contiki/cpu
Michael LeMay 4cdb7ba9b6 x86: Add TSS-based protection domain support
This patch extends the protection domain framework with an additional
plugin to use Task-State Segment (TSS) structures to offload much of
the work of switching protection domains to the CPU.  This can save
space compared to paging, since paging requires two 4KiB page tables
and one 32-byte page table plus one whole-system TSS and an additional
32-byte data structure for each protection domain, whereas the
approach implemented by this patch just requires a 128-byte data
structure for each protection domain.  Only a small number of
protection domains will typically be used, so
n * 128 < 8328 + (n * 32).

For additional information, please refer to cpu/x86/mm/README.md.

GCC 6 is introducing named address spaces for the FS and GS segments
[1].  LLVM Clang also provides address spaces for the FS and GS
segments [2].  This patch also adds support to the multi-segment X86
memory management subsystem for using these features instead of inline
assembly blocks, which enables type checking to detect some address
space mismatches.

[1] https://gcc.gnu.org/onlinedocs/gcc/Named-Address-Spaces.html
[2] http://llvm.org/releases/3.3/tools/clang/docs/LanguageExtensions.html#target-specific-extensions
2016-04-22 08:16:39 -07:00
..
6502 Removed CC_FASTCALL. 2015-11-01 18:10:17 +01:00
arm Merge pull request #1344 from tsparber/fix-doxygen 2015-11-30 22:07:15 +01:00
avr Merge pull request #1344 from tsparber/fix-doxygen 2015-11-30 22:07:15 +01:00
cc26xx-cc13xx Allow the caller to access the entire content of CMDSTA 2016-01-24 13:39:14 +00:00
cc253x Removed CC_FASTCALL. 2015-11-01 18:10:17 +01:00
cc2538 cc2538: Fix GCC 5 warning 2016-01-09 15:43:20 +01:00
mc1322x Merge pull request #1344 from tsparber/fix-doxygen 2015-11-30 22:07:15 +01:00
msp430 Adding definitions required for TSCH to the sky and z1 platforms 2015-12-04 15:21:53 +01:00
native Change the default IPv6 prefix from aaaa::/64 to fd00::/64 2016-03-07 17:47:44 +01:00
pic32 [cpu/pic32] Removed excess end group 2014-11-10 23:53:33 +01:00
rl78 The -pedantic and -stdc flags trigger a few too many warnings 2015-10-20 10:11:35 +02:00
stm32w108 Merge pull request #1344 from tsparber/fix-doxygen 2015-11-30 22:07:15 +01:00
x86 x86: Add TSS-based protection domain support 2016-04-22 08:16:39 -07:00