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nuttx/arch/arm/src/samv7/sam_allocateheap.c

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/****************************************************************************
* arch/arm/src/samv7/sam_allocateheap.c
*
* Copyright (C) 2015 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 <sys/types.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/board.h>
#include <nuttx/kmalloc.h>
#include <arch/samv7/chip.h>
#include <arch/board/board.h>
#include "mpu.h"
#include "up_arch.h"
#include "up_internal.h"
#include "sam_mpuinit.h"
#include "sam_periphclks.h"
/****************************************************************************
* Private Definitions
****************************************************************************/
/* All SAM's have SRAM. In addition, they may have external SRAM or SDRAM */
#define HAVE_SDRAM_REGION 0 /* Assume no external SDRAM */
#define HAVE_EXTSRAM0_REGION 0 /* Assume no external SRAM at CS0 */
#define HAVE_EXTSRAM1_REGION 0 /* Assume no external SRAM at CS1 */
#define HAVE_EXTSRAM2_REGION 0 /* Assume no external SRAM at CS2 */
#define HAVE_EXTSRAM3_REGION 0 /* Assume no external SRAM at CS3 */
/* Check if external SDRAM is supported and, if so, it is is intended
* to be used as heap.
*/
#if !defined(CONFIG_SAMV7_SDRAMC) || !defined(CONFIG_SAMV7_SDRAMHEAP)
# undef CONFIG_SAMV7_SDRAMSIZE
# define CONFIG_SAMV7_SDRAMSIZE 0
#endif
/* Check if external SRAM is supported and, if so, it is is intended
* to be used as heap.
*/
#if !defined(CONFIG_SAMV7_EXTSRAM0) || !defined(CONFIG_SAMV7_EXTSRAM0HEAP)
# undef CONFIG_SAMV7_EXTSRAM0SIZE
# define CONFIG_SAMV7_EXTSRAM0SIZE 0
#endif
#if !defined(CONFIG_SAMV7_EXTSRAM1) || !defined(CONFIG_SAMV7_EXTSRAM1HEAP)
# undef CONFIG_SAMV7_EXTSRAM1SIZE
# define CONFIG_SAMV7_EXTSRAM1SIZE 0
#endif
#if !defined(CONFIG_SAMV7_EXTSRAM2) || !defined(CONFIG_SAMV7_EXTSRAM2HEAP)
# undef CONFIG_SAMV7_EXTSRAM2SIZE
# define CONFIG_SAMV7_EXTSRAM2SIZE 0
#endif
#if !defined(CONFIG_SAMV7_EXTSRAM3) || !defined(CONFIG_SAMV7_EXTSRAM3HEAP)
# undef CONFIG_SAMV7_EXTSRAM3SIZE
# define CONFIG_SAMV7_EXTSRAM3SIZE 0
#endif
/* Now lets reconcile the number of configured regions with the available
* memory resource configured for use as a heap region.
*/
#if CONFIG_SAMV7_SDRAMSIZE > 0
# if CONFIG_MM_REGIONS > 1
# undef HAVE_SDRAM_REGION
# define HAVE_SDRAM_REGION 1
# else
# warning "CONFIG_MM_REGIONS < 2: SDRAM not included in HEAP"
# endif
#endif
#if CONFIG_SAMV7_EXTSRAM0SIZE > 0
# if CONFIG_MM_REGIONS > (HAVE_SDRAM_REGION + 1)
# undef HAVE_EXTSRAM0_REGION
# define HAVE_EXTSRAM0_REGION 1
# else
# warning "CONFIG_MM_REGIONS too small: External SRAM0 not included in HEAP"
# endif
#endif
#if CONFIG_SAMV7_EXTSRAM1SIZE > 0
# if CONFIG_MM_REGIONS > (HAVE_SDRAM_REGION + HAVE_EXTSRAM0_REGION + 1)
# undef HAVE_EXTSRAM1_REGION
# define HAVE_EXTSRAM1_REGION 1
# else
# warning "CONFIG_MM_REGIONS too small: External SRAM1 not included in HEAP"
# endif
#endif
#if CONFIG_SAMV7_EXTSRAM2SIZE > 0
# if CONFIG_MM_REGIONS > (HAVE_SDRAM_REGION + HAVE_EXTSRAM0_REGION + HAVE_EXTSRAM1_REGION + 1)
# undef HAVE_EXTSRAM2_REGION
# define HAVE_EXTSRAM2_REGION 1
# else
# warning "CONFIG_MM_REGIONS too small: External SRAM2 not included in HEAP"
# endif
#endif
#if CONFIG_SAMV7_EXTSRAM3SIZE > 0
# if CONFIG_MM_REGIONS > (HAVE_SDRAM_REGION + HAVE_EXTSRAM0_REGION + HAVE_EXTSRAM1_REGION + HAVE_EXTSRAM2_REGION + 1)
# undef HAVE_EXTSRAM3_REGION
# define HAVE_EXTSRAM3_REGION 1
# else
# warning "CONFIG_MM_REGIONS too small: External SRAM3 not included in HEAP"
# endif
#endif
/* Check internal SRAM configuration */
#ifdef CONFIG_ARMV7M_DTCM
# define SRAM_BASE SAM_DTCM_BASE
#else
# define SRAM_BASE SAM_SRAM_BASE
#endif
#if CONFIG_RAM_END > (SRAM_BASE+SAMV7_SRAM_SIZE)
# error "CONFIG_RAM_END is beyond the end of SRAM"
# undef CONFIG_RAM_END
# define CONFIG_RAM_END (SRAM_BASE+SAMV7_SRAM_SIZE)
#elif CONFIG_RAM_END < (SRAM_BASE+SAMV7_SRAM_SIZE)
# warning "CONFIG_RAM_END is before end of SRAM... not all of SRAM used"
#endif
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_allocate_heap
*
* Description:
* This function will be called to dynamically set aside the heap region.
*
* For the kernel build (CONFIG_BUILD_PROTECTED=y) with both kernel- and
* user-space heaps (CONFIG_MM_KERNEL_HEAP=y), this function provides the
* size of the unprotected, user-space heap.
*
* If a protected kernel-space heap is provided, the kernel heap must be
* allocated (and protected) by an analogous up_allocate_kheap().
*
* The following memory map is assumed for the flat build:
*
* .data region. Size determined at link time.
* .bss region Size determined at link time.
* IDLE thread stack. Size determined by CONFIG_IDLETHREAD_STACKSIZE.
* Heap. Extends to the end of SRAM.
*
* The following memory map is assumed for the kernel build:
*
* Kernel .data region. Size determined at link time.
* Kernel .bss region Size determined at link time.
* Kernel IDLE thread stack. Size determined by CONFIG_IDLETHREAD_STACKSIZE.
* Padding for alignment
* User .data region. Size determined at link time.
* User .bss region Size determined at link time.
* Kernel heap. Size determined by CONFIG_MM_KERNEL_HEAPSIZE.
* User heap. Extends to the end of SRAM.
*
****************************************************************************/
void up_allocate_heap(FAR void **heap_start, size_t *heap_size)
{
#if defined(CONFIG_BUILD_PROTECTED) && defined(CONFIG_MM_KERNEL_HEAP)
/* Get the unaligned size and position of the user-space heap.
* This heap begins after the user-space .bss section at an offset
* of CONFIG_MM_KERNEL_HEAPSIZE (subject to alignment).
*/
uintptr_t ubase = (uintptr_t)USERSPACE->us_bssend + CONFIG_MM_KERNEL_HEAPSIZE;
size_t usize = CONFIG_RAM_END - ubase;
int log2;
DEBUGASSERT(ubase < (uintptr_t)CONFIG_RAM_END);
/* Adjust that size to account for MPU alignment requirements.
* NOTE that there is an implicit assumption that the CONFIG_RAM_END
* is aligned to the MPU requirement.
*/
log2 = (int)mpu_log2regionfloor(usize);
DEBUGASSERT((CONFIG_RAM_END & ((1 << log2) - 1)) == 0);
usize = (1 << log2);
ubase = CONFIG_RAM_END - usize;
/* Return the user-space heap settings */
board_led_on(LED_HEAPALLOCATE);
*heap_start = (FAR void*)ubase;
*heap_size = usize;
/* Allow user-mode access to the user heap memory */
sam_mpu_uheap((uintptr_t)ubase, usize);
#else
/* Return the heap settings */
board_led_on(LED_HEAPALLOCATE);
*heap_start = (FAR void*)g_idle_topstack;
*heap_size = CONFIG_RAM_END - g_idle_topstack;
#endif
}
/****************************************************************************
* Name: up_allocate_kheap
*
* Description:
* For the kernel build (CONFIG_BUILD_PROTECTED=y) with both kernel- and
* user-space heaps (CONFIG_MM_KERNEL_HEAP=y), this function allocates
* (and protects) the kernel-space heap.
*
****************************************************************************/
#if defined(CONFIG_BUILD_PROTECTED) && defined(CONFIG_MM_KERNEL_HEAP)
void up_allocate_kheap(FAR void **heap_start, size_t *heap_size)
{
/* Get the unaligned size and position of the user-space heap.
* This heap begins after the user-space .bss section at an offset
* of CONFIG_MM_KERNEL_HEAPSIZE (subject to alignment).
*/
uintptr_t ubase = (uintptr_t)USERSPACE->us_bssend + CONFIG_MM_KERNEL_HEAPSIZE;
size_t usize = CONFIG_RAM_END - ubase;
int log2;
DEBUGASSERT(ubase < (uintptr_t)CONFIG_RAM_END);
/* Adjust that size to account for MPU alignment requirements.
* NOTE that there is an implicit assumption that the CONFIG_RAM_END
* is aligned to the MPU requirement.
*/
log2 = (int)mpu_log2regionfloor(usize);
DEBUGASSERT((CONFIG_RAM_END & ((1 << log2) - 1)) == 0);
usize = (1 << log2);
ubase = CONFIG_RAM_END - usize;
/* Return the kernel heap settings (i.e., the part of the heap region
* that was not dedicated to the user heap).
*/
*heap_start = (FAR void*)USERSPACE->us_bssend;
*heap_size = ubase - (uintptr_t)USERSPACE->us_bssend;
}
#endif
/************************************************************************
* Name: up_addregion
*
* Description:
* Memory may be added in non-contiguous chunks. Additional chunks are
* added by calling this function.
*
************************************************************************/
#if CONFIG_MM_REGIONS > 1
void up_addregion(void)
{
#if HAVE_SDRAM_REGION != 0
/* Allow user access to the heap memory */
sam_mpu_uheap(SAM_SDRAMCS_BASE, CONFIG_SAMV7_SDRAMSIZE);
/* Add the region */
kumm_addregion((FAR void*)SAM_SDRAMCS_BASE, CONFIG_SAMV7_SDRAMSIZE);
#endif /* HAVE_SDRAM_REGION */
#if HAVE_EXTSRAM0_REGION != 0
/* Allow user access to the heap memory */
sam_mpu_uheap(SAM_EXTCS0_BASE, CONFIG_SAMV7_EXTSRAM0SIZE);
/* Add the region */
kumm_addregion((FAR void*)SAM_EXTCS0_BASE, CONFIG_SAMV7_EXTSRAM0SIZE);
#endif /* HAVE_EXTSRAM0_REGION */
#if HAVE_EXTSRAM1_REGION != 0
/* Allow user access to the heap memory */
sam_mpu_uheap(SAM_EXTCS1_BASE, CONFIG_SAMV7_EXTSRAM1SIZE);
/* Add the region */
kumm_addregion((FAR void*)SAM_EXTCS1_BASE, CONFIG_SAMV7_EXTSRAM1SIZE);
#endif /* HAVE_EXTSRAM0_REGION */
#if HAVE_EXTSRAM2_REGION != 0
/* Allow user access to the heap memory */
sam_mpu_uheap(SAM_EXTCS2_BASE, CONFIG_SAMV7_EXTSRAM2SIZE);
/* Add the region */
kumm_addregion((FAR void*)SAM_EXTCS2_BASE, CONFIG_SAMV7_EXTSRAM2SIZE);
#endif /* HAVE_EXTSRAM0_REGION */
#if HAVE_EXTSRAM3_REGION != 0
/* Allow user access to the heap memory */
sam_mpu_uheap(SAM_EXTCS3_BASE, CONFIG_SAMV7_EXTSRAM3SIZE);
/* Add the region */
kumm_addregion((FAR void*)SAM_EXTCS3_BASE, CONFIG_SAMV7_EXTSRAM3SIZE);
#endif /* HAVE_EXTSRAM0_REGION */
}
#endif /* CONFIG_MM_REGIONS > 1 */
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