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Merge pull request #8 from PatrickRudolph/fix_smm_detect

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MdeModulePkg/Universal/Variable/EmuRuntimeDxe: Check SMM store return…
This commit is contained in:
MrChromebox
2020-01-08 16:10:14 -06:00
committed by GitHub
parent 81f6f9c8e8 359e78336d
commit 64f7b0fdba
1 changed files with 11 additions and 3 deletions
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14
MdeModulePkg/Universal/Variable/EmuRuntimeDxe/EmuVariable.c
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@@ -944,6 +944,7 @@ UpdateVariable (
UINTN VarSize;
VARIABLE_GLOBAL *Global;
UINTN NonVolatileVarableStoreSize;
UINT32 Result;
Global = &mVariableModuleGlobal->VariableGlobal[Physical];
@@ -1108,7 +1109,10 @@ UpdateVariable (
CopyMem (keydata + sizeof (EFI_GUID), VariableName, VarNameSize);
CopyMem (valdata, Data, DataSize);
call_smm(SMMSTORE_APM_CNT, SMMSTORE_CMD_APPEND, (UINT32)rt_buffer_phys);
Result = call_smm(SMMSTORE_APM_CNT, SMMSTORE_CMD_APPEND, (UINT32)rt_buffer_phys);
if (Result != SMMSTORE_RET_SUCCESS) {
return EFI_DEVICE_ERROR;
}
/* call into SMM through EFI_ISA_IO_PROTOCOL to write to 0xb2:
* set registers (how?)
* UINT8 Data = ...;
@@ -1875,7 +1879,7 @@ VariableCommonInitialize (
)
{
EFI_STATUS Status;
UINT32 Result;
//
// Allocate memory for mVariableModuleGlobal
//
@@ -1928,7 +1932,11 @@ VariableCommonInitialize (
.bufsize = sizeof(buf),
};
ASSERT((UINTN)&read_cmd <= 0x100000000 - sizeof(read_cmd));
call_smm(SMMSTORE_APM_CNT, SMMSTORE_CMD_READ, (UINT32)(UINTN)&read_cmd);
Result = call_smm(SMMSTORE_APM_CNT, SMMSTORE_CMD_READ, (UINT32)(UINTN)&read_cmd);
if (Result != SMMSTORE_RET_SUCCESS) {
// The SMM store hasn't been compiled in. There's nothing we can do.
return EFI_SUCCESS;
}
DEBUG ((DEBUG_WARN, "Initialize buffer from 0x%x bytes of flash\n", read_cmd.bufsize));
int i = 0;