LXR linux/arch/c6x/kernel/switch

   1/*
   2 *  Copyright (C) 2011 Texas Instruments Incorporated
   3 *  Author: Mark Salter (msalter@redhat.com)
   4 *
   5 *  This program is free software; you can redistribute it and/or modify
   6 *  it under the terms of the GNU General Public License version 2 as
   7 *  published by the Free Software Foundation.
   8 */
   9
  10#include <linux/linkage.h>
  11#include <asm/asm-offsets.h>
  12
  13#define SP      B15
  14
  15        /*
  16         * void __switch_to(struct thread_info *prev,
  17         *                  struct thread_info *next,
  18         *                  struct task_struct *tsk) ;
  19         */
  20ENTRY(__switch_to)
  21        LDDW    .D2T2   *+B4(THREAD_B15_14),B7:B6
  22 ||     MV      .L2X    A4,B5   ; prev
  23 ||     MV      .L1X    B4,A5   ; next
  24 ||     MVC     .S2     RILC,B1
  25
  26        STW     .D2T2   B3,*+B5(THREAD_PC)
  27 ||     STDW    .D1T1   A13:A12,*+A4(THREAD_A13_12)
  28 ||     MVC     .S2     ILC,B0
  29
  30        LDW     .D2T2   *+B4(THREAD_PC),B3
  31 ||     LDDW    .D1T1   *+A5(THREAD_A13_12),A13:A12
  32
  33        STDW    .D1T1   A11:A10,*+A4(THREAD_A11_10)
  34 ||     STDW    .D2T2   B1:B0,*+B5(THREAD_RICL_ICL)
  35#ifndef __DSBT__
  36 ||     MVKL    .S2     current_ksp,B1
  37#endif
  38
  39        STDW    .D2T2   B15:B14,*+B5(THREAD_B15_14)
  40 ||     STDW    .D1T1   A15:A14,*+A4(THREAD_A15_14)
  41#ifndef __DSBT__
  42 ||     MVKH    .S2     current_ksp,B1
  43#endif
  44
  45        ;; Switch to next SP
  46        MV      .S2     B7,SP
  47#ifdef __DSBT__
  48 ||     STW     .D2T2   B7,*+B14(current_ksp)
  49#else
  50 ||     STW     .D2T2   B7,*B1
  51 ||     MV      .L2     B6,B14
  52#endif
  53 ||     LDDW    .D1T1   *+A5(THREAD_RICL_ICL),A1:A0
  54
  55        STDW    .D2T2   B11:B10,*+B5(THREAD_B11_10)
  56 ||     LDDW    .D1T1   *+A5(THREAD_A15_14),A15:A14
  57
  58        STDW    .D2T2   B13:B12,*+B5(THREAD_B13_12)
  59 ||     LDDW    .D1T1   *+A5(THREAD_A11_10),A11:A10
  60
  61        B       .S2     B3              ; return in next E1
  62 ||     LDDW    .D2T2   *+B4(THREAD_B13_12),B13:B12
  63
  64        LDDW    .D2T2   *+B4(THREAD_B11_10),B11:B10
  65        NOP
  66
  67        MV      .L2X    A0,B0
  68 ||     MV      .S1     A6,A4
  69
  70        MVC     .S2     B0,ILC
  71 ||     MV      .L2X    A1,B1
  72
  73        MVC     .S2     B1,RILC
  74ENDPROC(__switch_to)
  75