WebSVN – HelenOS – Diff – /branches/dynload/kernel/genarch/src/drivers/ega/ega.c

 /*
  * Copyright (c) 2001-2004 Jakub Jermar
  * All rights reserved.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
+ *
  * - Redistributions of source code must retain the above copyright
  *   notice, this list of conditions and the following disclaimer.
  * - Redistributions in binary form must reproduce the above copyright
  *   notice, this list of conditions and the following disclaimer in the
  *   documentation and/or other materials provided with the distribution.
  * - The name of the author may not be used to endorse or promote products
  *   derived from this software without specific prior written permission.
+ *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 /** @addtogroup genarch_drivers
  * @{
  */
 /**
  * @file
  * @brief EGA driver.
  */
 #include <genarch/drivers/ega/ega.h>
 #include <putchar.h>
 #include <mm/page.h>
 #include <mm/as.h>
 #include <mm/slab.h>
 #include <arch/mm/page.h>
 #include <synch/spinlock.h>
 #include <arch/types.h>
 #include <arch/asm.h>
 #include <memstr.h>
 #include <console/chardev.h>
 #include <console/console.h>
 #include <sysinfo/sysinfo.h>
 #include <ddi/ddi.h>
 /*
  * The EGA driver.
  * Simple and short. Function for displaying characters and "scrolling".
  */
 SPINLOCK_INITIALIZE(egalock);
 static uint32_t ega_cursor;
 static uint8_t *videoram;
 static uint8_t *backbuf;
-static ioport_t ega_base;
+static ioport8_t *ega_base;
 chardev_t ega_console;
 /*
  * This function takes care of scrolling.
  */
 static void ega_check_cursor(void)
+{
-    if (ega_cursor < SCREEN)
+    if (ega_cursor < EGA_SCREEN)
         return;
-    memmove((void *) videoram, (void *) (videoram + ROW * 2),
+    memmove((void *) videoram, (void *) (videoram + EGA_COLS * 2),
-        (SCREEN - ROW) * 2);
+        (EGA_SCREEN - EGA_COLS) * 2);
-    memmove((void *) backbuf, (void *) (backbuf + ROW * 2),
+    memmove((void *) backbuf, (void *) (backbuf + EGA_COLS * 2),
-        (SCREEN - ROW) * 2);
+        (EGA_SCREEN - EGA_COLS) * 2);
-    memsetw(videoram + (SCREEN - ROW) * 2, ROW, 0x0720);
+    memsetw(videoram + (EGA_SCREEN - EGA_COLS) * 2, EGA_COLS, 0x0720);
-    memsetw(backbuf + (SCREEN - ROW) * 2, ROW, 0x0720);
+    memsetw(backbuf + (EGA_SCREEN - EGA_COLS) * 2, EGA_COLS, 0x0720);
-    ega_cursor = ega_cursor - ROW;
+    ega_cursor = ega_cursor - EGA_COLS;
+}
+static void ega_show_cursor(void)
+{
+    pio_write_8(ega_base + EGA_INDEX_REG, 0x0a);
+    uint8_t stat = pio_read_8(ega_base + EGA_DATA_REG);
+    pio_write_8(ega_base + EGA_INDEX_REG, 0x0a);
+    pio_write_8(ega_base + EGA_DATA_REG, stat & (~(1 << 5)));
+}
 static void ega_move_cursor(void)
+{
-    pio_write_8(ega_base + EGA_INDEX_REG, 0xe);
+    pio_write_8(ega_base + EGA_INDEX_REG, 0x0e);
     pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) ((ega_cursor >> 8) & 0xff));
-    pio_write_8(ega_base + EGA_INDEX_REG, 0xf);
+    pio_write_8(ega_base + EGA_INDEX_REG, 0x0f);
     pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) (ega_cursor & 0xff));
+}
+static void ega_sync_cursor(void)
+{
+    pio_write_8(ega_base + EGA_INDEX_REG, 0x0e);
+    uint8_t hi = pio_read_8(ega_base + EGA_DATA_REG);
+    pio_write_8(ega_base + EGA_INDEX_REG, 0x0f);
+    uint8_t lo = pio_read_8(ega_base + EGA_DATA_REG);
+    ega_cursor = (hi << 8) | lo;
+    if ((ega_cursor % EGA_COLS) != 0)
+        ega_cursor = (ega_cursor + EGA_COLS) - ega_cursor % EGA_COLS;
+    ega_check_cursor();
+    ega_move_cursor();
+    ega_show_cursor();
+}
 static void ega_display_char(char ch, bool silent)
+{
     backbuf[ega_cursor * 2] = ch;
     if (!silent)
         videoram[ega_cursor * 2] = ch;
+}
 static void ega_putchar(chardev_t *d __attribute__((unused)), const char ch, bool silent)
+{
     ipl_t ipl;
     ipl = interrupts_disable();
     spinlock_lock(&egalock);
     switch (ch) {
     case '\n':
-        ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
+        ega_cursor = (ega_cursor + EGA_COLS) - ega_cursor % EGA_COLS;
         break;
     case '\t':
         ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
         break;
     case '\b':
-        if (ega_cursor % ROW)
+        if (ega_cursor % EGA_COLS)
             ega_cursor--;
         break;
     default:
         ega_display_char(ch, silent);
         ega_cursor++;
         break;
+    }
     ega_check_cursor();
     if (!silent)
         ega_move_cursor();
     spinlock_unlock(&egalock);
     interrupts_restore(ipl);
+}
 static chardev_operations_t ega_ops = {
     .write = ega_putchar
 };
-void ega_init(ioport_t base, uintptr_t videoram_phys)
+void ega_init(ioport8_t *base, uintptr_t videoram_phys)
+{
     /* Initialize the software structure. */
     ega_base = base;
-    backbuf = (uint8_t *) malloc(SCREEN * 2, 0);
+    backbuf = (uint8_t *) malloc(EGA_VRAM_SIZE, 0);
     if (!backbuf)
         panic("Unable to allocate backbuffer.");
-    videoram = (uint8_t *) hw_map(videoram_phys, SCREEN * 2);
+    videoram = (uint8_t *) hw_map(videoram_phys, EGA_VRAM_SIZE);
-    /* Clear the screen and set the cursor position. */
+    /* Synchronize the back buffer and cursor position. */
-    memsetw(videoram, SCREEN, 0x0720);
-    memsetw(backbuf, SCREEN, 0x0720);
+    memcpy(backbuf, videoram, EGA_VRAM_SIZE);
-    ega_move_cursor();
+    ega_sync_cursor();
     chardev_initialize("ega_out", &ega_console, &ega_ops);
     stdout = &ega_console;
     sysinfo_set_item_val("fb", NULL, true);
     sysinfo_set_item_val("fb.kind", NULL, 2);
-    sysinfo_set_item_val("fb.width", NULL, ROW);
+    sysinfo_set_item_val("fb.width", NULL, EGA_COLS);
-    sysinfo_set_item_val("fb.height", NULL, ROWS);
+    sysinfo_set_item_val("fb.height", NULL, EGA_ROWS);
     sysinfo_set_item_val("fb.blinking", NULL, true);
     sysinfo_set_item_val("fb.address.physical", NULL, videoram_phys);
+}
 void ega_redraw(void)
+{
-    memcpy(videoram, backbuf, SCREEN * 2);
+    memcpy(videoram, backbuf, EGA_VRAM_SIZE);
     ega_move_cursor();
+    ega_show_cursor();
+}
 /** @}
  */

Subversion Repositories HelenOS

(root)/branches/dynload/kernel/genarch/src/drivers/ega/ega.c @ 4345 – Rev 4343 → 4344