arch/sparc/prom/palloc.c

   1 /* $Id: palloc.c,v 1.4 1996/04/25 06:09:48 davem Exp $
   2  * palloc.c:  Memory allocation from the Sun PROM.
   3  *
   4  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   5  */
   6
   7 #include <asm/openprom.h>
   8 #include <asm/oplib.h>
   9
  10 /* You should not call these routines after memory management
  11  * has been initialized in the kernel, if fact you should not
  12  * use these if at all possible in the kernel.  They are mainly
  13  * to be used for a bootloader for temporary allocations which
  14  * it will free before jumping into the kernel it has loaded.
  15  *
  16  * Also, these routines don't work on V0 proms, only V2 and later.
  17  */
  18
  19 /* Allocate a chunk of memory of size 'num_bytes' giving a suggestion
  20  * of virtual_hint as the preferred virtual base address of this chunk.
  21  * There are no guarantees that you will get the allocation, or that
  22  * the prom will abide by your "hint".  So check your return value.
  23  */
  24 char *
  25 prom_alloc(char *virtual_hint, unsigned int num_bytes)
  26 {
  27         if(prom_vers == PROM_V0) return (char *) 0x0;
  28         if(num_bytes == 0x0) return (char *) 0x0;
  29         return (*(romvec->pv_v2devops.v2_dumb_mem_alloc))(virtual_hint, num_bytes);
  30 }
  31
  32 /* Free a previously allocated chunk back to the prom at virtual address
  33  * 'vaddr' of size 'num_bytes'.  NOTE: This vaddr is not the hint you
  34  * used for the allocation, but the virtual address the prom actually
  35  * returned to you.  They may be have been the same, they may have not,
  36  * doesn't matter.
  37  */
  38 void
  39 prom_free(char *vaddr, unsigned int num_bytes)
  40 {
  41         if((prom_vers == PROM_V0) || (num_bytes == 0x0)) return;
  42         (*(romvec->pv_v2devops.v2_dumb_mem_free))(vaddr, num_bytes);
  43         return;
  44 }