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[qemu.git] / include / qemu / osdep.h

diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 9dd318a7dd9333e979aef860cdae9117447222e8..41658060a7a83953c5063e2dc88cb2275557b890 100644 (file)
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -147,8 +147,35 @@ extern int daemon(int, int);
 #if !defined(ESHUTDOWN)
 #define ESHUTDOWN 4099
 #endif
+
+/* time_t may be either 32 or 64 bits depending on the host OS, and
+ * can be either signed or unsigned, so we can't just hardcode a
+ * specific maximum value. This is not a C preprocessor constant,
+ * so you can't use TIME_MAX in an #ifdef, but for our purposes
+ * this isn't a problem.
+ */
+
+/* The macros TYPE_SIGNED, TYPE_WIDTH, and TYPE_MAXIMUM are from
+ * Gnulib, and are under the LGPL v2.1 or (at your option) any
+ * later version.
+ */
+
+/* True if the real type T is signed.  */
+#define TYPE_SIGNED(t) (!((t)0 < (t)-1))
+
+/* The width in bits of the integer type or expression T.
+ * Padding bits are not supported.
+ */
+#define TYPE_WIDTH(t) (sizeof(t) * CHAR_BIT)
+
+/* The maximum and minimum values for the integer type T.  */
+#define TYPE_MAXIMUM(t)                                                \
+  ((t) (!TYPE_SIGNED(t)                                                \
+        ? (t)-1                                                        \
+        : ((((t)1 << (TYPE_WIDTH(t) - 2)) - 1) * 2 + 1)))
+
 #ifndef TIME_MAX
-#define TIME_MAX LONG_MAX
+#define TIME_MAX TYPE_MAXIMUM(time_t)
 #endif
 
 /* HOST_LONG_BITS is the size of a native pointer in bits. */
@@ -228,7 +255,7 @@ extern int daemon(int, int);
 int qemu_daemon(int nochdir, int noclose);
 void *qemu_try_memalign(size_t alignment, size_t size);
 void *qemu_memalign(size_t alignment, size_t size);
-void *qemu_anon_ram_alloc(size_t size, uint64_t *align);
+void *qemu_anon_ram_alloc(size_t size, uint64_t *align, bool shared);
 void qemu_vfree(void *ptr);
 void qemu_anon_ram_free(void *ptr, size_t size);
 
@@ -338,6 +365,9 @@ void qemu_anon_ram_free(void *ptr, size_t size);
 #elif defined(__linux__) && defined(__s390x__)
    /* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */
 #  define QEMU_VMALLOC_ALIGN (256 * 4096)
+#elif defined(__linux__) && defined(__sparc__)
+#include <sys/shm.h>
+#  define QEMU_VMALLOC_ALIGN MAX(getpagesize(), SHMLBA)
 #else
 #  define QEMU_VMALLOC_ALIGN getpagesize()
 #endif
@@ -371,6 +401,8 @@ void sigaction_invoke(struct sigaction *action,
 #endif
 
 int qemu_madvise(void *addr, size_t len, int advice);
+int qemu_mprotect_rwx(void *addr, size_t size);
+int qemu_mprotect_none(void *addr, size_t size);
 
 int qemu_open(const char *name, int flags, ...);
 int qemu_close(int fd);
@@ -505,6 +537,12 @@ char *qemu_get_pid_name(pid_t pid);
  */
 pid_t qemu_fork(Error **errp);
 
+/* Using intptr_t ensures that qemu_*_page_mask is sign-extended even
+ * when intptr_t is 32-bit and we are aligning a long long.
+ */
+extern uintptr_t qemu_real_host_page_size;
+extern intptr_t qemu_real_host_page_mask;
+
 extern int qemu_icache_linesize;
 extern int qemu_dcache_linesize;