?? os_mem.lst
字號:
C51 COMPILER V8.05a OS_MEM 04/11/2007 16:19:49 PAGE 1
C51 COMPILER V8.05a, COMPILATION OF MODULE OS_MEM
OBJECT MODULE PLACED IN ..\Output\os_mem.obj
COMPILER INVOKED BY: D:\Program Files\keil\C51\BIN\C51.EXE ..\SOURCE\os_mem.c LARGE BROWSE INCDIR(..\app;..\Main;..\Port
-;..\SOURCE) DEBUG OBJECTEXTEND PRINT(..\Output\os_mem.lst) OBJECT(..\Output\os_mem.obj)
line level source
1 /*
2 *********************************************************************************************************
3 * uC/OS-II
4 * The Real-Time Kernel
5 * MEMORY MANAGEMENT
6 *
7 * (c) Copyright 1992-2002, Jean J. Labrosse, Weston, FL
8 * All Rights Reserved
9 *
10 * File : OS_MEM.C
11 * By : Jean J. Labrosse
12 *********************************************************************************************************
13 */
14
15 #ifndef OS_MASTER_FILE
16 #include "includes.h"
17 #endif
18
19 #if (OS_MEM_EN > 0) && (OS_MAX_MEM_PART > 0)
/*
*********************************************************************************************************
* CREATE A MEMORY PARTITION
*
* Description : Create a fixed-sized memory partition that will be managed by uC/OS-II.
*
* Arguments : addr is the starting address of the memory partition
*
* nblks is the number of memory blocks to create from the partition.
*
* blksize is the size (in bytes) of each block in the memory partition.
*
* err is a pointer to a variable containing an error message which will be set by
* this function to either:
*
* OS_NO_ERR if the memory partition has been created correctly.
* OS_MEM_INVALID_ADDR you are specifying an invalid address for the memory
* storage of the partition.
* OS_MEM_INVALID_PART no free partitions available
* OS_MEM_INVALID_BLKS user specified an invalid number of blocks (must be >= 2)
* OS_MEM_INVALID_SIZE user specified an invalid block size
* (must be greater than the size of a pointer)
* Returns : != (OS_MEM *)0 is the partition was created
* == (OS_MEM *)0 if the partition was not created because of invalid arguments or, no
* free partition is available.
*********************************************************************************************************
*/
OS_MEM *OSMemCreate (void *addr, INT32U nblks, INT32U blksize, INT8U *err)
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
OS_MEM *pmem;
INT8U *pblk;
C51 COMPILER V8.05a OS_MEM 04/11/2007 16:19:49 PAGE 2
void **plink;
INT32U i;
#if OS_ARG_CHK_EN > 0
if (addr == (void *)0) { /* Must pass a valid address for the memory part. */
*err = OS_MEM_INVALID_ADDR;
return ((OS_MEM *)0);
}
if (nblks < 2) { /* Must have at least 2 blocks per partition */
*err = OS_MEM_INVALID_BLKS;
return ((OS_MEM *)0);
}
if (blksize < sizeof(void *)) { /* Must contain space for at least a pointer */
*err = OS_MEM_INVALID_SIZE;
return ((OS_MEM *)0);
}
#endif
OS_ENTER_CRITICAL();
pmem = OSMemFreeList; /* Get next free memory partition */
if (OSMemFreeList != (OS_MEM *)0) { /* See if pool of free partitions was empty */
OSMemFreeList = (OS_MEM *)OSMemFreeList->OSMemFreeList;
}
OS_EXIT_CRITICAL();
if (pmem == (OS_MEM *)0) { /* See if we have a memory partition */
*err = OS_MEM_INVALID_PART;
return ((OS_MEM *)0);
}
plink = (void **)addr; /* Create linked list of free memory blocks */
pblk = (INT8U *)addr + blksize;
for (i = 0; i < (nblks - 1); i++) {
*plink = (void *)pblk;
plink = *plink;
pblk = pblk + blksize;
}
*plink = (void *)0; /* Last memory block points to NULL */
pmem->OSMemAddr = addr; /* Store start address of memory partition */
pmem->OSMemFreeList = addr; /* Initialize pointer to pool of free blocks */
pmem->OSMemNFree = nblks; /* Store number of free blocks in MCB */
pmem->OSMemNBlks = nblks;
pmem->OSMemBlkSize = blksize; /* Store block size of each memory blocks */
*err = OS_NO_ERR;
return (pmem);
}
/*$PAGE*/
/*
*********************************************************************************************************
* GET A MEMORY BLOCK
*
* Description : Get a memory block from a partition
*
* Arguments : pmem is a pointer to the memory partition control block
*
* err is a pointer to a variable containing an error message which will be set by this
* function to either:
*
* OS_NO_ERR if the memory partition has been created correctly.
* OS_MEM_NO_FREE_BLKS if there are no more free memory blocks to allocate to caller
* OS_MEM_INVALID_PMEM if you passed a NULL pointer for 'pmem'
*
* Returns : A pointer to a memory block if no error is detected
* A pointer to NULL if an error is detected
C51 COMPILER V8.05a OS_MEM 04/11/2007 16:19:49 PAGE 3
*********************************************************************************************************
*/
void *OSMemGet (OS_MEM *pmem, INT8U *err)
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
void *pblk;
#if OS_ARG_CHK_EN > 0
if (pmem == (OS_MEM *)0) { /* Must point to a valid memory partition */
*err = OS_MEM_INVALID_PMEM;
return ((OS_MEM *)0);
}
#endif
OS_ENTER_CRITICAL();
if (pmem->OSMemNFree > 0) { /* See if there are any free memory blocks */
pblk = pmem->OSMemFreeList; /* Yes, point to next free memory block */
pmem->OSMemFreeList = *(void **)pblk; /* Adjust pointer to new free list */
pmem->OSMemNFree--; /* One less memory block in this partition */
OS_EXIT_CRITICAL();
*err = OS_NO_ERR; /* No error */
return (pblk); /* Return memory block to caller */
}
OS_EXIT_CRITICAL();
*err = OS_MEM_NO_FREE_BLKS; /* No, Notify caller of empty memory partition */
return ((void *)0); /* Return NULL pointer to caller */
}
/*$PAGE*/
/*
*********************************************************************************************************
* GET THE NAME OF A MEMORY PARTITION
*
* Description: This function is used to obtain the name assigned to a memory partition.
*
* Arguments : pmem is a pointer to the memory partition
*
* pname is a pointer to an ASCII string that will receive the name of the memory partitio
-n.
*
* err is a pointer to an error code that can contain one of the following values:
*
* OS_NO_ERR if the name was copied to 'pname'
* OS_MEM_INVALID_PMEM if you passed a NULL pointer for 'pmem'
* OS_ERR_PNAME_NULL You passed a NULL pointer for 'pname'
*
* Returns : The length of the string or 0 if 'pmem' is a NULL pointer.
*********************************************************************************************************
*/
#if OS_MEM_NAME_SIZE > 0
INT8U OSMemNameGet (OS_MEM *pmem, char *pname, INT8U *err)
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
INT8U len;
OS_ENTER_CRITICAL();
C51 COMPILER V8.05a OS_MEM 04/11/2007 16:19:49 PAGE 4
#if OS_ARG_CHK_EN > 0
if (pmem == (OS_MEM *)0) { /* Is 'pmem' a NULL pointer? */
OS_EXIT_CRITICAL(); /* Yes */
*err = OS_MEM_INVALID_PMEM;
return (0);
}
if (pname == (char *)0) { /* Is 'pname' a NULL pointer? */
OS_EXIT_CRITICAL(); /* Yes */
*err = OS_ERR_PNAME_NULL;
return (0);
}
#endif
(void)strcpy(pname, pmem->OSMemName); /* Yes, copy name from OS_MEM */
len = strlen(pname);
OS_EXIT_CRITICAL();
*err = OS_NO_ERR;
return (len);
}
#endif
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