intel_reg_dumper: Add support for reading register dumps from files

Also add intel_reg_snapshot for creating such snapshots, and relevant
documentation.

Signed-off-by: Adam Jackson <ajax@redhat.com>

tools/Makefile.am

@@ -10,6 +10,7 @@ bin_PROGRAMS = \
 	intel_lid \
 	intel_stepping \
 	intel_reg_dumper \
+	intel_reg_snapshot \
 	intel_reg_write \
 	intel_reg_read
 

tools/intel_reg_dumper.c

@@ -1658,9 +1658,12 @@ intel_dump_regs(void)
 
 int main(int argc, char** argv)
 {
-	intel_get_mmio();
+	if (argc == 2)
+		intel_map_file(argv[1]);
+	else
+		intel_get_mmio();
 
-	if (HAS_PCH_SPLIT(devid))
+	if (HAS_PCH_SPLIT(devid) || getenv("HAS_PCH_SPLIT"))
 		ironlake_dump_regs();
 	else
 		intel_dump_regs();

tools/intel_reg_snapshot.c

@@ -0,0 +1,44 @@
+/*
+ * Copyright © 2010 Red Hat, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Authors:
+ *	Adam Jackson <ajax@redhat.com>
+ */
+
+#include <unistd.h>
+#include "intel_gpu_tools.h"
+
+int main(int argc, char** argv)
+{
+	int mmio_bar;
+
+	intel_get_mmio();
+
+	if (IS_9XX(devid))
+		mmio_bar = 0;
+	else
+		mmio_bar = 1;
+
+	write(1, mmio, pci_dev->regions[mmio_bar].size);
+
+	return 0;
+}