S: Maintained
F: softmmu/cpus.c
F: cpus-common.c
+F: page-vary.c
F: accel/tcg/
F: accel/stubs/tcg-stub.c
F: util/cacheinfo.c
+++ /dev/null
-/*
- * Variable page size handling
- *
- * 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/>.
- */
-
-#include "qemu/osdep.h"
-#include "qemu-common.h"
-
-#define IN_EXEC_VARY 1
-
-#include "exec/exec-all.h"
-
-#ifdef TARGET_PAGE_BITS_VARY
-# ifdef CONFIG_ATTRIBUTE_ALIAS
-/*
- * We want to declare the "target_page" variable as const, which tells
- * the compiler that it can cache any value that it reads across calls.
- * This avoids multiple assertions and multiple reads within any one user.
- *
- * This works because we finish initializing the data before we ever read
- * from the "target_page" symbol.
- *
- * This also requires that we have a non-constant symbol by which we can
- * perform the actual initialization, and which forces the data to be
- * allocated within writable memory. Thus "init_target_page", and we use
- * that symbol exclusively in the two functions that initialize this value.
- *
- * The "target_page" symbol is created as an alias of "init_target_page".
- */
-static TargetPageBits init_target_page;
-
-/*
- * Note that this is *not* a redundant decl, this is the definition of
- * the "target_page" symbol. The syntax for this definition requires
- * the use of the extern keyword. This seems to be a GCC bug in
- * either the syntax for the alias attribute or in -Wredundant-decls.
- *
- * See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91765
- */
-# pragma GCC diagnostic push
-# pragma GCC diagnostic ignored "-Wredundant-decls"
-
-extern const TargetPageBits target_page
- __attribute__((alias("init_target_page")));
-
-# pragma GCC diagnostic pop
-# else
-/*
- * When aliases are not supported then we force two different declarations,
- * by way of suppressing the header declaration with IN_EXEC_VARY.
- * We assume that on such an old compiler, LTO cannot be used, and so the
- * compiler cannot not detect the mismatched declarations, and all is well.
- */
-TargetPageBits target_page;
-# define init_target_page target_page
-# endif
-#endif
-
-bool set_preferred_target_page_bits(int bits)
-{
- /*
- * The target page size is the lowest common denominator for all
- * the CPUs in the system, so we can only make it smaller, never
- * larger. And we can't make it smaller once we've committed to
- * a particular size.
- */
-#ifdef TARGET_PAGE_BITS_VARY
- assert(bits >= TARGET_PAGE_BITS_MIN);
- if (init_target_page.bits == 0 || init_target_page.bits > bits) {
- if (init_target_page.decided) {
- return false;
- }
- init_target_page.bits = bits;
- }
-#endif
- return true;
-}
-
-void finalize_target_page_bits(void)
-{
-#ifdef TARGET_PAGE_BITS_VARY
- if (init_target_page.bits == 0) {
- init_target_page.bits = TARGET_PAGE_BITS_MIN;
- }
- init_target_page.mask = (target_long)-1 << init_target_page.bits;
- init_target_page.decided = true;
-
- /*
- * For the benefit of an -flto build, prevent the compiler from
- * hoisting a read from target_page before we finish initializing.
- */
- barrier();
-#endif
-}
common_ss.add(capstone)
specific_ss.add(files('cpu.c', 'disas.c', 'gdbstub.c'), capstone)
-specific_ss.add(files('exec-vary.c'))
specific_ss.add(when: 'CONFIG_TCG', if_true: files(
'fpu/softfloat.c',
'tcg/optimize.c',
))
specific_ss.add(when: 'CONFIG_TCG_INTERPRETER', if_true: files('tcg/tci.c'))
+specific_ss.add(files('page-vary.c'))
+
subdir('backends')
subdir('disas')
subdir('migration')
--- /dev/null
+/*
+ * Variable page size handling -- target specific part.
+ *
+ * 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/>.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+
+#define IN_EXEC_VARY 1
+
+#include "exec/exec-all.h"
+
+#ifdef TARGET_PAGE_BITS_VARY
+# ifdef CONFIG_ATTRIBUTE_ALIAS
+/*
+ * We want to declare the "target_page" variable as const, which tells
+ * the compiler that it can cache any value that it reads across calls.
+ * This avoids multiple assertions and multiple reads within any one user.
+ *
+ * This works because we finish initializing the data before we ever read
+ * from the "target_page" symbol.
+ *
+ * This also requires that we have a non-constant symbol by which we can
+ * perform the actual initialization, and which forces the data to be
+ * allocated within writable memory. Thus "init_target_page", and we use
+ * that symbol exclusively in the two functions that initialize this value.
+ *
+ * The "target_page" symbol is created as an alias of "init_target_page".
+ */
+static TargetPageBits init_target_page;
+
+/*
+ * Note that this is *not* a redundant decl, this is the definition of
+ * the "target_page" symbol. The syntax for this definition requires
+ * the use of the extern keyword. This seems to be a GCC bug in
+ * either the syntax for the alias attribute or in -Wredundant-decls.
+ *
+ * See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91765
+ */
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wredundant-decls"
+
+extern const TargetPageBits target_page
+ __attribute__((alias("init_target_page")));
+
+# pragma GCC diagnostic pop
+# else
+/*
+ * When aliases are not supported then we force two different declarations,
+ * by way of suppressing the header declaration with IN_EXEC_VARY.
+ * We assume that on such an old compiler, LTO cannot be used, and so the
+ * compiler cannot not detect the mismatched declarations, and all is well.
+ */
+TargetPageBits target_page;
+# define init_target_page target_page
+# endif
+#endif
+
+bool set_preferred_target_page_bits(int bits)
+{
+ /*
+ * The target page size is the lowest common denominator for all
+ * the CPUs in the system, so we can only make it smaller, never
+ * larger. And we can't make it smaller once we've committed to
+ * a particular size.
+ */
+#ifdef TARGET_PAGE_BITS_VARY
+ assert(bits >= TARGET_PAGE_BITS_MIN);
+ if (init_target_page.bits == 0 || init_target_page.bits > bits) {
+ if (init_target_page.decided) {
+ return false;
+ }
+ init_target_page.bits = bits;
+ }
+#endif
+ return true;
+}
+
+void finalize_target_page_bits(void)
+{
+#ifdef TARGET_PAGE_BITS_VARY
+ if (init_target_page.bits == 0) {
+ init_target_page.bits = TARGET_PAGE_BITS_MIN;
+ }
+ init_target_page.mask = (target_long)-1 << init_target_page.bits;
+ init_target_page.decided = true;
+
+ /*
+ * For the benefit of an -flto build, prevent the compiler from
+ * hoisting a read from target_page before we finish initializing.
+ */
+ barrier();
+#endif
+}
projects / qemu.git / commitdiff