arch/metag/kernel/head.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2         ! Copyright 2005,2006,2007,2009 Imagination Technologies
   3
   4 #include <linux/init.h>
   5 #include <asm/metag_mem.h>
   6 #include <generated/asm-offsets.h>
   7 #undef __exit
   8
   9         __HEAD
  10         ! Setup the stack and get going into _metag_start_kernel
  11         .global __start
  12         .type   __start,function
  13 __start:
  14         ! D1Ar1 contains pTBI (ISTAT)
  15         ! D0Ar2 contains pTBI
  16         ! D1Ar3 contains __pTBISegs
  17         ! D0Ar4 contains kernel arglist pointer
  18
  19         MOVT    D0Re0,#HI(___pTBIs)
  20         ADD     D0Re0,D0Re0,#LO(___pTBIs)
  21         SETL    [D0Re0],D0Ar2,D1Ar1
  22         MOVT    D0Re0,#HI(___pTBISegs)
  23         ADD     D0Re0,D0Re0,#LO(___pTBISegs)
  24         SETD    [D0Re0],D1Ar3
  25         MOV     A0FrP,#0
  26         MOV     D0Re0,#0
  27         MOV     D1Re0,#0
  28         MOV     D1Ar3,#0
  29         MOV     D1Ar1,D0Ar4                     !Store kernel boot params
  30         MOV     D1Ar5,#0
  31         MOV     D0Ar6,#0
  32 #ifdef CONFIG_METAG_DSP
  33         MOV     D0.8,#0
  34 #endif
  35         MOVT    A0StP,#HI(_init_thread_union)
  36         ADD     A0StP,A0StP,#LO(_init_thread_union)
  37         ADD     A0StP,A0StP,#THREAD_INFO_SIZE
  38         MOVT    D1RtP,#HI(_metag_start_kernel)
  39         CALL    D1RtP,#LO(_metag_start_kernel)
  40         .size   __start,.-__start
  41
  42         !! Needed by TBX
  43         .global __exit
  44         .type   __exit,function
  45 __exit:
  46         XOR     TXENABLE,D0Re0,D0Re0
  47         .size   __exit,.-__exit
  48
  49 #ifdef CONFIG_SMP
  50         .global _secondary_startup
  51         .type _secondary_startup,function
  52 _secondary_startup:
  53 #if CONFIG_PAGE_OFFSET < LINGLOBAL_BASE
  54         ! In case GCOn has just been turned on we need to fence any writes that
  55         ! the boot thread might have performed prior to coherency taking effect.
  56         MOVT    D0Re0,#HI(LINSYSEVENT_WR_ATOMIC_UNLOCK)
  57         MOV     D1Re0,#0
  58         SETD    [D0Re0], D1Re0
  59 #endif
  60         MOVT    A0StP,#HI(_secondary_data_stack)
  61         ADD     A0StP,A0StP,#LO(_secondary_data_stack)
  62         GETD    A0StP,[A0StP]
  63         ADD     A0StP,A0StP,#THREAD_INFO_SIZE
  64         B       _secondary_start_kernel
  65         .size   _secondary_startup,.-_secondary_startup
  66 #endif