mirror of
https://github.com/reactos/reactos.git
synced 2024-11-18 21:13:52 +00:00
146 lines
3.2 KiB
ArmAsm
146 lines
3.2 KiB
ArmAsm
/*
|
|
* PROJECT: ReactOS Kernel
|
|
* LICENSE: BSD - See COPYING.ARM in the top level directory
|
|
* FILE: ntoskrnl/ke/arm/ctxswtch.s
|
|
* PURPOSE: Context Switch and Idle Thread on ARM
|
|
* PROGRAMMERS: Timo Kreuzer (timo.kreuzer@reactos.org)
|
|
* ReactOS Portable Systems Group
|
|
*/
|
|
|
|
#include <ksarm.h>
|
|
|
|
IMPORT KeLowerIrql
|
|
|
|
TEXTAREA
|
|
|
|
/*!
|
|
* \name KiSwapContextInternal
|
|
*
|
|
* \brief
|
|
* The KiSwapContextInternal routine switches context to another thread.
|
|
*
|
|
* \param r0
|
|
* Pointer to the KTHREAD to which the caller wishes to switch to.
|
|
*
|
|
* \param r1
|
|
* Pointer to the KTHREAD to which the caller wishes to switch from.
|
|
*
|
|
* \param r2
|
|
* APC bypass
|
|
*
|
|
* \return
|
|
* None.
|
|
*
|
|
* \remarks
|
|
* ...
|
|
*
|
|
*--*/
|
|
NESTED_ENTRY KiSwapContextInternal
|
|
|
|
/* Push a KSWITCH_FRAME on the stack */
|
|
stmdb sp!,{r2,r3,r11,lr} // FIXME: what is the 2nd field?
|
|
// PROLOG_PUSH {r2,r3,r11,lr}
|
|
|
|
PROLOG_END KiSwapContextInternal
|
|
|
|
/* Save kernel stack of old thread */
|
|
str sp, [r1, #ThKernelStack]
|
|
|
|
/* Save new thread in R11 */
|
|
mov r11, r0
|
|
|
|
//bl KiSwapContextSuspend
|
|
__debugbreak
|
|
|
|
/* Load stack of new thread */
|
|
ldr sp, [r11, #ThKernelStack]
|
|
|
|
/* Reload APC bypass */
|
|
ldr r2, [sp, #SwApcBypass]
|
|
|
|
//bl KiSwapContextResume
|
|
__debugbreak
|
|
|
|
/* Restore R2, R11 and return */
|
|
ldmia sp!,{r2,r3,r11,pc}
|
|
|
|
NESTED_END KiSwapContextInternal
|
|
|
|
|
|
/*!
|
|
* KiSwapContext
|
|
*
|
|
* \brief
|
|
* The KiSwapContext routine switches context to another thread.
|
|
*
|
|
* BOOLEAN
|
|
* KiSwapContext(
|
|
* _In_ KIRQL WaitIrql,
|
|
* _Inout_ PKTHREAD CurrentThread);
|
|
*
|
|
* \param WaitIrql <r0>
|
|
* ...
|
|
*
|
|
* \param CurrentThread <r1>
|
|
* Pointer to the KTHREAD of the current thread.
|
|
*
|
|
* \return
|
|
* The WaitStatus of the Target Thread.
|
|
*
|
|
* \remarks
|
|
* This is a wrapper around KiSwapContextInternal which will save all the
|
|
* non-volatile registers so that the Internal function can use all of
|
|
* them. It will also save the old current thread and set the new one.
|
|
*
|
|
* The calling thread does not return after KiSwapContextInternal until
|
|
* another thread switches to it.
|
|
*
|
|
*--*/
|
|
NESTED_ENTRY KiSwapContext
|
|
|
|
/* Push non-volatiles and return address on the stack */
|
|
stmdb sp!,{r4,r5,r6,r7,r8,r9,r10,r11,lr}
|
|
// PROLOG_PUSH {r4,r5,r6,r7,r8,r9,r10,r11,lr}
|
|
|
|
PROLOG_END KiSwapContext
|
|
|
|
/* Do the swap with the registers correctly setup */
|
|
mov32 r0, 0xFFDFF000 // FIXME: properly load the PCR into r0 (PCR should be in CP15, c3, TPIDRPRW)
|
|
ldr r0, [r0, #PcCurrentThread] /* Pointer to the new thread */
|
|
bl KiSwapContextInternal
|
|
|
|
/* Restore non-volatiles and return */
|
|
ldmia sp!,{r4,r5,r6,r7,r8,r9,r10,r11,pc}
|
|
|
|
NESTED_END KiSwapContext
|
|
|
|
|
|
|
|
NESTED_ENTRY KiThreadStartup
|
|
PROLOG_END KiThreadStartup
|
|
|
|
/* Lower IRQL to APC_LEVEL */
|
|
mov a1, #1
|
|
bl KeLowerIrql
|
|
|
|
/* Set the start address and startup context */
|
|
mov a1, r6
|
|
mov a2, r5
|
|
blx r7
|
|
|
|
/* The function must not return! */
|
|
__assertfail
|
|
|
|
NESTED_END KiThreadStartup
|
|
|
|
|
|
NESTED_ENTRY KiSwitchThreads
|
|
PROLOG_END KiSwitchThreads
|
|
|
|
// UNIMPLEMENTED!
|
|
__debugbreak
|
|
|
|
NESTED_END KiSwitchThreads
|
|
|
|
END
|
|
/* EOF */
|