| 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 */ |
| 92 | |
