1 files changed, 42 insertions, 0 deletions
diff --git a/kernel/usrspace.s b/kernel/usrspace.s
new file mode 100644
index 0000000..e52f2e0
--- /dev/null
+++ b/kernel/usrspace.s
@@ -0,0 +1,42 @@
+global userspace_init
+extern _binary_usrbin_bin_start
+extern _binary_usrbin_bin_size
+
+userspace_init:
+  push ebp
+  mov ebp, esp
+  push esi
+  push edi
+  mov ecx, _binary_usrbin_bin_size
+  mov esi, _binary_usrbin_bin_start
+  mov edi, 0x100000
+.loop:
+  movsb
+  dec ecx
+  jz .end
+  jmp .loop
+.end:
+  pop edi
+  pop esi
+  call usrcall
+  pop ebp
+  ret
+
+usrcall:
+  push ebp
+  mov ebp, esp
+  cli
+  mov ax, 0x23
+  mov ds, ax
+  mov es, ax
+  mov fs, ax
+  mov gs, ax
+  mov eax, esp
+  push dword 0x23
+  push eax
+  pushf
+  push dword 0x1B
+  push dword 0x00100000
+  iret
+  pop ebp
+  ret