do_sdevio.c

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    1 /* The kernel call implemented in this file:
    2  *   m_type:    SYS_SDEVIO
    3  *
    4  * The parameters for this kernel call are:
    5  *    m2_i3:    DIO_REQUEST     (request input or output)       
    6  *    m2_i1:    DIO_TYPE        (flag indicating byte, word, or long)
    7  *    m2_l1:    DIO_PORT        (port to read/ write)   
    8  *    m2_p1:    DIO_VEC_ADDR    (virtual address of buffer)     
    9  *    m2_l2:    DIO_VEC_SIZE    (number of elements)    
   10  *    m2_i2:    DIO_VEC_PROC    (process where buffer is)       
   11  */
   12 
   13 #include "../system.h"
   14 #include <minix/devio.h>
   15 
   16 #if USE_SDEVIO
   17 
   18 /*===========================================================================*
   19  *                              do_sdevio                                    *
   20  *===========================================================================*/
   21 PUBLIC int do_sdevio(m_ptr)
   22 register message *m_ptr;        /* pointer to request message */
   23 {
   24   int proc_nr = m_ptr->DIO_VEC_PROC;
   25   int count = m_ptr->DIO_VEC_SIZE;
   26   long port = m_ptr->DIO_PORT;
   27   phys_bytes phys_buf;
   28 
   29   /* Check if process number is OK. A process number is allowed here, because
   30    * driver may directly provide a pointer to a buffer at the user-process
   31    * that initiated the device I/O. Kernel processes, of course, are denied.
   32    */
   33   if (proc_nr == SELF) proc_nr = m_ptr->m_source;
   34   if (! isokprocn(proc_nr)) return(EINVAL);
   35   if (iskerneln(proc_nr)) return(EPERM);
   36 
   37   /* Get and check physical address. */
   38   if ((phys_buf = numap_local(proc_nr, (vir_bytes) m_ptr->DIO_VEC_ADDR, count)) == 0)
   39       return(EFAULT);
   40 
   41   /* Perform device I/O for bytes and words. Longs are not supported. */
   42   if (m_ptr->DIO_REQUEST == DIO_INPUT) { 
   43       switch (m_ptr->DIO_TYPE) {
   44       case DIO_BYTE: phys_insb(port, phys_buf, count); break; 
   45       case DIO_WORD: phys_insw(port, phys_buf, count); break; 
   46       default: return(EINVAL);
   47       } 
   48   } else if (m_ptr->DIO_REQUEST == DIO_OUTPUT) { 
   49       switch (m_ptr->DIO_TYPE) {
   50       case DIO_BYTE: phys_outsb(port, phys_buf, count); break; 
   51       case DIO_WORD: phys_outsw(port, phys_buf, count); break; 
   52       default: return(EINVAL);
   53       } 
   54   }
   55   else {
   56       return(EINVAL);
   57   }
   58   return(OK);
   59 }
   60 
   61 #endif /* USE_SDEVIO */
   62

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FreeBSD/Linux Kernel Cross Reference sys/kernel/system/do_sdevio.c

FreeBSD/Linux Kernel Cross Reference
sys/kernel/system/do_sdevio.c