| /* $Id: palloc.c,v 1.4 1996/04/25 06:09:48 davem Exp $ |
| * palloc.c: Memory allocation from the Sun PROM. |
| * |
| * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) |
| */ |
| |
| #include <asm/openprom.h> |
| #include <asm/oplib.h> |
| |
| /* You should not call these routines after memory management |
| * has been initialized in the kernel, if fact you should not |
| * use these if at all possible in the kernel. They are mainly |
| * to be used for a bootloader for temporary allocations which |
| * it will free before jumping into the kernel it has loaded. |
| * |
| * Also, these routines don't work on V0 proms, only V2 and later. |
| */ |
| |
| /* Allocate a chunk of memory of size 'num_bytes' giving a suggestion |
| * of virtual_hint as the preferred virtual base address of this chunk. |
| * There are no guarantees that you will get the allocation, or that |
| * the prom will abide by your "hint". So check your return value. |
| */ |
| char * |
| prom_alloc(char *virtual_hint, unsigned int num_bytes) |
| { |
| if(prom_vers == PROM_V0) return (char *) 0x0; |
| if(num_bytes == 0x0) return (char *) 0x0; |
| return (*(romvec->pv_v2devops.v2_dumb_mem_alloc))(virtual_hint, num_bytes); |
| } |
| |
| /* Free a previously allocated chunk back to the prom at virtual address |
| * 'vaddr' of size 'num_bytes'. NOTE: This vaddr is not the hint you |
| * used for the allocation, but the virtual address the prom actually |
| * returned to you. They may be have been the same, they may have not, |
| * doesn't matter. |
| */ |
| void |
| prom_free(char *vaddr, unsigned int num_bytes) |
| { |
| if((prom_vers == PROM_V0) || (num_bytes == 0x0)) return; |
| (*(romvec->pv_v2devops.v2_dumb_mem_free))(vaddr, num_bytes); |
| return; |
| } |