[PATCH v2 11/10] OvmfPkg/Csm/LegacyBiosDxe: Fix Legacy16GetTableAddress call for E820 data

["David Woodhouse" <dwmw2@infradead.org>]

The DX register is supposed to contain the required alignment for the
allocation. It was zero, and SeaBIOS doesn't (well, didn't) cope well
with that. Set it appropriately.

Also set BX to indicate the regions it's OK to allocate in too. That
wasn't being initialised and was just using whatever the previous user
of the structure had left there.

Finally, actually return an error if the allocation fails. Instead of
going all the way through into the CSM and just letting it have a bogus
pointer to the E820 data.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
---
 OvmfPkg/Csm/LegacyBiosDxe/LegacyBootSupport.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/OvmfPkg/Csm/LegacyBiosDxe/LegacyBootSupport.c b/OvmfPkg/Csm/LegacyBiosDxe/LegacyBootSupport.c
index 211750c012..cd4cd24f42 100644
--- a/OvmfPkg/Csm/LegacyBiosDxe/LegacyBootSupport.c
+++ b/OvmfPkg/Csm/LegacyBiosDxe/LegacyBootSupport.c
@@ -928,7 +928,9 @@ GenericLegacyBoot (
   if (CopySize > Private->Legacy16Table->E820Length) {
     ZeroMem (&Regs, sizeof (EFI_IA32_REGISTER_SET));
     Regs.X.AX = Legacy16GetTableAddress;
+    Regs.X.BX = (UINT16) 0x0; // Any region
     Regs.X.CX = (UINT16) CopySize;
+    Regs.X.DX = (UINT16) 0x4; // Alignment
     Private->LegacyBios.FarCall86 (
       &Private->LegacyBios,
       Private->Legacy16Table->Compatibility16CallSegment,
@@ -942,6 +944,7 @@ GenericLegacyBoot (
     Private->Legacy16Table->E820Length  = (UINT32) CopySize;
     if (Regs.X.AX != 0) {
       DEBUG ((EFI_D_ERROR, "Legacy16 E820 length insufficient\n"));
+      return EFI_OUT_OF_RESOURCES;
     } else {
       CopyMem (
         (VOID *)(UINTN) Private->Legacy16Table->E820Pointer,
-- 
2.21.0