%include "symbol.asm"
+EXPORT GetGDTR
+EXPORT GetIDTR
+
+
+
+EXTERN handle_svm_exit
+
+EXPORT launch_svm
+
+
[BITS 32]
+%macro vmrun 0
+ db 00fh, 001h, 0d8h
+%endmacro
+
+
+;VMRUN equ db 0Fh, 01h, D8h
+;VMLOAD equ db 0x0F,0x01,0xDA
+;VMSAVE equ db 0x0F,0x01,0xDB
+;STGI equ db 0x0F,0x01,0xDC
+;CLGI equ db 0x0F,0x01,0xDD
+
+
+
+
+GetGDTR:
+ push ebp
+ mov ebp, esp
+ pusha
+ mov ebx, [ebp + 8]
+ sgdt [ebx]
+
+ popa
+ pop ebp
+ ret
+GetIDTR:
+ push ebp
+ mov ebp, esp
+ pusha
+ mov ebx, [ebp + 8]
+ sgdt [ebx]
+
+ popa
+ pop ebp
+ ret
+; I think its safe to say that there are some pretty serious register issues...
+launch_svm:
+ push ebp
+ mov ebp, esp
+ pusha
+
+ mov eax, [ebp + 8]
+ vmrun
+; db 00fh, 001h, 0d8h
+ popa
+ pop ebp
+ ret
+
+
+
+; eventual svm_launch
+; pusha
+; pushf
+;
+; .vmm_loop
+; vmrun
+; push guest GPRs
+; call handle_svm_exit
+; jz .vmm_loop
+; popf
+; popa
+; ret
+;
+;
+;
+
+
+
+;; Need to check this..
+;; Since RAX/EAX is saved in the VMCB, we should probably just
+;; do our own replacement for pusha/popa that excludes [e|r]ax
+safe_svm_launch:
+ push ebp
+ mov ebp, esp
+ pushf
+ pusha
+
+.vmm_loop:
+ mov eax, [ebp + 8]
+ vmrun
+ pusha
+ call handle_svm_exit
+ and eax, eax
+ popa ;; restore the guest GPRs, (DOES THIS AFFECT E/RFLAGS?)
+ jz .vmm_loop
+
+ ;; HOW DO WE GET THE RETURN VALUE OF HANDLE_SVM_EXIT BACK TO THE CALLER
+ popf
+ popa
+ pop ebp
+ ret
+
+
%endif
+
+
