1 files changed, 81 insertions, 0 deletions
diff --git a/sys/compat/x86bios/x86bios_alloc.c b/sys/compat/x86bios/x86bios_alloc.c
new file mode 100644
index 0000000..624a75c
--- /dev/null
+++ b/sys/compat/x86bios/x86bios_alloc.c
@@ -0,0 +1,81 @@
+/*-
+ * Copyright (C) 1999 Egbert Eich
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and that
+ * both that copyright notice and this permission notice appear in
+ * supporting documentation, and that the name of the authors not be used
+ * in advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission.  The authors makes no
+ * representations about the suitability of this software for any purpose.
+ * It is provided "as is" without express or implied warranty.
+ *
+ * THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
+ * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ *
+ * xserver/hw/xfree86/int10/generic.c
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+
+#include <compat/x86bios/x86bios.h>
+
+extern u_char *pbiosMem;
+extern int busySegMap[5];
+
+void *
+x86biosAlloc(int count, int *segs)
+{
+	int i;
+	int j;
+
+	/* find the free segblock of page */
+	for (i = 0; i < (PAGE_RESERV - count); i++)
+	{
+		if (busySegMap[i] == 0)
+		{
+			/* find the capacity of segblock */
+			for (j = i; j < (i + count); j++)
+			{
+				if (busySegMap[j] == 1)
+					break;
+			}
+
+			if (j == (i + count))
+				break;
+			i += count;
+		}
+	}
+
+	if (i == (PAGE_RESERV - count))
+		return NULL;
+
+	/* make the segblock is used */
+	for (j = i; j < (i + count); j++)
+		busySegMap[i] = 1;
+
+	*segs = i * 4096;
+
+	return (pbiosMem + *segs);
+}
+
+void
+x86biosFree(void *pbuf, int count)
+{
+	int i;
+	int busySeg;
+
+	busySeg = ((u_char *)pbuf - pbiosMem) / 4096;
+
+	for (i = busySeg; i < (busySeg + count); i++)
+		busySegMap[i] = 0;
+}