CPUInfo

Function Table

Address	Name	Description
	CpuInfoEntryPoint
	GetPeiServices
	VgaPrintStringAt
	AsmCpuid
	CpuId
	AsciiStrLen
	ReadIdtr
	CpuInfoReportAssertion
	CpuDeadLoop
EFI_STATUS	codes used in GetCpuPresenceStatus
approximate	#define CPU_NOT_PRESENT 0
VGA	constants
Progress	display table entry: { x, y }
Terminated	with x == 0xFF / -1
Forward	declarations
EFI_STATUS	EFIAPI
Helper	function prototypes
EFI_STATUS	GetPeiServices (
Module	Entry Point
Display	initial POST progress: 0%
VgaPrintStringAt	(0, 9, "== Progress : 0% ==");
Iterate	the progress-position table and display
at	each position until terminator (-1) is found.
The	table is an array of PROGRESS_POSITION {X,Y}
entries	at byte_FFE83F24.
ProgressTable	*= (PROGRESS_POSITION)(UINTN)0xFFE83F24;**
Skip	entry (50,y) when y is in [11..21] — these are
the	"already displayed" slots.
if	**(X != 50		Y < 11	Y > 21) {**
Install	PPI or propagate descriptor to next PEIM
table	at offset +36 (sizeof(EFI_PEI_SERVICES) + 36)
with	unk_FFE83F14 as the parameter. This could be
In	the PEIM case, this likely dispatches a notification
or	installs a PPI.
return	EFI_SUCCESS;
VGA	Print Support
Calculate	VGA buffer offset: 2 bytes per cell
VGA	memory starts at 0xB8000 (753664 in decimal)
VgaPtr	*= VGA_TEXT_MEMORY + (X + Y 80);**
Hide	cursor by setting cursor position to scanline 32
IoWrite8	(VGA_CRTC_ADDR_PORT, VGA_CURSOR_START);
Write	string characters with attribute 7
for	(Index = 0; Index < Length; Index++) {
Set	attribute of the last character (foreground)
CPU	Presence Detection
Read	current RTC address register, preserve NMI mask (bit 7)
select	CMOS index 0x4A (CPU presence)
OriginalReg	= IoRead8 (RTC_ADDRESS_PORT);
Read	CPU presence value from CMOS data register
CmosValue	= IoRead8 (RTC_DATA_PORT);
Interpret	the value:
if	(CmosValue > 3) {
Read	GPIO/MMIO register at fixed address for CPU presence
bit	1 set = CPU present
CmosValue	= ((volatile UINT8)0xFDAF0490 & 2)	1;**
No	CPU
0xFF	means not valid/empty
if	(CmosValue == 0xFF) {
Empty	socket
0xFFFFFFFF	}
0x80000000	(-2147483648)
PEI	Services Access
The	PEI Services pointer is stored at the DWORD immediately
before	the IDT base address.
PeiServices	*= (UINTN)((UINTN)&Idtr.Base - sizeof (UINTN));*
Call	PEI Service at offset 32 (likely LocatePpi or similar)
looking	for the GUID at unk_FFE83EF4.
if	*((PeiServices)->LocatePpi (**
Debug	Print (Conditional)
Call	PEI Services debug print at offset 0
This	is typically DebugPrint or similar.
return	*((PeiServices + 0))(ErrorLevel, Format, (CHAR8)Va);*
CPUID	Wrappers
Check	if leaf 0x0B is supported (EBX non-zero means valid)
if	(a1 != NULL) {
ASSERT	/ Debug Assert Support
PEI_SERVICES	+ 4 is ReportStatusCode or assertion handler
String	Helpers
IDTR	Access
Memory	Functions
Check	for backwards overlap: if src < dst and src+count-1 >= dst
copy	from end to start.
if	((UINTN)Src8 < (UINTN)Dst8 && ((UINTN)Src8 + Count - 1) >= (UINTN)Dst8) {
Src8	= &Src8[Count - 1];
for	(; Count >= 4; Count -= 4) {

Generated by HR650X BIOS Decompilation Project