mirror of
https://github.com/reactos/reactos.git
synced 2024-11-09 08:08:38 +00:00
162 lines
3.4 KiB
ArmAsm
162 lines
3.4 KiB
ArmAsm
/*
|
|
* COPYRIGHT: See COPYING in the top level directory
|
|
* PROJECT: ReactOS kernel
|
|
* FILE: ntoskrnl/ke/i386/ctxswitch.S
|
|
* PURPOSE: Thread Context Switching
|
|
*
|
|
* PROGRAMMERS: Alex Ionescu (alex@relsoft.net)
|
|
* Gregor Anich (FPU Code)
|
|
*/
|
|
|
|
/* INCLUDES ******************************************************************/
|
|
|
|
#include <asm.inc>
|
|
#include <ks386.inc>
|
|
|
|
EXTERN @KiSwapContextEntry@8:PROC
|
|
EXTERN @KiSwapContextExit@8:PROC
|
|
EXTERN @KiRetireDpcList@4:PROC
|
|
EXTERN @KiEnterV86Mode@4:PROC
|
|
EXTERN @KiExitV86Mode@4:PROC
|
|
|
|
/* FUNCTIONS ****************************************************************/
|
|
.code
|
|
|
|
PUBLIC @KiSwapContextInternal@0
|
|
@KiSwapContextInternal@0:
|
|
/* Build switch frame */
|
|
sub esp, 2 * 4
|
|
mov ecx, esp
|
|
jmp @KiSwapContextEntry@8
|
|
|
|
|
|
PUBLIC @KiSwapContext@8
|
|
@KiSwapContext@8:
|
|
/* Save 4 registers */
|
|
sub esp, 4 * 4
|
|
|
|
/* Save all the non-volatile ones */
|
|
mov [esp+12], ebx
|
|
mov [esp+8], esi
|
|
mov [esp+4], edi
|
|
mov [esp+0], ebp
|
|
|
|
/* Get the wait IRQL */
|
|
or dl, cl
|
|
|
|
/* Do the swap with the registers correctly setup */
|
|
call @KiSwapContextInternal@0
|
|
|
|
/* Return the registers */
|
|
mov ebp, [esp+0]
|
|
mov edi, [esp+4]
|
|
mov esi, [esp+8]
|
|
mov ebx, [esp+12]
|
|
|
|
/* Clean stack */
|
|
add esp, 4 * 4
|
|
ret
|
|
|
|
|
|
PUBLIC @KiSwitchThreads@8
|
|
@KiSwitchThreads@8:
|
|
/* Load the new kernel stack and switch OS to new thread */
|
|
mov esp, edx
|
|
call @KiSwapContextExit@8
|
|
|
|
/* Now we're on the new thread. Return to the caller to restore registers */
|
|
add esp, 2 * 4
|
|
ret
|
|
|
|
|
|
PUBLIC @KiRetireDpcListInDpcStack@8
|
|
@KiRetireDpcListInDpcStack@8:
|
|
/* Switch stacks and retire DPCs */
|
|
mov eax, esp
|
|
mov esp, edx
|
|
push eax
|
|
call @KiRetireDpcList@4
|
|
|
|
/* Return on original stack */
|
|
pop esp
|
|
ret
|
|
|
|
PUBLIC _Ki386EnableCurrentLargePage@8
|
|
_Ki386EnableCurrentLargePage@8:
|
|
/* Save StartAddress in eax */
|
|
mov eax, [esp + 4]
|
|
|
|
/* Save new CR3 value in ecx */
|
|
mov ecx, [esp + 8]
|
|
|
|
/* Save flags value */
|
|
pushfd
|
|
|
|
/* Disable interrupts */
|
|
cli
|
|
|
|
/* Compute linear address */
|
|
sub eax, offset _Ki386EnableCurrentLargePage@8
|
|
add eax, offset _Ki386LargePageIdentityLabel
|
|
|
|
/* Save old CR3 in edx and replace with a new one */
|
|
mov edx, cr3
|
|
mov cr3, ecx
|
|
|
|
/* Jump to the next instruction but in linear mapping */
|
|
jmp eax
|
|
|
|
_Ki386LargePageIdentityLabel:
|
|
/* Disable paging */
|
|
mov eax, cr0
|
|
and eax, NOT CR0_PG
|
|
mov cr0, eax
|
|
|
|
/* Jump to the next instruction to clear the prefetch queue */
|
|
jmp $+2
|
|
|
|
/* Enable Page Size Extension in CR4 */
|
|
mov ecx, cr4
|
|
or ecx, CR4_PSE
|
|
mov cr4, ecx
|
|
|
|
/* Done, now re-enable paging */
|
|
or eax, CR0_PG
|
|
mov cr0, eax
|
|
|
|
/* Jump to virtual address */
|
|
mov eax, offset VirtualSpace
|
|
jmp eax
|
|
|
|
VirtualSpace:
|
|
/* Restore CR3 contents */
|
|
mov cr3, edx
|
|
|
|
/* Restore flags */
|
|
popfd
|
|
|
|
ret 8
|
|
|
|
/* FIXFIX: Move to C code ****/
|
|
PUBLIC _Ki386SetupAndExitToV86Mode@4
|
|
_Ki386SetupAndExitToV86Mode@4:
|
|
|
|
/* Enter V8086 mode */
|
|
pushad
|
|
sub esp, (12 + KTRAP_FRAME_LENGTH + NPX_FRAME_LENGTH + 16)
|
|
mov ecx, esp
|
|
call @KiEnterV86Mode@4
|
|
jmp $
|
|
|
|
|
|
PUBLIC @Ki386BiosCallReturnAddress@4
|
|
@Ki386BiosCallReturnAddress@4:
|
|
|
|
/* Exit V8086 mode */
|
|
call @KiExitV86Mode@4
|
|
mov esp, eax
|
|
add esp, (12 + KTRAP_FRAME_LENGTH + NPX_FRAME_LENGTH + 16)
|
|
popad
|
|
ret 4
|
|
|
|
END
|