root/arch/sparc/prom/devmap.c

/* */

DEFINITIONS

1. prom_mapio
2. prom_unmapio

   1 /* promdevmap.c:  Map device/IO areas to virtual addresses.
   2  *
   3  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   4  */
   5 
   6 #include <asm/openprom.h>
   7 #include <asm/oplib.h>
   8 
   9 /* Just like the routines in palloc.c, these should not be used
  10  * by the kernel at all.  Bootloader facility mainly.  And again,
  11  * this is only available on V2 proms and above.
  12  */
  13 
  14 /* Map physical device address 'paddr' in IO space 'ios' of size
  15  * 'num_bytes' to a virtual address, with 'vhint' being a hint to
  16  * the prom as to where you would prefer the mapping.  We return
  17  * where the prom actually mapped it.
  18  */
  19 char *
  20 prom_mapio(char *vhint, int ios, unsigned int paddr, unsigned int num_bytes)
     /*  */
  21 {
  22         if((num_bytes == 0) || (paddr == 0)) return (char *) 0x0;
  23         return (*(romvec->pv_v2devops.v2_dumb_mmap))(vhint, ios, paddr,
  24                                                      num_bytes);
  25 }
  26 
  27 /* Unmap an IO/device area that was mapped using the above routine. */
  28 void
  29 prom_unmapio(char *vaddr, unsigned int num_bytes)
     /*  */
  30 {
  31         if(num_bytes == 0x0) return;
  32         (*(romvec->pv_v2devops.v2_dumb_munmap))(vaddr, num_bytes);
  33         return;
  34 }

/* */