1 files changed, 141 insertions, 0 deletions
diff --git a/hw/xfree86/os-support/shared/bios_mmap.c b/hw/xfree86/os-support/shared/bios_mmap.c
new file mode 100644
index 0000000..33a8df0
--- /dev/null
+++ b/hw/xfree86/os-support/shared/bios_mmap.c
@@ -0,0 +1,141 @@
+/*
+ * Copyright 1993 by David Wexelblat <dwex@goblin.org>
+ *
+ * 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 David Wexelblat not be used in
+ * advertising or publicity pertaining to distribution of the software without
+ * specific, written prior permission.  David Wexelblat makes no representations
+ * about the suitability of this software for any purpose.  It is provided
+ * "as is" without express or implied warranty.
+ *
+ * DAVID WEXELBLAT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL DAVID WEXELBLAT 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.
+ *
+ */
+
+#ifdef HAVE_XORG_CONFIG_H
+#include <xorg-config.h>
+#endif
+
+#include <X11/X.h>
+
+#include "xf86.h"
+#include "xf86Priv.h"
+#include "xf86_OSlib.h"
+
+#ifndef MAP_FAILED
+#define MAP_FAILED ((void *)-1)
+#endif
+
+/*
+ * Read BIOS via mmap()ing DEV_MEM
+ */
+
+#ifndef __alpha__
+int
+xf86ReadBIOS(unsigned long Base, unsigned long Offset, unsigned char *Buf,
+	     int Len)
+{
+	int fd;
+	unsigned char *ptr;
+	int psize;
+	int mlen;
+
+	if ((fd = open(DEV_MEM, O_RDONLY)) < 0)
+	{
+		xf86Msg(X_WARNING, "xf86ReadBIOS: Failed to open %s (%s)\n",
+			DEV_MEM, strerror(errno));
+		return -1;
+	}
+	psize = getpagesize();
+	Offset += Base & (psize - 1);
+	Base &= ~(psize - 1);
+	mlen = (Offset + Len + psize - 1) & ~(psize - 1);
+	ptr = (unsigned char *)mmap((caddr_t)0, mlen, PROT_READ,
+					MAP_SHARED, fd, (off_t)Base);
+	if (ptr == MAP_FAILED)
+	{
+		xf86Msg(X_WARNING, "xf86ReadBIOS: %s mmap failed (%s)\n",
+			DEV_MEM, strerror(errno));
+		close(fd);
+		return -1;
+	}
+	DebugF("xf86ReadBIOS: BIOS at 0x%08x has signature 0x%04x\n",
+		Base, ptr[0] | (ptr[1] << 8));
+	(void)memcpy(Buf, (void *)(ptr + Offset), Len);
+	(void)munmap((caddr_t)ptr, mlen);
+	(void)close(fd);
+	return Len;
+}
+
+#else /* __alpha__ */
+
+  /*
+   *  We trick "mmap" into mapping BUS memory for us via BUS_BASE,
+   *  which is the KSEG address of the start of the DENSE memory
+   *  area.
+   */
+
+  /*
+   * NOTE: there prolly ought to be more validity checks and all
+   *  re: boundaries and sizes and such...
+   */
+
+#ifdef linux
+
+extern unsigned long _bus_base(void);
+#define BUS_BASE _bus_base()
+
+#else
+
+extern u_int64_t dense_base(void);
+#define BUS_BASE dense_base()
+
+#endif
+
+int
+xf86ReadBIOS(unsigned long Base, unsigned long Offset, unsigned char *Buf,
+	     int Len)
+{
+	caddr_t base;
+ 	int fd;
+	int psize;
+	int mlen;
+
+	if ((fd = open(DEV_MEM, O_RDONLY)) < 0)
+	{
+		xf86Msg(X_WARNING, "xf86ReadBIOS: Failed to open %s (%s)\n",
+			DEV_MEM, strerror(errno));
+		return -1;
+	}
+
+	psize = getpagesize();
+	Offset += Base & (psize - 1);
+	Base &= ~(psize - 1);
+	mlen = (Offset + Len + psize - 1) & ~(psize - 1);
+	base = mmap((caddr_t)0, mlen, PROT_READ,
+		    MAP_SHARED, fd, (off_t)(Base + BUS_BASE));
+
+	if (base == MAP_FAILED)
+	{
+		xf86Msg(X_WARNING, "xf86ReadBIOS: Failed to mmap %s (%s)\n",
+			DEV_MEM, strerror(errno));
+		return -1;
+	}
+
+	xf86SlowBCopyFromBus((unsigned char *)(base+Offset), Buf, Len);
+
+	munmap((caddr_t)base, mlen);
+	close(fd);
+	return Len;
+}
+
+#endif /* __alpha__ */