target/linux/ubicom32/files/arch/ubicom32/include/asm/range-protect-asm.h

   1 /*
   2  * arch/ubicom32/include/asm/range-protect-asm.h
   3  *   Assembly macros for enabling memory protection.
   4  *
   5  * (C) Copyright 2009, Ubicom, Inc.
   6  *
   7  * This file is part of the Ubicom32 Linux Kernel Port.
   8  *
   9  * The Ubicom32 Linux Kernel Port is free software: you can redistribute
  10  * it and/or modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation, either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * The Ubicom32 Linux Kernel Port is distributed in the hope that it
  15  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  16  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  * the GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with the Ubicom32 Linux Kernel Port.  If not,
  21  * see <http://www.gnu.org/licenses/>.
  22  *
  23  * Ubicom32 implementation derived from (with many thanks):
  24  *   arch/m68knommu
  25  *   arch/blackfin
  26  *   arch/parisc
  27  */
  28
  29 #ifndef _ASM_UBICOM32_RANGE_PROTECT_ASM_H
  30 #define _ASM_UBICOM32_RANGE_PROTECT_ASM_H
  31
  32 #if defined(__ASSEMBLY__)
  33
  34 #include <asm/thread-asm.h>
  35
  36 /*
  37  * You should only use the enable/disable ranges when you have the atomic lock,
  38  * if you do not there will be problems.
  39  */
  40
  41 /*
  42  * enable_kernel_ranges
  43  *      Enable the kernel ranges (disabling protection) for thread,
  44  *      where thread == (1 << thread number)
  45  */
  46 .macro  enable_kernel_ranges thread
  47 #ifdef CONFIG_PROTECT_KERNEL
  48         or.4    I_RANGE0_EN, I_RANGE0_EN, \thread        /* Enable Range Register */
  49         or.4    D_RANGE0_EN, D_RANGE0_EN, \thread
  50         or.4    D_RANGE1_EN, D_RANGE1_EN, \thread
  51 #endif
  52 .endm
  53
  54 /*
  55  * enable_kernel_ranges_for_current
  56  *      Enable the kernel ranges (disabling protection) for this thread
  57  */
  58 .macro  enable_kernel_ranges_for_current scratch_reg
  59 #ifdef CONFIG_PROTECT_KERNEL
  60         thread_get_self_mask \scratch_reg
  61         enable_kernel_ranges \scratch_reg
  62 #endif
  63 .endm
  64
  65 /*
  66  * disable_kernel_ranges
  67  *      Disables the kernel ranges (enabling protection) for thread
  68  *      where thread == (1 << thread number)
  69  */
  70 .macro  disable_kernel_ranges thread
  71 #ifdef CONFIG_PROTECT_KERNEL
  72         not.4   \thread, \thread
  73         and.4   I_RANGE0_EN, I_RANGE0_EN, \thread        /* Disable Range Register */
  74         and.4   D_RANGE0_EN, D_RANGE0_EN, \thread
  75         and.4   D_RANGE1_EN, D_RANGE1_EN, \thread
  76 #endif
  77 .endm
  78
  79 /*
  80  * disable_kernel_ranges_for_current
  81  *      Disable kernel ranges (enabling protection) for this thread
  82  */
  83 .macro  disable_kernel_ranges_for_current scratch_reg
  84 #ifdef CONFIG_PROTECT_KERNEL
  85         thread_get_self_mask \scratch_reg
  86         disable_kernel_ranges \scratch_reg
  87 #endif
  88 .endm
  89 #endif
  90
  91 #endif  /* _ASM_UBICOM32_RANGE_PROTECT_ASM_H */