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authorSuraj Jitindar Singh <sjitindarsingh@gmail.com>2017-03-01 18:12:54 +1100
committerDavid Gibson <david@gibson.dropbear.id.au>2017-03-03 11:30:59 +1100
commit07a68f990785a8574c78a36b21cf5165e46f1113 (patch)
treeec2a208ab06040a3b57845b492a1bb4eca3a1f98 /block/qcow2.c
parent347a5c73bafd1b5872c9d3192a4d08f8aa1d5f5a (diff)
target/ppc: Move no-execute and guarded page checking into new function
A pte entry has bit fields which can be used to make a page no-execute or guarded, if either of these bits are set then an instruction access to this page will fail. Currently these bits are checked with the pp_prot function however the ISA specifies that the access authority controlled by the key-pp value pair should only be checked on an instruction access after the no-execute and guard bits have already been verified to permit the access. Move the no-execute and guard bit checking into a new separate function. Note that we can remove the check for the no-execute bit in the slb entry since this check was already performed above when we obtained the slb entry. In the event that the no-execute or guard bits are set, an ISI should be generated with the SRR1_NOEXEC_GUARD (0x10000000) bit set in srr1. Add a define for this for clarity. Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com> [dwg: Move constants to cpu.h since they're not MMUv3 specific] Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'block/qcow2.c')
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