mirror of
https://github.com/reactos/reactos.git
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147 lines
3.2 KiB
ArmAsm
147 lines
3.2 KiB
ArmAsm
/*
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* PROJECT: ReactOS Kernel
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* LICENSE: BSD - See COPYING.ARM in the top level directory
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* FILE: ntoskrnl/ke/arm/ctxswtch.s
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* PURPOSE: Context Switch and Idle Thread on ARM
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* PROGRAMMERS: Timo Kreuzer (timo.kreuzer@reactos.org)
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* ReactOS Portable Systems Group
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*/
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#include <ksarm.h>
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IMPORT KeLowerIrql
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TEXTAREA
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/*!
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* \name KiSwapContextInternal
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*
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* \brief
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* The KiSwapContextInternal routine switches context to another thread.
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*
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* \param r0
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* Pointer to the KTHREAD to which the caller wishes to switch to.
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*
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* \param r1
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* Pointer to the KTHREAD to which the caller wishes to switch from.
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*
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* \param r2
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* APC bypass
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*
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* \return
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* None.
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*
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* \remarks
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* ...
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*
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*--*/
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NESTED_ENTRY KiSwapContextInternal
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/* Push a KSWITCH_FRAME on the stack */
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stmdb sp!,{r2,r3,r11,lr} // FIXME: what is the 2nd field?
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// PROLOG_PUSH {r2,r3,r11,lr}
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PROLOG_END KiSwapContextInternal
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/* Save kernel stack of old thread */
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str sp, [r1, #ThKernelStack]
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/* Save new thread in R11 */
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mov r11, r0
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//bl KiSwapContextSuspend
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__debugbreak
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/* Load stack of new thread */
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ldr sp, [r11, #ThKernelStack]
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/* Reload APC bypass */
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ldr r2, [sp, #SwApcBypass]
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//bl KiSwapContextResume
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__debugbreak
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/* Restore R2, R11 and return */
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ldmia sp!,{r2,r3,r11,pc}
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NESTED_END KiSwapContextInternal
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/*!
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* KiSwapContext
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*
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* \brief
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* The KiSwapContext routine switches context to another thread.
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*
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* BOOLEAN
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* KiSwapContext(
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* _In_ KIRQL WaitIrql,
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* _Inout_ PKTHREAD CurrentThread);
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*
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* \param WaitIrql <r0>
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* ...
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*
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* \param CurrentThread <r1>
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* Pointer to the KTHREAD of the current thread.
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*
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* \return
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* The WaitStatus of the Target Thread.
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*
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* \remarks
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* This is a wrapper around KiSwapContextInternal which will save all the
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* non-volatile registers so that the Internal function can use all of
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* them. It will also save the old current thread and set the new one.
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*
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* The calling thread does not return after KiSwapContextInternal until
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* another thread switches to it.
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*
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*--*/
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NESTED_ENTRY KiSwapContext
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/* Push non-volatiles and return address on the stack */
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stmdb sp!,{r4,r5,r6,r7,r8,r9,r10,r11,lr}
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// PROLOG_PUSH {r4,r5,r6,r7,r8,r9,r10,r11,lr}
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PROLOG_END KiSwapContext
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/* Do the swap with the registers correctly setup */
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mov32 r0, 0xFFDFF000 // FIXME: properly load the PCR into r0 (PCR should be in CP15, c3, TPIDRPRW)
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ldr r0, [r0, #PcCurrentThread] /* Pointer to the new thread */
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bl KiSwapContextInternal
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/* Restore non-volatiles and return */
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ldmia sp!,{r4,r5,r6,r7,r8,r9,r10,r11,pc}
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NESTED_END KiSwapContext
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NESTED_ENTRY KiThreadStartup
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PROLOG_END KiThreadStartup
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/* Lower IRQL to APC_LEVEL */
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mov a1, #1
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bl KeLowerIrql
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/* Set the start address and startup context */
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mov a1, r6
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mov a2, r5
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blx r7
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/* The function must not return! */
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__assertfail
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NESTED_END KiThreadStartup
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NESTED_ENTRY KiSwitchThreads
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PROLOG_END KiSwitchThreads
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// UNIMPLEMENTED!
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__debugbreak
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NESTED_END KiSwitchThreads
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END
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/* EOF */
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