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| author | Yao, Jiewen <jiewen.yao@intel.com> | 2015-11-30 19:57:40 +0000 |
|---|---|---|
| committer | lersek <lersek@Edk2> | 2015-11-30 19:57:40 +0000 |
| commit | 881520ea6778953c57d975ca2a9cf3f2114f99c4 (patch) | |
| tree | bd5c851c7c701bf60af72b036c80477964aec561 /UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.c | |
| parent | 5e04f4b7e1a48cfa9e6b045f953e84becced2e9e (diff) | |
| download | edk2-881520ea6778953c57d975ca2a9cf3f2114f99c4.tar.gz edk2-881520ea6778953c57d975ca2a9cf3f2114f99c4.tar.bz2 edk2-881520ea6778953c57d975ca2a9cf3f2114f99c4.zip | |
UefiCpuPkg/PiSmmCpu: Always set RW+P bit for page table by default
So that we can use write-protection for code later.
This is REPOST.
It includes the bug fix from "Paolo Bonzini" <pbonzini@redhat.com>:
Title: fix generation of 32-bit PAE page tables
"Bits 1 and 2 are reserved in 32-bit PAE Page Directory Pointer Table
Entries (PDPTEs); see Table 4-8 in the SDM. With VMX extended page
tables, the processor notices and fails the VM entry as soon as CR0.PG
is set to 1."
And thanks "Laszlo Ersek" <lersek@redhat.com> to validate the fix.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: "Yao, Jiewen" <jiewen.yao@intel.com>
Signed-off-by: "Paolo Bonzini" <pbonzini@redhat.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Cc: "Fan, Jeff" <jeff.fan@intel.com>
Cc: "Kinney, Michael D" <michael.d.kinney@intel.com>
Cc: "Laszlo Ersek" <lersek@redhat.com>
Cc: "Paolo Bonzini" <pbonzini@redhat.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19067 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.c')
| -rw-r--r-- | UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.c b/UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.c index ff4e28ec58..ec4ec9b067 100644 --- a/UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.c +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.c @@ -557,9 +557,9 @@ InitPaging ( // Split it
for (Level4 = 0; Level4 < SIZE_4KB / sizeof(*Pt); Level4++) {
- Pt[Level4] = Address + ((Level4 << 12) | IA32_PG_RW | IA32_PG_P);
+ Pt[Level4] = Address + ((Level4 << 12) | PAGE_ATTRIBUTE_BITS);
} // end for PT
- *Pte = (UINTN)Pt | IA32_PG_RW | IA32_PG_P;
+ *Pte = (UINTN)Pt | PAGE_ATTRIBUTE_BITS;
} // end if IsAddressSplit
} // end for PTE
} // end for PDE
@@ -608,7 +608,7 @@ InitPaging ( //
// Patch to remove Present flag and RW flag
//
- *Pte = *Pte & (INTN)(INT32)(~(IA32_PG_RW | IA32_PG_P));
+ *Pte = *Pte & (INTN)(INT32)(~PAGE_ATTRIBUTE_BITS);
}
if (Nx && mXdSupported) {
*Pte = *Pte | IA32_PG_NX;
@@ -621,7 +621,7 @@ InitPaging ( }
for (Level4 = 0; Level4 < SIZE_4KB / sizeof(*Pt); Level4++, Pt++) {
if (!IsAddressValid (Address, &Nx)) {
- *Pt = *Pt & (INTN)(INT32)(~(IA32_PG_RW | IA32_PG_P));
+ *Pt = *Pt & (INTN)(INT32)(~PAGE_ATTRIBUTE_BITS);
}
if (Nx && mXdSupported) {
*Pt = *Pt | IA32_PG_NX;
@@ -1244,7 +1244,7 @@ RestorePageTableBelow4G ( //
PageTable[PTIndex] = (PFAddress & ~((1ull << 21) - 1));
PageTable[PTIndex] |= (UINT64)IA32_PG_PS;
- PageTable[PTIndex] |= (UINT64)(IA32_PG_RW | IA32_PG_P);
+ PageTable[PTIndex] |= (UINT64)PAGE_ATTRIBUTE_BITS;
if ((ErrorCode & IA32_PF_EC_ID) != 0) {
PageTable[PTIndex] &= ~IA32_PG_NX;
}
@@ -1277,7 +1277,7 @@ RestorePageTableBelow4G ( // Set new entry
//
PageTable[PTIndex] = (PFAddress & ~((1ull << 12) - 1));
- PageTable[PTIndex] |= (UINT64)(IA32_PG_RW | IA32_PG_P);
+ PageTable[PTIndex] |= (UINT64)PAGE_ATTRIBUTE_BITS;
if ((ErrorCode & IA32_PF_EC_ID) != 0) {
PageTable[PTIndex] &= ~IA32_PG_NX;
}
|