.model flat,C\r
.code\r
\r
+;------------------------------------------------------------------------------\r
+; VOID\r
+; EFIAPI\r
+; InternalX86EnablePaging64 (\r
+; IN UINT16 Cs,\r
+; IN UINT64 EntryPoint,\r
+; IN UINT64 Context1, OPTIONAL\r
+; IN UINT64 Context2, OPTIONAL\r
+; IN UINT64 NewStack\r
+; );\r
+;------------------------------------------------------------------------------\r
InternalX86EnablePaging64 PROC\r
cli\r
- mov [esp], @F ; offset for far retf\r
+ mov [esp], @F ; offset for far retf, seg is the 1st arg\r
mov eax, cr4\r
or al, (1 SHL 5)\r
mov cr4, eax ; enable PAE\r
or ah, 1 ; set LME\r
wrmsr\r
mov eax, cr0\r
- bts eax, 31\r
+ bts eax, 31 ; set PG\r
mov cr0, eax ; enable paging\r
- retf\r
+ retf ; topmost 2 dwords hold the address\r
@@: ; long mode starts here\r
- DB 67h, 48h\r
+ DB 67h, 48h ; 32-bit address size, 64-bit operand size\r
mov ebx, [esp] ; mov rbx, [esp]\r
DB 67h, 48h\r
mov ecx, [esp + 8] ; mov rcx, [esp + 8]\r
DB 48h\r
add esp, -20h ; add rsp, -20h\r
call ebx ; call rbx\r
- jmp $\r
+ hlt ; no one should get here\r
InternalX86EnablePaging64 ENDP\r
\r
END\r