###############################################################################
#
# MN10300 Context switch operation
#
# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
# Written by David Howells (dhowells@redhat.com)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public Licence
# as published by the Free Software Foundation; either version
# 2 of the Licence, or (at your option) any later version.
#
###############################################################################
#include <linux/sys.h>
#include <linux/linkage.h>
#include <asm/thread_info.h>
#include <asm/cpu-regs.h>
.text
###############################################################################
#
# struct task_struct *__switch_to(struct thread_struct *prev,
# struct thread_struct *next,
# struct task_struct *prev_task)
#
###############################################################################
ENTRY(__switch_to)
movm [d2,d3,a2,a3,exreg1],(sp)
or EPSW_NMID,epsw
mov (44,sp),d2
mov d0,a0
mov d1,a1
# save prev context
mov (__frame),d0
mov d0,(THREAD_FRAME,a0)
mov __switch_back,d0
mov d0,(THREAD_PC,a0)
mov sp,a2
mov a2,(THREAD_SP,a0)
mov a3,(THREAD_A3,a0)
mov (THREAD_A3,a1),a3
mov (THREAD_SP,a1),a2
# switch
mov a2,sp
# load next context
GET_THREAD_INFO a2
mov a2,(__current_ti)
mov (TI_task,a2),a2
mov a2,(__current)
#ifdef CONFIG_MN10300_CURRENT_IN_E2
mov a2,e2
#endif
mov (THREAD_FRAME,a1),a2
mov a2,(__frame)
mov (THREAD_PC,a1),a2
mov d2,d0 # for ret_from_fork
mov d0,a0 # for __switch_to
jmp (a2)
__switch_back:
and ~EPSW_NMID,epsw
ret [d2,d3,a2,a3,exreg1],32
