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![David Howells](/assets/img/avatar_default.png)
When the kernel is running in secure boot mode, we lock down the kernel to prevent userspace from modifying the running kernel image. Whilst this includes prohibiting access to things like /dev/mem, it must also prevent access by means of configuring driver modules in such a way as to cause a device to access or modify the kernel image. To this end, annotate module_param* statements that refer to hardware configuration and indicate for future reference what type of parameter they specify. The parameter parser in the core sees this information and can skip such parameters with an error message if the kernel is locked down. The module initialisation then runs as normal, but just sees whatever the default values for those parameters is. Note that we do still need to do the module initialisation because some drivers have viable defaults set in case parameters aren't specified and some drivers support automatic configuration (e.g. PNP or PCI) in addition to manually coded parameters. This patch annotates drivers in drivers/net/wan/. Suggested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk> Signed-off-by: David Howells <dhowells@redhat.com> cc: "Jan \"Yenya\" Kasprzak" <kas@fi.muni.cz> cc: netdev@vger.kernel.org
351 lines
7.2 KiB
C
351 lines
7.2 KiB
C
/*
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* Comtrol SV11 card driver
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*
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* This is a slightly odd Z85230 synchronous driver. All you need to
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* know basically is
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*
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* Its a genuine Z85230
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*
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* It supports DMA using two DMA channels in SYNC mode. The driver doesn't
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* use these facilities
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*
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* The control port is at io+1, the data at io+3 and turning off the DMA
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* is done by writing 0 to io+4
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*
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* The hardware does the bus handling to avoid the need for delays between
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* touching control registers.
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*
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* Port B isn't wired (why - beats me)
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*
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* Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/delay.h>
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#include <linux/hdlc.h>
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#include <linux/ioport.h>
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#include <linux/slab.h>
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#include <net/arp.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#include <asm/dma.h>
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#include <asm/byteorder.h>
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#include "z85230.h"
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static int dma;
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/*
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* Network driver support routines
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*/
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static inline struct z8530_dev* dev_to_sv(struct net_device *dev)
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{
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return (struct z8530_dev *)dev_to_hdlc(dev)->priv;
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}
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/*
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* Frame receive. Simple for our card as we do HDLC and there
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* is no funny garbage involved
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*/
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static void hostess_input(struct z8530_channel *c, struct sk_buff *skb)
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{
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/* Drop the CRC - it's not a good idea to try and negotiate it ;) */
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skb_trim(skb, skb->len - 2);
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skb->protocol = hdlc_type_trans(skb, c->netdevice);
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skb_reset_mac_header(skb);
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skb->dev = c->netdevice;
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/*
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* Send it to the PPP layer. We don't have time to process
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* it right now.
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*/
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netif_rx(skb);
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}
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/*
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* We've been placed in the UP state
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*/
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static int hostess_open(struct net_device *d)
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{
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struct z8530_dev *sv11 = dev_to_sv(d);
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int err = -1;
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/*
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* Link layer up
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*/
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switch (dma) {
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case 0:
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err = z8530_sync_open(d, &sv11->chanA);
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break;
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case 1:
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err = z8530_sync_dma_open(d, &sv11->chanA);
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break;
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case 2:
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err = z8530_sync_txdma_open(d, &sv11->chanA);
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break;
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}
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if (err)
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return err;
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err = hdlc_open(d);
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if (err) {
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switch (dma) {
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case 0:
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z8530_sync_close(d, &sv11->chanA);
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break;
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case 1:
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z8530_sync_dma_close(d, &sv11->chanA);
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break;
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case 2:
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z8530_sync_txdma_close(d, &sv11->chanA);
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break;
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}
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return err;
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}
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sv11->chanA.rx_function = hostess_input;
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/*
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* Go go go
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*/
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netif_start_queue(d);
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return 0;
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}
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static int hostess_close(struct net_device *d)
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{
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struct z8530_dev *sv11 = dev_to_sv(d);
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/*
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* Discard new frames
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*/
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sv11->chanA.rx_function = z8530_null_rx;
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hdlc_close(d);
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netif_stop_queue(d);
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switch (dma) {
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case 0:
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z8530_sync_close(d, &sv11->chanA);
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break;
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case 1:
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z8530_sync_dma_close(d, &sv11->chanA);
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break;
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case 2:
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z8530_sync_txdma_close(d, &sv11->chanA);
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break;
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}
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return 0;
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}
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static int hostess_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
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{
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/* struct z8530_dev *sv11=dev_to_sv(d);
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z8530_ioctl(d,&sv11->chanA,ifr,cmd) */
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return hdlc_ioctl(d, ifr, cmd);
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}
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/*
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* Passed network frames, fire them downwind.
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*/
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static netdev_tx_t hostess_queue_xmit(struct sk_buff *skb,
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struct net_device *d)
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{
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return z8530_queue_xmit(&dev_to_sv(d)->chanA, skb);
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}
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static int hostess_attach(struct net_device *dev, unsigned short encoding,
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unsigned short parity)
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{
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if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
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return 0;
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return -EINVAL;
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}
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/*
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* Description block for a Comtrol Hostess SV11 card
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*/
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static const struct net_device_ops hostess_ops = {
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.ndo_open = hostess_open,
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.ndo_stop = hostess_close,
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.ndo_start_xmit = hdlc_start_xmit,
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.ndo_do_ioctl = hostess_ioctl,
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};
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static struct z8530_dev *sv11_init(int iobase, int irq)
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{
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struct z8530_dev *sv;
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struct net_device *netdev;
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/*
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* Get the needed I/O space
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*/
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if (!request_region(iobase, 8, "Comtrol SV11")) {
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pr_warn("I/O 0x%X already in use\n", iobase);
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return NULL;
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}
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sv = kzalloc(sizeof(struct z8530_dev), GFP_KERNEL);
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if (!sv)
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goto err_kzalloc;
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/*
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* Stuff in the I/O addressing
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*/
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sv->active = 0;
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sv->chanA.ctrlio = iobase + 1;
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sv->chanA.dataio = iobase + 3;
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sv->chanB.ctrlio = -1;
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sv->chanB.dataio = -1;
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sv->chanA.irqs = &z8530_nop;
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sv->chanB.irqs = &z8530_nop;
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outb(0, iobase + 4); /* DMA off */
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/* We want a fast IRQ for this device. Actually we'd like an even faster
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IRQ ;) - This is one driver RtLinux is made for */
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if (request_irq(irq, z8530_interrupt, 0,
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"Hostess SV11", sv) < 0) {
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pr_warn("IRQ %d already in use\n", irq);
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goto err_irq;
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}
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sv->irq = irq;
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sv->chanA.private = sv;
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sv->chanA.dev = sv;
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sv->chanB.dev = sv;
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if (dma) {
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/*
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* You can have DMA off or 1 and 3 thats the lot
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* on the Comtrol.
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*/
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sv->chanA.txdma = 3;
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sv->chanA.rxdma = 1;
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outb(0x03 | 0x08, iobase + 4); /* DMA on */
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if (request_dma(sv->chanA.txdma, "Hostess SV/11 (TX)"))
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goto err_txdma;
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if (dma == 1)
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if (request_dma(sv->chanA.rxdma, "Hostess SV/11 (RX)"))
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goto err_rxdma;
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}
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/* Kill our private IRQ line the hostess can end up chattering
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until the configuration is set */
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disable_irq(irq);
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/*
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* Begin normal initialise
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*/
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if (z8530_init(sv)) {
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pr_err("Z8530 series device not found\n");
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enable_irq(irq);
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goto free_dma;
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}
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z8530_channel_load(&sv->chanB, z8530_dead_port);
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if (sv->type == Z85C30)
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z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream);
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else
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z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream_85230);
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enable_irq(irq);
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/*
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* Now we can take the IRQ
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*/
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sv->chanA.netdevice = netdev = alloc_hdlcdev(sv);
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if (!netdev)
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goto free_dma;
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dev_to_hdlc(netdev)->attach = hostess_attach;
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dev_to_hdlc(netdev)->xmit = hostess_queue_xmit;
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netdev->netdev_ops = &hostess_ops;
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netdev->base_addr = iobase;
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netdev->irq = irq;
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if (register_hdlc_device(netdev)) {
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pr_err("unable to register HDLC device\n");
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free_netdev(netdev);
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goto free_dma;
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}
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z8530_describe(sv, "I/O", iobase);
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sv->active = 1;
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return sv;
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free_dma:
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if (dma == 1)
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free_dma(sv->chanA.rxdma);
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err_rxdma:
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if (dma)
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free_dma(sv->chanA.txdma);
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err_txdma:
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free_irq(irq, sv);
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err_irq:
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kfree(sv);
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err_kzalloc:
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release_region(iobase, 8);
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return NULL;
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}
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static void sv11_shutdown(struct z8530_dev *dev)
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{
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unregister_hdlc_device(dev->chanA.netdevice);
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z8530_shutdown(dev);
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free_irq(dev->irq, dev);
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if (dma) {
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if (dma == 1)
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free_dma(dev->chanA.rxdma);
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free_dma(dev->chanA.txdma);
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}
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release_region(dev->chanA.ctrlio - 1, 8);
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free_netdev(dev->chanA.netdevice);
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kfree(dev);
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}
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static int io = 0x200;
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static int irq = 9;
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module_param_hw(io, int, ioport, 0);
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MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
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module_param_hw(dma, int, dma, 0);
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MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
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module_param_hw(irq, int, irq, 0);
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MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
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MODULE_AUTHOR("Alan Cox");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");
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static struct z8530_dev *sv11_unit;
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int init_module(void)
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{
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if ((sv11_unit = sv11_init(io, irq)) == NULL)
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return -ENODEV;
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return 0;
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}
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void cleanup_module(void)
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{
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if (sv11_unit)
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sv11_shutdown(sv11_unit);
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}
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