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UefiCpuPkg/dec: Add PcdCpuSmmStaticPageTable. 

If enabled, SMM will not use on-demand paging.
SMM will build static page table for all memory.

The page table size depend on 2 things:
1) The 1G paging capability.
2) The whole system memory/MMIO addressing capability.

A) If the system only supports 2M paging,
When the whole memory/MMIO is 32bit, we only need 1+1+4=6 pages for 4G.
When the whole memory/MMIO is 39bit, we need 1+1+256 pages (~ 1M)
When the whole memory/MMIO is 48bit, we need 1+256+256*256 pages (~ 257M)

B) If the system supports 1G paging.
When the whole memory/MMIO is 32bit, we only need 1+1+4=6 pages for 4G.
(We still generate 2M page for maintenance consideration.)
When the whole memory/MMIO is 39bit, we still need 6 pages.
(We setup 1G paging for >1G.)
When the whole memory/MMIO is 48bit, we need 1+256 pages (~ 1M).

Cc: Jeff Fan <jeff.fan@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
This commit is contained in:
Jiewen Yao 2016-10-23 23:21:20 +08:00
parent 285a682c78
commit 28b020b5de
1 changed files with 8 additions and 0 deletions
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UefiCpuPkg/UefiCpuPkg.dec
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@ -206,6 +206,14 @@
# @Prompt The specified AP target C-state for Mwait.
gUefiCpuPkgTokenSpaceGuid.PcdCpuApTargetCstate|0|UINT8|0x00000007
## Indicates if SMM uses static page table.
# If enabled, SMM will not use on-demand paging. SMM will build static page table for all memory.<BR><BR>
# This flag only impacts X64 build, because SMM alway builds static page table for IA32.
# TRUE - SMM uses static page table for all memory.<BR>
# FALSE - SMM uses static page table for below 4G memory and use on-demand paging for above 4G memory.<BR>
# @Prompt Use static page table for all memory in SMM.
gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmStaticPageTable|TRUE|BOOLEAN|0x3213210D
[PcdsDynamic, PcdsDynamicEx]
## Contains the pointer to a CPU S3 data buffer of structure ACPI_CPU_DATA.
# @Prompt The pointer to a CPU S3 data buffer.