Commit graph

5 commits

Author SHA1 Message Date
Andrew Boie
25a8aef275 x86: enable MMU for application memory
Configuring the RAM/ROM regions will be the same for all
x86 targets as this is done with linker symbols.

Peripheral configuration left at the SOC level.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
2017-08-03 11:46:26 -04:00
Andrew Boie
9ffaaae5ad x86: additional debug output for page faults
Page faults will additionally dump out some interesting
page directory and page table flags for the faulting
memory address.

Intended to help determine whether the page tables have been
configured incorrectly as we enable memory protection features.

This only happens if CONFIG_EXCEPTION_DEBUG is turned on.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
2017-08-03 11:46:26 -04:00
Andrew Boie
6101aa6220 x86: add API for modifying page tables
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
2017-07-25 11:32:36 -04:00
Andrew Boie
bc666ae7f7 x86: implement improved double-fault handler
We now create a special IA hardware task for handling
double faults. This has a known good stack so that if
the kernel tries to push stack data onto an unmapped page,
we don't triple-fault and reset the system.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
2017-07-25 11:32:36 -04:00
Adithya Baglody
079b17b312 x86: MMU: Validate user Buffer
A user space buffer must be validated before required operation
can proceed. This API will check the current MMU
configuration to determine if the buffer held by the user is valid.

Jira: ZEP-2326

Signed-off-by: Adithya Baglody <adithya.nagaraj.baglody@intel.com>
2017-07-19 08:06:44 -07:00