add poke-rls tool

[netwatch.git] / tools / poke-rls-asm.S

diff --git a/tools/poke-rls-asm.S b/tools/poke-rls-asm.S
new file mode 100644 (file)
index 0000000..ee44854
--- /dev/null
+++ b/tools/poke-rls-asm.S
@@ -0,0 +1,20 @@
+.global poke
+poke:
+       # Preload registers: $0x1BADD00D
+       mov $0x1BADD00D, %ecx
+
+       # Parameter: I/O port to set bit 2 of
+       mov 4(%esp), %dx
+       inl %dx, %eax
+       or $4, %eax
+       outl %eax, %dx
+
+       # Count down for a while
+       mov $0x10000, %edx
+loop:
+       dec %edx
+       jz loop
+
+       # Maybe SMM poked something?
+       mov %ecx, %eax
+       ret