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| author | Star Zeng <star.zeng@intel.com> | 2015-07-27 03:05:13 +0000 |
|---|---|---|
| committer | lzeng14 <lzeng14@Edk2> | 2015-07-27 03:05:13 +0000 |
| commit | b2d2a7f3f2fff5576945881c5c4ee5f293604465 (patch) | |
| tree | 2318b4f4bbf9824ecb5dab7986a384eaa9bfcc17 /MdePkg | |
| parent | 716087e2becafbac134a2cbd5e7cc6da684adc74 (diff) | |
| download | edk2-platforms-b2d2a7f3f2fff5576945881c5c4ee5f293604465.tar.xz | |
MdeModulePkg CapsuleRuntimeDxe: Reduce reserved memory consumption
Reduce reserved memory consumption by page table buffer,
then OS can have more available memory to use.
Take PhysicalAddressBits = 48 and 2MB page granularity as example,
1:1 Virtual to Physical identity mapping page table buffer needs to be
((512 + 1) * 512 + 1) * 4096 = 1075843072 bytes = 0x40201000 bytes.
The code is updated to only allocate 2 pages (1G page enabled) or
6 pages for 4G page table, and 8 extra pages to handles > 4G request
by page fault.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18070 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdePkg')
0 files changed, 0 insertions, 0 deletions