assembler: Introduce struct brw_context

A lot of the mesa code use struct brw_context to get the GPU generation
and various information. Let's stub this structure and initialize it
ourselves to be able to resuse mesa's code untouched.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>

assembler/brw_context.c

@@ -0,0 +1,44 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * 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.
+ */
+
+#include <string.h>
+
+#include "brw_context.h"
+
+static bool
+intel_init_context(struct intel_context *intel, int gen)
+{
+   memset(intel, 0, sizeof(struct intel_context));
+   intel->gen = gen / 10;
+   intel->is_haswell = gen == 75;
+   if (intel->gen >= 5)
+      intel->needs_ff_sync = true;
+
+   return true;
+}
+
+bool
+brw_init_context(struct brw_context *brw, int gen)
+{
+   return intel_init_context(&brw->intel, gen);
+}