+/*\r
+ * FreeRTOS V202002.00\r
+ * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.\r
+ *\r
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of\r
+ * this software and associated documentation files (the "Software"), to deal in\r
+ * the Software without restriction, including without limitation the rights to\r
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of\r
+ * the Software, and to permit persons to whom the Software is furnished to do so,\r
+ * subject to the following conditions:\r
+ *\r
+ * The above copyright notice and this permission notice shall be included in all\r
+ * copies or substantial portions of the Software.\r
+ *\r
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS\r
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR\r
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER\r
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN\r
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\r
+ *\r
+ * http://aws.amazon.com/freertos\r
+ * http://www.FreeRTOS.org\r
+ */\r
+\r
/*\r
* uncached_memory.c\r
*\r
* This module will declare 1 MB of memory and switch off the caching for it.\r
*\r
* pucGetUncachedMemory( ulSize ) returns a trunc of this memory with a length\r
- * rounded up to a multiple of 4 KB\r
+ * rounded up to a multiple of 4 KB.\r
*\r
* ucIsCachedMemory( pucBuffer ) returns non-zero if a given pointer is NOT\r
* within the range of the 1 MB non-cached memory.\r
\r
#include "uncached_memory.h"\r
\r
-#define UNCACHED_MEMORY_SIZE 0x100000ul\r
+/* Reserve 1 MB of memory. */\r
+#define uncMEMORY_SIZE 0x100000uL\r
+\r
+/* Make sure that each pointer has an alignment of 4 KB. */\r
+#define uncALIGNMENT_SIZE 0x1000uL\r
\r
#define DDR_MEMORY_END (XPAR_PS7_DDR_0_S_AXI_HIGHADDR+1)\r
\r
+#define uncMEMORY_ATTRIBUTE 0x1C02\r
+\r
static void vInitialiseUncachedMemory( void );\r
\r
static uint8_t *pucHeadOfMemory;\r
static uint32_t ulMemorySize;\r
static uint8_t *pucStartOfMemory = NULL;\r
\r
+/* The linker file defines some pseudo variables. '_end' is one of them.\r
+It is located at the first free byte in RAM. */\r
+extern u8 _end;\r
+\r
+/*-----------------------------------------------------------*/\r
+\r
uint8_t ucIsCachedMemory( const uint8_t *pucBuffer )\r
{\r
uint8_t ucReturn;\r
\r
if( ( pucStartOfMemory != NULL ) &&\r
( pucBuffer >= pucStartOfMemory ) &&\r
- ( pucBuffer < ( pucStartOfMemory + UNCACHED_MEMORY_SIZE ) ) )\r
+ ( pucBuffer < ( pucStartOfMemory + uncMEMORY_SIZE ) ) )\r
{\r
ucReturn = pdFALSE;\r
}\r
\r
return ucReturn;\r
}\r
+/*-----------------------------------------------------------*/\r
\r
uint8_t *pucGetUncachedMemory( uint32_t ulSize )\r
{\r
uint8_t *pucReturn;\r
+uint32_t ulSkipSize;\r
\r
if( pucStartOfMemory == NULL )\r
{\r
}\r
else\r
{\r
- uint32_t ulSkipSize;\r
-\r
pucReturn = pucHeadOfMemory;\r
- ulSkipSize = ( ulSize + 0x1000ul ) & ~0xffful;\r
+ /* Make sure that the next pointer return will have a good alignment. */\r
+ ulSkipSize = ( ulSize + uncALIGNMENT_SIZE ) & ~( uncALIGNMENT_SIZE - 1uL );\r
pucHeadOfMemory += ulSkipSize;\r
ulMemorySize -= ulSkipSize;\r
}\r
\r
return pucReturn;\r
}\r
-\r
-extern u8 _end;\r
+/*-----------------------------------------------------------*/\r
\r
static void vInitialiseUncachedMemory( )\r
{\r
/* At the end of program's space... */\r
- pucStartOfMemory = (uint8_t *) &_end;\r
- /*\r
- * Align the start address to 1 MB boundary.\r
- */\r
- pucStartOfMemory = (uint8_t *)( ( ( uint32_t )pucStartOfMemory + UNCACHED_MEMORY_SIZE ) & ( ~( UNCACHED_MEMORY_SIZE - 1 ) ) );\r
+ pucStartOfMemory = ( uint8_t * ) &( _end );\r
\r
- if( ( ( u32 )pucStartOfMemory ) + UNCACHED_MEMORY_SIZE > DDR_MEMORY_END )\r
+ /* Align the start address to 1 MB boundary. */\r
+ pucStartOfMemory = ( uint8_t * )( ( ( uint32_t )pucStartOfMemory + uncMEMORY_SIZE ) & ( ~( uncMEMORY_SIZE - 1 ) ) );\r
+\r
+ if( ( ( u32 )pucStartOfMemory ) + uncMEMORY_SIZE > DDR_MEMORY_END )\r
{\r
-// vLoggingPrintf("vInitialiseUncachedMemory: Can not allocate uncached memory\n" );\r
+ FreeRTOS_printf( ( "vInitialiseUncachedMemory: Can not allocate uncached memory\n" ) );\r
}\r
else\r
{\r
- /*\r
- * Some objects want to be stored in uncached memory. Hence the 1 MB\r
- * address range that starts after "_end" is made uncached\r
- * by setting appropriate attributes in the translation table.\r
- */\r
- /* FIXME claudio rossi. Modified to prevent data abort exception (misaligned access)\r
- * when application is compiled with -O1 or more optimization flag.\r
- */\r
-/* Xil_SetTlbAttributes( ( uint32_t )pucStartOfMemory, 0xc02 ); // addr, attr */\r
- Xil_SetTlbAttributes( ( uint32_t )pucStartOfMemory, 0x1c02 ); // addr, attr\r
-\r
- /* For experiments in the SDIO driver, make the remaining uncached memory public */\r
+ /* Some objects want to be stored in uncached memory. Hence the 1 MB\r
+ address range that starts after "_end" is made uncached by setting\r
+ appropriate attributes in the translation table. */\r
+ Xil_SetTlbAttributes( ( uint32_t ) pucStartOfMemory, uncMEMORY_ATTRIBUTE );\r
+\r
+ /* For experiments in the SDIO driver, make the remaining uncached memory\r
+ public */\r
pucHeadOfMemory = pucStartOfMemory;\r
- ulMemorySize = UNCACHED_MEMORY_SIZE;\r
- memset( pucStartOfMemory, '\0', UNCACHED_MEMORY_SIZE );\r
+ ulMemorySize = uncMEMORY_SIZE;\r
+ memset( pucStartOfMemory, '\0', uncMEMORY_SIZE );\r
}\r
}\r
projects / freertos / blobdiff