palloc.c
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- /* $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;
- }