DisablePaging32.c

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#include "BaseLibInternals.h"
 
__declspec(naked)
VOID
EFIAPI
InternalX86DisablePaging32 (
  IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
  IN      VOID                      *Context1     OPTIONAL,
  IN      VOID                      *Context2     OPTIONAL,
  IN      VOID                      *NewStack
  )
{
  _asm {
    push    ebp
    mov     ebp, esp
    mov     ebx, EntryPoint
    mov     ecx, Context1
    mov     edx, Context2
    pushfd
    pop     edi                         // save EFLAGS to edi
    cli
    mov     eax, cr0
    btr     eax, 31
    mov     esp, NewStack
    mov     cr0, eax
    push    edi
    popfd                               // restore EFLAGS from edi
    push    edx
    push    ecx
    call    ebx
    jmp     $                           // EntryPoint() should not return
  }
}