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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 (
#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.
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);