projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b920de1b DH |
1 | ############################################################################### |
| 2 | # | |
| 3 | # MN10300 Context switch operation | |
| 4 | # | |
| 5 | # Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
| 6 | # Written by David Howells (dhowells@redhat.com) | |
| 7 | # | |
| 8 | # This program is free software; you can redistribute it and/or | |
| 9 | # modify it under the terms of the GNU General Public Licence | |
| 10 | # as published by the Free Software Foundation; either version | |
| 11 | # 2 of the Licence, or (at your option) any later version. | |
| 12 | # | |
| 13 | ############################################################################### | |
| 14 | #include <linux/sys.h> | |
| 15 | #include <linux/linkage.h> | |
| 16 | #include <asm/thread_info.h> | |
| 17 | #include <asm/cpu-regs.h> | |
| 18 | ||
| 19 | .text | |
| 20 | ||
| 21 | ############################################################################### | |
| 22 | # | |
| 23 | # struct task_struct *__switch_to(struct thread_struct *prev, | |
| 24 | # struct thread_struct *next, | |
| 25 | # struct task_struct *prev_task) | |
| 26 | # | |
| 27 | ############################################################################### | |
| 28 | ENTRY(__switch_to) | |
| 29 | movm [d2,d3,a2,a3,exreg1],(sp) | |
| 30 | or EPSW_NMID,epsw | |
| 31 | ||
| 32 | mov (44,sp),d2 | |
| 33 | ||
| 34 | mov d0,a0 | |
| 35 | mov d1,a1 | |
| 36 | ||
| 37 | # save prev context | |
| 38 | mov (__frame),d0 | |
| 39 | mov d0,(THREAD_FRAME,a0) | |
| 40 | mov __switch_back,d0 | |
| 41 | mov d0,(THREAD_PC,a0) | |
| 42 | mov sp,a2 | |
| 43 | mov a2,(THREAD_SP,a0) | |
| 44 | mov a3,(THREAD_A3,a0) | |
| 45 | ||
| 46 | mov (THREAD_A3,a1),a3 | |
| 47 | mov (THREAD_SP,a1),a2 | |
| 48 | ||
| 49 | # switch | |
| 50 | mov a2,sp | |
| 51 | ||
| 52 | # load next context | |
| 53 | GET_THREAD_INFO a2 | |
| 54 | mov a2,(__current_ti) | |
| 55 | mov (TI_task,a2),a2 | |
| 56 | mov a2,(__current) | |
| 57 | #ifdef CONFIG_MN10300_CURRENT_IN_E2 | |
| 58 | mov a2,e2 | |
| 59 | #endif | |
| 60 | ||
| 61 | mov (THREAD_FRAME,a1),a2 | |
| 62 | mov a2,(__frame) | |
| 63 | mov (THREAD_PC,a1),a2 | |
| 64 | mov d2,d0 # for ret_from_fork | |
| 65 | mov d0,a0 # for __switch_to | |
| 66 | ||
| 67 | jmp (a2) | |
| 68 | ||
| 69 | __switch_back: | |
| 70 | and ~EPSW_NMID,epsw | |
| 71 | ret [d2,d3,a2,a3,exreg1],32 |