linux-old/arch/sparc/prom/palloc.c
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   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 */
  24char *
  25prom_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 */
  38void
  39prom_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}
  45
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