| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |