diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2015-03-08 09:47:55 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2015-03-08 09:47:55 +0000 |
| commit | 033c7ddf86fe4315069ac4cf3cfab9bc6035dee7 (patch) | |
| tree | 9a0fcb113fc5ce223b2b1fcc2596b004571c0d35 /util | |
| parent | b6d527fbc0b64a2ba7d83623e47b05c745b88043 (diff) | |
| parent | 7c6044a94e52db8aef9a71d616c7a0914adb71ab (diff) | |
Merge remote-tracking branch 'remotes/spice/tags/pull-spice-20150304-1' into staging
misc spice/qxl fixes.
# gpg: Signature made Wed Mar 4 13:57:42 2015 GMT using RSA key ID D3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg: aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg: aka "Gerd Hoffmann (private) <kraxel@gmail.com>"
* remotes/spice/tags/pull-spice-20150304-1:
hmp: info spice: take out webdav
hmp: info spice: Show string channel name
qxl: drop update_displaychangelistener call for secondary qxl devices
vga: refactor vram_size clamping and rounding
qxl: refactor rounding up to a nearest power of 2
spice: fix invalid memory access to vga.vram
qxl: document minimal video memory for new modes
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'util')
| -rw-r--r-- | util/cutils.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/util/cutils.c b/util/cutils.c index dbe7412bd8..c2250d1ba5 100644 --- a/util/cutils.c +++ b/util/cutils.c @@ -483,6 +483,20 @@ int64_t pow2floor(int64_t value) return value; } +/* round up to the nearest power of 2 (0 if overflow) */ +uint64_t pow2ceil(uint64_t value) +{ + uint8_t nlz = clz64(value); + + if (is_power_of_2(value)) { + return value; + } + if (!nlz) { + return 0; + } + return 1ULL << (64 - nlz); +} + /* * Implementation of ULEB128 (http://en.wikipedia.org/wiki/LEB128) * Input is limited to 14-bit numbers |