diff options
| -rw-r--r-- | IntelFrameworkModulePkg/Csm/LegacyBiosDxe/Thunk.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/Thunk.c b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/Thunk.c index 9a62499f05..16c873d8f5 100644 --- a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/Thunk.c +++ b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/Thunk.c @@ -57,6 +57,8 @@ LegacyBiosInt86 ( IN EFI_IA32_REGISTER_SET *Regs
)
{
+ UINT32 *VectorBase;
+
Regs->X.Flags.Reserved1 = 1;
Regs->X.Flags.Reserved2 = 0;
Regs->X.Flags.Reserved3 = 0;
@@ -66,11 +68,16 @@ LegacyBiosInt86 ( Regs->X.Flags.IF = 0;
Regs->X.Flags.TF = 0;
Regs->X.Flags.CF = 0;
-
+ //
+ // The base address of legacy interrupt vector table is 0.
+ // We use this base address to get the legacy interrupt handler.
+ //
+ VectorBase = 0;
+
return InternalLegacyBiosFarCall (
This,
- (UINT16) (((UINT32 *)NULL)[BiosInt] >> 16),
- (UINT16) ((UINT32 *)NULL)[BiosInt],
+ (UINT16) ((VectorBase)[BiosInt] >> 16),
+ (UINT16) (VectorBase)[BiosInt],
Regs,
&Regs->X.Flags,
sizeof (Regs->X.Flags)
|