kernel/arch/i386/do_readbios.c

   1 /* The kernel call implemented in this file:
   2  *   m_type:    SYS_READBIOS
   3  *
   4  * The parameters for this kernel call are:
   5  *    m2_i1:    RDB_SIZE                number of bytes to copy
   6  *    m2_l1:    RDB_ADDR                absolute address in BIOS area
   7  *    m2_p1:    RDB_BUF                 buffer address in requesting process
   8  */
   9
  10 #include "kernel/system.h"
  11 #include <minix/type.h>
  12
  13 /*===========================================================================*
  14  *                              do_readbios                                  *
  15  *===========================================================================*/
  16 PUBLIC int do_readbios(struct proc * caller, message * m_ptr)
  17 {
  18   struct vir_addr src, dst;
  19
  20   src.segment = BIOS_SEG;
  21   dst.segment = D;
  22   src.offset = m_ptr->RDB_ADDR;
  23   dst.offset = (vir_bytes) m_ptr->RDB_BUF;
  24   src.proc_nr_e = NONE;
  25   dst.proc_nr_e = m_ptr->m_source;
  26
  27   return virtual_copy_vmcheck(caller, &src, &dst, m_ptr->RDB_SIZE);
  28 }