emac_stack_lwip.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2016 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #if DEVICE_EMAC
00018 
00019 #include "emac_stack_mem.h"
00020 #include "pbuf.h"
00021 
00022 emac_stack_mem_t *emac_stack_mem_alloc(emac_stack_t* stack, uint32_t size, uint32_t align)
00023 {
00024 
00025     struct pbuf *pbuf = pbuf_alloc(PBUF_RAW, size + align, PBUF_RAM);
00026     if (pbuf == NULL) {
00027         return NULL;
00028     }
00029 
00030     if (align) {
00031         uint32_t remainder = (uint32_t)pbuf->payload % align;
00032         uint32_t offset = align - remainder;
00033         if (offset >= align) {
00034             offset = align;
00035         }
00036 
00037         pbuf->payload = (void*)((char*)pbuf->payload + offset);
00038         pbuf->tot_len -= offset;
00039         pbuf->len -= offset;
00040     }
00041 
00042     return (emac_stack_mem_t*)pbuf;
00043 }
00044 
00045 void emac_stack_mem_free(emac_stack_t* stack, emac_stack_mem_t *mem)
00046 {
00047     pbuf_free((struct pbuf*)mem);
00048 }
00049 
00050 void emac_stack_mem_copy(emac_stack_t* stack, emac_stack_mem_t *to, emac_stack_mem_t *from)
00051 {
00052     pbuf_copy((struct pbuf*)to, (struct pbuf*)from);
00053 }
00054 
00055 void *emac_stack_mem_ptr(emac_stack_t* stack, emac_stack_mem_t *mem)
00056 {
00057     return ((struct pbuf*)mem)->payload;
00058 }
00059 
00060 uint32_t emac_stack_mem_len(emac_stack_t* stack, emac_stack_mem_t *mem)
00061 {
00062     return ((struct pbuf*)mem)->len;
00063 }
00064 
00065 void emac_stack_mem_set_len(emac_stack_t* stack, emac_stack_mem_t *mem, uint32_t len)
00066 {
00067     struct pbuf *pbuf = (struct pbuf*)mem;
00068 
00069     pbuf->len = len;
00070 }
00071 
00072 emac_stack_mem_t *emac_stack_mem_chain_dequeue(emac_stack_t* stack, emac_stack_mem_chain_t **chain)
00073 {
00074     struct pbuf **list = (struct pbuf**)chain;
00075     struct pbuf *head = *list;
00076     *list = (*list)->next;
00077 
00078     return (emac_stack_mem_t *)head;
00079 }
00080 
00081 uint32_t emac_stack_mem_chain_len(emac_stack_t* stack, emac_stack_mem_chain_t *chain)
00082 {
00083     return ((struct pbuf*)chain)->tot_len;
00084 }
00085 
00086 void emac_stack_mem_ref(emac_stack_t* stack, emac_stack_mem_t *mem)
00087 {
00088     pbuf_ref((struct pbuf*)mem);
00089 }
00090 
00091 #endif /* DEVICE_EMAC */