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2aca4b2795
See https://developercommunity.visualstudio.com/content/problem/1180800/ml-x86-assume-directive-causes-invalid-code-genera.html
82 lines
1.7 KiB
ArmAsm
82 lines
1.7 KiB
ArmAsm
/*
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* COPYRIGHT: See COPYING.ARM in the top level directory
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* PROJECT: ReactOS UEFI Boot Library
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* FILE: boot/environ/lib/arch/transfer.asm
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* PURPOSE: Boot Library i386 Transfer Functions
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* PROGRAMMER: Alex Ionescu (alex.ionescu@reactos.org)
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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 _GdtRegister:FWORD
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EXTERN _IdtRegister:FWORD
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EXTERN _BootAppGdtRegister:FWORD
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EXTERN _BootAppIdtRegister:FWORD
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EXTERN _BootApp32Stack:DWORD
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EXTERN _BootApp32EntryRoutine:DWORD
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EXTERN _BootApp32Parameters:DWORD
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/* FUNCTIONS ****************************************************************/
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.code
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PUBLIC _Archx86TransferTo32BitApplicationAsm
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_Archx86TransferTo32BitApplicationAsm:
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/* Save non-volatile registers */
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push ebp
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push esi
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push edi
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push ebx
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/* Save data segments */
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push es
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push ds
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/* Save the old stack */
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mov ebx, esp
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/* Save current GDT/IDT, then load new one */
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sgdt _GdtRegister+2
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sidt _IdtRegister+2
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lgdt _BootAppGdtRegister+2
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lidt _BootAppIdtRegister+2
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/* Load the new stack */
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xor ebp, ebp
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mov esp, _BootApp32Stack
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/* Push old stack onto new stack */
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push ebx
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/* Call the entry routine, passing the parameters */
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mov eax, _BootApp32Parameters
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push eax
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mov eax, _BootApp32EntryRoutine
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call eax
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/* Retore old stack */
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pop ebx
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mov esp, ebx
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/* Restore old GDT/IDT */
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lgdt _GdtRegister+2
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lidt _IdtRegister+2
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/* Retore old segments */
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pop ds
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pop es
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/* Retore non-volatiles */
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pop ebx
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pop edi
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pop esi
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pop ebp
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/* All done */
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ret
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END
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