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| author | Jason Baron <jbaron@akamai.com> | 2014-07-04 13:27:04 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2014-07-04 13:27:30 +0200 |
| commit | 3a044178cccfeb8664423c2950c499c3a209ed9f (patch) | |
| tree | 8e9f4ba1747353932ed218157d05915b28b920c7 /include/xen/xen.h | |
| parent | 6866b390562b2c948c6f6fc2a5c103f090a02e01 (diff) | |
readq/writeq: Add explicit lo_hi_[read|write]_q and hi_lo_[read|write]_q
Even on x86-64, I've found the need to break up a readq() into 2 readl()
calls. According to the Intel datasheet for the E3-1200 processor:
"
Software must not access B0/D0/F0 32-bit memory-mapped registers with
requests that cross a DW boundary.
"
(http://www.intel.com/content/www/us/en/processors/xeon/xeon-e3-1200-family-vol-2-datasheet.html p. 16)
I can confirm this is true via several hard machine lockups.
Thus, add explicit hi_lo_[readq|write]_q and lo_hi_[read|write]_q so that these
uses are spelled out.
Signed-off-by: Jason Baron <jbaron@akamai.com>
Link: http://lkml.kernel.org/r/281f09da7ad01e5cea99737ec34d2399bdbbbf63.1403818526.git.jbaron@akamai.com
Signed-off-by: Borislav Petkov <bp@suse.de>
Diffstat (limited to 'include/xen/xen.h')
0 files changed, 0 insertions, 0 deletions