# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1461579905 -7200
# Node ID 670b8fdc252b18de2cf4a59dc90efadb04df7046
# Parent  152e64b6487407d04a4c492c4dcb53adf90640f1
Avoid the task entry routine if ASID is zero.

diff -r 152e64b64874 -r 670b8fdc252b stage2/entry.S
--- a/stage2/entry.S	Sun Apr 24 23:44:35 2016 +0200
+++ b/stage2/entry.S	Mon Apr 25 12:25:05 2016 +0200
@@ -21,7 +21,6 @@
 .extern interrupt_handler
 .extern current_registers
 .extern current_stack_pointer
-.extern enter_task
 .globl _tlb_entry
 .globl _exc_entry
 .globl _irq_entry
@@ -96,7 +95,17 @@
 	tlbwr
 	nop
 
+	/* For ASID == 0... */
+
+	andi $k1, $k0, 0xff			/* ASID */
+	bnez $k1, _tlb_exit
+	nop
+	eret
+	nop
+
 _tlb_exit:
+	/* For ASID != 0... */
+
 	lui $k0, %hi(_enter_task)
 	ori $k0, $k0, %lo(_enter_task)
 	lw $k1, 0($k0)