kernel/system/do_mapdma.c

   1 /* The kernel call implemented in this file:
   2  *   m_type:    SYS_MAPDMA
   3  *
   4  * The parameters for this kernel call are:
   5  *    m5_l1:    CP_SRC_ADDR     (virtual address)
   6  *    m5_l3:    CP_NR_BYTES     (size of datastructure)
   7  */
   8
   9 #include "../system.h"
  10
  11 /*==========================================================================*
  12  *                              do_mapdma                                   *
  13  *==========================================================================*/
  14 PUBLIC int do_mapdma(m_ptr)
  15 register message *m_ptr;        /* pointer to request message */
  16 {
  17         int r;
  18         endpoint_t proc_e;
  19         int proc_p;
  20         vir_bytes base, size;
  21         phys_bytes phys_base;
  22         struct proc *proc;
  23         message m;
  24
  25         proc_e = m_ptr->CP_SRC_ENDPT;
  26         base= m_ptr->CP_SRC_ADDR;
  27         size= m_ptr->CP_NR_BYTES;
  28
  29         if (!isokendpt(proc_e, &proc_p))
  30                 return(EINVAL);
  31
  32         proc = proc_addr(proc_p);
  33
  34         phys_base= umap_local(proc, D, base, size);
  35         if (!phys_base)
  36         {
  37                 kprintf("do_mapdma: umap_local failed\n");
  38                 return EFAULT;
  39         }
  40
  41         m_ptr->CP_DST_ADDR = phys_base;
  42         return OK;
  43 }
  44