Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

features/FEATURE_LWIP/lwip-interface/emac_stack_lwip.cpp@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

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elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2016 ARM Limited
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Licensed under the Apache License, Version 2.0 (the "License");
elessair 0:f269e3021894 5 * you may not use this file except in compliance with the License.
elessair 0:f269e3021894 6 * You may obtain a copy of the License at
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 9 *
elessair 0:f269e3021894 10 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 11 * distributed under the License is distributed on an "AS IS" BASIS,
elessair 0:f269e3021894 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 13 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 14 * limitations under the License.
elessair 0:f269e3021894 15 */
elessair 0:f269e3021894 16
elessair 0:f269e3021894 17 #if DEVICE_EMAC
elessair 0:f269e3021894 18
elessair 0:f269e3021894 19 #include "emac_stack_mem.h"
elessair 0:f269e3021894 20 #include "pbuf.h"
elessair 0:f269e3021894 21
elessair 0:f269e3021894 22 emac_stack_mem_t *emac_stack_mem_alloc(emac_stack_t* stack, uint32_t size, uint32_t align)
elessair 0:f269e3021894 23 {
elessair 0:f269e3021894 24
elessair 0:f269e3021894 25 struct pbuf *pbuf = pbuf_alloc(PBUF_RAW, size + align, PBUF_RAM);
elessair 0:f269e3021894 26 if (pbuf == NULL) {
elessair 0:f269e3021894 27 return NULL;
elessair 0:f269e3021894 28 }
elessair 0:f269e3021894 29
elessair 0:f269e3021894 30 if (align) {
elessair 0:f269e3021894 31 uint32_t remainder = (uint32_t)pbuf->payload % align;
elessair 0:f269e3021894 32 uint32_t offset = align - remainder;
elessair 0:f269e3021894 33 if (offset >= align) {
elessair 0:f269e3021894 34 offset = align;
elessair 0:f269e3021894 35 }
elessair 0:f269e3021894 36
elessair 0:f269e3021894 37 pbuf->payload = (void*)((char*)pbuf->payload + offset);
elessair 0:f269e3021894 38 pbuf->tot_len -= offset;
elessair 0:f269e3021894 39 pbuf->len -= offset;
elessair 0:f269e3021894 40 }
elessair 0:f269e3021894 41
elessair 0:f269e3021894 42 return (emac_stack_mem_t*)pbuf;
elessair 0:f269e3021894 43 }
elessair 0:f269e3021894 44
elessair 0:f269e3021894 45 void emac_stack_mem_free(emac_stack_t* stack, emac_stack_mem_t *mem)
elessair 0:f269e3021894 46 {
elessair 0:f269e3021894 47 pbuf_free((struct pbuf*)mem);
elessair 0:f269e3021894 48 }
elessair 0:f269e3021894 49
elessair 0:f269e3021894 50 void *emac_stack_mem_ptr(emac_stack_t* stack, emac_stack_mem_t *mem)
elessair 0:f269e3021894 51 {
elessair 0:f269e3021894 52 return ((struct pbuf*)mem)->payload;
elessair 0:f269e3021894 53 }
elessair 0:f269e3021894 54
elessair 0:f269e3021894 55 uint32_t emac_stack_mem_len(emac_stack_t* stack, emac_stack_mem_t *mem)
elessair 0:f269e3021894 56 {
elessair 0:f269e3021894 57 return ((struct pbuf*)mem)->len;
elessair 0:f269e3021894 58 }
elessair 0:f269e3021894 59
elessair 0:f269e3021894 60 void emac_stack_mem_set_len(emac_stack_t* stack, emac_stack_mem_t *mem, uint32_t len)
elessair 0:f269e3021894 61 {
elessair 0:f269e3021894 62 struct pbuf *pbuf = (struct pbuf*)mem;
elessair 0:f269e3021894 63
elessair 0:f269e3021894 64 pbuf->len = len;
elessair 0:f269e3021894 65 }
elessair 0:f269e3021894 66
elessair 0:f269e3021894 67 emac_stack_mem_t *emac_stack_mem_chain_dequeue(emac_stack_t* stack, emac_stack_mem_chain_t **chain)
elessair 0:f269e3021894 68 {
elessair 0:f269e3021894 69 struct pbuf **list = (struct pbuf**)chain;
elessair 0:f269e3021894 70 struct pbuf *head = *list;
elessair 0:f269e3021894 71 *list = (*list)->next;
elessair 0:f269e3021894 72
elessair 0:f269e3021894 73 return (emac_stack_mem_t *)head;
elessair 0:f269e3021894 74 }
elessair 0:f269e3021894 75
elessair 0:f269e3021894 76 uint32_t emac_stack_mem_chain_len(emac_stack_t* stack, emac_stack_mem_chain_t *chain)
elessair 0:f269e3021894 77 {
elessair 0:f269e3021894 78 return ((struct pbuf*)chain)->tot_len;
elessair 0:f269e3021894 79 }
elessair 0:f269e3021894 80
elessair 0:f269e3021894 81 void emac_stack_mem_ref(emac_stack_t* stack, emac_stack_mem_t *mem)
elessair 0:f269e3021894 82 {
elessair 0:f269e3021894 83 pbuf_ref((struct pbuf*)mem);
elessair 0:f269e3021894 84 }
elessair 0:f269e3021894 85
elessair 0:f269e3021894 86 #endif /* DEVICE_EMAC */