1 files changed, 48 insertions, 0 deletions
diff --git a/Source/Kernel/TaskManager/V86/v86.wtf.asm b/Source/Kernel/TaskManager/V86/v86.wtf.asm
new file mode 100644
index 0000000..09b08a2
--- /dev/null
+++ b/Source/Kernel/TaskManager/V86/v86.wtf.asm
@@ -0,0 +1,48 @@
+; This is the procedure that is first run when starting a V86 thread
+; Parameters : esp+4 = page directory to switch to, esp+8 = v86_regs_t pointer
+; Algorithm :
+; - Switch page directory
+; - Create a false IRET structure, with : (first pushed first)
+;   GS, FS, DS, ES, SS, SP, EFLAGS (with eflags.if and eflags.vm), CS, IP
+; - Set general purpose regisers : ax bx cx dx di si
+; - Call iret, switch to V86 mode.
+
+[BITS 32]
+
+[GLOBAL v86_run]
+v86_run:
+	mov eax, [esp + 4]
+	mov cr3, eax
+	mov eax, [esp + 8]
+
+	xor ebx, ebx
+	mov bx, [eax + 20]		; get GS
+	push ebx
+	mov bx, [eax + 18]		; get FS
+	push ebx
+	mov bx, [eax + 14]		; get DS
+	push ebx
+	mov bx, [eax + 16]		; get ES
+	push ebx
+	mov bx, [eax + 22]		; get SS
+	push ebx
+	mov bx, [eax + 26]		; get SP
+	push ebx
+	pushf
+	pop ebx
+	or ebx, 20200h
+	push ebx
+	xor ebx, ebx
+	mov bx, [eax + 12]		; get CS
+	push ebx
+	mov bx, [eax + 24]		; get IP
+	push ebx
+
+	mov bx, [eax + 2]
+	mov cx, [eax + 4]
+	mov dx, [eax + 6]
+	mov di, [eax + 8]
+	mov si, [eax + 10]
+	mov ax, [eax]
+
+	iret