kolibrios/kernel/branches/net/network/queue.inc

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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2009. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;; queue.inc ;;
;; ;;
;; Written by hidnplayr@kolibrios.org ;;
;; ;;
;; GNU GENERAL PUBLIC LICENSE ;;
;; Version 2, June 1991 ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision$
; The Queues implemented by these macros for a sort of ring-buffer.
; The data to these queue's always looks like this:
;
; At top, you have the queue struct, wich has the size (number of currently queued packets, read and write pointers.
; This struct is followed by a number of slots wich you can read and write to using the macros.
; How these slots look like is up to you to chose, normally they should have at least a pointer to where the real data is.
; (you can see some examples below)
struct queue
.size dd ? ; number of queued packets in thsi queue
.w_ptr dd ? ; current writing pointer in queue
.r_ptr dd ? ; current reading pointer
.data:
ends
struct eth_queue_entry
.owner dd ?
.data_ptr dd ?
.data_size dd ?
.size:
ends
struct tcp_in_queue_entry
.data_ptr dd ?
.data_size dd ?
.offset dd ?
.size:
ends
struct tcp_out_queue_entry
.data_ptr dd ?
.data_size dd ?
.ttl dd ?
.retries dd ?
.owner dd ?
.sendproc dd ?
.seq_num dd ?
.size:
ends
struct socket_queue_entry
.data_ptr dd ?
.data_size dd ?
.offset dd ?
.size:
ends
; The following macros share these inputs:
; ptr = pointer to where the queue data is located
; size = number of slots/entrys in the queue
; entry_size = size of one slot, in bytes
; failaddr = the address where macro will jump to when there is no data in the queue
; additionally, add_to_queue requires you to set esi to the data wich you want to queue
; get_from_queue on the other hand will return a pointer in esi, to the entry you're interessed in
; PS: macros WILL destroy ecx and edi
macro add_to_queue ptr, size, entry_size, failaddr {
cmp [ptr + queue.size], size ; Check if queue isnt full
jge failaddr
inc [ptr + queue.size] ; if not full, queue one more
mov edi, [ptr + queue.w_ptr] ; Current write pointer (FIFO!)
mov ecx, entry_size/4 ; Write the queue entry
rep movsd ;
lea ecx, [size*entry_size+ptr+queue.data]
cmp edi, ecx ; entry size
jl .no_wrap
sub edi, size*entry_size
.no_wrap:
mov [ptr + queue.w_ptr], edi
}
macro get_from_queue ptr, size, entry_size, failaddr {
cmp [ptr + queue.size], 0 ; any packets queued?
je failaddr
dec [ptr + queue.size] ; if so, dequeue one
mov esi, [ptr + queue.r_ptr]
push esi
add esi, entry_size
lea ecx, [size*entry_size+ptr+queue.data]
cmp esi, ecx ; entry size
jl .no_wrap
sub esi, size*entry_size
.no_wrap:
mov dword [ptr + queue.r_ptr], esi
pop esi
}
macro init_queue ptr {
mov [ptr + queue.size] , 0
lea edi, [ptr + queue.data]
mov [ptr + queue.w_ptr], edi
mov [ptr + queue.r_ptr], edi
}