arch/mips/include/asm/mach-ip27/kernel-entry-init.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2000 Silicon Graphics, Inc.
   7  * Copyright (C) 2005 Ralf Baechle <ralf@linux-mips.org>
   8  */
   9 #ifndef __ASM_MACH_IP27_KERNEL_ENTRY_H
  10 #define __ASM_MACH_IP27_KERNEL_ENTRY_H
  11
  12 #include <asm/sn/addrs.h>
  13 #include <asm/sn/sn0/hubni.h>
  14 #include <asm/sn/klkernvars.h>
  15
  16 /*
  17  * Returns the local nasid into res.
  18  */
  19         .macro GET_NASID_ASM res
  20         dli     \res, LOCAL_HUB_ADDR(NI_STATUS_REV_ID)
  21         ld      \res, (\res)
  22         and     \res, NSRI_NODEID_MASK
  23         dsrl    \res, NSRI_NODEID_SHFT
  24         .endm
  25
  26 /*
  27  * Intentionally empty macro, used in head.S. Override in
  28  * arch/mips/mach-xxx/kernel-entry-init.h when necessary.
  29  */
  30         .macro  kernel_entry_setup
  31         GET_NASID_ASM   t1
  32         move            t2, t1                  # text and data are here
  33         MAPPED_KERNEL_SETUP_TLB
  34         .endm
  35
  36 /*
  37  * Do SMP slave processor setup necessary before we can savely execute C code.
  38  */
  39         .macro  smp_slave_setup
  40         GET_NASID_ASM   t1
  41         dli     t0, KLDIR_OFFSET + (KLI_KERN_VARS * KLDIR_ENT_SIZE) + \
  42                     KLDIR_OFF_POINTER + CAC_BASE
  43         dsll    t1, NASID_SHFT
  44         or      t0, t0, t1
  45         ld      t0, 0(t0)                       # t0 points to kern_vars struct
  46         lh      t1, KV_RO_NASID_OFFSET(t0)
  47         lh      t2, KV_RW_NASID_OFFSET(t0)
  48         MAPPED_KERNEL_SETUP_TLB
  49
  50         /*
  51          * We might not get launched at the address the kernel is linked to,
  52          * so we jump there.
  53          */
  54         PTR_LA  t0, 0f
  55         jr      t0
  56 0:
  57         .endm
  58
  59 #endif /* __ASM_MACH_IP27_KERNEL_ENTRY_H */