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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** Packet Pool Management (Packet) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_packet.h"
/* Bring in externs for caller checking code. */
NX_CALLER_CHECKING_EXTERNS
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nxe_packet_pool_create PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks for errors in the packet pool create */
/* function call. */
/* */
/* INPUT */
/* */
/* pool_ptr Packet Pool control block */
/* name_ptr Packet Pool string pointer */
/* payload_size Size of packet payload */
/* pool_start Starting address of pool */
/* pool_size Number of bytes in pool */
/* pool_control_block_size Size of packet pool control */
/* block */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_packet_pool_create Actual packet pool create */
/* function */
/* tx_thread_identify Get current thread pointer */
/* tx_thread_preemption_change Change preemption for thread */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _nxe_packet_pool_create(NX_PACKET_POOL *pool_ptr, CHAR *name_ptr, ULONG payload_size,
VOID *pool_start, ULONG pool_size, UINT pool_control_block_size)
{
UINT status;
ULONG rounded_payload_size;
ULONG rounded_pool_size;
ULONG header_size;
UINT old_threshold = 0;
NX_PACKET_POOL *created_pool;
ULONG created_count;
CHAR *end_memory;
CHAR *created_end;
CHAR *payload_address;
VOID *rounded_pool_start;
TX_THREAD *current_thread;
/* Check for invalid input pointers. */
if ((pool_ptr == NX_NULL) || (pool_start == NX_NULL) || (pool_control_block_size != (UINT)sizeof(NX_PACKET_POOL)))
{
return(NX_PTR_ERROR);
}
/* Align the starting address to four bytes. */
/*lint -e{923} suppress cast between ULONG and pointer. */
rounded_pool_start = (VOID *)((((ALIGN_TYPE)pool_start + NX_PACKET_ALIGNMENT - 1) / NX_PACKET_ALIGNMENT) * NX_PACKET_ALIGNMENT);
/* Round the pool size down to something that is evenly divisible by alignment. */
/*lint -e{923} suppress cast between ULONG and pointer. */
rounded_pool_size = (ULONG)(((pool_size - ((ALIGN_TYPE)rounded_pool_start - (ALIGN_TYPE)pool_start)) / NX_PACKET_ALIGNMENT) * NX_PACKET_ALIGNMENT);
/* Calculate the address of payload. */
/*lint -e{923} suppress cast between ULONG and pointer. */
payload_address = (CHAR *)((ALIGN_TYPE)rounded_pool_start + sizeof(NX_PACKET));
/* Align the address of payload. */
/*lint -e{923} suppress cast between ULONG and pointer. */
payload_address = (CHAR *)((((ALIGN_TYPE)payload_address + NX_PACKET_ALIGNMENT - 1) / NX_PACKET_ALIGNMENT) * NX_PACKET_ALIGNMENT);
/* Calculate the header size. */
/*lint -e{923} suppress cast between ULONG and pointer. */
header_size = (ULONG)((ALIGN_TYPE)payload_address - (ALIGN_TYPE)rounded_pool_start);
/* Round the packet size up to something that helps guarantee proper alignment for header and payload. */
rounded_payload_size = (ULONG)(((header_size + payload_size + NX_PACKET_ALIGNMENT - 1) / NX_PACKET_ALIGNMENT) * NX_PACKET_ALIGNMENT - header_size);
/* Check for an invalid pool and payload size. */
if ((pool_size <= NX_PACKET_ALIGNMENT) || (!payload_size) ||
((rounded_payload_size + header_size) > rounded_pool_size))
{
return(NX_SIZE_ERROR);
}
/* Calculate the end of the pool memory area. */
end_memory = ((CHAR *)pool_start) + (pool_size - 1);
/* Pickup current thread pointer. */
current_thread = tx_thread_identify();
/* Disable preemption temporarily. */
if (current_thread)
{
tx_thread_preemption_change(current_thread, 0, &old_threshold);
}
/* Loop to check for the pool instance already created. */
created_pool = _nx_packet_pool_created_ptr;
created_count = _nx_packet_pool_created_count;
while (created_count--)
{
/* Calculate the created pool's end of memory. */
created_end = created_pool -> nx_packet_pool_start + (created_pool -> nx_packet_pool_size - 1);
/* Is the new pool already created? */
/*lint -e{946} suppress pointer subtraction, since it is necessary. */
if ((pool_ptr == created_pool) ||
((pool_start >= (VOID *)created_pool -> nx_packet_pool_start) && (pool_start < (VOID *)created_end)) ||
((end_memory >= created_pool -> nx_packet_pool_start) && (end_memory < created_end)))
{
/* Restore preemption. */
if (current_thread)
{
/*lint -e{644} suppress variable might not be initialized, since "old_threshold" was initialized by previous tx_thread_preemption_change. */
tx_thread_preemption_change(current_thread, old_threshold, &old_threshold);
}
/* Duplicate packet pool created, return an error! */
return(NX_PTR_ERROR);
}
/* Move to next entry. */
created_pool = created_pool -> nx_packet_pool_created_next;
}
/* Restore preemption. */
if (current_thread)
{
tx_thread_preemption_change(current_thread, old_threshold, &old_threshold);
}
/* Check for appropriate caller. */
NX_INIT_AND_THREADS_CALLER_CHECKING
/* Call actual packet pool create function. */
status = _nx_packet_pool_create(pool_ptr, name_ptr, payload_size, pool_start, pool_size);
/* Return completion status. */
return(status);
}
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