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// TITLE("System Initialization")//++//// Module Name://// start.s//// Abstract://// This module implements the code necessary to initially startup the// NT system.//// Author://// Bernard Lint 8-Dec-1995//// Environment://// Kernel mode only.//// Revision History://// Based on MIPS version (from David N. Cutler (davec) 5-Apr-1991)////--
#include "ksia64.h"
PublicFunction(SwapFromIdle) PublicFunction(KeBugCheck) PublicFunction(KiInitializeKernel) PublicFunction(KeLowerIrql) PublicFunction(KiNormalSystemCall) PublicFunction(KiRetireDpcList) PublicFunction(KeAcquireQueuedSpinLockAtDpcLevel) PublicFunction(KeReleaseQueuedSpinLockFromDpcLevel) PublicFunction(KeTryToAcquireQueuedSpinLockRaiseToSynch)
.global __imp_HalProcessorIdle .global KiIvtBase .global KiIA64PtaContents
#if !defined(NT_UP)
.global HalAllProcessorsStarted .global KeNumberProcessors .global KiBarrierWait .global KiKernelPcrPage#endif // !defined(NT_UP)
#if DBG
PublicFunction(KdPollBreakIn) PublicFunction(DbgBreakPointWithStatus) .global KdDebuggerEnabled#endif // DBG
SBTTL("System Initialization")//++// Routine://// VOID// KiSystemBegin (// PLOADER_PARAMETER_BLOCK)//// Routine Description://// This routine is called when the NT system begins execution.// Its function is to initialize system hardware state, call the// kernel initialization routine, and then fall into code that// represents the idle thread for all processors.//// Arguments://// a0 - Supplies a pointer to the loader parameter block.//// Return Value://// None.//// Note://// On entry the global pointer (gp) is initialized for this module (the// NTOS kernel) by the loader.////--
NESTED_ENTRY(KiSystemBegin) ALTERNATE_ENTRY(_start) NESTED_SETUP(1,2,6,0) // Also see "alloc" below
//// Register aliases//
rpT1 = t0 rpT2 = t1 rpT3 = t2 rT1 = t3 rT2 = t4 rT3 = t5 rT4 = t6
rpLpb = t7 rThread = t8 rPcrPfn = t9 rPrcb = t10 rPcr2Pfn = t11 rProcNum = t12 rPKR = t13 rPkrNum = t14 rRR = t15 rKstack = t16 rVa = t17 rPcrTr = t18 rpPcr = t19
FAST_DISABLE_INTERRUPTS // disable interrupts//// invalidate ITR used by SAL.//
mov rT2 = 0x14 << 2 movl rT3 = 0x03f00000 ;;
ptr.i rT3, rT2
ALTERNATE_ENTRY(KiInitializeSystem)
mov ar.rsc = r0 // put RSE in lazy mode movl rT2 = KiIvtBase ;;
rsm 1 << PSR_IC // PSR.ic = 0 mov cr.iva = rT2#if !defined(NT_UP)
add rpT1 = @gprel(KiKernelPcrPage), gp ;;
ld8 rPcrPfn = [rpT1]#else
mov rPcrPfn = 0#endif
;;
srlz.d add rpT2 = LpbPcrPage, a0 // -> PCR page number cmp.eq pt0, pt1 = 0, rPcrPfn ;;
//// Initialize fixed TLB entries that map the PCR into system and user space.// N.B. These pages are per *processor* so we need a fixed mapping.//
(pt0) ld8 rPcrPfn = [rpT2] // set PCR page number movl rVa = KiPcr // set virtual address of PCR ;;
mov cr.ifa = rVa // setup IFA for insert mov rT1 = PAGE_SHIFT << IDTR_PS shl rPcrPfn = rPcrPfn, PAGE_SHIFT // shift to PPN field ;;
mov cr.itir = rT1 // setup IDTR movl rPcrTr = KIPCR_TR_INITIAL // PCR translation except for PPN
mov rT2 = DTR_KIPCR_INDEX ;;
or rPcrTr = rPcrPfn, rPcrTr // form full TR ;;
itr.d dtr[rT2] = rPcrTr // insert PCR TR to DTR ssm 1 << PSR_IC // PSR.ic = 1 ;;
srlz.i // I serialize add rpT1 = LpbKernelStack, a0 // -> idle thread stack mov rpLpb = a0 // save a0 ;;
LDPTR (rKstack, rpT1) // rKstack = idle thread stack // N.B. This is also the base // of backing store ;;
mov ar.bspstore = rKstack // setup BSP .fframe STACK_SCRATCH_AREA add sp = -STACK_SCRATCH_AREA, rKstack // set sp ;;
loadrs // invalidate RSE invala ;;
mov ar.rsc = RSC_KERNEL // put RSE in eager mode ;;
alloc rT4 = ar.pfs,1,2,6,0 // keep in sync with entry point alloc
mov savedbrp = zero // setup bogus brp and pfs to mov savedpfs = zero // stop the debugger
PROLOGUE_END
//// Get page frame numbers for the PCR and PDR pages that were allocated by// the OS loader. Page directory is 4 physically contiguous pages.//
add rpT1 = LpbPrcb, rpLpb // -> PRCB dep.z rRR = UREGION_INDEX, RR_INDEX, RR_INDEX_LEN ;;
LDPTR (rPrcb, rpT1) // get processor block address movl rT2 = (START_PROCESS_RID << RR_RID)| RR_PS_VE ;;
//// set RR[0], Region ID (RID) = 1, Page Size (PS) = 8K, VHPT enabled (VE) = 1//
mov rr[rRR] = rT2 // initialize rr[0] movl rT1 = (START_SESSION_RID << RR_RID) | RR_PS_VE ;;
//// set RR[1]// movl rRR = SADDRESS_BASE // initialize ;;
mov rr[rRR] = rT1 // hydra region rr[1] ;;
//// set RR[4], Region ID (RID) = 0, Page Size (PS) = 64K, VHPT enabled (VE) = 0//
//// set RR[2] to RR[7], RID = KSEG3_RID, Page Size = 8K, VHPT disabled //
movl rRR = 2 << RR_INDEX movl rT2 = (KSEG3_RID << RR_RID) | (PAGE_SHIFT << RR_PS) ;;
mov rr[rRR] = rT2 // initialize rr[2] movl rRR = 3 << RR_INDEX ;;
mov rr[rRR] = rT2 // initialize rr[3] movl rRR = 4 << RR_INDEX ;;
mov rr[rRR] = rT2 // initialize rr[4] movl rRR = 5 << RR_INDEX ;;
mov rr[rRR] = rT2 // initialize rr[5] movl rRR = 6 << RR_INDEX ;;
mov rr[rRR] = rT2 // initialize rr[6]
//// Protection Key Registers//
mov rPKR = zero // pkr index = 0 mov rT1 = PKR_VALID // rr[0].v=1, pkr[0].key=0 mov rT2 = START_GLOBAL_RID ;;
mov pkr[rPKR] = rT1 add rPKR = 1, rPKR // increment PKR number shl rT2 = rT2, RR_RID ;;
or rT2 = rT1, rT2 ;;
mov pkr[rPKR] = rT2 // pkr[1].v=1, pkr[1].key=START_GLOBAL_RID add rPKR = 1, rPKR // increment PKR number movl rT2 = START_PROCESS_RID ;;
shl rT2 = rT2, RR_RID ;;
or rT2 = rT1, rT2 ;;
mov pkr[rPKR] = rT2 // pkr[1].v=1, pkr[1].key=START_GLOBAL_RID
add rPKR = 1, rPKR // increment PKR number mov rT2 = zero ;;
Ksb_PKRLoop:
mov pkr[rPKR] = rT2 // set PKR invalid add rPKR = 1, rPKR // increment PKR number ;;
cmp.gtu pt0 = PKRNUM, rPKR // at end?(pt0) br.cond.sptk.few.clr Ksb_PKRLoop ;;
//// Initialize debug registers//
mov rT1 = 0 ;;
Ksb_DbrLoop:
mov ibr[rT1] = r0 mov dbr[rT1] = r0 ;;
#ifndef NO_12241
srlz.d#endif
cmp.ne pt0 = 7, rT1
add rT1 = 1, rT1 (pt0) br.cond.sptk.few Ksb_DbrLoop ;;
//// Initialize control registers:// DCR// PSR pk, it, dt enabled//
ssm (1 << PSR_DI) | (1 << PSR_PP) | (1 << PSR_IC) | (1 << PSR_DFH) | (1 << PSR_AC) ;;
rsm (1 << PSR_PK) | (1 << PSR_MFH) // must clear the mfh bit ;;
srlz.i movl rT1 = DCR_INITIAL ;;
mov cr.dcr = rT1
//// Clear TC//// Set up ITR entry 2 with EPC page for system call//
movl rT4 = KiNormalSystemCall ptc.e zero add rpT1 = LpbKernelVirtualBase, rpLpb add rpT2 = LpbKernelPhysicalBase, rpLpb ;;
LDPTR (rT2, rpT1) // virtual load point LDPTR (rT3, rpT2) // physical load point shr rT4 = rT4, PAGE_SHIFT // page number for syscall page ;;
shr rT2 = rT2, PAGE_SHIFT // page number shr rT3 = rT3, PAGE_SHIFT // page number ;;
sub rT2 = rT4, rT2 // page offset movl rVa = MM_EPC_VA ;;
add rT3 = rT3, rT2 // compute pfn of syscall page
movl rT2 = TR_VALUE(1,0,7,0,1,1,0,1) ;;
shl rT3 = rT3, PAGE_SHIFT // set page number in TR ;;
or rT2 = rT2, rT3 mov rT3 = ITR_EPC_INDEX ;;
//// Clear PSR.IC bit//
add rpT1 = LpbPcrPage2, a0 ;;
ld8 rPcr2Pfn = [rpT1] // set second PCR page mov rT1 = PAGE_SHIFT << IDTR_PS
rsm 1 << PSR_IC // PSR.ic = 0 ;;
srlz.d
mov cr.ifa = rVa // virtual address of epc page mov cr.itir = rT1 ;;
itr.i itr[rT3] = rT2
movl rVa = KiPcr2 // set virtual address of PCR ;;
mov cr.ifa = rVa // setup IFA for insert movl rPcrTr = KIPCR_TR_INITIAL // PCR translation except for PPN
mov cr.itir = rT1 // setup IDTR mov rT2 = DTR_KIPCR2_INDEX shl rPcr2Pfn = rPcr2Pfn, PAGE_SHIFT // shift to PPN field ;;
or rPcrTr = rPcr2Pfn, rPcrTr // form full TR ;;
itr.d dtr[rT2] = rPcrTr // insert PCR TR to DTR
ssm 1 << PSR_IC // PSR.ic = 1 ;;
srlz.i // I serialize
//// Set the cache policy for cached memory.// **** TBD ****
//// Set the first level data and instruction cache fill size and size.//// **** TBD
//// Set the second level data and instruction cache fill size and size.//// ***** TBD
//// Set the data cache fill size and alignment values.//// **** TBD
//// Set the instruction cache fill size and alignment values.//// **** TBD
//// Sweep the data and instruction caches.//// **** TBD
//// Initialize the fixed entries that map the PDR pages.// Setup page directory, pte's for page dir// **** TBD ****//
//// Initialize the Processor Control Registers (PCR).//
//// Initialize the minor and major version numbers.//
mov rT1 = PCR_MINOR_VERSION // set minor version number movl rpPcr = KiPcr // get PCR address ;;
add rpT1 = PcMinorVersion, rpPcr add rpT2 = PcMajorVersion, rpPcr mov rT2 = PCR_MAJOR_VERSION // set major version number ;;
st2 [rpT1] = rT1 // store minor st2 [rpT2] = rT2 // store major add rpT3 = PcPrcb, rpPcr // -> PCR.Prcb ;;
//// Set address of processor block.//
st8 [rpT3] = rPrcb // store Prcb address
//// Initialize the addresses of various data structures that are referenced// from the exception and interrupt handling code.//// N.B. The panic stack is a separate stack that is used when the current// kernel stack overlfows.//
add rpT1 = PcInitialStack,rpPcr // -> initial kernel stack address in PCR add rpT2 = LpbPanicStack, rpLpb // -> lpb panic stack address
add rpT3 = PcPanicStack, rpPcr // -> panic stack address in PCR ;;
LDPTRINC (rT2, rpT2, LpbThread-LpbPanicStack) // panic stack address
st8 [rpT1] = rKstack, PcKernelGP-PcInitialStack ;;
LDPTR (rThread, rpT2) // -> current (idle) thread st8 [rpT3] = rT2, PcCurrentThread-PcPanicStack // set PCR panic stack address ;;
st8 [rpT3] = rThread // set PCR current thread st8 [rpT1] = gp // save GP mov rT1 = HIGH_LEVEL ;;
SET_IRQL(rT1) // Set to highest IRQL
//// Clear floating status and zero the count and compare registers.//
mov ar.ccv = zero movl rT1 = FPSR_FOR_KERNEL ;;
mov ar.fpsr = rT1 mov ar.ec = zero mov ar.lc = zero
//// Set system dispatch address limits used by get and set context.// ***** TBD ******
//// Set the default cache error routine address.// ****** TBD *******
//// Sweep the data and instruction caches.// **** TBD *******
//// Setup arguments and call kernel initialization routine.//
add rpT1 = LpbProcess, rpLpb // -> idle process address add rpT2 = PbNumber, rPrcb mov out3 = rPrcb // arg 4 is current PRCB ;;
LDPTR (out0, rpT1) // arg 1 is process mov out1 = rThread // arg 2 is thread mov out2 = rKstack // arg 3 is kernel stack
ld1 out4 = [rpT2] // get processor number mov out5 = rpLpb // arg 6 is pointer to LPB br.call.sptk.many.clr brp = KiInitializeKernel ;; // (C code)
alloc t0 = ar.pfs,0,0,0,0 mov brp = zero // setup a bogus brp to stop debugger br KiIdleLoop // branch to KIIdleLoop() ;;
//// Never get to this point!// NESTED_EXIT(KiSystemBegin)// //++//// VOID// KiIdleLoop (// VOID// )//// Routine Description://// This is the idle loop for NT. This code runs in a thread for// each processor in the system. The idle thread runs at IRQL// DISPATCH_LEVEL and polls for work.//// Arguments://// None.//// Return Value://// None. (This routine never returns).//// When another thread is selected to run, SwapContext is called.// Normally, SwapContext saves and restores the non-volatile context.// The idle loop never returns so the preserved registers of the caller// do not need to be saved.// In other architectures, the idle loop pre-initializes the storage area// (switch frame) where SwapContext would normally save the preserved// registers with values that the idle loop needs// in those registers upon return from SwapContext and skips over the// register save on the way into SwapContext (alternate entry point// SwapFromIdle).// In this design the idle loop registers are preserved in// the register stack which is saved in the kernel backing store for the// idle thread. This allows us to skip the restore in SwapContext (not yet// implemented).//// All callers to SwapContext pass the following arguments://// -- s0 = Prcb// -- s1 = current (previous) thread// -- s2 = new (next) thread//// Idle also enters SwapContext at SwapFromIdle with sp pointing to the switch// frame for preserved state.//// Since all registers used by the idle are saved in the register stack,// no registers need be recomputed on return from SwapContext.////--
NESTED_ENTRY(KiIdleLoop) NESTED_SETUP(0,6,2,0)
//// allocate and build switch frame//
.fframe SwitchFrameLength add sp = -SwitchFrameLength, sp ;;
add t0 = ExFltS3+SwExFrame+STACK_SCRATCH_AREA, sp add t1 = ExFltS2+SwExFrame+STACK_SCRATCH_AREA, sp ;;
.save.f 0xC stf.spill [t0] = fs3, ExFltS1-ExFltS3 // save fs3 stf.spill [t1] = fs2, ExFltS0-ExFltS2 // save fs2 mov t10 = bs4 ;;
.save.f 0x3 stf.spill [t0] = fs1, ExIntS3-ExFltS1 // save fs1 stf.spill [t1] = fs0, ExIntS2-ExFltS0 // save fs0 mov t11 = bs3 ;;
.save.g 0xC .mem.offset 0,0 st8.spill [t0] = s3, ExIntS1-ExIntS3 // save s3 .mem.offset 8,0 st8.spill [t1] = s2, ExIntS0-ExIntS2 // save s2 mov t12 = bs2 ;;
.save.g 0x3 .mem.offset 0,0 st8.spill [t0] = s1, ExBrS4-ExIntS1 // save s1 .mem.offset 8,0 st8.spill [t1] = s0, ExBrS3-ExIntS0 // save s0 mov t13 = bs1 ;;
.save.b 0x18 st8 [t0] = t10, ExBrS2-ExBrS4 // save bs4 st8 [t1] = t11, ExBrS1-ExBrS3 // save bs3 mov t4 = ar.unat // captured Nats of s0-s3 ;;
.save.b 0x6 st8 [t0] = t12, ExBrS0-ExBrS2 // save bs2 st8 [t1] = t13, ExApEC-ExBrS1 // save bs1 mov t14 = bs0 ;;
.save.b 0x1 st8 [t0] = t14, ExApLC-ExBrS0 // save bs0 .savepsp ar.pfs, ExceptionFrameLength-ExApEC-STACK_SCRATCH_AREA st8 [t1] = t16, ExIntNats-ExApEC mov t15 = ar.lc ;;
.savepsp ar.lc, ExceptionFrameLength-ExApLC-STACK_SCRATCH_AREA st8 [t0] = t15 .savepsp @priunat, ExceptionFrameLength-ExIntNats-STACK_SCRATCH_AREA st8 [t1] = t4 // save Nats of s0-s3 nop.i 0 ;;
PROLOGUE_END
//// Register aliases//
rpT1 = t0 rpT2 = t1 rpT3 = t2 rT1 = t3 rT2 = t4 rT3 = t5
#if !defined(NT_UP)
rpNumProc = t7 rpBWait = t8 rpDispLock = t9#endif // !defined(NT_UP)
rpNextTh = t10
#if DBG
rDbgCount = t11 rKdEnable = t12#endif //DBG
pEmty = pt1 pIdle = pt2
#if !defined(NT_UP)
pLoop = pt6#endif // !defined(NT_UP)
#if DBG
pBrk = ps2 pNotZero = ps3#endif // DBG
rpHPI = loc2 rHalGP = loc3 rKerGP = loc4
#if !defined(NT_UP)
rProcNum = loc5#endif // !defined(NT_UP)
// // Initialize SwitchFPSR, SwitchPFS, SwitchRp in the switch frame //
mov rT3 = ar.bsp movl rT2 = KiIdleReturn
add rpT1 = SwPFS+STACK_SCRATCH_AREA, sp mov rKerGP = gp // save the kernel's gp mov rT1 = 0x308 // must match the values specified // by the alloc instruction at // the entry of the KiIdleLoop ;;
st8.nta [rpT1] = rT1, SwRp-SwPFS // set pfs in the switch frame add rT3 = 0x30, rT3 // 6 local registers ;;
st8.nta [rpT1] = rT2, SwFPSR-SwRp // set brp in the switch frame movl rT1 = FPSR_FOR_KERNEL ;;
extr.u rpT3 = rT3, 0, 9 st8.nta [rpT1] = rT1, SwRnat-SwFPSR ;;
cmp.gtu pt1 = 0x30, rpT3 // Is there a slot for NAT bits? st8.nta [rpT1] = zero, SwBsp-SwRnat ;;
(pt1) add rT3 = 8, rT3 // Adjust for NAT bits. ;;
st8.nta [rpT1] = rT3 movl rpT1 = KiPcr + PcPrcb ;;
//// In a multiprocessor system the boot processor proceeds directly into// the idle loop. As other processors start executing, however, they do// not directly enter the idle loop and spin until all processors have// been started and the boot master allows them to proceed.//
//// Setup initial idle loop register values//
LDPTRINC (s0, rpT1, PcCurrentThread-PcPrcb) // address of PRCB add rpT2 = @gprel(__imp_HalProcessorIdle), gp ;;
LDPTR (s2, rpT1) // idle thread LDPTR (rpT2, rpT2) // -> function pointer add rpT3 = PbNumber, s0 ;;
ld1 rProcNum = [rpT3] ld8 rpHPI = [rpT2], PlGlobalPointer-PlEntryPoint // entry point ;;
//// Control reaches here with IRQL at HIGH_LEVEL. Lower IRQL to// DISPATCH_LEVEL and set wait IRQL of idle thread.//
ld8 rHalGP = [rpT2] // Hal GP add rpT1 = ThWaitIrql, s2 // -> thread WaitIrql mov out0 = DISPATCH_LEVEL // get dispatch level IRQL ;;
st1 [rpT1] = out0 // set wait IRQL of idle thread br.call.sptk.few.clr brp = KeLowerIrql // call KeLowerIrql(IRQL) ;;
FAST_ENABLE_INTERRUPTS mov gp = rKerGP ;;
//// In a multiprocessor system the boot processor proceeds directly into// the idle loop. As other processors start executing, however, they do// not directly enter the idle loop and spin until all processors have// been started and the boot master allows them to proceed.//
#if !defined(NT_UP)
add rpBWait = @gprel(KiBarrierWait), gp ;;
Kil_WaitLoop: ld4 rT1 = [rpBWait] // get barrier wait value ;;
cmp.ne pLoop = zero, rT1 // loop if not zero(pLoop) br.dpnt.few.clr Kil_WaitLoop // spin until allowed to proceed
#endif // !defined(NT_UP)
KiIdleReturn:
mov s1 = s2 // s1 <- IdleThread
#if DBG
mov rDbgCount = 20 * 1000 // set breakin loop counter
#endif // DBG
;;
KiIdleSwitchBlocked: mov rT1 = DISPATCH_LEVEL ;;
SET_IRQL(rT1)
//// The following loop is executed for the life of the system.//
Kil_TopOfIdleLoop::
mov gp = rKerGP // restore gp
//// If processor 0, check for debugger breakin, otherwise just check for// DPCs again.//
#if DBG
#if !defined(NT_UP)
cmp4.ne pNotZero = zero, rProcNum // pNotZero = not processor zero(pNotZero) br.cond.dptk.few.clr Kil_CheckDpcList // br if not processor zero
#endif // !defined(NT_UP)
//// Check if the debugger is enabled, and whether it is time to poll// for a debugger breakin. (This check is only performed on cpu 0).//
sub rDbgCount = rDbgCount,zero,1 // decrement poll counter ;;
add rKdEnable = @gprel(KdDebuggerEnabled), gp cmp.eq pBrk = rDbgCount, zero // zero yet? ;;
(pBrk) ld1 rKdEnable = [rKdEnable] // check if debugger enabled(pBrk) mov rDbgCount = 20 * 1000 // set breakin loop counter ;;
(pBrk) cmp.ne pBrk = rKdEnable, zero // pBrk = 1 if Kd enabled(pBrk) br.call.dpnt.few.clr brp=KdPollBreakIn // check if breakin requested ;;
mov gp = rKerGP // restore gp(pBrk) cmp.ne pBrk = v0, zero // ne => break in requested mov out0 = DBG_STATUS_CONTROL_C(pBrk) br.call.sptk brp = DbgBreakPointWithStatus ;;
mov gp = rKerGP // restore gp#endif // DBG
//// Disable interrupts and check if there is any work in the DPC list.//
Kil_CheckDpcList:
//// Process the deferred procedure call list for the current processor.//
FAST_ENABLE_INTERRUPTS // give interrupts a chance ;;
srlz.d add rpT1 = PbDpcQueueDepth, s0 add rpNextTh = PbNextThread, s0 // -> next thread ;;
FAST_DISABLE_INTERRUPTS // disable interrupts ;;
ld4.nta rT1 = [rpT1] mov out0 = s0 // PRCB ;;
cmp4.eq pt0, pt1 = rT1, zero // if eq, queue empty movl rpT1 = KiPcr+PcDispatchInterrupt ;;
(pt1) st1 [rpT1] = zero // clear dispatch interrupt req (pt0) br.cond.dpnt Kil_CheckNextThread (pt1) br.call.sptk.few.clr brp = KiRetireDpcList ;;
add rpNextTh = PbNextThread, s0 // -> next thread mov gp = rKerGP // restore gp#if DBG
mov rDbgCount = 20 * 1000 // set breakin loop counter#endif // DBG
;;
//// Check if a thread has been selected to run on this processor//
Kil_CheckNextThread:
ld8 s2 = [rpNextTh] // next thread mov rT1 = SYNCH_LEVEL ;;
cmp.eq pIdle = s2, zero // if no thread to run(pIdle) br.dpnt.few.clr Kil_Idle // br to Idle
//// A thread has been selected for execution on this processor. Acquire// the context swap lock, get the thread address again (it may have// changed), clear the address of the next thread in the processor block,// and call swap context to start execution of the selected thread.//
SET_IRQL(rT1)
FAST_ENABLE_INTERRUPTS
#if !defined(NT_UP)
add out0 = PbLockQueue + (LockQueueContextSwapLock * 2 * 8), s0 add s2 = PbNextThread, s0 // -> next thread br.call.sptk brp = KeAcquireQueuedSpinLockAtDpcLevel ;;
//// Reread the next thread because it may be changed in a MP system.//// The selected thread may be blocked from switching at this time// if it is being scheduled on this processor because it is being// removed from another processor. The switch is blocked until// the thread is completely removed from the other processor. In// this case, drop the context swap lock and continue execution as// if resuming from a context switch. (The release below returns// to KiIdleSwitchBlocked above).//
ld8 s2 = [s2] // reread next thread movl rpT2 = KiIdleSwitchBlocked ;;
add rpT1 = ThIdleSwapBlock, s2 // &NewThread->IdleSwapBlock mov brp = rpT2 cmp.eq pt0 = s2, s1 // check for swap idle to idle ;;
ld1 rT1 = [rpT1], ThState-ThIdleSwapBlock add out0 = PbLockQueue + (LockQueueContextSwapLock * 2 * 8), s0(pt0) br.dpnt.few.clr Kil_Idle2Idle // rare case, idle to idle ;;
cmp.ne pIdle = rT1, zero add rpT2 = PbCurrentThread, s0 // -> address of current thread(pIdle) br.call.spnt bt0 = KeReleaseQueuedSpinLockFromDpcLevel ;;
#else
add rpT2 = PbCurrentThread, s0 // -> address of current thread add rpT1 = ThState, s2 ;;
#endif // !defined(NT_UP)
// set new thread as current st8 [rpT2] = s2, PbNextThread-PbCurrentThread mov rT1 = Running ;;
st1 [rpT1] = rT1 // set new thread state to running st8.rel [rpT2] = zero // clear address of next thread
//// Swap context to new thread// (returns to KiIdleReturn above).//
br.call.sptk.few.clr brp = SwapFromIdle ;;
//// There are no entries in the DPC list and a thread has not been selected// for execution on this processor. Call the HAL so power managment can be// performed.//// N.B. The HAL is called with interrupts disabled. The HAL will return// with interrupts enabled.//
Kil_Idle: mov bt0 = rpHPI movl rT1 = Kil_TopOfIdleLoop ;;
mov gp = rHalGP // set Hal GP mov brp = rT1 br.call.dpnt.few.clr bt1 = bt0 // call HalProcessorIdle ;; // does not return here.
//// In the event that a thread was scheduled to run on this processor// but before the idle loop picked it up, it was made inelligible for// this processor and there is no other thread to run, the idle thread// will have been selected as the NextThread for this processor and// this processor will have been marked idle in KiIdleSummary.//// It is then possible for another thread to be selected for this processor// between the time the idle loop picks up the NextThread field and clears// it.//// To avoid this rare case, if the switch is from the idle thread to the// idle thread, we need to drop the context swap lock, acquire the // dispatcher lock and if the next thread field is still the idle thread,// clear it and continue to idle. If it is no longer the idle thread,// switch to that thread.//
Kil_Idle2Idle: add s2 = PbNextThread, s0 // get &Prcb->NextThread br.call.sptk brp = KeReleaseQueuedSpinLockFromDpcLevel ;;
add out0 = PbLockQueue + (LockQueueDispatcherLock * 2 * 8), s0 br.call.sptk brp = KeAcquireQueuedSpinLockAtDpcLevel ;;
add out0 = PbLockQueue + (LockQueueDispatcherLock * 2 * 8), s0 ld8 rT1 = [s2] // get Prcb->NextThread ;;
cmp.eq pt0 = rT1, s2 // check if still Idle Thread ;;
(pt0) st8 [s2] = zero // clear Prcb->NextThread br.call.sptk brp = KeReleaseQueuedSpinLockFromDpcLevel ;;
br KiIdleSwitchBlocked // loop.
NESTED_EXIT(KiIdleLoop) #if !defined(NT_UP)
//++// Routine://// VOID// KiOSRendezvous (// )//// Routine Description://// OS rendezvous entry point called from SAL for MP boot.// Establish kernel mapping and rfi to KiInitializeSystem with// translation turned on.//// Arguments://// Return Value://// None.////--
.global MmSystemParentTablePage .global MiNtoskrnlPhysicalBase .global MiNtoskrnlVirtualBase .global MiNtoskrnlPageShift
LEAF_ENTRY(KiOSRendezvous)
mov t5 = ip // get the physical addr for KiOSRendezvous
mov psr.l = zero // initialize psr.l movl t0 = KSEG0_BASE ;;
mov ar.rsc = zero // invalidate register stack mov t1 = (START_GLOBAL_RID << RR_RID) | (PAGE_SHIFT << RR_PS) | (1 << RR_VE) ;;
//// Initialize Region Register for kernel//
loadrs mov rr[t0] = t1
//// Setup translation for kernel/hal binary.// movl t0 = KSEG0_BASE;
;;
movl t2 = MiNtoskrnlPhysicalBase movl t4 = MiNtoskrnlPageShift movl t0 = MiNtoskrnlVirtualBase movl t3 = KiOSRendezvous ;;
sub t6 = t2, t3 sub t7 = t4, t3 sub t0 = t0, t3 ;;
add t6 = t5, t6 // get a physical addr for MiNtoskrnlPhysicalBase add t7 = t5, t7 // get a physical addr for MiNtoskrnlPageShift add t0 = t5, t0 // get a physical addr for MiNtoskrnlVirtualBase ;;
ld8 t6 = [t6] ld4 t7 = [t7] ld8 t0 = [t0] movl t8 = VALID_KERNEL_EXECUTE_PTE ;;
mov cr.ifa = t0 or t2 = t6, t8 shl t1 = t7, PS_SHIFT ;;
mov cr.itir = t1 mov t3 = DTR_KERNEL_INDEX ;;
itr.d dtr[t3] = t2 ;;
itr.i itr[t3] = t2
//// Setup VHPT//
movl t0 = KiIA64PtaContents movl t3 = KiOSRendezvous ;;
sub t6 = t0, t3 ;;
add t6 = t5, t6 ;;
ld8 t6 = [t6] ;;
mov cr.pta = t6
//// Turn on address translation// movl t1 = (1 << PSR_BN) | (1 << PSR_IT) | (1 << PSR_DA) | (1 << PSR_RT) | (1 << PSR_DT) | (1 << PSR_IC) ;;
mov cr.ipsr = t1
//// Branch to KiInitializeSystem//// Need to do a "rfi" in order set "it" bits in the PSR.// This is the only way to set them.// movl t0 = KiOSRendezvousStub ;;
mov cr.iip = t0 ;;
rfi ;;
.global KeLoaderBlock
KiOSRendezvousStub:
alloc t0 = 0,0,1,0 movl gp = _gp mov t9 = PAGE_SHIFT << PS_SHIFT movl t8 = KADDRESS_BASE ;;
//// Set up the VHPT table//
thash t8 = t8 add t7 = @gprel(MmSystemParentTablePage), gp ;;
ld8 t7 = [t7] rsm 1 << PSR_IC // PSR.ic = 0 ;;
srlz.d
thash t8 = t8 movl t6 = PDR_TR_INITIAL ;;
//// Install DTR for the kernel parent page table//
thash t8 = t8 mov t10 = DTR_KTBASE_INDEX shl t7 = t7, PAGE_SHIFT ;;
mov cr.ifa = t8 or t7 = t7, t6 mov cr.itir = t9 ;;
itr.d dtr[t10] = t7
ssm 1 << PSR_IC // PSR.ic = 1 ;;
srlz.i // I serialize add out0 = @gprel(KeLoaderBlock), gp ;;
ld8 out0 = [out0] // dereference pointer movl t0 = KiInitializeSystem ;;
mov bt0 = t0 br.call.sptk brp = bt0 // branch to entry point
LEAF_EXIT(KiOSRendezvous)
#endif // !defined(NT_UP)
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