FreeRTOS/Demo/CORTEX_A9_Cyclone_V_SoC_DK/Altera_Code/SoCSupport/mmu_support.c

/******************************************************************************
*
* Copyright 2013 Altera Corporation. All Rights Reserved.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "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 AUTHOR 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.
*
******************************************************************************/

#include "alt_mmu.h"
#include "mmu_support.h"
//#include "boot_support.h"
#define ARRAY_COUNT(array) (sizeof(array) / sizeof(array[0]))


static uint32_t __attribute__ ((aligned (0x4000))) mmu_pt_storage[4096];

static void * mmu_pt_alloc(const size_t size, void * context) {

	return context;
}

ALT_STATUS_CODE mmu_init(void) {

	//
	// Populate the page table with sections (1 MiB regions).
	//
	ALT_MMU_MEM_REGION_t regions[] =
	{
	        // Cacheable Memory area: 1 GiB
			{
				.va			= (void *)0x00000000,
				.pa			= (void *)0x00000000,
				.size		= 0x40000000,
				.access		= ALT_MMU_AP_FULL_ACCESS,
				.attributes	= ALT_MMU_ATTR_WBA,
				.shareable	= ALT_MMU_TTB_S_NON_SHAREABLE,
				.execute	= ALT_MMU_TTB_XN_DISABLE,
				.security	= ALT_MMU_TTB_NS_SECURE
			},

			// Non-cacheable Memory area: 1 GiB
			{
				.va			= (void *)0x40000000,
				.pa			= (void *)0x00000000,
				.size		= 0x40000000,
				.access		= ALT_MMU_AP_FULL_ACCESS,
				.attributes	= ALT_MMU_ATTR_NC,
				.shareable	= ALT_MMU_TTB_S_SHAREABLE,
				.execute	= ALT_MMU_TTB_XN_DISABLE,
				.security	= ALT_MMU_TTB_NS_SECURE
			},

			// Device area: Everything else
			{
				.va         = (void *)0x80000000,
				.pa         = (void *)0x40000000,
				.size       = 0x40000000,
				.access     = ALT_MMU_AP_NO_ACCESS,
				.attributes = ALT_MMU_ATTR_FAULT,
				.shareable  = ALT_MMU_TTB_S_SHAREABLE,
				.execute    = ALT_MMU_TTB_XN_ENABLE,
				.security   = ALT_MMU_TTB_NS_SECURE
			},

			// Device area: Everything else
			{
				.va         = (void *)0xC0000000,
				.pa         = (void *)0xC0000000,
				.size       = 0x40000000,
				.access     = ALT_MMU_AP_FULL_ACCESS,
				.attributes = ALT_MMU_ATTR_DEVICE,
				.shareable  = ALT_MMU_TTB_S_SHAREABLE,
				.execute    = ALT_MMU_TTB_XN_ENABLE,
				.security   = ALT_MMU_TTB_NS_SECURE
			}
	};

	ALT_STATUS_CODE status = ALT_E_SUCCESS;
	uint32_t * ttb1 = NULL;

	status |= alt_mmu_init();
//	BOOT_CHECK_STATUS;

	size_t reqsize = alt_mmu_va_space_storage_required(regions,
			ARRAY_COUNT(regions));
	if (reqsize > sizeof(mmu_pt_storage))
		status = ALT_E_ERROR;
//	BOOT_CHECK_STATUS;

	status |= alt_mmu_va_space_create(&ttb1, regions, ARRAY_COUNT(regions), mmu_pt_alloc, mmu_pt_storage);
//	BOOT_CHECK_STATUS;

	status |= alt_mmu_va_space_enable(ttb1);
//	BOOT_CHECK_STATUS;

	return status;
}

ALT_STATUS_CODE mmu_uninit(void) {

	return alt_mmu_disable();
}
/* md5sum:4fc6b96893e8e619490fad33b17c96d7 2013-09-28 20:48:16 */