exec: Extract 'page-vary.h' header

In the next commit we will extract the generic code out of
page-vary.c, only keeping the target specific code. Both
files will use the same TargetPageBits structure, so make
its declaration in a shared header.

As the common header can not use target specific types,
use a uint64_t to hold the page mask value, and add a
cast back to target_long in the TARGET_PAGE_MASK definitions.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210322112427.4045204-3-f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/exec/cpu-all.h

@@ -215,11 +215,7 @@ static inline void stl_phys_notdirty(AddressSpace *as, hwaddr addr, uint32_t val
 /* page related stuff */
 
 #ifdef TARGET_PAGE_BITS_VARY
-typedef struct {
-    bool decided;
-    int bits;
-    target_long mask;
-} TargetPageBits;
+# include "exec/page-vary.h"
 #if defined(CONFIG_ATTRIBUTE_ALIAS) || !defined(IN_EXEC_VARY)
 extern const TargetPageBits target_page;
 #else
@@ -227,10 +223,11 @@ extern TargetPageBits target_page;
 #endif
 #ifdef CONFIG_DEBUG_TCG
 #define TARGET_PAGE_BITS   ({ assert(target_page.decided); target_page.bits; })
-#define TARGET_PAGE_MASK   ({ assert(target_page.decided); target_page.mask; })
+#define TARGET_PAGE_MASK   ({ assert(target_page.decided); \
+                              (target_long)target_page.mask; })
 #else
 #define TARGET_PAGE_BITS   target_page.bits
-#define TARGET_PAGE_MASK   target_page.mask
+#define TARGET_PAGE_MASK   ((target_long)target_page.mask)
 #endif
 #define TARGET_PAGE_SIZE   (-(int)TARGET_PAGE_MASK)
 #else

include/exec/page-vary.h

+/*
+ * Definitions for cpus with variable page sizes.
+ *
+ *  Copyright (c) 2003 Fabrice Bellard
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef EXEC_PAGE_VARY_H
+#define EXEC_PAGE_VARY_H
+
+typedef struct {
+    bool decided;
+    int bits;
+    uint64_t mask;
+} TargetPageBits;
+
+#endif /* EXEC_PAGE_VARY_H */