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|
;; -*- fundamental -*- ---------------------------------------------------
;;
;; Copyright 2008 H. Peter Anvin - All Rights Reserved
;; Copyright 2009 Intel Corporation; author: H. Peter Anvin
;;
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
;; Boston MA 02110-1301, USA; either version 2 of the License, or
;; (at your option) any later version; incorporated herein by reference.
;;
;; -----------------------------------------------------------------------
;;
;; pxeidle.inc
;;
;;
;; Query for the NIC type, and detect certain special cases.
;;
section .text16
;;
;; Initializes the idle mechanism based on the device type
;;
;; Assumes CS == DS == ES
;;
pxe_detect_nic_type:
pushad
mov di,pxenv_get_nic_type
mov bx,PXENV_UNDI_GET_NIC_TYPE
call pxenv
jc .done
cmp word [di],0
jne .done
cmp byte [di+2],2 ; PCI_NIC
jne .done ; No list for non-PCI nics
mov cx,pxe_idle_pci_list.len
mov si,pxe_idle_pci_list
.look_for_id:
lodsd
cmp eax,[di+3] ; VID:DID
je .found_device
loop .look_for_id
.done:
popad
ret
.found_device:
mov word [IdleHook],check_for_arp
jmp .done
;;
;; List of devices for which we want to actually issue idle calls.
;;
section .data16
alignz 4
pxe_idle_pci_list:
;
; Older Broadcom NICs; these need idle calls to avoid FIFO stalls.
;
dw 0x14e4, 0x1659 ; BCM5721
dw 0x14e4, 0x165a ; BCM5722
dw 0x14e4, 0x165b ; BCM5723
dw 0x14e4, 0x1668 ; BCM5714
dw 0x14e4, 0x1669 ; BCM5714S
dw 0x14e4, 0x166a ; BCM5780
dw 0x14e4, 0x166b ; BCM5780S
dw 0x14e4, 0x1673 ; BCM5755M
dw 0x14e4, 0x1674 ; BCM5756ME
dw 0x14e4, 0x1678 ; BCM5715
dw 0x14e4, 0x1679 ; BCM5715S
dw 0x14e4, 0x167b ; BCM5755
;
.len equ ($-pxe_idle_pci_list) >> 2
section .bss16
pxenv_get_nic_type:
.status: resw 1
.nic_type: resb 1
.vid: resw 1
.did: resw 1
.base_class: resb 1
.sub_class: resb 1
.prog_intf: resb 1
.rev: resb 1
.busdevfunc: resw 1
.svid: resw 1
.sdid: resw 1
section .text16
;
; Call the receive loop while idle. This is done mostly so we can respond to
; ARP messages, but perhaps in the future this can be used to do network
; console.
;
; hpa sez: people using automatic control on the serial port get very
; unhappy if we poll for ARP too often (the PXE stack is pretty slow,
; typically.) Therefore, only poll if at least 4 BIOS timer ticks have
; passed since the last poll, and reset this when a character is
; received (call reset_idle).
;
; Note: we only do this if pxe_detect_nic_type has set the IdleHook
; to point to this routine.
;
check_for_arp:
pushad
mov di,packet_buf
mov [pxe_udp_read_pkt.buffer],di
mov [pxe_udp_read_pkt.buffer+2],ds
mov word [pxe_udp_read_pkt.buffersize],packet_buf_size
mov eax,[MyIP]
mov [pxe_udp_read_pkt.dip],eax
mov word [pxe_udp_read_pkt.lport],htons(9) ; discard port
mov di,pxe_udp_read_pkt
mov bx,PXENV_UDP_READ
call pxenv
; Ignore result...
popad
ret
|
