PeiFrb

Function Table

Address	Name	Description
	ModuleEntryPoint
	DebugPrint
CMOS	RTC I/O ports and register indices
FRB	timeout status memory-mapped IO address
ServerSetup	variable byte offsets
FRB	enable flag at offset 6 in ServerSetup data
Timer	multiplier byte at offset 7
PEI_SERVICES	function table offsets (IA32 flat model)
FRB	*default timeout: 3600 100ms = 360 seconds = 6 minutes**
Each	unit = 100ms
Local	FRB configuration structure (6 bytes)
typedef	struct {
GUID	external declarations (defined in .data section of the PE32)
extern	EFI_GUID gEfiFirmwareVolumeBlock2ProtocolGuid;
FRB	PPI descriptor (installed before exit)
extern	EFI_PEI_PPI_DESCRIPTOR gPeiFrbPpiDescriptor;
Function	prototypes
EFI_STATUS	EFIAPI
Validate	the PEI Services revision
if	*((PeiServices)->Hdr.Revision < PEI_SERVICES_REVISION) {**
Initialize	FRB config structure: enabled=TRUE, all zeros
FrbEnabled	= TRUE;
Locate	the AMI PlatformSetup PPI
Status	*= (PeiServices)->LocatePpi (**
Read	FRB setup configuration from ServerSetup NVRAM variable
GetFrbSetupData	((INT32)SystemTable, &FrbCfg, &FrbEnabled);
Configure	FRB: set reset type bits to cold reset
preserve	timeout value from ServerSetup
Enable	FRB, preserve timeout
Write	FRB config to NVRAM via platform setup PPI (SetVariable #36)
Dummy	= 0;
Clear	the FRB reset-pending variable (SetVariable #34)
Install	FRB PPI to notify subsequent PEIMs
return	*(PeiServices)->InstallPpi (**
FRB	not enabled in ServerSetup
return	EFI_INVALID_PARAMETER;
Locate	Firmware Volume Block 2 protocol to access NVRAM
Status	*= (PeiServices)->LocateProtocol (**
FVB	not available: assert and report error
AssertHandler	(0x80000000, "\nASSERT_EFI_ERROR (Status = %r)\n", Status);
Read	ServerSetup variable (expect max 1072 bytes)
VarSize	= 1072;
Extract	FRB enable flag (byte offset 6 in ServerSetup data)
Compute	*timeout: 10 byte at offset 7**
Timeout	*= FRB_TIMEOUT_SCALE (INT32)(UINT32 )&VarData[FRB_VAR_TIMEOUT_BYTE];**
Locate	EFI_PEI_DEBUG2_PPI
if	*((PeiServices)->LocatePpi (**
Only	print assert if reset type allows it
return	*((INT32 (__cdecl )(INT32, const CHAR8* , CHAR8 ))Result)(*
Save	bit 7 of CMOS index, set index to Status Register A (0x4A)
RtcIdx	= IoRead8 (RTC_INDEX_PORT);
Read	the reset type value from CMOS data port
ResetValue	= IoRead8 (RTC_DATA_PORT);
Interpret	the reset type:
0	= Power-on (cold start)
1	= Warm reset via FRB timeout logic
if	((UINT8)ResetValue <= 3) {
Direct	interpretation for values 0-3
if	(ResetValue == 0) {
0x80000004	= EFI_WARN_RESET_COLD? No, actually this is EFI_WARN_RESET_WARM
Return	value: if ResetValue != 1 -> cold reset
return	0x80000004; // FRB reset: warm
EFI_WARN_RESET_COLD	/ FRB reset: cold
Src	*= &((CHAR8 )Source)[Count - 1];**
Remaining	= Count & 3;

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