diff options
Diffstat (limited to 'nuttx/arch/arm/src/armv7-m/up_mpu.c')
| -rw-r--r-- | nuttx/arch/arm/src/armv7-m/up_mpu.c | 176 |
1 files changed, 0 insertions, 176 deletions
diff --git a/nuttx/arch/arm/src/armv7-m/up_mpu.c b/nuttx/arch/arm/src/armv7-m/up_mpu.c deleted file mode 100644 index 4bb3f21d9..000000000 --- a/nuttx/arch/arm/src/armv7-m/up_mpu.c +++ /dev/null @@ -1,176 +0,0 @@ -/**************************************************************************** - * arch/arm/src/armv7-m/up_mpu.c - * - * Copyright (C) 2011 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * 3. Neither the name NuttX nor the names of its contributors may be - * used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, - * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS - * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED - * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN - * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - ****************************************************************************/ - -/**************************************************************************** - * Included Files - ****************************************************************************/ - -#include <nuttx/config.h> - -#include <stdint.h> - -#include "mpu.h" -#include "up_internal.h" - -/**************************************************************************** - * Pre-processor Definitions - ****************************************************************************/ - -/**************************************************************************** - * Private Data - ****************************************************************************/ - -/* This set represents the set of disabled memory sub-regions. A bit set - * corresponds to a disabled sub-region; the LS bit corresponds to the first - * region. The array is indexed by the number of subregions: 0 means no sub- - * regions (0xff), and 0 means all subregions but one (0x00). - */ - -static const void uint8_t g_regionmap[9] = -{ - 0xff, 0x7f, 0x3f, 0x1f, 0x0f, 0x07, 0x03, 0x01, 0x00 -}; - -/* The next available region number */ - -static uint8_t g_region; - -/**************************************************************************** - * Private Functions - ****************************************************************************/ - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: mpu_allocregion - * - * Description: - * Allocate the next region - * - * Assumptions: - * - Regions are never deallocated - * - Regions are only allocated early in initialization, so nothing - * special is require; - * - ****************************************************************************/ - -unsigned int mpu_allocregion(void) -{ - return (unsigned int)g_region++; -} - -/**************************************************************************** - * Name: mpu_log2regionsize - * - * Description: - * Determine the smallest value of l2size (log base 2 size) such that the - * following is true: - * - * size <= (1 << l2size) - * - ****************************************************************************/ - -uint8_t mpu_log2regionsize(size_t size) -{ - /* The minimum permitted region size is 16 bytes (log2(16) = 4. */ - - uint32_t l2size; - for (l2size = 4; l2size < 32 && size > (1 << l2size); size++); - return l2size; -} - -/**************************************************************************** - * Name: mpu_subregion - * - * Description: - * Given the size of the (1) memory to be mapped and (2) the log2 size - * of the mapping to use, determine the minimal sub-region set to span - * that memory region. - * - * Assumption: - * l2size has the same properties as the return value from - * mpu_log2regionsize() - * - ****************************************************************************/ - -uint32_t mpu_subregion(size_t size, uint8_t l2size) -{ - unsigned int nsrs - uint32_t asize; - uint32_t mask; - - /* Eight subregions are support. The representation is as an 8-bit - * value with the LS bit corresponding to subregion 0. A bit is set - * to disable the sub-region. - * - * l2size: Log2 of the actual region size is <= (1 << l2size); - */ - - DEBUGASSERT(lsize > 3 && size <= (1 << l2size)); - - /* Examples with l2size = 12: - * - * Shifted Adjusted Number Sub-Region - * Size Mask Size Shift Sub-Regions Bitset - * 0x1000 0x01ff 0x1000 9 8 0x00 - * 0x0c00 0x01ff 0x0c00 9 6 0x03 - * 0x0c40 0x01ff 0x0e00 9 7 0x01 - */ - - if (l2size < 32) - { - mask = ((1 << lsize)-1) >> 3; /* Shifted mask */ - } - - /* The 4Gb region size is a special case */ - - else - { - /* NOTE: There is no way to represent a 4Gb region size in the 32-bit - * input. - */ - - mask = 0x1fffffff; /* Shifted mask */ - } - - asize = (size + mask) & ~mask; /* Adjusted size */ - nsrs = asize >> (lsize-3); /* Number of subregions */ - return g_regionmap[nsrs]; -} - - - |