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util: add qemu_get_host_physmem utility function

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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.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Cc: BALATON Zoltan <balaton@eik.bme.hu>
Cc: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Message-Id: <20200724064509.331-5-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée
2020-07-24 07:44:57 +01:00
parent 7d2d6522bb
commit ad06ef0efb
3 changed files with 33 additions and 0 deletions
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12
include/qemu/osdep.h
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@ -668,4 +668,16 @@ static inline void qemu_reset_optind(void)
*/
char *qemu_get_host_name(Error **errp);
/**
* qemu_get_host_physmem:
*
* Operating system agnostic 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. At the other
* end we saturate to SIZE_MAX if you are lucky enough to have that
* much memory.
*/
size_t qemu_get_host_physmem(void);
#endif