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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* $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}