Changeset 9a63657 in mainline

Timestamp:

2008-12-27T11:29:11Z (16 years ago)

Author:

Jiri Svoboda <jirik.svoboda@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

24a44ec

Parents:

ac48fef

Message:

Revive kernel EGA fb driver. Plus fix bug — was using memcpy() for scrolling instead of memmove().

File:

• kernel/arch/ia32/src/drivers/ega.c (modified) (6 diffs)

kernel/arch/ia32/src/drivers/ega.c

@@ -39 +39 @@
 #include <mm/page.h>
 #include <mm/as.h>
+#include <mm/slab.h>
 #include <arch/mm/page.h>
 #include <synch/spinlock.h>
@@ -59 +60 @@
 static uint32_t ega_cursor;
 static uint8_t *videoram;
+static uint8_t *backbuf;
 
 static void ega_putchar(chardev_t *d, const char ch);
@@ -72 +74 @@
 {
         uint8_t hi, lo;
+
+        backbuf = (uint8_t *) malloc(SCREEN * 2, 0);
+        if (!backbuf)
+                panic("Unable to allocate backbuffer.\n");
         
         videoram = (uint8_t *) hw_map(VIDEORAM, SCREEN * 2);
@@ -99 +105 @@
 {
         videoram[ega_cursor * 2] = ch;
+        backbuf[ega_cursor * 2] = ch;
 }
 
@@ -109 +116 @@
                 return;
 
-        memcpy((void *) videoram, (void *) (videoram + ROW * 2), (SCREEN - ROW) * 2);
+        memmove((void *) videoram, (void *) (videoram + ROW * 2), (SCREEN - ROW) * 2);
+        memmove((void *) backbuf, (void *) (backbuf + ROW * 2), (SCREEN - ROW) * 2);
         memsetw(videoram + (SCREEN - ROW) * 2, ROW, 0x0720);
+        memsetw(backbuf + (SCREEN - ROW) * 2, ROW, 0x0720);
         ega_cursor = ega_cursor - ROW;
 }
@@ -152 +161 @@
 }
 
+void ega_redraw(void)
+{
+        memcpy(videoram, backbuf, SCREEN * 2);
+        ega_move_cursor();
+}
+
 /** @}
  */