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| author | Star Zeng <star.zeng@intel.com> | 2015-07-27 03:04:03 +0000 |
|---|---|---|
| committer | lzeng14 <lzeng14@Edk2> | 2015-07-27 03:04:03 +0000 |
| commit | 353f5ba92f9420266bbf5dd86c3faae35db6a478 (patch) | |
| tree | fbac5d0cf955fd7871d68379c37e4490c3b95bec /MdeModulePkg | |
| parent | c6368abcf02628fba94c48f7f413f5cae50d1347 (diff) | |
| download | edk2-platforms-353f5ba92f9420266bbf5dd86c3faae35db6a478.tar.xz | |
IntelFrameworkModulePkg AcpiS3SaveDxe: 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.
When BIOS does not support long mode waking vector, 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@18068 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdeModulePkg')
0 files changed, 0 insertions, 0 deletions