support.c

eCos操作系统源码

        zone->free--;        
    } else {
        zone->alloc_fails++;
    }
    log(LOG_MDEBUG, "zalloci from %s => %p\n", zone->name, p);
    return (void *)p;
}

void      
zfreei(vm_zone_t zone, void *item)
{
    elem *p = (elem *)item;

    log(LOG_MDEBUG, "zfreei to %s <= %p\n", zone->name, p);
    p->next = zone->pool;
    zone->pool = p;
    zone->free++;
    zone->alloc_frees++;
}

static void
cyg_kmem_init(void)
{
    unsigned char *p;
#ifdef CYGPKG_NET_DEBUG
    diag_printf("Network stack using %d bytes for misc space\n", NET_MEMPOOL_SIZE);
    diag_printf("                    %d bytes for mbufs\n", NET_MBUFS_SIZE);
    diag_printf("                    %d bytes for mbuf clusters\n", NET_CLUSTERS_SIZE);
#endif
    cyg_mempool_var_create(&net_mempool_area,
                           NET_MEMPOOL_SIZE,
                           &net_mem,
                           &net_mem_pool);
    // Align the mbufs on MSIZE boudaries so that dtom() can work.
    p = (unsigned char *)(((long)(&net_mbufs_area) + MSIZE - 1) & ~(MSIZE-1));
    cyg_mempool_fix_create(p,
                           ((&(net_mbufs_area[NET_MBUFS_SIZE])) - p) & ~(MSIZE-1),
                           MSIZE,
                           &net_mbufs,
                           &net_mbufs_pool);
    cyg_mempool_fix_create(&net_clusters_area,
                           NET_CLUSTERS_SIZE,
                           MCLBYTES,
                           &net_clusters,
                           &net_clusters_pool);
    mbutl = (struct mbuf *)&net_clusters_area;
    mclrefcnt = net_clusters_refcnt;
}

void cyg_kmem_print_stats( void )
{
    cyg_mempool_info info;
    struct vm_zone *zone;

    diag_printf( "Network stack mbuf stats:\n" );
    diag_printf( "   mbufs %d, clusters %d, free clusters %d\n",
                 mbstat.m_mbufs,	/* mbufs obtained from page pool */
                 mbstat.m_clusters,	/* clusters obtained from page pool */
                 /* mbstat.m_spare, */	/* spare field */
                 mbstat.m_clfree	/* free clusters */
        );
    diag_printf( "   Failed to get %d times\n"
                 "   Waited to get %d times\n"
                 "   Drained queues to get %d times\n",
                 mbstat.m_drops,	/* times failed to find space */
                 mbstat.m_wait, 	/* times waited for space */
                 mbstat.m_drain         /* times drained protocols for space */
                 /* mbstat.m_mtypes[256]; type specific mbuf allocations */
        );

    zone = vm_zones;
    while (zone) {
        diag_printf("VM zone '%s':\n", zone->name);
        diag_printf("  Total: %d, Free: %d, Allocs: %d, Frees: %d, Fails: %d\n",
                    zone->total, zone->free,
                    zone->alloc_tries, zone->alloc_frees, zone->alloc_fails);
        zone = zone->next;
    }

    cyg_mempool_var_get_info( net_mem, &info );
    diag_printf( "Misc mpool: total %7d, free %7d, max free block %d\n",
                 info.totalmem,
                 info.freemem,
                 info.maxfree
        );

    cyg_mempool_fix_get_info( net_mbufs, &info );
    diag_printf( "Mbufs pool: total %7d, free %7d, blocksize %4d\n",
                 info.totalmem,
                 info.freemem,
                 info.blocksize
        );


    cyg_mempool_fix_get_info( net_clusters, &info );
    diag_printf( "Clust pool: total %7d, free %7d, blocksize %4d\n",
                 info.totalmem,
                 info.freemem,
                 info.blocksize
        );
}

// This API is for our own automated network tests.  It's not in any header
// files because it's not at all supported.
int cyg_net_get_mem_stats( int which, cyg_mempool_info *p )
{
    CYG_CHECK_DATA_PTR( p, "Bad pointer to mempool_info" );
    CYG_ASSERT( 0 <= which, "Mempool selector underflow" );
    CYG_ASSERT( 2 >=which, "Mempool selector overflow" );
    
    if ( p )
        switch ( which ) {
        case 0:
            cyg_mempool_var_get_info( net_mem, p );
            break;
        case 1:
            cyg_mempool_fix_get_info( net_mbufs, p );
            break;
        case 2:
            cyg_mempool_fix_get_info( net_clusters, p );
            break;
        default:
            return 0;
        }
    return (int)p;
}

int
cyg_mtocl(u_long x)
{
    int res;
    res = (((u_long)(x) - (u_long)mbutl) >> MCLSHIFT);
    return res;
}

struct mbuf *
cyg_cltom(u_long x)
{
    struct mbuf *res;
    res = (struct mbuf *)((caddr_t)((u_long)mbutl + ((u_long)(x) << MCLSHIFT)));
    return res;
}

externC void 
net_memcpy(void *d, void *s, int n)
{
    START_STATS();
    memcpy(d, s, n);
    FINISH_STATS(stats_memcpy);
}

externC void 
net_memset(void *s, int v, int n)
{
    START_STATS();
    memset(s, v, n);
    FINISH_STATS(stats_memset);
}

// Rather than bring in the whole BSD 'random' code...
int
arc4random(void)
{
    cyg_uint32 res;
    static unsigned long seed = 0xDEADB00B;
    HAL_CLOCK_READ(&res);  // Not so bad... (but often 0..N where N is small)
    seed = ((seed & 0x007F00FF) << 7) ^
        ((seed & 0x0F80FF00) >> 8) ^ // be sure to stir those low bits
        (res << 13) ^ (res >> 9);    // using the clock too!
    return (int)seed;
}

void 
get_random_bytes(void *buf, size_t len)
{
    unsigned long ranbuf, *lp;
    lp = (unsigned long *)buf;
    while (len > 0) {
        ranbuf = arc4random();
        *lp++ = ranbuf;
        len -= sizeof(ranbuf);
    }
}

int
read_random_unlimited(void *buf, size_t len)
{
    get_random_bytes(buf, len);
    return len;
}

void read_random(void *buf, size_t len) 
{
    CYG_ASSERT(0 == (len & ~3), "Only multiple of words allowed");
  
    get_random_bytes(buf, len);
}

void 
microtime(struct timeval *tp)
{
    *tp = ktime;
    log(LOG_DEBUG, "%s: = %d.%d\n", __FUNCTION__, tp->tv_sec, tp->tv_usec);
    ktime.tv_usec++;  // In case clock isn't running yet
}

void 
getmicrotime(struct timeval *tp)
{
    *tp = ktime;
    log(LOG_DEBUG, "%s: = %d.%d\n", __FUNCTION__, tp->tv_sec, tp->tv_usec);
    ktime.tv_usec++;  // In case clock isn't running yet
}

void 
getmicrouptime(struct timeval *tp)
{
    *tp = ktime;
    log(LOG_DEBUG, "%s: = %d.%d\n", __FUNCTION__, tp->tv_sec, tp->tv_usec);
    ktime.tv_usec++;  // In case clock isn't running yet
}

// Taken from kern/kern_clock.c
/*
 * Compute number of ticks in the specified amount of time.
 */
#ifndef LONG_MAX
#define LONG_MAX 0x7FFFFFFF
#endif
int
tvtohz(struct timeval *tv)
{
        register unsigned long ticks;
        register long sec, usec;

        /*
         * If the number of usecs in the whole seconds part of the time
         * difference fits in a long, then the total number of usecs will
         * fit in an unsigned long.  Compute the total and convert it to
         * ticks, rounding up and adding 1 to allow for the current tick
         * to expire.  Rounding also depends on unsigned long arithmetic
         * to avoid overflow.
         *
         * Otherwise, if the number of ticks in the whole seconds part of
         * the time difference fits in a long, then convert the parts to
         * ticks separately and add, using similar rounding methods and
         * overflow avoidance.  This method would work in the previous
         * case but it is slightly slower and assumes that hz is integral.
         *
         * Otherwise, round the time difference down to the maximum
         * representable value.
         *
         * If ints have 32 bits, then the maximum value for any timeout in
         * 10ms ticks is 248 days.
         */
        sec = tv->tv_sec;
        usec = tv->tv_usec;
        if (usec < 0) {
                sec--;
                usec += 1000000;
        }
        if (sec < 0) {
#ifdef DIAGNOSTIC
                if (usec > 0) {
                        sec++;
                        usec -= 1000000;
                }
                printf("tvotohz: negative time difference %ld sec %ld usec\n",
                       sec, usec);
#endif
                ticks = 1;
        } else if (sec <= LONG_MAX / 1000000)
                ticks = (sec * 1000000 + (unsigned long)usec + (tick - 1))
                        / tick + 1;
        else if (sec <= LONG_MAX / hz)
                ticks = sec * hz
                        + ((unsigned long)usec + (tick - 1)) / tick + 1;
        else
                ticks = LONG_MAX;
        if (ticks > INT_MAX)
                ticks = INT_MAX;
        return ((int)ticks);
}

void
get_mono_time(void)
{
    panic("get_mono_time");
}

void 
csignal(pid_t pgid, int signum, uid_t uid, uid_t euid)
{
    panic("csignal");
}

int
bcmp(const void *_p1, const void *_p2, size_t len)
{
    int res = 0;
    unsigned char *p1 = (unsigned char *)_p1;
    unsigned char *p2 = (unsigned char *)_p2;
    while (len-- > 0) {
        res = *p1++ - *p2++;
        if (res) break;
    }
    return res;
}

int
copyout(const void *s, void *d, size_t len)
{
    memcpy(d, s, len);
    return 0;
}

int
copyin(const void *s, void *d, size_t len)
{
    memcpy(d, s, len);
    return 0;
}

void
ovbcopy(const void *s, void *d, size_t len)
{
    memmove(d, s, len);
}


// ------------------------------------------------------------------------
// THE NETWORK THREAD ITSELF
//
// Network software interrupt handler
//   This function is run as a separate thread to allow
// processing of network events (mostly incoming packets)
// at "user level" instead of at interrupt time.
//
// The actual handlers are 'registered' at system startup
//

// The set of handlers
static netisr_t *_netisr_handlers[NETISR_MAX+1];
struct ifqueue  ipintrq;
#ifdef INET6
struct ifqueue  ip6intrq;
#endif
char *hostname = "eCos_node";

// Register a 'netisr' handler for a given level
int 
register_netisr(int level, netisr_t *fun)
{
    CYG_ASSERT(level <= NETISR_MAX, "invalid netisr level");
    CYG_ASSERT(_netisr_handlers[level] == 0, "re-registered netisr");
    _netisr_handlers[level] = fun;
    return 0;  // ignored
}

//int unregister_netisr __P((int));