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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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 */
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/** @addtogroup genarch_drivers
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/** @addtogroup genarch_drivers
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 * @{
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 * @{
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 */
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 */
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/**
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/**
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 * @file
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 * @file
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 * @brief EGA driver.
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 * @brief EGA driver.
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/*
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/*
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 * This function takes care of scrolling.
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 * This function takes care of scrolling.
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 */
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 */
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static void ega_check_cursor(void)
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static void ega_check_cursor(void)
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{
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{
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    if (ega_cursor < SCREEN)
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    if (ega_cursor < EGA_SCREEN)
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        return;
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        return;
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    memmove((void *) videoram, (void *) (videoram + ROW * 2),
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    memmove((void *) videoram, (void *) (videoram + EGA_COLS * 2),
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        (SCREEN - ROW) * 2);
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        (EGA_SCREEN - EGA_COLS) * 2);
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    memmove((void *) backbuf, (void *) (backbuf + ROW * 2),
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    memmove((void *) backbuf, (void *) (backbuf + EGA_COLS * 2),
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        (SCREEN - ROW) * 2);
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        (EGA_SCREEN - EGA_COLS) * 2);
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    memsetw(videoram + (SCREEN - ROW) * 2, ROW, 0x0720);
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    memsetw(videoram + (EGA_SCREEN - EGA_COLS) * 2, EGA_COLS, 0x0720);
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    memsetw(backbuf + (SCREEN - ROW) * 2, ROW, 0x0720);
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    memsetw(backbuf + (EGA_SCREEN - EGA_COLS) * 2, EGA_COLS, 0x0720);
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    ega_cursor = ega_cursor - ROW;
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    ega_cursor = ega_cursor - EGA_COLS;
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}
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}
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static void ega_move_cursor(void)
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static void ega_move_cursor(void)
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{
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{
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    pio_write_8(ega_base + EGA_INDEX_REG, 0xe);
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    pio_write_8(ega_base + EGA_INDEX_REG, 0xe);
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    pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) ((ega_cursor >> 8) & 0xff));
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    pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) ((ega_cursor >> 8) & 0xff));
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    pio_write_8(ega_base + EGA_INDEX_REG, 0xf);
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    pio_write_8(ega_base + EGA_INDEX_REG, 0xf);
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    pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) (ega_cursor & 0xff));   
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    pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) (ega_cursor & 0xff));
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}
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}
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static void ega_display_char(char ch, bool silent)
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static void ega_display_char(char ch, bool silent)
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{
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{
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    backbuf[ega_cursor * 2] = ch;
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    backbuf[ega_cursor * 2] = ch;
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    ipl = interrupts_disable();
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    ipl = interrupts_disable();
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    spinlock_lock(&egalock);
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    spinlock_lock(&egalock);
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    switch (ch) {
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    switch (ch) {
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    case '\n':
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    case '\n':
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        ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
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        ega_cursor = (ega_cursor + EGA_COLS) - ega_cursor % EGA_COLS;
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        break;
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        break;
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    case '\t':
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    case '\t':
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        ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
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        ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
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        break;
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        break;
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    case '\b':
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    case '\b':
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        if (ega_cursor % ROW)
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        if (ega_cursor % EGA_COLS)
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            ega_cursor--;
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            ega_cursor--;
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        break;
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        break;
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    default:
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    default:
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        ega_display_char(ch, silent);
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        ega_display_char(ch, silent);
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        ega_cursor++;
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        ega_cursor++;
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    .write = ega_putchar
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    .write = ega_putchar
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};
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};
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void ega_init(ioport8_t *base, uintptr_t videoram_phys)
 134 
void ega_init(ioport8_t *base, uintptr_t videoram_phys)
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{
 135 
{
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    /* Initialize the software structure. */   
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    /* Initialize the software structure. */
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    ega_base = base;
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    ega_base = base;
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 138 
   
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    backbuf = (uint8_t *) malloc(SCREEN * 2, 0);
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    backbuf = (uint8_t *) malloc(EGA_VRAM_SIZE, 0);
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    if (!backbuf)
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    if (!backbuf)
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        panic("Unable to allocate backbuffer.");
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        panic("Unable to allocate backbuffer.");
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    videoram = (uint8_t *) hw_map(videoram_phys, SCREEN * 2);
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    videoram = (uint8_t *) hw_map(videoram_phys, EGA_VRAM_SIZE);
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    /* Clear the screen and set the cursor position. */
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    /* Clear the screen and set the cursor position. */
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    memsetw(videoram, SCREEN, 0x0720);
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    memsetw(videoram, EGA_SCREEN, 0x0720);
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    memsetw(backbuf, SCREEN, 0x0720);
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    memsetw(backbuf, EGA_SCREEN, 0x0720);
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    ega_move_cursor();
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    ega_move_cursor();
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 149 
   
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    chardev_initialize("ega_out", &ega_console, &ega_ops);
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    chardev_initialize("ega_out", &ega_console, &ega_ops);
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    stdout = &ega_console;
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    stdout = &ega_console;
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 152 
   
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    sysinfo_set_item_val("fb", NULL, true);
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    sysinfo_set_item_val("fb", NULL, true);
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    sysinfo_set_item_val("fb.kind", NULL, 2);
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    sysinfo_set_item_val("fb.kind", NULL, 2);
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    sysinfo_set_item_val("fb.width", NULL, ROW);
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    sysinfo_set_item_val("fb.width", NULL, EGA_COLS);
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    sysinfo_set_item_val("fb.height", NULL, ROWS);
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    sysinfo_set_item_val("fb.height", NULL, EGA_ROWS);
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    sysinfo_set_item_val("fb.blinking", NULL, true);
 157 
    sysinfo_set_item_val("fb.blinking", NULL, true);
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    sysinfo_set_item_val("fb.address.physical", NULL, videoram_phys);
 158 
    sysinfo_set_item_val("fb.address.physical", NULL, videoram_phys);
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}
 159 
}
160 
 
 160 
 
161 
void ega_redraw(void)
 161 
void ega_redraw(void)
162 
{
 162 
{
163 
    memcpy(videoram, backbuf, SCREEN * 2);
 163 
    memcpy(videoram, backbuf, EGA_VRAM_SIZE);
164 
    ega_move_cursor();
 164 
    ega_move_cursor();
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}
 165 
}
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 166 
 
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/** @}
 167 
/** @}
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 */
 168 
 */