Changeset f6ef823a in rtems


Ignore:
Timestamp:
Nov 13, 2000, 10:58:36 PM (20 years ago)
Author:
Joel Sherrill <joel.sherrill@…>
Branches:
4.10, 4.11, 4.8, 4.9, 5, master
Children:
f5f54cfa
Parents:
a44f9ca5
Message:

2000-11-13 Jiri Gaisler <jgais@…>

  • network/sonic.c: Added ipalign() routine to align the received packet so that the ip header is on a 32-bit boundary. Necessary for cpu's that do not allow unaligned loads and stores and when the 32-bit DMA mode is used.
Location:
c/src/libchip
Files:
2 edited

Legend:

Unmodified
Added
Removed
  • c/src/libchip/ChangeLog

    ra44f9ca5 rf6ef823a  
     12000-11-13      Jiri Gaisler <jgais@ws.estec.esa.nl>
     2
     3        * network/sonic.c: Added ipalign() routine to align the
     4        received packet so that the ip header is on a 32-bit boundary.
     5        Necessary for cpu's that do not allow unaligned loads and stores
     6        and when the 32-bit DMA mode is used.
     7
    182000-11-09      Ralf Corsepius <corsepiu@faw.uni-ulm.de>
    29
  • c/src/libchip/network/sonic.c

    ra44f9ca5 rf6ef823a  
    887887
    888888}
     889
     890#ifdef CPU_U32_FIX
     891
     892/*
     893 * Routine to align the received packet so that the ip header
     894 * is on a 32-bit boundary. Necessary for cpu's that do not
     895 * allow unaligned loads and stores and when the 32-bit DMA
     896 * mode is used.
     897 *
     898 * Transfers are done on word basis to avoid possibly slow byte
     899 * and half-word writes.
     900 */
     901 
     902void ipalign(struct mbuf *m)
     903{
     904  unsigned int *first, *last, data;
     905  unsigned int tmp = 0;
     906
     907  if ((((int) m->m_data) & 2) && (m->m_len)) {
     908    last = (unsigned int *) ((((int) m->m_data) + m->m_len + 8) & ~3);
     909    first = (unsigned int *) (((int) m->m_data) & ~3);
     910    tmp = *first << 16;
     911    first++;
     912    do {
     913      data = *first;
     914      *first = tmp | (data >> 16);
     915      tmp = data << 16;
     916      first++;
     917    } while (first <= last);
     918
     919    m->m_data = (caddr_t)(((int) m->m_data) + 2);
     920  }
     921}
     922#endif
    889923
    890924/*
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