arch/metag/tbx/tbiroot.S

   1 /*
   2  * tbiroot.S
   3  *
   4  * Copyright (C) 2001, 2002, 2012 Imagination Technologies.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it under
   7  * the terms of the GNU General Public License version 2 as published by the
   8  * Free Software Foundation.
   9  *
  10  * Module that creates and via ___TBI function returns a TBI Root Block for
  11  * interrupt and background processing on the current thread.
  12  */
  13
  14         .file   "tbiroot.S"
  15 #include <asm/metag_regs.h>
  16
  17 /*
  18  * Get data structures and defines from the TBI C header
  19  */
  20 #include <asm/tbx.h>
  21
  22
  23 /* If signals need to be exchanged we must create a TBI Root Block */
  24
  25         .data
  26         .balign 8
  27         .global ___pTBIs
  28         .type   ___pTBIs,object
  29 ___pTBIs:
  30         .long   0 /* Bgnd+Int root block ptrs */
  31         .long   0
  32         .size   ___pTBIs,.-___pTBIs
  33
  34
  35 /*
  36  * Return ___pTBIs value specific to execution level with promotion/demotion
  37  *
  38  * Register Usage: D1Ar1 is Id, D0Re0 is the primary result
  39  *                 D1Re0 is secondary result (___pTBIs for other exec level)
  40  */
  41         .text
  42         .balign 4
  43         .global ___TBI
  44         .type   ___TBI,function
  45 ___TBI:
  46         TSTT    D1Ar1,#HI(TBID_ISTAT_BIT)       /* Bgnd or Int level? */
  47         MOVT    A1LbP,#HI(___pTBIs)
  48         ADD     A1LbP,A1LbP,#LO(___pTBIs)
  49         GETL    D0Re0,D1Re0,[A1LbP] /* Base of root block table */
  50         SWAPNZ  D0Re0,D1Re0                     /* Swap if asked */
  51         MOV     PC,D1RtP
  52         .size   ___TBI,.-___TBI
  53
  54
  55 /*
  56  * Return identifier of the current thread in TBI segment or signal format with
  57  * secondary mask to indicate privilege and interrupt level of thread
  58  */
  59         .text
  60         .balign 4
  61         .global ___TBIThrdPrivId
  62         .type   ___TBIThrdPrivId,function
  63 ___TBIThrdPrivId:
  64         .global ___TBIThreadId
  65         .type   ___TBIThreadId,function
  66 ___TBIThreadId:
  67 #ifndef METAC_0_1
  68         MOV     D1Re0,TXSTATUS                  /* Are we privileged or int? */
  69         MOV     D0Re0,TXENABLE                  /* Which thread are we? */
  70 /* Disable privilege adaption for now */
  71         ANDT    D1Re0,D1Re0,#HI(TXSTATUS_ISTAT_BIT) /* +TXSTATUS_PSTAT_BIT) */
  72         LSL     D1Re0,D1Re0,#TBID_ISTAT_S-TXSTATUS_ISTAT_S
  73         AND     D0Re0,D0Re0,#TXENABLE_THREAD_BITS
  74         LSL     D0Re0,D0Re0,#TBID_THREAD_S-TXENABLE_THREAD_S
  75 #else
  76 /* Thread 0 only */
  77         XOR     D0Re0,D0Re0,D0Re0
  78         XOR     D1Re0,D1Re0,D1Re0
  79 #endif
  80         MOV     PC,D1RtP                        /* Return */
  81         .size   ___TBIThrdPrivId,.-___TBIThrdPrivId
  82         .size   ___TBIThreadId,.-___TBIThreadId
  83
  84
  85 /*
  86  * End of tbiroot.S
  87  */