mirror of https://github.com/acidanthera/audk.git
c6368abcf0
We are going to 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. Current BootScriptExecutorDxe handles > 4G request by page fault because S3ResumePeim only builds 4G page table when long mode waking vector is not needed, but BootScriptExecutorDxe still assume the page table buffer for page table is at 1:1 Virtual to Physical identity mapping. To reduce reserved memory consumption, the code is updated to only use 8 extra pages to handles > 4G request by page fault. Another, when both BIOS and OS wants long mode waking vector, S3ResumePei should have established 1:1 Virtual to Physical identity mapping page table for ACPI spec requirement, so no need to hook page fault handler. 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@18067 6f19259b-4bc3-4df7-8a09-765794883524 |
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| Application | ||
| Bus | ||
| Core | ||
| Include | ||
| Library | ||
| Logo | ||
| Universal | ||
| Contributions.txt | ||
| License.txt | ||
| MdeModulePkg.dec | ||
| MdeModulePkg.dsc | ||
| MdeModulePkg.uni | ||
| MdeModulePkgExtra.uni | ||