ~0x60) |
        (shift_control << 5);
    s->cr[VGA_CRTC_MAX_SCAN] &= ~0x9f; /* no double scan */
}

/* the text refresh is just for debugging and initial boot message, so
   it is very incomplete */
static void vga_text_refresh(VGAState *s,
                             SimpleFBDrawFunc *redraw_func, void *opaque,
                             int full_update)
{
    FBDevice *fb_dev = s->fb_dev;
    int width, height, cwidth, cheight, cy, cx, x1, y1, width1, height1;
    int cx_min, cx_max, dup9;
    uint32_t ch_attr, line_offset, start_addr, ch_addr, ch_addr1, ch, cattr;
    uint8_t *vga_ram, *font_ptr, *dst;
    uint32_t fgcol, bgcol, cursor_offset, cursor_start, cursor_end;
    uint32_t now = get_uticks();
    if (after_eq(now, s->cursor_blink_time)) {
        s->cursor_blink_time = now + 266666;
        s->cursor_visible_phase = !s->cursor_visible_phase;
    }

    full_update = full_update || update_palette16(s, s->last_palette);

    vga_ram = s->vga_ram;

    const uint8_t *font_base[2];
    uint32_t v = s->sr[0x3];
    font_base[0] = vga_ram + (((v >> 4) & 1) | ((v << 1) & 6)) * 8192 * 4 + 2;
    font_base[1] = vga_ram + (((v >> 5) & 1) | ((v >> 1) & 6)) * 8192 * 4 + 2;
    
    line_offset = s->cr[0x13];
    line_offset <<= 3;

    start_addr = s->cr[0x0d] | (s->cr[0x0c] << 8);
    
    cheight = (s->cr[9] & 0x1f) + 1;
    cwidth = 8;
    if (!(s->sr[1] & 0x01))
        cwidth++;

    width = (s->cr[0x01] + 1);
    height = s->cr[0x12] |
        ((s->cr[0x07] & 0x02) << 7) |
        ((s->cr[0x07] & 0x40) << 3);
    height = (height + 1) / cheight;
    
    width1 = width * cwidth;
    height1 = height * cheight;
#ifdef SCALE_3_2
    if (fb_dev->width * 3 / 2 < width1 || fb_dev->height * 3 / 2 < height1 ||
        width > MAX_TEXT_WIDTH || height > MAX_TEXT_HEIGHT || cheight > 16)
        return; /* not enough space */
    x1 = (fb_dev->width * 3 / 2 - width1) / 3;
    y1 = (fb_dev->height * 3 / 2 - height1) / 3;
    full_update = 1;
#else
    if (fb_dev->width < width1 || fb_dev->height < height1 ||
        width > MAX_TEXT_WIDTH || height > MAX_TEXT_HEIGHT)
        return; /* not enough space */
    x1 = (fb_dev->width - width1) / 2;
    y1 = (fb_dev->height - height1) / 2;
    int stride = fb_dev->stride;
#endif
    if (s->last_line_offset != line_offset ||
        s->last_start_addr != start_addr ||
        s->last_width != width ||
        s->last_height != height) {
        s->last_line_offset = line_offset;
        s->last_start_addr = start_addr;
        s->last_width = width;
        s->last_height = height;
        full_update = 1;
    }
       
    /* update cursor position */
    cursor_offset = ((s->cr[0x0e] << 8) | s->cr[0x0f]) - start_addr;
    cursor_start = s->cr[0xa];
    cursor_end = s->cr[0xb];
    if (cursor_offset != s->last_cursor_offset ||
        cursor_start != s->last_cursor_start ||
        cursor_end != s->last_cursor_end) {
#ifndef FULL_UPDATE
        /* force refresh of characters with the cursor */
        if (s->last_cursor_offset < MAX_TEXT_WIDTH * MAX_TEXT_HEIGHT)
            s->last_ch_attr[s->last_cursor_offset] = -1;
        if (cursor_offset < MAX_TEXT_WIDTH * MAX_TEXT_HEIGHT)
            s->last_ch_attr[cursor_offset] = -1;
#endif
        s->last_cursor_offset = cursor_offset;
        s->last_cursor_start = cursor_start;
        s->last_cursor_end = cursor_end;
    }

    ch_addr1 = (start_addr * 4);
    cursor_offset = (start_addr + cursor_offset) * 4;
    
#if 0
    printf("text refresh %dx%d font=%dx%d start_addr=0x%x line_offset=0x%x\n",
           width, height, cwidth, cheight, start_addr, line_offset);
#endif
#ifdef SCALE_3_2
    int cb = 6;
    int nb = (width + cb - 1) / cb;
    int cxbegin = 0;
    int cxend = cb > width ? width : cb;
    int stride = (cxend - cxbegin) * cwidth * (BPP / 8);
    for (int b = 0; b < nb; b++)
    {
    int yt = 0;
    int yy = 0;
    ch_addr1 = (start_addr * 4) + cxbegin * 4;
#endif
    for(cy = 0; cy < height; cy++) {
        ch_addr = ch_addr1;
#ifdef SCALE_3_2
        dst = s->tmpbuf + yt * stride;
#else
        dst = fb_dev->fb_data + (y1 + cy * cheight) * stride + x1 * (BPP / 8);
#endif
        cx_min = width;
        cx_max = -1;
#ifdef SCALE_3_2
        for(cx = 0; cx < cxend - cxbegin; cx++) {
#else
        for(cx = 0; cx < width; cx++) {
#endif
            ch_attr = *(uint16_t *)(vga_ram + (ch_addr & 0x1fffe));
#ifdef FULL_UPDATE
            if (1) {
#else
            if (full_update || ch_attr != s->last_ch_attr[cy * width + cx] || cursor_offset == ch_addr) {
                s->last_ch_attr[cy * width + cx] = ch_attr;
#endif
                cx_min = cx_min > cx ? cx : cx_min;
                cx_max = cx_max < cx ? cx : cx_max;
                ch = ch_attr & 0xff;
                cattr = ch_attr >> 8;

                font_ptr = font_base[(cattr >> 3) & 1] + 32 * 4 * ch;
                bgcol = s->last_palette[cattr >> 4];
                fgcol = s->last_palette[cattr & 0x0f];
                if (cwidth == 8) {
                    vga_draw_glyph8(dst, stride, font_ptr, cheight,
                                    fgcol, bgcol);
                } else {
                    dup9 = 0;
                    if (ch >= 0xb0 && ch <= 0xdf && (s->ar[0x10] & 0x04))
                        dup9 = 1;
                    vga_draw_glyph9(dst, stride, font_ptr, cheight,
                                    fgcol, bgcol, dup9);
                }
                /* cursor display */
                if (cursor_offset == ch_addr && !(cursor_start & 0x20) && s->cursor_visible_phase) {
                    int line_start, line_last, h;
                    uint8_t *dst1;
                    line_start = cursor_start & 0x1f;
                    line_last = cursor_end & 0x1f;
                    if (line_last > cheight - 1)
                        line_last = cheight - 1;

                    if (line_last >= line_start && line_start < cheight) {
                        h = line_last - line_start + 1;
                        dst1 = dst + stride * line_start;
                        if (cwidth == 8) {
                            vga_draw_glyph8(dst1, stride,
                                            cursor_glyph,
                                            h, fgcol, bgcol);
                        } else {
                            vga_draw_glyph9(dst1, stride,
                                            cursor_glyph,
                                            h, fgcol, bgcol, 1);
                        }
                    }
                }
            }
            ch_addr += 4;
            dst += (BPP / 8) * cwidth;
        }
#ifdef SCALE_3_2
        int k;
        for (k = 0; k < yt + cheight - 1; k += 3) {
#ifdef SWAPXY
                int ii0 = (BPP / 8) * ((y1 + yy) + (x1 + cxbegin * cwidth * 2 / 3) * fb_dev->height);
#else
                int ii0 = (BPP / 8) * ((y1 + yy) * fb_dev->width + x1 + cxbegin * cwidth * 2 / 3);
#endif
                scale_3_2(fb_dev->fb_data + ii0, fb_dev->stride,
                          s->tmpbuf + k * stride, stride / (BPP / 8));
                yy += 2;
        }
        yt = k - (yt + cheight - 1);
        if (yt != 0) {
                yt = 3 - yt;
                memcpy(s->tmpbuf, s->tmpbuf + (k - 3) * stride, yt * stride);
        }
#endif
//        if (cx_max >= cx_min) {
//            redraw_func(opaque,
//                        x1 + cx_min * cwidth, y1 + cy * cheight,
//                        (cx_max - cx_min + 1) * cwidth, cheight);
//        }
        ch_addr1 += line_offset;
    }
#ifdef SCALE_3_2
    cxbegin += cb;
    cxend += cb;
    if (cxend > width) cxend = width;
    stride = (cxend - cxbegin) * cwidth * (BPP / 8);
    }
#endif
    redraw_func(opaque, 0, 0, fb_dev->width, fb_dev->height);
}

static void vga_graphic_refresh(VGAState *s,
                                SimpleFBDrawFunc *redraw_func, void *opaque,
                                int full_update)
{
    FBDevice *fb_dev = s->fb_dev;
    int w = (s->cr[0x01] + 1) * 8;
    int h = s->cr[0x12] |
        ((s->cr[0x07] & 0x02) << 7) |
        ((s->cr[0x07] & 0x40) << 3);
    h++;

    int shift_control = (s->gr[0x05] >> 5) & 3;
    int double_scan = (s->cr[0x09] >> 7);
    int multi_scan, multi_run;
    if (shift_control != 1) {
        multi_scan = (((s->cr[0x09] & 0x1f) + 1) << double_scan) - 1;
    } else {
        /* in CGA modes, multi_scan is ignored */
        /* XXX: is it correct ? */
        multi_scan = double_scan;
    }
    multi_run = multi_scan;

    uint32_t start_addr = s->cr[0x0d] | (s->cr[0x0c] << 8);
    uint32_t line_offset = s->cr[0x13];
    line_offset <<= 3;
    uint32_t line_compare = s->cr[0x18] |
        ((s->cr[0x07] & 0x10) << 4) |
        ((s->cr[0x09] & 0x40) << 3);
    if (vbe_enabled(s)) {
        line_offset = s->vbe_line_offset;
        start_addr = s->vbe_start_addr;
        line_compare = 65535;
    }
    uint32_t addr1 = 4 * start_addr;
    uint8_t *vram = s->vga_ram;
    uint32_t palette[256];
    int xdiv = 1;
    int bpp = 4;
    if (shift_control == 0 || shift_control == 1) {
        update_palette16(s, palette);
        if (s->sr[0x01] & 8) {
            xdiv = 2;
            if (shift_control == 1) // XXX
                w *= 2;
        }
    } else {
        if (!vbe_enabled(s)) {
            update_palette256(s, palette);
            xdiv = 2;
            bpp = 8;
        } else {
            bpp = s->vbe_regs[VBE_DISPI_INDEX_BPP];
            if (bpp == 8)
                update_palette256(s, palette);
        }
    }

    int y1 = 0;
    int i0 = 0;
#ifdef SCALE_3_2
    int hx = fb_dev->height * 3 / 2;
    int wx = fb_dev->width * 3 / 2;
    if (h < hx)
#ifdef SWAPXY
        i0 += (hx - h) / 3 * (BPP / 8);
#else
        i0 += (hx - h) / 3 * fb_dev->stride;
#endif
    else
        h = hx;
    if (w < wx)
#ifdef SWAPXY
        i0 += (wx - w) / 3 * fb_dev->stride;
#else
        i0 += (wx - w) / 3 * (BPP / 8);
#endif
    else
        w = wx;
    int yyt = 0;
    int yy = 0;
#else
    int hx = fb_dev->height;
    int wx = fb_dev->width;
    if (h < hx)
        i0 += (hx - h) / 2 * fb_dev->stride;
    else
        h = hx;
    if (w < wx)
        i0 += (wx - w) / 2 * (BPP / 8);
    else
        w = wx;
#endif
    for (int y = 0; y < h; y++) {
        uint32_t addr = addr1;
        if (!(s->cr[0x17] & 1)) {
            int shift;
            /* CGA compatibility handling */
            shift = 14 + ((s->cr[0x17] >> 6) & 1);
            addr = (addr & ~(1 << shift)) | ((y1 & 1) << shift);
        }
        if (!(s->cr[0x17] & 2)) {
            addr = (addr & ~0x8000) | ((y1 & 2) << 14);
        }
        for (int x = 0; x < w; x++) {
            int x1 = x / xdiv;
            uint32_t color;
            if (shift_control == 0) {
                int k = ((vram[addr + 4 * (x1 >> 3)] >> (7 - (x1 & 7))) & 1) << 0;
                k |= ((vram[addr + 4 * (x1 >> 3) + 1] >> (7 - (x1 & 7))) & 1) << 1;
                k |= ((vram[addr + 4 * (x1 >> 3) + 2] >> (7 - (x1 & 7))) & 1) << 2;
                k |= ((vram[addr + 4 * (x1 >> 3) + 3] >> (7 - (x1 & 7))) & 1) << 3;
                color = palette[k];
            } else if (shift_control == 1) {
                int k = ((vram[addr + 4 * (x1 >> 3) + ((x1 & 4) >> 2)] >>
                          (6 - 2 * (x1 & 3))) & 3);
                color = palette[k];
            } else
#if BPP == 32
            {
                switch (bpp) {
                case 8: {
                    int k = vram[addr + x1];
                    color = palette[k];
                    break;
                }
                case 15: {
                    int k = vram[addr + 2 * x1] | (vram[addr + 2 * x1 + 1] << 8);
                    int b = (k & ((1 << 5) - 1)) << 3;
                    int g = ((k >> 5) & ((1 << 5) - 1)) << 3;
                    int r = ((k >> 10) & ((1 << 5) - 1)) << 3;
                    color = b | (g << 8) | (r << 16);
                    break;
                }
                case 16: {
                    int k = vram[addr + 2 * x1] | (vram[addr + 2 * x1 + 1] << 8);
                    int b = (k & ((1 << 5) - 1)) << 3;
                    int g = ((k >> 5) & ((1 << 6) - 1)) << 2;
                    int r = ((k >> 11) & ((1 << 5) - 1)) << 3;
                    color = b | (g << 8) | (r << 16);
                    break;
                }
                case 24: {
                    color = vram[addr + 3 * x1] |
                        (vram[addr + 3 * x1 + 1] << 8) |
                        (vram[addr + 3 * x1 + 2] << 16);
                    break;
                }
                case 32: {
                    color = vram[addr + 4 * x1] |
                        (vram[addr + 4 * x1 + 1] << 8) |
                        (vram[addr + 4 * x1 + 2] << 16) |
                        (vram[addr + 4 * x1 + 3] << 24);
                    break;
                }
                default:
                    fprintf(stderr, "vga bpp is %d\n", bpp);
                    abort();
                }
            }
            int i = (BPP / 8) * (y * fb_dev->width + x) + i0;
            fb_dev->fb_data[i + 0] = color;
            fb_dev->fb_data[i + 1] = color >> 8;
            fb_dev->fb_data[i + 2] = color >> 16;
            fb_dev->fb_data[i + 3] = color >> 24;
#elif BPP == 16
            {
                switch (bpp) {
                case 8: {
                    color = palette[vram[addr + x1]];
                    break;
                }
                case 15: {
                    int k = vram[addr + 2 * x1] | (vram[addr + 2 * x1 + 1] << 8);
                    color = (k & 0x1f) | ((k & ~0x1f) << 1);
                    break;
                }
                case 16: {
                    color = vram[addr + 2 * x1] | (vram[addr + 2 * x1 + 1] << 8);
                    break;
                }
                case 24: {
                    color = ((vram[addr + 3 * x1] >> 3)) |
                        ((vram[addr + 3 * x1 + 1] >> 2) << 5) |
                        ((vram[addr + 3 * x1 + 2] >> 3) << 11);
                    break;
                }
                case 32: {
                    color = ((vram[addr + 4 * x1] >> 3)) |
                        ((vram[addr + 4 * x1 + 1] >> 2) << 5) |
                        ((vram[addr + 4 * x1 + 2] >> 3) << 11);
                    break;
                }
                default:
                    fprintf(stderr, "vga bpp is %d\n", bpp);
                    abort();
                }
            }
#ifdef SCALE_3_2
            int i = (BPP / 8) * (yyt * w + x);
            s->tmpbuf[i + 0] = color;
            s->tmpbuf[i + 1] = color >> 8;
#else
            int i = (BPP / 8) * (y * fb_dev->width + x) + i0;
            fb_dev->fb_data[i + 0] = color;
            fb_dev->fb_data[i + 1] = color >> 8;
#endif
#else
#error "bad bpp"
#endif
        }
        if (!multi_run) {
            int mask = (s->cr[0x17] & 3) ^ 3;
            if ((y1 & mask) == mask)
                addr1 += line_offset;
            y1++;
            multi_run = multi_scan;
        } else {
            multi_run--;
        }
#ifdef SCALE_3_2
        yyt++;
        if (yyt == 3) {
#ifdef SWAPXY
            int ii0 = (BPP / 8) * yy + i0;
#else
            int ii0 = (BPP / 8) * (yy * fb_dev->width) + i0;
#endif
            scale_3_2(fb_dev->fb_data + ii0, fb_dev->stride, s->tmpbuf, w);
            yyt = 0;
            yy += 2;
        }
#endif
    }
    redraw_func(opaque, 0, 0, fb_dev->width, fb_dev->height);
}

static void simplefb_clear(FBDevice *fb_dev,
               SimpleFBDrawFunc *redraw_func, void *opaque)
{
    memset(fb_dev->fb_data, 0, fb_dev->width * fb_dev->height * (BPP / 8));
}

int vga_step(VGAState *s)
{
    uint32_t now = get_uticks();
    int ret = 0;
    if (after_eq(now, s->retrace_time)) {
        if (s->retrace_phase == 0) {
            s->st01 |= ST01_DISP_ENABLE;
            s->retrace_phase = 1;
            s->retrace_time = now + 833;
        } else if (s->retrace_phase == 1) {
            s->st01 |= ST01_V_RETRACE;
            s->retrace_phase = 2;
            s->retrace_time = now + 833;
            ret = 1;
        } else {
            s->st01 &= ~(ST01_V_RETRACE | ST01_DISP_ENABLE);
            s->retrace_phase = 0;
#ifdef BUILD_ESP32
            s->retrace_time = now + 15000/3;
#else
            s->retrace_time = now + 15000;
#endif
        }
    }
    return ret;
}

void vga_refresh(VGAState *s,
                 SimpleFBDrawFunc *redraw_func, void *opaque, int full_update)
{
    FBDevice *fb_dev = s->fb_dev;
    int graphic_mode;
    if (!(s->ar_index & 0x20)) {
        /* blank */
        graphic_mode = 0;
    } else if (s->gr[0x06] & 1) {
        /* graphic mode */
        graphic_mode = 2;
    } else {
        /* text mode */
        graphic_mode = 1;
    }

    if (graphic_mode != s->graphic_mode) {
        s->graphic_mode = graphic_mode;
        full_update = 1;
        s->cursor_blink_time = get_uticks();
        simplefb_clear(fb_dev, redraw_func, opaque);
    }

    if (s->graphic_mode == 2) {
        vga_graphic_refresh(s, redraw_func, opaque, full_update);
    } else if (s->graphic_mode == 1) {
        vga_text_refresh(s, redraw_func, opaque, full_update);
    }
}

/* force some bits to zero */
static const uint8_t sr_mask[8] = {
    (uint8_t)~0xfc,
    (uint8_t)~0xc2,
    (uint8_t)~0xf0,
    (uint8_t)~0xc0,
    (uint8_t)~0xf1,
    (uint8_t)~0xff,
    (uint8_t)~0xff,
    (uint8_t)~0x00,
};

static const uint8_t gr_mask[16] = {
    (uint8_t)~0xf0, /* 0x00 */
    (uint8_t)~0xf0, /* 0x01 */
    (uint8_t)~0xf0, /* 0x02 */
    (uint8_t)~0xe0, /* 0x03 */
    (uint8_t)~0xfc, /* 0x04 */
    (uint8_t)~0x84, /* 0x05 */
    (uint8_t)~0xf0, /* 0x06 */
    (uint8_t)~0xf0, /* 0x07 */
    (uint8_t)~0x00, /* 0x08 */
    (uint8_t)~0xff, /* 0x09 */
    (uint8_t)~0xff, /* 0x0a */
    (uint8_t)~0xff, /* 0x0b */
    (uint8_t)~0xff, /* 0x0c */
    (uint8_t)~0xff, /* 0x0d */
    (uint8_t)~0xff, /* 0x0e */
    (uint8_t)~0xff, /* 0x0f */
};

uint32_t vga_ioport_read(VGAState *s, uint32_t addr)
{
    int val, index;

    /* check port range access depending on color/monochrome mode */
    if ((addr >= 0x3b0 && addr <= 0x3bf && (s->msr & MSR_COLOR_EMULATION)) ||
        (addr >= 0x3d0 && addr <= 0x3df && !(s->msr & MSR_COLOR_EMULATION))) {
        val = 0xff;
    } else {
        switch(addr) {
        case 0x3c0:
            if (s->ar_flip_flop == 0) {
                val = s->ar_index;
            } else {
                val = 0;
            }
            break;
        case 0x3c1:
            index = s->ar_index & 0x1f;
            if (index < 21)
                val = s->ar[index];
            else
                val = 0;
            break;
        case 0x3c2:
            val = s->st00;
            break;
        case 0x3c4:
            val = s->sr_index;
            break;
        case 0x3c5:
            val = s->sr[s->sr_index];
#ifdef DEBUG_VGA_REG
            printf("vga: read SR%x = 0x%02x\n", s->sr_index, val);
#endif
            break;
        case 0x3c7:
            val = s->dac_state;
            break;
        case 0x3c8:
            val = s->dac_write_index;
            break;
        case 0x3c9:
            val = s->palette[s->dac_read_index * 3 + s->dac_sub_index];
            if (++s->dac_sub_index == 3) {
                s->dac_sub_index = 0;
                s->dac_read_index++;
            }
            break;
        case 0x3ca:
            val = s->fcr;
            break;
        case 0x3cc:
            val = s->msr;
            break;
        case 0x3ce:
            val = s->gr_index;
            break;
        case 0x3cf:
            val = s->gr[s->gr_index];
#ifdef DEBUG_VGA_REG
            printf("vga: read GR%x = 0x%02x\n", s->gr_index, val);
#endif
            break;
        case 0x3b4:
        case 0x3d4:
            val = s->cr_index;
            break;
        case 0x3b5:
        case 0x3d5:
            val = s->cr[s->cr_index];
#ifdef DEBUG_VGA_REG
            printf("vga: read CR%x = 0x%02x\n", s->cr_index, val);
#endif
            break;
        case 0x3ba:
        case 0x3da:
            /* just toggle to fool polling */
//            s->st01 ^= ST01_V_RETRACE | ST01_DISP_ENABLE;
            val = s->st01;
            s->ar_flip_flop = 0;
            break;
        default:
            val = 0x00;
            break;
        }
    }
#if defined(DEBUG_VGA)
    printf("VGA: read addr=0x%04x data=0x%02x\n", addr, val);
#endif
    return val;
}

void vga_ioport_write(VGAState *s, uint32_t addr, uint32_t val)
{
    int index;

    /* check port range access depending on color/monochrome mode */
    if ((addr >= 0x3b0 && addr <= 0x3bf && (s->msr & MSR_COLOR_EMULATION)) ||
        (addr >= 0x3d0 && addr <= 0x3df && !(s->msr & MSR_COLOR_EMULATION)))
        return;

#ifdef DEBUG_VGA
    printf("VGA: write addr=0x%04x data=0x%02x\n", addr, val);
#endif

    switch(addr) {
    case 0x3c0:
        if (s->ar_flip_flop == 0) {
            val &= 0x3f;
            s->ar_index = val;
        } else {
            index = s->ar_index & 0x1f;
            switch(index) {
            case 0x00 ... 0x0f:
                s->ar[index] = val & 0x3f;
                break;
            case 0x10:
                s->ar[index] = val & ~0x10;
                break;
            case 0x11:
                s->ar[index] = val;
                break;
            case 0x12:
                s->ar[index] = val & ~0xc0;
                break;
            case 0x13:
                s->ar[index] = val & ~0xf0;
                break;
            case 0x14:
                s->ar[index] = val & ~0xf0;
                break;
            default:
                break;
            }
        }
        s->ar_flip_flop ^= 1;
        break;
    case 0x3c2:
        s->msr = val & ~0x10;
        break;
    case 0x3c4:
        s->sr_index = val & 7;
        break;
    case 0x3c5:
#ifdef DEBUG_VGA_REG
        printf("vga: write SR%x = 0x%02x\n", s->sr_index, val);
#endif
        s->sr[s->sr_index] = val & sr_mask[s->sr_index];
        break;
    case 0x3c7:
        s->dac_read_index = val;
        s->dac_sub_index = 0;
        s->dac_state = 3;
        break;
    case 0x3c8:
        s->dac_write_index = val;
        s->dac_sub_index = 0;
        s->dac_state = 0;
        break;
    case 0x3c9:
        s->dac_cache[s->dac_sub_index] = val;
        if (++s->dac_sub_index == 3) {
            memcpy(&s->palette[s->dac_write_index * 3], s->dac_cache, 3);
            s->dac_sub_index = 0;
            s->dac_write_index++;
        }
        break;
    case 0x3ce:
        s->gr_index = val & 0x0f;
        break;
    case 0x3cf:
#ifdef DEBUG_VGA_REG
        printf("vga: write GR%x = 0x%02x\n", s->gr_index, val);
#endif
        s->gr[s->gr_index] = val & gr_mask[s->gr_index];
        break;
    case 0x3b4:
    case 0x3d4:
        s->cr_index = val;
        break;
    case 0x3b5:
    case 0x3d5:
#ifdef DEBUG_VGA_REG
        printf("vga: write CR%x = 0x%02x\n", s->cr_index, val);
#endif
        /* handle CR0-7 protection */
        if ((s->cr[0x11] & 0x80) && s->cr_index <= 7) {
            /* can always write bit 4 of CR7 */
            if (s->cr_index == 7)
                s->cr[7] = (s->cr[7] & ~0x10) | (val & 0x10);
            return;
        }
        switch(s->cr_index) {
        case 0x01: /* horizontal display end */
        case 0x07:
        case 0x09:
        case 0x0c:
        case 0x0d:
        case 0x12: /* vertical display end */
            s->cr[s->cr_index] = val;
            break;
        default:
            s->cr[s->cr_index] = val;
            break;
        }
        break;
    case 0x3ba:
    case 0x3da:
        s->fcr = val & 0x10;
        break;
    }
}

#define VGA_IO(base) \
static uint32_t vga_read_ ## base(void *opaque, uint32_t addr, int size_log2)\
{\
    return vga_ioport_read(opaque, base + addr);\
}\
static void vga_write_ ## base(void *opaque, uint32_t addr, uint32_t val, int size_log2)\
{\
    return vga_ioport_write(opaque, base + addr, val);\
}

VGA_IO(0x3c0)
VGA_IO(0x3b4)
VGA_IO(0x3d4)
VGA_IO(0x3ba)
VGA_IO(0x3da)

void vbe_write(VGAState *s, uint32_t offset, uint32_t val)
{
    FBDevice *fb_dev = s->fb_dev;

    if (offset == 0) {
        s->vbe_index = val;
    } else {
#ifdef DEBUG_VBE
        printf("VBE write: index=0x%04x val=0x%04x\n", s->vbe_index, val);
#endif
        switch(s->vbe_index) {
        case VBE_DISPI_INDEX_ID:
            if (val >= VBE_DISPI_ID0 && val <= VBE_DISPI_ID5)
                s->vbe_regs[s->vbe_index] = val;
            break;
        case VBE_DISPI_INDEX_ENABLE:
            if ((val & VBE_DISPI_ENABLED) &&
                !(s->vbe_regs[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED)) {
                s->vbe_regs[VBE_DISPI_INDEX_VIRT_WIDTH] =
                    s->vbe_regs[VBE_DISPI_INDEX_XRES];
                s->vbe_regs[VBE_DISPI_INDEX_VIRT_HEIGHT] =
                    s->vbe_regs[VBE_DISPI_INDEX_YRES];
                s->vbe_regs[VBE_DISPI_INDEX_X_OFFSET] = 0;
                s->vbe_regs[VBE_DISPI_INDEX_Y_OFFSET] = 0;
            } else {
                s->bank_offset = 0;
            }
            s->dac_8bit = (val & VBE_DISPI_8BIT_DAC) > 0;
            s->vbe_regs[s->vbe_index] = val;
            vbe_fixup_regs(s);
            vbe_update_vgaregs(s);
            /* clear the screen */
            if (!(val & VBE_DISPI_NOCLEARMEM)) {
                memset(s->vga_ram, 0,
                       s->vbe_regs[VBE_DISPI_INDEX_YRES] * s->vbe_line_offset);
            }
            break;
        case VBE_DISPI_INDEX_XRES:
        case VBE_DISPI_INDEX_YRES:
        case VBE_DISPI_INDEX_BPP:
        case VBE_DISPI_INDEX_VIRT_WIDTH:
        case VBE_DISPI_INDEX_VIRT_HEIGHT:
        case VBE_DISPI_INDEX_X_OFFSET:
        case VBE_DISPI_INDEX_Y_OFFSET:
            s->vbe_regs[s->vbe_index] = val;
            vbe_fixup_regs(s);
            vbe_update_vgaregs(s);
            break;
        case VBE_DISPI_INDEX_BANK:
            val &= (s->vga_ram_size >> 16) - 1;
            s->vbe_regs[s->vbe_index] = val;
            s->bank_offset = (val << 16);
            break;
        }
    }
}

uint32_t vbe_read(VGAState *s, uint32_t offset)
{
    uint32_t val;

    if (offset == 0) {
        val = s->vbe_index;
    } else {
        if (s->vbe_regs[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_GETCAPS) {
            switch(s->vbe_index) {
            case VBE_DISPI_INDEX_XRES:
#ifdef SCALE_3_2
                val = s->fb_dev->width * 3 / 2;
#else
                val = s->fb_dev->width;
#endif
                break;
            case VBE_DISPI_INDEX_YRES:
#ifdef SCALE_3_2
                val = s->fb_dev->height * 3 / 2;
#else
                val = s->fb_dev->height;
#endif
                break;
            case VBE_DISPI_INDEX_BPP:
                val = 32;
                break;
            default:
                goto read_reg;
            }
        } else {
        read_reg:
            if (s->vbe_index < VBE_DISPI_INDEX_NB)
                val = s->vbe_regs[s->vbe_index];
            else
                val = 0;
        }
#ifdef DEBUG_VBE
        printf("VBE read: index=0x%04x val=0x%04x\n", s->vbe_index, val);
#endif
    }
    return val;
}

#define cbswap_32(__x) \
((uint32_t)( \
                (((uint32_t)(__x) & (uint32_t)0x000000ffUL) << 24) | \
                (((uint32_t)(__x) & (uint32_t)0x0000ff00UL) <<  8) | \
                (((uint32_t)(__x) & (uint32_t)0x00ff0000UL) >>  8) | \
                (((uint32_t)(__x) & (uint32_t)0xff000000UL) >> 24) ))

#ifdef HOST_WORDS_BIGENDIAN
#define PAT(x) cbswap_32(x)
#else
#define PAT(x) (x)
#endif

#ifdef HOST_WORDS_BIGENDIAN
#define GET_PLANE(data, p) (((data) >> (24 - (p) * 8)) & 0xff)
#else
#define GET_PLANE(data, p) (((data) >> ((p) * 8)) & 0xff)
#endif

static const uint32_t mask16[16] = {
    PAT(0x00000000),
    PAT(0x000000ff),
    PAT(0x0000ff00),
    PAT(0x0000ffff),
    PAT(0x00ff0000),
    PAT(0x00ff00ff),
    PAT(0x00ffff00),
    PAT(0x00ffffff),
    PAT(0xff000000),
    PAT(0xff0000ff),
    PAT(0xff00ff00),
    PAT(0xff00ffff),
    PAT(0xffff0000),
    PAT(0xffff00ff),
    PAT(0xffffff00),
    PAT(0xffffffff),
};

#define VGA_SEQ_RESET           0x00
#define VGA_SEQ_CLOCK_MODE      0x01
#define VGA_SEQ_PLANE_WRITE     0x02
#define VGA_SEQ_CHARACTER_MAP   0x03
#define VGA_SEQ_MEMORY_MODE     0x04

#define VGA_SR01_CHAR_CLK_8DOTS 0x01 /* bit 0: character clocks 8 dots wide are generated */
#define VGA_SR01_SCREEN_OFF     0x20 /* bit 5: Screen is off */
#define VGA_SR02_ALL_PLANES     0x0F /* bits 3-0: enable access to all planes */
#define VGA_SR04_EXT_MEM        0x02 /* bit 1: allows complete mem access to 256K */
#define VGA_SR04_SEQ_MODE       0x04 /* bit 2: directs system to use a sequential addressing mode */
#define VGA_SR04_CHN_4M         0x08 /* bit 3: selects modulo 4 addressing for CPU access to display memory */

#define VGA_GFX_SR_VALUE        0x00
#define VGA_GFX_SR_ENABLE       0x01
#define VGA_GFX_COMPARE_VALUE   0x02
#define VGA_GFX_DATA_ROTATE     0x03
#define VGA_GFX_PLANE_READ      0x04
#define VGA_GFX_MODE            0x05
#define VGA_GFX_MISC            0x06
#define VGA_GFX_COMPARE_MASK    0x07
#define VGA_GFX_BIT_MASK        0x08

//#define DEBUG_VGA_MEM
//#define TARGET_FMT_plx "%x"
void IRAM_ATTR vga_mem_write16(VGAState *s, uint32_t addr, uint16_t val16)
{
    if (!(s->sr[VGA_SEQ_MEMORY_MODE] & VGA_SR04_CHN_4M)) {
        vga_mem_write(s, addr, val16);
        vga_mem_write(s, addr + 1, val16 >> 8);
        return;
    }
    uint32_t val = val16;

    int memory_map_mode, plane, write_mode, b, func_select, mask;
    uint32_t write_mask, bit_mask, set_mask;

#ifdef DEBUG_VGA_MEM
    printf("vga: [0x" TARGET_FMT_plx "] = 0x%02x\n", addr, val);
#endif
    /* convert to VGA memory offset */
    memory_map_mode = (s->gr[VGA_GFX_MISC] >> 2) & 3;
    addr &= 0x1ffff;
    switch(memory_map_mode) {
    case 0:
        break;
    case 1:
        if (addr >= 0x10000)
            return;
        addr += s->bank_offset;
        break;
    case 2:
        addr -= 0x10000;
        if (addr >= 0x8000)
            return;
        break;
    default:
    case 3:
        addr -= 0x18000;
        if (addr >= 0x8000)
            return;
        break;
    }

    /* chain 4 mode : simplest access */
    plane = addr & 3;
    mask = (1 << plane);
    if (s->sr[VGA_SEQ_PLANE_WRITE] & mask) {
        * (uint16_t *) &(s->vga_ram[addr]) = val;
    }
}

void IRAM_ATTR vga_mem_write32(VGAState *s, uint32_t addr, uint32_t val)
{
    if (!(s->sr[VGA_SEQ_MEMORY_MODE] & VGA_SR04_CHN_4M)) {
        vga_mem_write(s, addr, val);
        vga_mem_write(s, addr + 1, val >> 8);
        vga_mem_write(s, addr + 2, val >> 16);
        vga_mem_write(s, addr + 3, val >> 24);
        return;
    }

    int memory_map_mode, plane, write_mode, b, func_select, mask;
    uint32_t write_mask, bit_mask, set_mask;

#ifdef DEBUG_VGA_MEM
    printf("vga: [0x" TARGET_FMT_plx "] = 0x%02x\n", addr, val);
#endif
    /* convert to VGA memory offset */
    memory_map_mode = (s->gr[VGA_GFX_MISC] >> 2) & 3;
    addr &= 0x1ffff;
    switch(memory_map_mode) {
    case 0:
        break;
    case 1:
        if (addr >= 0x10000)
            return;
        addr += s->bank_offset;
        break;
    case 2:
        addr -= 0x10000;
        if (addr >= 0x8000)
            return;
        break;
    default:
    case 3:
        addr -= 0x18000;
        if (addr >= 0x8000)
            return;
        break;
    }

    /* chain 4 mode : simplest access */
    plane = addr & 3;
    mask = (1 << plane);
    if (s->sr[VGA_SEQ_PLANE_WRITE] & mask) {
        * (uint32_t *) &(s->vga_ram[addr]) = val;
    }
}

bool IRAM_ATTR vga_mem_write_string(VGAState *s, uint32_t addr, uint8_t *buf, int len)
{
    if (!(s->sr[VGA_SEQ_MEMORY_MODE] & VGA_SR04_CHN_4M)) {
        return false;
    }

    int memory_map_mode, plane, write_mode, b, func_select, mask;
    uint32_t write_mask, bit_mask, set_mask;

#ifdef DEBUG_VGA_MEM
    printf("vga: [0x" TARGET_FMT_plx "] = 0x%02x\n", addr, val);
#endif
    /* convert to VGA memory offset */
    memory_map_mode = (s->gr[VGA_GFX_MISC] >> 2) & 3;
    addr &= 0x1ffff;
    switch(memory_map_mode) {
    case 0:
        break;
    case 1:
        if (addr >= 0x10000)
            return false;
        addr += s->bank_offset;
        break;
    case 2:
        addr -= 0x10000;
        if (addr >= 0x8000)
            return false;
        break;
    default:
    case 3:
        addr -= 0x18000;
        if (addr >= 0x8000)
            return false;
        break;
    }

    /* chain 4 mode : simplest access */
    plane = addr & 3;
    mask = (1 << plane);
    if (s->sr[VGA_SEQ_PLANE_WRITE] & mask) {
        memcpy(s->vga_ram + addr, buf, len);
        return true;
    }
    return false;
}

void IRAM_ATTR vga_mem_write(VGAState *s, uint32_t addr, uint8_t val8)
{
    uint32_t val = val8;

    int memory_map_mode, plane, write_mode, b, func_select, mask;
    uint32_t write_mask, bit_mask, set_mask;

#ifdef DEBUG_VGA_MEM
    printf("vga: [0x" TARGET_FMT_plx "] = 0x%02x\n", addr, val);
#endif
    /* convert to VGA memory offset */
    memory_map_mode = (s->gr[VGA_GFX_MISC] >> 2) & 3;
    addr &= 0x1ffff;
    switch(memory_map_mode) {
    case 0:
        break;
    case 1:
        if (addr >= 0x10000)
            return;
        addr += s->bank_offset;
        break;
    case 2:
        addr -= 0x10000;
        if (addr >= 0x8000)
            return;
        break;
    default:
    case 3:
        addr -= 0x18000;
        if (addr >= 0x8000)
            return;
        break;
    }

    if (s->sr[VGA_SEQ_MEMORY_MODE] & VGA_SR04_CHN_4M) {
        /* chain 4 mode : simplest access */
        plane = addr & 3;
        mask = (1 << plane);
        if (s->sr[VGA_SEQ_PLANE_WRITE] & mask) {
            s->vga_ram[addr] = val;
#ifdef DEBUG_VGA_MEM
            printf("vga: chain4: [0x" TARGET_FMT_plx "]\n", addr);
#endif
//            s->plane_updated |= mask; /* only used to detect font change */
//            memory_region_set_dirty(&s->vram, addr, 1);
        }
    } else if (s->gr[VGA_GFX_MODE] & 0x10) {
        /* odd/even mode (aka text mode mapping) */
        plane = (s->gr[VGA_GFX_PLANE_READ] & 2) | (addr & 1);
        mask = (1 << plane);
        if (s->sr[VGA_SEQ_PLANE_WRITE] & mask) {
            addr = ((addr & ~1) << 1) | plane;
            if (addr >= s->vga_ram_size) {
                return;
            }
            s->vga_ram[addr] = val;
#ifdef DEBUG_VGA_MEM
            printf("vga: odd/even: [0x" TARGET_FMT_plx "]\n", addr);
#endif
//            s->plane_updated |= mask; /* only used to detect font change */
//            memory_region_set_dirty(&s->vram, addr, 1);
        }
    } else {
        /* standard VGA latched access */
        write_mode = s->gr[VGA_GFX_MODE] & 3;
        switch(write_mode) {
        default:
        case 0:
            /* rotate */
            b = s->gr[VGA_GFX_DATA_ROTATE] & 7;
            val = ((val >> b) | (val << (8 - b))) & 0xff;
            val |= val << 8;
            val |= val << 16;

            /* apply set/reset mask */
            set_mask = mask16[s->gr[VGA_GFX_SR_ENABLE]];
            val = (val & ~set_mask) |
                (mask16[s->gr[VGA_GFX_SR_VALUE]] & set_mask);
            bit_mask = s->gr[VGA_GFX_BIT_MASK];
            break;
        case 1:
            val = s->latch;
            goto do_write;
        case 2:
            val = mask16[val & 0x0f];
            bit_mask = s->gr[VGA_GFX_BIT_MASK];
            break;
        case 3:
            /* rotate */
            b = s->gr[VGA_GFX_DATA_ROTATE] & 7;
            val = (val >> b) | (val << (8 - b));

            bit_mask = s->gr[VGA_GFX_BIT_MASK] & val;
            val = mask16[s->gr[VGA_GFX_SR_VALUE]];
            break;
        }

        /* apply logical operation */
        func_select = s->gr[VGA_GFX_DATA_ROTATE] >> 3;
        switch(func_select) {
        case 0:
        default:
            /* nothing to do */
            break;
        case 1:
            /* and */
            val &= s->latch;
            break;
        case 2:
            /* or */
            val |= s->latch;
            break;
        case 3:
            /* xor */
            val ^= s->latch;
            break;
        }

        /* apply bit mask */
        bit_mask |= bit_mask << 8;
        bit_mask |= bit_mask << 16;
        val = (val & bit_mask) | (s->latch & ~bit_mask);

    do_write:
        /* mask data according to sr[2] */
        mask = s->sr[VGA_SEQ_PLANE_WRITE];
//        s->plane_updated |= mask; /* only used to detect font change */
        write_mask = mask16[mask];
        if (addr * sizeof(uint32_t) >= s->vga_ram_size) {
            return;
        }
        ((uint32_t *)s->vga_ram)[addr] =
            (((uint32_t *)s->vga_ram)[addr] & ~write_mask) |
            (val & write_mask);
#ifdef DEBUG_VGA_MEM
        printf("vga: latch: [0x" TARGET_FMT_plx "] mask=0x%08x val=0x%08x\n",
               addr * 4, write_mask, val);
#endif
//        memory_region_set_dirty(&s->vram, addr << 2, sizeof(uint32_t));
    }
}

uint8_t vga_mem_read(VGAState *s, uint32_t addr)
{
    int memory_map_mode, plane;
    uint32_t ret;

    /* convert to VGA memory offset */
    memory_map_mode = (s->gr[VGA_GFX_MISC] >> 2) & 3;
    addr &= 0x1ffff;
    switch(memory_map_mode) {
    case 0:
        break;
    case 1:
        if (addr >= 0x10000)
            return 0xff;
        addr += s->bank_offset;
        break;
    case 2:
        addr -= 0x10000;
        if (addr >= 0x8000)
            return 0xff;
        break;
    default:
    case 3:
        addr -= 0x18000;
        if (addr >= 0x8000)
            return 0xff;
        break;
    }

    if (s->sr[VGA_SEQ_MEMORY_MODE] & VGA_SR04_CHN_4M) {
        /* chain 4 mode : simplest access */
//        assert(addr < s->vram_size);
        ret = s->vga_ram[addr];
    } else if (s->gr[VGA_GFX_MODE] & 0x10) {
        /* odd/even mode (aka text mode mapping) */
        plane = (s->gr[VGA_GFX_PLANE_READ] & 2) | (addr & 1);
        addr = ((addr & ~1) << 1) | plane;
        if (addr >= s->vga_ram_size) { // s->vram_size) {
            return 0xff;
        }
        ret = s->vga_ram[addr];
    } else {
        /* standard VGA latched access */
        if (addr * sizeof(uint32_t) >= s->vga_ram_size) {//s->vram_size) {
            return 0xff;
        }
        s->latch = ((uint32_t *)s->vga_ram)[addr];

        if (!(s->gr[VGA_GFX_MODE] & 0x08)) {
            /* read mode 0 */
            plane = s->gr[VGA_GFX_PLANE_READ];
            ret = GET_PLANE(s->latch, plane);
        } else {
            /* read mode 1 */
            ret = (s->latch ^ mask16[s->gr[VGA_GFX_COMPARE_VALUE]]) &
                mask16[s->gr[VGA_GFX_COMPARE_MASK]];
            ret |= ret >> 16;
            ret |= ret >> 8;
            ret = (~ret) & 0xff;
        }
    }
    return ret;
}

static void vga_initmode(VGAState *s);

VGAState *vga_init(char *vga_ram, int vga_ram_size,
                   uint8_t *fb, int width, int height)
{
    VGAState *s;

    s = pcmalloc(sizeof(*s));
    memset(s, 0, sizeof(*s));
    FBDevice *fb_dev = pcmalloc(sizeof(FBDevice));
    s->fb_dev = fb_dev;
    memset(s->fb_dev, 0, sizeof(FBDevice));
    s->graphic_mode = 0;
    s->cursor_blink_time = get_uticks();
    s->cursor_visible_phase = 1;
    s->retrace_time = get_uticks();
    s->retrace_phase = 0;
    fb_dev->width = width;
    fb_dev->height = height;
#ifdef SWAPXY
    fb_dev->stride = height * (BPP / 8);
#else
    fb_dev->stride = width * (BPP / 8);
#endif
    fb_dev->fb_data = fb;

    s->vga_ram = (uint8_t *) vga_ram;
    s->vga_ram_size = vga_ram_size;

    s->vbe_regs[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5;
    s->vbe_regs[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = s->vga_ram_size >> 16;

    vga_initmode(s);
    return s;
}

PCIDevice *vga_pci_init(VGAState *s, PCIBus *bus,
                        void *o, void (*set_bar)(void *, int, uint32_t, bool))
{
    PCIDevice *d;
    d = pci_register_device(bus, "VGA", -1, 0x1234, 0x1111, 0x00, 0x0300);

    uint32_t bar_size;
    bar_size = 1;
    while (bar_size < s->vga_ram_size)
        bar_size <<= 1;
    pci_register_bar(d, 0, bar_size, PCI_ADDRESS_SPACE_MEM, o, set_bar);
    return d;
}

// from vgabios
// stdvga mode 2
const static uint8_t pal_ega[] = {
    0x00,0x00,0x00, 0x00,0x00,0x2a, 0x00,0x2a,0x00, 0x00,0x2a,0x2a,
    0x2a,0x00,0x00, 0x2a,0x00,0x2a, 0x2a,0x2a,0x00, 0x2a,0x2a,0x2a,
    0x00,0x00,0x15, 0x00,0x00,0x3f, 0x00,0x2a,0x15, 0x00,0x2a,0x3f,
    0x2a,0x00,0x15, 0x2a,0x00,0x3f, 0x2a,0x2a,0x15, 0x2a,0x2a,0x3f,
    0x00,0x15,0x00, 0x00,0x15,0x2a, 0x00,0x3f,0x00, 0x00,0x3f,0x2a,
    0x2a,0x15,0x00, 0x2a,0x15,0x2a, 0x2a,0x3f,0x00, 0x2a,0x3f,0x2a,
    0x00,0x15,0x15, 0x00,0x15,0x3f, 0x00,0x3f,0x15, 0x00,0x3f,0x3f,
    0x2a,0x15,0x15, 0x2a,0x15,0x3f, 0x2a,0x3f,0x15, 0x2a,0x3f,0x3f,
    0x15,0x00,0x00, 0x15,0x00,0x2a, 0x15,0x2a,0x00, 0x15,0x2a,0x2a,
    0x3f,0x00,0x00, 0x3f,0x00,0x2a, 0x3f,0x2a,0x00, 0x3f,0x2a,0x2a,
    0x15,0x00,0x15, 0x15,0x00,0x3f, 0x15,0x2a,0x15, 0x15,0x2a,0x3f,
    0x3f,0x00,0x15, 0x3f,0x00,0x3f, 0x3f,0x2a,0x15, 0x3f,0x2a,0x3f,
    0x15,0x15,0x00, 0x15,0x15,0x2a, 0x15,0x3f,0x00, 0x15,0x3f,0x2a,
    0x3f,0x15,0x00, 0x3f,0x15,0x2a, 0x3f,0x3f,0x00, 0x3f,0x3f,0x2a,
    0x15,0x15,0x15, 0x15,0x15,0x3f, 0x15,0x3f,0x15, 0x15,0x3f,0x3f,
    0x3f,0x15,0x15, 0x3f,0x15,0x3f, 0x3f,0x3f,0x15, 0x3f,0x3f,0x3f
};

const static uint8_t actl[] = {
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07,
    0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
    0x0c, 0x00, 0x0f, 0x08 };

const static uint8_t sequ[] = { 0x00, 0x03, 0x00, 0x02 };

const static uint8_t grdc[] = {
    0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x0e, 0x0f, 0xff };

const static uint8_t crtc[] = {
    0x5f, 0x4f, 0x50, 0x82, 0x55, 0x81, 0xbf, 0x1f,
    0x00, 0x4f, 0x0d, 0x0e, 0x00, 0x00, 0x00, 0x00,
    0x9c, 0x8e, 0x8f, 0x28, 0x1f, 0x96, 0xb9, 0xa3,
    0xff };

const static uint8_t vgafont16[256 * 16] = {
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x7e, 0x81, 0xa5, 0x81, 0x81, 0xbd, 0x99, 0x81, 0x81, 0x7e, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x7e, 0xff, 0xdb, 0xff, 0xff, 0xc3, 0xe7, 0xff, 0xff, 0x7e, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x6c, 0xfe, 0xfe, 0xfe, 0xfe, 0x7c, 0x38, 0x10, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x10, 0x38, 0x7c, 0xfe, 0x7c, 0x38, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x18, 0x3c, 0x3c, 0xe7, 0xe7, 0xe7, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x18, 0x3c, 0x7e, 0xff, 0xff, 0x7e, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x3c, 0x3c, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe7, 0xc3, 0xc3, 0xe7, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x66, 0x42, 0x42, 0x66, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x00,
 0xff, 0xff, 0xff, 0xff, 0xff, 0xc3, 0x99, 0xbd, 0xbd, 0x99, 0xc3, 0xff, 0xff, 0xff, 0xff, 0xff,
 0x00, 0x00, 0x1e, 0x0e, 0x1a, 0x32, 0x78, 0xcc, 0xcc, 0xcc, 0xcc, 0x78, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x3c, 0x66, 0x66, 0x66, 0x66, 0x3c, 0x18, 0x7e, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x3f, 0x33, 0x3f, 0x30, 0x30, 0x30, 0x30, 0x70, 0xf0, 0xe0, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x7f, 0x63, 0x7f, 0x63, 0x63, 0x63, 0x63, 0x67, 0xe7, 0xe6, 0xc0, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x18, 0x18, 0xdb, 0x3c, 0xe7, 0x3c, 0xdb, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfe, 0xf8, 0xf0, 0xe0, 0xc0, 0x80, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x02, 0x06, 0x0e, 0x1e, 0x3e, 0xfe, 0x3e, 0x1e, 0x0e, 0x06, 0x02, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x18, 0x3c, 0x7e, 0x18, 0x18, 0x18, 0x7e, 0x3c, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x00, 0x66, 0x66, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x7f, 0xdb, 0xdb, 0xdb, 0x7b, 0x1b, 0x1b, 0x1b, 0x1b, 0x1b, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x7c, 0xc6, 0x60, 0x38, 0x6c, 0xc6, 0xc6, 0x6c, 0x38, 0x0c, 0xc6, 0x7c, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xfe, 0xfe, 0xfe, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x18, 0x3c, 0x7e, 0x18, 0x18, 0x18, 0x7e, 0x3c, 0x18, 0x7e, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x18, 0x3c, 0x7e, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x7e, 0x3c, 0x18, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x0c, 0xfe, 0x0c, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x60, 0xfe, 0x60, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0xc0, 0xc0, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x24, 0x66, 0xff, 0x66, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x10, 0x38, 0x38, 0x7c, 0x7c, 0xfe, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0xfe, 0xfe, 0x7c, 0x7c, 0x38, 0x38, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x18, 0x3c, 0x3c, 0x3c, 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x66, 0x66, 0x66, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x6c, 0x6c, 0xfe, 0x6c, 0x6c, 0x6c, 0xfe, 0x6c, 0x6c, 0x00, 0x00, 0x00, 0x00,
 0x18, 0x18, 0x7c, 0xc6, 0xc2, 0xc0, 0x7c, 0x06, 0x06, 0x86, 0xc6, 0x7c, 0x18, 0x18, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0xc2, 0xc6, 0x0c, 0x18, 0x30, 0x60, 0xc6, 0x86, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x38, 0x6c, 0x6c, 0x38, 0x76, 0xdc, 0xcc, 0xcc, 0xcc, 0x76, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x30, 0x30, 0x30, 0x60, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x0c, 0x18, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x18, 0x0c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x30, 0x18, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x18, 0x30, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x66, 0x3c, 0xff, 0x3c, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x7e, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x18, 0x30, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x02, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0x80, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x3c, 0x66, 0xc3, 0xc3, 0xdb, 0xdb, 0xc3, 0xc3, 0x66, 0x3c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x18, 0x38, 0x78, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x7e, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x7c, 0xc6, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0xc6, 0xfe, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x7c, 0xc6, 0x06, 0x06, 0x3c, 0x06, 0x06, 0x06, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x0c, 0x1c, 0x3c, 0x6c, 0xcc, 0xfe, 0x0c, 0x0c, 0x0c, 0x1e, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xfe, 0xc0, 0xc0, 0xc0, 0xfc, 0x06, 0x06, 0x06, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x38, 0x60, 0xc0, 0xc0, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xfe, 0xc6, 0x06, 0x06, 0x0c, 0x18, 0x30, 0x30, 0x30, 0x30, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0x7e, 0x06, 0x06, 0x06, 0x0c, 0x78, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x18, 0x18, 0x30, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x06, 0x0c, 0x18, 0x30, 0x60, 0x30, 0x18, 0x0c, 0x06, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x60, 0x30, 0x18, 0x0c, 0x06, 0x0c, 0x18, 0x30, 0x60, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0x0c, 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xde, 0xde, 0xde, 0xdc, 0xc0, 0x7c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x10, 0x38, 0x6c, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xfc, 0x66, 0x66, 0x66, 0x7c, 0x66, 0x66, 0x66, 0x66, 0xfc, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x3c, 0x66, 0xc2, 0xc0, 0xc0, 0xc0, 0xc0, 0xc2, 0x66, 0x3c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xf8, 0x6c, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x6c, 0xf8, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xfe, 0x66, 0x62, 0x68, 0x78, 0x68, 0x60, 0x62, 0x66, 0xfe, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xfe, 0x66, 0x62, 0x68, 0x78, 0x68, 0x60, 0x60, 0x60, 0xf0, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x3c, 0x66, 0xc2, 0xc0, 0xc0, 0xde, 0xc6, 0xc6, 0x66, 0x3a, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x3c, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x1e, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0xcc, 0xcc, 0xcc, 0x78, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xe6, 0x66, 0x66, 0x6c, 0x78, 0x78, 0x6c, 0x66, 0x66, 0xe6, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xf0, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x62, 0x66, 0xfe, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xc3, 0xe7, 0xff, 0xff, 0xdb, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xc6, 0xe6, 0xf6, 0xfe, 0xde, 0xce, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xfc, 0x66, 0x66, 0x66, 0x7c, 0x60, 0x60, 0x60, 0x60, 0xf0, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xd6, 0xde, 0x7c, 0x0c, 0x0e, 0x00, 0x00,
 0x00, 0x00, 0xfc, 0x66, 0x66, 0x66, 0x7c, 0x6c, 0x66, 0x66, 0x66, 0xe6, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0x60, 0x38, 0x0c, 0x06, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xff, 0xdb, 0x99, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0x66, 0x3c, 0x18, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xdb, 0xdb, 0xff, 0x66, 0x66, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xc3, 0xc3, 0x66, 0x3c, 0x18, 0x18, 0x3c, 0x66, 0xc3, 0xc3, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xc3, 0xc3, 0xc3, 0x66, 0x3c, 0x18, 0x18, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xff, 0xc3, 0x86, 0x0c, 0x18, 0x30, 0x60, 0xc1, 0xc3, 0xff, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x3c, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x3c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x80, 0xc0, 0xe0, 0x70, 0x38, 0x1c, 0x0e, 0x06, 0x02, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x3c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x3c, 0x00, 0x00, 0x00, 0x00,
 0x10, 0x38, 0x6c, 0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
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 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0xff, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
 0x18, 0x18, 0x18, 0x18, 0x18, 0xff, 0x18, 0xff, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0,
 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x76, 0xdc, 0xd8, 0xd8, 0xd8, 0xdc, 0x76, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x78, 0xcc, 0xcc, 0xcc, 0xd8, 0xcc, 0xc6, 0xc6, 0xc6, 0xcc, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0xfe, 0xc6, 0xc6, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0xfe, 0x6c, 0x6c, 0x6c, 0x6c, 0x6c, 0x6c, 0x6c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0xfe, 0xc6, 0x60, 0x30, 0x18, 0x30, 0x60, 0xc6, 0xfe, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0xd8, 0xd8, 0xd8, 0xd8, 0xd8, 0x70, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x66, 0x66, 0x66, 0x66, 0x66, 0x7c, 0x60, 0x60, 0xc0, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x76, 0xdc, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x7e, 0x18, 0x3c, 0x66, 0x66, 0x66, 0x3c, 0x18, 0x7e, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x38, 0x6c, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0x6c, 0x38, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x38, 0x6c, 0xc6, 0xc6, 0xc6, 0x6c, 0x6c, 0x6c, 0x6c, 0xee, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x1e, 0x30, 0x18, 0x0c, 0x3e, 0x66, 0x66, 0x66, 0x66, 0x3c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0xdb, 0xdb, 0xdb, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x03, 0x06, 0x7e, 0xdb, 0xdb, 0xf3, 0x7e, 0x60, 0xc0, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x1c, 0x30, 0x60, 0x60, 0x7c, 0x60, 0x60, 0x60, 0x30, 0x1c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0xfe, 0x00, 0x00, 0xfe, 0x00, 0x00, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x7e, 0x18, 0x18, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x30, 0x18, 0x0c, 0x06, 0x0c, 0x18, 0x30, 0x00, 0x7e, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x0c, 0x18, 0x30, 0x60, 0x30, 0x18, 0x0c, 0x00, 0x7e, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x0e, 0x1b, 0x1b, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0xd8, 0xd8, 0xd8, 0x70, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x7e, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x76, 0xdc, 0x00, 0x76, 0xdc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x38, 0x6c, 0x6c, 0x38, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x0f, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0xec, 0x6c, 0x6c, 0x3c, 0x1c, 0x00, 0x00, 0x00, 0x00,
 0x00, 0xd8, 0x6c, 0x6c, 0x6c, 0x6c, 0x6c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x70, 0xd8, 0x30, 0x60, 0xc8, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x7c, 0x7c, 0x7c, 0x7c, 0x7c, 0x7c, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

static void vga_initmode(VGAState *s)
{
    for (int i = 0; i < 64*3; i++)
        s->palette[i] = pal_ega[i];

    for (int i = 0; i <= 0x13; i++)
        s->ar[i] = actl[i];
    s->ar[0x14] = 0;

    s->sr[0] = 0x3;
    for (int i = 0; i < 4; i++)
        s->sr[i + 1] = sequ[i];

    for (int i = 0; i <= 8; i++)
        s->gr[i] = grdc[i];

    for (int i = 0; i <= 0x18; i++)
        s->cr[i] = crtc[i];

    s->msr = 0x67;

    // clear screen
    for (int i = 0; i < s->vga_ram_size / 4; i++) {
        s->vga_ram[i * 4] = 0x20;
        s->vga_ram[i * 4 + 1] = 0x07;
    }

    // load font
    for (int i = 0; i < 256; i++) {
        for (int j = 0; j < 16; j++) {
            s->vga_ram[i * 32 * 4 + j * 4 + 2] = vgafont16[i * 16 + j];
        }
    }

    s->ar_index = 0x20;
}