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| author | Jiewen Yao <jiewen.yao@intel.com> | 2016-10-23 23:21:20 +0800 |
|---|---|---|
| committer | Jiewen Yao <jiewen.yao@intel.com> | 2016-11-17 16:30:05 +0800 |
| commit | 28b020b5de1e1bee4a44e2536f71fc96c781863c (patch) | |
| tree | 99065912b0b3dde9f0ac9e31f18b3ec11b005ff7 | |
| parent | 285a682c7870ed907289eba2ccf1bbc49e0acd14 (diff) | |
| download | edk2-platforms-28b020b5de1e1bee4a44e2536f71fc96c781863c.tar.xz | |
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>
| -rw-r--r-- | UefiCpuPkg/UefiCpuPkg.dec | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec index 542704be70..89779c447d 100644 --- a/UefiCpuPkg/UefiCpuPkg.dec +++ b/UefiCpuPkg/UefiCpuPkg.dec @@ -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.
|