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OvmfPkg/QemuFwCfgLib: Add option to dynamic alloc FW_CFG_DMA Access 

Update InternalQemuFwCfgDmaBytes() to work with DMA Access pointer.
The change provides the flexibility to dynamically allocate the "Access"
when SEV is enabled.

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
This commit is contained in:
Brijesh Singh 2017-07-06 09:29:13 -04:00 committed by Jordan Justen
parent 09719a01b1
commit 7cfe445d7f
1 changed files with 10 additions and 7 deletions
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17
OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c
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@ -68,7 +68,8 @@ InternalQemuFwCfgDmaBytes (
IN UINT32 Control
)
{
volatile FW_CFG_DMA_ACCESS Access;
volatile FW_CFG_DMA_ACCESS LocalAccess;
volatile FW_CFG_DMA_ACCESS *Access;
UINT32 AccessHigh, AccessLow;
UINT32 Status;
@ -79,9 +80,11 @@ InternalQemuFwCfgDmaBytes (
return;
}
Access.Control = SwapBytes32 (Control);
Access.Length = SwapBytes32 (Size);
Access.Address = SwapBytes64 ((UINTN)Buffer);
Access = &LocalAccess;
Access->Control = SwapBytes32 (Control);
Access->Length = SwapBytes32 (Size);
Access->Address = SwapBytes64 ((UINTN)Buffer);
//
// Delimit the transfer from (a) modifications to Access, (b) in case of a
@ -92,8 +95,8 @@ InternalQemuFwCfgDmaBytes (
//
// Start the transfer.
//
AccessHigh = (UINT32)RShiftU64 ((UINTN)&Access, 32);
AccessLow = (UINT32)(UINTN)&Access;
AccessHigh = (UINT32)RShiftU64 ((UINTN)Access, 32);
AccessLow = (UINT32)(UINTN)Access;
IoWrite32 (FW_CFG_IO_DMA_ADDRESS, SwapBytes32 (AccessHigh));
IoWrite32 (FW_CFG_IO_DMA_ADDRESS + 4, SwapBytes32 (AccessLow));
@ -106,7 +109,7 @@ InternalQemuFwCfgDmaBytes (
// Wait for the transfer to complete.
//
do {
Status = SwapBytes32 (Access.Control);
Status = SwapBytes32 (Access->Control);
ASSERT ((Status & FW_CFG_DMA_CTL_ERROR) == 0);
} while (Status != 0);