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| author | Yao, Jiewen <jiewen.yao@intel.com> | 2015-11-26 07:01:08 +0000 |
|---|---|---|
| committer | jyao1 <jyao1@Edk2> | 2015-11-26 07:01:08 +0000 |
| commit | 8e496a7abcb78c36b0af47ed473096ef7f171606 (patch) | |
| tree | 780d46ef05f34a2c82220006b79cfdc8e7f70fee /UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c | |
| parent | 989edf1633ab9a9fc9904c90b1a49ae84c5bbbe2 (diff) | |
| download | edk2-8e496a7abcb78c36b0af47ed473096ef7f171606.zip edk2-8e496a7abcb78c36b0af47ed473096ef7f171606.tar.gz edk2-8e496a7abcb78c36b0af47ed473096ef7f171606.tar.bz2 | |
Always set WP in CR0.
Always set RW+P bit for page table by default.
So that we can use write-protection for code later.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: "Yao, Jiewen" <jiewen.yao@intel.com>
Reviewed-by: "Kinney, Michael D" <michael.d.kinney@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18960 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c')
| -rw-r--r-- | UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c index a7d790f..d242e06 100644 --- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c @@ -127,7 +127,7 @@ SmmInitPageTable ( // Fill Page-Table-Level4 (PML4) entry
//
PTEntry = (UINT64*)(UINTN)(Pages - EFI_PAGES_TO_SIZE (PAGE_TABLE_PAGES + 1));
- *PTEntry = Pages + IA32_PG_P;
+ *PTEntry = Pages + PAGE_ATTRIBUTE_BITS;
ZeroMem (PTEntry + 1, EFI_PAGE_SIZE - sizeof (*PTEntry));
//
// Set sub-entries number
@@ -591,7 +591,7 @@ SmiDefaultPFHandler ( //
// If the entry is not present, allocate one page from page pool for it
//
- PageTable[PTIndex] = AllocPage () | IA32_PG_RW | IA32_PG_P;
+ PageTable[PTIndex] = AllocPage () | PAGE_ATTRIBUTE_BITS;
} else {
//
// Save the upper entry address
@@ -621,7 +621,7 @@ SmiDefaultPFHandler ( // Fill the new entry
//
PageTable[PTIndex] = (PFAddress & gPhyMask & ~((1ull << EndBit) - 1)) |
- PageAttribute | IA32_PG_A | IA32_PG_RW | IA32_PG_P;
+ PageAttribute | IA32_PG_A | PAGE_ATTRIBUTE_BITS;
if (UpperEntry != NULL) {
SetSubEntriesNum (UpperEntry, GetSubEntriesNum (UpperEntry) + 1);
}
|