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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 24 
 * 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
 25 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 26 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
 27 
 */
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 28 
 
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/** @addtogroup genarch_drivers
 29 
/** @addtogroup genarch_drivers
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 * @{
 30 
 * @{
31 
 */
 31 
 */
32 
/**
 32 
/**
33 
 * @file
 33 
 * @file
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 * @brief EGA driver.
 34 
 * @brief EGA driver.
Line 56... Line 56...
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 56 
 
57 
SPINLOCK_INITIALIZE(egalock);
 57 
SPINLOCK_INITIALIZE(egalock);
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static uint32_t ega_cursor;
 58 
static uint32_t ega_cursor;
59 
static uint8_t *videoram;
 59 
static uint8_t *videoram;
60 
static uint8_t *backbuf;
 60 
static uint8_t *backbuf;
61 
static ioport_t ega_base;
 61 
static ioport8_t *ega_base;
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 62 
 
63 
chardev_t ega_console;
 63 
chardev_t ega_console;
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 64 
 
65 
/*
 65 
/*
66 
 * This function takes care of scrolling.
 66 
 * This function takes care of scrolling.
67 
 */
 67 
 */
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static void ega_check_cursor(void)
 68 
static void ega_check_cursor(void)
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{
 69 
{
70 
    if (ega_cursor < SCREEN)
 70 
    if (ega_cursor < EGA_SCREEN)
71 
        return;
 71 
        return;
72 
 
 72 
 
73 
    memmove((void *) videoram, (void *) (videoram + ROW * 2),
 73 
    memmove((void *) videoram, (void *) (videoram + EGA_COLS * 2),
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        (SCREEN - ROW) * 2);
 74 
        (EGA_SCREEN - EGA_COLS) * 2);
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    memmove((void *) backbuf, (void *) (backbuf + ROW * 2),
 75 
    memmove((void *) backbuf, (void *) (backbuf + EGA_COLS * 2),
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        (SCREEN - ROW) * 2);
 76 
        (EGA_SCREEN - EGA_COLS) * 2);
77 
    memsetw(videoram + (SCREEN - ROW) * 2, ROW, 0x0720);
 77 
    memsetw(videoram + (EGA_SCREEN - EGA_COLS) * 2, EGA_COLS, 0x0720);
78 
    memsetw(backbuf + (SCREEN - ROW) * 2, ROW, 0x0720);
 78 
    memsetw(backbuf + (EGA_SCREEN - EGA_COLS) * 2, EGA_COLS, 0x0720);
79 
    ega_cursor = ega_cursor - ROW;
 79 
    ega_cursor = ega_cursor - EGA_COLS;
- 
 
 80 
}
- 
 
 81 
 
- 
 
 82 
static void ega_show_cursor(void)
- 
 
 83 
{
- 
 
 84 
    pio_write_8(ega_base + EGA_INDEX_REG, 0x0a);
- 
 
 85 
    uint8_t stat = pio_read_8(ega_base + EGA_DATA_REG);
- 
 
 86 
    pio_write_8(ega_base + EGA_INDEX_REG, 0x0a);
- 
 
 87 
    pio_write_8(ega_base + EGA_DATA_REG, stat & (~(1 << 5)));
80 
}
 88 
}
81 
 
 89 
 
82 
static void ega_move_cursor(void)
 90 
static void ega_move_cursor(void)
83 
{
 91 
{
84 
    pio_write_8(ega_base + EGA_INDEX_REG, 0xe);
 92 
    pio_write_8(ega_base + EGA_INDEX_REG, 0x0e);
85 
    pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) ((ega_cursor >> 8) & 0xff));
 93 
    pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) ((ega_cursor >> 8) & 0xff));
86 
    pio_write_8(ega_base + EGA_INDEX_REG, 0xf);
 94 
    pio_write_8(ega_base + EGA_INDEX_REG, 0x0f);
87 
    pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) (ega_cursor & 0xff));   
 95 
    pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) (ega_cursor & 0xff));
- 
 
 96 
}
- 
 
 97 
 
- 
 
 98 
static void ega_sync_cursor(void)
- 
 
 99 
{
- 
 
 100 
    pio_write_8(ega_base + EGA_INDEX_REG, 0x0e);
- 
 
 101 
    uint8_t hi = pio_read_8(ega_base + EGA_DATA_REG);
- 
 
 102 
    pio_write_8(ega_base + EGA_INDEX_REG, 0x0f);
- 
 
 103 
    uint8_t lo = pio_read_8(ega_base + EGA_DATA_REG);
- 
 
 104 
   
- 
 
 105 
    ega_cursor = (hi << 8) | lo;
- 
 
 106 
    if ((ega_cursor % EGA_COLS) != 0)
- 
 
 107 
        ega_cursor = (ega_cursor + EGA_COLS) - ega_cursor % EGA_COLS;
- 
 
 108 
   
- 
 
 109 
    ega_check_cursor();
- 
 
 110 
    ega_move_cursor();
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 111 
    ega_show_cursor();
88 
}
 112 
}
89 
 
 113 
 
90 
static void ega_display_char(char ch, bool silent)
 114 
static void ega_display_char(char ch, bool silent)
91 
{
 115 
{
92 
    backbuf[ega_cursor * 2] = ch;
 116 
    backbuf[ega_cursor * 2] = ch;
Line 102... Line 126...
102 
    ipl = interrupts_disable();
 126 
    ipl = interrupts_disable();
103 
    spinlock_lock(&egalock);
 127 
    spinlock_lock(&egalock);
104 
   
 128 
   
105 
    switch (ch) {
 129 
    switch (ch) {
106 
    case '\n':
 130 
    case '\n':
107 
        ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
 131 
        ega_cursor = (ega_cursor + EGA_COLS) - ega_cursor % EGA_COLS;
108 
        break;
 132 
        break;
109 
    case '\t':
 133 
    case '\t':
110 
        ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
 134 
        ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
111 
        break;
 135 
        break;
112 
    case '\b':
 136 
    case '\b':
113 
        if (ega_cursor % ROW)
 137 
        if (ega_cursor % EGA_COLS)
114 
            ega_cursor--;
 138 
            ega_cursor--;
115 
        break;
 139 
        break;
116 
    default:
 140 
    default:
117 
        ega_display_char(ch, silent);
 141 
        ega_display_char(ch, silent);
118 
        ega_cursor++;
 142 
        ega_cursor++;
Line 129... Line 153...
129 
 
 153 
 
130 
static chardev_operations_t ega_ops = {
 154 
static chardev_operations_t ega_ops = {
131 
    .write = ega_putchar
 155 
    .write = ega_putchar
132 
};
 156 
};
133 
 
 157 
 
134 
void ega_init(ioport_t base, uintptr_t videoram_phys)
 158 
void ega_init(ioport8_t *base, uintptr_t videoram_phys)
135 
{
 159 
{
136 
    /* Initialize the software structure. */   
 160 
    /* Initialize the software structure. */
137 
    ega_base = base;
 161 
    ega_base = base;
138 
   
 162 
   
139 
    backbuf = (uint8_t *) malloc(SCREEN * 2, 0);
 163 
    backbuf = (uint8_t *) malloc(EGA_VRAM_SIZE, 0);
140 
    if (!backbuf)
 164 
    if (!backbuf)
141 
        panic("Unable to allocate backbuffer.");
 165 
        panic("Unable to allocate backbuffer.");
142 
   
 166 
   
143 
    videoram = (uint8_t *) hw_map(videoram_phys, SCREEN * 2);
 167 
    videoram = (uint8_t *) hw_map(videoram_phys, EGA_VRAM_SIZE);
144 
   
 168 
   
145 
    /* Clear the screen and set the cursor position. */
 169 
    /* Synchronize the back buffer and cursor position. */
146 
    memsetw(videoram, SCREEN, 0x0720);
 - 
 
147 
    memsetw(backbuf, SCREEN, 0x0720);
 170 
    memcpy(backbuf, videoram, EGA_VRAM_SIZE);
148 
    ega_move_cursor();
 171 
    ega_sync_cursor();
149 
   
 172 
   
150 
    chardev_initialize("ega_out", &ega_console, &ega_ops);
 173 
    chardev_initialize("ega_out", &ega_console, &ega_ops);
151 
    stdout = &ega_console;
 174 
    stdout = &ega_console;
152 
   
 175 
   
153 
    sysinfo_set_item_val("fb", NULL, true);
 176 
    sysinfo_set_item_val("fb", NULL, true);
154 
    sysinfo_set_item_val("fb.kind", NULL, 2);
 177 
    sysinfo_set_item_val("fb.kind", NULL, 2);
155 
    sysinfo_set_item_val("fb.width", NULL, ROW);
 178 
    sysinfo_set_item_val("fb.width", NULL, EGA_COLS);
156 
    sysinfo_set_item_val("fb.height", NULL, ROWS);
 179 
    sysinfo_set_item_val("fb.height", NULL, EGA_ROWS);
157 
    sysinfo_set_item_val("fb.blinking", NULL, true);
 180 
    sysinfo_set_item_val("fb.blinking", NULL, true);
158 
    sysinfo_set_item_val("fb.address.physical", NULL, videoram_phys);
 181 
    sysinfo_set_item_val("fb.address.physical", NULL, videoram_phys);
159 
}
 182 
}
160 
 
 183 
 
161 
void ega_redraw(void)
 184 
void ega_redraw(void)
162 
{
 185 
{
163 
    memcpy(videoram, backbuf, SCREEN * 2);
 186 
    memcpy(videoram, backbuf, EGA_VRAM_SIZE);
164 
    ega_move_cursor();
 187 
    ega_move_cursor();
- 
 
 188 
    ega_show_cursor();
165 
}
 189 
}
166 
 
 190 
 
167 
/** @}
 191 
/** @}
168 
 */
 192 
 */