############################################################################### # # 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