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107 lines
2.3 KiB
ArmAsm
107 lines
2.3 KiB
ArmAsm
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: ntoskrnl/ke/i386/ctxswitch.S
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* PURPOSE: Thread Context Switching
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*
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* PROGRAMMERS: Alex Ionescu (alex@relsoft.net)
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* Gregor Anich (FPU Code)
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*/
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/* INCLUDES ******************************************************************/
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#include <asm.inc>
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#include <ks386.inc>
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EXTERN @KiSwapContextEntry@8:PROC
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EXTERN @KiSwapContextExit@8:PROC
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EXTERN @KiRetireDpcList@4:PROC
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EXTERN @KiEnterV86Mode@4:PROC
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EXTERN @KiExitV86Mode@4:PROC
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/* FUNCTIONS ****************************************************************/
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.code
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PUBLIC @KiSwapContextInternal@0
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@KiSwapContextInternal@0:
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/* Build switch frame */
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sub esp, 2 * 4
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mov ecx, esp
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jmp @KiSwapContextEntry@8
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PUBLIC @KiSwapContext@8
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@KiSwapContext@8:
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/* Save 4 registers */
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sub esp, 4 * 4
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/* Save all the non-volatile ones */
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mov [esp+12], ebx
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mov [esp+8], esi
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mov [esp+4], edi
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mov [esp+0], ebp
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/* Get the wait IRQL */
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or dl, cl
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/* Do the swap with the registers correctly setup */
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call @KiSwapContextInternal@0
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/* Return the registers */
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mov ebp, [esp+0]
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mov edi, [esp+4]
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mov esi, [esp+8]
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mov ebx, [esp+12]
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/* Clean stack */
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add esp, 4 * 4
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ret
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PUBLIC @KiSwitchThreads@8
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@KiSwitchThreads@8:
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/* Load the new kernel stack and switch OS to new thread */
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mov esp, edx
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call @KiSwapContextExit@8
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/* Now we're on the new thread. Return to the caller to restore registers */
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add esp, 2 * 4
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ret
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PUBLIC @KiRetireDpcListInDpcStack@8
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@KiRetireDpcListInDpcStack@8:
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/* Switch stacks and retire DPCs */
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mov eax, esp
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mov esp, edx
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push eax
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call @KiRetireDpcList@4
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/* Return on original stack */
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pop esp
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ret
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/* FIXFIX: Move to C code ****/
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PUBLIC _Ki386SetupAndExitToV86Mode@4
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_Ki386SetupAndExitToV86Mode@4:
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/* Enter V8086 mode */
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pushad
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sub esp, (12 + KTRAP_FRAME_LENGTH + NPX_FRAME_LENGTH)
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mov ecx, esp
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call @KiEnterV86Mode@4
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jmp $
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PUBLIC @Ki386BiosCallReturnAddress@4
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@Ki386BiosCallReturnAddress@4:
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/* Exit V8086 mode */
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call @KiExitV86Mode@4
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mov esp, eax
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add esp, (12 + KTRAP_FRAME_LENGTH + NPX_FRAME_LENGTH)
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popad
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ret 4
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END
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