OvmfPkg/AcpiPlatformDxe: add QEMU_LOADER_WRITE_POINTER definitions

Cc: Jordan Justen <jordan.l.justen@intel.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=359
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/OvmfPkg/AcpiPlatformDxe/QemuLoader.h b/OvmfPkg/AcpiPlatformDxe/QemuLoader.h
index b29944378d..437776d86d 100644
--- a/OvmfPkg/AcpiPlatformDxe/QemuLoader.h
+++ b/OvmfPkg/AcpiPlatformDxe/QemuLoader.h
@@ -28,6 +28,7 @@ typedef enum {
   QemuLoaderCmdAllocate = 1,

   QemuLoaderCmdAddPointer,

   QemuLoaderCmdAddChecksum,

+  QemuLoaderCmdWritePointer,

 } QEMU_LOADER_COMMAND_TYPE;

 

 typedef enum {

@@ -72,12 +73,37 @@ typedef struct {
   UINT32 Length;

 } QEMU_LOADER_ADD_CHECKSUM;

 

+//

+// QemuLoaderCmdWritePointer: the bytes at

+// [PointerOffset..PointerOffset+PointerSize) in the writeable fw_cfg file

+// PointerFile are to receive the absolute address of PointeeFile, as allocated

+// and downloaded by the firmware, incremented by the value of PointeeOffset.

+// Store the sum of (a) the base address of where PointeeFile's contents have

+// been placed (when QemuLoaderCmdAllocate has been executed for PointeeFile)

+// and (b) PointeeOffset, to this portion of PointerFile.

+//

+// This command is similar to QemuLoaderCmdAddPointer; the difference is that

+// the "pointer to patch" does not exist in guest-physical address space, only

+// in "fw_cfg file space". In addition, the "pointer to patch" is not

+// initialized by QEMU in-place with a possibly nonzero offset value: the

+// relative offset into PointeeFile comes from the explicit PointeeOffset

+// field.

+//

+typedef struct {

+  UINT8  PointerFile[QEMU_LOADER_FNAME_SIZE]; // NUL-terminated

+  UINT8  PointeeFile[QEMU_LOADER_FNAME_SIZE]; // NUL-terminated

+  UINT32 PointerOffset;

+  UINT32 PointeeOffset;

+  UINT8  PointerSize;                         // one of 1, 2, 4, 8

+} QEMU_LOADER_WRITE_POINTER;

+

 typedef struct {

   UINT32 Type;                             // QEMU_LOADER_COMMAND_TYPE values

   union {

     QEMU_LOADER_ALLOCATE      Allocate;

     QEMU_LOADER_ADD_POINTER   AddPointer;

     QEMU_LOADER_ADD_CHECKSUM  AddChecksum;

+    QEMU_LOADER_WRITE_POINTER WritePointer;

     UINT8                     Padding[124];

   } Command;

 } QEMU_LOADER_ENTRY;