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/*
* arch/ubicom32/include/asm/range-protect-asm.h
* Assembly macros for enabling memory protection.
*
* (C) Copyright 2009, Ubicom, Inc.
*
* This file is part of the Ubicom32 Linux Kernel Port.
*
* The Ubicom32 Linux Kernel Port is free software: you can redistribute
* it and/or modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, either version 2 of the
* License, or (at your option) any later version.
*
* The Ubicom32 Linux Kernel Port is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the Ubicom32 Linux Kernel Port. If not,
* see <http://www.gnu.org/licenses/>.
*
* Ubicom32 implementation derived from (with many thanks):
* arch/m68knommu
* arch/blackfin
* arch/parisc
*/
#ifndef _ASM_UBICOM32_RANGE_PROTECT_ASM_H
#define _ASM_UBICOM32_RANGE_PROTECT_ASM_H
#if defined(__ASSEMBLY__)
#include <asm/thread-asm.h>
/*
* You should only use the enable/disable ranges when you have the atomic lock,
* if you do not there will be problems.
*/
/*
* enable_kernel_ranges
* Enable the kernel ranges (disabling protection) for thread,
* where thread == (1 << thread number)
*/
.macro enable_kernel_ranges thread
#ifdef CONFIG_PROTECT_KERNEL
or.4 I_RANGE0_EN, I_RANGE0_EN, \thread /* Enable Range Register */
or.4 D_RANGE0_EN, D_RANGE0_EN, \thread
or.4 D_RANGE1_EN, D_RANGE1_EN, \thread
#endif
.endm
/*
* enable_kernel_ranges_for_current
* Enable the kernel ranges (disabling protection) for this thread
*/
.macro enable_kernel_ranges_for_current scratch_reg
#ifdef CONFIG_PROTECT_KERNEL
thread_get_self_mask \scratch_reg
enable_kernel_ranges \scratch_reg
#endif
.endm
/*
* disable_kernel_ranges
* Disables the kernel ranges (enabling protection) for thread
* where thread == (1 << thread number)
*/
.macro disable_kernel_ranges thread
#ifdef CONFIG_PROTECT_KERNEL
not.4 \thread, \thread
and.4 I_RANGE0_EN, I_RANGE0_EN, \thread /* Disable Range Register */
and.4 D_RANGE0_EN, D_RANGE0_EN, \thread
and.4 D_RANGE1_EN, D_RANGE1_EN, \thread
#endif
.endm
/*
* disable_kernel_ranges_for_current
* Disable kernel ranges (enabling protection) for this thread
*/
.macro disable_kernel_ranges_for_current scratch_reg
#ifdef CONFIG_PROTECT_KERNEL
thread_get_self_mask \scratch_reg
disable_kernel_ranges \scratch_reg
#endif
.endm
#endif
#endif /* _ASM_UBICOM32_RANGE_PROTECT_ASM_H */
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