add system time, clean up pci into pci.sys, clean up syscall names, fix USERAPC1 typo

code/kernel/hal/hal_main.c

@@ -12,6 +12,8 @@ void HalScreenInitialize(void* (*AllocatePool)(size_t size), uintptr_t fb, int w
                         HAL_SCREEN* out);
 KSTATUS HalTimerInitialize(uintptr_t lapicPhys, uintptr_t hpetPhys, HAL_TIMER *out);
 void HalPciInitialize(HAL_PCI* out);
+void HalRtcInitialize(HAL_RTC* out);
+void HalRtcSetCenturyRegister(uint8_t centuryRegister);
 extern void HalSetDebugEnabled(int v);
 
 // Defined in mm_virt.c - HAL needs it for MMIO window access.
@@ -117,6 +119,7 @@ static void *HalPhysToVirt(uint64_t phys) {
 #define FADT_X_DSDT_OFFSET         140u
 #define FADT_X_PM1A_CNT_BLK_OFFSET 172u
 #define FADT_X_PM1B_CNT_BLK_OFFSET 184u
+#define FADT_CENTURY_OFFSET         108u
 
 #pragma pack(push, 1)
 typedef struct {
@@ -312,8 +315,13 @@ static void ParseFadt(const ACPISDTHeader* header) {
     if (!dsdtPhys)
         dsdtPhys = AcpiReadU32(fadt, len, FADT_DSDT_OFFSET);
 
-    HalDbgPrint("HAL: FADT PM1a_CNT=0x%04x PM1b_CNT=0x%04x DSDT=0x%016llx\n",
-                gPm1aCntBlk, gPm1bCntBlk, dsdtPhys);
+    uint8_t centuryRegister = 0;
+    if (FADT_CENTURY_OFFSET < len)
+        centuryRegister = *((const uint8_t*)fadt + FADT_CENTURY_OFFSET);
+    HalRtcSetCenturyRegister(centuryRegister);
+
+    HalDbgPrint("HAL: FADT PM1a_CNT=0x%04x PM1b_CNT=0x%04x DSDT=0x%016llx RTC_CENTURY=0x%02x\n",
+                gPm1aCntBlk, gPm1bCntBlk, dsdtPhys, centuryRegister);
 
     if (dsdtPhys) {
         const ACPISDTHeader* dsdt = (const ACPISDTHeader*)(dsdtPhys + gPhysBase);
@@ -550,6 +558,7 @@ __declspec(dllexport) KSTATUS HalInitialize(const HAL_INIT_PARAMS* initParams) {
     KSTATUS ts = HalTimerInitialize(gLapicPhys, gHpetPhys, &gApi.Timer);
     if (!KSUCCESS(ts)) HalDbgPrint("HAL: HPET unavailable, using fallback\n");
 
+    HalRtcInitialize(&gApi.Rtc);
     HalPciInitialize(&gApi.Pci);
     gApi.Intc.RouteIrq    = HalApicRouteIrq;
     gApi.Intc.MaskIrq     = HalApicMaskIrq;