arch/xtensa/kernel/mxhead.S

   1 /*
   2  * Xtensa Secondary Processors startup code.
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 2001 - 2013 Tensilica Inc.
   9  *
  10  * Joe Taylor <joe@tensilica.com>
  11  * Chris Zankel <chris@zankel.net>
  12  * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
  13  * Pete Delaney <piet@tensilica.com>
  14  */
  15
  16 #include <linux/linkage.h>
  17
  18 #include <asm/cacheasm.h>
  19 #include <asm/initialize_mmu.h>
  20 #include <asm/mxregs.h>
  21 #include <asm/regs.h>
  22
  23
  24         .section .SecondaryResetVector.text, "ax"
  25
  26
  27 ENTRY(_SecondaryResetVector)
  28         _j _SetupOCD
  29
  30         .begin  no-absolute-literals
  31         .literal_position
  32
  33 _SetupOCD:
  34         /*
  35          * Initialize WB, WS, and clear PS.EXCM (to allow loop instructions).
  36          * Set Interrupt Level just below XCHAL_DEBUGLEVEL to allow
  37          * xt-gdb to single step via DEBUG exceptions received directly
  38          * by ocd.
  39          */
  40         movi    a1, 1
  41         movi    a0, 0
  42         wsr     a1, windowstart
  43         wsr     a0, windowbase
  44         rsync
  45
  46         movi    a1, LOCKLEVEL
  47         wsr     a1, ps
  48         rsync
  49
  50 _SetupMMU:
  51         Offset = _SetupMMU - _SecondaryResetVector
  52
  53 #ifdef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
  54         initialize_mmu
  55 #endif
  56
  57         /*
  58          * Start Secondary Processors with NULL pointer to boot params.
  59          */
  60         movi    a2, 0                           #  a2 == NULL
  61         movi    a3, _startup
  62         jx      a3
  63
  64         .end    no-absolute-literals
  65
  66
  67         .section        .SecondaryResetVector.remapped_text, "ax"
  68         .global         _RemappedSecondaryResetVector
  69
  70         .org 0                                  # Need to do org before literals
  71
  72 _RemappedSecondaryResetVector:
  73         .begin  no-absolute-literals
  74         .literal_position
  75
  76         _j      _RemappedSetupMMU
  77         . = _RemappedSecondaryResetVector + Offset
  78
  79 _RemappedSetupMMU:
  80
  81 #ifdef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
  82         initialize_mmu
  83 #endif
  84
  85         .end    no-absolute-literals