> +/**
> + Initialize a buffer pool for page table use only.
> +
> + To reduce the potential split operation on page table, the pages reserved
> for
> + page table should be allocated in the times of PAGE_TABLE_POOL_UNIT_PAGES
> and
> + at the boundary of PAGE_TABLE_POOL_ALIGNMENT. So the page pool is always
> + initialized with number of pages greater than or equal to the given
> + PoolPages.
Hmm, doesn't have tianocore a lib for such allocation pools?
> + //
> + // Link all pools into a list for easier track later.
> + //
Seems to be never used.
> +/**
> + Disable Write Protect on pages marked as read-only.
> +**/
> +STATIC
> +VOID
> +DisableReadOnlyPageWriteProtect (
Why this is needed?
> +typedef union {
> + struct {
> + UINT64 Present:1; // 0 = Not present in memory,
> + // 1 = Present in memory
> + UINT64 ReadWrite:1; // 0 = Read-Only, 1= Read/Write
> + UINT64 UserSupervisor:1; // 0 = Supervisor, 1=User
> + UINT64 WriteThrough:1; // 0 = Write-Back caching,
> + // 1 = Write-Through caching
> + UINT64 CacheDisabled:1; // 0 = Cached, 1=Non-Cached
> + UINT64 Accessed:1; // 0 = Not accessed,
> + // 1 = Accessed (set by CPU)
> + UINT64 Reserved:1; // Reserved
> + UINT64 MustBeZero:2; // Must Be Zero
> + UINT64 Available:3; // Available for use by system software
> + UINT64 PageTableBaseAddress:40; // Page Table Base Address
> + UINT64 AvabilableHigh:11; // Available for use by system software
> + UINT64 Nx:1; // No Execute bit
> + } Bits;
> + UINT64 Uint64;
> +} PAGE_MAP_AND_DIRECTORY_POINTER;
No need to add that, there is OvmfPkg/Include/IndustryStandard/PageTable.h
take care,
Gerd
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