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/*
* uncached_memory.c
*
* This module will declare 1 MB of memory and switch off the caching for it.
*
* pucGetUncachedMemory( ulSize ) returns a trunc of this memory with a length
* rounded up to a multiple of 4 KB
*
* ucIsCachedMemory( pucBuffer ) returns non-zero if a given pointer is NOT
* within the range of the 1 MB non-cached memory.
*
*/
/*
* After "_end", 1 MB of uncached memory will be allocated for DMA transfers.
* Both the DMA descriptors as well as all EMAC TX-buffers will be allocated in
* uncached memory.
*/
/* Standard includes. */
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
/* FreeRTOS includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
/* FreeRTOS+TCP includes. */
#include "FreeRTOS_IP.h"
#include "FreeRTOS_Sockets.h"
#include "FreeRTOS_IP_Private.h"
#include "Zynq/x_emacpsif.h"
#include "Zynq/x_topology.h"
#include "xstatus.h"
#include "xparameters.h"
#include "xparameters_ps.h"
#include "xil_exception.h"
#include "xil_mmu.h"
#include "uncached_memory.h"
#define UNCACHED_MEMORY_SIZE 0x100000ul
#define DDR_MEMORY_END (XPAR_PS7_DDR_0_S_AXI_HIGHADDR+1)
static void vInitialiseUncachedMemory( void );
static uint8_t *pucHeadOfMemory;
static uint32_t ulMemorySize;
static uint8_t *pucStartOfMemory = NULL;
uint8_t ucIsCachedMemory( const uint8_t *pucBuffer )
{
uint8_t ucReturn;
if( ( pucStartOfMemory != NULL ) &&
( pucBuffer >= pucStartOfMemory ) &&
( pucBuffer < ( pucStartOfMemory + UNCACHED_MEMORY_SIZE ) ) )
{
ucReturn = pdFALSE;
}
else
{
ucReturn = pdTRUE;
}
return ucReturn;
}
uint8_t *pucGetUncachedMemory( uint32_t ulSize )
{
uint8_t *pucReturn;
if( pucStartOfMemory == NULL )
{
vInitialiseUncachedMemory( );
}
if( ( pucStartOfMemory == NULL ) || ( ulSize > ulMemorySize ) )
{
pucReturn = NULL;
}
else
{
uint32_t ulSkipSize;
pucReturn = pucHeadOfMemory;
ulSkipSize = ( ulSize + 0x1000ul ) & ~0xffful;
pucHeadOfMemory += ulSkipSize;
ulMemorySize -= ulSkipSize;
}
return pucReturn;
}
extern u8 _end;
static void vInitialiseUncachedMemory( )
{
/* At the end of program's space... */
pucStartOfMemory = (uint8_t *) &_end;
/*
* Align the start address to 1 MB boundary.
*/
pucStartOfMemory = (uint8_t *)( ( ( uint32_t )pucStartOfMemory + UNCACHED_MEMORY_SIZE ) & ( ~( UNCACHED_MEMORY_SIZE - 1 ) ) );
if( ( ( u32 )pucStartOfMemory ) + UNCACHED_MEMORY_SIZE > DDR_MEMORY_END )
{
// vLoggingPrintf("vInitialiseUncachedMemory: Can not allocate uncached memory\n" );
}
else
{
/*
* Some objects want to be stored in uncached memory. Hence the 1 MB
* address range that starts after "_end" is made uncached
* by setting appropriate attributes in the translation table.
*/
/* FIXME claudio rossi. Modified to prevent data abort exception (misaligned access)
* when application is compiled with -O1 or more optimization flag.
*/
/* Xil_SetTlbAttributes( ( uint32_t )pucStartOfMemory, 0xc02 ); // addr, attr */
Xil_SetTlbAttributes( ( uint32_t )pucStartOfMemory, 0x1c02 ); // addr, attr
/* For experiments in the SDIO driver, make the remaining uncached memory public */
pucHeadOfMemory = pucStartOfMemory;
ulMemorySize = UNCACHED_MEMORY_SIZE;
memset( pucStartOfMemory, '\0', UNCACHED_MEMORY_SIZE );
}
}
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