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-rw-r--r--IntelFrameworkModulePkg/Csm/LegacyBiosDxe/Thunk.c13
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)