This will be used in a future patch. For POSIX systems _SC_PHYS_PAGES
isn't standardised but at least appears in the man pages for
Open/FreeBSD. The result is advisory so any users of it shouldn't just
fail if we can't work it out.
The win32 stub currently returns 0 until someone with a Windows system
can develop and test a patch.
Signed-off-by: Alex Bennée <alex.ben...@linaro.org>
Cc: BALATON Zoltan <bala...@eik.bme.hu>
Cc: Christian Ehrhardt <christian.ehrha...@canonical.com>
---
include/qemu/osdep.h | 10 ++++++++++
util/oslib-posix.c | 11 +++++++++++
util/oslib-win32.c | 6 ++++++
3 files changed, 27 insertions(+)
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 4841b5c6b5f..7ff209983e2 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -665,4 +665,14 @@ static inline void qemu_reset_optind(void)
*/
char *qemu_get_host_name(Error **errp);
+/**
+ * qemu_get_host_physmem:
+ *
+ * Operating system agnostiv way of querying host memory.
+ *
+ * Returns amount of physical memory on the system. This is purely
+ * advisery and may return 0 if we can't work it out.
+ */
+size_t qemu_get_host_physmem(void);
+
#endif
diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index 36bf8593f8c..d9da782b896 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -839,3 +839,14 @@ char *qemu_get_host_name(Error **errp)
return g_steal_pointer(&hostname);
}
+
+size_t qemu_get_host_physmem(void)
+{
+#ifdef _SC_PHYS_PAGES
+ long pages = sysconf(_SC_PHYS_PAGES);
+ if (pages > 0) {
+ return pages * qemu_real_host_page_size;
+ }
+#endif
+ return 0;
+}
diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index 7eedbe5859a..31030463cc9 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -828,3 +828,9 @@ char *qemu_get_host_name(Error **errp)
return g_utf16_to_utf8(tmp, size, NULL, NULL, NULL);
}
+
+size_t qemu_get_host_physmem(void)
+{
+ /* currently unimplemented */
+ return 0;
+}
--
2.20.1
