diff options
Diffstat (limited to 'UefiCpuPkg')
| -rw-r--r-- | UefiCpuPkg/CpuDxe/CpuPageTable.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/UefiCpuPkg/CpuDxe/CpuPageTable.c b/UefiCpuPkg/CpuDxe/CpuPageTable.c index 33e8ee2d2c..4bee8c7772 100644 --- a/UefiCpuPkg/CpuDxe/CpuPageTable.c +++ b/UefiCpuPkg/CpuDxe/CpuPageTable.c @@ -100,6 +100,7 @@ PAGE_ATTRIBUTE_TABLE mPageAttributeTable[] = { };
PAGE_TABLE_POOL *mPageTablePool = NULL;
+BOOLEAN mPageTablePoolLock = FALSE;
PAGE_TABLE_LIB_PAGING_CONTEXT mPagingContext;
EFI_SMM_BASE2_PROTOCOL *mSmmBase2 = NULL;
@@ -1047,6 +1048,16 @@ InitializePageTablePool ( BOOLEAN IsModified;
//
+ // Do not allow re-entrance.
+ //
+ if (mPageTablePoolLock) {
+ return FALSE;
+ }
+
+ mPageTablePoolLock = TRUE;
+ IsModified = FALSE;
+
+ //
// Always reserve at least PAGE_TABLE_POOL_UNIT_PAGES, including one page for
// header.
//
@@ -1056,9 +1067,15 @@ InitializePageTablePool ( Buffer = AllocateAlignedPages (PoolPages, PAGE_TABLE_POOL_ALIGNMENT);
if (Buffer == NULL) {
DEBUG ((DEBUG_ERROR, "ERROR: Out of aligned pages\r\n"));
- return FALSE;
+ goto Done;
}
+ DEBUG ((
+ DEBUG_INFO,
+ "Paging: added %lu pages to page table pool\r\n",
+ (UINT64)PoolPages
+ ));
+
//
// Link all pools into a list for easier track later.
//
@@ -1092,7 +1109,9 @@ InitializePageTablePool ( );
ASSERT (IsModified == TRUE);
- return TRUE;
+Done:
+ mPageTablePoolLock = FALSE;
+ return IsModified;
}
/**
|