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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/net/atari_bionet.c
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Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/net/atari_bionet.c')
-rw-r--r--drivers/net/atari_bionet.c674
1 files changed, 674 insertions, 0 deletions
diff --git a/drivers/net/atari_bionet.c b/drivers/net/atari_bionet.c
new file mode 100644
index 000000000000..1798ce7262c9
--- /dev/null
+++ b/drivers/net/atari_bionet.c
@@ -0,0 +1,674 @@
+/* bionet.c BioNet-100 device driver for linux68k.
+ *
+ * Version: @(#)bionet.c 1.0 02/06/96
+ *
+ * Author: Hartmut Laue <laue@ifk-mp.uni-kiel.de>
+ * and Torsten Narjes <narjes@ifk-mp.uni-kiel.de>
+ *
+ * Little adaptions for integration into pl7 by Roman Hodek
+ *
+ * Some changes in bionet_poll_rx by Karl-Heinz Lohner
+ *
+ What is it ?
+ ------------
+ This driver controls the BIONET-100 LAN-Adapter which connects
+ an ATARI ST/TT via the ACSI-port to an Ethernet-based network.
+
+ This version can be compiled as a loadable module (See the
+ compile command at the bottom of this file).
+ At load time, you can optionally set the debugging level and the
+ fastest response time on the command line of 'insmod'.
+
+ 'bionet_debug'
+ controls the amount of diagnostic messages:
+ 0 : no messages
+ >0 : see code for meaning of printed messages
+
+ 'bionet_min_poll_time' (always >=1)
+ gives the time (in jiffies) between polls. Low values
+ increase the system load (beware!)
+
+ When loaded, a net device with the name 'bio0' becomes available,
+ which can be controlled with the usual 'ifconfig' command.
+
+ It is possible to compile this driver into the kernel like other
+ (net) drivers. For this purpose, some source files (e.g. config-files
+ makefiles, Space.c) must be changed accordingly. (You may refer to
+ other drivers how to do it.) In this case, the device will be detected
+ at boot time and (probably) appear as 'eth0'.
+
+ This code is based on several sources:
+ - The driver code for a parallel port ethernet adapter by
+ Donald Becker (see file 'atp.c' from the PC linux distribution)
+ - The ACSI code by Roman Hodek for the ATARI-ACSI harddisk support
+ and DMA handling.
+ - Very limited information about moving packets in and out of the
+ BIONET-adapter from the TCP package for TOS by BioData GmbH.
+
+ Theory of Operation
+ -------------------
+ Because the ATARI DMA port is usually shared between several
+ devices (eg. harddisk, floppy) we cannot block the ACSI bus
+ while waiting for interrupts. Therefore we use a polling mechanism
+ to fetch packets from the adapter. For the same reason, we send
+ packets without checking that the previous packet has been sent to
+ the LAN. We rely on the higher levels of the networking code to detect
+ missing packets and resend them.
+
+ Before we access the ATARI DMA controller, we check if another
+ process is using the DMA. If not, we lock the DMA, perform one or
+ more packet transfers and unlock the DMA before returning.
+ We do not use 'stdma_lock' unconditionally because it is unclear
+ if the networking code can be set to sleep, which will happen if
+ another (possibly slow) device is using the DMA controller.
+
+ The polling is done via timer interrupts which periodically
+ 'simulate' an interrupt from the Ethernet adapter. The time (in jiffies)
+ between polls varies depending on an estimate of the net activity.
+ The allowed range is given by the variable 'bionet_min_poll_time'
+ for the lower (fastest) limit and the constant 'MAX_POLL_TIME'
+ for the higher (slowest) limit.
+
+ Whenever a packet arrives, we switch to fastest response by setting
+ the polling time to its lowest limit. If the following poll fails,
+ because no packets have arrived, we increase the time for the next
+ poll. When the net activity is low, the polling time effectively
+ stays at its maximum value, resulting in the lowest load for the
+ machine.
+ */
+
+#define MAX_POLL_TIME 10
+
+static char version[] =
+ "bionet.c:v1.0 06-feb-96 (c) Hartmut Laue.\n";
+
+#include <linux/module.h>
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/jiffies.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+
+#include <asm/setup.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/atarihw.h>
+#include <asm/atariints.h>
+#include <asm/atari_acsi.h>
+#include <asm/atari_stdma.h>
+
+
+/* use 0 for production, 1 for verification, >2 for debug
+ */
+#ifndef NET_DEBUG
+#define NET_DEBUG 0
+#endif
+/*
+ * Global variable 'bionet_debug'. Can be set at load time by 'insmod'
+ */
+unsigned int bionet_debug = NET_DEBUG;
+MODULE_PARM(bionet_debug, "i");
+MODULE_PARM_DESC(bionet_debug, "bionet debug level (0-2)");
+MODULE_LICENSE("GPL");
+
+static unsigned int bionet_min_poll_time = 2;
+
+
+/* Information that need to be kept for each board.
+ */
+struct net_local {
+ struct net_device_stats stats;
+ long open_time; /* for debugging */
+ int poll_time; /* polling time varies with net load */
+};
+
+static struct nic_pkt_s { /* packet format */
+ unsigned char status;
+ unsigned char dummy;
+ unsigned char l_lo, l_hi;
+ unsigned char buffer[3000];
+} *nic_packet;
+unsigned char *phys_nic_packet;
+
+/* Index to functions, as function prototypes.
+ */
+static int bionet_open(struct net_device *dev);
+static int bionet_send_packet(struct sk_buff *skb, struct net_device *dev);
+static void bionet_poll_rx(struct net_device *);
+static int bionet_close(struct net_device *dev);
+static struct net_device_stats *net_get_stats(struct net_device *dev);
+static void bionet_tick(unsigned long);
+
+static struct timer_list bionet_timer = TIMER_INITIALIZER(bionet_tick, 0, 0);
+
+#define STRAM_ADDR(a) (((a) & 0xff000000) == 0)
+
+/* The following routines access the ethernet board connected to the
+ * ACSI port via the st_dma chip.
+ */
+#define NODE_ADR 0x60
+
+#define C_READ 8
+#define C_WRITE 0x0a
+#define C_GETEA 0x0f
+#define C_SETCR 0x0e
+
+static int
+sendcmd(unsigned int a0, unsigned int mod, unsigned int cmd) {
+ unsigned int c;
+
+ dma_wd.dma_mode_status = (mod | ((a0) ? 2 : 0) | 0x88);
+ dma_wd.fdc_acces_seccount = cmd;
+ dma_wd.dma_mode_status = (mod | 0x8a);
+
+ if( !acsi_wait_for_IRQ(HZ/2) ) /* wait for cmd ack */
+ return -1; /* timeout */
+
+ c = dma_wd.fdc_acces_seccount;
+ return (c & 0xff);
+}
+
+
+static void
+set_status(int cr) {
+ sendcmd(0,0x100,NODE_ADR | C_SETCR); /* CMD: SET CR */
+ sendcmd(1,0x100,cr);
+
+ dma_wd.dma_mode_status = 0x80;
+}
+
+static int
+get_status(unsigned char *adr) {
+ int i,c;
+
+ DISABLE_IRQ();
+ c = sendcmd(0,0x00,NODE_ADR | C_GETEA); /* CMD: GET ETH ADR*/
+ if( c < 0 ) goto gsend;
+
+ /* now read status bytes */
+
+ for (i=0; i<6; i++) {
+ dma_wd.fdc_acces_seccount = 0; /* request next byte */
+
+ if( !acsi_wait_for_IRQ(HZ/2) ) { /* wait for cmd ack */
+ c = -1;
+ goto gsend; /* timeout */
+ }
+ c = dma_wd.fdc_acces_seccount;
+ *adr++ = (unsigned char)c;
+ }
+ c = 1;
+gsend:
+ dma_wd.dma_mode_status = 0x80;
+ return c;
+}
+
+static irqreturn_t
+bionet_intr(int irq, void *data, struct pt_regs *fp) {
+ return IRQ_HANDLED;
+}
+
+
+static int
+get_frame(unsigned long paddr, int odd) {
+ int c;
+ unsigned long flags;
+
+ DISABLE_IRQ();
+ local_irq_save(flags);
+
+ dma_wd.dma_mode_status = 0x9a;
+ dma_wd.dma_mode_status = 0x19a;
+ dma_wd.dma_mode_status = 0x9a;
+ dma_wd.fdc_acces_seccount = 0x04; /* sector count (was 5) */
+ dma_wd.dma_lo = (unsigned char)paddr;
+ paddr >>= 8;
+ dma_wd.dma_md = (unsigned char)paddr;
+ paddr >>= 8;
+ dma_wd.dma_hi = (unsigned char)paddr;
+ local_irq_restore(flags);
+
+ c = sendcmd(0,0x00,NODE_ADR | C_READ); /* CMD: READ */
+ if( c < 128 ) goto rend;
+
+ /* now read block */
+
+ c = sendcmd(1,0x00,odd); /* odd flag for address shift */
+ dma_wd.dma_mode_status = 0x0a;
+
+ if( !acsi_wait_for_IRQ(100) ) { /* wait for DMA to complete */
+ c = -1;
+ goto rend;
+ }
+ dma_wd.dma_mode_status = 0x8a;
+ dma_wd.dma_mode_status = 0x18a;
+ dma_wd.dma_mode_status = 0x8a;
+ c = dma_wd.fdc_acces_seccount;
+
+ dma_wd.dma_mode_status = 0x88;
+ c = dma_wd.fdc_acces_seccount;
+ c = 1;
+
+rend:
+ dma_wd.dma_mode_status = 0x80;
+ udelay(40);
+ acsi_wait_for_noIRQ(20);
+ return c;
+}
+
+
+static int
+hardware_send_packet(unsigned long paddr, int cnt) {
+ unsigned int c;
+ unsigned long flags;
+
+ DISABLE_IRQ();
+ local_irq_save(flags);
+
+ dma_wd.dma_mode_status = 0x19a;
+ dma_wd.dma_mode_status = 0x9a;
+ dma_wd.dma_mode_status = 0x19a;
+ dma_wd.dma_lo = (unsigned char)paddr;
+ paddr >>= 8;
+ dma_wd.dma_md = (unsigned char)paddr;
+ paddr >>= 8;
+ dma_wd.dma_hi = (unsigned char)paddr;
+
+ dma_wd.fdc_acces_seccount = 0x4; /* sector count */
+ local_irq_restore(flags);
+
+ c = sendcmd(0,0x100,NODE_ADR | C_WRITE); /* CMD: WRITE */
+ c = sendcmd(1,0x100,cnt&0xff);
+ c = sendcmd(1,0x100,cnt>>8);
+
+ /* now write block */
+
+ dma_wd.dma_mode_status = 0x10a; /* DMA enable */
+ if( !acsi_wait_for_IRQ(100) ) /* wait for DMA to complete */
+ goto end;
+
+ dma_wd.dma_mode_status = 0x19a; /* DMA disable ! */
+ c = dma_wd.fdc_acces_seccount;
+
+end:
+ c = sendcmd(1,0x100,0);
+ c = sendcmd(1,0x100,0);
+
+ dma_wd.dma_mode_status = 0x180;
+ udelay(40);
+ acsi_wait_for_noIRQ(20);
+ return( c & 0x02);
+}
+
+
+/* Check for a network adaptor of this type, and return '0' if one exists.
+ */
+struct net_device * __init bionet_probe(int unit)
+{
+ struct net_device *dev;
+ unsigned char station_addr[6];
+ static unsigned version_printed;
+ static int no_more_found; /* avoid "Probing for..." printed 4 times */
+ int i;
+ int err;
+
+ if (!MACH_IS_ATARI || no_more_found)
+ return ERR_PTR(-ENODEV);
+
+ dev = alloc_etherdev(sizeof(struct net_local));
+ if (!dev)
+ return ERR_PTR(-ENOMEM);
+ if (unit >= 0) {
+ sprintf(dev->name, "eth%d", unit);
+ netdev_boot_setup_check(dev);
+ }
+ SET_MODULE_OWNER(dev);
+
+ printk("Probing for BioNet 100 Adapter...\n");
+
+ stdma_lock(bionet_intr, NULL);
+ i = get_status(station_addr); /* Read the station address PROM. */
+ ENABLE_IRQ();
+ stdma_release();
+
+ /* Check the first three octets of the S.A. for the manufactor's code.
+ */
+
+ if( i < 0
+ || station_addr[0] != 'B'
+ || station_addr[1] != 'I'
+ || station_addr[2] != 'O' ) {
+ no_more_found = 1;
+ printk( "No BioNet 100 found.\n" );
+ free_netdev(dev);
+ return ERR_PTR(-ENODEV);
+ }
+
+ if (bionet_debug > 0 && version_printed++ == 0)
+ printk(version);
+
+ printk("%s: %s found, eth-addr: %02x-%02x-%02x:%02x-%02x-%02x.\n",
+ dev->name, "BioNet 100",
+ station_addr[0], station_addr[1], station_addr[2],
+ station_addr[3], station_addr[4], station_addr[5]);
+
+ /* Initialize the device structure. */
+
+ nic_packet = (struct nic_pkt_s *)acsi_buffer;
+ phys_nic_packet = (unsigned char *)phys_acsi_buffer;
+ if (bionet_debug > 0) {
+ printk("nic_packet at 0x%p, phys at 0x%p\n",
+ nic_packet, phys_nic_packet );
+ }
+
+ dev->open = bionet_open;
+ dev->stop = bionet_close;
+ dev->hard_start_xmit = bionet_send_packet;
+ dev->get_stats = net_get_stats;
+
+ /* Fill in the fields of the device structure with ethernet-generic
+ * values. This should be in a common file instead of per-driver.
+ */
+
+ for (i = 0; i < ETH_ALEN; i++) {
+#if 0
+ dev->broadcast[i] = 0xff;
+#endif
+ dev->dev_addr[i] = station_addr[i];
+ }
+ err = register_netdev(dev);
+ if (!err)
+ return dev;
+ free_netdev(dev);
+ return ERR_PTR(err);
+}
+
+/* Open/initialize the board. This is called (in the current kernel)
+ sometime after booting when the 'ifconfig' program is run.
+
+ This routine should set everything up anew at each open, even
+ registers that "should" only need to be set once at boot, so that
+ there is non-reboot way to recover if something goes wrong.
+ */
+static int
+bionet_open(struct net_device *dev) {
+ struct net_local *lp = netdev_priv(dev);
+
+ if (bionet_debug > 0)
+ printk("bionet_open\n");
+ stdma_lock(bionet_intr, NULL);
+
+ /* Reset the hardware here.
+ */
+ set_status(4);
+ lp->open_time = 0; /*jiffies*/
+ lp->poll_time = MAX_POLL_TIME;
+
+ dev->tbusy = 0;
+ dev->interrupt = 0;
+ dev->start = 1;
+
+ stdma_release();
+ bionet_timer.data = (long)dev;
+ bionet_timer.expires = jiffies + lp->poll_time;
+ add_timer(&bionet_timer);
+ return 0;
+}
+
+static int
+bionet_send_packet(struct sk_buff *skb, struct net_device *dev) {
+ struct net_local *lp = netdev_priv(dev);
+ unsigned long flags;
+
+ /* Block a timer-based transmit from overlapping. This could better be
+ * done with atomic_swap(1, dev->tbusy), but set_bit() works as well.
+ */
+ local_irq_save(flags);
+
+ if (stdma_islocked()) {
+ local_irq_restore(flags);
+ lp->stats.tx_errors++;
+ }
+ else {
+ int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
+ unsigned long buf = virt_to_phys(skb->data);
+ int stat;
+
+ stdma_lock(bionet_intr, NULL);
+ local_irq_restore(flags);
+ if( !STRAM_ADDR(buf+length-1) ) {
+ memcpy(nic_packet->buffer, skb->data, length);
+ buf = (unsigned long)&((struct nic_pkt_s *)phys_nic_packet)->buffer;
+ }
+
+ if (bionet_debug >1) {
+ u_char *data = nic_packet->buffer, *p;
+ int i;
+
+ printk( "%s: TX pkt type 0x%4x from ", dev->name,
+ ((u_short *)data)[6]);
+
+ for( p = &data[6], i = 0; i < 6; i++ )
+ printk("%02x%s", *p++,i != 5 ? ":" : "" );
+ printk(" to ");
+
+ for( p = data, i = 0; i < 6; i++ )
+ printk("%02x%s", *p++,i != 5 ? ":" : "" "\n" );
+
+ printk( "%s: ", dev->name );
+ printk(" data %02x%02x %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x"
+ " %02x%02x%02x%02x len %d\n",
+ data[12], data[13], data[14], data[15], data[16], data[17], data[18], data[19],
+ data[20], data[21], data[22], data[23], data[24], data[25], data[26], data[27],
+ data[28], data[29], data[30], data[31], data[32], data[33],
+ length );
+ }
+ dma_cache_maintenance(buf, length, 1);
+
+ stat = hardware_send_packet(buf, length);
+ ENABLE_IRQ();
+ stdma_release();
+
+ dev->trans_start = jiffies;
+ dev->tbusy = 0;
+ lp->stats.tx_packets++;
+ lp->stats.tx_bytes+=length;
+ }
+ dev_kfree_skb(skb);
+
+ return 0;
+}
+
+/* We have a good packet(s), get it/them out of the buffers.
+ */
+static void
+bionet_poll_rx(struct net_device *dev) {
+ struct net_local *lp = netdev_priv(dev);
+ int boguscount = 10;
+ int pkt_len, status;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ /* ++roman: Take care at locking the ST-DMA... This must be done with ints
+ * off, since otherwise an int could slip in between the question and the
+ * locking itself, and then we'd go to sleep... And locking itself is
+ * necessary to keep the floppy_change timer from working with ST-DMA
+ * registers. */
+ if (stdma_islocked()) {
+ local_irq_restore(flags);
+ return;
+ }
+ stdma_lock(bionet_intr, NULL);
+ DISABLE_IRQ();
+ local_irq_restore(flags);
+
+ if( lp->poll_time < MAX_POLL_TIME ) lp->poll_time++;
+
+ while(boguscount--) {
+ status = get_frame((unsigned long)phys_nic_packet, 0);
+
+ if( status == 0 ) break;
+
+ /* Good packet... */
+
+ dma_cache_maintenance((unsigned long)phys_nic_packet, 1520, 0);
+
+ pkt_len = (nic_packet->l_hi << 8) | nic_packet->l_lo;
+
+ lp->poll_time = bionet_min_poll_time; /* fast poll */
+ if( pkt_len >= 60 && pkt_len <= 1520 ) {
+ /* ^^^^ war 1514 KHL */
+ /* Malloc up new buffer.
+ */
+ struct sk_buff *skb = dev_alloc_skb( pkt_len + 2 );
+ if (skb == NULL) {
+ printk("%s: Memory squeeze, dropping packet.\n",
+ dev->name);
+ lp->stats.rx_dropped++;
+ break;
+ }
+
+ skb->dev = dev;
+ skb_reserve( skb, 2 ); /* 16 Byte align */
+ skb_put( skb, pkt_len ); /* make room */
+
+ /* 'skb->data' points to the start of sk_buff data area.
+ */
+ memcpy(skb->data, nic_packet->buffer, pkt_len);
+ skb->protocol = eth_type_trans( skb, dev );
+ netif_rx(skb);
+ dev->last_rx = jiffies;
+ lp->stats.rx_packets++;
+ lp->stats.rx_bytes+=pkt_len;
+
+ /* If any worth-while packets have been received, dev_rint()
+ has done a mark_bh(INET_BH) for us and will work on them
+ when we get to the bottom-half routine.
+ */
+
+ if (bionet_debug >1) {
+ u_char *data = nic_packet->buffer, *p;
+ int i;
+
+ printk( "%s: RX pkt type 0x%4x from ", dev->name,
+ ((u_short *)data)[6]);
+
+
+ for( p = &data[6], i = 0; i < 6; i++ )
+ printk("%02x%s", *p++,i != 5 ? ":" : "" );
+ printk(" to ");
+ for( p = data, i = 0; i < 6; i++ )
+ printk("%02x%s", *p++,i != 5 ? ":" : "" "\n" );
+
+ printk( "%s: ", dev->name );
+ printk(" data %02x%02x %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x"
+ " %02x%02x%02x%02x len %d\n",
+ data[12], data[13], data[14], data[15], data[16], data[17], data[18], data[19],
+ data[20], data[21], data[22], data[23], data[24], data[25], data[26], data[27],
+ data[28], data[29], data[30], data[31], data[32], data[33],
+ pkt_len );
+ }
+ }
+ else {
+ printk(" Packet has wrong length: %04d bytes\n", pkt_len);
+ lp->stats.rx_errors++;
+ }
+ }
+ stdma_release();
+ ENABLE_IRQ();
+ return;
+}
+
+/* bionet_tick: called by bionet_timer. Reads packets from the adapter,
+ * passes them to the higher layers and restarts the timer.
+ */
+static void
+bionet_tick(unsigned long data) {
+ struct net_device *dev = (struct net_device *)data;
+ struct net_local *lp = netdev_priv(dev);
+
+ if( bionet_debug > 0 && (lp->open_time++ & 7) == 8 )
+ printk("bionet_tick: %ld\n", lp->open_time);
+
+ if( !stdma_islocked() ) bionet_poll_rx(dev);
+
+ bionet_timer.expires = jiffies + lp->poll_time;
+ add_timer(&bionet_timer);
+}
+
+/* The inverse routine to bionet_open().
+ */
+static int
+bionet_close(struct net_device *dev) {
+ struct net_local *lp = netdev_priv(dev);
+
+ if (bionet_debug > 0)
+ printk("bionet_close, open_time=%ld\n", lp->open_time);
+ del_timer(&bionet_timer);
+ stdma_lock(bionet_intr, NULL);
+
+ set_status(0);
+ lp->open_time = 0;
+
+ dev->tbusy = 1;
+ dev->start = 0;
+
+ stdma_release();
+ return 0;
+}
+
+/* Get the current statistics.
+ This may be called with the card open or closed.
+ */
+static struct net_device_stats *net_get_stats(struct net_device *dev)
+{
+ struct net_local *lp = netdev_priv(dev);
+ return &lp->stats;
+}
+
+
+#ifdef MODULE
+
+static struct net_device *bio_dev;
+
+int init_module(void)
+{
+ bio_dev = bionet_probe(-1);
+ if (IS_ERR(bio_dev))
+ return PTR_ERR(bio_dev);
+ return 0;
+}
+
+void cleanup_module(void)
+{
+ unregister_netdev(bio_dev);
+ free_netdev(bio_dev);
+}
+
+#endif /* MODULE */
+
+/* Local variables:
+ * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/include
+ -b m68k-linuxaout -Wall -Wstrict-prototypes -O2
+ -fomit-frame-pointer -pipe -DMODULE -I../../net/inet -c bionet.c"
+ * version-control: t
+ * kept-new-versions: 5
+ * tab-width: 8
+ * End:
+ */