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path: root/lib/lufa/Bootloaders/Printer/BootloaderAPI.c
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/*
             LUFA Library
     Copyright (C) Dean Camera, 2017.

  dean [at] fourwalledcubicle [dot] com
           www.lufa-lib.org
*/

/*
  Copyright 2017  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, distribute, and sell this
  software and its documentation for any purpose is hereby granted
  without fee, provided that the above copyright notice appear in
  all copies and that both that the copyright notice and this
  permission notice and warranty disclaimer appear in supporting
  documentation, and that the name of the author not be used in
  advertising or publicity pertaining to distribution of the
  software without specific, written prior permission.

  The author disclaims all warranties with regard to this
  software, including all implied warranties of merchantability
  and fitness.  In no event shall the author be liable for any
  special, indirect or consequential damages or any damages
  whatsoever resulting from loss of use, data or profits, whether
  in an action of contract, negligence or other tortious action,
  arising out of or in connection with the use or performance of
  this software.
*/

/** \file
 *
 *  Bootloader user application API functions.
 */

#include "BootloaderAPI.h"

void BootloaderAPI_ErasePage(const uint32_t Address)
{
	boot_page_erase_safe(Address);
	boot_spm_busy_wait();
	boot_rww_enable();
}

void BootloaderAPI_WritePage(const uint32_t Address)
{
	boot_page_write_safe(Address);
	boot_spm_busy_wait();
	boot_rww_enable();
}

void BootloaderAPI_FillWord(const uint32_t Address, const uint16_t Word)
{
	boot_page_fill_safe(Address, Word);
}

uint8_t BootloaderAPI_ReadSignature(const uint16_t Address)
{
	return boot_signature_byte_get(Address);
}

uint8_t BootloaderAPI_ReadFuse(const uint16_t Address)
{
	return boot_lock_fuse_bits_get(Address);
}

uint8_t BootloaderAPI_ReadLock(void)
{
	return boot_lock_fuse_bits_get(GET_LOCK_BITS);
}

void BootloaderAPI_WriteLock(const uint8_t LockBits)
{
	boot_lock_bits_set_safe(LockBits);
}
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/* Minimal network driver for Mini-OS. 
 * Copyright (c) 2006-2007 Jacob Gorm Hansen, University of Copenhagen.
 * Based on netfront.c from Xen Linux.
 *
 * Does not handle fragments or extras.
 */

#include <os.h>
#include <xenbus.h>
#include <events.h>
#include <errno.h>
#include <xen/io/netif.h>
#include <gnttab.h>
#include <xmalloc.h>
#include <time.h>
#include <netfront.h>
#include <lib.h>
#include <semaphore.h>

DECLARE_WAIT_QUEUE_HEAD(netfront_queue);

#ifdef HAVE_LIBC
#define NETIF_SELECT_RX ((void*)-1)
#endif



#define NET_TX_RING_SIZE __RING_SIZE((struct netif_tx_sring *)0, PAGE_SIZE)
#define NET_RX_RING_SIZE __RING_SIZE((struct netif_rx_sring *)0, PAGE_SIZE)
#define GRANT_INVALID_REF 0


struct net_buffer {
    void* page;
    grant_ref_t gref;
};

struct netfront_dev {
    domid_t dom;

    unsigned short tx_freelist[NET_TX_RING_SIZE + 1];
    struct semaphore tx_sem;

    struct net_buffer rx_buffers[NET_RX_RING_SIZE];
    struct net_buffer tx_buffers[NET_TX_RING_SIZE];

    struct netif_tx_front_ring tx;
    struct netif_rx_front_ring rx;
    grant_ref_t tx_ring_ref;
    grant_ref_t rx_ring_ref;
    evtchn_port_t evtchn;

    char *nodename;
    char *backend;
    char *mac;

    xenbus_event_queue events;

#ifdef HAVE_LIBC
    int fd;
    unsigned char *data;
    size_t len;
    size_t rlen;
#endif

    void (*netif_rx)(unsigned char* data, int len);
};

void init_rx_buffers(struct netfront_dev *dev);

static inline void add_id_to_freelist(unsigned int id,unsigned short* freelist)
{
    freelist[id + 1] = freelist[0];
    freelist[0]  = id;
}

static inline unsigned short get_id_from_freelist(unsigned short* freelist)
{
    unsigned int id = freelist[0];
    freelist[0] = freelist[id + 1];
    return id;
}

__attribute__((weak)) void netif_rx(unsigned char* data,int len)
{
    printk("%d bytes incoming at %p\n",len,data);
}

__attribute__((weak)) void net_app_main(void*si,unsigned char*mac) {}

static inline int xennet_rxidx(RING_IDX idx)
{
    return idx & (NET_RX_RING_SIZE - 1);
}

void network_rx(struct netfront_dev *dev)
{
    RING_IDX rp,cons,req_prod;
    struct netif_rx_response *rx;
    int nr_consumed, some, more, i, notify;


moretodo:
    rp = dev->rx.sring->rsp_prod;
    rmb(); /* Ensure we see queued responses up to 'rp'. */
    cons = dev->rx.rsp_cons;

    nr_consumed = 0;
    some = 0;
    while ((cons != rp) && !some)
    {
        struct net_buffer* buf;
        unsigned char* page;
        int id;

        rx = RING_GET_RESPONSE(&dev->rx, cons);

        if (rx->flags & NETRXF_extra_info)
        {
            printk("+++++++++++++++++++++ we have extras!\n");
            continue;
        }


        if (rx->status == NETIF_RSP_NULL) continue;

        id = rx->id;
        BUG_ON(id >= NET_TX_RING_SIZE);

        buf = &dev->rx_buffers[id];
        page = (unsigned char*)buf->page;
        gnttab_end_access(buf->gref);

        if(rx->status>0)
        {
#ifdef HAVE_LIBC
	    if (dev->netif_rx == NETIF_SELECT_RX) {
		int len = rx->status;
		ASSERT(current == main_thread);
		if (len > dev->len)
		    len = dev->len;
		memcpy(dev->data, page+rx->offset, len);
		dev->rlen = len;
		some = 1;
	    } else
#endif
		dev->netif_rx(page+rx->offset,rx->status);
        }

        nr_consumed++;

        ++cons;
    }
    dev->rx.rsp_cons=cons;

    RING_FINAL_CHECK_FOR_RESPONSES(&dev->rx,more);
    if(more && !some) goto moretodo;

    req_prod = dev->rx.req_prod_pvt;

    for(i=0; i<nr_consumed; i++)
    {
        int id = xennet_rxidx(req_prod + i);
        netif_rx_request_t *req = RING_GET_REQUEST(&dev->rx, req_prod + i);
        struct net_buffer* buf = &dev->rx_buffers[id];
        void* page = buf->page;

        /* We are sure to have free gnttab entries since they got released above */
        buf->gref = req->gref = 
            gnttab_grant_access(dev->dom,virt_to_mfn(page),0);

        req->id = id;
    }

    wmb();

    dev->rx.req_prod_pvt = req_prod + i;
    
    RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&dev->rx, notify);
    if (notify)
        notify_remote_via_evtchn(dev->evtchn);

}

void network_tx_buf_gc(struct netfront_dev *dev)
{


    RING_IDX cons, prod;
    unsigned short id;

    do {
        prod = dev->tx.sring->rsp_prod;
        rmb(); /* Ensure we see responses up to 'rp'. */

        for (cons = dev->tx.rsp_cons; cons != prod; cons++) 
        {
            struct netif_tx_response *txrsp;
            struct net_buffer *buf;

            txrsp = RING_GET_RESPONSE(&dev->tx, cons);
            if (txrsp->status == NETIF_RSP_NULL)
                continue;

            if (txrsp->status == NETIF_RSP_ERROR)
                printk("packet error\n");

            id  = txrsp->id;
            BUG_ON(id >= NET_TX_RING_SIZE);
            buf = &dev->tx_buffers[id];
            gnttab_end_access(buf->gref);
            buf->gref=GRANT_INVALID_REF;

	    add_id_to_freelist(id,dev->tx_freelist);
	    up(&dev->tx_sem);
        }

        dev->tx.rsp_cons = prod;

        /*
         * Set a new event, then check for race with update of tx_cons.
         * Note that it is essential to schedule a callback, no matter
         * how few tx_buffers are pending. Even if there is space in the
         * transmit ring, higher layers may be blocked because too much
         * data is outstanding: in such cases notification from Xen is
         * likely to be the only kick that we'll get.
         */
        dev->tx.sring->rsp_event =
            prod + ((dev->tx.sring->req_prod - prod) >> 1) + 1;
        mb();
    } while ((cons == prod) && (prod != dev->tx.sring->rsp_prod));


}

void netfront_handler(evtchn_port_t port, struct pt_regs *regs, void *data)
{
    int flags;
    struct netfront_dev *dev = data;

    local_irq_save(flags);

    network_tx_buf_gc(dev);
    network_rx(dev);

    local_irq_restore(flags);
}

#ifdef HAVE_LIBC
void netfront_select_handler(evtchn_port_t port, struct pt_regs *regs, void *data)
{
    int flags;
    struct netfront_dev *dev = data;
    int fd = dev->fd;

    local_irq_save(flags);
    network_tx_buf_gc(dev);
    local_irq_restore(flags);

    if (fd != -1)
        files[fd].read = 1;
    wake_up(&netfront_queue);
}
#endif

static void free_netfront(struct netfront_dev *dev)
{
    int i;

    for(i=0;i<NET_TX_RING_SIZE;i++)
	down(&dev->tx_sem);

    mask_evtchn(dev->evtchn);

    free(dev->mac);
    free(dev->backend);

    gnttab_end_access(dev->rx_ring_ref);
    gnttab_end_access(dev->tx_ring_ref);

    free_page(dev->rx.sring);
    free_page(dev->tx.sring);

    unbind_evtchn(dev->evtchn);

    for(i=0;i<NET_RX_RING_SIZE;i++) {
	gnttab_end_access(dev->rx_buffers[i].gref);
	free_page(dev->rx_buffers[i].page);
    }

    for(i=0;i<NET_TX_RING_SIZE;i++)
	if (dev->tx_buffers[i].page)
	    free_page(dev->tx_buffers[i].page);

    free(dev->nodename);
    free(dev);
}

struct netfront_dev *init_netfront(char *_nodename, void (*thenetif_rx)(unsigned char* data, int len), unsigned char rawmac[6], char **ip)
{
    xenbus_transaction_t xbt;
    char* err;
    char* message=NULL;
    struct netif_tx_sring *txs;
    struct netif_rx_sring *rxs;
    int retry=0;
    int i;
    char* msg;
    char* nodename = _nodename ? _nodename : "device/vif/0";

    struct netfront_dev *dev;

    char path[strlen(nodename) + 1 + 10 + 1];

    if (!thenetif_rx)
	thenetif_rx = netif_rx;

    printk("************************ NETFRONT for %s **********\n\n\n", nodename);

    dev = malloc(sizeof(*dev));
    memset(dev, 0, sizeof(*dev));
    dev->nodename = strdup(nodename);
#ifdef HAVE_LIBC
    dev->fd = -1;
#endif

    printk("net TX ring size %d\n", NET_TX_RING_SIZE);
    printk("net RX ring size %d\n", NET_RX_RING_SIZE);
    init_SEMAPHORE(&dev->tx_sem, NET_TX_RING_SIZE);
    for(i=0;i<NET_TX_RING_SIZE;i++)
    {
	add_id_to_freelist(i,dev->tx_freelist);
        dev->tx_buffers[i].page = NULL;
    }

    for(i=0;i<NET_RX_RING_SIZE;i++)
    {
	/* TODO: that's a lot of memory */
        dev->rx_buffers[i].page = (char*)alloc_page();
    }

    snprintf(path, sizeof(path), "%s/backend-id", nodename);
    dev->dom = xenbus_read_integer(path);
#ifdef HAVE_LIBC
    if (thenetif_rx == NETIF_SELECT_RX)
        evtchn_alloc_unbound(dev->dom, netfront_select_handler, dev, &dev->evtchn);
    else
#endif
        evtchn_alloc_unbound(dev->dom, netfront_handler, dev, &dev->evtchn);

    txs = (struct netif_tx_sring *) alloc_page();
    rxs = (struct netif_rx_sring *) alloc_page();
    memset(txs,0,PAGE_SIZE);
    memset(rxs,0,PAGE_SIZE);


    SHARED_RING_INIT(txs);
    SHARED_RING_INIT(rxs);
    FRONT_RING_INIT(&dev->tx, txs, PAGE_SIZE);
    FRONT_RING_INIT(&dev->rx, rxs, PAGE_SIZE);

    dev->tx_ring_ref = gnttab_grant_access(dev->dom,virt_to_mfn(txs),0);
    dev->rx_ring_ref = gnttab_grant_access(dev->dom,virt_to_mfn(rxs),0);

    init_rx_buffers(dev);

    dev->netif_rx = thenetif_rx;

    dev->events = NULL;

again:
    err = xenbus_transaction_start(&xbt);
    if (err) {
        printk("starting transaction\n");
    }

    err = xenbus_printf(xbt, nodename, "tx-ring-ref","%u",
                dev->tx_ring_ref);
    if (err) {
        message = "writing tx ring-ref";
        goto abort_transaction;
    }
    err = xenbus_printf(xbt, nodename, "rx-ring-ref","%u",
                dev->rx_ring_ref);
    if (err) {
        message = "writing rx ring-ref";
        goto abort_transaction;
    }
    err = xenbus_printf(xbt, nodename,
                "event-channel", "%u", dev->evtchn);
    if (err) {
        message = "writing event-channel";
        goto abort_transaction;
    }

    err = xenbus_printf(xbt, nodename, "request-rx-copy", "%u", 1);

    if (err) {
        message = "writing request-rx-copy";
        goto abort_transaction;
    }

    err = xenbus_printf(xbt, nodename, "state", "%u",
            4); /* connected */


    err = xenbus_transaction_end(xbt, 0, &retry);
    if (retry) {
            goto again;
        printk("completing transaction\n");
    }

    goto done;

abort_transaction:
    xenbus_transaction_end(xbt, 1, &retry);
    goto error;

done:

    snprintf(path, sizeof(path), "%s/backend", nodename);
    msg = xenbus_read(XBT_NIL, path, &dev->backend);
    snprintf(path, sizeof(path), "%s/mac", nodename);
    msg = xenbus_read(XBT_NIL, path, &dev->mac);

    if ((dev->backend == NULL) || (dev->mac == NULL)) {
        printk("%s: backend/mac failed\n", __func__);
        goto error;
    }

    printk("backend at %s\n",dev->backend);
    printk("mac is %s\n",dev->mac);

    {
        char path[strlen(dev->backend) + 1 + 5 + 1];
        snprintf(path, sizeof(path), "%s/state", dev->backend);

        xenbus_watch_path_token(XBT_NIL, path, path, &dev->events);

        xenbus_wait_for_value(path, "4", &dev->events);

        if (ip) {
            snprintf(path, sizeof(path), "%s/ip", dev->backend);
            xenbus_read(XBT_NIL, path, ip);
        }
    }

    printk("**************************\n");

    unmask_evtchn(dev->evtchn);

        /* Special conversion specifier 'hh' needed for __ia64__. Without
           this mini-os panics with 'Unaligned reference'. */
    if (rawmac)
	sscanf(dev->mac,"%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
            &rawmac[0],
            &rawmac[1],
            &rawmac[2],
            &rawmac[3],
            &rawmac[4],
            &rawmac[5]);

    return dev;
error:
    free_netfront(dev);
    return NULL;
}

#ifdef HAVE_LIBC
int netfront_tap_open(char *nodename) {
    struct netfront_dev *dev;

    dev = init_netfront(nodename, NETIF_SELECT_RX, NULL, NULL);
    if (!dev) {
	printk("TAP open failed\n");
	errno = EIO;
	return -1;
    }
    dev->fd = alloc_fd(FTYPE_TAP);
    printk("tap_open(%s) -> %d\n", nodename, dev->fd);
    files[dev->fd].tap.dev = dev;
    return dev->fd;
}
#endif

void shutdown_netfront(struct netfront_dev *dev)
{
    char* err;
    char *nodename = dev->nodename;

    char path[strlen(dev->backend) + 1 + 5 + 1];

    printk("close network: backend at %s\n",dev->backend);

    snprintf(path, sizeof(path), "%s/state", dev->backend);

    err = xenbus_printf(XBT_NIL, nodename, "state", "%u", 5); /* closing */
    xenbus_wait_for_value(path, "5", &dev->events);

    err = xenbus_printf(XBT_NIL, nodename, "state", "%u", 6);
    xenbus_wait_for_value(path, "6", &dev->events);

    err = xenbus_printf(XBT_NIL, nodename, "state", "%u", 1);
    xenbus_wait_for_value(path, "2", &dev->events);

    xenbus_unwatch_path(XBT_NIL, path);

    snprintf(path, sizeof(path), "%s/tx-ring-ref", nodename);
    xenbus_rm(XBT_NIL, path);
    snprintf(path, sizeof(path), "%s/rx-ring-ref", nodename);
    xenbus_rm(XBT_NIL, path);
    snprintf(path, sizeof(path), "%s/event-channel", nodename);
    xenbus_rm(XBT_NIL, path);
    snprintf(path, sizeof(path), "%s/request-rx-copy", nodename);
    xenbus_rm(XBT_NIL, path);

    free_netfront(dev);
}


void init_rx_buffers(struct netfront_dev *dev)
{
    int i, requeue_idx;
    netif_rx_request_t *req;
    int notify;

    /* Rebuild the RX buffer freelist and the RX ring itself. */
    for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) 
    {
        struct net_buffer* buf = &dev->rx_buffers[requeue_idx];
        req = RING_GET_REQUEST(&dev->rx, requeue_idx);

        buf->gref = req->gref = 
            gnttab_grant_access(dev->dom,virt_to_mfn(buf->page),0);

        req->id = requeue_idx;

        requeue_idx++;
    }

    dev->rx.req_prod_pvt = requeue_idx;

    RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&dev->rx, notify);

    if (notify) 
        notify_remote_via_evtchn(dev->evtchn);

    dev->rx.sring->rsp_event = dev->rx.rsp_cons + 1;
}


void netfront_xmit(struct netfront_dev *dev, unsigned char* data,int len)
{
    int flags;
    struct netif_tx_request *tx;
    RING_IDX i;
    int notify;
    unsigned short id;
    struct net_buffer* buf;
    void* page;

    BUG_ON(len > PAGE_SIZE);

    down(&dev->tx_sem);

    local_irq_save(flags);
    id = get_id_from_freelist(dev->tx_freelist);
    local_irq_restore(flags);

    buf = &dev->tx_buffers[id];
    page = buf->page;
    if (!page)
	page = buf->page = (char*) alloc_page();

    i = dev->tx.req_prod_pvt;
    tx = RING_GET_REQUEST(&dev->tx, i);

    memcpy(page,data,len);

    buf->gref = 
        tx->gref = gnttab_grant_access(dev->dom,virt_to_mfn(page),1);

    tx->offset=0;
    tx->size = len;
    tx->flags=0;
    tx->id = id;
    dev->tx.req_prod_pvt = i + 1;

    wmb();

    RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&dev->tx, notify);

    if(notify) notify_remote_via_evtchn(dev->evtchn);

    local_irq_save(flags);
    network_tx_buf_gc(dev);
    local_irq_restore(flags);
}

#ifdef HAVE_LIBC
ssize_t netfront_receive(struct netfront_dev *dev, unsigned char *data, size_t len)
{
    unsigned long flags;
    int fd = dev->fd;
    ASSERT(current == main_thread);

    dev->rlen = 0;
    dev->data = data;
    dev->len = len;

    local_irq_save(flags);
    network_rx(dev);
    if (!dev->rlen && fd != -1)
	/* No data for us, make select stop returning */
	files[fd].read = 0;
    /* Before re-enabling the interrupts, in case a packet just arrived in the
     * meanwhile. */
    local_irq_restore(flags);

    dev->data = NULL;
    dev->len = 0;

    return dev->rlen;
}
#endif